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47results about How to "Strong steric hindrance" patented technology
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Preparation method of oxidation-etherification starch used as concrete water reducer
The invention relates to a preparation method of oxidation-etherification starch used as concrete water reducer. The preparation method is characterized by comprising the following steps: adding water into starch to prepare starch milk with moisture content of 20-40 percent; adjusting the pH value to 9-11; adding sodium hypochlorite as an oxidant the weight of which is 6-10 percent of the weight of the starch, mixing and reacting for 3-4h at the temperature of 35-40 DEG C under stirring; neutralizing until the pH value is 7-8; adding sodium bisulfite the weight of which is 5-15 percent of the weight of the oxidant to stop the reaction; filtering, washing and drying to obtain oxidized starch; dispersing the oxidized starch into absolute alcohol to prepare suspension with the concentration of 30-40 percent; adjusting the pH to 9-11; adding a mixed solution of oxacyclopropane and absolute alcohol and mixing; placing the mixture in an airtight reactor and reacting for 16-24h at the temperature of 40-45 EDG C under the protection nitrogen; neutralizing until the pH value is 7-8; and filtering, washing the solid with the absolute alcohol and drying to obtained the oxidation-etherification starch product. The preparation process is environmental-friendly and innocuous and has excellent performance when used as the water reducer.
Owner:SICHUAN HUASHI GREEN HOMELAND BUILDING MATERIALS
Polyester resin used for TGIC curing high-toughness thermal transfer printing powder paints, and preparation method thereof
ActiveCN105367765AHigh glass transition temperatureImprove toughnessPowdery paintsPolyester coatingsVitrificationPolyol
The invention relates to a polyester resin used for TGIC curing high-toughness thermal transfer printing powder paints, and a preparation method thereof. The glass-transition temperature of the polyester resin is relatively high, so that prepared powder paint coating possesses high toughness at normal temperature and -15 DEG C. According to the preparation method, the polyester resin is obtained via melt polycondensation of following raw materials: a polyol, a polyacid, an acidolysis agent, an esterification catalyst, an antioxidant, and a curing accelerator. The preparation method comprises following steps: 1) the polyol is delivered into a reaction kettle at a needed ratio, rapid heating esterification is carried out, water is generated, and is removed via distillation; 2) temperature is increased gradually, and an obtained material is maintained to be clear; 3) sample examination is carried out; 4) one half of the antioxidant is added, and negative pressure polycondensation is carried out; and 5) cooling is carried out, one half of the antioxidant and the curing accelerator are added, stirring dispersing is carried out, and an obtained product is cooled, and is collected.
Owner:ZHEJIANG CHUANHUA TIANSONG NEW MATERIAL CO LTD
Zero-VOC (volatile organic compound) cement-based water-proof material copolymer emulsion and preparation method thereof
The invention discloses zero-VOC (volatile organic compound) cement-based water-proof material copolymer emulsion and a preparation method thereof. The preparation method adopts a zero-VOC copolymer emulsion component A and an inorganic powder component B, the zero-VOC copolymer emulsion component A is prepared from deionized water, alkyl acrylate, styrene, acrylic acid functional monomers, emulsifying agents, initiators, a buffer agents, polymerization inhibitors, oxidizing agents, reducing agents, sterilizing agents and defoaming agents through polymerization of pre-emulsification semi-continuous seed emulsion, and the inorganic powder component B comprises ordinary portland cement, quartz sand and water reducers. The prepared emulsion is high in solid content, low in viscosity, uniformin particle size and good in stability and has excellent rheological property and coating water absorption, the content of a residual monomer in an emulsion product is lower than 300ppm and meets national zero-VOC emulsion standards, the emulsion is environmentally friendly and free from toxicity and pollution, the compatibility of the emulsion and cement is good, and a prepared polymer cement waterproof coating is excellent in water resistance, good in low-temperature flexibility and low in water absorption.
Owner:SOUTH CHINA UNIV OF TECH
Slow-release collapse-preventing type polycarboxylic water reducing agent and preparation method thereof
The invention discloses slow-release collapse-preventing type polycarboxylic water reducing agent and a preparation method thereof, and belongs to the field of preparation of the water reducing agent. The slow-release collapse-preventing type polycarboxylic water reducing agent consists of methyl allyl polyoxyethylene ether, acrylic acid, methyl acrylic polyethylene glycol monoester, imide, initiator, vitamin C, chain transfer agent and deionized water. The preparation method comprises the following steps of: preparing macromonomer methyl allyl polyoxyethylene ether, acrylic acid, methyl acrylic polyethylene glycol monoester, imide and vitamin C; under the action of the polymerization initiator and the chain transfer agent, dissolving the methyl allyl polyoxyethylene ether into deionized water, rising temperature to 40 DEG C for dissolving, adding the initiator, then respectively dripping water solution A prepared by dissolving the chain transfer agent, the acrylic acid, the methyl acrylic polyethylene glycol monoester and the imide in the deionized water and V.C water solution B, and after the dripping is finished, carrying out insulation, cooling and neutralization to obtain a finished product. The slow-release collapse-preventing type polycarboxylic water reducing agent disclosed by the invention has the advantages that the loss and the evaporation of water in concrete due to long-time transportation and higher temperature are effectively prevented, and the difficulty of excessively-fast slump loss of the concrete in engineering is solved.
Owner:MAANSHAN CHINASEA NEW MATERIAL
Method for synthesizing dihydroxypropyl bisphenol A ether through one-step process
ActiveCN103641696AHigh activityStrong steric hindranceEther preparation from oxiranesSimple Organic CompoundsHigh energy
The invention relates to a method for synthesizing dihydroxypropyl bisphenol A ether through a one-step process, and belongs to the technical field of organic compound synthesis. The method comprises the steps of: by taking bisphenol A as the raw material, orderly carrying out material melting and synthesis by adding a chain extension agent, and finally obtaining the dihydroxypropyl bisphenol A ether, wherein the hydroxyl value of the dihydroxypropyl bisphenol A ether is 325-330mgKOH / g, and the color of the dihydroxypropyl bisphenol A ether is smaller than No.30. The technical scheme of the method is used for synthesizing the product through the one-step process, and the problems of complex preparation process, many process steps, high energy consumption, high composite cost, poor product quality and so on in the conventional technology are solved; the obtained product is rational in distribution, low in product color; and the content of the by-product allyl alcohol matters is low.
Owner:ZHEJIANG HUANGMA TECH
Preparation method for modified starch comb-shaped copolymer
InactiveCN105273137AAvoid excessive retardationReduce anion chargeEsterification reactionMaleic anhydride
The invention discloses a preparation method for a modified starch comb-shaped copolymer. The preparation method comprises: sulfonated starch is prepared, an esterification reaction with maleic anhydride is carried out, esterified starch is prepared, finally, a copolymerization reaction is carried out and a modified starch comb-shaped copolymer product is obtained. The prepared comb-shaped copolymer forms strong steric hindrance on outer surfaces of cement particles, is beneficial for dispersion effects, and has a high water-reducing rate and shrinkage ratio.
Owner:YANCHENG INST OF TECH
Dispersing agent for fluorescent brightener, fluorescent brightener aqueous dispersion, preparation method of dispersing agent, as well as preparation method and application of fluorescent brightener aqueous dispersion
The invention relates to a dispersing agent for a fluorescent brightener, a fluorescent brightener aqueous dispersion, a preparation method of the dispersing agent, as well as a preparation method and application of the fluorescent brightener aqueous dispersion. The preparation method of the dispersing agent comprises the following steps: firstly, separately dissolving acrylamide and an allyl polyoxyethylene ether monomer of which the polymerization degree is 23 in a proper amount of deionized water; then, controlling the temperature to be 79-81 DEG C under the stirring condition, separately adding the allyl polyoxyethylene ether monomer aqueous solution and an ammonium persulfate initiating agent into a four-mouth flask filled with a certain amount of deionized water drop by drop within 2-3 hours, and carrying out 3-4 hours' heat preservation after the drop-by-drop adding is finished; finally, carrying out cooling to prepare the dispersing agent of which the weight-average molecular weight is 10000-20000. The invention further provides the fluorescent brightener aqueous dispersion which contains the fluorescent brightener OB-1, the prepared dispersing agent and deionized water. When the fluorescent brightener aqueous dispersion is applied to whitening of a fabric, the fabric can be whitened and brightened very uniformly, and the whitening effect is obvious.
Owner:临清三和纺织集团有限公司
Polycarboxylic acid, use thereof and water reducer containing same
ActiveCN102093522AStrong steric hindranceHigh water reduction rateHigh strength concretePolymer science
The invention provides polycarboxylic acid, use thereof and a water reducer containing the same, belongs to the technical field of cement additives and solves the problems of low water reduction rate and slump keeping performance of the conventional water reducer. The polycarboxylic acid is an irregular copolymer formed by polymerization of 50 to 80 weight percent of unsaturated polyether of a general formula below, 15 to 30 weight percent of unsaturated carboxylate or unsaturated carboxylate and 0 to 25 weight percent of third monomer which has unsaturated double bonds and polar groups, wherein R1 and R2 represent hydrogen atom or methyl; R3 and R5 represent oxyalkylene; R4 and R6 represent hydrogen atoms or C1 to C20 alkyl; a and c are integers between o and 3; b and d are 0 or 1; and m and n are integers between 10 to 50. The water reducer provided by the invention consists of 40 to 60 weight percent of polycarboxylic acid and the balance of water. The invention also discloses the use of the polycarboxylic acid in water reducer. The water reducer can be used high-strength concrete.
Owner:武汉格瑞林建材科技股份有限公司
Mono-carboxyl chitosan/alkannin composite nanometer particles and preparation method thereof
ActiveCN110384684AImprove stabilityImprove accessibilityOrganic active ingredientsPharmaceutical non-active ingredientsEnvironmental resistanceCross-link
The invention discloses mono-carboxyl chitosan / alkannin composite nanometer particles and a preparation method thereof. Alkannin coated nanometer particles are prepared through ion gel coagulation effects of water-soluble mono-carboxyl chitosan and sodium tripolyphosphate, and then mutual cross-linking and assembling of hydrophilic macromolecule addition agents and the mono-carboxyl chitosan, composite nanometer particle being small in particle diameter, homogeneous in size, high in stability and good in biological activity are prepared. The method disclosed by the invention is simple and easyto operate, low in cost, mild in reaction condition, environmentally-friendly, safe and non-toxic, the obtained composite nanometer particles are resistant to gastric acid and high in stability, andthe orally-taken absorption and utilization rate of a Chinese herbal medicine namely alkannin and the target medicine release properties are effectively improved.
Owner:ANHUI AGRICULTURAL UNIVERSITY
Organic compound, and electronic element and electronic device using same
ActiveCN112250701AIncrease steric hindranceStrong steric hindranceSilicon organic compoundsSolid-state devicesSimple Organic CompoundsElectronic component
The invention relates to an organic compound, and an electronic element and an electronic device using the same. The present disclosure relates to an organic compound having a structure represented bythe following formula (I): wherein A1, A2, A3 and A4 are the same or different from each other and are each independently selected from a benzene ring, a fused aromatic ring having 10-30 ring-formingcarbon atoms, and a fused heteroaromatic ring having 10-30 ring-forming carbon atoms. When the organic compound is used as an organic light-emitting layer material of an organic light-emitting device, the light-emitting performance of the device can be improved, and the service life of the device can be prolonged.
Owner:SHAANXI LIGHTE OPTOELECTRONICS MATERIAL CO LTD
Comb polyelectrolyte type dispersing agent with dispersed nano particles and preparation method of dispersing agent
The invention belongs to the technical field of dispersing agent preparation, and discloses a comb polyelectrolyte type dispersing agent with dispersed nano particles and a preparation method of the dispersing agent. The dispersing agent comprises 3-(2-methacryloyloxyethyl trimethyl dimethylamino) propanesulfonic acid salt, enol polyoxyethylene ether, a chain transfer agent, an initiator, a chain terminator and deionized water. The prepared dispersing agent disclosed by the invention is comb polyamphoteric electrolyte; and after the nano particles adsorb the dispersing agent disclosed by the invention, steric hindrance effect among nano particles is relatively strong, and sedimentation is hardly caused. Therefore, the dispersing effect is good. Meanwhile, quaternary ammonium salt cation is introduced into a macromolecule main chain, so that the hydratability and the heat stability of the dispersing agent are enhanced.
Owner:国科广化(南雄)新材料研究院有限公司 +1
Polylactic acid/ MWCNT (multi-walled carbon nanotube) sensitive material with low percolation threshold and low limit of detection and application of polylactic acid/ MWCNT sensitive material
InactiveCN105670253AGood dispersionGood film formingMaterial resistanceComposite filmCarbon nanotube
The invention discloses a polylactic acid / MWCNT (multi-walled carbon nanotube) sensitive material with low percolation threshold and low limit of detection and an application of the polylactic acid / MWCNT sensitive material. The sensitive material is a homogenously dispersed body prepared from high-molecular-weight polylactic acid as a matrix and MWCNTs as a conductive current carrier through stirring and compounding at 40-50 DEG C with a simple and low-cost solution mixing technology, wherein polylactic acid accounts for 95.0wt%-97.5wt%, and the MWCNTs account for 2.5wt%-5.0wt%. Due to the strong steric hindrance action of high-molecular-weight polylactic acid and the good self-organization action of the high-molecular-weight polylactic acid on the surfaces of the CNTs, the sensitive material has good dispersibility, and the percolation threshold is as low as 2.9wt%; a composite film sensing element with smooth surface can be assembled conveniently from the sensitive material and is applied to chloroform vapor detection, the sensitive material has higher response intensity, rapid response and recovery performance and good repeatability and stability, and the limit of detection of chloroform vapor is as low as 10 ppm. The sensitive material can be taken as a novel gas sensor for rapid detection of indoor and outdoor environmental gas.
Owner:SHAANXI NORMAL UNIV
Heat-insulating fireproof decorative plate
InactiveCN109836947AHigh in phosphorusHigh nitrogen contentFireproof paintsCovering/liningsEmulsionAluminium hydroxide
The invention discloses a heat-insulating fireproof decorative plate and relates to the field of decoration. The decorative plate comprises a plate body, which is coated with a heat-insulating fireproof layer. Raw materials of the heat-insulating fireproof layer comprise the following ingredients (by weight): 25-30 parts of an acrylate emulsion adhesive, 3-5 parts of nano-aluminium hydroxide, 4-6parts of ammonium polyphosphate, and 2-4 parts of hollow glass beads. The invention has the following advantages: the heat-insulating fireproof system formed by the above ingredients has excellent fireproof and sound-insulation properties.
Owner:WENZHOU LECHENG DECORATION DESIGN CO LTD
Chitosan oligosaccharide graft modified polycarboxylic acid water reducing agent and preparation method of water reducing agent
The invention discloses a chitosan oligosaccharide graft modified polycarboxylic acid water reducing agent and a preparation method of the water reducing agent. The method comprises the following steps: 1) preparing a chitosan oligosaccharide amidated macro-monomer, placing chitosan oligosaccharide and maleic anhydride in a molar ratio of 1:1.02-1.1 into a polar solvent, adding a catalyst at 85-95DEG C and carrying out a reaction for 3-4 h under stirring, and performing washing and oven-drying to obtain the powdery chitosan oligosaccharide amidated macro-monomer; and 2) preparing the water reducing agent, performing free radical polymerization in an aqueous solution on methyl allyl polyoxyethylene ether and the chitosan oligosaccharide amidated macro-monomer to obtain the chitosan oligosaccharide graft modified polycarboxylic acid water reducing agent. The chitosan oligosaccharide amidated macro-monomer directly participates in polymerization through a carbon-carbon double bond, and has high polymerization activity, and chitosan oligosaccharide side chains can greatly enhance viscosity-increasing water-retention properties of the water reducing agent, and can further enhance dispersion of the water reducing agent. In addition, the chitosan oligosaccharide side chains interacts with polyether long side chains, so that a hydrated film formed on the surface of cement particles ismore stable, and slump-loss is smaller over time.
Owner:CCCC SHEC WUHAN PORT NEW MATERIALS
Beneficiation reagent and of separating and recycling precious metal from cooper anode mud using method thereof
ActiveCN102974467AImprove separation efficiencyHigh recovery rateFlotationSODIUM METAPHOSPHATEFoaming agent
The invention belongs to the field of precious metal metallurgy, in particular to a benenficiation reagent and a using method of separating and recycling precious metal from copper anode mud. According to weight proportion, the beneficiation reagent is composed of 1-10 parts by weight of collector pinitol xanthate and pinitol aerofloat, 1-10 parts by weight of inhibitor sodium, namely, hexametaphosphate and 1-10 parts by weight of foaming agent, namely, pinitol oil. The method of separating and recycling precious metal is that first of all, acid leaching pretreatment is performed, then acid leaching residue is prepared into slurry, the slurry is added with the beneficiation reagent and rough selection is performed, then two accurate selections are performed, and precious metal ores are acquired. The benericiation reagent and the using method of separating and recycling precious metal from cooper anode mud is strong in selectivity of the beneficiation reagent, high in precious metal separating efficiency, and high in recycling rate of gold and silver, and capable of reducing cost and pollution.
Owner:NORTHEASTERN UNIV
Polyurethane dispersant as well as preparation method and application thereof
ActiveCN112480365AOvercoming van der Waals forcesAvoid gatheringBiocideFungicidesPolymer sciencePtru catalyst
The invention provides a polyurethane dispersant as well as a preparation method and application thereof, and relates to the technical field of dispersants. The preparation method provided by the invention comprises the following steps: mixing polypropylene glycol, 2,2-dimethylolpropionic acid, aromatic isocyanate and an organic tin catalyst, and carrying out a first polymerization reaction to obtain a prepolymer; mixing the prepolymer with a ketone solution of 1,4-butanediol, and carrying out a second polymerization reaction to obtain a chain extension polymer; mixing the chain extension polymer with polyethylene glycol, and carrying out polycondensation reaction to obtain a polycondensate; mixing the polycondensate with a neutralizer, and carrying out neutralization reaction to obtain apolycondensate solution; and mixing the polycondensate solution with water, and emulsifying to obtain the polyurethane dispersant. By adopting the polyurethane dispersant prepared by the invention, the storage stability of a pesticide water suspending agent can be remarkably improved.
Owner:文水县是大高分子材料有限公司
Method for preparing bio-base high-efficiency delayed-coagulation water-reducing agent from natural chitin
The invention relates to a method for preparing a bio-base high-efficiency delayed-coagulation water-reducing agent from natural chitin. The method comprises the following steps: degrading a natural high polymer, and carrying out functional group remolding, so as to obtain a chitosan oligosaccharide intermediate containing functional groups such as amino and hydroxymethyl; carrying out condensation reaction by virtue of phenol and formaldehyde under alkaline conditions so as to generate a phenolic aldehyde intermediate, and carrying out addition reaction by virtue of sodium hydrogen sulfite and formaldehyde so as to introduce hydrophilic sulfonic acid groups to the phenolic aldehyde intermediate; and linking the chitosan oligosaccharide intermediate with the sulfonated phenolic aldehyde intermediate by virtue of hydroxymethyl polycondensation, so as to obtain the bio-base high-efficiency delayed-coagulation water-reducing agent with good water-reducing and delayed-coagulation effects. The chitin bio-base high-efficiency delayed-coagulation water-reducing agent has the characteristics of low raw material cost, environment-friendly protection process and the like and further has relatively good water-reducing and delayed-coagulation effects. The chitin bio-base high-efficiency delayed-coagulation water-reducing agent has economic and environmental protection benefits and is a novel high-efficiency water-reducing agent with great promise.
Owner:JINLING INST OF TECH
Compound containing triarylamine structure, and organic light-emitting device prepared from same
ActiveCN110577523AImprove hole transport abilityImprove thermal stabilityOrganic chemistrySolid-state devicesCrystallinityHole transport layer
The invention discloses a compound containing a triarylamine structure, and an organic light-emitting device prepared from the same. The pi conjugation effect in the compound enables the compound to have a very strong hole transport capability, and the high hole transport rate can reduce the initial voltage of the device and improve the efficiency of the organic light-emitting device; the asymmetric triarylamine structure can reduce the crystallinity of molecules, reduce the planarity of the molecules and prevent the molecules from moving on a plane, so that the thermal stability of the molecules is improved; the structure of the compound makes distribution of electrons and holes in a light-emitting layer balanced, and improves the hole injection and transport performances under a proper HOMO energy level; the structure also has an electron blocking layer under a proper LUMO energy level, so the recombination efficiency of excitons in the light-emitting layer is improved; and when thecompound is used as a hole transport layer or an electron blocking layer material of the OLED luminescent device, the triarylamine is matched with the branched chain in the structure, so the exciton utilization rate and the radiation efficiency can be effectively improved.
Owner:JIANGSU SUNERA TECH CO LTD
Preparation method of hollow microsphere calcium carbonate
InactiveCN111762807AWide variety of sourcesReduce the amount addedCalcium/strontium/barium carbonatesCalcium hydroxideMicrosphere
A preparation method of hollow microsphere calcium carbonate comprises the following steps: accurately weighing a certain amount of calcium oxide, dissolving the calcium oxide in deionized water, heating, stirring, standing for digesting, screening, and concentrating to obtain a calcium hydroxide slurry with the concentration of 2% as a raw material; transferring the prepared calcium hydroxide slurry into a high-pressure reaction kettle, adding 2-10% EDTA according to a certaub concentration molar ratio of the calcium hydroxide slurry to the EDTA, and reacting the mixed solution for 4 h at thetemperature of 80-160 DEG C and the rotating speed of 50 r.min<-1> under the condition that pure CO2 gas is introduced to make the pressure in the kettle at 1-3 MPa to obtain a product slurry; and carrying out suction filtration and washing on the product slurry, carrying out vacuum drying on the obtained solid at 80 DEG C for 10 hours, and finally grinding into powder to obtain the hollow microsphere calcium carbonate. The method has the advantages of being low in production cost, high in yield, stable in quality, good in product dispersity, environmentally friendly and the like, and is suitable for industrial production.
Owner:崇左南方水泥有限公司 +1
Early strengthening polycarboxylate superplasticizer for C30 concrete
The invention provides an early strengthening polycarboxylate superplasticizer for C30 concrete and a preparation method. The polycarboxylate superplasticizer is prepared from the following ingredients in parts by weight: 342 to 353 parts of polyether macromonomers with the molecular weight being 4000 to 4500, 22 to 27 parts of acrylic acid, 4 to 8 parts of rigid small monomers, 2 to 5 parts of 27.5-percent industrialized hydrogen peroxide, 3.5 to 6 parts of unsaturated sulfonate, 2 to 4 parts of functional phosphate monomers, 0.4 to 0.6 part of reducing agents, 1.4 to 2.4 parts of chain expanding agents, 6 to 12 parts of neutralizers and the balance water. The total mass is 100 parts. After the preparation, the mass percentage of the finished product is 40 percent; the acid-ether ratio control range is 3.9 to 4.3. The used polyether macromonomers are prepared from amidogen ether and polyether through being proportioned according to the mass ratio of 1:6; amino groups are reasonably introduced; slight soluble gypsum is promoted to be completely dissolved into water; the hydration process of C3A is accelerated; the formation of ettringite is promoted; the early strengthening effect is achieved.
Owner:HUBEI UNIV OF TECH
Preparation method of core-shell type titanium dioxide-coated carboxyl chitosan nanoparticles
ActiveCN113441182AShort cycleImprove efficiencyOrganic-compounds/hydrides/coordination-complexes catalystsChitosan nanoparticlesIonic liquid
The invention discloses a preparation method of core-shell type titanium dioxide and carboxyl chitosan nanoparticles. Anatase type nano titanium dioxide prepared by ionic liquid reaction and carboxyl chitosan are used as raw materials, and the core-shell type titanium dioxide-coated carboxyl chitosan nanoparticles are prepared through the ionic gelation effect of CTAB cation modified titanium dioxide and phosphate and the cross-linking assembly of a polymer assistant. The method disclosed by the invention is simple and convenient to operate, green and environment-friendly, the prepared core-shell nanoparticles can effectively avoid photo-corrosion of nano titanium dioxide to a carrier, and as amino and carboxyl of carboxyl chitosan can be respectively combined with photo-induced electrons and holes of nano titanium dioxide, the photocatalytic performance of titanium dioxide is remarkably enhanced, and electrostatic repulsion exists on the surfaces of the core-shell nanoparticles, so that the defect that the nanoparticles are easy to agglomerate is overcome, and the application prospect is wide.
Owner:ANHUI AGRICULTURAL UNIVERSITY
A preparation method of core-shell titanium dioxide@carboxychitosan nanoparticles
ActiveCN113441182BShort cycleImprove efficiencyOrganic-compounds/hydrides/coordination-complexes catalystsChitosan nanoparticlesO-Phosphoric Acid
The invention discloses a method for preparing core-shell titanium dioxide@carboxychitosan nanoparticles, which uses anatase nanometer titanium dioxide and carboxychitosan prepared by ionic liquid reaction as raw materials, and uses CTAB cations to modify titanium dioxide and phosphoric acid. It is prepared by the ionic gelation of salt and the cross-linking assembly of polymer additives. The method of the present invention is easy to operate and environmentally friendly, and the prepared core-shell nanoparticles can effectively avoid the photocorrosion of nano-titanium dioxide to the carrier. Since the amino group and carboxyl group of carboxychitosan can respectively combine with the photogenerated electrons and holes of nano-titanium dioxide, significantly The photocatalytic performance of titanium dioxide is enhanced, and there is electrostatic repulsion on the surface of core-shell nanoparticles, which overcomes the defect that nanoparticles are easy to agglomerate, and has broad application prospects.
Owner:ANHUI AGRICULTURAL UNIVERSITY
Preparation method of oxidation-etherification starch used as concrete water reducer
The invention relates to a preparation method of oxidation-etherification starch used as concrete water reducer. The preparation method is characterized by comprising the following steps: adding water into starch to prepare starch milk with moisture content of 20-40 percent; adjusting the pH value to 9-11; adding sodium hypochlorite as an oxidant the weight of which is 6-10 percent of the weight of the starch, mixing and reacting for 3-4h at the temperature of 35-40 DEG C under stirring; neutralizing until the pH value is 7-8; adding sodium bisulfite the weight of which is 5-15 percent of theweight of the oxidant to stop the reaction; filtering, washing and drying to obtain oxidized starch; dispersing the oxidized starch into absolute alcohol to prepare suspension with the concentration of 30-40 percent; adjusting the pH to 9-11; adding a mixed solution of oxacyclopropane and absolute alcohol and mixing; placing the mixture in an airtight reactor and reacting for 16-24h at the temperature of 40-45 EDG C under the protection nitrogen; neutralizing until the pH value is 7-8; and filtering, washing the solid with the absolute alcohol and drying to obtained the oxidation-etherification starch product. The preparation process is environmental-friendly and innocuous and has excellent performance when used as the water reducer.
Owner:SICHUAN HUASHI GREEN HOMELAND BUILDING MATERIALS
Water-based epoxy anticorrosive paint for containers, and preparation method and application thereof
InactiveCN112646455AImprove mechanical propertiesGood chemical resistanceAnti-corrosive paintsEpoxy resin coatingsEpoxyPolymer science
The invention relates to the technical field of anticorrosive paint, and in particular relates to water-based epoxy anticorrosive paint for containers as well as a preparation method and application thereof. According to the water-based epoxy resin modified by blending organosilicon in the anticorrosive paint, hydroxyl of the organosilicon and epoxy of the epoxy resin are subjected to ring-opening reaction so as to form stable Si-0-C bonds; and meanwhile, the internal stress of the system is reduced by utilizing a coupling agent, so that the compatibility of the system is improved. The mechanical properties and chemical resistance of the epoxy resin are improved. The water-based epoxy anticorrosive paint uses a high-molecular dispersing agent, and relatively strong steric hindrance and good dispersion stability are generated through the group adsorption effect of a high-molecular-weight main chain and the anchoring effect of a high-molecular polymer containing an anchoring group on the chain of the high-molecular-weight main chain; the wetting dispersity of the pigment and filler in an emulsion is improved, and the problems of pigment and filler precipitation, remarkable viscosity change and the like are solved after long-time storage.
Owner:HAOLISEN COATING SHANGHAI
Automatic feeding machine
The invention relates to an automatic feeding machine and belongs to the technical field of obliquely or perpendicularly conveying machines. The automatic feeding machine comprises a base, pushing mechanisms and a feeding table. The pushing mechanisms act on the feeding table so that the feeding table can conduct inclined movement relative to the base. The feeding table comprises a base table, a feeding rail, a feeding trolley and a trolley pushing mechanism. The feeding rail is arranged on the base table and is the movement rail for the feeding trolley. A compartment of the feeding trolley is shown at the upper portion of the base table, and a bottom plate of the feeding trolley is matched with the feeding rail to achieve the relative movement of the whole trolley. The trolley pushing mechanism is installed at the bottom of the feeding trolley and acts on the feeding trolley to enable the feeding trolley to conduct the linear movement relative to the base table. After the feeding table and a pressing table are in butt joint, materials on the whole trolley can be pushed into a trough in the pressing table directly by controlling the feeding trolley, and feeding is fast and good.
Owner:郯城超越不锈钢制品有限公司
Organic compound and organic light-emitting device
PendingCN111662317AImprove exciton utilizationImprove luminous efficiencySolid-state devicesSemiconductor/solid-state device manufacturingOrganic electroluminescenceOrganic compound
The invention provides an organic compound and an organic light-emitting device, and belongs to the technical field of organic materials. The structure of the organic compound is shown as a formula I,and the organic compound can improve the performance of the organic light-emitting device.
Owner:BOE TECH GRP CO LTD
A method of using natural chitin to prepare bio-based retarding high-efficiency water reducer
The invention relates to a method for preparing a bio-base high-efficiency delayed-coagulation water-reducing agent from natural chitin. The method comprises the following steps: degrading a natural high polymer, and carrying out functional group remolding, so as to obtain a chitosan oligosaccharide intermediate containing functional groups such as amino and hydroxymethyl; carrying out condensation reaction by virtue of phenol and formaldehyde under alkaline conditions so as to generate a phenolic aldehyde intermediate, and carrying out addition reaction by virtue of sodium hydrogen sulfite and formaldehyde so as to introduce hydrophilic sulfonic acid groups to the phenolic aldehyde intermediate; and linking the chitosan oligosaccharide intermediate with the sulfonated phenolic aldehyde intermediate by virtue of hydroxymethyl polycondensation, so as to obtain the bio-base high-efficiency delayed-coagulation water-reducing agent with good water-reducing and delayed-coagulation effects. The chitin bio-base high-efficiency delayed-coagulation water-reducing agent has the characteristics of low raw material cost, environment-friendly protection process and the like and further has relatively good water-reducing and delayed-coagulation effects. The chitin bio-base high-efficiency delayed-coagulation water-reducing agent has economic and environmental protection benefits and is a novel high-efficiency water-reducing agent with great promise.
Owner:JINLING INST OF TECH
Beneficiation reagent and of separating and recycling precious metal from cooper anode mud using method thereof
The invention belongs to the field of precious metal metallurgy, in particular to a benenficiation reagent and a using method of separating and recycling precious metal from copper anode mud. According to weight proportion, the beneficiation reagent is composed of 1-10 parts by weight of collector pinitol xanthate and pinitol aerofloat, 1-10 parts by weight of inhibitor sodium, namely, hexametaphosphate and 1-10 parts by weight of foaming agent, namely, pinitol oil. The method of separating and recycling precious metal is that first of all, acid leaching pretreatment is performed, then acid leaching residue is prepared into slurry, the slurry is added with the beneficiation reagent and rough selection is performed, then two accurate selections are performed, and precious metal ores are acquired. The benericiation reagent and the using method of separating and recycling precious metal from cooper anode mud is strong in selectivity of the beneficiation reagent, high in precious metal separating efficiency, and high in recycling rate of gold and silver, and capable of reducing cost and pollution.
Owner:NORTHEASTERN UNIV LIAONING
A compound containing triarylamine structure and organic electroluminescent device prepared therefrom
ActiveCN110577523BImprove hole transport abilityImprove thermal stabilityOrganic chemistrySolid-state devicesElectron holeHole transport layer
Owner:JIANGSU SUNERA TECH CO LTD
Organic silicon modified weather-resistant epoxy resin insulating material
The invention discloses an organic silicon modified weather-resistant epoxy resin insulating material, and belongs to the technical field of electrical insulating material preparation, wherein the insulating material is prepared by processing the components described in the claim 1. A processing method comprises the step 4 or the step 5. More stable chemical bonds with silicon atoms as the center are introduced, so that the chemical stability of the material is improved, the capability of the material for resisting chemical reactions such as thermal decomposition, oxidation and hydrolysis which enable macromolecular long chains to break in high-temperature, high-humidity and ultraviolet environments is improved, and the anti-aging capability of the material is improved; due to the hydrophobicity of introduced chemical bonds, the water absorption of the material is reduced, and the water invasion and diffusion speed is reduced; meanwhile, an introduced alicyclic structure and an introduced benzene ring structure are relatively high in stability and relatively large in steric hindrance, so that relatively good mechanical properties can be kept at a high temperature while relatively strong oxidation resistance is ensured; and due to the reserved hydroxyl, the wettability of the modified epoxy resin is relatively good, and relatively good manufacturability can be realized.
Owner:NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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