188 results about "Limiting oxygen index" patented technology

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 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 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 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 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 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.

The invention relates to the technical field of polyvinyl chloride, and discloses a flame-retardant plasticized PVC decorative film and a preparation process, the PVC decorative film comprises 100 parts by weight of polyvinyl chloride, 10-30 parts by weight of a composite plasticizer, 10-25 parts by weight of an inorganic flame retardant and the like; polyvinyl chloride, the composite plasticizer and the like are mixed, melt extrusion and blow molding are performed, and the flame-retardant plasticized PVC decorative film is obtained. The organic silicon phosphate contains a plurality of alkyl ester structures, so that the flexibility and the elongation at break of the polyvinyl chloride are improved. The flame-retardant polyvinyl chloride material contains flame-retardant phosphorus and silicon elements, has a good condensed-phase char-forming flame-retardant effect, has a good synergistic flame-retardant effect with aluminum hydroxide and other inorganic flame retardants, improves the limit oxygen index of polyvinyl chloride, can maintain good flame-retardant performance, and can be prepared into a building decorative film with high strength, good flexibility and excellent flame retardance.

Subject of the invention is a porous support layer for a roofing underlayment, comprising a first nonwoven layer comprising polyester fibers, and a second nonwoven layer comprising organic flame-resistant fibers, wherein the combustion temperature of the flame-resistant fibers is at least 500° C. and / or the limiting oxygen index (LOI) of the flame-resistant fibers is at least 25%, wherein the second nonwoven layer is a surface layer of the support layer, wherein the support layer is mechanically consolidated. Subject of the invention are also construction materials, such as roofing underlayment from the support layer and a bitumen layer; and roofs and buildings comprising the roofing underlayment, and respective methods and uses.

The invention relates to heterocyclic onium ion type intrinsic flame-retardant thermoplastic polyurethane and a preparation method thereof, and the main method comprises the following steps: by taking heterocyclic onium ion type diol, micromolecular diol and isocyanate group-terminated polyurethane oligomer as raw materials, polymerizing for a certain time in an organic solvent in a nitrogen atmosphere at a certain temperature, thereby obtaining the heterocyclic onium ion type intrinsic flame-retardant thermoplastic polyurethane. The heterocyclic onium ion type intrinsic flame-retardant thermoplastic polyurethane is obtained. The obtained heterocyclic onium ion type intrinsic flame-retardant thermoplastic polyurethane is excellent in mechanical property, the tensile strength is larger than 17 MPa, the flame-retardant limit oxygen index LOI value reaches 27.2%, and the heat release peak value finally reaches 607 kW / m < 2 >. Compared with non-ionic flame-retardant thermoplastic polyurethane, the heterocyclic onium ionic polyurethane has the advantage that the flame retardant property is obviously improved.

This invention belongs to the field of polymer materials technology, and specifically relates to a high glow wire and high limiting oxygen index flame-retardant ABS material, its preparation method, and its application. The flame-retardant ABS material comprises the following raw materials in the indicated mass percentages: 55%–80% ABS resin, 5%–16% brominated flame retardant, 2%–6% synergistic flame retardant, 2%–10% magnesium salt whiskers, 4%–10% water-washed montmorillonite, and processing aids; the synergistic flame retardant includes zinc stannate. The flame-retardant ABS material of this invention exhibits high glow wire and high limiting oxygen index.

This invention discloses a ceramicized flame-retardant PBT composite material containing a bio-based carbon source and its preparation method, belonging to the field of polymer materials technology. The composite material uses PBT resin as a matrix and contains the following components: 5-30 parts of bio-based carbon source, 5-25 parts of phosphorus-based flame retardant, 5-20 parts of ceramicizing agent, and 5-20 parts of flux, or 0.1-2 parts of anti-dripping agent and 0.1-1 parts of antioxidant. Specifically, the bio-based carbon source is esterified cellulose or hyperbranched bio-based polyester. This invention constructs a quaternary synergistic system of bio-based carbon source-phosphorus-based flame retardant-ceramicizing agent-flux, which catalyzes the formation of a robust and dense ceramic protective layer during combustion, endowing the material with excellent flame-retardant properties, achieving a UL-94 V-0 rating and a limiting oxygen index greater than 30%, while maintaining the mechanical properties of the matrix. The process is simple, suitable for industrial production, and can be widely used in fields with high flame-retardant safety requirements, such as electronics, electrical appliances, and automobiles.

The invention relates to a waterborne polyurethane emulsion as well as a preparation method and application thereof. The preparation raw materials of the waterborne polyurethane emulsion comprise the following components: an isocyanate monomer, flame-retardant polyether polyol, polydimethylsiloxane, a hydrophilic chain extender and a small molecular alcohol chain extender. The flame-retardant polyether polyol is a polymer formed by [(bis (2-hydroxyethyl) amino) methyl] diethyl phosphate and an epoxy compound. According to the synthesized waterborne polyurethane coating, the synergistic effect of nitrogen, phosphorus and silicon is utilized, flame propagation can be effectively inhibited, the molten drop phenomenon can be remarkably inhibited, and the limit oxygen index and the vertical combustion grade of the material are greatly improved.

The invention relates to a preparation method of a flaky magnesium hydroxide flame retardant, belonging to the technical field of inorganic material preparation, and the preparation method of the flaky magnesium hydroxide flame retardant comprises two steps of precipitation method synthesis and epoxy coating. According to the obtained flaky magnesium hydroxide flame retardant, the particle size distribution tested by a laser particle size analyzer is that D10 is 0.022-0.034 [mu] m, D50 is 0.591-0.608 [mu] m, and D90 is 1.398-1.749 [mu] m, 40 wt% of the flaky magnesium hydroxide flame retardant is added into EVA, the limit oxygen index of the EVA is increased to 31.1-32.0%, and the UL94 vertical combustion grade can reach V-1.

The present application relates to the technical field of paint, and discloses a preparation method of a spherical alumina-cordierite composite refractory paint composition, wherein 100 parts by weight of epoxy resin, 1-5 parts by weight of an amino-terminated polymer ultraviolet absorber, 15-28 parts by weight of a filler spherical alumina trihydrate and cordierite, 29-32 parts by weight of a curing agent and the like are stirred and uniformly mixed to obtain the spherical alumina-cordierite composite refractory paint composition.The polymer ultraviolet absorber contains an ortho-hydroxybenzotriazole group, which can improve the ultraviolet absorption characteristics and ultraviolet aging resistance of the paint.The polymer, as an absorber, contains a biphenyl structure with thermal stability, which is beneficial to improving the thermal decomposition temperature, heat resistance and water resistance after being co-cured with the epoxy resin.The addition of the spherical alumina trihydrate and cordierite improves the limiting oxygen index of the paint coating and improves the flame-retardant fire resistance.

This invention discloses a Ca²⁺ cross-linked bilayer phosphorus-nitrogen hybrid flame-retardant coated PET fabric and its preparation method. The fabric uses PET fabric as a substrate, with a bottom flame-retardant layer and a top cross-linked layer sequentially loaded from bottom to top. The bottom flame-retardant layer is loaded with lithium bentonite and phytic acid, and the top cross-linked layer is loaded with lithium bentonite and sodium alginate. The top cross-linked layer undergoes Ca²⁺ cross-linking treatment to form a network chelated with calcium ions. The preparation process involves PET pretreatment, bottom coating, top coating, and calcium ion chelation cross-linking, all using an aqueous phase and without organic solvents, resulting in environmentally friendly raw materials and low energy consumption. The prepared fabric achieves a limiting oxygen index of over 33%, exhibits self-extinguishing properties during vertical burning, and produces no dripping, solving the problems of easy peeling and rapid performance degradation of traditional flame-retardant coatings after washing.

The invention discloses a flame-retardant modified phenolic aerogel composite material and a preparation method thereof, and the method comprises the following steps: mixing phenolic resin, an alcohol pore-forming agent, a flame retardant containing phosphorus and nitrogen elements, a curing agent and a surface modifier according to a specific mass ratio to prepare a precursor solution; and dipping a fiber fabric in the solution, and sequentially carrying out curing, flame-retardant modified solvent replacement, normal-pressure drying and vacuum drying to obtain the composite material. The flame-retardant modified solvent is replaced by a boric acid solution or an ammonium borate solution. Through an innovative step-by-step flame-retardant strategy, the phosphorus-nitrogen flame retardant is fixed on a gel network, and a flame-retardant layer is introduced on the pore surface through replacement of a boron-containing solution, so that synergistic interaction of a flame-retardant function is realized. According to the method, the limit oxygen index and the thermal stability of the material are remarkably improved, meanwhile, the low-density and low-thermal-conductivity nano-porous structure of the material is well maintained, expensive supercritical drying is successfully replaced with normal-pressure drying, and the production cost is greatly reduced.

The application discloses a polymer type nitrogen and phosphorus flame retardant as well as preparation and application thereof, and belongs to the technical field of high polymer material modification. The polymer type nitrogen and phosphorus flame retardant is prepared through a multi-component reaction, the method has mild reaction conditions, does not need an external catalyst, and has high atomic economy. The polymer type nitrogen and phosphorus flame retardant prepared has high thermal decomposition temperature, good compatibility when used for preparing a flame-retardant polylactic acid product, and can synergistically prevent the polylactic acid from burning through the two kinds of flame-retardant elements of nitrogen and phosphorus; the limiting oxygen index reaches 31%, the flame-retardant grade requirement of UL-94 V-0 is met, and the mechanical property is excellent.

The invention discloses a carbon fiber flame-retardant composite plastic and a preparation method thereof, and belongs to the technical field of composite plastic preparation, the carbon fiber flame-retardant composite plastic comprises: 50-80% of a polymer matrix, the polymer matrix is a mixture of a main resin and a flexibilizer, the main resin is at least one of polyamide 6, polyamide 66, polybutylene terephthalate or polycarbonate, and the flexibilizer is at least one of a flexibilizer and an antioxidant. The flexibilizer is a maleic anhydride grafted polyolefin elastomer, and the content of the flexibilizer accounts for 5-15% of the total mass of the polymer matrix; and 15%-40% of surface modified carbon fibers. A synergistic modification layer of a nitrogen-phosphorus intumescent flame retardant and a two-dimensional nano material is constructed on the surface of the carbon fiber through a chemical grafting technology, nano-scale dispersion and firm loading of flame-retardant components are achieved, the composite material can rapidly form a compact and stable intumescent carbon layer during combustion, the limit oxygen index is increased and passes the UL-94V-0 grade, and the flame-retardant performance of the composite material is improved. The problems of low flame retardant efficiency and poor durability caused by non-uniform dispersion and easy migration of a traditional physical blending flame retardant are solved.