4492 results about "Fire retardant" patented technology

A forest fire retardant composition contains a retardant compound that includes a phosphate salt. The phosphate salt may include diammonium phosphate, diammonium orthophosphate, monoammonium phosphate, monoammonium orthophosphate, monosodium phosphate, disodium phosphate, disodium phosphate hydrate, sodium ammonium phosphate, sodium ammonium phosphate hydrate, sodium tripolyphosphate, trisodium phosphate, or dipotassium phosphate, and combinations thereof. The forest fire retardant composition may include an ammonium source. The composition may be in the form of a dry concentrate, a liquid concentrate, or a final diluted product. The final diluted product is effective in suppressing, retarding, and controlling forest fires while exhibiting corrosion resistance and low toxicity.

A 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 first alkali metal salt of a nonpolymeric saturated carboxylic acid, specifically, 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 second alkali metal salt of a nonpolymeric saturated carboxylic acid, specifically, sodium benzoate (SB), for providing metal sodium ions dispersed in the water when the at least one alkali metal salt is dissolved in the mixed retardant solution, for functioning as a secondary fire retardant agent and also inhibiting surface corrosion reactions involving metals contacting the mixed retardant solution, including specific metals, namely 2024-T3 Aluminum, 4130 Steel, Yellow Brass, and Az31B Magnesium; a minor amount of thickening agent in the form of a biomolecular polymer consisting of polysaccharides, for increasing the viscosity of the mixed retardant liquid during application operations; a minor amount of coloring agent in the form of fugitive color dye powder, or non-fugitive pigment powder, for imparting a visible color (e.g. red or green) when the fire retarding biochemical liquid composition is applied to a surface to be protected against fire, as water molecules in the retardant liquid coating evaporate to the environment during drying, to form a thin fire retardant coating deposited on the treated surfaces having a characteristic visible color, and comprising potassium and sodium salt crystals mixed within the polysaccharides of the biomolecular polymer. Wet and dry concentration formulations of the fire retarding biochemical liquid composition are disclosed for use with both serial and ground delivery methods and apparatus.

A forest fire retardant composition contains a retardant compound that includes a phosphate salt. The phosphate salt may include diammonium phosphate, diammonium orthophosphate, monoammonium phosphate, monoammonium orthophosphate, monosodium phosphate, disodium phosphate, disodium phosphate hydrate, sodium ammonium phosphate, sodium ammonium phosphate hydrate, sodium tripolyphosphate, trisodium phosphate, or dipotassium phosphate, and combinations thereof. The forest fire retardant composition may include an ammonium source. The composition may be in the form of a dry concentrate, a liquid concentrate, or a final diluted product. The final diluted product is effective in suppressing, retarding, and controlling forest fires while exhibiting corrosion resistance and low toxicity.

A forest fire retardant composition contains a retardant compound that includes a potassium salt. The potassium salt may include a potassium salt of an organic acid, a potassium salt of an inorganic acid, or mixtures thereof. The organic acid may include formic acid, acetic acid, propanoic acid, butanoic acid, lactic acid, oxalic acid, malic acid, gluconic acid, tartaric acid, uric acid, malic acid, or citric acid. The inorganic acid may include sulfuric acid, phosphoric acid, carbonic acid, or hydrochloric acid. The composition may be in the form of a dry concentrate, a liquid concentrate, or a final diluted product. The final diluted product is effective in suppressing, retarding, and controlling forest fires while exhibiting corrosion resistance and low toxicity.

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.

A process or method for manufacturing a fire-retardant treated wood composite board or panel, such as oriented-strand board, with a low melting point fire retardant (FR) material, such as boric acid, while the press is operating at typical press temperatures above the FR material melting point. An intervening overlay is applied to the top surface of the mat on the forming line, after the use or application of any FR material within or on the mat, prior to entry into the press. The intervening overlay covers the top surface so as to prevent the melting fire retardant material from contacting the press platen(s). After pressing, the intervening overlay may be removed from the top surface by sanding, buffing, or other methods. The intervening overlay also may be sized so as to extend over one or more edges of the underlying panel, for ease of removal post-process.

The invention relates to the technical field of cables, and provides an ultraviolet-resistant photovoltaic cable which sequentially comprises a conductor, an insulating layer, a lining layer, a shielding layer and an outer sheath from inside to outside, and the outer sheath is prepared from the following raw materials in parts by weight: 35-45 parts of chloroprene rubber, 20-25 parts of ethylene propylene rubber, 25-35 parts of a flame retardant, 1-3 parts of a vulcanizing agent, 3-5 parts of an antioxidant, 0.8-1.2 parts of an ultraviolet absorbent, 3-5 parts of a lubricant and 15-25 parts of reinforcing filler; the reinforcing filler comprises lignin fibers and nano titanium dioxide, and the mass ratio of the lignin fibers to the nano titanium dioxide is (1: 5)-(5: 1). According to the technical scheme, the problems of poor mechanical property and ultraviolet resistance of the photovoltaic cable in the prior art are solved.

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 relates to the technical field of plastic packaging preparation, in particular to an anti-aging plastic packaging material and a preparation method thereof.The anti-aging plastic packaging material is prepared from, by mass, 100-140 parts of polylactic acid, 60-80 parts of PBAT, 2-5 parts of a composite anti-aging agent, 1-2 parts of a lubricant, 2-4 parts of a flame retardant and 3-6 parts of a compatilizer; the composite anti-aging agent comprises a modified anti-aging agent obtained by compounding functionalized montmorillonite and modified silicon dioxide, the functionalized montmorillonite is carnosic acid grafted rare earth ion modified montmorillonite, and the modified silicon dioxide is epoxy methyl oleate grafted silicon dioxide. According to the anti-aging plastic packaging material provided by the invention, a plastic material system with multiple protection mechanisms is constructed through the synergistic effect of all the components, and the prepared plastic packaging material not only keeps good biodegradability, but also has excellent ultraviolet light resistance and oxidation resistance.

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

The invention belongs to the technical field of polymer composite materials, and particularly relates to a high-strength flame-retardant composite material for pipelines and a preparation method thereof. The high-strength flame-retardant composite material for the pipeline is prepared from the following components in parts by weight: 70 to 80 parts of PA12T, 10 to 15 parts of a toughening agent, 20 to 30 parts of fiber reinforced filler, 8 to 16 parts of melamine polyphosphate, 1 to 6 parts of attapulgite, 2 to 4 parts of graphene, 0 to 3 parts of a coupling agent, 0 to 3 parts of a lubricating agent and 0 to 3 parts of an antioxidant. MPP is an N and P double-element synergistic flame retardant, and the flame retardant effect is better. Through the adsorption effect of the attapulgite, the dispersing performance of the MPP in the PA12T can be improved, and the precipitation phenomenon of the MPP can be prevented. The graphene is used as a common flame-retardant carbon-forming agent, and the lamellar structure of the graphene can play a role in resisting molten drops; and moreover, the graphene and the attapulgite with a rodlike structure interact with each other, so that the dispersion performance of the graphene, the attapulgite and the melamine polyphosphate in the nylon resin is promoted.

The invention discloses an environment-friendly high-strength water-stop belt and a preparation method thereof, and relates to the technical field of high-molecular compound composition water-stop belts. The environment-friendly high-strength water-stop belt is prepared from the following components in parts by mass: 100 parts of ethylene propylene diene monomer, 40 to 70 parts of reinforcing filler, 10 to 25 parts of environment-friendly plasticizer, 1 to 5 parts of interface modifier, 1.5 to 3.5 parts of vulcanizing agent, 3 to 8 parts of active agent, 1 to 3 parts of anti-aging agent and 5 to 15 parts of flame retardant. White carbon black and calcium carbonate are adopted as reinforcing filler to replace traditional carbon black, and energy consumption and pollution emission in the production process are remarkably reduced. By optimizing the formula and the preparation process, the tensile strength, the elongation at break, the tearing strength and other mechanical properties of the waterstop are remarkably improved. Aluminum hydroxide is added as a flame retardant, absorbs heat during thermal decomposition and forms a barrier layer, so that oxygen is effectively diluted, and fire spreading is prevented.

The invention discloses a low-temperature-resistant PVC / SEBS modified material and a preparation method thereof, and belongs to the technical field of high polymer materials. The PVC / SEBS modified material comprises the following raw materials in parts by weight: 80-100 parts of PVC, 20-40 parts of SEBS, 5-20 parts of a plasticizer, 6-10 parts of a cold-resistant agent, 2-4 parts of a flame retardant, 5-8 parts of an anti-aging agent, 2-3 parts of a stabilizer and 3-5 parts of a lubricant. The PVC / SEBS modified material prepared by the invention has excellent cold resistance.

The invention provides a polyamide composite material and application thereof. The polyamide composite material comprises the following components in parts by mass: 35-82 parts of polyamide resin, 5-45 parts of a reinforcing material and 5-25 parts of an organic phosphonate flame retardant, the water-soluble acid value of the organic phosphonate flame retardant is 0.1 to 0.3 mg KOH / g. By adopting the organic phosphonate flame retardant with a low acid value, the generation of dialkyl phosphinic acid decomposed in a high-temperature process can be slowed down, so that the amount of mold scale generated in an injection molding process of the polyamide composite material is obviously reduced, and the injection molding production efficiency is improved; meanwhile, the polyamide composite material has the advantages that the content of water boiling precipitates is obviously reduced, the damp-heat-resistant stability is excellent, and the service life of the polyamide composite material under damp-heat conditions is prolonged.

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

The invention provides a DOPO-HQ-based flame retardant, a preparation method and application thereof, a flame-retardant anti-dripping PET composite material and preparation thereof, and belongs to the technical field of flame retardants. The DOPO-HQ-based flame retardant provided by the invention contains an efficient phosphorus-based flame retardant DOPO structure, so that the composite material can be endowed with efficient flame-retardant self-extinguishing performance; besides, the DOPO-HQ-based flame retardant contains a triazine structure, is high in thermal stability and has excellent high-temperature carbonization capacity, so that a large number of carbon layers are generated in the combustion process of the composite material and cover the surface of a base material, and the effects of molten drop resistance and smoke suppression are achieved. The thermal performance of the flame-retardant PET composite material prepared from the DOPO-HQ-based flame retardant is similar to that of pure PET, and the flame-retardant PET composite material has the characteristics of high flame-retardant efficiency, no halogen, no molten drop, low smoke release amount and the like under the condition of a small addition amount (2-8wt%) (the current commercially available flame-retardant anti-molten drop addition amount is greater than or equal to 15wt%).

The invention provides a preparation method of a waterproof flame-retardant multifunctional fabric, and belongs to the technical field of functional textiles. The preparation method comprises the following steps: heating dihydric alcohol until the dihydric alcohol is completely melted, adding diisocyanate, a flame retardant and a catalyst, reacting to obtain a polyurethane prepolymer, adding a chain extender for chain extension, then adding an end-capping reagent for end capping, cooling, adding an emulsifier to obtain a waterproof flame retardant emulsion, adding water to form a finishing agent, soaking a polyacrylonitrile pre-oxidized fiber fabric in the finishing agent for treatment, and drying to obtain the waterproof flame retardant fabric. And pre-drying and baking to obtain the multifunctional fabric. Polyhydric alcohol with a long alkane chain is adopted to carry out chain extension on a polyurethane prepolymer, the obtained waterproof agent has good film-forming property, can be firmly fixed on the surface of a fiber without the help of a cross-linking agent or an adhesive during application, and endows a modified textile with excellent washing fastness.

The invention relates to the technical field of power cables, and provides a medium-voltage fireproof cable, which comprises a conductor, and an insulating layer, an armor layer and a sheath layer which are sequentially arranged outside the conductor, the insulating layer comprises the following components in parts by weight: 70-80 parts of polyethylene, 5-10 parts of a flame retardant, 3-5 parts of a cross-linking agent, 1-2 parts of a plasticizer and 1-3 parts of an antioxidant; the sheath layer comprises the following components in parts by weight: 100 parts of polyvinyl chloride, 8-16 parts of a flame retardant, 1-2 parts of a plasticizer, 1-3 parts of an antioxidant and 5-10 parts of filler; the filler comprises silicon dioxide, inorganic fibers and tetrapod-like zinc oxide whiskers. According to the technical scheme, the problem that the strength and the aging resistance of the cable in the prior art are poor is solved.

The invention discloses a fluoride-free environment-friendly flame-retardant PC (polycarbonate) material and a preparation method thereof. The fluoride-free environment-friendly flame-retardant PC material is prepared from the following raw materials in parts by weight: 68-99.98% of polycarbonate resin; 0.01 to 25% of a flame retardant; 0.01 to 5% of a synergistic flame retardant; and 0-2% of a processing aid. The flame retardant does not contain any flame retardant, does not generate toxic gas or smoke in the combustion process and is harmless to the environment and human bodies, the components of the flame-retardant PC material meet the PFAS environment-friendly requirement, the flame-retardant PC material belongs to an environment-friendly material, and the prepared fluoride-free environment-friendly flame-retardant PC material is applied to the fields of the automobile industry, the electric appliance and instrument industry, the mechanical industry and the like.

The invention discloses a multi-effect flame-retardant in-situ gel polymer electrolyte and application thereof. The electrolyte is a gel polymer electrolyte with a three-dimensional network structure prepared from a first flame retardant, a second flame retardant, a cross-linking agent, an initiator and a liquid electrolyte in situ, the first flame retardant is an acrylate liquid-phase monomer containing a phosphorus element, and the content of the first flame retardant accounts for 1-4wt% of the total mass of the electrolyte; the second flame retardant is an acrylate liquid-phase monomer containing a fluorine element, and the content of the second flame retardant accounts for 1-4wt% of the total mass of the electrolyte; the content of the cross-linking agent accounts for 1-2wt% of the total mass of the electrolyte; the content of the initiator accounts for 0.05-1wt% of the total mass of the electrolyte; and the balance is liquid electrolyte. According to the invention, the flame retardant is effectively constructed on a three-dimensional network skeleton, so that the flame-retardant effect of the gel polymer electrolyte is enhanced under the synergistic effect of phosphorus and fluorine while the electrochemical performance is not sacrificed.

The invention provides a long glass fiber reinforced flame-retardant ceramic polypropylene material and a preparation method thereof. Comprising the following components in parts by weight: 0-20 parts of polypropylene, 30-60 parts of flame-retardant long glass fiber master batch and 40-70 parts of ceramic master batch. According to the invention, the multi-gradient melting point glass powder, the phosphorus flame retardant, the tetrapod-like zinc oxide whisker, the long glass fiber and the ceramic forming filler are matched, so that a carbon layer can be kept compact in structure and high in structural strength during combustion, resists flame pressure and is not damaged; an interlayer structure blocks a heat conduction path, the back surface temperature is obviously reduced, and the material is prevented from softening and collapsing. The obvious effects of ablation resistance, good processing, high strength, good flame retardance, low cost and light weight are achieved.

The invention relates to the technical field of chlorinated polyvinyl chloride plastics, in particular to a PVC corrosion-resistant cable protection pipe and a preparation process thereof. The invention aims to solve the problem that the mechanical property and the corrosion resistance of the existing PVC cable protection pipe cannot be considered at the same time. Chlorinated polyvinyl chloride and polyvinyl chloride are subjected to hot mixing to obtain matrix resin, and the corrosion-resistant additive, the composite flame retardant, the flexibilizer and other additives are added to obtain the cable protection tube. The corrosion-resistant additive is obtained by grafting and modifying nano silicon dioxide with epoxy resin and premixing with an ethylene-vinyl alcohol copolymer; the composite flame retardant comprises core layers of nitrogen series, phosphorus series and inorganic hydroxides and a shell layer of an acrylate polymer, and is obtained through a core-shell reaction; the cable protection pipe is prepared through a multi-step mixing process; by introducing the core-shell structure and the corrosion-resistant auxiliary agent, efficient flame retardance and corrosion resistance are achieved, stress is buffered through the flexible shell layer, and the mechanical property of the material is maintained.

The invention relates to the technical field of power cables, in particular to a heat-aging-resistant crosslinked polyethylene insulated power cable and a preparation method thereof. The cable comprises conductor wire cores, an insulating layer, a filling layer, a composite function layer, a steel tape armoring layer and a sheath layer from inside to outside. The insulating layer is composed of semi-conductive crosslinked polyethylene, silicone resin, nano montmorillonite and an HALS light stabilizer; the filling layer is composed of plasticized glass fabric, polyphenylene sulfide and rare earth oxide; the composite functional layer sequentially comprises a heat-conducting inner layer, a flame-retardant middle layer and an anti-UV outer layer from inside to outside; the sheath layer is composed of polyolefin, white carbon black, ceramic silicone rubber, a flame retardant, polyethylene wax and an initiator. According to the cable, cross-linked polyethylene and silicone resin are preferably selected as heat-resistant materials, heat conduction / flame retardance / UV resistance / armored multi-layer synergistic protection is achieved, the mechanical barrier performance is improved, meanwhile, damage of thermal stress to internal materials is reduced, comprehensive improvement of thermal aging resistance is achieved, and the cable is suitable for high-temperature, high-humidity and frequent thermal cycle harsh environments.

The invention relates to the technical field of surface coating materials, in particular to a multifunctional surface coating which comprises the following raw materials: organic silicon modified acrylic resin, an intumescent flame retardant, hollow glass beads, nano titanium dioxide, an auxiliary agent, graphene, silver nanoparticles and flaky zinc powder. The intumescent flame retardant is formed by compounding melamine polyphosphate and pentaerythritol, and the auxiliary agent comprises a dispersing agent, a flatting agent and a plasticizer. By integrating multiple functions of fire prevention, water prevention, heat insulation, self-cleaning and the like into a whole, the complex requirements of different fields of buildings, industry, traffic and the like on material performance can be comprehensively met. In the application of building exterior walls, the fireproof safety, the waterproof sealing performance and the heat insulation performance of buildings can be effectively improved, and energy consumption is reduced; in the aspect of industrial equipment protection, equipment can be protected from being damaged by environmental factors such as high temperature, moisture and corrosion, and the service life of the equipment is prolonged.

The invention discloses a high-strength nano composite stiffening filling master batch and a preparation method thereof, and relates to the technical field of high polymer materials, the raw materials comprise a nano filler, a matrix material and a functional additive; the nano filler comprises nano diamond, nano silicon carbide and bio-based nano cellulose, the base material comprises polyimide, polyether-ether-ketone and bio-based polylactic acid, and the functional additive comprises a hindered phenol antioxidant, a nano aluminum hydroxide flame retardant, a nano silicon dioxide reinforcing agent, an ultraviolet light absorber, a carbon nano tube and nano silver particles. Nano-diamond, nano-silicon carbide and bio-based nano-cellulose are adopted as nano-fillers, polyimide, polyether-ether-ketone and bio-based polylactic acid are combined as base materials, and a plurality of functional additives are added, so that the preparation of the high-strength nano-composite stiffening filling master batch is realized; and the problems of poor dispersibility, mechanical property damage, insufficient hardness and poor interface bonding of the traditional filler master batch can be solved.

The invention discloses a polycarbonate material as well as a preparation method and application thereof, and belongs to the technical field of high polymer materials, and the polycarbonate material is prepared from the following raw materials in parts by weight: 40-80 parts of polycarbonate, 20-60 parts of silicon copolymerized polycarbonate, 0.1-0.5 part of a sulfonate flame retardant, 0.1-0.5 part of a compound flame retardant, 0.3-0.8 part of an anti-dripping agent, 0.1-0.4 part of an antioxidant and 0.2-0.8 part of a lubricant. The compound flame retardant is an organic silicon flame retardant with free radicals of nitrogen and oxygen in structure. The material still has better impact resistance in a low-temperature environment of minus 40 DEG C; the compound flame retardant not only has an efficient flame retardant effect, but also has excellent weather resistance; under the action of a sulfonate flame retardant and a compound flame retardant, the flame retardant can meet the flame retardant requirement of 0.5-0.8 mm ultrathin parts, and is especially suitable for the field of electronic and electrical appliances such as middle-and-high-end notebook computers, electronic book shells and the like.

The invention discloses a high dimensional stability glass fiber reinforced halogen-free flame retardant PBT / PC alloy material, and relates to the technical field of PBT / PC alloy preparation, the raw materials comprise the following components by mass: 35-60 parts of PBT, 30-40 parts of PC, 2-10 parts of a modified heat resistant agent, 1-15 parts of an antioxidant, 0.1-6 parts of a heat stabilizer, 0.2-3 parts of a lubricant, 0.2-3 parts of a halogen-free flame retardant, 2-6 parts of mica, and 5-40 parts of glass fiber. The glass fiber reinforced PBT / PC alloy material is processed and prepared according to a set proportion and a set preparation sequence, the PBT / PC material with high dimensional stability is finally obtained, diisocyanate, hydroxyalkyl terminated polydimethylsiloxane and a hexaalkoxy silane coupling agent are compounded according to a certain proportion to prepare a modified heat-resistant agent, and the modified heat-resistant agent is added into the glass fiber reinforced PBT / PC alloy material to prepare the glass fiber reinforced PBT / PC alloy material. According to the PBT / PC alloy material disclosed by the invention, the overall heat resistance of the PBT / PC alloy material is improved while the interfacial compatibility among different materials is improved, and the prepared PBT / PC alloy material has better dimensional stability at different temperatures due to the proportion of PBT and PC and is not easy to change in size.

The invention relates to the field of epoxy molding compounds, and discloses an epoxy molding compound as well as a preparation method and application thereof. The epoxy molding compound contains a heat-conducting filler, epoxy resin, a curing agent, a curing accelerator, a coupling agent, a bonding modifier, a flame retardant, a coloring agent, a release agent, hydroxyl-terminated silicone oil and a dispersing wetting agent. The heat-conducting filler contains aluminum oxide, crystalline silicon dioxide powder and molten spherical silicon dioxide powder; the bonding modifier is a triazole compound or a gallic acid compound; the weight ratio of the hydroxyl-terminated silicone oil to the heat-conducting filler to the bonding modifier is (1.5-4): (700-800): 1. The epoxy molding compound has the advantages of favorable molding process property, excellent heat-conducting property and high adhesive strength, and is suitable for being used as a packaging material of a fully-packaged power module.

The invention relates to the field of high polymer materials, in particular to a burnthrough-resistant PC composite material and a preparation method thereof. According to the burnthrough-resistant PC composite material provided by the invention, the bromine flame retardant, the silicon flame retardant and the boron flame retardant are used as one of the components, during combustion, bromine is used for absorbing free radicals, so that the oxidation reaction is slow, heat is reduced, silicon and boron are crosslinked to form a B-Si vitrification protection layer, heat insulation and oxygen insulation are realized, the compactness of a carbon layer is complemented, a sinking carbon layer is formed, and matrix resin is prevented from being combusted; the melt strength of the PC composite material is synergistically improved, burnthrough is prevented, and the PC composite material has excellent burnthrough resistance and meets the requirements of new national standards. The invention further provides a preparation method of the burnthrough-resistant PC composite material, the method is simple in process and high in product benefit, and the technical problem of how to improve the burnthrough resistance of the PC composite material is efficiently solved.

The invention relates to the technical field of cables, and provides a corrosion-resistant overhead cable which sequentially comprises a conductor, an insulating layer, a shielding layer, a lining layer and an outer sheath layer from inside to outside. The outer sheath layer comprises the following raw materials in parts by weight: 60-70 parts of polyethylene, 20-30 parts of an ethylene-vinyl acetate copolymer, 10-15 parts of polyphenylene sulfide, 25-35 parts of a flame retardant, 0.5-1 part of an antioxidant, 2-3 parts of a lubricant, 3-5 parts of a compatilizer and 15-25 parts of a rectorite / tungsten carbide composite material; the mass ratio of rectorite to tungsten carbide is (1: 9)-(9: 1). According to the technical scheme, the problem of poor corrosion resistance of the overhead cable in the prior art is solved.