818 results about "Active group" patented technology

The invention provides a diaphragm and a preparation method thereof and a lithium ion battery, the diaphragm comprises a porous support layer and a gradient functional layer, the porous support layer comprises a base membrane with the porosity of 45-60% and active groups modified on the surface of the base membrane, and the gradient functional layer comprises a heat conduction strengthening layer and an ion channel layer, the heat conduction strengthening layer comprises a first polymer and a modified boron nitride nanosheet, and the ion channel layer comprises a second polymer and a solid electrolyte nanowire. The porous supporting layer and the gradient functional layer are overlapped to form the composite diaphragm, so that high thermal stability, high wettability and high ion conductivity are synergistically realized, and formation of lithium dendrites can be inhibited.

The invention discloses low-migration UV ink-jet ink and a preparation method thereof, and belongs to the technical field of novel ink. Comprising the following components in parts by mass: 10-15 parts of a dynamic cross-linked polyurethane acrylate oligomer, 5-8 parts of an epoxy silicone resin oligomer, 2-3 parts of modified silicon dioxide, 4-5 parts of a photoinitiator, 15-20 parts of sorbic acid modified color paste, 1-2 parts of nano cerium oxide and 0.5-1 part of an antioxidant. The molecular chain of the dynamic cross-linked polyurethane acrylate oligomer prepared by the invention contains an active group capable of forming a cross-linked structure and a dynamic covalent bond. The groups and bonds promote molecular chain crosslinking when the ink is cured, a three-dimensional network is formed, and the molecular crosslinking density is improved. Through interaction of palmitic acid modified silicon dioxide and oligomer, the palmitic acid modified silicon dioxide is uniformly dispersed in a matrix and interferes molecular chain movement during curing, so that the crosslinking density is further improved, an ink film layer is more compact and firmer, the wear resistance and the scratch resistance are improved, and the tinting strength and the stability are indirectly enhanced.

The invention relates to the technical field of additives for concrete, and particularly discloses a waterproof synergistic interface agent, an interface permeation type water reducing agent mother solution, an interface permeation type water reducing agent and a preparation method of the interface permeation type water reducing agent. The waterproof synergistic interface agent is prepared from the following raw materials: organic acid modified nano inorganic powder and polyhydroxy acrylate. Through the design of the raw materials of the waterproof synergistic interface agent, the surface active groups, the adsorption performance and the dispersity of the nano inorganic powder are increased, the grafting degree of polyhydroxy acrylate with other large monomers, small monomers and functional monomers is improved, the polyhydroxy acrylate is grafted or dispersed in a water reducing agent mother solution through a polymerization reaction, and the waterproof synergistic interface agent is prepared. By combining the synergistic anti-seepage filling effect of the nano inorganic powder, the internal phase interface structure of the concrete is improved, the adhesiveness of different interfaces and the binding force of new and old concrete interfaces are increased, and the hydration hardening product can improve the compactness and toughness of the concrete and improve the ion penetration resistance and mechanical property of the concrete; the problem that an existing water reducing agent is single in function is solved.

The invention discloses a novel photocatalyst for producing hydrogen from organic matter wastewater and a preparation method of the novel photocatalyst, and relates to the technical field of photocatalysis. The photocatalyst disclosed by the invention is combined with oxidation-reduction capability, and can effectively degrade and produce hydrogen under the irradiation of sunlight. Through combination of quaternized porous tungsten oxide and vanadate radicals, silver vanadate load growth is promoted, the sunlight utilization rate is increased, and the electron-hole recombination rate is reduced. Reduced graphene oxide is used for pretreatment, active groups are introduced, the reduced graphene oxide is compounded with tungsten oxide / silver vanadate, the binding force is enhanced through heat treatment, photo-induced electron-hole pair compounding is inhibited through the conductivity, and the visible light catalytic performance is improved. The adsorption effect of porous tungsten trioxide and reduced graphene oxide can accelerate the degradation of organic matters. By optimizing the proportion of silver vanadate, tungsten oxide and reduced graphene oxide, the visible light response and charge separation efficiency are enhanced, the degradation and hydrogen production performance is improved, and light corrosion is reduced.

The invention belongs to the field of high polymer material chemistry, and particularly relates to double-network hydrogel based on sodium alginate / gelatin, a preparation method and dressing. A chemical method of grafting modification is adopted, grafting modification is carried out by designing abundant active groups on side chains of gelatin and sodium alginate, and based on traditional gelatin or sodium alginate hydrogel, not only is the thermal stability of gelatin improved, but also the biological activity of sodium alginate is improved, and the antibacterial property is achieved; the finally prepared SD / GelMA dual-network hydrogel wound dressing not only has excellent mechanical properties, but also has very high biocompatibility and antibacterial activity, and has huge application prospects and potential in the aspect of skin wound healing.

The invention relates to the technical field of plastic material preparation, and discloses a modified bamboo fiber, a PBAT composite material and a plastic object. The modified bamboo fiber comprises bamboo fiber subjected to hot pressing treatment in water and a closed aziridine cross-linking agent loaded on the bamboo fiber, and the mass ratio of the bamboo fiber subjected to hot pressing treatment in water to the closed aziridine cross-linking agent is 100: (1-10). The PBAT composite material comprises the following components in parts by weight: PBAT and modified bamboo fibers, and the mass ratio of the PBAT to the modified bamboo fibers is 100: (20-40). The modified bamboo fiber is subjected to hot pressing treatment in water, so that the generation of volatile gas caused by high-temperature processing can be avoided when the modified bamboo fiber is applied to the plastic material, and the interface interaction with the plastic material can be improved; the closed aziridine cross-linking agent can release active groups at high temperature, and can react with active functional groups such as hydroxyl and carboxyl on the surfaces of the bamboo fibers and the surfaces of the plastic materials, so that the interface interaction between the bamboo fibers and the plastic matrix is improved, and the tensile strength of the composite material is improved.

The invention discloses an all-solid-state composite dry conductive agent and a preparation method thereof, and belongs to the technical field of batteries. The all-solid-state composite dry conductive agent is prepared by the following steps: uniformly mixing carbon nanotubes, high-dispersion carbon black and graphene to obtain a primary mixture; then preparing a uniformly dispersed glue solution from the composite dispersant and water; and then adding the primary mixture into the glue solution, uniformly mixing, sanding, homogenizing, drying and crushing to obtain the product, the high-dispersion carbon black is obtained by oxidizing carbon black to form active groups such as carboxyl and hydroxyl on the surface of the carbon black, halogenating acyl and then reacting with lithium 2, 5-diaminobenzene sulfonate. The preparation method comprises the following steps: grafting histidine ester into carboxymethyl cellulose by using propylene glycol diglycidyl ester as a cross-linking agent, then introducing allyl-1, 3-sultone, then copolymerizing with lithium 2-acrylamido-2-methylpropanesulfonate and 3-aminobenzoic acid allyl ester protected by fluorenylmethoxycarbonyl, and then deprotecting to obtain the composite dispersant.

The invention discloses a polytetrafluoroethylene compensator with good corrosion resistance and a preparation method thereof.The polytetrafluoroethylene compensator is composed of a corrugated pipe, a pipe connecting flange and an end flange, the pipe connecting flange and the end flange are located at the two ends of the corrugated pipe, the corrugated pipe is composed of a lining layer and a base material layer, and the base material layer is made of stainless steel; the preparation method comprises the following steps: firstly, carrying out surface grafting on nano aluminum oxide by using isocyanate silane, and introducing an active reaction group; then part of active groups react with benzotriazole, so that the corrosion inhibition and adhesion enhancement functions are realized; finally, enabling the residual active groups to react with hydroxylated polytetrafluoroethylene activated by alkali treatment, and coating a chemical inert layer on the surface of the residual active groups; the obtained core-shell structure functional filler is dispersed in epoxy resin to prepare a coating, and after the coating is coated on a stainless steel base material and cured, a high-performance compensator with high hardness, strong adhesive force, excellent corrosion resistance and weather resistance is formed.

The invention relates to the technical field of alloys, and discloses a high-strength silver-copper alloy and a preparation method thereof. The acidified carbon nanotubes are subjected to functional modification, methylbenzene-2, 4-diisocyanate reacts with surface active groups of the methylbenzene-2, 4-diisocyanate to introduce-NCO groups, then through hydroxyl reaction of-NCO and 4-hydroxyphthalic acid, a plurality of carboxyl groups are grafted on the surfaces of the carbon nanotubes, the carboxyl groups can firmly adsorb lanthanum nitrate through a coordination effect, and meanwhile, the carboxyl groups can also adsorb lanthanum nitrate through a coordination effect. The rare earth elements are prevented from being separated from the raw materials in the ball milling process, uniform distribution is ensured, the agglomeration tendency of the carbon nanotubes can be reduced, and the dispersity of the carbon nanotubes in the silver-copper alloy is improved; the carbon nanotubes have extremely high axial strength and excellent conductivity, the mechanical and electrical properties of the alloy material can be enhanced through load transfer and a conductive network effect, rare earth lanthanum is segregated at a grain boundary to form a pinning effect to refine grains, the alloy strength is further improved, and finally collaborative improvement of the strength and the conductivity of the silver-copper alloy is achieved.

The invention belongs to the technical field of lithium ion battery positive electrode materials, and provides a plasma-assisted in-situ constructed lithium ion conductor coated high-nickel ternary positive electrode material as well as a preparation method and application thereof. Oxygen plasma active groups are formed through high-pressure ionization of oxygen, and the generated active groups interact with gas generated by thermal decomposition of an added solid source; the residual alkali on the surface of the high-nickel ternary positive electrode can be consumed, and a thin, continuous and compact lithium ion conductor coating layer with good conductivity is formed on the surface of the high-nickel ternary positive electrode material in situ, so that the development of the high-nickel ternary positive electrode material of the lithium ion battery is promoted. The high-nickel ternary positive electrode material prepared by the invention shows high specific capacity, excellent cycling stability, rate capability and first charge-discharge efficiency. Meanwhile, the preparation method provided by the invention is simple, rapid, efficient, convenient and low in cost, the residual alkali on the surface of the high-nickel ternary positive electrode material can be effectively removed, and the structural stability of the high-nickel ternary positive electrode material is improved.

The invention discloses a DNA synthesis method which comprises the following steps: processing an initial substrate according to a preset strategy to obtain a target substrate with a Mark pattern and a plurality of reaction sites, and adjusting the positions of the target substrate and an ink-jet printing device through the Mark pattern, so that the working directions of a reaction unit array and the device are consistent, and the subsequent operation accuracy is ensured; deprotecting the reaction sites to generate active groups; sequentially spraying a target monomer solution and an activator solution into the reaction sites of the preset area after deprotection treatment through an ink-jet printing device, and carrying out a coupling reaction with the active groups to obtain a mixed solution containing a nucleotide chain; carrying out cleaning, oxidation, capping and deprotection treatment on the mixed solution to obtain a single-layer base product; according to the target base sequence, determining a corresponding target monomer solution, and circularly carrying out a reaction to obtain a mixed solution containing a nucleotide chain; and obtaining the synthesized DNA according to the mixed solution. According to the method, high-throughput, high-quality and high-efficiency DNA synthesis can be realized.

The invention provides modified liquid epoxy resin, a liquid molding compound and a preparation method and application thereof, the modified liquid epoxy resin has a hard segment-soft segment-hard segment structure, the hard segment is composed of liquid epoxy resin, and the soft segment is composed of a flexible chain segment organic matter with an active group at the tail end. The liquid molding compound comprises the following components in percentage by mass: (A) 10-20% of the modified liquid epoxy resin; (B) 5-15% of a curing agent; (C) 70-90% of a filler; and (D) 0.1 to 1.5 percent of curing accelerator. The modified liquid epoxy resin provided by the invention can effectively reduce the crosslinking density, is beneficial to molecular movement, finally achieves the effects of reducing stress and shrinkage characteristics, can improve the toughness of a liquid plastic package material when being applied to the liquid plastic package material, reduces the internal stress and thermal expansion coefficient of the epoxy plastic package material, and has more excellent processability and process reliability.

The invention belongs to the technical field of building materials, and provides a cement-based composite material with an organic-inorganic interpenetrating structure and a preparation method of the cement-based composite material. According to the preparation method disclosed by the invention, the monomer and the polymer containing the active group are introduced, the in-situ polymer formed by the monomer through in-situ polymerization and the polymer containing the active group form a double-network polymer, a single-network structure is refined, and the single-network structure and a cement hydration reaction product which is synchronously performed form an organic-inorganic interpenetrating structure; the interaction between double networks and the cement-based material is enhanced, meanwhile, the microstructure is optimized, the mechanical property of the single polymer modified cement-based material can be improved, the compressive strength is improved, and the breaking strength is further enhanced; the prepared cement-based composite material with the organic-inorganic interpenetrating structure has excellent breaking strength and compressive strength.

The utility model provides a photoelectrocatalysis assisted chemical mechanical polishing device which comprises a platform, a polishing disc, a transparent polishing pad, a polishing head, a photosensitive polishing solution swing arm and an ultraviolet lamp bead, the polishing disc is rotationally connected to the upper portion of the platform, and the transparent polishing pad is arranged on the polishing disc in a stacked mode. The photosensitive polishing liquid swing arm is connected to the platform and used for spraying polishing liquid to the transparent polishing pad layer, a liquid passing hole is formed in the transparent polishing pad layer in a penetrating mode, the polishing head is connected with the positive electrode of the power source, the polishing disc is connected with the negative electrode of the power source, and the ultraviolet lamp beads are embedded in the polishing disc. According to the photoelectrocatalysis-assisted chemical mechanical polishing device provided by the utility model, the photosensitive polishing solution swing arm is used for spraying the photosensitive polishing solution, and the ultraviolet lamp beads are arranged on the polishing disc, so that ultraviolet light irradiates the photosensitive polishing solution or a wafer below the polishing head through the transparent polishing pad, and strong-oxidation active groups are synchronously generated; the oxidation rate of silicon carbide on the surface of the wafer is improved, and the polishing efficiency of the wafer is improved.

The invention discloses a bacteriostatic food packaging bag and a preparation method thereof, and relates to the technical field of food packaging, the bacteriostatic food packaging bag comprises the following components by weight: 12-22 parts of bamboo fiber; 55 to 80 parts of TPS (Thermoplastic Polystyrene); 15-20 parts of a modified ethylene composite copolymer; 15 to 20 parts of modified chitosan; wherein the modified ethylene composite copolymer is obtained by polymerizing active group-containing ethylene and one of vinyl acetate, butene, hexene or octylene according to a molar ratio of 10: (3-6); the active group is at least one of amino and sulfonic acid group; the modified chitosan is sulfo-grafted chitosan, and the mass grafting rate is greater than 0.1 wt%. The preparation method has the advantages that the compatibility of a composition formula is improved through the modified ethylene composite copolymer and the modified chitosan, a uniform net structure is formed in a cross-linking reaction to serve as a supporting framework, the overall mechanical structure performance is enhanced through the bamboo fibers which are synergistically and uniformly distributed in the composition formula, and the degradable and non-toxic effects are achieved through the cooperation of the bamboo fibers and the TPS.

The invention discloses a carbon nanotube and silver nanowire co-loaded cotton fabric, a preparation method and application, a pretreated cotton fabric is placed in a silane coupling agent solution, and after soaking treatment, washing and drying are performed to obtain a modified cotton fabric; the preparation method comprises the following steps: acidizing carbon nanotubes, and dispersing the acidized carbon nanotubes in deionized water to obtain acidized carbon nanotube dispersion liquid; the preparation method comprises the following steps: mixing a reducing agent, ferric sulfate, silver nitrate, polyvinylpyrrolidone and water, heating to react, centrifuging, washing, and dispersing a product into deionized water to obtain AgNWs dispersion liquid; the modified cotton fabric is soaked in a CNTs / AgNWs dispersion liquid prepared from the acidified carbon nanotube dispersion liquid and the AgNWs dispersion liquid, and the modified cotton fabric is taken out and dried. The cotton fabric is modified through oxysilane, active groups are introduced to the surface of the fabric, and the binding force of the cotton fabric and a conductive material is enhanced. The surface of the fiber is coated with the carbon nanotubes, the silver nanowires are in lap joint to fill gaps, the carbon nanotubes and the silver nanowires form a continuous and complete conductive network on the surface of the cotton fabric, and the conductivity is improved.

The invention relates to a preparation, regulation and control method of a thermoplastic elastomer encapsulating material in the technical field of new materials, which comprises the following steps: realizing an in-situ reaction process by controlling the concentration and reaction temperature of reactive functional groups in the encapsulating material according to an interface reaction rate constant and active group distribution density; if the reaction conversion rate reaches a preset value, a chemically bonded interface bonding layer is formed; monitoring the stress distribution state in the rubber coating layer by adopting a stress analysis algorithm, and when detecting that local stress concentration exceeds the yield strength of the material, dispersing a stress concentration area by adjusting the length of a flexible chain segment and the density of a rigid cross-linking point in a cross-linking network; and deformation data and a bonding strength change trend of the interface bonding layer in the temperature cycling process are obtained, if the bonding strength attenuation rate exceeds a preset threshold value, a dynamic cross-linking mechanism is activated, and the dynamic equilibrium state of interface bonding is maintained through fracture and recombination of a reversible covalent bond.

The invention belongs to the technical field of high polymer materials, and particularly relates to a strong-service degradable epoxy resin insulating material and a preparation method thereof. The preparation method adopts a step-by-step reaction and comprises the following steps: firstly, based on a molecular chain extension technology, carrying out fused ring series modification on epoxy resin by utilizing fused ring diol; and further grafting a flexible side chain on the resin molecular chain by taking an active group in the resin molecular chain after chain extension as a grafting site. According to the resin modification technology, the molecular chain of the resin can be extended, and the brittleness of the epoxy insulating material is improved by utilizing the chain entanglement effect of the flexible side chain; meanwhile, the electrical, mechanical and thermal properties of the epoxy insulating material are synergistically enhanced by regulating and controlling the rigidity and the flexibility of chain segments in resin molecules, improving the ordered stacking density of molecular chains in a cross-linked network and reducing the free volume ratio of the network, and meanwhile, the epoxy insulating material also has high degradation efficiency and can be widely applied to the field of insulating materials. The problem that an existing degradable epoxy insulating material cannot meet the requirement of the high-voltage electric power equipment insulation field is solved, and important technical significance is achieved.

The invention relates to the technical field of anti-aging coatings, in particular to a tire anti-aging coating and a preparation method thereof. According to the invention, the problems of poor adhesive force and poor aging resistance of a tire coating are solved; through the synergistic effect of the epoxy polysiloxane and the waterborne polyurethane-acrylate copolymer emulsion, multi-stage bonding of a tire / coating interface is realized, and the added fluorosilicone block copolymer can further form a protective barrier; by preparing modified nano silicon dioxide, active groups grafted by a silane coupling agent on the surface capture free radicals, and an oxidation chain reaction is blocked; n, N '-diphenyl-p-phenylenediamine released by the polyurea microcapsules can remove free radicals generated by oxidation in the coating, and the N, N'-diphenyl-p-phenylenediamine is matched with the compound light stabilizer to form a dynamic defense chain; a flexible long chain of the polycaprolactone polyol inhibits crack propagation through free volume filling, and the four components synergistically improve ultraviolet resistance, ozone resistance and oxidation corrosion resistance; and through a staged low temperature-medium temperature-high temperature gradient curing strategy, the adhesive force of the coating is improved.

The invention relates to the technical field of dyes, and particularly discloses a pyrimidinyl acid ornamental blue reactive dye as well as a preparation method and application thereof. According to the invention, trichloropyrimidine is introduced into the ornamental blue structure as an active group, and the reactivity of the trichloropyrimidine is lower than that of an active group of a cyanuric chloride structure, so that the pyrimidine acid ornamental blue reactive dye is more stable and not easy to hydrolyze after being combined with cellulosic fibers, the acid-resistant and alkali-resistant stability of a dye-fiber covalent bond is better, and the dyeing performance is more excellent; in addition, water-soluble groups such as a sulfonic acid group and a carboxyl group are introduced, so that the water solubility of the pyrimidinic acid blue reactive dye is improved. Moreover, the pyrimidinyl acid ornamental blue reactive dye prepared by the invention has a good dyeing effect on chemical fibers such as acrylic fibers, spandex and the like and blend fiber fabrics thereof, the adaptability of ornamental blue is further improved, the dye is stable in dyeing, deep in coloring and good in color fixing effect, meanwhile, the acid and alkali resistance of the fabrics is improved, and the pyrimidinyl acid ornamental blue reactive dye has a wide application prospect.

The invention discloses a targeted screening method and application of a xanthine oxidase inhibitor in radix puerariae, and belongs to the technical field of medicinal chemistry. A surface chemical exchange method is carried out on xanthine oxidase through a ligand fishing technology, ligands of active groups of xanthine oxidase are modified to the surfaces of magnetic metal nanoparticles, the magnetic metal nanoparticles and a to-be-separated solution are incubated together, and then specific components with the xanthine oxidase inhibiting effect are successfully screened out through a UPLC-Q-TOF-MS / MS technology. The combination of the active component and the XOD active site is verified through molecular docking simulation to confirm that the active component is an effective inhibitor. The invention provides a reliable basis for further clinical research and development of drugs for treating hyperuricemia, and has a wide application prospect.

The invention relates to the technical field of foaming materials, in particular to a shoe material preparation process for finished shoes based on supercritical physical foaming and the finished shoes. The preparation method comprises the following steps: 1) weighing a matrix, octadecyl polyhedral oligomeric silsesquioxane, an active group-containing styrene-acrylonitrile copolymer, a polydimethylsiloxane block copolymer, an epoxy functional group-containing olefin copolymer, a nano silicon dioxide dispersion and a processing aid, uniformly mixing, blending, extruding, granulating and drying to obtain a blended material, wherein the matrix, the octadecyl polyhedral oligomeric silsesquioxane, the active group-containing styrene-acrylonitrile copolymer, the polydimethylsiloxane block copolymer, the epoxy functional group-containing olefin copolymer, the nano silicon dioxide dispersion and the processing aid are mixed uniformly; the preparation method comprises the following steps of (1) preparing a polymer, (2) plasticizing the blended material to form a preformed blank, injecting supercritical gas, and fully dissolving the supercritical fluid in the polymer at the temperature of 150-180 DEG C and the pressure of 10-20MPa for 1-3 hours, (3) reducing the pressure to normal pressure within 10 seconds at the pressure reduction rate of less than or equal to 2MPa / s, and (4) cooling and shaping at the temperature of 60-80 DEG C to obtain the shoe material.

The invention discloses a preparation method of a high-temperature-resistant and high-wear-resistant bio-based waterproof moisture-permeable membrane for shoes, which comprises the following steps: step 1, preparing a high-temperature-resistant and high-wear-resistant bio-based polyurethane membrane casting solution, namely mixing bio-based polyurethane resin, wear-resistant high-specific-heat particles, a pore-foaming agent, a modifier, a coupling agent and an auxiliary agent, and uniformly stirring to obtain the high-temperature-resistant and high-wear-resistant bio-based polyurethane membrane casting solution; a uniform membrane casting solution is formed; 2, film coating is conducted through a template method, specifically, the high-temperature-resistant nanofiber skeleton is fixed to a base material, the fixed nanofiber skeleton is filled with the film casting solution, and pre-crosslinking treatment is conducted on the film casting solution through ultraviolet light irradiation; 3, gradient coagulating bath synergistic phase separation pore forming is carried out, specifically, the film layer subjected to ultraviolet light irradiation treatment is sequentially immersed into at least two coagulating baths, the first coagulating bath is used for activating covalent bond reaction of active groups on the surface of the film layer and inhibiting the phase separation rate, and the second coagulating bath is used for activating covalent bond reaction of the active groups on the surface of the film layer; the second coagulating bath is used for quickly desolvating, inducing phase separation and forming a through microporous structure; and 4, carrying out post-curing treatment on the film layer to lock the through micropore structure and complete residual crosslinking. By adopting the technical scheme, the high temperature resistance and wear resistance of the bio-based waterproof moisture-permeable film can be improved.

The invention belongs to the technical field of high polymer materials, and particularly relates to a boron nitride modified waterborne polyurethane coating with high mechanical property and a preparation method thereof. Through in-situ polymerization of dopamine on the surface of graphene oxide, abundant active groups are introduced, and covalent crosslinking of graphene oxide and waterborne polyurethane is enhanced; meanwhile, the surfactant modified boron nitride nanosheet and the coated modified graphene oxide form a three-dimensional heterostructure through hydrogen bonds and electrostatic interaction, and a multi-stage enhanced network is constructed in a polyurethane matrix. The method not only solves the problem of dispersion of the nanofiller, but also optimizes stress distribution through a brick-mud structure, and significantly improves the mechanical properties and wear resistance of the coating. Compared with traditional single filler modification, the technology realizes the synergistic breakthrough of filler-matrix interface performance and macroscopic mechanical performance, and provides a new idea for development of high-performance waterborne polyurethane coatings.

The invention discloses a bionic self-crimping material and application in the nerve field, and relates to the technical field of nano materials. The preparation method comprises the following steps: firstly, carrying out ultraviolet photopolymerization on acrylic acid and acrylic acid-N-hydroxysuccinimide, adding chitosan and glutaraldehyde to form hydrogel, and introducing epigallocatechin gallate into a chitosan-acrylic acid network. The material is rapidly and autonomously curled into a tube shape after being in contact with wet nerves, glutaraldehyde is directionally and orderly diffused by adopting a three-channel micro-fluidic chip, and the fineness is improved, so that the matching degree of nerve broken ends with different thicknesses is increased; the surface active groups of the material and the natural component chitosan cooperate to realize suture-free fixation; the plant phenol antioxidant removes free radicals at nerve injury parts; the degradation period is synchronous with natural healing of nerves, and secondary operation for taking out is not needed. The electroneurographic signals using the material are transmitted more smoothly, the target muscle atrophy degree is reduced, and the limb movement function is recovered to be close to the normal level.

The invention relates to the field of sealing materials, in particular to a heat-resistant and oil-resistant sealing gasket for an engine and a preparation method of the heat-resistant and oil-resistant sealing gasket. The liquid silicone rubber is prepared from the following raw materials in percentage by weight: 60-80% of a liquid silicone rubber base material, 15-28% of an oil-resistant heat-resistant base material, 0.1-3% of a cross-linking agent, 0.1-0.6% of a catalyst and the balance of a processing aid, the oil-resistant and heat-resistant base material is prepared from an inorganic filler, aramid pulp, polyhedral oligomeric silsesquioxane-alcoholic hydroxyl group, an activation dispersant and a double-active-group-epoxy silane coupling agent; the activation dispersant is a trihydroxymethyl caprolactone cross-linked polymer and / or bis (pinacol) borate; and the inorganic filler is composed of a plurality of components selected from fumed silica powder, nano-scale ceramic powder and zinc borate nano-powder. The oil-resistant and heat-resistant base material obtained by the scheme interacts with the silicone rubber base material, so that the prepared heat-resistant and oil-resistant sealing gasket for the engine has better comprehensive performance.

The present invention relates to a negative electrode active material and its preparation method and application. The negative electrode active material includes a silicon-carbon material and a polymer coating layer coated on the surface of the silicon-carbon material, and the material of the polymer coating layer includes a binder and a hydrophilic grafting monomer; wherein the side chain of the binder contains an end group capable of forming a hydrogen bond; any end group in the hydrophilic grafting monomer structure contains a reactive group; the minimum unit repetition number of the segment that does not contain the end group in the side chain structure of the binder is n1, and the minimum unit repetition number of the segment that does not contain the reactive group in the hydrophilic grafting monomer structure is n2, and n1 / n2 is 1.5-9.5. The negative electrode active material described in the present invention can not only be evenly dispersed in water, but also significantly reduces the gas production problem during the slurrying of the negative electrode active material and the coating of the electrode, thereby improving the quality of the electrode and the performance of the battery.

The present invention relates to the technical field of battery debinding agents, and particularly relates to a debinding agent for new energy batteries and a preparation method thereof. The present invention prepares a debinding agent for new energy batteries with a relatively fast debinding rate by compounding a bio-based composite, polyacrylic acid, a cellulose mixture, a surfactant, a solvent and an antioxidant. Among them, the carboxyl groups in the polyacrylic acid molecules interact with the charges on the surface of the colloidal particles, which can weaken the interaction between the colloidal particles and promote the aggregation of the colloidal particles; the bio-based composite and the cellulose mixture molecules contain active groups such as carboxyl groups and hydroxyl groups, which can break the chemical bonds in the adhesive, reduce the adhesiveness of the adhesive, and form intermolecular hydrogen bonds and van der Waals forces, enhance the interaction force, and improve the structural stability of the debinding agent; the raw materials used in the present invention are easily available, and have good compatibility and biodegradability, with environmental benefits. Compared with the prior art, it has a broad application prospect.

The invention discloses a phthalimidic acid hapten, an artificial antigen, an antibody, and a preparation method and application of the phthalimidic acid hapten and the artificial antigen. The structure of the phthalimide acid hapten is shown as a formula (I), and the phthalimide acid hapten is obtained by introducing a carboxyl active group with a spacer arm with a certain length to carboxyl of phthalimide acid, so that the phthalimide acid hapten can be coupled with carrier protein to obtain an artificial antigen for immunization; the phthalimide hapten retains all characteristic groups of the phthalimide, the original structural characteristics of the phthalimide are changed to the minimum extent, and a foundation is laid for generating an antibody with higher specificity and higher sensitivity for subsequently stimulating animal immune response. An artificial antigen and a phthalimide acid monoclonal antibody are prepared through the hapten, indirect competitive ELISA based on the monoclonal antibody has the lowest detection limit of phthalimide acid of 2.44 ng / mL, IC50 of 17.29 ng / mL and the linear range of 5.02-59.51 ng / mL, the detection sensitivity is high, and the linear range is wide.

The invention discloses a lignin intercalation two-dimensional nano material as well as a preparation method and application thereof, and relates to the technical field of macromolecules. The preparation method of the lignin intercalation two-dimensional nano material comprises the following steps: adding biomass powder into a deep eutectic solvent for reaction, and centrifuging after the reaction is completed to obtain an upper lignin extracting solution; adding the upper-layer lignin extracting solution into the two-dimensional nanosheet dispersion liquid, stirring, and centrifugally washing after the stirring reaction is completed to obtain a precipitate; and freeze-drying the precipitate to obtain the lignin intercalation two-dimensional nano material. According to the method, the lignin and the two-dimensional nano-material are compounded through static electricity, hydrogen bonds and pi-pi interaction by utilizing the hydroxyl and aromatic structure of the lignin, and in addition, the hydroxyl functional group of the lignin and the active group on the surface of the two-dimensional nano-sheet can jointly adsorb lead ions.