470 results about "Limiting oxygen index" patented technology

The invention discloses a preparation method of a non-additive nitrogen-phosphorus-cerium synergistic flame-retardant polyurethane elastomer, and the polyurethane elastomer is prepared by taking isocyanate as a hard segment and poly (1, 4-butanediol adipate) as a soft segment, and compounding the hard segment and the soft segment with 2-amino-4-hydroxy-6-methylpyrimidine, a phosphorus reactive flame retardant and cerium oxide. The preparation method is simple, the process is easy to control, and the prepared polyurethane elastomer has good tensile strength; besides, the limit oxygen index of the polyurethane elastomer reaches 27.4, the polyurethane elastomer meets commercial standards of flame-retardant materials and UL-94 V-0 flame-retardant grade requirements, the ultraviolet band light transmittance is 0%, ultraviolet rays can be completely isolated, and the polyurethane elastomer has a good anti-oxidation function and can be applied to the industries of wires, cables, pipe profiles, films, general molding and the like.

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 present invention relates to a graphene-modified multifunctional polyester fiber and a preparation method and an application in down filling, belonging to the technical field of down filling. The preparation method of the present invention comprises the following steps: S1, under the action of an acid binding agent, trimethylolethane and phosphorus oxychloride are reacted in a solvent in the first stage, and then graphene oxide is added for the second stage reaction to obtain modified graphene oxide; S2, the modified graphene oxide and polyester powder are granulated to obtain a multifunctional polyester masterbatch; S3, the multifunctional polyester masterbatch and polyester slices are spun to obtain a graphene-modified multifunctional polyester fiber. The far-infrared normal emissivity of the graphene-modified multifunctional polyester fiber is 0.89-0.92, the far-infrared radiation temperature rise is 2.3℃-3.1℃, the limiting oxygen index reaches 28.3%-29.0%, the antibacterial performance is higher than 99.9%, and the breaking strength is 3.2cN / detx-3.4cN / detx.

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 relates to a shape memory polyimide composite material with a spider-silk-like microstructure and a preparation method and application thereof. According to the method, the composite material is designed by coupling the spider-silk-like microstructure, shape memory polyimide, a flame retardant and an electromagnetic shielding two-dimensional intercalation compound. Conductive polyaniline and transition metal carbon / nitride are subjected to an intercalation reaction to prepare a Ti3C2Tx-coated PANI intercalation compound, then the Ti3C2Tx-coated PANI intercalation compound is compounded with SMPI to serve as a spider-silk-like microstructure to enhance the mechanical strength and electromagnetic shielding performance of a resin matrix, and when the thickness of the SMPI composite material is 100 micrometers, the electromagnetic shielding effectiveness of the SMPI composite material in the X wave band exceeds 25 dB, and 99% or above of incident microwaves are effectively shielded. In addition, the flame retardant grade of the composite material reaches V0 grade, the limit oxygen index is 39.1%, the composite material also has high temperature resistance and shape memory characteristics, the shape fixation rate is 96%, and the shape recovery rate is 97%. The composite material not only can eliminate electromagnetic interference, but also can resist flame, can be automatically deformed, and is applied to the fields of self-adaptive deformation thermal management electromagnetic shielding devices, intelligent wearable equipment and the like.

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 polycarbonate, and discloses a preparation method of a halogen-free flame-retardant PC plastic material. According to the invention, polycarbonate and a triazine sulfonate-based silicone oil flame retardant are blended in a torque rheometer to obtain the halogen-free flame-retardant PC plastic material. A sulfonate group in the flame retardant can catalyze polycarbonate to be crosslinked into carbon, polysiloxane is pyrolyzed, an S-C layer is formed on the surface of polycarbonate, and a triazine group is pyrolyzed to generate nitrogen and other non-combustible gases, so that the limit oxygen index, the UL94 grade and the flame retardant property of the polycarbonate plastic material are improved. The triazine sulfonate-based silicone oil flame retardant contains hydroxyl, imino and other groups and has good compatibility with polycarbonate, the main chain is a flexible polysiloxane main chain, a good toughening effect can be achieved, and the bending strength and impact strength of a polycarbonate material are 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 the technical field of flame-retardant materials, and discloses a preparation method and application of an ultralow-additive-amount MOF-derived LDH composite flame retardant, firstly, MOF groups are loaded on a phosphorus-nitrogen flame retardant, and then etching modification is performed by using an acidic salt solution to form a double hydroxide structure with a hollow and surface layered structure, so that LDH (at) MOF (at) APP is obtained. The synthesized MOF flame retardant contains LDH components, so that the influence on the physical and mechanical properties of a high polymer material can be reduced, and meanwhile, the addition amount of the flame retardant is reduced. The MOF-derived LDH material and the flame-retardant element nitrogen are introduced into the flame retardant, so that the plastic additive with the flame-retardant function has excellent compatibility with a polylactic acid matrix. UL-94 vertical combustion V-0 grade can be passed only by an extremely low addition amount, and the limit oxygen index is greater than 26%. The preparation process is mature, convenient to operate, mild in condition and easy to popularize and apply on a large scale.

Ammonium dihydrogen phosphate (ADP), phytic acid (PA) and guanazole (GZ) are taken as main raw materials, gamma-aminopropyltriethoxysilane KH550 is taken as a coupling aid, and the KH550 has the effects of improving the interaction force between ADP, PA and GZ and the surface of wood and providing a silicon element to form Si-O with a high-stability structure. The preparation method comprises the following steps: 1, preparing a phytic acid-guanidazole polyelectrolyte solution PG; and 2, preparation of the smoke suppression and flame retardation liquid ADP / KH550 / PG. When being used as a wood flame-retardant liquid, the flame-retardant liquid has flame-retardant property, and passes a UL-94V-0 grade test in a UL-94 grade test; a carbon residue layer formed after combustion is in a large-area continuous compact state; the limit oxygen index is 38.4 + / -1%; the maximum heat release rate is 41.31 + / -2.51 kW / m < 2 >, the total heat release amount is 6.15 + / -0.94 MJ / m < 2 >, the total smoke release amount is 0.26 + / -0.01 m < 2 >, and the fire increase index is 0.31 + / -0.02 kW / m < 2 > / s. And the carbon residue amount at 800 DEG C is 40.96 + / -1 wt.%.

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 cationic antibacterial flame-retardant fiber and a preparation method thereof, the cationic antibacterial flame-retardant fiber is formed by composite spinning of a bi-component modified material, the cross section of the fiber is of a skin-core structure, and both a skin layer material and a core layer material adopt an in-situ copolymerization method. The skin layer material is the prepared high-temperature-resistant polymerizable cationic antibacterial agent, and copolymerization modified polyester with good spinnability and high antibacterial activity is obtained after copolymerization reaction. And the core layer is common phosphorus flame-retardant polyester. The cationic antibacterial flame-retardant fiber is prepared through bi-component composite spinning. The fiber strength of the cationic antibacterial flame-retardant polyester fiber prepared by the method is greater than or equal to 2.8 cN / dtex, the limit oxygen index LOI is greater than or equal to 29%, and the antibacterial rate meets the AAA level standard. The preparation method is simple, convenient in raw material source and easy for industrial production.

The invention discloses organosilicone cyclophosphazene modified epoxy resin and a preparation method thereof, belongs to the field of flame-retardant materials, and particularly relates to a preparation method of an organosilicone cyclophosphazene flame retardant and a preparation method of the organosilicone cyclophosphazene modified epoxy resin. The invention aims to research and develop a synergistic composite flame retardant of three elements of N, P and Si by optimizing the structure of the flame retardant and solve the problem of low flame retardant efficiency of the flame retardant. The preparation method comprises the following steps: taking hexachlorotripolyphosphazene, p-hydroxybenzaldehyde, p-aminobenzoic acid, DOPO and triphenylsilanol as raw materials, and carrying out substitution, dehydration condensation, addition and esterification to obtain the organic silicon cyclophosphazene flame retardant. The modified epoxy resin is obtained by taking m-phenylenediamine as a curing agent and adding organosilicone cyclophosphazene flame retardants in different proportions. The organosilicone cyclophosphazene modified epoxy resin provided by the invention reaches the standard of a flame-retardant material, and the limit oxygen index is up to 31.6%, which passes a UL-94 test.

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 high polymer materials, and particularly discloses a nano-silica synergistic flame-retardant polypropylene composite material and a preparation method thereof, and the nano-silica synergistic flame-retardant polypropylene composite material comprises the following components in parts by mass: 50-70 parts of PP resin, 10-20 parts of a flame retardant, 2-8 parts of a flame-retardant synergist, 1-5 parts of a flow modifier, 0.2-0.8 part of an anti-dripping agent and 0.5-2 parts of an antioxidant. Compared with the prior art, the flame-retardant polypropylene composite material has the beneficial effects that the prepared flame-retardant polypropylene composite material has excellent performance in tensile strength, elongation at break, bending strength, impact strength, melt index and limit oxygen index.

The invention relates to a colored flame-retardant polyester fiber with efficient flame-retardant characteristic and a preparation method thereof.The preparation method comprises the steps that firstly, a PDI derivative with the end group being-NH2 is added into ethyl alcohol dispersion liquid of alpha-ZrP, alpha-ZrP-PDI colored efficient flame-retardant molecules obtained through a reaction are blended with a polyester chip powder matrix, and colored efficient flame-retardant master batches are obtained; and finally, blending the colored high-efficiency flame-retardant master batch and polyester chips, and carrying out melt spinning to obtain the colored flame-retardant polyester fiber. The limit oxygen index of the colored flame-retardant polyester fiber is greater than or equal to 32%, the vertical combustion grade is V0, the breaking strength is greater than or equal to 4.7 cN / dtex, and the washing color fastness at 60 DEG C is above grade 4. The alpha-ZrP and the PDI amino derivative react to form an ordered layered stacking structure, so that the flame-retardant effect is remarkably improved; the prepared colored flame-retardant polyester fiber not only has excellent flame retardance, but also has uniform color distribution and good mechanical strength.

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 belongs to the technical field of flame-retardant fabrics, and relates to a method for preparing a durable flame-retardant nylon 6 fabric based on a reactive phosphorus-sulfur flame retardant, specifically: after adding nylon 6 fabric to a finishing solution containing a reactive phosphorus-sulfur flame retardant, a free radical initiator and a solvent a, reacting at 75-85°C for 6-8h to obtain a durable flame-retardant nylon 6 fabric; the limiting oxygen index of the durable flame-retardant nylon 6 fabric is higher than 29.3%, the damaged length is lower than 10.5cm, no molten droplets are generated, and after 40 washes, it can still pass the vertical burning test, the damaged length is lower than 14.4cm, and no molten droplets are generated. The flame-retardant nylon 6 fabric prepared by the method of the present invention has good flame retardant effect and excellent water-washing resistance.

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.