29results about How to "Good char formation" patented technology

The invention discloses gel foam for preventing spontaneous combustion of coal, and belongs to the technical field of gel foam fire extinguishing. The gel foam comprises the following components: 0.1-0.5% of a composite foaming agent, 5-15% of a gelling agent, 0.1-0.5% of a cross-linking agent and the balance of water, the composite foaming agent is sodium lignin sulfonate and sodium fatty alcohol polyoxyethylene ether carboxylate; the gels are silica sol and sodium alginate. The gel foam has excellent water-retaining property, and can relieve water loss and weight loss of coal; the flame retardant can effectively hinder the contact between coal and oxygen, interrupt the free radical chain reaction of coal and avoid the oxidation weight gain of coal, and has an excellent flame retardant effect; in the combustion process, less heat is generated, and the smoke suppression effect is excellent. The gel foam does not contain antioxidants and flame retardants, can avoid environmental pollution, is an environment-friendly anti-oxidation gel foam, and can be used as an efficient fire preventing and extinguishing material in the field of preventing spontaneous combustion of coal.

The invention belongs to the technical field of flame-retardant materials, and particularly relates to a halogen-free flame retardant containing a Schiff base structure, a preparation method of the halogen-free flame retardant and application of the halogen-free flame retardant in epoxy resin. An intermediate is prepared through nucleophilic substitution reaction between an aldehyde group-containing phenolic compound and an acyl chloride compound, and a halogen-free flame retardant containing phosphorus and nitrogen elements and a Schiff base structure is obtained through Schiff base reaction between the intermediate and 1, 3-bis (3-aminopropyl)-1, 1, 3, 3-tetramethyldisiloxane. The flame retardant combines a Schiff base structure, phosphorus and silicon elements, and has the advantages of good thermal stability, significantly improved char yield, excellent flame retardant effect and significantly improved mechanical properties. The modified epoxy resin is further used for modifying the epoxy resin to prepare the flame-retardant epoxy resin; under the condition that the influence on the thermal performance of an epoxy resin cured product is small, the charring performance and the mechanical performance of the epoxy resin cured product can be remarkably improved, and the flame-retardant efficiency is excellent.

The invention relates to the technical field of flame-retardant modified glass fibers, and discloses flame-retardant modified glass fiber reinforced flame-retardant PBT (polybutylene terephthalate) and a preparation method and application thereof.The flame-retardant modified glass fiber reinforced flame-retardant PBT is prepared from, by mass, 20-70 parts of PBT resin, 15-30 parts of GF-NH2-FR, 2-5 parts of polyphosphate, 5-10 parts of hypophosphite, 1-5 parts of flexibilizer, 0.1-1 part of flame-retardant synergist, 0.1-2 parts of nucleating agent, 0.1-2 parts of lubricant and 0.1-1 part of antioxidant. The GF-NH2-FR is glass fiber modified by using a flame retardant, namely, hydroquinone modified phenyl phosphoryl dichloride. According to the flame-retardant PBT material disclosed by the invention, the mechanical property of the material is ensured while the candlewick effect of the material is inhibited by integrally optimizing the composition and the preparation process of the flame-retardant PBT material.

The invention discloses a high-impact-resistance thin-wall flame-retardant polycarbonate material, which is prepared from the following raw material components in parts by mass: 84.5 to 95 parts of polycarbonate, 0.5 to 1.5 parts of sulfonate flame retardant, 2 to 5 parts of phosphorus flame retardant, 1 to 5 parts of aminated polyacrylonitrile, 0.1 to 1 part of mesocarbon microbeads, 1 to 5 parts of toughening agent and 0.1 to 0.5 part of antioxidant, wherein the notch impact strength of the polycarbonate is greater than or equal to 80kJ / m < 2 >, and the melt index of the polycarbonate is 0.5-3g / 10min under the test conditions of 300 DEG C and 1.2 kg. According to the high-impact-resistance, thin-wall and flame-retardant polycarbonate material and the preparation method thereof, the high-impact-resistance, thin-wall and flame-retardant polycarbonate material has excellent stability and flame retardance and has wide application scenes.

The invention relates to the technical field of high polymer materials, and discloses a graphene-filled nylon high-thermal-conductivity composite material and a preparation method thereof, quaternary ammonium salt in a phosphorus-nitrogen quaternary ammonium salt polyamide structure can generate non-covalent bond combination with carboxyl and hydroxyl of graphene oxide through electrostatic interaction to realize grafting modification with graphene; the graphene is used as a filler to be filled into a nylon 6 matrix, and sheet layers of the graphene are overlapped together, so that a constructed heat conduction path is more complete, heat conduction is more continuous, and the heat conduction performance of the composite material is greatly improved; a triazine structure in the phosphorus-nitrogen polyamide modified graphene is decomposed at a high temperature to generate a nitrogen-containing compound which can promote carbonization of nylon 6, and a phosphoric acid structure is heated to form polyphosphoric acid which serves as an acid source and promotes carbonization; the graphene sheet layer can prevent the nylon material from deformation caused by external force, so that a skeleton supporting effect is achieved, and the mechanical property of the composite material is further improved.

The invention relates to the technical field of new materials, and discloses a flame-retardant functionalized carbon nanotube modified polyethylene material, which is characterized in that organic functional groups and starch macromolecules are introduced to the surfaces of carbon nanotubes, so that the intermolecular distance of the carbon nanotubes is increased, the agglomeration phenomenon of the carbon nanotubes is inhibited, and the flame-retardant functionalized carbon nanotube modified polyethylene material is prepared. According to the present invention, the carbon nano-tubes are introduced into the polyethylene, such that the carbon nano-tubes can be easily dispersed, the carbon nano-tubes can provide the good mechanical property enhancing effect on the polyethylene, the phosphorus element is introduced on the surfaces of the carbon nano-tubes, the starch having the excellent char forming property is introduced, and the flame-retardant phosphoric acid, the flame-retardant polyphosphoric acid and the like can be formed during combustion so as to promote the char forming of the starch and the polyethylene; according to the present invention, the carbon layer with the barrier property is rapidly formed, and the barrier carbon layer can isolate oxygen and heat so as to prevent the further combustion of the polyethylene material, such that the flame retardation self-extinguishing effect is provided so as to obtain the polyethylene material with characteristics of good flame retardation and good mechanical property.

The invention relates to the technical field of new materials, and discloses a flame-retardant modified halloysite grafted waterborne polyurethane material, three flame-retardant elements N, P and S are introduced to the surface of halloysite, so that the obtained waterborne polyurethane material has excellent flame-retardant property, the surface of a halloysite tube is organically modified, and the flame-retardant property of the halloysite tube is improved. The self-agglomeration of the halloysite nanotubes can be effectively inhibited, and meanwhile, the halloysite enables a polyurethane molecular chain to be grafted on the halloysite in situ through the terminated hydroxyl, so that the dispersity of the halloysite in a polyurethane matrix can be effectively enhanced, a cross-linking center is formed, the compatibility of the polyurethane and the halloysite at a molecular level is achieved, and the self-agglomeration of the halloysite nanotubes can be effectively inhibited. The halloysite is added, so that the microphase separation structure of the composite material is influenced, the mechanical property of polyurethane is improved, the halloysite with high length-diameter ratio can effectively limit the movement of a polyurethane molecular chain, and the thermal stability of the composite material is improved.

The invention relates to the field of silicon resin, in particular to benzocyclobutene modified phenyl silicon resin and a preparation method thereof, which are used for solving the problem that the application of the existing silicon resin in a high-temperature environment is limited due to poor high-temperature resistance, ablation resistance and charring performance of the existing silicon resin. The benzocyclobutene modified phenyl silicone resin contains a large number of benzene rings, so that the benzocyclobutene modified phenyl silicone resin is endowed with excellent high-temperature resistance, the thermal stability of the benzocyclobutene modified phenyl silicone resin is further improved after a benzocyclobutene structure is introduced, and the molecular structure of the benzocyclobutene modified phenyl silicone resin further contains a large number of phosphorus-containing structures and nitrogen-containing structures, so that the benzocyclobutene modified phenyl silicone resin can form more carbon protection layers during combustion, and the service life of the benzocyclobutene modified phenyl silicone resin is prolonged. The purposes of flame retardance and ablation resistance are achieved; the benzocyclobutene modified phenyl silicone resin has excellent high temperature resistance, ablation resistance, flame retardance and char forming performance and can be widely applied to the fields of aerospace, electrical industry, semiconductor packaging and the like, and the preparation method is simple, easy to operate and suitable for industrial production.

The invention discloses a fine-grained piperazine polyphosphate flame retardant, wherein the particle size D50 of the fine-grained piperazine polyphosphate flame retardant is less than 20 μm; the invention also discloses a preparation method of the fine-grained piperazine polyphosphate flame retardant, wherein acetic acid is first added to a reaction device, piperazine is added under stirring conditions, and the temperature is increased; polyphosphoric acid is added, stirred, and reacted at 100 to 110° C.; the fine-grained piperazine polyphosphate flame retardant is obtained by cooling to room temperature, filtering, and drying. The method can directly prepare a piperazine polyphosphate flame retardant with a relatively fine particle size, and the product can be used after drying without undergoing a pulverization process, and the acetic acid filtrate obtained by filtering after the reaction can be directly used for the next reaction without treatment.

The invention relates to the technical field of HDPE resin, and discloses flame-retardant high-toughness HDPE resin and a preparation method thereof.The flame-retardant high-toughness HDPE resin is prepared through the steps that phosphonitrilic chloride trimer, 4, 5-diamino-o-diphenyl nitrile, hydrazine hydrate and the like serve as raw materials, an intermediate 2 is obtained through a reaction, amino in the intermediate 2 and vanillic aldehyde are subjected to condensation to obtain vanillic aldehyde cyclotriphosphazene, and the vanillic aldehyde cyclotriphosphazene is subjected to flame retardant modification to obtain the flame-retardant high-toughness HDPE resin. The flame-retardant and high-toughness HDPE resin is prepared by the following steps: by taking 3-isocyanate propyl triethoxy silane as a bonding arm, reacting with an intermediate 2 and attapulgite to obtain attapulgite-based cyclotriphosphazene, and finally adding vanillin cyclotriphosphazene and the attapulgite-based cyclotriphosphazene into HDPE (High-Density Polyethylene) to melt, blend and press, thereby obtaining the flame-retardant and high-toughness HDPE resin. The HDPE resin prepared by the invention has excellent flame retardant property, heat resistance and mechanical property.

Belonging to the technical field of flame retardant materials, the invention discloses a fireproof flame retardant polymer composite material, which comprises the following components by weight: 20-60 parts of polyamide, 10-50 parts of polyurethane, 2-10 parts of a synergistic flame retardant, 1-5 parts of a lubricant, 1-2 parts of an antioxidant, and 1-5 parts of an anti-aging agent. The binaphthol phosphate provided by the invention contains a phosphorus-containing seven-membered macroring, and a triazinyl group and a carbazolyl group which are contained on 9, 9 '-(6-chloro-1, 3, 5-triazine-2, 4-diyl) bis (9H-carbazole), and a plurality of large steric hindrance groups with non-coplanar structures are introduced into a synergistic flame retardant through the reaction of the triazinyl group and the carbazolyl group; the thermal stability and the flame retardant property of the composite material are improved through heterocyclic groups on the heterocyclic diamine monomer, and the synergistic flame retardant effect of nitrogen and phosphorus elements is fully exerted; the composite material has good char forming capability and molten drop resistance; the synergistic flame retardant and the matrix have excellent compatibility, the problem that the mechanical property is reduced due to addition of a traditional flame retardant is effectively prevented, the structural rigidity of the material is improved through the synergistic flame retardant, and the overall mechanical strength of the composite material is enhanced.

This invention discloses an intrinsic flame-retardant epoxy resin containing phthalonitrile and Schiff base structures, its preparation method, and its applications, belonging to the field of flame-retardant polymer materials technology. The intrinsic flame-retardant epoxy resin of this invention simultaneously contains phthalonitrile units, Schiff base units, and epoxy functional groups in its molecular structure. Its preparation method includes: obtaining an intermediate through a nucleophilic substitution reaction of nitrophthalonitrile with aminophenol, followed by Schiff base condensation with dihydroxybenzaldehyde, and finally reacting with epichlorohydrin to introduce epoxy groups. This resin combines the condensed-phase charring effect of phthalonitrile with the gas-phase flame-retardant effect of Schiff bases, producing a synergistic effect. When used as an intrinsic resin or additive in epoxy resin compositions, as an intrinsic resin, the cured product exhibits excellent flame-retardant properties. As an additive, it can improve the flame retardancy and mechanical properties of epoxy resin while maintaining thermal properties, exhibiting excellent flame-retardant efficiency.

The present invention belongs to the field of rubber technology, and specifically discloses a flame retardant rubber composition and a preparation method thereof. The raw materials of the flame retardant rubber composition include: butadiene rubber, methyl vinyl silicone rubber, stearic acid, zinc oxide, antioxidant, antioxidant, sulfur, accelerator, white carbon black, cross-linking auxiliary agent, and flame retardant for rubber. The flame retardant rubber composition prepared by the present invention not only has good flame retardant properties, but also has good mechanical properties.

This application provides a charging pile sheath composite material, made from at least the following raw materials in parts by weight: 60-80 parts of thermoplastic polyurethane elastomer, 5-15 parts of polyketimide, 10-20 parts of halogen-free flame retardant additives, and 1.5-3.0 parts of functional additives. This application also provides a method for preparing the charging pile sheath composite material, comprising the following steps: S1, melt-blending polyketimide with thermoplastic polyurethane elastomer or thermoplastic polyester elastomer, and granulating to obtain a pre-dispersed masterbatch; S2, melt-blending the pre-dispersed masterbatch, the remaining thermoplastic polyurethane elastomer, halogen-free flame retardant additives, and functional additives, and granulating to obtain the charging pile sheath composite material. The charging pile sheath composite material and preparation method provided in this application, by optimizing the raw material composition and ratio and the two-step processing technology, utilizes the dispersing and self-lubricating properties of polyketimide, combined with the flame-retardant synergistic effect of the halogen-free flame retardant additives, to improve the flame-retardant and wear-resistant properties of the charging pile sheath composite material.

The invention discloses a halogen-free flame-retardant polypropylene composite material with high boiling resistance and low smoke generation and a preparation method of the halogen-free flame-retardant polypropylene composite material. The flame-retardant polypropylene composite material comprises polypropylene, and a hydrophobic phosphorus-nitrogen intumescent flame retardant is dispersed in the polypropylene; the hydrophobic phosphorus-nitrogen intumescent flame retardant is a phosphorus-nitrogen intumescent flame retardant of which the surface is coated with a vesicle structure, and the vesicle structure is a self-assembly structure obtained after an alcoholysis reaction of a sulfur-containing silane compound and the phosphorus-nitrogen intumescent flame retardant. The flame retardant with the vesicle structure can keep good water resistance and compatibility with a polypropylene matrix in a high-humidity-heat environment, the precipitation amount of the flame retardant after high-temperature water boiling can be reduced, and the migration and precipitation problems of the flame retardant in the polypropylene matrix are effectively solved. Meanwhile, the vesicle structure can also improve the thermal stability and char forming performance of the flame-retardant polypropylene and improve the barrier effect on heat and combustible gas in the combustion process, and compared with common flame-retardant polypropylene, the total released heat is reduced by 24.0%, and the carbon residue mass is increased by 51.7%.

This invention discloses an organosilicon-boron flame retardant, its preparation method, and its applications. This material exhibits excellent flame retardant properties and good light transmittance. The invention also provides a method for preparing this organosilicon-boron flame retardant, which is simple to operate, uses widely available raw materials, is low in cost, and can be applied to large-scale industrial production.

The invention relates to high-manufacturability plastic for an extension socket track and a preparation method of the high-manufacturability plastic, and belongs to the technical field of plastic. The preparation method comprises the following steps: creatively adding 2, 4, 6-triaminopyrimidine and phytic acid into deionized water to form a reaction system, carrying out a hydrothermal reaction, reacting amino of 2, 4, 6-triaminopyrimidine with phosphorus hydroxyl of phytic acid to obtain an N-P composite product, adding a certain amount of diphenyl chlorophosphate, and carrying out a hydrothermal reaction to obtain the 2, 4, 6-triaminopyrimidine / phytic acid composite material. The preparation method comprises the following steps: mixing a first flame retardant with 3-benzenesulfonyl potassium benzenesulfonate, polyvinyl butyral and polycarbonate according to a certain mass ratio, and carrying out extrusion granulation to obtain the plastic, so as to realize deacidification substitution of residual amino groups and phosphorus-chlorine bonds, thereby preparing a second flame retardant, and mixing the second flame retardant with the first flame retardant / 3-benzenesulfonyl potassium benzenesulfonate, polyvinyl butyral and polycarbonate according to a certain mass ratio. Compared with the prior art, the flame retardant polycarbonate has the advantages of low viscosity during melting, good fluidity, easy processing, strong manufacturability, excellent flame retardant effect, no adverse effect on the mechanical properties of polycarbonate, and suitableness for application in the field of extension socket tracks.

The present invention relates to the technical field of polycarbonate, and discloses a flame-retardant modified polycarbonate material and a preparation process of a glass fiber composite material, including 100 parts by weight of polycarbonate, 0.05-0.3 parts by weight of hexa(sulfonic acid carbazole aniline) cyclotriphosphazene, and 2-20 parts of quaternary ammonium salt modified glass fibers; the present invention modifies the hexa(sulfonic acid carbazole aniline) cyclotriphosphazene flame retardant to the surface of the glass fiber. The two form a flame-retardant glass fiber composite material, which significantly improves the limiting oxygen index of polycarbonate, and the UL94 fire rating reaches V-0 level. The modified glass fiber surface is modified with an organic functional group, which improves the compatibility with polycarbonate, so that the glass fiber can be evenly dispersed in a polycarbonate matrix, and its reinforcing effect is more effectively exerted, thereby improving the tensile strength and flexural modulus of the polycarbonate.

The present invention provides a flame retardant vinyl ester resin monomer, an intrinsic flame retardant vinyl ester resin cured product and a glass fiber reinforced flame retardant vinyl ester resin composite, and relates to the technical field of flame retardant materials. The structure of the flame retardant vinyl ester resin monomer provided by the present invention contains a -C=N- bond and an aromatic structure, and has good charring performance and high rigidity; and the monomer contains a -CH2-CH-CH2- structure, which helps to improve the bending strength of the resin; at the same time, the monomer contains a hydroxyl group, so that the resin has a good impregnation effect on the glass fiber. The intrinsic flame retardant vinyl ester resin cured product obtained by using the flame retardant vinyl ester resin monomer provided by the present invention has both low heat release and smoke release, and excellent mechanical properties; the glass fiber reinforced vinyl ester resin composite prepared by using the flame retardant vinyl ester resin monomer has a higher limiting oxygen index, lower heat release and smoke release, and better mechanical properties.

The invention discloses an ethylene-vinyl acetate copolymer composite material and a preparation method thereof, relates to the field of high polymer materials, and aims to solve the problems of lower flame-retardant efficiency and poorer water resistance and smoke suppression property of the existing flame-retardant modified EVA flame retardant. The composite material comprises an ethylene-vinyl acetate copolymer, a flame retardant, a synergist, a compatibilizer, a lubricant and an antioxidant. The method comprises the following steps: 1, firstly adding the flame retardant, the synergist, the compatibilizer, the lubricant and the antioxidant into a high-speed mixer, uniformly mixing, then adding the ethylene-vinyl acetate copolymer, and continuously uniformly mixing to obtain a mixed material; and 2, adding the mixed material into an internal mixer, heating, melting and blending, and carrying out compression molding to prepare the ethylene-vinyl acetate copolymer composite material. The EVA composite material which is efficient in flame retardance, low in smoke release, waterproof and good in mechanical property is prepared, and the requirements for the high-performance flame-retardant EVA composite material in different fields of electric wires, cables, traffic transportation and the like are met.

The application belongs to the field of textile fibers, and particularly relates to a phosphorus-nitrogen-silicon flame retardant for viscose fibers and application thereof. The preparation raw materials comprise a phosphorus-nitrogen-silicon flame retardant, a surfactant A, a surfactant B and water, the phosphorus-nitrogen-silicon flame retardant is obtained by modifying a double-end amino siloxane p-dithio pyrophosphate flame retardant, and the concentration is 20-50 wt%; the surfactant A is polyacrylamide, and the concentration is 0.1-1 wt%; the surfactant B is one or a combination of two or more of fatty alcohol polyoxyethylene ether, phenyl phenol polyoxyethylene ether, castor oil polyoxyethylene ether and fatty amine polyoxyethylene ether, and the concentration is 1-8 wt%. The three-element synergistic flame retardant reduces the addition amount in the viscose fibers, effectively improves the spinneret blockage, and reduces the influence on the mechanical properties of the fibers. In the flame-retardant dispersion liquid, the polyacrylamide macromolecular dispersant is selected, the crosslinked network structure can effectively prevent the loss of the flame retardant in the spinning process, and the washing resistance of the flame-retardant fiber is improved.

The invention belongs to the field of waterproof coiled materials, and discloses a composite flame retardant, a waterproof layer and an environment-friendly flame-retardant macromolecular self-adhesive waterproof coiled material. The composite flame retardant is prepared by mixing, stirring and granulating an intumescent flame retardant and a composite ultrafine metal hydroxide; the intumescent flame retardant is prepared by mixing and stirring modified starch and a polymer flame retardant; the composite superfine metal hydroxide comprises the following components: magnesium hydroxide and aluminum hydroxide. The environment-friendly flame-retardant macromolecular self-adhesive waterproof coiled material provided by the invention has the advantages of high flame retardance, high strength, impact resistance, acid and alkali chemical medium corrosion resistance and low temperature resistance.

The invention relates to the field of flame retardant preparation, in particular to a sulfuryl-containing polysilsesquioxane compound and a preparation method thereof, and the compound is suitable for being used as a flame retardant in polycarbonate materials. The invention discloses a sulfuryl-containing polyorganosilsesquioxane, the compound has an RSO2CH2CH2SiO1.5 unit, and the structure of the compound is as follows: # imgabs0 #, in which R is equal to C4H9 and C8H17. The invention further discloses a preparation method of the sulfuryl-containing polyorganosilsesquioxane. Vinyltrimethoxysilane and mercaptan which are rich in source and low in price are used as reactants, free radical addition, oxidation and hydrolytic condensation reaction are carried out, novel polysilsesquioxane containing sulfuryl is obtained, reaction conditions are mild, and the yield is high.

This invention provides a flame retardant for water-based fire-retardant coatings for steel structures, prepared from the following raw materials: urea, phosphoric acid, acidic lignin, and pentaerythritol; the weight ratio of urea, phosphoric acid, acidic lignin, and pentaerythritol is 1:(0.8-1):(0.1-0.5):(0.01-0.05). Applying this flame retardant to water-based fire-retardant coatings for steel structures achieves both moisture resistance and flame retardancy.

The invention relates to the technical field of lithium ion batteries, and discloses a preparation method and application of a high-capacity activated carbon-based electrode material, hyperbranched polycarbonate polyurethane and potassium hydroxide are ground and blended, calcined in a tubular furnace, cooled, washed with water and dried, and the high-capacity activated carbon-based electrode material is obtained. The hyperbranched polycarbonate polyurethane contains a large amount of nitrogen and sulfur elements, nitrogen and sulfur co-doped porous activated carbon is formed after high-temperature carbonization, active sites such as pyrrole nitrogen, pyridine nitrogen and thiophene sulfur are generated, the conductivity is improved, the pore structure is improved, the lithium storage sites are increased, the porous structure is beneficial to promoting transmission of lithium ions and electrons, and the lithium storage capacity is improved. Therefore, the charge-discharge specific capacity and the capacity retention ratio of the electrode material are improved, and the electrode material has better specific capacity and cycling stability.

The invention discloses a water-resistant low-smoke intumescent flame-retardant polyethylene composite material and a preparation method thereof, relates to the field of high polymer materials, and aims to solve the problems of relatively large flame retardant addition amount and relatively poor water resistance and smoke suppression performance in the modification process of an existing polyethylene flame retardant. The composite material comprises polyethylene matrix resin, a flame retardant, a synergist, a compatibilizer, a lubricant and an antioxidant. The method comprises the following steps: 1, mixing the flame retardant, the synergist, the compatibilizer, the lubricant and the antioxidant, then adding the polyethylene matrix resin, and continuously mixing to obtain a mixed material; and 2, adding the mixed material into a twin-screw extruder, carrying out melt blending, extrusion, cooling, air drying and granulation through the extruder, and then preparing the water-resistant low-smoke intumescent flame-retardant polyethylene composite material through an injection molding machine. The polyethylene composite material prepared by the invention has excellent flame retardance, water resistance and smoke suppression performance. The method is used for preparing the high-performance polyethylene material.

The present application relates to the technical field of toughening and flame-retardant modification of polylactic acid, and in particular to a modifier with toughening and flame-retardant effects, a preparation method thereof and application in high molecular weight polylactic acid. An olefin-based monomer is polymerized by addition to form an elastomer polymer with high molecular weight, which is then reacted with a soft monomer of acrylic ester in a uniform emulsion A to form a three-dimensional crosslinked network structure, and the molecular chain formed is an amorphous high-elasticity molecular segment, which has good toughness. The hard monomer of acrylic ester in the uniform emulsion B grafted inhibits diffusion and arrangement of the molecular segment, thereby achieving a toughening effect. Meanwhile, the hard monomer of acrylic ester reacts with lignin in situ in a bulk polymerization reaction. Since lignin has good carbonization in the combustion process, it can prevent the material from continuing to burn, and thus has good flame retardancy, can be used as a flame retardant for high molecular materials, expands the application field of lignin and improves the utilization rate of lignin.

The invention discloses a silicon-containing flame-retardant foot pad for an automobile and a preparation method of the silicon-containing flame-retardant foot pad, and relates to the technical field of foot pads. The needle-punched cloth is modified, and the flame-retardant property of the foot pad is enhanced by using the flame-retardant microcapsules. Iron oxide and silicon dioxide are compounded, the dispersity of silicon dioxide is enhanced, then the surface of silicon dioxide is wrapped with polypyrrole, the microcapsule is further prepared, the microcapsule can generate phosphorus-containing and nitrogen-containing groups during combustion, the char forming capacity is improved, and therefore the thermal stability and the carbon residue barrier property are enhanced; therefore, the escape of harmful gas is further inhibited, and the flame-retardant property of the silicon-containing flame-retardant foot pad is enhanced. The surface of the foot pad is also coated with a flame-retardant coating, so that the flame retardance of the foot pad is further enhanced.

The invention relates to the technical field of new materials, and discloses a composite flame-retardant coating and a preparation method thereof, and a flame-retardant hydrogel coating and a preparation method thereof. The method comprises the following steps: (1) in the presence of a reinforcing agent, a cross-linking agent, a photoinitiator and water, carrying out polymerization reaction on a sulfonate monomer containing double bonds and a phosphate monomer containing double bonds to obtain a precursor solution; and (2) performing contact mixing on the precursor solution and a filler to obtain the composite flame-retardant coating. The composite flame-retardant coating prepared by adopting the method for preparing the composite flame-retardant coating provided by the invention has relatively high fire resistance and high temperature resistance, is more excellent in char forming performance compared with common hydrogel coatings and the like, and has the characteristic of high designability.