285 results about "Limiting oxygen index" patented technology

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.

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 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 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 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 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 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 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 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 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.

The invention relates to a siloxane polycarbonate rare earth modified composite material and a preparation method thereof. Polymethylsiloxane microspheres are prepared through a one-step hydrolysis-polycondensation method, a CeO2 coated PMSQ core-shell structure is constructed in combination with a chemical precipitation technology, uniform dispersion of cerium oxide nanoparticles is achieved, and the problems of agglomeration and interfacial compatibility of traditional CeO2 nanoparticles are solved. The tensile strength of the prepared composite material reaches 33 MPa, the ultraviolet absorption rate reaches 80% after 8 h, the limit oxygen index is 28.5%, and the flame retardant property reaches the V-1 level. The method is suitable for the fields with high weather resistance requirements, such as new energy automobiles and photovoltaics.

The present invention relates to a flame-retardant lyocell fabric and a preparation method thereof, characterized in that the fabric can be prepared by the following method: using melamine and chloropropyl-POSS as main raw materials to react to prepare a substitution product of melamine and chloropropyl-POSS; then, reacting formaldehyde, the substitution product and lyocell fabric to prepare the flame-retardant lyocell fabric. The initial limiting oxygen index of the flame-retardant lyocell fabric prepared by the present invention reaches more than 30%, which belongs to the range of flame-retardant materials; after being washed with water five times, the limiting oxygen index does not decrease significantly and still reaches more than 28%; in addition, after being washed with water five times, the flame retardant performance of the flame-retardant lyocell fabric prepared by the present invention slightly exceeds the flame retardant performance of purchased flame-retardant lyocell fabric.

The invention discloses a polyamide cable material as well as a preparation method and application thereof. The cable material is prepared from the following raw materials in parts by weight: 100 parts of polyamide, 10 to 40 parts of nano magnesium hydroxide whisker, 1 to 5 parts of silane coupling agent, 1 to 5 parts of amphiphilic block copolymer, 1 to 10 parts of pentaerythritol triacrylate and 1 to 5 parts of antioxidant, wherein the fiber length of the nano magnesium hydroxide whisker is 200 to 1000 nm, and the fiber diameter of the nano magnesium hydroxide whisker is 30 to 80 nm. The polyamide cable material has good temperature resistance (can tolerate the high temperature of 135 DEG C for a long time), flame retardance (the limit oxygen index can reach 31% or above, preferably 33.5%), mechanical properties (excellent tensile strength and low-temperature impact resistance) and relatively high volume resistivity.

The invention provides a composite intumescent flame retardant modified polyamide composite material and a preparation method thereof. The flame-retardant nylon 66 and / or nylon 6 composite material is prepared from the following components in parts by weight: 75-85 parts of nylon 66 and / or nylon 6 matrix and 15-25 parts of composite intumescent flame retardant, wherein the composite intumescent flame retardant is prepared from the following components in parts by weight: 30-50 parts of a phytic acid derivative; 20 to 40 parts of melamine pyrophosphate (MPP); 5 to 15 parts of modified nanosheets; and 10-20 parts of a hydrogen bond cross-linking agent. According to the composite intumescent flame retardant modified polyamide composite material disclosed by the invention, the limit oxygen index and the fireproof grade can be remarkably improved under the condition that the addition amount of the composite intumescent flame retardant is low, and the mechanical property of the polyamide material is not influenced.

The invention discloses curtain cloth and a production process thereof, and aims to solve the problems that the conventional curtain cloth is inflammable and the conventional flame-retardant treatment method has defects. The curtain cloth comprises base cloth and a flame-retardant layer which coats and permeates the base cloth, and the flame-retardant layer contains raw materials such as a composite resin matrix and flame-retardant filler. The composite resin matrix is composed of a waterborne epoxy emulsion and UV-cured epoxy acrylate, and the flame-retardant filler contains phosphorus-nitrogen hybridized sodium alginate and nano-grafted lignin microspheres. The production process comprises the steps of base cloth activation, flame-retardant coating preparation, electrostatic-high-pressure double spraying, gradient curing and after-finishing strengthening. Through unique raw material compounding, the limit oxygen index of the curtain cloth is increased, combustion is delayed, and smoke is reduced; the washing resistance is improved by the amphiphilic film-forming agent; the production process ensures the performance of the base cloth, reduces energy consumption and VOC emission, and meets multiple requirements of modern buildings on safety, durability, comfort and green production of the curtain cloth.

The invention discloses an aluminum hydroxide flame-retardant modified pyridoxal phosphate cross-linked chitosan aerogel material and a preparation method thereof, and belongs to the technical field of biomass aerogel materials.The chitosan aerogel material is prepared from chitosan (CS), pyridoxal phosphate (P5P) and aluminum hydroxide (ATH). According to a feeding sequence of chitosan, aluminum hydroxide and pyridoxal phosphate, the chitosan aerogel material prepared by a method of heating and dissolving, standing and defoaming, in-situ curing and gelling, pre-freezing and vacuum freeze-drying is V-0 level according to a vertical combustion test, the limit oxygen index is greater than 80%, and the chitosan aerogel material has excellent mechanical property and flame retardant property and is suitable for industrial production. According to GB 8624-2012 Classification for Combustion Performance of Building Materials and Products, the modified chitosan aerogel can meet the requirements of A1 grade on a non-combustible furnace test.

The invention relates to the technical field of high polymer materials, in particular to a low-thermal-conductivity flame-retardant polyimide foam material and a preparation method thereof. The preparation method comprises the following specific steps: mixing aromatic dianhydride with a polar solvent, dissolving under a heating condition, adding low-molecular-weight alcohol, and continuously heating to perform esterification reaction on the components to obtain an esterified precursor solution; the preparation method comprises the following steps: adding a catalyst, a foaming agent, a surfactant, polymer polyol and a foaming agent, uniformly dispersing to obtain a foaming white material, quickly and uniformly mixing the foaming white material with isocyanate, fully foaming, and heating and curing to obtain the polyimide foam material. The polyimide foam material prepared through the method has the advantages of being low in heat conductivity coefficient, high in limit oxygen index, good in flame retardance, uniform in foam hole size, controllable in density and high in mechanical strength, and can be widely applied to the fields of aerospace, military ships and the like.

The invention relates to the technical field of high polymer materials and flame retardance, in particular to application of an efficient viscous compound material in oxygen barrier flame retardant materials, flame retardant polyolefin with hydroxyl is added into a high-shear twin-screw extruder, nano layered silicate and a reactive high polymer tackifier are sequentially added for reactive extrusion after melting, and the flame retardant polyolefin is obtained. And adding a micron-sized inorganic flame retardant and a carbon aid to the downstream of an extruder for blending, and finally cooling and pelletizing through an underwater pelletizing system to obtain the high-efficiency viscous compound material. According to the invention, a chemical bonding compatibilizing and toughening system is constructed through in-situ reaction of maleic anhydride grafted polypropylene and epoxy group functionalized SEBS, and complete stripping of nano-montmorillonite is realized by combining a step-by-step extrusion process, so that the problem that the mechanical property and flame retardance of a traditional high-filling flame-retardant material are difficult to consider at the same time is solved; the material has high limit oxygen index, high carbon residue rate and excellent tensile property, and the oxygen barrier layer is endowed with excellent mechanical toughness.

The invention discloses a high-stability battery diaphragm as well as a preparation method and application thereof, and relates to the technical field of lithium ion battery diaphragms. The high-stability battery diaphragm is prepared from the following raw materials in parts by mass: 70-95 parts of a base material polymer, 5-30 parts of an oxidation-resistant modified polymer, 30-70 parts of an inorganic filler, 1-10 parts of a plasticizer, 0.5-5 parts of a coupling agent, 0.1-3 parts of an antistatic agent and 3-5 parts of a stabilizer. The stabilizer is a specific-structure compound containing electron-rich nitrogen heterocyclic rings and active substituent groups, and the performance of the diaphragm is synergistically improved by quenching free radicals, complexing metal ions and inhibiting polymer chain slippage. Compared with the prior art, the porosity of the diaphragm and the electrolyte absorption capacity are remarkably improved, the limit oxygen index is greatly enhanced, and it is indicated that the diaphragm has better ion transmission efficiency and flame retardant safety. The diaphragm is suitable for the fields of power batteries, energy storage batteries and the like, and can effectively improve the high-temperature stability and service life of the batteries.

The invention discloses a preparation method of C3H5NO-ZnCl2, a preparation method of Mg4Al2Zn2PO4 hydrotalcite, a preparation method of an intumescent flame-retardant epoxy acrylate coating and a coating thereof, phosphate radical series hydrotalcite is prepared by adopting a coprecipitation method, the phosphate radical series hydrotalcite is matched with ZnCl2 and EA, and the coating is formed by UV curing, so that the flame-retardant property of the epoxy acrylate coating (EA) is improved, and the flame-retardant property of the coating is improved. The result shows that ZnCl2 can be well inserted into the hydrotalcite layer; the flame retardant effect of the Mg4Al2Zn2PO4-C3H5NO-ZnCl2 (1: 1) / EA coating is optimal, and the carbon residue rate, the limit oxygen index and the vertical combustion level of the coating are optimal and are respectively 56.84%, 56 and V-0. Meanwhile, the flame-retardant coating has good transparency and mechanical properties, the light transmittance of the flame-retardant coating can reach 92% at most, and the hardness of the flame-retardant coating reaches 6H; the thermal decomposition temperature is high, the high-temperature calcined carbon layer structure is a regular hexagonal honeycomb-shaped stable structure, and the flame retardant property is high.

This application belongs to the field of polymer materials technology, specifically disclosing a modified PC / ABS alloy and its preparation method. By weight, it comprises: polycarbonate: 50-80 parts; ABS resin: 15-40 parts; comb-shaped reactive compatibilizer: 3-8 parts; halogen-free flame retardant: 8-18 parts; nano-talc powder: 3-10 parts; core-shell toughening agent: 2-8 parts; antistatic agent: 0.5-3 parts; antioxidant: 0.2-0.8 parts; lubricant: 0.2-1.0 parts. The tensile strength (56.3-66.8 MPa), flexural strength (88.4-98.5 MPa), flexural modulus (2480-2780 MPa), and notched impact strength (23℃: 52.4-62.5 kJ / m) are also disclosed. 2 -30℃: 28.5~36.2kJ / m 2 Heat distortion temperature (110~125℃), limiting oxygen index (30.0~32.0%), flame retardant rating (V-0), and surface resistivity (5.2×10⁻⁶) are also specified. 9 ~2.5×10 10 In terms of Ω), it is better, and the high performance of PC / ABS alloy is achieved by using reactive compatibilizers, nano talc powder, phosphorus-nitrogen-silicon ternary synergistic flame retardant system, core-shell toughening agent and polymeric antistatic agent.

The invention relates to the technical field of biomass resource utilization, in particular to a lignin-based flame-retardant porous material and a preparation method thereof. The preparation method of the lignin-based flame-retardant porous material provided by the invention comprises the following steps: preparing straw lignin; mixing straw lignin, furfuryl alcohol and oxalic acid, and curing to obtain precursor slurry; performing steam foaming on the precursor slurry to form a porous framework; spraying the surface of the porous framework wet and then carrying out microwave carbonization treatment to form a carbonization layer on the surface of the porous framework. According to the preparation method provided by the invention, the material is endowed with excellent heat-insulating property (the heat conductivity coefficient is as low as 0.028 W / (m.K)) and intrinsic flame-retardant property (the limit oxygen index reaches 35% and reaches the UL94 V-0 standard) through a honeycomb hierarchical pore structure constructed by steam foaming and a compact carbonization layer formed by microwave surface carbonization.

The application discloses a kind of based on MXene / bimetallic phosphide / multi-polyphenol polymer multilevel flame-retardant photothermal material and preparation method, the material with nanosheet as base, by in-situ construction precursor and form bimetallic cobalt-nickel phosphide structure through phosphorization reaction, subsequently introduce tannic acid and dopamine on its surface, in-situ copolymerization is formed with the characteristics of multi-polyphenol photothermal layer of imitation mussel, to construct MXene / bimetallic phosphide / multi-polyphenol layer multilevel composite structure.The prepared photothermal material described in the application has excellent flame-retardant performance and photothermal conversion performance, can promote the formation of dense carbon layer during combustion, effectively inhibit heat release, smoke generation and toxic gas release;Under light condition, it can realize efficient photo-thermal conversion, and is used for preventing and removing ice in low-temperature environment.Adding the material as flame retardant to thermoplastic polyurethane can significantly improve the limiting oxygen index of the composite material and reduce the peak heat release rate.

The invention discloses an anti-aging flame-retardant tire rubber composition and a preparation method thereof, and belongs to the technical field of rubber tires. The rubber composition comprises the following components in parts by weight: 60-60 parts of natural rubber; 80 parts of butadiene rubber and 10 parts of butadiene rubber; 20 parts of organic silicon modified ethylene propylene rubber; 30 parts of a reinforcing filler; 50 parts of nano boron nitride; 8 parts of nano zinc oxide; 5 parts of stearic acid; 2 parts, 1.5 parts of sulfur; 2.5 parts of the raw materials and 1-2 parts of an accelerant; 3 parts of an anti-aging agent; 4 parts; the reinforcing filler is a mixture of modified white carbon black and modified montmorillonite according to the formula of (2 angstrom; and 4) a mass ratio of 1: 1. Through the synergistic effect of the organic silicon modified rubber and the modified montmorillonite, the rubber material has excellent mechanical properties, aging resistance and flame retardance, and the limit oxygen index reaches 33.5 angstroms; 35.8%, and vertical combustion V <->; the tensile strength retention rate after thermo-oxidative aging exceeds 91%, and the material can be widely applied to the high-requirement fields of lorries, engineering machinery, new energy automobiles and the like.

The invention discloses efficient flame-retardant smoke-suppressing polyurethane and a preparation method thereof.The efficient flame-retardant smoke-suppressing polyurethane comprises a material A and a material B. The material A is prepared from liquid polyether macromolecular dihydric alcohol, liquid polyether macromolecular trihydric alcohol, polyether carbonate polyol, a chain extender, a catalyst, a hydroxylation flame-retardant smoke-suppressing agent and a surface functional ceramic forming auxiliary; the material B is prepared from castor oil and diisocyanate; wherein the hydroxylated flame-retardant smoke suppressant is formed by carrying out ion exchange reaction on ammonium polyphosphate, an ammonium molybdate smoke suppressant and an alcohol amine modifier, and the surface functional ceramic forming additive is obtained by carrying out self-polymerization on a polyphenol compound on the surface of the inorganic ceramic forming additive to form a polymer coating. According to the efficient flame-retardant smoke-suppression polyurethane provided by the invention, organic solvents such as DMF are not used in the preparation process, organic solvent pollution is eliminated from the source, the limit oxygen index of the prepared polyurethane is greater than 28%, and the prepared polyurethane passes a V-0 grade through a UL-94 vertical combustion test, is low in maximum smoke density and has excellent comprehensive properties such as mechanical properties.