920 results about "Graft reaction" patented technology

The invention relates to the field of hot melt adhesives, and discloses a biodegradable hot melt adhesive based on castor oil and rosin resin and a preparation process thereof, the biodegradable hot melt adhesive comprises EVA resin, modified castor oil, rosin resin, a modified additive, a lubricant and an antioxidant; the modified castor oil is prepared by crosslinking castor oil and isophorone diisocyanate and reacting lignin, 1, 4-butanediol and isocyanate groups; the modified castor oil and the modified additive are added, the modified castor oil and the modified additive are added, the modified castor oil and the modified additive are added, the modified castor oil and the modified additive are added, the modified castor oil and the modified additive are added, the modified castor oil and the modified additive are added, and the modified castor oil and the modified additive are added, so that the modified castor oil and the modified additive are added, and the modified castor oil and the modified additive are added; the tensile property and the adhesive property of the hot melt adhesive are improved, and meanwhile, the flame retardant property and the high and low temperature resistance of the hot melt adhesive can be improved.

The invention discloses a medium-temperature curing high-temperature-resistant high-adhesion epoxy structural adhesive film as well as a preparation method and application thereof. The preparation method comprises the following steps: reacting high-rigidity diisocyanate with polyether polyol to obtain a polyurethane prepolymer, then adding bisphenol epoxy resin to carry out grafting reaction, and then adding carboxyl-terminated nitrile rubber to react with an epoxy group to obtain the high-temperature-resistant high-adhesion epoxy resin. And finally, mixing with a curing system and coating to obtain the intermediate-temperature curing high-temperature-resistant high-adhesion epoxy structural adhesive film. The preparation process disclosed by the invention is reasonable, and the high-temperature resistance of the adhesive film is remarkably improved by introducing high-rigidity groups such as naphthalene ring, biphenyl or p-benzene while the excellent processing property of the adhesive film is ensured; and through the synergistic effect of the polyurethane flexible chain segment and the nitrile rubber, the toughness and the adhesive property of a resin system are improved, and the loss of the resin in the forming process is reduced.

The invention relates to a waterborne polyurethane sizing agent, a preparation method thereof and a carbon fiber, and belongs to the technical field of carbon fiber preparation. The preparation method of the waterborne polyurethane sizing agent comprises the following steps: S10, dispersing and mixing amino modified polydimethylsiloxane and graphene oxide in an organic solvent, carrying out grafting reaction, and carrying out vacuum drying to obtain amino modified polydimethylsiloxane grafted graphene oxide; s20, mixing polyether glycol, diisocyanate and a hydrophilic chain extender, and carrying out a first reaction to obtain a first reaction solution; mixing the first reaction liquid, a small molecule chain extender and amino modified polydimethylsiloxane grafted graphene oxide for second reaction to obtain a polymerization system; and carrying out a neutralization reaction on the polymerization system and a neutralizer, and dispersing in water to obtain the waterborne polyurethane sizing agent. The waterborne polyurethane sizing agent can effectively increase the surface roughness of carbon fibers and improve the interfacial shear strength between the carbon fibers and a resin matrix.

The invention relates to a mussel-like polylipoic acid-based hydrogel adhesive as well as a preparation method and application thereof, and the preparation method comprises the following steps: (1) uniformly mixing a sericin solution and a caffeic acid solution, then carrying out grafting reaction to obtain a reaction solution, and carrying out dialysis treatment and drying on the reaction solution to obtain sericin grafted caffeic acid; (2) adding lipoic acid into the lithium hydroxide solution, stirring until the lipoic acid is completely dissolved, then adding sericin grafted caffeic acid, and heating for reaction to obtain a PTALi-CAS mixture; and (3) cooling the PTALi-CAS mixture, so as to obtain the mussel-like polylipoic acid-based hydrogel adhesive. The dual-network PTALi-CAS hydrogel adhesive obtained in the invention realizes wet adhesion and rapid hemostasis, has excellent comprehensive performance, and is beneficial to providing a good repair environment for wounds as a wound dressing.

The method comprises the following steps: (1) putting 1-vinyl imidazole into a flask containing N, N-dimethylformamide and D314 type resin, adding an initiator, carrying out a grafting reaction under the action of the initiator, and obtaining imidazolyl anion exchange resin after the reaction is finished; (2) pre-treating the imidazolyl anion exchange resin, and then adsorbing a rhenium-containing solution to be treated by adopting the pre-treated imidazolyl anion exchange resin; and (3) washing the imidazolyl anion exchange resin subjected to saturated adsorption in the step (2) by using ultrapure water, and then analyzing by using ammonia water to obtain a high-purity rhenium-containing solution. According to the method, the imidazolyl anion exchange resin is synthesized, the imidazolyl anion exchange resin has excellent selective adsorption capacity on rhenate ions, and efficient separation of rhenium and other impurities can be achieved when the imidazolyl anion exchange resin is applied to the rhenium-containing solution.

The invention discloses a silane cross-linked polyolefin halogen-free flame-retardant cable material and a low-energy-consumption preparation method thereof.The preparation method comprises the steps that EVA / EEA serves as a matrix, silane groups are covalently connected to a polyolefin molecular chain through a free radical grafting reaction, and a grafting material containing an active silane side group is prepared; meanwhile, vinyl isocyanate is adopted to chemically modify hydroxyl on the surface of magnesium hydroxide, vinyl is grafted to the surfaces of particles, the polarity of the particles is reduced, and the dispersity of the particles is enhanced; then carrying out melt blending on the grafted material and modified magnesium hydroxide, constructing an interface bridge by using an anhydride group, and shortening the two-phase distance; finally, through room-temperature natural cross-linking and warm water auxiliary cross-linking, silane groups are promoted to be hydrolyzed into silanol, the silanol is condensed to form a-Si-O-Si-three-dimensional network, meanwhile, vinyl on the surface of magnesium hydroxide and a polyolefin matrix are subjected to free radical copolymerization, and a covalent bond interface layer is formed between inorganic particles and an organic matrix. According to the method, the synergistic improvement of high crosslinking degree, strong stretchability and excellent flame retardance of the cable material is realized through molecular-level interface regulation and cross-linking network optimization.

The invention relates to the technical field of chinlon industrial yarns, and discloses a preparation method of a high-strength and high-toughness chinlon industrial yarn, which comprises the following steps: (1) preparing raw materials; (2) mixing the materials; (3) melt spinning; (4) stretching and heat treatment; (5) fiber surface modification; according to the invention, by fusing the advantages of high crystallization speed of nylon 6 and high melting point and high strength of nylon 66, a matrix material with good processing fluidity is formed, and the strength and fatigue cycle resistance of the chinlon industrial fiber are obviously improved. By introducing the maleic anhydride grafting agent, polar groups can be introduced among molecular chains through grafting reaction, so that the hydrogen bond density and crystallinity are remarkably improved, the molecular chains are arranged more regularly, and the tensile strength and heat resistance of the material are improved. The sea-island structure of the polyether ester elastomer effectively absorbs impact energy, so that the elongation at break is greater than or equal to 28%; the nano silicon dioxide inhibits crack propagation, and the service life of the material is remarkably prolonged.

The invention belongs to the technical field of insulator materials, and particularly relates to an insulating busbar and a preparation method thereof. The preparation method of the insulating busbar comprises the following steps: coating glue on the surface of a busbar base material, and drying to obtain a busbar with a bonding layer; the preparation method comprises the following steps: mixing 40 to 60 parts of silicon resin, 20 to 40 parts of grafted silicon dioxide, 10 to 20 parts of aluminum oxide and 2 to 4 parts of 2, 5-dimethyl-2, 5-bis-(tert-butylperoxy) hexane, so as to obtain a sizing material; placing the busbar with the bonding layer in a mold, then adding a sizing material, and pressing to obtain an insulating busbar; the preparation method of the grafted silicon dioxide comprises the following steps: stirring m-aminobenzoic acid and 3-aminopropyltriethoxysilane for reaction to obtain a grafting solution, and adding silicon dioxide into the grafting solution for grafting reaction to obtain the grafted silicon dioxide.

The invention provides an anti-compression master batch and a preparation method thereof as well as a low-compression-deformation foaming material and a preparation method thereof, and the anti-compression master batch is prepared by taking TPU (Thermoplastic Polyurethane) with carbon-carbon double bonds as a matrix, high-resilience rubber as a modifier and phenolic resin as an initiator through melt grafting reaction. The anti-compression master batch is added into a foaming material formula, the obtained foaming material is excellent in performance, the compression deformation resistance, the thermal shrinkage performance and the rebound resilience of the foaming material are greatly improved, and the foaming material has high application value.

Disclosed is a method for constructing a hydrophilic, antifouling coating on the surface of a medical implantable material. The method comprises the following steps: 1) pretreating the surface of the medical implantable material to obtain a clean surface and / or a hydrophilic active site; and 2) impregnating the medical implantable material that has been pretreated in step 1) in a precursor solution for reaction so as to obtain a reaction interface layer or a free radical reaction and / or polymerization site on the surface of the medical implantable material; and removing the medical implantable material from the solution: 3) carrying out a polymerization grafting reaction; and 4) after the reaction in step 3) is complete, performing a wash and drying, thus finishing the construction of the hydrophilic, antifouling coating on the surface of the medical implantable material. According to the present invention, an alternating-structure amino acid copolymer or a derivative thereof is used as a cross-linking agent to modify the surface of the medical implantable material, and a hydrophilic, antifouling coating is obtained. The coating has relatively good hydrophilicity and in-vivo anti-scaling properties. The hydrophilicity of the coating enables formation of a hydration layer on the surface of the material, facilitating the prevention of protein, bacteria, cells, ions, etc. from adsorption and thus achieving the anti-scaling properties.

The invention relates to the technical field of high polymer materials, in particular to high-strength and high-toughness modified plastic particles as well as a preparation method and application thereof. The preparation method of the high-strength and high-toughness modified plastic particles comprises the following steps: carrying out a reaction on MMT / CNTs and diisocyanate to prepare isocyanate-based MMT / CNTs; the preparation method comprises the following steps: reacting isocyanate-based MMT / CNTs with glycerol 1, 3-diglycerol alkyd diacrylate to prepare MMT / CNTs containing alkenyl groups; the preparation method comprises the following steps: carrying out grafting reaction on maleic anhydride, alkenyl-containing MMT / CNTs and POE (Polyolefin Elastomer) to prepare a modifier; and carrying out melt blending, extrusion, cooling and pelletizing on the modifier, the auxiliary agent and PA6 to obtain the high-strength and high-toughness modified plastic particles. The nano filler MMT / CNTs and the polyolefin elastomer POE are introduced, so that the modified plastic particles taking the PA6 as the matrix have high strength and high toughness.

The invention provides an anti-rust and anti-corrosion coating for ships and a preparation method thereof. The anti-rust and anti-corrosion coating for the ship is prepared from the following components in percentage by mass: 40 to 70 percent of epoxy emulsion, 10 to 20 percent of polyether amine curing agent, 5 to 10 percent of styryl POSS polymer, 10 to 15 percent of anti-rust filler, 10 to 40 percent of deionized water and 1 to 3 percent of additive. The added styryl POSS polymer and the epoxy emulsion are subjected to a grafting reaction to form covalent bonding, the grafting action enables the styryl POSS polymer to serve as a catenary to be combined with the epoxy emulsion, the obdurability of the coating is enhanced, the epoxy emulsion and the polyether amine curing agent are combined to act together, and the coating has the good anti-corrosion effect. The marine paint has the advantages that the marine paint is adsorbed on all oxide substrates of a ship through static electricity and a donor-acceptor interaction mechanism, so that a coating layer formed by the marine paint can fully cover the surface of the ship, a uniform and compact protective layer is formed, oxygen and molecules can be effectively isolated, and the anti-corrosion and anti-rust effects are further improved.

The invention provides a composite diaphragm for an aqueous zinc-based battery and a preparation method and application thereof, and the preparation method comprises the following steps: carrying out the following hydrophilization treatment on a diaphragm base material to obtain a hydrophilic diaphragm: placing the diaphragm base material in a grafting reactor, adding an acidizing solution with the volume concentration of 1-70%, and enabling the acidizing solution to completely immerse the diaphragm base material to obtain a hydrophilic diaphragm; the ratio of the volume of the acidizing solution to the area of the diaphragm base material is 0.01-1; the grafting reactor is sealed and heated to 30-90 DEG C for a grafting reaction, and the heating time is 2-72 h; and putting the diaphragm base material subjected to the grafting reaction into deionized water, soaking and washing for 5-120 minutes, and drying, so as to obtain the hydrophilic diaphragm subjected to grafting modification, and sequentially stacking the anti-dendritic diaphragm, the reticular binder and the hydrophilic diaphragm, and compounding to obtain the composite diaphragm. The composite diaphragm can effectively prevent the generation of battery negative electrode dendritic crystals and improve the stability of a battery positive electrode.

The invention relates to the technical field of cable materials, in particular to a flame-retardant efficient cross-linked polyolefin cable body and a preparation method thereof. The cable body comprises a polyolefin matrix, 2, 4-dihydroxy-6-methyl benzamide, an intumescent flame retardant, dicumyl peroxide, an antioxidant, a light stabilizer and a lubricant, wherein the polyolefin matrix is subjected to synergistic modification by phosphorus-nitrogen heterocyclic silane-plasma. The preparation method of the polyolefin matrix synergistically modified by phosphorus-nitrogen heterocyclic silane-plasma comprises the following steps: performing grafting reaction on polyolefin resin and phosphorus-nitrogen heterocyclic silane under the action of an initiator, and performing plasma surface treatment to endow the material with dual active sites. The preparation method comprises the following steps: melting and granulating a polyolefin matrix subjected to phosphorus-nitrogen heterocyclic silane-plasma synergistic modification, small organic molecules and auxiliaries, and performing extrusion molding under a crosslinking condition to obtain a cable body. The material disclosed by the invention has comprehensive advantages in flame-retardant efficiency, crosslinking degree and mechanical property, and is suitable for manufacturing high-safety power cables.

The invention discloses a method and equipment for detecting oxidized low-density lipoprotein based on immunoturbidimetry, and the method comprises the following steps: preparing a macroinitiator by active esterification reaction, and preparing a block graft copolymer by atom transfer radical polymerization and radical grafting reaction; the preparation method comprises the following steps: carrying out surface modification on latex microspheres with different particle sizes by using a grafted copolymer, and then respectively coupling the microspheres with different particle sizes with different OxLDL monoclonal antibodies so as to prepare a double-particle-size latex microsphere marker; and mixing the serum sample with the double-particle-size latex microsphere marker, measuring an absorbance value, and calculating the concentration of the oxidized low-density lipoprotein in the serum sample according to a standard curve established on the basis of the standard substance solution. According to the scheme, the stability of the latex microsphere marker can be enhanced, and the binding efficiency of the latex microsphere marker and ox-LDL can be improved.

The present application provides a preparation method for a filtrate reducer and the use thereof. The preparation method comprises: dropwise adding a silane coupling agent containing double bonds into a graphite dispersion under an acidic condition for grafting reaction to obtain silane-coupling-agent-modified graphite, then adding a cross-linking agent into the silane-coupling-agent-modified graphite, adjusting the pH to neutrality to obtain a first intermediate solution, mixing acrylamide, a sulfonic monomer, a cationic monomer and a monomer containing a cyclic group, then adjusting the pH to neutrality to form a second intermediate solution, finally adding an initiator into the first intermediate solution, then dropwise adding the second intermediate solution for polymerization reaction to obtain the filtrate reducer. The filtrate reducer prepared by such a method has a better high-temperature-resistant filtrate loss reduction property, and better pressure bearing capacity and plugging capacity.

The present invention discloses a separation membrane based on a reactive support layer, a preparation method and an application, and belongs to the technical field of water treatment membranes. The preparation method includes: (1) subjecting a porous support membrane to an amino grafting reaction to prepare a reactive support membrane; and (2) subjecting an aqueous phase solution and an oil phase solution containing a multi-membered acyl chloride oil phase monomer to interfacial polymerization on the reactive support membrane to prepare a separation membrane based on a reactive support layer; where an aqueous phase monomer in the aqueous phase solution is a semi-aromatic amine or an aromatic amine. In the present invention, the porous support membrane is subjected to the amino grafting reaction to obtain the reactive support membrane, and the interface polymerization is carried out on a surface of the reactive support membrane. Due to the reactive support membrane, a structure of a formed polyamide separation layer can be changed, thereby improving the water permeability of a polyamide separation membrane and maintaining an ion retention property or the ion selectivity thereof. The method of the present invention has the advantages of a simple process, low requirements for equipment and convenience in industrial production, and the prepared high-performance separation membrane has a wide application prospect in the field of water treatment.

The invention provides antibacterial carboxymethyl cellulose hemostatic gauze and a preparation method thereof.The preparation method comprises the steps that carboxymethyl cellulose gauze is soaked in a PBS buffer solution, N-hydroxysuccinimide and 1-ethyl-(3-dimethylaminopropyl) carbodiimide are added into the PBS buffer solution, and a soaking solution is obtained after uniform mixing; adding the graft modified alginate oligosaccharide into the soaking solution, mixing and stirring to generate grafting reaction, taking out the carboxymethyl cellulose gauze after the reaction is finished, washing and drying to obtain the antibacterial carboxymethyl cellulose hemostatic gauze. According to the preparation method disclosed by the invention, the catechol-grafted modified alginate oligosaccharide and partially carboxymethylated carboxymethyl cellulose gauze are subjected to amidation grafting compounding, so that the hemostatic gauze with excellent antibacterial and hemostatic properties is prepared.

The invention discloses a preparation method of a photo-thermal anti-icing and deicing super-amphiphobic coating, which comprises the following steps: firstly, adding TiN nanoparticles into a dopamine solution, so that dopamine is subjected to an auto-polymerization grafting reaction on the surfaces of the TiN nanoparticles to obtain PDA-TiN nanoparticles; dispersing the PDA-TiN nanoparticles, the SiO2 nanoparticles, the epoxy resin and the epoxy resin curing agent into absolute ethyl alcohol, adding TEOS and FAS, and dispersing; stirring the dispersion liquid twice to obtain uniformly dispersed spraying liquid; meanwhile, dispersing epoxy resin and an epoxy resin curing agent into absolute ethyl alcohol, spraying dispersion liquid onto a substrate material, and depositing an epoxy resin layer on the surface of the substrate material; and finally, uniformly spraying the spraying liquid on the surface of the epoxy resin layer, and then sequentially carrying out two times of solvent volatilization to obtain the photo-thermal type anti-icing and deicing super-amphiphobic coating loaded substrate material. A re-entering micro-nano structure and low surface energy required by the photo-thermal super-amphiphobic surface are formed on the substrate material through a spraying method and are used for preventing and removing ice.

The invention provides a water-based floating aluminum pigment and a preparation method thereof.The preparation method of the water-based floating aluminum pigment comprises the steps that an aluminum pigment and a silane coupling agent are subjected to a grafting reaction in the presence of an alkaline regulator, the silane coupling agent is grafted to the surfaces of aluminum particles, and a pretreated aluminum pigment is obtained; and carrying out polymerization reaction on the pretreated aluminum pigment, a hydrophilic monomer and a hydrophobic monomer under the condition of an initiator, and coating the surfaces of aluminum particles with an amphiphilic polymer to obtain the water-based floating aluminum pigment. According to the water-based floating aluminum pigment and the preparation method thereof provided by the invention, after the aluminum pigment is modified by using a silane coupling agent, the surfaces of aluminum particles are coated with a layer of amphiphilic polymer, so that the floating performance of the obtained aluminum pigment is improved, and meanwhile, the corrosion-resistant effect of the aluminum pigment is improved.

The invention discloses a preparation method and application of a bifunctional acrylate monomer modified polypropylene coarsening film for an extremely cold-resistant oil-immersed capacitor, and belongs to the technical field of manufacturing of electronic and electrical insulating materials. The invention relates to application of a bifunctional acrylate monomer modified polypropylene coarsened film in an extremely cold resistant oil-immersed capacitor or a thin film capacitor. The preparation method comprises the following steps: (1) respectively adding a polypropylene coarsened film, a monomer, an interface agent, a co-monomer, an initiator and deionized water in certain parts by weight into a reactor, and heating for swelling; (2) heating the reaction system to a certain temperature, and carrying out grafting reaction; and (3) washing, extracting and drying. According to the invention, the bifunctional acrylate is used as a monomer to carry out long-chain branching modification on the polypropylene coarsened film, so that the problem of poor performance of a capacitor in an extreme environment caused by low-temperature embrittlement and high-temperature insulation deterioration of the polypropylene coarsened film is solved. The method has the advantages of good effect, environmental protection, simple process, low cost and the like.

The invention discloses a preparation process and application of a modified anti-segregation admixture for machine-made sand, and relates to the technical field of polymer modified materials. Modified polyoxyethylene ether and vinyltrimethoxysilane are adopted to construct a steric hindrance effect, styrene-acrylate emulsion is introduced to form an interpenetrating network structure, and nano silicon dioxide and bentonite are cooperated to construct a multi-scale enhancement system. Silane coupling agent hydrolysis and nano grafting reaction are realized through gradient heating, and the particle size distribution D90 of the emulsion is less than or equal to 5 microns by combining an ultrasonic-mechanical synergistic emulsification process. A three-dimensional network is formed by the composite thickening agent and anhydrous sodium sulfate, and after in-situ curing at 25 DEG C with RH greater than or equal to 80%, 0.1-0.5% of the additive is added, so that the slump retention value of the machine-made sand concrete is greater than 315mm (1h), the pressure bleeding rate is less than or equal to 9.7%, the 28d compressive strength is improved by 24.5-72.6 MPa, and the segregation resistance coefficient is reduced to 0.08-0.11. The technology breaks through the limitation of insufficient adaptability of traditional admixtures to machine-made sand, and is particularly suitable for long-distance pumping construction of high-stone-powder-content machine-made sand concrete.

The invention belongs to the technical field of polyester master batches, and particularly relates to a damp-heat-resistant ultraviolet barrier polyester master batch and a preparation method thereof. The invention discloses an anti-ultraviolet polyethylene glycol terephthalate composite material, which is prepared from the following raw materials in parts by weight: 85 to 90 parts of polyethylene glycol terephthalate, 10 to 15 parts of anti-ultraviolet agent, 3 to 5 parts of epoxy-terminated polyether and 1 to 3 parts of lubricant, wherein the anti-ultraviolet agent is a modified intermediate obtained by modifying a nano light screening agent by a carboxylic ester coupling agent according to a mass ratio of (3 to 5): 100; the modified intermediate and a hydroxybenzophenone derivative are subjected to a grafting reaction according to the mass ratio of 100: (5-8); the nano light screening agent is selected from one or a combination of two or more of nano zinc oxide, nano titanium dioxide, nano cerium oxide, nano tin antimony oxide and nano carbon black. The dispersion effect of the anti-ultraviolet agent in the master batch is improved, and the ultraviolet barrier and the light transmittance are improved; meanwhile, the anti-ultraviolet agent is subjected to ester exchange with PET in the screw extrusion process, so that the interaction with PET is enhanced, migration in a humid and hot environment is avoided, and the ultraviolet shielding performance is lasting and stable.

The invention relates to a preparation method of an environment-friendly flame-retardant aluminum nitride silica gel composite film in the field of new materials, which comprises the following steps: selecting a silane coupling agent to carry out surface modification treatment on spherical aluminum nitride according to surface energy distribution characteristics, and introducing hydrophilic groups on the surface of the spherical aluminum nitride through chemical grafting reaction; a hydrophilic group is grafted on the surface of spherical aluminum nitride by adopting a silane modification method, and the hydrophilic group is hydroxyl or carboxyl, so that the surface activity and hydrophilicity are improved; mixing the silane-modified spherical aluminum nitride with a silica gel matrix to obtain dispersity data of the mixture, and judging whether the dispersity of the filler is uniform or not and the standard deviation of particle size distribution is less than 0.5 mu m; according to the dispersity data of the mixture, the filling amount of the spherical aluminum nitride is adjusted, and the heat conduction performance, thermal expansion performance and heat resistance data of the composite material under different filling amounts are obtained, so that the heat conduction coefficient of the composite material film is larger than 18 W / (m.K), the thermal expansion coefficient is smaller than 30 ppm / DEG C, and the heat resistance temperature is higher than 200 DEG C.

The invention discloses a polypropylene grafted waste vinegar residue additive for cigarettes, a preparation method and application thereof, and the preparation method comprises the following steps: firstly, dissolving waste vinegar residues for cigarettes in tetrahydrofuran; then, polypropylene grafted maleic anhydride dissolved in xylene is added into the solution for a grafting reaction, then precipitation, washing and drying are conducted, and the plasticization and compatibility integrated auxiliary agent polypropylene grafted tobacco waste vinegar residues are obtained; secondly, bamboo powder is added into tetrahydrofuran, triethylamine and phthaloyl chloride are added into the turbid liquid for a reaction, and then hydrophobic modified bamboo powder is obtained through precipitation, washing and drying; and finally, applying an auxiliary agent to melt extrusion of the polypropylene / modified bamboo powder to obtain the master batch. According to the invention, the plasticization and compatibility integrated auxiliary agent is prepared by using the waste vinegar residues for cigarettes, the technical innovation of waste reutilization is realized, and the auxiliary agent is applied to melt extrusion of polypropylene / modified bamboo powder, so that the master batch with improved mechanical properties and thermodynamic properties is obtained.

The invention discloses a preparation method and application of active cationic chitosan nanoparticles, which comprises the following steps: reacting a low-molecular chitosan triethylamine hydrogen sulfate ionic liquid ([(C2H5) 3NH] HSO4) solution with an aldehyde compound ethanol solution to form Schiff base protection on chitosan C2-site amino, and then reacting with 2, 3, 5, 6-tetramethyl-4-piperidine-2-one to obtain the active cationic chitosan nanoparticles. The preparation method comprises the following steps: carrying out nucleophilic substitution reaction on chitosan C6 in the presence of a basic catalyst by using 2, 3-epoxypropyl trimethyl ammonium chloride, then adding a chemical initiator, carrying out grafting reaction on chitosan C3 and acrylic acid, and then removing Schiff base protection on chitosan C2. Carboxylate anions of acrylic acid and cations of chitosan are subjected to cross-linking self-assembly through a hydrothermal reaction, and the chitosan nanoparticles which are high in stability, small in particle size, uniform in distribution and efficient and lasting in function are obtained. The prepared nanoparticles are high in reaction activity, contain a large amount of quaternary ammonium salt, amino dication groups and carboxyl groups, and have wide application prospects in the fields of dye adsorption, heavy metal adsorption, textile function finishing and the like.

The invention belongs to the technical field of conveying belts, and particularly relates to anti-impact type coal mine steel wire rope core flame-retardant conveying belt covering rubber and a preparation method thereof. The impact-resistant flame-retardant conveyor belt cover rubber for the steel wire rope core for the coal mine comprises the following components: butadiene styrene rubber, natural rubber, a reinforcing agent, a flame retardant, an anti-aging agent, an accelerant TMTD, an accelerant CZ, sulfur and the like, wherein the reinforcing agent is prepared from modified nano white carbon black, modified aramid fiber and zinc oxide in a mass ratio of (11-14): (4-7): (2-5). The aramid long fibers are chemically modified through self-polymerization of dopamine and a grafting reaction of a silane coupling agent, winding and crosslinking between the aramid fibers and a rubber matrix are promoted, the modified nano white carbon black, the modified aramid fibers and zinc oxide are selected to jointly form a reinforcing agent, the reinforcing agent is added into the rubber matrix, the mechanical property of the covering rubber is effectively improved, and the covering rubber is suitable for being applied to the rubber matrix. The rolling resistance of the covering rubber is reduced, and the impact resistance of the covering rubber is effectively improved by the aramid fibers.

The invention relates to the field of fluorescent whitening, and discloses a stilbene biphenyl whitening composition and a preparation method thereof, the stilbene biphenyl whitening composition comprises the following components by weight: 40-60 parts of a fluorescent whitening agent, 10-20 parts of modified montmorillonite, 3-8 parts of polyvinyl alcohol, 2-5 parts of a cosolvent, and 30-45 parts of deionized water; the modified montmorillonite is prepared by performing a grafting reaction on aminated nano montmorillonite and a polymer by utilizing a chemical reaction, and the polymer is prepared by mixing a quaternary ammonium salt antibacterial monomer, modified nano titanium dioxide, methyl methacrylate, butyl acrylate and maleic anhydride, and performing extrusion molding. According to the invention, the cotton fabric is endowed with excellent whitening effect, antibacterial property and washable effect by adding the fluorescent whitening agent and the modified montmorillonite, and the ultraviolet protection effect is good.

The invention discloses a water-soluble high cationic charge density active compound as well as a preparation method and application thereof. The water-soluble high cationic charge density compound molecule is prepared from a silane coupling agent, polyethyleneimine and a glycidyl compound. The structure of the prepared product not only contains an active siloxane group, but also contains a quaternary ammonium salt cation group and a large number of amino groups. The siloxane active groups retained on the structure of the compound can be subjected to chemical grafting reaction with the porous filter material with reactive active groups on the surface, and can also be subjected to condensation reaction in the drying process to form a polymer, so that the surface of the grafted and modified porous filter material is endowed with lasting high cationic charge density. The modified filter material has excellent removal performance on nano plastic in water, has excellent antibacterial performance, and has wide application prospects in the field of water filtration.

The invention provides a functional nanofiber material as well as a preparation method and application thereof, and the preparation method comprises the following steps: (1) adding raw materials into water to form an electrostatic spinning solution; performing electrostatic spinning to obtain a nanofiber membrane; (2) cross-linking the nanofiber membrane in an organic solvent under the catalysis of acid to obtain a cross-linked nanofiber membrane; and (3) carrying out grafting reaction on the cross-linked nanofiber membrane in a polyamine cross-linking agent, and then reacting with a sulfur-containing reagent to obtain the functional nanofiber material, the functionalized nanofiber material prepared by the preparation method disclosed by the invention combines good biocompatibility of polyvinyl alcohol, high specific surface area and high porosity of nanofiber and a synergistic adsorption effect of the polyamine cross-linking agent and cysteine, and has the advantages of large adsorption capacity, high adsorption rate, strong selectivity, good biocompatibility, stable structure and the like; the heavy metal ions in the plasma can be efficiently and safely removed, and a plurality of defects of the existing adsorption material are overcome.