72results about How to "Facilitate the grafting reaction" patented technology

The invention discloses a preparation method of regenerated aramid composite paper. The preparation method includes: pretreating para-aramid chopped fiber, para-aramid pulp fiber and meta-aramid pulpfiber, mixing, loosening to form a uniform fiber / aqueous suspension, adding a papermaking aid into the suspension, dewatering, and molding to obtain composite aramid raw paper; dissolving the meta-aramid fiber by using organic solvent / inorganic salt solution to obtain an aramid solution, dropwise adding the prepared aramid solution into the structure of the aramid composite raw paper, putting thearamid composite raw paper into the air for regeneration, after the regeneration is completed, hot pressing the paper a high temperature and high pressure, and cleaning residual organic solvent and inorganic salt by using water to obtain high-strength aramid composite paper. The quantity of the high-strength aramid composite paper is 20 to 200 g / m2, the thickness is 10 to 300 micrometers, the mechanical strength is greatly improved, and the tensile strength is improved by 20 times.

The invention relates to a preparation method of a teflon composite substrate material and belongs to the field of organic / inorganic composite materials. The method includes the steps of firstly, oxidizing aluminum nitride ceramic powder at 800-1000 DEG C for 1-4 hours; secondly, adding the aluminum nitride ceramic powder into the mixed solution of deionized water and anhydrous ethanol, weighing acoupling agent, and evenly stirring and mixing in an ultrasonic manner to obtain a mixed material; thirdly, filtering the mixed material, and drying at 110-120 DEG C for 4-7 hours to obtain modifiedaluminum nitride ceramic powder; fourthly, placing the modified aluminum nitride ceramic powder into a powder processing cavity of 105-120 DEG C, and spraying a PTFE resin solution into the cavity ina high-pressure manner to obtain PTFE wrapped aluminum nitride powder; fifthly, adding a demulsifier to perform demulsification; sixthly, crushing; seventhly, performing cold press molding, and performing hot pressed sintering. The preparation method has the advantages that AIN powder is processed by a thermal oxidation process to oxidize the surface of the AIN powder to form a thin aluminum oxidelayer, and surface hydroxyl is beneficial to coupling agent grafting reaction.

The invention provides a rubber reinforcing agent, a preparation method thereof, and a preparation method of butadiene styrene rubber. In the invention, firstly the rubber reinforcing agent having excellent reaction activity with butadiene styrene rubber latex is synthesized in a manner of mixing an aromatic compound containing an alkene unsaturated substituent and an organic siloxane monomer containing an alkene unsaturated substituent, adding an olefin metathesis catalyst and performing a normal-temperature reaction in a methylbenzene solvent with air and water isolated, and removing the methylbenzene solvent through a vacuum desolventizer to prepare the rubber reinforcing agent. The high-strength butadiene styrene rubber is prepared by feeding the rubber reinforcing agent and the butadiene styrene rubber latex into a polymerization kettle according to ratio with addition of an initiator, and performing a reaction for a certain time with reaction temperature controlled, and coagulating, washing and drying the product.

The invention discloses a modified starch adhesive which comprises the following components in parts by mass: 100 parts of esterified starch, a right amount of alpha-amylase, 0.2-1 part of initiator, 1-4 parts of high-polymer emulsifier, 6-15 parts of polyvinyl alcohol, 70-80 parts of vinyl acetate, 10-20 parts of urea, 1-3 parts of octanol, 2-8 parts of glycerol and a right amount of water. By adding the right amount of water, the esterified starch can be made into starch milk with the starch concentration of 25-35% (m / m) on dry basis. The concentration of the alpha-amylase in the starch milk is 500-1000 ppm. The invention also discloses a preparation method of the modified starch adhesive. The bonding strength and water resistance of the modified starch adhesive are obviously enhanced. The bioenzyme is used for degradation, the material before grafting has uniform viscosity, and is beneficial to grafting reaction; and thus, the modified starch adhesive has the advantages of low cost, high safety and environment friendliness.

The invention discloses a garbage penetrating fluid efficient wastewater treating agent based on modified fly ash and a preparation method. The composition is prepared from, by weight, 50-60 parts of fly ash fine powder, 8-10 parts of dicarbonate, 11-17 parts of poly dimethyl diallyl ammonium chloride, 9-10 parts of cation polyacrylamide, 10-20 parts of carboxymethyl chitosan, 10-20 parts of quaternary ammonium salt of chitosan, 20-24 parts of smectite powder, 6-10 parts of biological bacterial sludges, 12-15 parts of magnetic tourmaline powder, 8-10 parts of basic aluminum chloride, 40-50 parts of loofahs and an adequate amount of ethyl alcohol, deionized water and water. According to the garbage penetrating fluid efficient wastewater treating agent based on the modified fly ash and the preparation method, pretreatment is conducted on coal ash powder through the dicarbonate, the porosity and the specific surface area of the coal ash power are increased, further compound modification is conducted on activation compound powder, the adsorption efficiency is increased, and the garbage penetrating fluid efficient wastewater treating agent based on the modified fly ash and the preparation method have the advantages that the adsorbent of the coal ash powder is high in capacity and easy to separate and recycle.

The invention relates to a preparation method of a high oil-absorption material based on an invasive plant. The method comprises the following steps: crushing stalk of an invasive plant-solidago Canadensis, pre-treating by an aqueous alkali and ethanol solution, adding in gelatin solution, orderly adding a hybrid reaction monomer, an initiator and a crosslinking agent, mixing under an ultrasonic cleaner to eliminate the bubble, flowing through a condensing reflow device, warming and reacting under the magnetic force stirring effect, washing by hot water after the reaction, and drying to obtain the invasive plant based oil-absorption material. The method provided by the invention is simple to operate, the ultrasonic cleaner can be used for promoting the reaction, the raw material is wide in resource, the utilized invasive plant is distributed in more than ten provinces and cities in China at present, the production cost of the product is reduced, the reclamation and environmental protection are realized, the oil-absorption multiplying power of the obtained product to the long-chain oil reaches a maximum of 25g / g.

The invention discloses an organic-inorganic hybrid hydrophilic aluminum foil coating, and a preparation method and an application thereof. According to the method, a hydrophilic polymer film-forming agent is dissolved into water according to a mass ratio of 1-99%, such that a film-forming agent solution is prepared; inorganic nano-grade particles prepared with a raw material of tetraethoxysilane, tetramethoxysilane or tetraethoxytitanium are doped in; a cross-linking agent is added; water is added for dilution, and ultrasonic dispersing is carried out, such that the mixture is well dispersed, and the organic-inorganic hybrid hydrophilic aluminum foil coating is obtained. A silane coupling agent hydrolysate is adopted as a pretreatment agent for treating a well polished and cleaned aluminum foil surface; the hybrid hydrophilic aluminum foil coating is applied on the surface of the treated aluminum foil; and the coating is cured into a film with a heat curing method, such that a hydrophilic aluminum foil is obtained. The hydrophilic aluminum foil provided by the invention has a micro-nano binary rough structure on the surface. Water can spread quickly on the surface of the aluminum foil. A water contact angle of the aluminum foil is 0-5 DEG. Hydrophilic coating adhesion force reaches 0-1 level. The hydrophilic aluminum foil provided by the invention can be applied in various air conditioners, and has an excellent comprehensive performance.

The invention discloses a gradient-structure nanometer aramid paper making method. According to the making method, a pretreatment liquid is firstly prepared, the pretreatment liquid is used to pretreat a para-aramid chopped fiber, the pretreated aramid chopped fiber and a para-aramid pulp fiber are modified by a coupling agent or a coupling agent solution, paper is manufactured with pulp, a nanometer para-aramid fiber is used to strength the gradient structure of the paper, and the strength of the prepared nanometer aramid paper with the gradient structure is 10-25 times that of base paper. The method improves the defect of the aramid paper, and a product has the characteristics of high temperature resistance, flame retardance, excellent electrical insulation property, etc.

The invention discloses a preparation method of a sericulture fiber material. The method comprises the following steps: (1) drying and crushing mulberry branches to obtain mulberry branch powder; mixing the mulberry branch powder and ion liquid to obtain a mixed solution, preserving the heat, adding additives, and stirring and heating; (2) uniformly mixing degummed silk fibers and ion liquid mixed solution, and heating; (3) mixing products of the step (1) and the step (2), heating and uniformly stirring, and facilitating the reaction; (4) washing an acquired sample by utilizing a renewable reagent, and drying solids to obtain the sericulture fiber. The sericulture fiber has characteristics of good water retention property, high heat stability, antibacterial property and environmental protection, has rigidness of the mulberry fiber and the flexibility of the silk fiber on the aspect of the physical performance; on the aspect of the biological performance, the sericulture fiber has characteristics such as smoothness, flexibility of the silk fiber and the permeability and moisturizing property of the mulberry fiber and has no allergen and immunity reaction, and the performance of the sericulture fiber is better than the mulberry fiber and the silk fiber.

The invention relates to a method of surface grafting modification for nylon fabric with a microwave irradiation method. The grafting reaction conducted with the microwave method has the advantages of short response time, uniform reaction and small influence on a property of the fabric. As hydroxyethyl methacrylate serves as a grafting monomer, the hygroscopicity of the grafted nylon fabric is improved obviously, and the dripping resistance is good; in addition, the reaction is combined with chemical bonds; an effect is stable and lasting; and the washing resistance is high.

The invention discloses a heat-resistant chlorinated polyvinyl chloride material for power cables. The raw material comprises the following components: chlorinated polyvinyl chloride, polyvinyl chloride, marble, calcium carbonate, calcined kaolin, calcium stearate, stearin Zinc acid, dibutyltin dilaurate, butyl stearate, oxidized polyethylene wax, aluminum hydroxide, magnesium hydroxide, tricresyl phosphate, bis(2‑ethylhexyl)phenyl phosphate, tris(2‑ethylhexyl) phosphate Ethylhexyl) ester, polystyrene, polyglutarimide, stearyl alcohol, silane coupling agent, antioxidant. The heat-resistant chlorinated polyvinyl chloride material for power cables proposed by the invention has high strength, good heat resistance and excellent impact resistance, and the cable material made of the material has good comprehensive performance and long service life.

The improved polypropylene / acrylic polyether ester fusion grafting process includes the following steps: 1. mixing acrylic polyether ester monomer, peroxide initiator and antioxidant at normal temperature in a high speed dispersing machine to form grafting monomer / initiator mixture solution; 2. heating the double screw extruder to reaction temperature and feeding polypropylene resin; 3. adding the grafting monomer / initiator mixture solution to the extruder with one liquid pump, so as to mix peroxide initiator, acrylic polyether ester monomer and polypropylene melt well for reaction; and 4. pumping out low molecular matter with vacuum pump, cooling the extruded melt, and palletizing to obtain the grafted polypropylene / acrylic polyether ester product. The present invention has high grafting efficiency.

The present invention belongs to the field of polymer material modification, and particularly relates to a high-fluidity metallocene low-density polyethylene resin graft, which comprises the following raw materials by weight: 100 parts of an mLLDPE resin, 0.3-0.8 part of a peroxide initiator, 3-7 parts of maleic anhydride, and 0.1-0.6 part of an antioxidant. The present invention further provides a preparation method of the graft. The preparation method comprises: feeding the materials into a co-rotating twin screw reaction extruder, and post-treating the reaction materials to obtain the grafted product, wherein the material drum of the extruder is divided into three sections, the first section is a melt mixing and dispersing section, the second reaction is a reaction section, and the third section is a metering molding section. According to the present invention, the maleic anhydride is successfully grafted onto the high-performance metallocene linear low-density polyethylene to prepare the high-fluidity metallocene low-density polyethylene resin graft, wherein the melt mass flow rate can achieve more than or equal to 15 g / 10 min, the tensile strength can achieve more than or equal to 17 MPa, and the high grafting rate is provided.

The invention discloses a nano-cellulose / polydopamine / polyethylene glycol composite material. The nano-cellulose / polydopamine / polyethylene glycol composite material is prepared by modifying the surface of nano-cellulose through polydopamine and is grafted with polyethylene glycol; the polyethylene glycol is the polyethylene glycol which is subjected to amination or sulfhydrylation modification orterminated by methoxyl. Meanwhile, the invention provides a corresponding preparation method. The nano-cellulose / polydopamine / polyethylene glycol composite material disclosed by the invention can be dispersed in polar solvents, such as water, N',N-dimethylformamide, dimethyl sulfoxide or ethyl alcohol, again; the dispersibility is high; a settlement phenomenon is avoided; the thermal stability ishigh; moreover, the composite material is only limited to modify the surface of the nano-cellulose (CNCs); the structures of nano-crystals of the CNCs are not influenced.

The invention discloses a hydrophilic modification method for polyester fibers with bromoethane and PVA and belongs to the technical field of macromolecules. According to the method, a sodium hydroxide solution is added to the polyester fibers, the mixture is stirred, heated and preprocessed, the surfaces of the polyester fibers are damaged, and subsequent modification processing is facilitated; a bromoethane solution is added to the polyester fibers, the mixture is stirred and heated and subjected to modification treatment, then a PVA solution with the mass ratio being 4-5.5% is added to the polyester fibers, the mixture is stirred and heated, and the polyester fibers obtained after hydrophilic modification is obtained. According to the method, after the sodium hydroxide solution is added for preprocessing the polyester fibers, the bromoethane solution and the PVA are utilized to conduct modification processing on the polyester fibers, and the polyester fibers good in hydrophilia and antistatic performance are obtained. The method is easy and convenient to operate, the reaction speed and the reaction temperature are easy to control, the amount of organic solvent added in the reaction process is small, low toxin, low pollution and low emission are achieved, subsequent operation is easy and convenient to conduct, industrialized popularization are facilitated, and high economic benefits are achieved.

The invention discloses grafted modified oxidized starch adhesive and a preparation method thereof. The grafted modified oxidized starch adhesive is prepared from the following components in parts by weight: 100 parts of oxidized starch, 0.4-0.8 part of initiator, 0.5-0.8 part of anionic emulsifier, 0.5-1.2 parts of nonionic emulsifier, 1-3 parts of a thickening agent, 30-50 parts of reactive grafted modified monomer, 8-12 parts of pH value regulator and 385 parts of water. The grafted modified oxidized starch adhesive has the characteristics of high adhesion strength, low moisture absorption rate, excellent moisture resistance, uniform starch pasting liquid viscosity, benefit for grafting reaction, simple process, zero VOC emission, safety, environment friendliness and the like.

The invention discloses acetoacetyl modified polyvinyl alcohol (AA-PVA) which is prepared from acetylacetic ester and PVA (Polyvinyl Alcohol) through ester exchange. Compared with polyvinyl alcohol (PVA), the acetoacetyl modified polyvinyl alcohol has relatively high reaction activity, and is used as protection colloid of emulsion polymerization of polyvinyl acetate (PVAc), the acetoacetyl modified polyvinyl alcohol is liable to cause grafting reactions, is capable of increasing the grafting rate of PVA and is capable of improving properties of PVAc emulsions. The acetoacetyl modified polyvinyl alcohol or a PVAc emulsion with the acetoacetyl modified polyvinyl alcohol as the protection colloid are liable to cause cross-linking reactions with substances such as hydrazine, hexamethylendiamine, semicarbazide, hydroxylamine or amides at a room temperature, the bonding strength of an adhesive can be remarkably improved, particularly the primary viscosity and the water resistance can be improved. By adopting the acetoacetyl modified polyvinyl alcohol, an extremely toxic substance, namely diketene, is avoided, and thus the working environment and the body health of operators are effectively ensured.

The invention relates to a method for preparing a functional polyvinylidene fluoride membrane and belongs to the technical field of separation membranes. The functional polyvinylidene fluoride membrane provided by the invention has good antibacterial properties and hydrophilicity; when titanium dioxide is subjected to photon excitation of certain energy, a photocatalytic reaction can be resulted and a large number of substances with strong oxidization can be generated, the substances with strong oxidization have a series of redox reactions with organic matter to degrade the organic matter, andas microorganisms, including viruses, bacteria and fungi, are composed of organic matter, the titanium dioxide can degrade organic components of the microorganisms under excitation of light to damageor even kill the viruses, bacteria and fungi; and according to the method, modified cellulose acetate is blended with modified polyvinylidene fluoride powder, N, N-dimethyl acetamide is adopted as asolvent, polyvinyl pyrrolidone is adopted as a modification additive, and thus the functional polyvinylidene fluoride membrane with good hydrophilicity and transmissibility is prepared.

The invention relates to the technical field of composite materials, and in particular, relates to an impact-resistant polyethylene plastic pipe and a preparation method thereof; ultrahigh molecular weight polyethylene is used as a main raw material, the surface of the ultrahigh molecular weight polyethylene is modified by an ultraviolet radiation cross-linking technology, and the polyethylene plastic pipe is prepared by adding polyethylene wax grafted polysiloxane and a quaternized nano ceramic powder processing aid, so that the defects that the ultra-high molecular weight polyethylene pipe is difficult to process and form, poorer in stress resistance and easy to crack are overcome, and the excellent impact strength of a traditional ultra-high molecular weight polyethylene pipe is reserved; the wear resistance and creep resistance are also improved, and the impact-resistant polyethylene plastic pipe is endowed with antibacterial properties; and the preparation method is sanitary, non-toxic and pollution-free, and is suitable for large-scale popularization and production.

The invention discloses cellulose-based goat milk protein fibers and a preparation method thereof. Goat milk protein is grafted to cellulose fibers by utilizing cyanuric chloride; the obtained goat milk protein fibers are milky white and warm and moist as jade; the goat milk protein fibers are rich in polar groups such as amino and carboxyl, have a good effect of neutralizing acid and alkali, can be used for rapidly removing sweat odor, have the characteristics of moisture absorption, moisture retention, damp-heat adjustment, static resistance and dust prevention, and do not irritate the skin to cause allergy; and meanwhile, a textile prepared from the goat milk protein fibers is good in rebound resilience, is smooth, glutinous and refreshing, silk-like and velvet-like in touch feeling and obviously superior to regenerated cellulose fibers in size stability, has no oppression feeling on the skin when being worn, and is skin-friendly and non-sticky to the skin.

The invention relates to the technical field of household textiles, in particular to a preparation method of an acrylic and polyester fiber blended yarn. The method comprises the following steps of (1) performing polyester modification treatment: adding persulfate, N,N-dimethylformamide and acrylamide into water, uniformly stirring to prepare a solution, then putting polyester fibers into the solution, carrying out a grafting reaction under the ultrasonic action in a nitrogen atmosphere, and then carrying out washing and drying to obtain modified polyester; and (2) mixing the modified polyester obtained in the step (1) with acrylic fibers, and spinning a mixture into the blended yarn through open-end spinning. Hydrophilic groups are grafted to the polyester fibers through the grafting reaction, so that the hygroscopicity of polyester is improved; and the modified polyester and the acrylic fibers are blended to prepare the yarn, so that the hygroscopicity and softness of the acrylic and polyester blended yarn can be further improved. A textile prepared from the blended yarn is good in hygroscopicity and softness.

The invention discloses a modified oxidized starch adhesive as well as a preparation method and an application thereof. The modified oxidized starch adhesive is characterized by being prepared from the following components in parts by weight: 100 parts of oxidized starch, 0.2-0.8 parts of an initiator, 0.5-0.8 parts of an anionic emulsifier, 0.5-1.2 parts of a non-ionic emulsifier, 1-2 parts of a thickener, 30-50 parts of a modified monomer, 6-9 parts of a stabilizer and 340 parts of water. The modified oxidized starch adhesive has high adhesion strength, low moisture absorption rate and excellent water resistance.

The invention relates to a thermoplastic soybean protein composite material and a preparation method thereof. The thermoplastic soybean protein composite material is characterized by comprising the following components by mass: 65-90 parts of thermoplastic soybean protein, 5-30 parts of polyacrylate resin, 1-5 parts of a plasticizer and 0.5 to 1 part of an antioxidant. The preparation method comprises the following steps: thoroughly mixing the above components by using a high-speed mixer; performing extrusion granulation on a blend by using a twin-screw extruder, wherein the temperature of each heating stage is set to be 160-200 DEG C in the first stage, 180-220 DEG C in the second stage, 200-240 DEG C in the third stage, 200-240 DEG C in the fourth stage and 180-230 DEG C in the fifth stage; and subjecting the granulated thermoplastic soybean protein composite material to vacuum drying at 50-80 DEG C for 12-24 h to allow water content to be no more than 0.1 wt% so as to obtain the finished thermoplastic soybean protein composite material. The thermoplastic soybean protein composite material prepared by using the method of the invention has good thermoplasticity and processing properties, excellent degradation performance, low cost, environment friendliness and great application potential.

The invention discloses St / BA copolymerization-modified oxidized starch adhesive and a preparation method thereof. The St / BA copolymerization-modified oxidized starch adhesive is made from, by weight,100 parts of oxidized starch, 0.4-0.8 part of an initiator, 2.4-4.0 parts of an oxidant, 0.35-0.5 part of a reducing agent, 0.6-1 part of an anionic emulsifier, 5-10 parts of a thickener, 20-60 partsof a copolymer modifying monomer, 6-10 parts of a PH regulator, and 350 parts of water. The St / BA Copolymerization-modified oxidized starch adhesive of the invention has the advantages that, for instance, the adhesive has high adhesive strength, low moisture absorption rate, excellent waterproofness and excellent breaking strength, has good viscosity uniformity in gelatinized state and is good for grafting reaction, and the process is simple, free of VOC (volatile organic compound) emission and is good in safety and environmental friendliness.

The invention provides bamboo powder / poly(butylene succinate) / starch biodegradable plastic and a preparation method thereof. The bamboo powder / poly(butylene succinate) / starch biodegradable plastic provided by the invention comprises the following components in parts by weight: 15-25 parts of bamboo powder, 30-45 parts of poly(butylene succinate), 15-25 parts of starch, 12-20 parts of talcum powderand the like. The bamboo powder / poly(butylene succinate) / starch biodegradable plastic prepared by the invention is wide in raw material source and safe, does not contain any chemical additive with toxic and side effects, can be used for producing disposable tableware products such as knives, forks, spoons, cup covers, straws, bowls and lunch boxes, can be completely degraded after being used, andis short in degradation period.

The invention belongs to the field of wood-plastic composite materials, and relates to a polyolefin / polystyrene blend-based wood plastic composite material and a preparation method thereof. The preparation method of the polyolefin / polystyrene blend-based wood plastic composite material comprises the following steps: dissolving an initiator and maleic anhydride in acetone for preparing a solution, uniformly mixing the solution with the polyolefin / polystyrene blend, storing in an open manner for completely volatilizing the solvent; adding wood fiber, the stearic acid and the styrene into a high-speed mixer, uniformly mixing, adding the mixed plastic mixture, and uniformly mixing; and adding the mixed materials into a double-screw extruder, and extruding to obtain the polyolefin / polystyrene blend-based wood plastic composite material. The interface adhesion between a plastic base body and the wood fiber in the wood-plastic composite material, and the compatibility between the plastic components polyolefin and the polystyrenes are improved, so that the tensile strength and impact strength of the composite material are improved. Moreover, the preparation method of the polyolefin / polystyrene blend-based wood plastic composite material has the advantages of being simple in process, high in generating efficiency and low in cost.

The invention relates to a self-cleaning cotton fiber and a preparation method thereof. The preparation method comprises the following steps: adding nano titanium dioxide, methacrylic acid and ceric ammonium nitrate into ethanol, carrying out grafting reaction in an inert gas atmosphere, filtering, washing and filtering to obtain a solid, and drying; adding the obtained methacrylic acid modified nano titanium dioxide and ceric ammonium nitrate into ethanol; soaking the cotton fiber in water, drying, placing the cotton fiber in the mixed solution in an inert gas atmosphere, carrying out grafting reaction, washing, and carrying out secondary drying. According to the invention, methacrylic acid is grafted to nano titanium dioxide through a grafting reaction to obtain methacrylic acid modified nano titanium dioxide, and then the methacrylic acid modified nano titanium dioxide is grafted to cotton fibers through the grafting reaction, that is, the nano titanium dioxide is introduced into the cotton fibers through chemical bonds; the bonding strength of the nano titanium dioxide and the cotton fibers is improved, so that the self-cleaning performance and the washable stability of the fabric are improved.