2172 results about "Fire retardant" patented technology

A long-term fire retarding biochemical liquid composition including: a dispersing agent realized in the form of a major amount of water, for dispersing alkali metal ions dissolved in the water; a major amount of a first fire retarding agent realized in the form of a primary alkali metal salt of a nonpolymeric saturated carboxylic acid, for example, tripotassium citrate, for providing metal potassium ions dispersed in the water when the at least one alkali metal salt is dissolved in the water to form a mixed retardant solution; a minor amount of a second fire retarding agent realized in the form of a secondary alkali metal salt of a nonpolymeric saturated carboxylic acid, for example, potassium, sodium, calcium and / or magnesium benzoate, for providing benzoate ions dispersed in the water when the secondary alkali metal salt is dissolved in the mixed retardant solution, for functioning as a secondary fire retardant agent.

The invention belongs to the field of plastic product production, and particularly relates to a composite material for preparing a textile dyeing tube. The composite material mainly comprises the following components in parts by weight: 10 parts of PET resin, 10 parts of ASA resin, 1-6 parts of matt master batches, 1-3 parts of titanium dioxide, 1-2 parts of rosin, 0-1.5 parts of an antioxidant, 0-1 part of a fire retardant and 1-2 parts of a lubricating agent, wherein titanium dioxide is rutile titanium dioxide. Compared with the prior art, the components are good in compatibility; the molded product has excellent physical and mechanical properties, low glossiness, high strength (caused by titanium dioxide) and good tenacity, and is suitable for injection molding of plastic products; the metallic luster caused by titanium dioxide can be reduced; the noise can be reduced; titanium dioxide can be used for disinfecting under irradiation of an ultraviolet lamp; the composite material is very convenient; and the lubricating agent is added, so that the surface is relatively smooth.

The invention discloses a silica gel pad with high thermal conductivity and heat resistance and a preparation method thereof, and the method comprises the following steps: preparing a composite thermal conductive filler, mixing boron nitride nanosheets and graphene according to a certain mass ratio, adding a silane coupling agent, carrying out ball milling, adding spherical alumina, and mixing; preparing modified organic silicon resin, wherein methyl vinyl silicone rubber, hydrogen-containing silicone oil, a platinum catalyst and MQ silicon resin react to obtain the modified organic silicon resin; mixing and defoaming the modified organic silicon resin, the composite heat-conducting filler, the flame retardant and the antioxidant to obtain a heat-conducting silica gel mixture; preparing a reinforced base material, carrying out plasma treatment on glass fiber cloth, and then impregnating the glass fiber cloth with vinyl ester resin for pre-curing; and grinding the mixture by three rollers, coating the mixture on a reinforced base material, and heating and curing. The thermal conductivity of the obtained silica gel pad is 2.5-3.5 W / m.K, the volume resistivity is larger than 1012 omega.cm, the long-term heat-resistant temperature reaches 200 DEG C or above, the tensile strength is larger than 5 MPa, the peel strength is larger than 15 N / cm, and the silica gel pad has excellent thermal conductivity, insulativity, heat resistance and mechanical strength.

The invention provides a high-hydrophobicity anti-pollution flashover coating and a preparation method thereof, and relates to the field of coatings. The silicone rubber composition is prepared from the following raw materials in parts by weight: 80 to 100 parts of hydroxyl-terminated polydimethylsiloxane; 5 to 15 parts of modified nano silicon dioxide; 10 to 30 parts of a composite self-repairing microcapsule; 10 to 25 parts of a flame retardant; 3-8 parts of a cross-linking agent; 0.5-2 parts of a catalyst; 1-5 parts of an accelerant; 40 to 100 parts of a solvent; the modified nano silicon dioxide is fumed silica subjected to surface treatment by a fluorine-containing silane coupling agent and a platinum catalyst; the capsule wall of the composite self-repairing microcapsule is a polylactic acid-glycolic acid copolymer, and the capsule core of the composite self-repairing microcapsule is a mixed solution of a hydroxyl-terminated polydimethylsiloxane oligomer and methyltris (methylethylketoximino) silane. The coating has excellent hydrophobicity, weather resistance and targeted repair function.

Disclosed in the present invention are a reinforced polyurethane rigid foam material and a preparation method therefor, belonging to the technical field of high polymer materials. The material comprises: 5-10 parts of glass fiber yarn, 40-60 parts of an aromatic polyether polyol, 30-50 parts of an aromatic polyester polyol, 30-50 parts of toluene diisocyanate, 40-60 parts of polymethylene polyphenyl polyisocyanate, 5-10 parts of a flame retardant, 5-15 parts of a foaming agent, 1-5 parts of a catalyst and 1-5 parts of a surfactant. The present invention can achieve continuous production of the reinforced polyurethane rigid foam material and can improve the tensile property of the material by 20% or above and increase the utilization rate of glass fibers by 5% or above. The reinforced polyurethane rigid foam material can be widely applied to the field of liquefied gas storage and transportation.

The high-performance insulation blanket comprises a surface layer, an EVA adhesive layer and a surface layer which are sequentially arranged, and the surface layer and the EVA adhesive layer are attached in a calendering mode; the surface layer is prepared from the following raw materials in parts by weight: 45 to 55 parts of ethylene-vinyl acetate copolymer, 10 to 20 parts of natural rubber, 8 to 18 parts of PA6 short fiber, 7 to 10 parts of dopamine modified mica powder, 6 to 10 parts of MAH-g-EVA, 10 to 15 parts of flame retardant, 0.2 to 0.4 part of antioxidant, 0.8 to 1.2 parts of lubricant and 2 to 4 parts of coloring agent. In the surface layer formula system, under the synergistic effect of the natural rubber, the PA6 short fiber and the dopamine modified mica powder, the tear resistance and puncture resistance of the material are greatly improved, and meanwhile, the material has excellent comprehensive properties such as high temperature resistance, insulation, flame retardance and aging resistance, and is suitable for the field of high-requirement insulation protection.

The invention relates to the technical field of crosslinked polyethylene insulated power cables, in particular to a flame-retardant and insulated low-voltage power cable and a preparation method and application thereof. The flame-retardant and insulating low-voltage power cable comprises the inner core layer, the filler layer, the belting layer, the lining layer, the metal armor layer and the outer sheath layer from inside to outside, and the multiple layers can effectively protect the inner core and endow the cable with better performance; in addition, low-density polyethylene, a furan modified polyethylene compatilizer, a reactive flame retardant, bismaleimide, dicumyl peroxide and an auxiliary are adopted to obtain the cross-linked polyethylene material for the cable outer sheath, and the cross-linked polyethylene material has excellent insulation, flame retardance, strength, toughness and repairing performance.

The invention discloses a corrosion-resistant protective sleeve for an aluminum alloy cable and a preparation method of the corrosion-resistant protective sleeve, and belongs to the field of cable protective sleeves. The corrosion-resistant protective sleeve for the aluminum alloy cable is prepared from the following raw materials in parts by mass: 40 to 50 parts of ethylene propylene diene monomer, 15 to 25 parts of fluorinated silicone rubber, 5 to 10 parts of modified thiolated ethylene-vinyl alcohol copolymer, 8 to 15 parts of metal fluoride nanocrystal, 4 to 8 parts of vulcanizing agent, 3 to 8 parts of plasticizer and 3 to 5 parts of flame retardant. The two rubber matrixes are compounded to form a physical barrier layer to prevent corrosion media and water molecules from permeating, material pores can be filled with the metal fluoride nanocrystals, diffusion channels of the corrosion media are reduced, and hydrophobicity and corrosion resistance are improved through cooperation of the metal fluoride nanocrystals and the fluorinated silicone rubber. The modified thiolated ethylene-vinyl alcohol copolymer can improve the compatibility between rubber matrixes and form coordination with metal ions of the metal fluoride nanocrystals, so that the diffusion path of a corrosive medium is prolonged, and the corrosion of the corrosive medium is synergistically blocked.

The invention provides a high-temperature-resistant corrosion-resistant cable material for a control line and a preparation method of the high-temperature-resistant corrosion-resistant cable material, and belongs to the field of metallocene polyolefin materials. The cable material is prepared from the following chemical raw materials: 45 to 65 parts of maleic anhydride grafted metallocene polyolefin, 5 to 10 parts of maleic anhydride grafted polyolefin elastomer, 3 to 6 parts of epoxy group modified polyhedral oligomeric silsesquioxane, 2 to 5 parts of polyether amine, 5 to 10 parts of ion response type core-shell structure sustained release microspheres, 8 to 15 parts of multi-dimensional reinforcement, 15 to 25 parts of halogen-free flame retardant, 0.5 to 1.5 parts of antioxidant and 0.5 to 1.5 parts of processing aid. The chemical raw materials with specific functions are accurately selected, a synergistic effect system is constructed, and meanwhile, the high temperature resistance and corrosion resistance of the cable material for the control line are improved.

The invention discloses a crosslinked polyethylene low-smoke halogen-free flame-retardant power cable which comprises the following hierarchical structures: a conductor layer; an insulating layer; a shielding layer; the shielding layer takes polyethylene as a matrix and comprises the following components in parts by weight: 70-78 parts of matrix, 20-25 parts of carbon black and 2-5 parts of nano montmorillonite modified lignin, the thickness of the shielding layer is 0.8-1.2 mm, the shielding layer and the insulating layer are molded through a co-extrusion process, and the interface gap is less than or equal to 0.1 mm. The nano montmorillonite modified lignin is adopted as a core flame retardant, the addition amount is reduced by 10%-15% compared with that of a traditional halogen-free flame retardant, by taking a 120 mm civil cable as an example, 18 parts of modified lignin replace 25 parts of a traditional flame retardant with the same flame retardant effect, the raw material cost is reduced by 8%-12%, lignin is derived from agricultural and forestry wastes, dependence on a petroleum-based material is reduced, and the environment-friendly flame-retardant cable material is suitable for industrial production. The gradient cooling process shortens the cooling time by 20%-30% compared with the traditional single-section cold water cooling process, and meanwhile, the pre-crosslinking process reduces the subsequent forming internal stress and reduces the rejection rate.

The invention discloses a high-oxidation-resistance long-life polyethylene cable sheath material and a preparation method thereof, and relates to the technical field of high polymer materials. Comprising the following components: high-molecular-weight high-density polyethylene, surface-modified nano-dioxide, furan-maleimide grafted polyethylene, a Schiff base dynamic cross-linking agent, tea polyphenol grafted polyethylene, a temperature-responsive oxygen-blocking microcapsule, a main antioxidant, an auxiliary antioxidant, an emergency antioxidant, a light stabilizer, a halogen-free flame retardant, a processing aid and an acid absorbent. According to the invention, the main antioxidant, the auxiliary antioxidant and the tea polyphenol grafted polyethylene form a chemically synthesized and naturally modified composite antioxidant system, the designed service life of the material is greatly prolonged, the temperature-responsive oxygen-blocking microcapsule automatically cracks to release the core material when the operating temperature of the cable is greater than or equal to 90 DEG C, a dynamic oxygen-blocking layer is formed, and the service life of the cable is prolonged. The defect that the effect of traditional physical oxygen barrier is attenuated at high temperature is overcome, and the oxygen permeability at high temperature is reduced compared with that of a single nano barrier scheme.

The invention relates to the technical field of polyolefin cable materials, in particular to a photovoltaic weather-resistant anti-cracking low-smoke halogen-free flame-retardant polyolefin cable material and a preparation method thereof.The photovoltaic weather-resistant anti-cracking low-smoke halogen-free flame-retardant polyolefin cable material is prepared from, by weight, 90-150 parts of polyolefin resin, 1-3 parts of antioxidant, 2-5 parts of ultraviolet light absorber, 30-70 parts of composite flame retardant, 10-25 parts of carbon black and 3-5 parts of cross-linking agent; the composite flame retardant comprises a core material, a first shell material and a second shell material, the core material comprises a halloysite nanotube adsorbed with a flame retardant, the first shell material comprises epoxy resin, and the second shell material comprises maleic anhydride grafted polyethylene. According to the polyolefin cable material provided by the invention, the purpose of efficient flame retardance can be achieved by adding the halloysite nanotubes and the flame retardant system, the interfacial compatibility between the flame retardant and the matrix resin can be improved by adding the maleic anhydride grafted polyethylene, and the flame retardance of the polyolefin cable material can be improved by combining the added halloysite nanotubes and epoxy resin. The purpose of improving weather resistance, stress resistance and crack resistance of matrix resin is achieved.

The invention discloses a cable insulating material which comprises the following components in parts by weight: 40-60 parts of low-density polyethylene, 20-30 parts of an ethylene-vinyl acetate copolymer EVA, 2-5 parts of a composite anti-aging agent, 5-10 parts of a core-shell structure nano composite modifier, 1-2 parts of a lubricant, 3-8 parts of a compatilizer, 20-30 parts of a composite flame retardant, 5-10 parts of a nano reinforcing agent and 2-4 parts of phenylsilane. The core-shell structure modifier strengthens interface bonding, and cooperates with the modified nano reinforcing agent to disperse stress, so that the mechanics and high and low temperature resistance are improved; the composite anti-aging agent inhibits multi-path aging and improves the aging resistance. The material has the advantages of excellent mechanical properties, high and low temperature resistance and outstanding aging resistance, and meets the insulation quality and efficiency requirements of cables in complex use environments.

The invention relates to the field of drag chain cables, in particular to a high-flexibility shielding type drag chain cable and a preparation method thereof. The drag chain cable sequentially comprises a conductor layer, a shielding layer and a sheath layer from inside to outside. The conductor layer is formed by compositely twisting silver-plated copper wires and carbon fibers; the shielding layer comprises an inner shielding layer and an outer shielding layer, the inner shielding layer is wrapped by an aluminum-plastic composite belt, and the outer shielding layer is a tinned copper wire woven mesh. The sheath layer comprises the following components: a modified polyurethane elastomer, an ethylene-vinyl acetate copolymer, nitrile rubber, a composite flame retardant, a plasticizer, an antioxidant, a light stabilizer and a lubricant. Through the structural design of the conductor layer, the shielding layer and the sheath layer and the optimization of the material formula of the sheath layer, the problems that an existing drag chain cable is insufficient in strength and flexibility, limited in shielding effectiveness, poor in wear resistance and weather resistance and difficult to consider both flame retardance and mechanical property are solved.

The invention discloses a phosphorus-nitrogen-silicon synergistic flame retardant containing a POSS (Polyhedral Oligomeric Silsesquioxane) structure and a preparation method of the phosphorus-nitrogen-silicon synergistic flame retardant. The flame retardant integrates three elements of phosphorus, nitrogen and silicon, and can generate a better flame-retardant synergistic effect; meanwhile, the POSS structure and the phenyl structure in the flame retardant endow the flame retardant with good heat resistance and good compatibility with a matrix material polycarbonate (PC), and the flame retardant is suitable for high-temperature processing conditions. In addition, the preparation method of the flame retardant is simple in process, the yield reaches up to 85% or above, and industrial production is easy to achieve.

The invention relates to the technical field of cables, and provides a medium-voltage power cable and a manufacturing method thereof.The medium-voltage power cable sequentially comprises a conductor, a conductor shielding layer, an insulating layer, an insulating shielding layer, a metal shielding layer, a lining layer, an armor layer and a sheath layer from inside to outside; the sheath layer comprises the following raw material components in parts by weight: 100 parts of polyvinyl chloride, 20-25 parts of a flame retardant, 30-40 parts of a plasticizer, 1-3 parts of an antioxidant and 20-25 parts of an inorganic composite material; the inorganic composite material is obtained by treating white carbon black with lignin and polyethylene glycol dimethacrylate, crushing and carbonizing. According to the technical scheme, the problem that the low temperature resistance of the medium-voltage power cable sheath layer is insufficient in the prior art is solved.

The invention relates to the technical field of fire extinguishing microcapsules, in particular to a high-airtightness perfluorohexanone fire extinguishing microcapsule and a preparation method and application thereof.The perfluorohexanone fire extinguishing microcapsule comprises a composite shell layer and a fire extinguishing core, and the composite shell layer is made of ethylene-vinyl alcohol copolymer resin and silicon dioxide nanoparticles; the fire extinguishing core is a perfluorohexanone fire extinguishing agent and is applied to preparation of indoor fire extinguishing pastes, fireproof coatings and polyurethane adhesive materials. According to the perfluorohexanone fire extinguishing microcapsule disclosed by the invention, the diffusion of low-polarity perfluorohexanone is effectively prevented by utilizing the strong hydrogen-bond interaction between hydroxyl groups in the ethylene-vinyl alcohol copolymer resin, and especially under the condition of relatively high temperature, the perfluorohexanone fire extinguishing microcapsule has a good fire extinguishing effect. The problem that an existing perfluorohexanone fire extinguishing microcapsule is poor in long-term air tightness under the condition of high encapsulation efficiency is effectively solved, and meanwhile harmful substances such as formaldehyde cannot be generated.

The invention discloses a thermal runaway suppression device combining a filling type flame-retardant capsule and battery heat insulation-flame retardance-liquid cooling, belongs to the field of battery safety, and is suitable for thermal runaway management of an energy storage system and an electric vehicle battery pack. The device comprises a filling type flame-retardant capsule, a flame-retardant heat insulation assembly, a liquid cooling assembly, an air cooling system, a monitoring unit and a controller, the filling type flame-retardant capsule is in a folded state before being triggered, is filled with a flame retardant and is provided with a gas production device, and the gas production device is inflated to enable the filling type flame-retardant capsule to expand to fill gaps of a battery pack and physically isolate a high-temperature area; and when the internal gas pressure exceeds a threshold value, the filling type flame-retardant capsule is broken, and the internal flame retardant is released to the surface and gaps of the battery module, so that thermal runaway spreading is delayed. The filling type flame-retardant capsule is introduced, so that a multi-stage protection mechanism of active triggering, gap filling and directional agent release can be formed, and the timeliness and comprehensiveness of thermal runaway inhibition are further improved.

The invention relates to an epoxy resin composite insulating material and a preparation method and application thereof, and belongs to the technical field of insulator equipment. The epoxy resin composite insulating material is prepared from the following raw materials: epoxy resin, nano filler, a surface modifier, aluminum oxide particles, a flame retardant, an organic solvent, a curing agent and an accelerant. The nanofiller is at least one of the following nanoscale materials: titanium dioxide, graphene oxide, carbon nitride, zinc oxide, boron nitride and silicon dioxide; the surface modifier is a silane coupling agent and is used for surface modification of the nano filler; the flame retardant is at least one of a phosphorus flame retardant, a nitrogen-phosphorus synergistic flame retardant and a brominated flame retardant. The insulating material provided by the invention has high thermal stability, high insulativity and carbon precipitation inhibition capability, can effectively inhibit carbon precipitation of epoxy resin under the action of thermal and electric stress, and has good comprehensive performance.

The invention relates to the technical field of cables, and provides a high-toughness corrosion-resistant medium-voltage power cable, which comprises a conductor, and an insulating layer, a shielding layer, an armor layer and a sheath layer which are sequentially arranged outside the conductor, the sheath layer comprises the following components in parts by weight: 70-100 parts of polyvinyl chloride, 30-40 parts of nitrile rubber, 10-15 parts of a flame retardant, 15-20 parts of a plasticizer, 1-3 parts of an antioxidant, 5-10 parts of a filler, 2-4 parts of a heat stabilizer, 1-3 parts of a compatilizer and 0.5-2 parts of a cross-linking agent; the filler is prepared from the following raw materials in parts by weight: 100 parts of calcium carbonate, 20 to 24 parts of 2-ethylhexyl acrylate and 6 to 10 parts of acrylic acid. According to the technical scheme, the problem of poor corrosion resistance of the medium-voltage power cable in the prior art is solved.

The invention relates to the technical field of PC alloys, in particular to an impact-resistant flame-retardant PC alloy with melt flowability and a preparation method of the impact-resistant flame-retardant PC alloy with melt flowability, and the impact-resistant flame-retardant PC alloy with melt flowability comprises the following components in parts by mass: 60-70 parts of PC resin; 30 to 40 parts of ABS resin; 6-10 parts of a core-shell flame retardant; 5-8 parts of a toughening agent; 0.5 to 1.0 part of a compatilizer; 0.3 to 0.5 part of an antioxidant; 1.0 to 1.5 parts of other auxiliary agents; the core-shell flame retardant comprises nano SiO2 loaded with sulfonate, low-molecular-weight PC (polycarbonate) and epoxy polysiloxane in sequence from inside to outside, wherein the weight-average molecular weight of the low-molecular-weight PC is 5000-8000; the toughening agent is prepared by mixing an organic silicon toughening agent, MBS and hydrogenated SBS; the serious negative influence of the existing flame retardant on the mechanical property and the processability of the PC / ABS alloy is overcome, so that the material meets the UL94 V0 level, and meanwhile, the balance optimization among the properties is realized.

The application discloses a kind of flame-retardant expandable polystyrene and its preparation method.It includes the following raw materials: styrene, nucleating agent, desalted water, organic compound containing peroxide functional group, inorganic salt, bromine flame retardant, dispersant, solvent.The product powder and bulk material prepared by the application are less, and the prepared polystyrene board has excellent mechanical properties.After one week or even one month, no collapse, deformation and other phenomena occur, the combustion performance completely reaches B level, and has efficient flame-retardant fireproof performance.Meanwhile, the product obtained by the application has high bromine content, good thermal stability, low bleeding, no toxicity, little influence on material mechanical properties, and no toxic gas such as polybrominated dibenzo-p-dioxin and polybrominated dibenzofuran is produced during thermal cracking or combustion, which completely meets the requirements of European dioxin regulations and does not harm the environment.

The invention relates to a wear-resistant self-curing insulating coating material and a preparation method thereof, and belongs to the technical field of coatings. Comprising the following components in parts by weight: 50-80 parts of epoxy resin, 5-10 parts of polydimethylsiloxane, 5-15 parts of a curing agent, 15-30 parts of filler, 2-5 parts of a dispersing agent, 3-5 parts of a flatting agent, 5-15 parts of a wear-resistant agent, 5-8 parts of a flame retardant, 3-5 parts of a coupling agent and 1-3 parts of pigment. The coating material prepared by the invention uses a light filler, has an ultra-light characteristic, has excellent insulativity and wear resistance, and can be self-cured at room temperature.

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.

This invention belongs to the technical field of cable sheath materials, specifically disclosing a waterproof and corrosion-resistant cable sheath material and its preparation method. The waterproof and corrosion-resistant cable sheath material comprises the following raw materials in parts by weight: 40-60 parts polyethylene, 15-20 parts acrylate rubber, 10-20 parts plasticizer, 10-15 parts compatibilizer, 3-5 parts lubricant, 1-5 parts antioxidant, 2-10 parts flame retardant, 5-10 parts modified carbon nanotubes, and 3-5 parts lignin derivatives. The addition of modified carbon nanotubes and lignin derivatives not only helps improve the mechanical properties of the cable sheath material but also endows it with excellent waterproof and corrosion-resistant capabilities.

The invention discloses a composite material with a shielding function, a preparation method thereof and an interphone shell. The composite material comprises a polycarbonate-acrylonitrile-butadiene-styrene copolymer, a modified conductive filler, maleic anhydride grafted polyethylene, polyaryletherketone, a flame retardant, an antioxidant, glass microfibers and a compatilizer, wherein the modified conductive filler is aluminum oxide ceramic particles subjected to chemical copper plating and graft polymerization treatment. The preparation method comprises the steps of modified conductive filler preparation, step-by-step raw material mixing, twin-screw extrusion granulation and drying. The interphone shell is prepared from the composite material through injection molding, and the injection molding process comprises the steps of raw material drying, injection molding machine preheating, charging and injection molding, and demolding and finishing. The composite material is stable in electromagnetic shielding performance and has good mechanical strength and heat resistance; the preparation method can improve the dispersity of the components and is adaptive to conventional equipment; the interphone shell can block electromagnetic wave interference, is suitable for being used in multiple environments, and meets the requirements of an electronic equipment shell for shielding and structural performance.

The invention discloses a method for detecting the purity of a phosphorus-containing flame retardant, and belongs to the technical field of flame retardant detection. The specific test method comprises the test steps of selecting a solvent, preparing a to-be-tested solution, determining the maximum absorption wavelength, determining absorbance, calculating the purity of a sample and the like, and analyzing and processing an experimental result. The solvent is filtered through a 600-mesh screen, the influence of impurities in the solvent on an experimental result is eliminated, and the scientificity of the experimental result is ensured by parallelly determining the average value recorded for three times; the testing method has the advantages of low cost, simplicity and convenience in operation, short detection period and the like, and can realize rapid detection of a plurality of samples based on multiple stations of an ultraviolet-spectrophotometer, so that the working efficiency is improved; meanwhile, the method for detecting the purity of the phosphorus-containing flame retardant provided by the invention can be used for comparing the quality of products from different manufacturers and the batch stability of the products at the same time, and is beneficial for enterprises to control the quality of the products.

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 discloses a foamed polyphenyl ether bead and a preparation method thereof. The material is prepared by compounding polyphenyl ether, a styrene polymer, a three-dimensional fiber microsphere reinforcement, a CNTs coated SiO2 core-shell nucleating agent, modified resin, a flame retardant and an antioxidant according to a specific ratio. The innovation of the invention lies in that a three-dimensional reinforcement with glass beads as a core and carbon fibers as a network and a composite foaming agent with silicon dioxide coated with carbon nanotubes are introduced to synergistically improve the cellular structure and mechanical properties. The preparation process comprises the key steps of component drying, melt blending granulation, carbon dioxide physical foaming under an autoclave aqueous dispersion system and the like. Through component design and surface modification, the foamed bead has the advantages of light weight, high strength, flame retardance and uniform foam structure, and is suitable for the fields of high-end heat insulation and bearing.

The invention relates to the technical field of fireproof plates, in particular to a basalt fiber fireproof plate based on a carbon-based protective layer and a preparation method of the basalt fiber fireproof plate, and the basalt fiber fireproof plate comprises the following raw materials in parts by weight: 90-100 parts of epoxy resin, 20-30 parts of a curing agent, 15-25 parts of modified basalt fibers, 10-20 parts of filler, 40-60 parts of a flame retardant, 1-2 parts of a coupling agent and 0.5-1 part of a defoaming agent. According to the preparation method, the basalt fiber is prepared through multi-step reaction of pretreatment, impregnation, pre-oxidation and carbonization, the basalt fiber is impregnated in treatment liquid with polyacrylonitrile as a precursor, polymer molecules are effectively attached, and the interface debonding phenomenon at high temperature is effectively inhibited through subsequent pre-oxidation and carbonization treatment under specific atmosphere and temperature programming; the excellent mechanical property stability of the material is kept in a long-term high-temperature environment.