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47results about How to "Control mechanical strength" patented technology
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Preparation of porous sericin sponge material
Preparation of sponge-like porous materials of silk protein is carried out by converting its conformation with denaturant at low temperature to have frozen phase separation to obtain the product. Its parameters can be regulated by controlling concentration of the silk protein, amount of denaturant or its characteristics, freezing time or post-treatment in porosity, pore size, and mechanical performance. Neither cross-linker nor pore-generating agent nor surfactant nor organic solvent with strong toxicity is used. It is produced in a simple process, and has a uniform texture, high porosity up to 98%, good toughness and elasticity and reliability, water absorbing rate up to 5000%, elastic recovery rate 100% and press deformation >90%.
Owner:FUDAN UNIV
Micro-capsule essence with two-layer capsule wall and preparation method and application thereof
ActiveCN101649254AWell mixedHigh mechanical strengthFibre treatmentEssential-oils/perfumesEngineeringTwo layer
The invention discloses a micro-capsule essence with two-layer capsule walls and a preparation method and an application thereof. The essence comprises inner oil essence, a first micro-capsule wall inthe middle and an outer capsule wall located on outermost layer. The micro-capsule essence with two-layer capsule wall of the invention has two-layer capsule wall structure , good mechanical strengthand flexibitity; in addition, when used in cloth the micro-capsule essence has the advantage of strong washing resistance, long fragrance holding time and easy storage. The preparation method of themicro-capsule essence with two-layer capsule walls adopts complex coacervation phase separation method to prepare the essence, the technological design is seasonable, the maneuverability is strong, micro-capsule essence with different fragrances can be designed according to different demands; in the preparation process, the mechanical strength of the micro-capsule essence can be effectively controlled so as to control the duration time and degree of the frangrance of the micro-capsule essence; in addition, the finished product of the micro-capsule essence with two-layer capsule walls preparedin the invention has high qualification rate and the micro-capsule essence with two-layer capsule can realize industrialized production.
Owner:澳华达香精(广州)有限公司
Preparation of porous sericin sponge material
Preparation of sponge-like porous materials of silk protein is carried out by converting its conformation with denaturant at low temperature to have frozen phase separation to obtain the product. Its parameters can be regulated by controlling concentration of the silk protein, amount of denaturant or its characteristics, freezing time or post-treatment in porosity, pore size, and mechanical performance. Neither cross-linker nor pore-generating agent nor surfactant nor organic solvent with strong toxicity is used. It is produced in a simple process, and has a uniform texture, high porosity up to 98%, good toughness and elasticity and reliability, water absorbing rate up to 5000%, elastic recovery rate 100% and press deformation >90%.
Owner:FUDAN UNIV
Method for preparing soft magnetic composite material through hot pressing
InactiveCN103862048AEasy and efficient to prepareControl mechanical strengthInorganic material magnetismInductances/transformers/magnets manufactureEpoxyDispersed media
A method for preparing a soft magnetic composite material through hot pressing includes the following steps: dispersing particle soft magnetic powder into a dispersing medium, adding a coupling agent to conduct surface processing, conducting separation to obtain magnetic powder wrapping the coupling agent, conducting washing and drying through absolute ethyl alcohol to obtain the coupling agent modified magnetic powder, mixing the epoxy resin and an epoxy hardener to obtain an epoxy resin system mixture, mixing the coupling agent modified magnetic powder and the epoxy resin system mixture according to the proportion to obtain mixed slurry containing the magnetic powder and the epoxy resin system mixture, pouring the mixed slurry into a container, conducting vacuumizing, arranging the container into a constant temperature oven to conduct procuring to obtain composite slurry obtained through procuring, transferring the procured composite slurry into a mould, and conducting solidification and die pressing through a hog pressing machine to obtain the soft magnetic composite material. The method is simple in process, low in cost, favorable for operation and capable of achieving good magnetic performance and dynamic strength of the composite material by adjusting the content of the magnetic powder. The shape is controllable, and the mechanical performance is good.
Owner:TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
Sodium alginate-chitosan poly-ion composite hydrogel and preparation method thereof
The invention discloses sodium alginate-chitosan poly-ion composite hydrogel and a preparation method thereof. By means of the preparation method, the concentration of a sodium alginate-chitosan poly-ion composite solution is greatly increased, the number of ion pairs capable of reacting is increased, accordingly, the mechanical strength of the hydrogel is improved, it is achieved that the preparation process of the hydrogel is controllable, and the hydrogel in different shapes can be prepared by designing the shapes of molds according to the actual needs. The preparation method is mild in condition, chemical substances, such as a cross-linking agent and a photoinitiator are not needed, the mechanical strength of the sodium alginate-chitosan poly-ion composite hydrogel prepared by using the method can reach 1.8 MPa, and the sodium alginate-chitosan poly-ion composite hydrogel has a good application prospect.
Owner:SOUTH CHINA UNIV OF TECH
Shape memory material based on polylactic acid, manufacturing and using process thereof
InactiveCN101319088AOvercome the disadvantage of brittlenessControl performanceCrystallinityDraw ratio
The invention provides a shape memory material on the basis of polylactic acid and a preparation method thereof. The shape memory material is characterized by consisting of the polylactic acid and hyper branched polyesteramide, wherein, the weight portion of the polylactic acid is between 80 and 98 portions and the weight portion of the hyper branched polyesteramide is between 2 and 20 portions. The shape memory material has the advantage that various performances of a product such as the mechanical intensity, the breaking elongation and the degree of crystallinity can be controlled by changing the ratio of the hyper branched polyesteramide to the polylactic acid and mixing the two. The general polylactic acid material is easy to rupture when subject to a stretching or bending stress. The polylactic acid material overcomes the shortcoming of brittleness of the pure polylactic acid and has high toughness and elongation at break. Therefore, the polylactic acid material does not break at a high draw ratio, can restore to the prior shape by being heated and has good shape memory effect.
Owner:DONGHUA UNIV
Preparation method of high-strength polyvinyl alcohol-graphene oxide-polypyrrole composite hydrogel
InactiveCN110105592AImprove mechanical propertiesGood electrical propertiesPolypyrrolePolyvinyl alcohol
The invention discloses a preparation method of high-strength polyvinyl alcohol-graphene oxide-polypyrrole composite hydrogel. The preparation method comprises the following specific steps that firstly, polyvinyl alcohol is added into deionized water, heated at 90-100 DEG C and stirred to be dissolved, and a polyvinyl alcohol aqueous solution is obtained and naturally cooled to room temperature; then, the aqueous solution is kept stirring, a graphene oxide aqueous solution is added at 0-5 DEG C, then polypyrrole monomers are slowly added, an ammonium persulfate solution is added dropwise, andstirring continues; the mixture is poured into a mold, taken out after being frozen, and placed at room temperature for unfreezing, wherein freezing and unfreezing are repeated 4-7 times; finally, thehigh-strength polyvinyl alcohol-graphene oxide-polypyrrole composite hydrogel is obtained. The high-strength polyvinyl alcohol-graphene oxide-polypyrrole composite hydrogel has excellent mechanical strength, the preparation method of the high-strength polyvinyl alcohol-graphene oxide-polypyrrole composite hydrogel is simple, complex equipment is not needed, an organic solvent is not needed, and no pollution is caused to the environment.
Owner:WUHAN INSTITUTE OF TECHNOLOGY
Controlled release coating material containing polymer micro nanoparticles
ActiveCN103435424AUnique Water Solubility PropertiesUniform particle sizeFertilizer mixturesPorosityChemical structure
The invention provides a controlled release coating material containing polymer micro nanoparticles. The controlled release coating material comprises the following components: ethylene-vinyl acetate copolymerization polymer and a blending polymer alloy thereof; polyvinylpyrrolidone and complex microelements and drug thereof; and polymer micro nanoparticles. The controlled release coating material containing the polymer micro nanoparticles is adjustable in chemical structure and has good film-forming property and degradability; by adding the polymer micro nanoparticles with uniform particle size, the porosity and controlled release property of coating can be regulated; besides, by loading specific active substances in a chemical bonding manner, multi-functionalization of controlled-release fertilizer is realized. The controlled release coating material containing the polymer micro nanoparticles can be taken as a coating of an agricultural controlled release fertilizer and can be also taken as a pesticide controlled release coating and coatings of other medical products.
Owner:邢长民
Preparation method of sustained and controlled release coated material from polymer micro-nano particles employing embedding method
The invention relates to a preparation method of a sustained and controlled release coated material, and particularly relates to a method for preparing a sustained and controlled release coated material from polymer micro-nano particle employing an embedding method. The method comprises the following steps: preparing the polymer micro-nano particles; dissolving environment-friendly biodegradable polymers and blending polymer alloy thereof; dissolving polyvinylpyrrolidone and microelements complexed by polyvinylpyrrolidone and drugs; mixing disperse systems obtained in the previous steps; atomizing, spraying and drying the surface of a granulated fertilizer. The method for preparing the sustained and controlled release coated material is simple and convenient in technology; the used solvent is low in toxicity and can be recycled; regulation and control of the porosity and the slow controlled release performance of a capsule are achieved by adding the polymer micro-nano particles with even grain sizes.
Owner:邢长民
Industrial heat-resisting fireproofing instrument cable and manufacturing technology thereof
ActiveCN103345964ASmall structure sizeGood mechanical and electrical propertiesInsulated cablesCable/conductor manufacturePolyesterCopper foil
The invention discloses an industrial heat-resisting fireproofing instrument cable which is characterized in that a conductor is formed by a plurality of tinned copper wires in a twisting mode, a fireproofing layer wraps the conductor in a pressing mode, an insulating layer wraps the fireproofing layer in a pressing mode to form an insulating wire core, a pair twisting set is formed by two insulating wire cores, a polyester belt wraps the outer surface of the pair twisting set in a lapping mode, and a shielding layer knitted by tinned copper wires is arranged on the outer surface of the polyester belt to form a pair twisting unit. A cable core is formed by the multiple pair twisting units in a twisting mode. A polyester belt lapping wrapping layer, a longitudinal drainage wire, a tinned copper wire knitting total shielding layer, a copper foil lapping wrapping layer and an outer jacket layer formed in a pressing wrapping mode are sequentially arranged on the outer surface of the cable core from inside to outside, and the insulating layer and the outer jacket layer are made of fluororesin. The industrial heat-resisting fireproofing instrument cable has excellent fireproof performance and high-temperature-resisting performance, has excellent electrical performance and bending performance, is light and handy in cable structure, and meets the requirement for serving as an electric instrument connecting wire under the harsh high temperature environment.
Owner:安徽虹都电缆集团有限公司
Low-dielectric constant insulating media monox thin-film and preparing method thereof
InactiveCN1585101AAdjustable rigidityFlexible and adjustableSemiconductor/solid-state device manufacturingSilsesquioxaneHYDROSOL
The film is made of the material with the general formula of SiOxRy, whose comical bond is Si-O.Si-C.C-H; which contains Nanometer micropore. The producing process is as below. The siloxane organics is applied as template to produce the colloidal sol in the organic liquid, and paint the colloidal sol on the silicon wafer to form the film. The anneal temperature is around 200-600 deg.C and the heating up rate is about 5-20 deg.C per minute.
Owner:NANJING UNIV
Star-shaped polyglutamic acid as well as injectable hydrogel and preparation method thereof
InactiveCN105482104ASpeed controlControl mechanical strengthAerosol deliveryOintment deliveryPolymer scienceCyclodextrin
The invention relates to a star-shaped polyglutamic acid as well as injectable hydrogel and a preparation method thereof. According to the preparation method, firstly, polyamino beta-cyclodextrin is stereospecifically synthesized, secondly, a plurality of polymerization reaction initiation sites are introduced so as to initiate ring-opening polymerization of L-glutamate-N-carboxylic acid anhydride, and finally the L-glutamate-N-carboxylic acid anhydride subjected to ring-opening polymerization is modified to be used as a first component of hydrogel; meanwhile, modified polysaccharide polymer is used as a second component of the hydrogel, the two components are mixed according to a certain ratio, through chemical crosslinking of the Schiff base reaction, the star-polyglutamic acid hydrogel is obtained, and the gelation time is 7-300 s. The hydrogel is characterized by having an excellent apparent appearance, mechanical properties, biocompatibility and biodegradability; in addition, beta-cyclodextrin is used as a core of the star-shaped polyglutamic acid, so that additional stable crosslinking sites are provided, the improvement of the mechanical strength of the hydrogel is facilitated, and the loading and controlled release properties to hydrophobic drugs are improved. The hydrogel has a wide application prospect in the fields of drug controlled release, tissue engineering, regenerative medicine and the like.
Owner:SHANGHAI UNIV
Bioactive porous titanium medical implant material and preparation method
ActiveCN104922727AImprove adhesionImprove biological activityCoatingsProsthesisImplant materialTitanium oxide
The invention discloses a bioactive porous titanium medical implant material and a preparation method and belongs to the technical field of biomedical materials. The material comprises a base layer and a surface layer; the base layer is made of porous titanium; the surface layer includes a dense titanium oxide layer, a titanium oxide gel mediate layer and a calcium phosphate external layer. The method includes porous titanium blank preparation, blank sintering and surface chemical and electrochemical treatment. The material prepared by the method has the advantages of a three-dimensional communicated porous structure with adjustable porosity and pore size, the mechanical strength matches with the body's natural bones, the bioactivity can be improved through the bioactive layer with the three layered surface structure, the porous material with a gradient pore structure can be prepared through combination of organic foam with different pore sizes, and the material is particularly adaptive to serving as a bone defect repair or replace material of the human body load-bearing portion.
Owner:SICHUAN UNIV
Preparation method of heat-resisting seal microcapsule with sensitive pressure
ActiveCN103285794AControl mechanical strengthControl tightnessMicroballoon preparationMicrocapsule preparationPolymer scienceRepair material
The invention discloses a preparation method of a heat-resisting seal microcapsule with sensitive pressure. The preparation method comprises the steps of: firstly, preparing a microcapsule wall material, controlling the temperature to be within 20-80 DEG C, preparing epoxy rein and a core material curing agent equivalent to 0.50-0.85 time that of the epoxy resin into a prepolymer; then dissolving a prepolymer wall material in a solvent to form a solution; controlling the temperature of the solution to be within 20-80 DEG C, dropping a core material in the solution by using a needle hole until the microcapsule wall is cured and formed; filtering, washing and drying to obtain the heat-resisting seal microcapsule with the sensitive pressure. The preparation method is simple in process and equipment; meanwhile, a water phase is not introduced and the limitation to the water solubility or oil solubility of the microcapsule core material is not caused; through controlling the proportion and a system degree of functionality between the epoxy resin and the curing agent, the mechanical strength, the sealing property and the heat resistance of the microcapsule can be effectively controlled. The microcapsule is used as a micro-container, and can be used in fields of self-repairing materials, latent adhesives or other core materials needing release control or isolation.
Owner:JURONG NINGWU SCI & TECH DEV
Large area nitrogen-doped carbon nano-tube paper preparation method
ActiveCN106082163AControl nitrogen contentControl mechanical strengthNanotechnologyNew energyCarbon nanotube
The invention provides a large area nitrogen-doped carbon nano-tube paper preparation method, which comprises: (1) weighing ferrocene powder, dissolving in dichlorobenzene to form a ferrocene / dichlorobenzene carbon source solution, weighing pyridine, and mixing the pyridine and the ferrocene / dichlorobenzene carbon source solution to form a ferrocene / dichlorobenzene / pyridine mixing carbon source solution; 2) coiling an iron sheet or copper sheet substrate into a cylindrical material, placing into the quartz reaction chamber of a reaction furnace, sealing the reaction chamber, introducing argon gas to completely discharge air, and heating the reaction furnace; 3) when the temperature of the reaction chamber achieves 750-900 DEG C, adjusting the argon flow rate while introducing hydrogen; 4) injecting the ferrocene / dichlorobenzene / pyridine mixing carbon source solution into the reaction chamber, and carrying out a reaction; and 5) stopping the heating of the tubular reaction furnace, closing the hydrogen, adjusting argon flow rate to make the product be cooled to a room temperature along with the furnace, and collecting the large area nitrogen-doped carbon nano-tube paper on the substrate. According to the present invention, the nitrogen-doped structure carbon nano-tube film two-dimensional structure and the simple, rapid and large-scale preparation method can be used for the fields of new energy sources, sensors, flexible electronic devices, and the like.
Owner:SUN YAT SEN UNIV
High-strength pollution-resistant composite reverse osmosis membrane and preparation method thereof
ActiveCN112403288AGood dispersionImprove throughputGeneral water supply conservationReverse osmosisNanowireReverse osmosis
The invention relates to a preparation method and application of a high-strength pollution-resistant composite reverse osmosis membrane, and the method comprises the following steps: synthesizing aminated carbon nanowires, fixing the nanowires in the reverse osmosis membrane, and by utilizing the high strength of the aminated carbon nanowires and the reactivity of amino groups, forming a double cross-linked layer of m-phenylenediamine (MPD) trimesoyl chloride (TMC) and aminated carbon nanowire trimesoyl chloride (TMC), so the stability and the mechanical strength of a desalting layer are greatly improved, and meanwhile, the flux and the desalting performance of reverse osmosis are also improved due to excellent dispersing performance, rich hydrophilic amino groups and relatively large specific surface area of aminated carbon nanowires. The test result also shows that compared with the existing reverse osmosis membrane, the reverse osmosis membrane prepared by the invention has higher mechanical strength, flux and desalination performance.
Owner:JIANGSU LONGMEM ENVIRONMENTAL TECH CO LTD
Preparation method of PAA hydrogel loaded with double-bond dopamine
ActiveCN111171213AHigh mechanical strengthImprove adsorption capacityOther chemical processesWater contaminantsSorbentDopamine
The invention discloses a preparation method of PAA hydrogel loaded with double-bond dopamine. The preparation method comprises the following steps: adding double-bond dopamine into deionized water, and carrying out ultrasonic dispersion to obtain a double-bond dopamine dispersion liquid; mixing acrylic acid A with the double-bond dopamine dispersion liquid, stirring, adding ammonium persulfate, stirring to initiate cross-linking, placing an obtained system under an ultraviolet lamp for illumination, accelerating solution gelatinization, cooling to room temperature, freezing in a refrigeratorovernight, taking out, and unfreezing to obtain the hydrogel. Acrylic acid used in the invention is subjected to a cross-linking reaction to form gel, and the purely cross-linked PAA hydrogel has goodmechanical strength and few functional groups; after the double-bond dopamine is added, the double-bond dopamine directly participates in forming gel as a hydrogel skeleton, so that functional groupscan be increased under the condition of not greatly changing the strength, and the adsorption effect of the hydrogel on heavy metal ions is greatly improved; therefore, the hydrogel can be used as anadsorbent for adsorbing lead and cadmium ions more effectively.
Owner:SOUTHWEAT UNIV OF SCI & TECH
Graphite foam and preparation method thereof
ActiveCN106673700AHigh compressive strengthImprove thermal conductivityCeramic extrusion diesCeramicwareHigh pressure cellElectromagnetic shielding
The invention provides a preparation method of graphite foam. The method comprises the following steps that graphite nanosheets are used as raw materials; a small number of macromolecular bonding agents are added; through template forming, the graphite foam is formed after the drying. The preparation method provided by the invention is simple and convenient, and can be used for forming graphite foam in various shapes; in addition, the prepared graphite foam has the controllable density and uniform pores. The prepared graphite foam also has the advantages of high pressure-resistant intensity, low resistance, oil absorbability, high heat conductivity and the like, can be widely applied to the fields of heat radiators, heat conduction pads, electromagnetic shielding materials and the like, and has wide application prospects.
Owner:HARBIN INST OF TECH AT WEIHAI
Comprehensive cable for sea island and fabrication method of comprehensive cable
InactiveCN105632596AReduce maintenance costsReduce manufacturing costConductive materialFlexible cablesPower cableCoaxial cable
The invention discloses a comprehensive cable for a sea island and a fabrication method of the comprehensive cable. The comprehensive cable is characterized in that a cable core is formed by jointly twisting two coaxial cables, two groups of twisted-pair wire cores, three power cable insulation wire cores and a waterproof filling rope, and an inner sheath layer formed through extrusion, an armor layer formed by spare winding of an aluminum alloy wire and an outer sheath layer formed through extrusion by taking polyethylene as a material are sequentially arranged outside the cable core from inside to outside. In the comprehensive cable for the sea island, a power wire core and a communication and data transmission cable are integrated; and compared with a dispersed cable, the comprehensive cable has the advantages that the manufacture and laying cost of a product are greatly reduced, meanwhile, the maintenance cost of the cable is also reduced, and the comprehensive cable has obvious economic benefit.
Owner:ANHUI HANGTIAN CABLE GROUP
Micro-capsule essence with two-layer capsule wall and preparation method and application thereof
ActiveCN101649254BHigh mechanical strengthGood flexibilityMicroballoon preparationMicrocapsule preparationEngineeringTechnological design
The invention discloses a micro-capsule essence with two-layer capsule walls and a preparation method and an application thereof. The essence comprises inner oil essence, a first micro-capsule wall in the middle and an outer capsule wall located on outermost layer. The micro-capsule essence with two-layer capsule wall of the invention has two-layer capsule wall structure , good mechanical strength and flexibitity; in addition, when used in cloth the micro-capsule essence has the advantage of strong washing resistance, long fragrance holding time and easy storage. The preparation method of themicro-capsule essence with two-layer capsule walls adopts complex coacervation phase separation method to prepare the essence, the technological design is seasonable, the maneuverability is strong, micro-capsule essence with different fragrances can be designed according to different demands; in the preparation process, the mechanical strength of the micro-capsule essence can be effectively controlled so as to control the duration time and degree of the frangrance of the micro-capsule essence; in addition, the finished product of the micro-capsule essence with two-layer capsule walls preparedin the invention has high qualification rate and the micro-capsule essence with two-layer capsule can realize industrialized production.
Owner:澳华达香精(广州)有限公司
Membrane coated hydroxyapatite ceramic spinal fusion cage
InactiveCN102188757AOvercoming brittlenessMaintain biological activitySurgeryCoatingsApatiteHigh surface
The invention relates to a membrane coated hydroxyapatite (HA) ceramic spinal fusion cage prepared by adding HA powder to a polyether-ether-ketone material and sintering, and the surface of the spinal fusion cage is coated by a polylactic acid (PLA) membrane, wherein the HA can adjust and control the composition and grain size of the material to achieve the best mechanical property of the material; and the PLA membrane with high surface molecular weight can further effectively overcome the brittleness of HA, and especially improves the fracture toughness, thus overcoming the brittleness of the conventional HA ceramics, and meeting the mechanical requirements on the spinal fusion cage. Simultaneously, the HA ceramic spinal fusion cage provided by the invention can keep the biological activity of the HA and achieve bony fusion with bone in vivo. The invention also comprises the membrane coating method of the membrane coated HA ceramic spinal fusion cage.
Owner:BEIJING ALLGENS MEDICAL SCI & TECH +1
Apparatus and method for detecting wear resistance of flue gas denitration catalyst
PendingCN106442192AGuaranteed accuracyReduce pollutionInvestigating abrasion/wear resistanceDifferential pressureTest sample
The invention relates to an apparatus and method for detecting the wear resistance of a flue gas denitration catalyst. No apparatus or method for detecting the wear resistance of the catalyst exists at present, so the mechanical strength of the catalyst is difficult to control. The apparatus comprises a test sample bin and an apparatus rack, and also comprises a quartz sand feeder, a wind blower, a wind speed measurer, a wind speed adjusting device, a contrast sample bin, a feeding homogenizer, a discharging tube, a wind tube, a differential pressure measuring device, a cloth bag deduster and an abrasive collection barrel, one end of the wind tube is connected with the wind blower, the other end of the wind tube is connected with the abrasive collection barrel, the wind speed adjusting device, the wind speed measurer, the feeding homogenizer, the test sample bin and the differential pressure measuring device are mounted on the wind tube, and the contrast sample bin is connected with the test sample bin serially or in parallel. The disadvantages of high performance detection cost and unable complete simulation of onsite practical running conditions of present SCR denitration catalysts are overcome in the invention.
Owner:HUADIAN ELECTRIC POWER SCI INST CO LTD
A sustained and controlled release coating material containing macromolecule micro-nanoparticles
ActiveCN103435424BUnique Water Solubility PropertiesUniform particle sizeFertilizer mixturesChemical structurePorosity
The invention provides a controlled release coating material containing polymer micro nanoparticles. The controlled release coating material comprises the following components: ethylene-vinyl acetate copolymerization polymer and a blending polymer alloy thereof; polyvinylpyrrolidone and complex microelements and drug thereof; and polymer micro nanoparticles. The controlled release coating material containing the polymer micro nanoparticles is adjustable in chemical structure and has good film-forming property and degradability; by adding the polymer micro nanoparticles with uniform particle size, the porosity and controlled release property of coating can be regulated; besides, by loading specific active substances in a chemical bonding manner, multi-functionalization of controlled-release fertilizer is realized. The controlled release coating material containing the polymer micro nanoparticles can be taken as a coating of an agricultural controlled release fertilizer and can be also taken as a pesticide controlled release coating and coatings of other medical products.
Owner:邢长民
Bioactive bone repair scaffold and preparation method thereof
ActiveCN110368524ASave materialLow costAdditive manufacturing apparatusTissue regenerationChemistryMagnesium
The invention discloses a bioactive bone repair scaffold and a preparation method thereof. The bioactive bone repair scaffold is prepared from, by mass, 55-85% of a degradable polymer serving as a matrix, and 5-15% magnesium lithium silicate and 10-30% of magnesium which serve as a reinforcement phase. The preparation method of the scaffold comprises the following steps of 1) preparation of magnesium lithium silicate hydrogel, 2) preparation of a mixture, 3) preparation of 3D printing raw material particles and 4) 3D printing of the bioactive bone repairing scaffold. The internal and externalstructures of the scaffold can be subjected to customized design, no organic solvent is added, the multi-component interface bonding is good, and the mechanical strength requirement(0.2-80 MPa) of thecancellous bone can be met; self-responding sustained-release of functional ions induces sedimentation of hydroxyapatite on the surface of the scaffold, the bone and cartilage injury can be synergistically repaired, customizedpreparation of the bioactive bone repair scaffold is achieved, and the application prospects of the scaffold in the field of rehabilitation treatment of the bone and cartilage injury and the like are broadened.
Owner:SOUTHEAST UNIV
Anisotropic self-reinforced organic silicon composite material and preparation method thereof
The invention discloses an anisotropic self-reinforced organic silicon composite material and a preparation method thereof. The composite material is characterized by comprising the following raw material components in percentage by mass: 71-86% of organic silicon polymer monomer, 5-9% of organic silicon cross-linking agent and 8-22% of liquid filling substance. The method comprises the following steps: uniformly mixing a filling liquid, the organic silicon polymer monomer and the cross-linking agent under mechanical stirring, and dispersing the liquid in the organosilicon monomer in a form of liquid drops to form an emulsion; then, performing primary polymerization of organic silicon macromolecules under heating or room temperature, and fixing the spherical liquid drops in the organic silicon network; and finally, stretching the obtained composite film to a certain proportion under the action of external force, and simultaneously performing heating and polymerizing to realize further curing so as to obtain the anisotropic self-reinforced polymer material. The preparation method is simple, easy to operate and high in practicability, the self-reinforced polymer material with anisotropy and mechanical force response can be obtained at the same time, and the self-reinforced polymer material has wide application prospects.
Owner:NANJING UNIV OF TECH +1
Preparation method of honeycomb sandwich structured wave-absorbing composite filled with leaf-like nano-Fe3O4
ActiveCN110041884AEffective control of shape and sizeControl mechanical strengthMaterial nanotechnologyOther chemical processesCarbon fibersPotassium ferricyanide
The invention discloses a preparation method of a honeycomb sandwich structured wave-absorbing composite filled with leaf-like nano-Fe3O4, and relates to the technical field of electromagnetic stealthcomposites. According to the method, leaf-like alpha-Fe3O4 is synthesized from potassium ferricyanide as a raw material with a hydrothermal method; leaf-like alpha-Fe3O4 is reduced into leaf-like nano-Fe3O4 with a high-heat treatment method, honeycomb holes of a periodic aramid honeycomb board are filled with leaf-like nano-Fe3O4, the upper side and the lower side of the honeycomb board are covered with glass fiber reinforced resin based composite skin and carbon fiber reinforced resin based composite skin respectively, and the honeycomb sandwich structured wave-absorbing composite filled with leaf-like nano-Fe3O4 is obtained. The effective absorption frequency bandwidth at the thickness of 4 mm is 2.6 GHz (in the frequency band range of 12.8 GHz-15.4 GHz), and the maximum absorption strength at 14.2 GHz reaches -36 dB. The technical problems of poor electromagnetic wave absorption intensity and poor mechanical bearing capacity of a traditional wave absorption material are solved.
Owner:SHENZHEN STRONG ADVANCED MATERIALS RES INST CO LTD
Preparation method of high strength hydrogel with simulated insect cuticle structure
The invention belongs to the field of biomass materials, and relates to a preparation method of a high strength hydrogel with a simulated insect cuticle structure. The preparation method comprises following steps: (1) subjecting chitin to a partial deacetylation treatment; (2) diluting the product obtained in the step (1) by an acetic acid solution, and then grinding the product; (3) diluting theproduct obtained in the step (2) by distilled water, carrying out an ultrasonic treatment, filtering the solution in vacuum, and carrying out film forming; (4) fully impregnating the product obtainedin the step (3) in a gelatin solution; and (5) impregnating the product obtained in the step (4) into a quinone crosslinking reaction solution, and making the product carry out quinone crosslinking reactions at a room temperature to obtain partially de-acetylated chitin nano fiber / gelatin composite gel. The operation of the method is simple and rapid; and moreover, the prepared composite hydrogelhas excellent mechanical properties and has a great application value in fields such as artificial skin, biosensors, soft tissue engineering materials, and the like.
Owner:NANJING FORESTRY UNIV
A kind of preparation method of large-area nitrogen-doped carbon nanotube paper
ActiveCN106082163BEvenly distributedControl nitrogen contentCarbon nanotubesNanotechnologyNew energyFlexible electronics
Owner:SUN YAT SEN UNIV
An industrial heat-resistant and fire-resistant instrument cable and its preparation process
ActiveCN103345964BSmall structure sizeImprove electrical performanceInsulated cablesCable/conductor manufacturePolyesterElectrical conductor
The invention discloses an industrial heat-resisting fireproofing instrument cable which is characterized in that a conductor is formed by a plurality of tinned copper wires in a twisting mode, a fireproofing layer wraps the conductor in a pressing mode, an insulating layer wraps the fireproofing layer in a pressing mode to form an insulating wire core, a pair twisting set is formed by two insulating wire cores, a polyester belt wraps the outer surface of the pair twisting set in a lapping mode, and a shielding layer knitted by tinned copper wires is arranged on the outer surface of the polyester belt to form a pair twisting unit. A cable core is formed by the multiple pair twisting units in a twisting mode. A polyester belt lapping wrapping layer, a longitudinal drainage wire, a tinned copper wire knitting total shielding layer, a copper foil lapping wrapping layer and an outer jacket layer formed in a pressing wrapping mode are sequentially arranged on the outer surface of the cable core from inside to outside, and the insulating layer and the outer jacket layer are made of fluororesin. The industrial heat-resisting fireproofing instrument cable has excellent fireproof performance and high-temperature-resisting performance, has excellent electrical performance and bending performance, is light and handy in cable structure, and meets the requirement for serving as an electric instrument connecting wire under the harsh high temperature environment.
Owner:安徽虹都电缆集团有限公司
A high-strength room-temperature fast-curing two-component epoxy structural adhesive
ActiveCN109266274BControl operation timeControl mechanical strengthNon-macromolecular adhesive additivesMacromolecular adhesive additivesPolymer scienceAdhesive
The invention discloses a high-strength room-temperature-fast-curing bicomponent epoxy-structured adhesive. A component A comprises epoxy resin, a couplant A and fillers, and a component B comprises amodified polyamide curing agent with high imidazoline content, two kinds of different types of modified aliphatic amine curing agents B and C, a toughener, a couplant B and fillers. According to theadhesive, problems in heat resistance, speed increasing and toughening of room-temperature curing of adhesives are solved; the adhesive has better wetting effect and binding power on a substrate, andthe probability of cavity and delaminating is lowered; through adding appropriate fillers, controlling the operating time, mechanical strength and sagging resistance of the adhesive and optimally combining all ingredients of the adhesive, the strength requirements of the adhesive are guaranteed. The adhesive disclosed by the invention can be applied to bonding of composite materials such as metallic materials and non-metallic materials, such as polyurethane foam plates, aluminum honeycomb panels and aluminum plates and production of laminated sandwich plates of military and civilian compartments.
Owner:SYST EQUIP CO LTD OF THE 28TH RES INST LI YANG
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