360 results about "Limiting oxygen index" patented technology

The invention belongs to the technical field of flame-retardant materials, and particularly relates to a phenylboronic acid-based P / N / B-containing halogen-free flame retardant, a preparation method thereof and application of the phenylboronic acid-based P / N / B-containing halogen-free flame retardant in epoxy resin. The preparation method comprises the following steps: by taking diphenyl hypophosphorous chloride as a basis, preparing a flame-retardant intermediate through nucleophilic substitution reaction between diphenyl hypophosphorous chloride and an aldehyde group-containing phenolic compound, then reacting a phenylboronic acid structure with 3-amino-1, 2-propylene glycol to obtain an amino group-containing phenylboronic acid compound, and finally reacting the phenylboronic acid compound with 3-amino-1, 2-propylene glycol to obtain the amino group-containing phenylboronic acid compound. And finally, carrying out a Schiff base reaction on the flame-retardant intermediate and an amino-containing phenylboronic acid compound to obtain the halogen-free flame retardant containing phosphorus, nitrogen and boron elements. The flame retardant provided by the invention can significantly improve the flame retardant property and mechanical property of epoxy resin. A flame-retardant epoxy resin prepared based on the flame retardant; the influence on Tg of an epoxy resin cured product is small, the smoke suppression and char formation performance and the mechanical performance of the cured product can be remarkably improved, and meanwhile, the flame retardant has excellent flame retardant efficiency; the limit oxygen index of the flame-retardant epoxy resin can reach 31%; the vertical combustion grade is V-0 or above, and the carbon residue amount can reach 18% or above.

The invention belongs to the technical field of flame-retardant materials, and particularly relates to preparation of a phosphorus, nitrogen and silicon macromolecular flame retardant and application of the phosphorus, nitrogen and silicon macromolecular flame retardant in epoxy resin. The preparation method comprises the following steps: firstly, carrying out substitution reaction on chlorosilane and syringaldehyde or vanillic aldehyde to synthesize a silicon-containing intermediate, then carrying out Schiff base reaction on the silicon-containing intermediate and an amine compound, and finally carrying out addition reaction on the silicon-containing intermediate and a phosphorus-containing compound to prepare the phosphorus, nitrogen and silicon macromolecular flame retardant. The flame retardant has a good flame-retardant effect, can be used for preparing flame-retardant epoxy resin, can effectively improve the limit oxygen index and the vertical combustion grade of the epoxy resin, and can endow the epoxy resin with good transparency and molten drop resistance.

The invention discloses a preparation method of a flame-retardant, light-emitting and recoverable transparent polyurethane material, which comprises the following steps: reacting triethanolamine with diphenylphosphonyl chloride to obtain a light-emitting flame retardant, and polymerizing the light-emitting flame retardant with polyether polyol, isocyanate and a chain extender to obtain the flame-retardant, light-emitting and recoverable transparent polyurethane material, the preparation method is simple, the process is easy to control, the prepared transparent polyurethane material can keep high tensile strength, the limit oxygen index can reach 30.3, the UL-94 grade reaches the V-0 grade, and the flame retardant effect is good; in addition, due to high transparency and fluorescence, the compound can be used as a light conversion film to be applied to a flexible solar cell, so that the photoelectric conversion efficiency of the flexible solar cell is improved.

The invention relates to the technical field of silicone rubber, and discloses flame-retardant and heat-insulating silicone rubber and a preparation method thereof.The flame-retardant and heat-insulating silicone rubber is obtained by reacting a flame-retardant aid with hollow glass beads and then adding the reaction product, methyl vinyl silicone rubber, hydroxyl silicone oil, a reinforcing agent, a flame retardant and a vulcanizing agent into an open mill to be mixed and vulcanized. The flame-retardant auxiliary agent contains a siloxane structural unit and is grafted on the surfaces of the hollow glass beads, so that the compatibility between the flame-retardant auxiliary agent and the methyl vinyl silicone rubber is improved, the hollow glass beads are more uniformly dispersed in a silicone rubber matrix, a uniform heat insulation network is formed, the heat conductivity is reduced, and the heat insulation performance is improved. The flame-retardant auxiliary agent contains nitrogen-rich triazine groups, and generates nitrogen and other non-combustible gases during combustion, so that the oxygen concentration of the combustion atmosphere can be diluted, and the limit oxygen index, flame retardance and high-temperature resistance of the silicone rubber are improved.

The invention belongs to the field of flame-retardant materials, and particularly relates to a flame-retardant wood-plastic composite material and a preparation method thereof. Raw camphorwood powder is subjected to alkali treatment and hyperbranched silicon dioxide grafting treatment and then is subjected to melt blending with polypropylene, piperazine pyrophosphate and melamine phosphate, and the wood-plastic composite material with the intumescent flame-retardant effect is prepared. Limit oxygen index, vertical combustion, thermogravimetry, cone calorimetry and other tests show that the prepared wood-plastic composite material has excellent flame retardance, the limit oxygen index can reach 36.8%, the vertical combustion test reaches the V-0 grade, the total smoke release amount is reduced to 45.3% of that of raw materials, the flame retardance, smoke suppression and other performance are remarkably improved, and the wood-plastic composite material has good application potential.

The invention belongs to the technical field of high polymer materials, and particularly discloses a halogen-free flame retardant DOPO-NH2 and a preparation method of halogen-free flame-retardant polyamide of the halogen-free flame retardant DOPO-NH2. The halogen-free flame retardant DOPO-NH2 is prepared by taking DOPO and 1, 4-butanediol as raw materials, and carrying out nitration and hydrogenation reduction reaction. The flame retardant DOPO-NH2 is mixed with binary acid and water to prepare a flame retardant organic salt solution, and then the flame retardant organic salt solution is subjected to polymerization reaction with a polyamide salt solution formed by a salt forming reaction of diamine and binary acid to prepare the halogen-free flame-retardant polyamide resin. The halogen-free flame-retardant polyamide prepared by the invention is excellent in flame retardant property, and can obtain a good flame retardant effect under different addition amounts; the limit oxygen index is basically more than 33%, the vertical combustion test reaches the UL94V-0 level, and the flame-free flame retardant is self-extinguished in the combustion test, and no molten drop is generated; the preparation method and process are simple, mild in condition and easy to operate.

According to the high-thermal-conductivity flame-retardant copper-clad laminate and the preparation method thereof, the thermal conductivity and the limit oxygen index of a copper-clad plate can be effectively improved, so that the high-thermal-conductivity flame-retardant property of the copper-clad plate is effectively improved; modified aluminum nitride and phosphoric acid modified aluminum nitride powder in the heat-conducting filler can keep good hydrolysis resistance in the ball milling process; polyvinyl butyral and polyethylene glycol are compounded as a binder, so that the modified aluminum nitride has good sphericity and surface smoothness, and the spherical aluminum nitride prepared by water-based spray granulation is suitable for being used as a heat-conducting filler of a thermal interface material; modified silicon dioxide in the heat-conducting filler adopts cerium-doped hollow mesoporous silicon dioxide nanospheres coated with polydopamine, and a corrosion inhibitor MBT (2-mercaptobenzothiazole) is loaded by the cerium-doped hollow mesoporous silicon dioxide nanospheres; controllable release of the corrosion inhibitor MBT and rare earth cerium ions is achieved, the process of corroding the cathode and the anode can be inhibited at the same time, and the corrosion resistance and the corrosion self-repairing performance of the copper-clad plate can be effectively improved.

The invention relates to the technical field of nylon, and discloses flame-retardant fireproof high-temperature-resistant nylon and a preparation method thereof. According to the invention, nylon 6, a montmorillonite-copper complex flame retardant and the like are extruded and granulated in a twin-screw extruder to obtain the flame-retardant fireproof high-temperature-resistant nylon. After surface organic modification, montmorillonite has good compatibility with nylon 6, the tensile strength of the material is increased, the flame retardant contains phosphate groups and more nitrogen-containing ureido and phenanthroline structures to form a nitrogen-phosphorus flame retardant, and meanwhile, the flame retardant contains a salicylic acid-phenanthroline-copper complex structure to catalyze charring of a nylon matrix at high temperature, so that the flame retardant has excellent flame retardancy. The flame retardance of the nylon material is remarkably improved, the UL94 grade reaches the V0 grade, the limit oxygen index is increased, the residual carbon amount at high temperature is increased, and the high-temperature resistance of the material is improved.

The invention discloses an environment-friendly flame-retardant polyvinyl alcohol film and a preparation method thereof, and relates to the technical field of polyvinyl alcohol films. The polyvinyl alcohol film is prepared from the following components in parts by weight: 90 to 110 parts of polyvinyl alcohol, 0.4 to 1.2 parts of polydopamine modified cellulose nanocrystals, 8 to 15 parts of chitosan / phytic acid / boron nitride composite flame retardant and 0.6 to 0.9 part of plasticizer. The preparation method comprises the following steps: adding polyvinyl alcohol into deionized water, dissolving and mixing to obtain a polyvinyl alcohol aqueous solution, adding glycerol, continuously stirring for 1-2 hours, sequentially adding a chitosan / phytic acid / boron nitride composite flame retardant and polydopamine modified cellulose nanocrystals, and uniformly stirring and mixing at 50-70 DEG C to obtain a blended solution; and carrying out film casting on the blended solution. The limit oxygen index of the film is greater than or equal to 30%, the vertical combustion grade is V-0, the tensile strength is greater than or equal to 40%, the elongation at break is greater than or equal to 140%, and the light transmittance is greater than or equal to 85%.

The invention belongs to the field of polyester fibers, and particularly relates to a flame-retardant polyester fabric which comprises the following raw materials: 50-70 parts of PET polyester chips, 20-30 parts of modified PET polyester master batches, 1-3 parts of a coupling agent, 1-5 parts of nano silicon dioxide, 0.5-1 part of an antioxidant and 5-10 parts of PEG-400. The polyester fabric prepared by the invention has excellent flame retardant property, the initial limit oxygen index of the polyester fabric reaches 36.8%, and the vertical combustibility UL-94 reaches V0 level; in addition, after 50 times of washing, the limit oxygen index of the fabric is not obviously reduced, and the fabric has good washable performance.

The invention relates to a hot-melt halogen-free flame-retardant epoxy resin composition and a preparation method thereof, a prepreg and a fiber reinforced composite material. The composition is composed of an epoxy resin matrix, a halogen-free flame retardant, a curing agent and an auxiliary agent, the organic phosphorus halogen-free flame retardant with a specific molecular structure is adopted to react with the epoxy resin matrix, the flame retardant property and the thermal stability of a system are improved, the mechanical property is considered, and the adding amount of the halogen-free flame retardant is 10-25% of the mass of epoxy resin. The preparation method comprises the following steps: stirring and mixing the epoxy resin and the flame retardant at 50-80 DEG C, adding the curing agent and the auxiliary agent, uniformly dispersing, and cooling to obtain the composition. According to the prepreg, basalt fiber is used as a reinforcing material, a fiber reinforced composite material can be prepared through a hot press molding process, the oxygen index (LOI) of the prepreg is higher than 30%, the vertical combustibility reaches the UL94 V-0 level, and the prepreg is suitable for the fields of new energy automobiles, electronic appliances and the like. Through halogen-free design, the halogen-free flame-retardant halogen-free flame-retardant halogen-free halogen-free flame-retardant halogen-free halogen-free flame-retardant halogen-free halogen

The invention discloses a halogen-free compound flame retardant and application thereof in an antistatic nylon 66 composite material, and belongs to the technical field of polymer composite materials. The halogen-free compound flame retardant is prepared by compounding 68 parts of an organic aluminum hypophosphite flame retardant, 20 parts of a nitrogen-phosphorus intumescent flame retardant, 10 parts of a two-dimensional layered inorganic substance and 2 parts of a coupling agent through a high-speed mixing and drying process. The halogen-free compound flame retardant is blended with nylon 66, reinforced fibers, an antioxidant and the like, and the composite material is prepared through melt extrusion. According to the compound system, the total dosage of the flame retardant is remarkably reduced, the V-0 flame retardant grade is still achieved under the condition that the thickness is 0.8 mm, and the limit oxygen index exceeds 32%. The composite material has excellent flame retardancy and antistatic property while maintaining good mechanical properties, is suitable for a high glass fiber content system, effectively solves the problems of high flame retardant addition amount, difficult processing, high cost and the like in the prior art, and has the advantages of simple process and excellent comprehensive performance.

The invention relates to the technical field of flame-retardant materials, and provides a polysiloxane-based flame retardant, a preparation method thereof and a polycarbonate composite flame-retardant material.The polysiloxane-based flame retardant comprises a structure shown in the formula (I), a structure shown in the formula (II) and a structure shown in the formula (III); the invention further provides a preparation method and application of the polysiloxane-based flame retardant. The polysiloxane-based flame retardant provided by the invention has the advantages of high flame-retardant efficiency, low addition amount and small influence on transparency and mechanical properties, and experimental results show that the polycarbonate composite material added with 1wt% of the polysiloxane-based flame retardant can reach UL94 V-0-level flame retardance of a sample with the thickness of 1.6 mm, the limit oxygen index LOI is improved to 36.4% from 26.6% of pure PC, and the flame retardance of the polycarbonate composite material is greatly improved. The transparency and the mechanical property are basically unchanged.

The present invention relates to a bimetallic layered hydroxide / phytic acid synergistic flame-retardant nylon 6 composite material and its preparation method and application, belonging to the technical field of flame retardant material synthesis. The composite material is prepared from nylon 6, bimetallic layered hydroxide and phytic acid. Wherein, the phosphate functional group in the phytic acid can chelate with the metal ion in the bimetallic layered hydroxide, thereby forming a novel flame retardant. When combustion occurs, the layered structure and thermal decomposition products such as metal oxides, metal phosphates, and carbon-containing aromatic network structure substances in the flame retardant help to suppress the release of smoke and toxic gases, and the release of metal ions and phosphorus-containing free radicals helps to suppress the spread of fire. Compared with pure nylon 6, the peak heat release rate and total heat release rate of the composite material are greatly reduced, the limiting oxygen index is greatly increased, and the vertical combustion test reaches V-0 level. At the same time, the raw material sources in the preparation method of the composite material are abundant, the operation is simple, and it is suitable for scaled-up production.

The invention discloses a flame-retardant composite wood board and a preparation method thereof.The preparation method of the composite wood board comprises the following steps that single-layer wood boards are soaked in an aqueous solution containing a first flame retardant and dicyandiamide, after drying, the multiple single-layer wood boards are bonded and pressed through an adhesive, and the flame-retardant composite wood board is prepared; the preparation method of the first flame retardant comprises the following steps: S1: 1, reacting 2-bis (chlorodimethylsilyl) ethane with syringaldehyde in a first organic solvent to prepare an intermediate A; s2, reacting the intermediate A with tyrosine in a second organic solvent to prepare an intermediate B; s3, the intermediate B and phosphorous acid are mixed for a reaction, and the first flame retardant is prepared. The first flame retardant can form covalent bond combination with the wood board, so that the flame retardant property of the treated wood is remarkably improved; and meanwhile, the second flame retardant in the adhesive and the first flame retardant impregnated on the wood board can achieve a synergistic promotion effect, so that the limit oxygen index of the prepared composite wood board is up to 60% or above.

The invention discloses a hyperbranched flame retardant as well as a preparation method and application thereof. The flame retardant is prepared by the following steps: dehydrating and pre-polymerizing a boron-containing component (such as tetrahydroxy diborane) and dihydric alcohol (such as 1, 3-propylene glycol), and condensing with trihydroxymethyl phosphine oxide. 4 parts of the flame retardant is added into epoxy resin, phosphorus-containing free radicals can be released in a gas phase for quenching and smoke suppression, a compact boron-containing expanded carbon layer is formed in a condensed phase, and synergistic flame retardance is achieved. The hyperbranched structure can be embedded into an epoxy network, synchronous reinforcement and toughening are achieved, the impact strength is improved by 123.5%, and the tensile strength is improved by 47.7%. The flame retardant has efficient flame retardance (the limit oxygen index is 33.9%, UL-94V-0 level), high transparency and excellent mechanical properties, and is suitable for epoxy resin composite materials in the fields of electronic packaging, aerospace and the like.

The invention relates to the technical field of rubber conveying belts, and discloses a high-temperature-resistant flame-retardant chlorinated polyvinyl chloride plastic conveying belt. The conveyor belt aims at solving the problems that an existing rubber-based conveyor belt is poor in thermal stability, low in flame retardant efficiency and rapid in mechanical property attenuation in a high-temperature, open fire or thermal radiation environment. The tensile body is composed of an upper covering layer, a lower covering layer and a tensile body core layer. The covering layer is formed by blending and extruding chlorinated polyvinyl chloride resin, a heat stabilizer, a flame retardant synergist, a smoke suppressant, a plasticizer, a lubricant and an inorganic filler; and the core layer is formed by compounding and hot-pressing plasma-treated aramid fabric and chlorinated polyvinyl chloride dipping slurry. Through multi-component collaborative design, the conveyor belt keeps structural integrity and mechanical properties under long-term thermal exposure at 200 DEG C, the limit oxygen index is larger than or equal to 38% and reaches the UL94 V-0 level, and the conveyor belt is free of molten drops, low in smoke and low in toxicity, can be subjected to continuous thermoplastic forming and does not need vulcanization.

The invention relates to the technical field of cable materials, and particularly provides a composite flame-retardant cable material and a preparation method thereof, and the composite flame-retardant cable material comprises the following components: matrix resin: 50-70 parts of ethylene-vinyl acetate copolymer; a composite flame retardant system: 15 to 25 parts of ammonium polyphosphate / pentaerythritol and 5 to 10 parts of Mg / Al-LDH; and the synergistic smoke suppressant is 1-3 parts of a compound compounded by zinc borate and silicon dioxide according to the mass ratio of 1: 1. Through the synergistic effect of an ammonium polyphosphate / pentaerythritol intumescent flame retardant system and Mg / Al-LDH, a gas phase-condensed phase dual flame retardant mechanism is formed, and when the total addition amount of the flame retardant is smaller than or equal to 35%, the composite system can reach the UL-94 V-0 level, the limit oxygen index (LOI) is larger than or equal to 32%, and the composite system is remarkably superior to a traditional single flame retardant system.

The invention belongs to the field of flame-retardant composite materials, and particularly relates to a multifunctional flame retardant and application thereof in epoxy resin. The method comprises the following steps: firstly, carrying out nucleophilic substitution reaction on tert-butyldimethylsilyl chloride and syringaldehyde to obtain a primary intermediate product; carrying out condensation reaction on the primary intermediate product and an amino-containing compound to form a secondary intermediate product with a Schiff base structure; and finally, carrying out addition reaction on the secondary intermediate product and a specific phosphorus-containing reagent to successfully prepare the target flame retardant. Researches show that the flame retardant is remarkable in efficiency, can effectively improve the limit oxygen index (LOI value) and the vertical combustion test (such as UL-94) grade of a material after being applied to an epoxy resin system, and endows the composite material with excellent light transmission, anti-dripping performance and good ultraviolet shielding characteristic.

The invention discloses a bio-based flame-retardant coating based on ammonium polyphosphate, which is prepared by taking a chitosan / lignin / ammonium polyphosphate bio-based flame retardant CS / LS / APP (short for CLA) as a flame retardant, urea, formaldehyde and melamine as resin raw materials, dioctyl phthalate DOP as a plasticizer and tannic acid as a curing agent. The preparation method comprises the following steps: 1, preparing the chitosan / lignin / ammonium polyphosphate bio-based flame retardant CLA; 2, preparation of a melamine-urea formaldehyde resin emulsion MUF (Melamine-Urea Formaldehyde); and 3, preparing the bio-based flame-retardant coating MUF / CLA based on ammonium polyphosphate. When being used as a wood flame-retardant coating, the flame-retardant coating has a flame-retardant property and passes a UL-94V-0 grade test; a carbon residue layer formed after complete combustion is continuous and compact; the limit oxygen index is 32.6 + / -0.06%; the maximum heat release rate is 42.83 + / -1.51 kW / m < 2 >, the total heat release amount is 2.62 + / -1.25 MJ / m < 2 >, and the fire increase index is 0.37 + / -0.02 kW / m < 2 >. S.

The invention provides a ternary synergistic flame retardant suitable for a polylactic acid composite material and a preparation method thereof. The ternary synergistic flame retardant comprises ternary components of magnesium hydroxide, zinc oxide and titanium dioxide, the ternary component is subjected to surface modification through a silane coupling agent solution containing an epoxy group, the mass ratio of magnesium hydroxide to zinc oxide to titanium dioxide is 4: 1.5: 1-5: 2: 1, and the ternary component is used for maintaining the mechanical property of polylactic acid and achieving the synergistic effect of flame retardance and smoke suppression at the same time. According to the polylactic acid composite material prepared by the invention, the limit oxygen index is increased to 28.85% from 19.91%, the increase amplitude is about 45%, and the UL-94 V-0 grade is reached; the maximum smoke density is reduced from 287 to 198, the reduction amplitude is about 31%, and the flame retardant efficiency of the material and the visibility in the combustion process are remarkably improved. The addition amount of the ternary synergistic flame retardant is controlled in a range of 15-25%, an excellent flame retardant effect can be obtained, the addition amount is greatly reduced compared with that of a single magnesium hydroxide system (generally, the addition amount needs to be larger than or equal to 40%), and the mechanical property loss caused by high filling is effectively avoided.

The application relates to the technical field of adhesives, and discloses a low-VOC flame-retardant double-faced adhesive for automobile interiors and a preparation method thereof. In the application, tetramethyl ethylene (epoxy propyl ammonium chloride) and bis (4-aminophenyl) -phenyl phosphate are reacted to obtain a cationic flame retardant, which is then added into a water-based acrylic resin emulsion to obtain a flame-retardant water-based acrylic resin adhesive and a flame-retardant double-faced adhesive. The cationic groups in the cationic flame retardant and the sodium carboxylate anions in the water-based acrylic resin form electrostatic force, the crosslinking degree between acrylic resin molecular chains is improved, the cohesion is increased, and the bonding performance and tensile shear strength of the adhesive are improved. The cationic flame retardant contains a triphenyl phosphate flame-retardant structure, has condensed-phase flame-retardant effect, improves the limiting oxygen index and the flame-retardant performance of the adhesive, and has good practical application in adhesives for new energy vehicles, double-faced adhesives and the like.

The invention discloses a novel microcapsule flame retardant and a preparation method thereof, and relates to the technical field of flame retardants. According to the novel microcapsule flame retardant, a novel biological matrix material is prepared from carboxymethyl chitosan. Then taking NF-grade cholesterol and a novel biological matrix material NF-carboxymethyl chitosan derivative as a shell material, and taking phosphoric acid metal salt as a capsule core; the novel biological matrix material carboxymethyl chitosan derivative shell material is low in cost, green and non-toxic, and is emulsified and cross-linked with NF-grade cholesterol, so that the flame retardant can be better coated, the surface of the flame retardant can be modified, and the microcapsule flame retardant has excellent and lasting flame retardant property. The flame retardant can be used for flame retardant modification of unsaturated polyester resin, the vertical combustion grade of the obtained flame retardant unsaturated polyester resin reaches V1, the limit oxygen index is 33%, and the flame retardant unsaturated polyester resin has good flame retardance, is suitable for high flame retardant requirements, has the smoke density grade of 58, and is low in smoke density and environmentally friendly.

The invention relates to the field of special polymer materials, in particular to polyimide foam with low thermal conductivity and high flame retardance and a preparation method thereof. According to the invention, hollow glass microspheres (HGM) are used as a carrier, and a novel three-stage coating structure of an inner layer (heat absorption dehydration), a middle layer (catalytic carbon formation) and an outer layer (smoke suppression hydrophobic) is constructed outside the hollow glass microspheres (HGM). The preparation method comprises the following steps: dispersing three-layer coated HGM (15-35%) in a foaming black material, mixing with a foaming white material to react to generate a foam intermediate, and carrying out gradient heating curing molding to obtain the foam with the density of 18-30kg / m < 3 >, the heat conductivity coefficient of less than or equal to 0.035 W / (m.K), the limit oxygen index of more than or equal to 41.5% and the smoke density Ds of less than 100. The problem that a traditional filler cannot consider low density, low heat conductivity, high flame retardance and processing compatibility at the same time is solved, and the filler is suitable for fire prevention and heat insulation of a spacecraft thermal protection layer and a new energy battery pack.

The invention discloses a boron-modified polybenzoxazine aerogel flame-retardant heat-insulating material and a preparation method thereof, and aims to solve the problems that the existing polybenzoxazine aerogel flame-retardant heat-insulating material is low in flame retardance, high in heat conductivity, unsafe and not environment-friendly in preparation process and the like. The preparation method of the flame-retardant heat-insulating material comprises the following steps: dissolving an alcohol-soluble benzoxazine monomer in an alcohol solvent, adding a boron compound into the alcohol solvent to modify benzoxazine, pouring the reaction solvent into a hydrothermal reaction kettle by adopting a solvothermal method, heating together, performing ring opening polymerization on the benzoxazine monomer at the temperature of 100-160 DEG C to prepare boron modified polybenzoxazine initial state gel, and preparing the boron modified polybenzoxazine initial state gel into the flame-retardant heat-insulating material. And then performing aging, solvent replacement and normal-temperature and normal-pressure drying operation. The production process is simple, the preparation process is environment-friendly and low in cost, solvents participating in the reaction are low in toxicity, and safety and environment friendliness can be achieved; the prepared thermal insulation material has the advantages of small density, low thermal conductivity, limit oxygen index greater than 29, and good thermal insulation effect.

The invention belongs to the technical field of flame retardants, and particularly relates to a melamine hydrobromide flame retardant and a preparation method thereof. The flame retardant disclosed by the invention has a core-shell structure, the core is hydroxylated melamine hydrobromide subjected to surface modification by a silane coupling agent, and the shell is melamine resin synergistically enhanced by ammonium polyphosphate and oxidized cellulose nanofibrils; through silanization treatment, core-shell interface combination is enhanced, and space-time synergy of gas phase and condensed phase flame retardance is achieved through a composite shell; the obtained flame retardant is high in thermal stability in a polymer matrix, the limit oxygen index of a composite material can be remarkably increased after the flame retardant is added, and the flame retardant has a wide application prospect in the field of flame retardance of high polymer materials through a UL-94 V-0 grade test.

The invention belongs to the technical field of inorganic flame retardants, and discloses a nano magnesium hydroxide / black phosphorene compound flame retardant as well as a preparation method and application thereof. The invention relates to a nano magnesium hydroxide / black phosphorene compound flame retardant, which comprises nano magnesium hydroxide and black phosphorene, the mass ratio of the nano magnesium hydroxide to the black phosphorene is (1-10): 1, and the compound flame retardant is added into an amino polydimethylsiloxane and epoxy resin composite material matrix. According to the invention, a compound flame retardant compounded by nano-scale hexagonal sheet magnesium hydroxide (MH) and black phosphorene (BP) is prepared by adopting an electrostatic self-assembly principle, when the addition amount is 1 wt% of BP and 4 wt% of MH, the composite material can reach the vertical combustion V-0 level, the limit oxygen index can reach 25.3-25.7%, the heat conductivity coefficient is greater than 1.6 W.m <-1 >. K <-1 >, and the flame retardant has good flame retardance. The problem that the mechanical property of the material is greatly reduced due to high addition amount of magnesium hydroxide is solved, and a new thought is provided for modifying black phosphorene.

The invention provides efficient heat-insulation flame-retardant wall cloth and a preparation method thereof.The preparation method comprises the following steps that S1, a substrate is placed in an ethanol solution containing gamma-aminopropyltriethoxysilane to be subjected to ultrasonic treatment and dried, and a pretreated substrate is obtained; s2, waterborne polyurethane, melamine modified phenolic resin, expansible graphite, silicon dioxide aerogel powder and microencapsulated ammonium polyphosphate are mixed according to the mass percent, formed slurry is sprayed to the surface of the pretreated substrate, curing is conducted, and a flame-retardant coating is formed; s3, spinning a spinning solution containing polyimide, silicon dioxide aerogel powder and an organic solvent to obtain a nanofiber membrane; s4, a nanofiber membrane is compounded to the surface of the flame-retardant coating in a hot-pressing mode, and a nanometer heat insulation layer is formed; s5, finally, the substrate is placed in the self-repairing liquid to be repeatedly soaked and dried, and the efficient heat-insulation flame-retardant wall cloth is obtained. The limit oxygen index of the prepared wall cloth is larger than or equal to 35%, UL94 is V-0 level, the heat conductivity coefficient is smaller than or equal to 0.03 W / m.K, and the excellent heat insulation and flame retardant effects are achieved.

The invention belongs to the field of polyester fibers, and particularly relates to a flame-retardant polyester fabric, a preparation method of which comprises the following steps: uniformly mixing 100 parts of modified polyester master batch, 5-15 parts of mica powder, 1-5 parts of antioxidant, 1-3 parts of ultraviolet screening agent and 8-10 parts of polyethylene glycol 20000, and then carrying out melt spinning on a spinning machine to obtain polyester fibers, and finally, spinning the polyester fibers into the flame-retardant polyester fabric through a textile machine. The prepared polyester fabric has excellent flame retardant property, the initial limit oxygen index of the polyester fabric reaches 39.5%, the vertical combustibility UL-94 of the polyester fabric reaches the V0 level, and after the polyester fabric is washed 100 times, the polyester fabric still has the high limit oxygen index and has good washing fastness.

The limit oxygen index of the covering yarn is larger than or equal to 38%, the covering yarn is free of molten drops during vertical combustion, the thermal shrinkage rate at the high temperature of 300 DEG C is smaller than or equal to 5%, the flame-retardant retention rate after 20 times of washing is larger than or equal to 90%, and the covering yarn is suitable for the fields of fire protection, high-temperature industry and the like and has high flame retardance, dimensional stability and durability.