1602 results about "Magnesium Hydrate" patented technology

Highly flame-retardant, heat-insulating and environmentally friendly cable with a copper core, wherein an insulating sheath (2) is permanently provided on the outside of the copper core (1), and a protective layer (3) is permanently provided on the outside of the insulating sheath (2), wherein four cavities (4) are arranged in the protective layer (3) in a uniform circular arrangement, wherein each of the four cavities (4) is filled with a flame retardant consisting of magnesium hydroxide powder, wherein a reinforcing layer (5) is permanently provided on the outside of the protective layer (3), and a hardening layer (6) is permanently provided on the outside of the reinforcing layer (5), wherein a thermal insulation layer (7) is permanently provided on the outside of the hardening layer (6), and wherein four protective units are provided on the outside of the copper core (1) in a uniform circular arrangement.

The invention relates to the field of cable materials, and provides a flexible flame-retardant polyolefin insulating material for a high-flexibility drag chain cable and a preparation method thereof.The flexible flame-retardant polyolefin insulating material comprises phosphorus-containing flame retardant surface modified boron nitride, polyphosphazene modified magnesium hydroxide nanowires, polyolefin matrix resin and the like. The phosphorus-containing flame retardant surface modified boron nitride is prepared by carrying out surface modification on hydroxyl modified hexagonal boron nitride through 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide and vinyl trimethoxy silane, and shows excellent flame retardant property and flexibility. The polyphosphazene modified magnesium hydroxide nanowire is prepared through silane coupling agent functionalization and polyphosphazene cross-linking polymerization, and has flame retardance and a reinforcing effect. The preparation method of the material comprises the steps of raw material premixing, melt blending, cooling granulation and extrusion molding. The material has the characteristics of flame retardance, high flexibility and the like, and is widely applied to dynamic high-flexibility cables in the fields of industrial automation equipment, robots, machine tool manufacturing, logistics conveying systems and the like.

Disclosed in the present invention are an ultralow-smoke-density cold-resistant halogen-free flame-retardant cable material and a preparation method therefor. The cable material is prepared from the following raw materials in parts by mass: 50 parts of a base resin, 45-80 parts of an inorganic flame retardant, 1-3 parts of a lubricant, 2-4 parts of a reactive smoke suppressant, 0.2-0.5 part of an antioxidant, 2-5 parts of zinc borate and 1-2 parts of a coupling agent, the base resin comprising an ethylene-vinyl acetate copolymer, a maleic anhydride grafted polymer and a metallocene linear polyethylene resin in a mass ratio of (25-35):(5-10):(10-20), and the inorganic flame retardant being a mixture of modified aluminum-magnesium hydrotalcite and modified magnesium hydroxide. The inorganic flame retardant used in the present invention has dual effects of flame retardance and smoke elimination, so that in cooperation with the reactive smoke suppressant, the cable material can reach an ultralow smoke density during combustion. In addition, none of the base resin, the inorganic flame retardant and the reactive smoke suppressant contains a halogen component, so that no halogen gas will be generated during combustion. The base resin has a reasonable proportion, so that the cable material can tolerate a low temperature of -40℃.

The invention relates to the technical field of cables, and provides a fireproof flame-retardant 10kV power cable and a preparation method thereof. The fire-resistant flame-retardant 10kV power cable comprises a conductor and a fire-resistant flame-retardant layer, the fireproof flame-retardant layer is prepared from the following raw materials in parts by weight: 35 to 45 parts of linear low-density polyethylene, 40 to 50 parts of ethylene-vinyl acetate copolymer, 25 to 30 parts of modified aluminum hydroxide, 5 to 8 parts of polyethylene grafted maleic anhydride, 10 to 12 parts of phosphate modified halloysite nanotube, 5 to 8 parts of ZIF-8 loaded zinc borate core-shell particles, 15 to 20 parts of magnesium hydroxide and 2 to 3 parts of silane coupling agent. 0.5 to 1 part of antioxidant, 0.5 to 1 part of calcium stearate and 1 to 1.5 parts of polyethylene wax. According to the cable prepared in the invention, the situation that a conductor is exposed and the fire resistance is lost due to cracking and falling under long-time high-temperature baking is avoided; the continuous effectiveness of the flame retardant at high temperature is improved.

The invention provides a tear-resistant, wear-resistant, low-smoke and non-dripping sheath material as well as a preparation method and application thereof. The tear-resistant wear-resistant low-smoke non-dripping sheath material is prepared from the following components in parts by weight: 25 to 35 parts of metallocene linear low-density polyethylene, 10 to 15 parts of ethylene-vinyl acetate copolymer, 6 to 8 parts of compatilizer, 50 to 60 parts of aluminum hydroxide, 10 to 15 parts of magnesium hydroxide, 3 to 4 parts of microencapsulated red phosphorus, 5 to 8 parts of lithium oxide synergist, 4 to 6 parts of silicone master batch, 0.3 to 0.7 part of carbon black master batch and 1.5 to 2.5 parts of coupling agent. The tear-resistant wear-resistant low-smoke non-dripping sheath material provided by the invention has the characteristics of being halogen-free, flame-retardant, tear-resistant and wear-resistant, and a low-smoke halogen-free flame-retardant power cable prepared from the sheath material has the characteristics of high smoke light transmittance during combustion, no dripping and cracking resistance.

The invention discloses a high-cold-resistance environment-friendly PVC decorative material and application thereof, belongs to the technical field of PVC preparation, and is used for solving the technical problem that the low temperature resistance and the environmental protection property of a PVC material in the prior art need to be further improved. The high-cold-resistance environment-friendly PVC decorative material specifically comprises the following raw materials in parts by weight: 80-100 parts of composite PVC, 8-10 parts of a bio-based plasticizer and 6-10 parts of an auxiliary additive; the preparation method comprises the following steps: modifying montmorillonite by using a silane coupling agent, loading magnesium hydroxide to prepare a composite filler, carrying out ring-opening polymerization, amine end capping and oxidation on cyclotrisiloxane to generate a low-temperature-resistant agent containing an epoxy group, introducing trimethoxysilane into PVC through sulfydryl substitution, carrying out hydrolytic condensation to form a Si-O-Si cross-linked network, and covalently binding the Si-O-Si cross-linked network with the filler and the low-temperature-resistant agent to obtain the low-temperature-resistant PVC composite material. And reacting the epoxidized soybean oil with glycine, and carrying out calcium coordination to generate a bio-based plasticizer, thereby finally preparing the PVC decorative material.

The invention relates to a magnesia-carbon refractory material with high thermal shock resistance and erosion resistance and a preparation method thereof. The magnesia-carbon refractory material with high thermal shock resistance and erosion resistance is prepared from fused magnesia aggregate, fused magnesia fine powder, silicon powder, crystalline flake graphite, Al2O3-MgO-CaO core-shell structure raw materials and phenolic resin. The Al2O3-MgO-CaO core-shell structure raw materials are prepared by the following steps: uniformly mixing calcium carbonate, magnesium hydroxide and alumina micro powder by adopting a planetary ball mill, and then carrying out granulation treatment by adopting a disc granulator by taking polyvinyl alcohol as a binding agent, so as to obtain core particles; and mixing the inner core particles and the alumina micro powder by taking alumina sol as a binding agent, and further sintering to obtain the core-shell structure raw material. The Al2O3-MgO-CaO core-shell structure raw material is utilized to improve the comprehensive performance of the magnesia-carbon refractory material, and the prepared magnesia-carbon refractory material has excellent thermal shock resistance and slag corrosion resistance and can meet the requirements of the current steel industry for the magnesia-carbon refractory material.

The invention relates to the technical field of cable coating materials, and particularly discloses a B1-grade cable material as well as a preparation method and application thereof. The cable material provided by the invention comprises matrix resin, a compatilizer, a flame retardant, a lubricant, an antioxidant, a smoke suppression charring agent, nano silicon dioxide and a silane coupling agent, the matrix resin is a mixture of linear low density polyethylene resin, an ethylene-octylene copolymer, metallocene polyethylene and an ethylene-vinyl acetate copolymer; the flame retardant is a mixture of magnesium hydroxide, aluminum hydroxide and hydrotalcite; the smoke suppression charring agent is a mixture of hydrous magnesium silicate and modified montmorillonite; the silane coupling agent is a mixture of vinyl silane and diamino silane. According to the cable material provided by the invention, the specific matrix resin, the flame retardant, the smoke suppression charring agent and the silane coupling agent are combined with auxiliaries such as the compatilizer, the lubricant, the antioxidant and the nano silicon dioxide to serve as raw materials, so that the flame-retardant effect of the B1-grade cable material is greatly improved.

The invention relates to a modified chrome corundum ramming material and a preparation and construction process thereof, and belongs to the technical field of chrome corundum ramming materials. The ramming material comprises a material A, a material B and a material C, wherein the material A comprises chrome corundum aggregate, titanium dioxide coated aluminum oxide microspheres, calcium sulfide dehydrate and silicon carbide porous microspheres; the material B comprises chromium oxide-zirconium oxide composite nano powder, sodium thiosulfate pentahydrate, tricalcium phosphate and hexagonal boron nitride flaky crystals; and the material C comprises an aluminum dihydrogen phosphate-magnesium hydroxide compound, a calcium fluoride-aluminum oxide co-melt and a silane coupling agent. The preparation process comprises the steps of pretreatment of all the components, preparation of composite powder and layered preparation. The construction process comprises the steps of pretreatment, wet-process mixing, layered ramming, negative-pressure permeation, medium-temperature reaction, spraying curing, integral firing and the like. Generation of hexavalent chromium can be effectively inhibited, the thermal shock resistance, the mechanical strength and the heat-conducting property of the material are remarkably improved, and the material has the advantages of being good in environment friendliness, long in service life, excellent in construction performance and the like.

The invention belongs to the technical field of synthesis of magnesium hydroxide flame retardants, and provides a synthesis method and flame-retardant application of hexagonal flaky magnesium hydroxide, and the synthesis method comprises the following steps: step 1, dissolving a mineralizer, a crystal form control agent and magnesium chloride in water in proportion; step 2, putting a certain amount of the mixed solution into a high-pressure reaction kettle for hydrothermal reaction; step 3, after the reaction is finished, taking out the cooled solution from the high-pressure reaction kettle, and filtering and separating out a white product; 4, drying the sample, and grinding to obtain pure magnesium hydroxide powder; through reasonable process design and optimization, the prepared magnesium hydroxide not only has regular morphology and better dispersity, but also has excellent performance in the field of flame retardance of high polymer materials, meets the requirement of environmental protection, has the production advantages of low cost and high efficiency, and is suitable for industrial production. The method not only can effectively improve the overall utilization rate of salt lake resources, but also has remarkable economic and application values, and has wide industrial application prospects.

The invention belongs to the technical field of fireproof materials, and particularly relates to a non-intumescent fireproof coating for a fiber reinforced composite material as well as a preparation method and application of the non-intumescent fireproof coating. A binder in preparation raw materials of the non-intumescent fire retardant coating comprises metakaolin, fly ash, CA80 high-alumina cement and an exciting agent, or comprises metakaolin, fly ash, CA80 high-alumina cement, an exciting agent and an organic matter binder, the organic matter binder comprises redispersible latex powder and / or polyvinyl alcohol powder, and the organic matter binder comprises silica powder and / or silica powder. The heat insulation filler comprises expanded vermiculite, hydrophobic modified expanded perlite, sepiolite and hollow glass beads, the flame retardant comprises aluminum hydroxide and magnesium hydroxide, the fibers comprise glass fibers, and the auxiliaries comprise a foaming agent, a thickening agent, a foam stabilizer and an acrylic emulsion. The formed coating has the advantages of low carbon, low cost, excellent heat insulation performance and high-temperature strength, can be applied as a fire retardant coating of a fiber reinforced plastic (FRP), and can effectively protect an FRP reinforcing system.

The invention discloses a high-specific-surface-area high-nitrogen-oxygen-doped lignin porous carbon material as well as a preparation method and application thereof. The method comprises the following steps: firstly, preparing a supramolecular compound from lignin, magnesium hydroxide, cyanuric acid and melamine through solvothermal reaction, then directly carbonizing to obtain a nitrogen-doped lignin carbon / magnesium oxide compound, and activating the nitrogen-doped lignin carbon / magnesium oxide compound by using weakly corrosive sylvite to increase a micro-mesoporous structure. Therefore, the nitrogen and oxygen doped lignin porous carbon material with ultrahigh specific surface area and rich micro-mesopores is prepared. According to the obtained lignin porous carbon material with the high specific surface area and high nitrogen and oxygen doping, a large number of active sites can be provided due to the high specific surface area, wettability of the carbon material can be improved due to high nitrogen and oxygen doping, the utilization rate of the active sites is increased, and the problem that the pore diameter of the carbon material is not matched with a current carrier is solved due to the rich micro-mesoporous structure; and the specific capacitance of the zinc ion hybrid capacitor is obviously improved.

The invention discloses a silane cross-linked polyolefin halogen-free flame-retardant cable material and a low-energy-consumption preparation method thereof.The preparation method comprises the steps that EVA / EEA serves as a matrix, silane groups are covalently connected to a polyolefin molecular chain through a free radical grafting reaction, and a grafting material containing an active silane side group is prepared; meanwhile, vinyl isocyanate is adopted to chemically modify hydroxyl on the surface of magnesium hydroxide, vinyl is grafted to the surfaces of particles, the polarity of the particles is reduced, and the dispersity of the particles is enhanced; then carrying out melt blending on the grafted material and modified magnesium hydroxide, constructing an interface bridge by using an anhydride group, and shortening the two-phase distance; finally, through room-temperature natural cross-linking and warm water auxiliary cross-linking, silane groups are promoted to be hydrolyzed into silanol, the silanol is condensed to form a-Si-O-Si-three-dimensional network, meanwhile, vinyl on the surface of magnesium hydroxide and a polyolefin matrix are subjected to free radical copolymerization, and a covalent bond interface layer is formed between inorganic particles and an organic matrix. According to the method, the synergistic improvement of high crosslinking degree, strong stretchability and excellent flame retardance of the cable material is realized through molecular-level interface regulation and cross-linking network optimization.

The invention relates to the technical field of silicone rubber preparation, in particular to high-flame-retardant insulating liquid silicone rubber and a preparation method and application thereof. The high-flame-retardant insulating liquid silicone rubber is prepared from the following raw materials in parts by mass: 60 to 75 parts of vinyl-terminated polydimethylsiloxane, 5 to 8 parts of methylhydrosiloxane, 20 to 24 parts of a flame retardant, 0.1 to 0.2 part of a platinum catalyst, 25 to 30 parts of modified silicon dioxide and 2 to 3 parts of a silane coupling agent, and the flame retardant is prepared by mixing decabromodiphenyl ethane and modified magnesium hydroxide. The high-flame-retardant insulating liquid silicone rubber not only has excellent flame retardance, insulativity, high-temperature-resistant stability and the like, but also has remarkable advantages in mechanical properties and environmental adaptability, and provides safer and more reliable material choices for related fields.

The invention belongs to the technical field of new materials of conveying belts, and discloses a graphene modified whole-core flame-retardant conveying belt for a coal mine and a preparation method of the graphene modified whole-core flame-retardant conveying belt. Comprising mixed rubber and a polyester fabric located in mixed liquid, and the mixed rubber is prepared from, by weight, 100-120 parts of chloroprene rubber, 20-30 parts of hydrogenated nitrile rubber, 5-10 parts of graphene composite particles, 1-3 parts of magnesium hydroxide and 1-3 parts of dioctyl terephthalate. The conveyor belt prepared by the invention not only has relatively high mechanical strength and tear resistance, but also has good flame retardant property.

The invention relates to the technical field of heat insulation pads for battery cells, in particular to a novel battery cell large-area buffer heat insulation pad and a preparation method thereof.The novel battery cell large-area buffer heat insulation pad is prepared by using surface modified boron nitride nanosheets (BNSS) as nanofiller, silica-coated magnesium hydroxide (MH-coated SiO2) of a core-shell structure as a flame retardant and polysilsesquioxane (POSS) as a high-temperature-resistant auxiliary. A ternary flame-retardant system is formed in the organic foamed silicone rubber layer through the nano filler, the flame retardant and the high-temperature-resistant additive, so that the flame-retardant property of the organic foamed silicone rubber material serving as a battery cell heat insulation pad is improved, thermal runaway propagation can be delayed, the requirements of light weight (the density is 0.3-0.6 g / cm < 3 >) and high mechanical strength are met, the manufacturing cost is reduced, the mass production cost is only increased by 15%, and the product quality is improved. However, the premium price space of the product can reach 50%, and the requirement of a high-end power battery is met.

The invention discloses a plastic fireproof material for extrusion. The invention belongs to the technical field of plastic particles capable of reaching the fireproof grade A (non-combustible grade), magnesium hydroxide, aluminum hydroxide and other additives are reasonably added into the PE plastic particles, the fireproof grade A non-combustible grade standard is successfully reached, compared with existing plastic particles only capable of reaching the fireproof grade B, the fireproof safety is remarkably improved, and the service life of the plastic particles is prolonged. The cable can be widely applied to places with strict fireproof requirements, and the fire risk is effectively reduced; the raw materials are subjected to constant-temperature drying treatment in the pretreatment process, so that the raw materials flow and fill a mold more easily in the injection molding process, the production efficiency is improved, the quality and performance of a final product can be ensured, the defects of yellowing, silver wires, bubbles, shrinkage cavities and the like of the product are avoided, and the yield of the product is improved.

The invention relates to the field of flame retardants, in particular to a wet modified magnesium hydroxide flame retardant and a preparation method thereof. The preparation method comprises the following steps: step 1, preparing aminated magnesium hydroxide particles; step 2, preparing amino sulfonamide magnesium hydroxide particles; and step 3, preparing the modified magnesium hydroxide flame retardant. Compared with a traditional magnesium hydroxide flame retardant, the use amount of the composite flame retardant in a flame-retardant material can be reduced by 10%, but even if the use amount is reduced, the composite flame retardant still can show good flame retardance, and the mechanical property and the heat and humidity resistance of a resin material can be obviously improved.

The invention relates to the technical field of cables, and provides a high-temperature-resistant flame-retardant power cable and a preparation method thereof. A high-temperature-resistant flame-retardant power cable comprises a conductor and a high-temperature-resistant flame-retardant outer layer wrapping the conductor. The high-temperature-resistant flame-retardant outer layer is prepared from the following raw materials in parts by weight: linear low-density polyethylene, an ethylene-vinyl acetate copolymer, ethylene propylene diene monomer, chopped polyimide fibers, nano-coated magnesium hydroxide, zinc borate, zinc stannate, polyethylene grafted maleic anhydride, an anti-aging agent, dicumyl peroxide, an antioxidant, polyethylene wax, calcium stearate and cerium dioxide. According to the cable prepared in the invention, the reliability of an existing high-temperature-resistant flame-retardant power cable under thermal cycle is improved, and the problem of local temperature resistance difference caused by agglomeration and high-temperature migration of nanoparticles in a polymer matrix is improved.

The invention discloses a preparation method of modified self-extinguishing insulating oil with flame-retardant and self-repairing functions. Wherein the insulating liquid is mixed oil of mineral oil and palm oil-based modified natural ester, and the inherent high flash point characteristic of the natural ester improves the fireproof safety of the insulating oil. The modified hexagonal boron nitride (h-BN), the magnesium hydroxide nano material and the microcapsule repairing agent are added into the insulating oil, and the h-BN can capture free electrons in the oil, so that the formation and expansion of electric arcs are inhibited, and the breakdown voltage is improved. Magnesium hydroxide is heated to decompose and absorb heat, the fault temperature is reduced, and therefore the arc self-extinguishing effect is achieved. Under the action of a high electric field and a high temperature, the capsule wall of the microcapsule repairing agent is broken, meanwhile, the repairing material is released, a chemical reaction is carried out, and the insulating property of the insulating oil is repaired. The modified insulating oil prepared by the invention has high insulating strength and high flame retardance, and also has a performance self-repairing function, so that the service life of the insulating oil is prolonged.

The invention relates to the technical field of high polymer materials, and provides an anti-aging cable and a preparation method thereof. The anti-aging cable comprises a conductor and a sheath layer, the sheath layer is prepared from the following raw materials in parts by weight: 40 to 60 parts of ethylene propylene diene monomer, 20 to 30 parts of ethylene-vinyl acetate copolymer, 20 to 22 parts of nano cellulose / montmorillonite composite material, 5 to 10 parts of nano silicon dioxide, 10 to 20 parts of magnesium hydroxide, 5 to 8 parts of zinc borate, 1.5 to 3 parts of composite antioxidant, 0.5 to 1.5 parts of ultraviolet light absorber, 1 to 1.2 parts of anti-aging agent and 1 to 2 parts of silane coupling agent. And 0.3 to 0.5 part of maleic anhydride grafted polypropylene. According to the anti-aging cable prepared in the invention, the high temperature resistance and the acid corrosion resistance of the anti-aging cable are improved, and the aging of the cable is effectively delayed.

The invention relates to the technical field of high polymer materials, in particular to a resin composite material with flame-retardant and insulating properties and a preparation method thereof. The problems that in the prior art, a resin composite material is poor in flame retardance and insufficient in insulating property are solved. The preparation method comprises the following steps: modifying epoxy resin with maleic anhydride and carboxyl modified nitrile rubber to obtain modified epoxy resin; a modified flame-retardant system is obtained by processing the carbon nanotube loaded melamine polyphosphate, the triphenyl phosphate and the magnesium hydroxide; the preparation method comprises the following steps: mixing modified epoxy resin and a modified flame-retardant system, adding modified nano silicon dioxide through a supercritical fluid technology and ultrasonic dispersion, and performing staged curing through a curing agent to obtain a resin composite material; the flame retardant property of the composite material is improved through the synergistic effect of the flame retardant and loading of the carbon nanotubes; and through the synergistic effect of the modified nano silicon dioxide and the carbon nanotubes, the insulating property of the composite material is improved.

The invention relates to the technical field of composite layer structures, in particular to flame-retardant fiber fireproof heat-preservation knitted composite cotton and a preparation process thereof.The knitted composite cotton comprises a knitted cotton base body layer, fiber layers are fixedly arranged on the upper surface and the lower surface of the knitted cotton base body layer, and the two fiber layers are formed by weaving polyester fibers and spandex fibers; resin layers are fixedly arranged on the outer surfaces of the two fiber layers, and are formed by mould pressing and curing of a resin complexing agent. The knitted composite cotton is formed by compounding a knitted cotton matrix layer, an upper fiber layer, a lower fiber layer, an upper resin layer and a lower resin layer, and a resin body in a resin complexing agent is prepared from bisphenol A epoxy resin, a dicyandiamide curing agent, 1-benzyl-2-methylimidazole and a silane coupling agent KH560 to form matrix liquid. The added glass beads and the magnesium hydroxide flame retardant are used as functional aids, and the modified glass fibers and the reinforcing agent are coordinated and synergic, so that the obtained knitted composite cotton has excellent heat preservation, flame retardance and fire resistance.

The invention belongs to the technical field of insulating flame-retardant adhesive tapes, and particularly relates to an insulating flame-retardant adhesive tape and a preparation method thereof. According to the invention, phytic acid reacts with 3-amino-5-methylpyrazole, triaminopyrimidine and polyether amine-2000 to prepare a flame-retardant auxiliary agent, and the flame-retardant auxiliary agent is compounded with magnesium hydroxide, zinc borate and melamine to prepare a modified flame retardant which can generate an expansive carbon layer during combustion to block heat and isolate oxygen so as to achieve a flame-retardant effect; an aluminum oxide layer generated on the artificial diamond micro-powder is used as an insulating heat-conducting aid, so that the insulativity, wear resistance and corrosion resistance of the insulating flame-retardant adhesive tape are improved, the adhesive tape can be assisted in uniform heat conduction, and combustion caused by over-high local temperature is prevented; epoxy resin is used for wrapping the uniformly dispersed insulating heat-conducting auxiliary agent, and anisyl and boron nitride ceramic powder are cured to prepare an insulating material, so that the dielectric breakdown performance of the adhesive tape is enhanced. The insulating flame-retardant adhesive tape prepared by the invention is excellent in insulativity and flame retardance and free of halogen flame retardants, and the production process is environment-friendly.

The invention discloses a polyurethane protective adhesive tape for aviation and a preparation method thereof, and relates to the technical field of adhesives. When the polyurethane protective adhesive tape for aviation is prepared, polyester glycol, an ultraviolet absorption monomer, 3-(4-pyridyl) pentane-1, 5-diol, 1, 4-butanediol and isophorone diisocyanate are polymerized to prepare polyurethane; the preparation method comprises the following steps: carrying out a reaction on polyurethane and 2-bromoethyl acrylate to prepare modified polyurethane; enabling the pretreated magnesium hydroxide to react with 3-epoxypropoxy-1, 1, 3, 3-tetramethyldisiloxane and ammonia water in sequence, so as to obtain modified magnesium hydroxide; the modified polyurethane and the modified magnesium hydroxide are mixed and then subjected to compression molding to prepare a polyurethane film; and coating a polyurethane film with the polyacrylate glue solution, and drying to obtain the polyurethane protective adhesive tape for aviation. The polyurethane protective adhesive tape for aviation prepared by the invention has excellent flame-retardant, anti-aging, antibacterial and self-repairing properties.

The invention relates to the technical field of cables, and provides a high-strength mining cable. Comprising a wire core and a sheath layer wrapping the surface of the wire core. The sheath layer is prepared from the following raw materials in parts by weight: 75 to 85 parts of polyvinyl chloride resin, 25 to 35 parts of chloroprene rubber, 20 to 30 parts of ethylene-vinyl acetate copolymer, 26 to 28 parts of core-shell SiO2 (at) BN composite material, 14 to 16 parts of silane coupling agent modified calcium carbonate, 8 to 10 parts of carbon black, 4 to 6 parts of magnesium oxide, 10 to 15 parts of aluminum hydroxide, 5 to 7 parts of magnesium hydroxide, 0.5 to 1.5 parts of antioxidant, 0.8 to 1.2 parts of vulcanizing agent and 0.7 to 0.9 part of auxiliary vulcanizing agent. According to the high-strength mining cable prepared in the invention, the wear resistance and acid and alkali resistance of the mining cable are enhanced, and the mining cable has certain fireproof and flame-retardant properties.

The invention discloses a coating type high-molecular flame-retardant material. The composite material is prepared from the following components: organic silicon modified epoxy resin, a bio-based castor oil derivative, hydroxyapatite, carbon nanofibers, expanded graphite, ammonium polyphosphate, zinc borate, nano silicon dioxide, molybdenum oxide, microencapsulated red phosphorus, magnesium hydroxide, melamine cyanurate, aluminum diethylphosphinate, pentaerythritol, trihydroxymethyl phosphine oxide and a silane coupling agent. The coating is prepared from a titanate coupling agent, stearic acid, polyethylene glycol, 2, 6-butylated hydroxytoluene, triphenyl phosphite, 2, 4-dihydroxybenzophenone, sebacic diester, polytetrafluoroethylene micro powder, a modified polydimethylsiloxane flatting agent, organic montmorillonite, a polyether modified silicon defoaming agent and a solvent. The invention has the beneficial effects of high flame retardant efficiency, environmental friendliness, excellent comprehensive performance and excellent processability.

The invention discloses a high-temperature-resistant flame-retardant nylon composite material and a preparation method thereof, and belongs to the technical field of high polymer materials. The preparation method comprises the following steps: uniformly mixing 100-110 parts of nylon resin, 40-60 parts of a flame retardant, 1-3 parts of a lubricant, 0.5-2 parts of an antioxidant and 0.5-2 parts of an ultraviolet light absorber, adding the mixture into a double-screw extruder from a main feed, adding the flame retardant into the double-screw extruder from a side feed, and performing extrusion, bracing, cooling, pelletizing and drying to obtain the high-temperature-resistant flame-retardant nylon composite material. The flame retardant disclosed by the invention contains high-dispersity magnesium hydroxide and halogen-free flame-retardant elements, namely nitrogen, phosphorus and silicon, and does not contain any halogen, so that the flame retardant disclosed by the invention has the flame-retardant effects of high flame retardance, low smoke generation amount and low harmfulness, and the application field of a nylon composite material can be effectively widened.

The invention provides a concrete composite expanding agent and a preparation method thereof, and belongs to the field of concrete admixtures. The concrete composite expanding agent comprises modified phosphogypsum, fly ash, bauxite, a modified oxide and an auxiliary agent, and is obtained by uniformly mixing the modified phosphogypsum, the fly ash, the bauxite, the modified oxide and the auxiliary agent which have different specific surface areas. According to the composite expanding agent, the modified ardealite and the fly ash synergistically provide an early-stage expansion source, early-stage shrinkage of concrete is compensated through calcium sulphoaluminate hydration products, meanwhile, modified magnesium oxide serves as a later-stage expansion source, magnesium hydroxide is generated through slow hydration, and long-term expansion compensation is achieved; the device has the advantages of good strength, compensation capability and the like; a large amount of industrial waste residues such as ardealite and fly ash are utilized, high-added-value utilization of the industrial waste residues is achieved, and remarkable economic benefits are achieved.

The invention provides a preparation method and application of magnesium L-threonate, and belongs to the technical field of medicines. The preparation method comprises the following steps: dissolving L-ascorbic acid in water, adding magnesium hydroxide and alkaline magnesium carbonate, stirring, dropwise adding hydrogen peroxide, heating, stirring and reacting, filtering a product, purifying and concentrating by temperature-sensitive molecularly imprinted hydrogel while the product is hot, adding an ethanol water solution into a concentrated solution, standing, crystallizing, filtering, washing and drying to obtain the magnesium L-threonate. And cooling the temperature-sensitive molecularly imprinted hydrogel after adsorption to room temperature, washing and repeatedly using the temperature-sensitive molecularly imprinted hydrogel. The magnesium L-threonate is simple in preparation method, high in purity and high in yield, meanwhile, the slow-release magnesium L-threonate is prepared, and the magnesium L-threonate is low in toxicity, good in biocompatibility, large in drug loading capacity, low in economic cost and good in drug effect and has wide application prospects in preparation of anti-depression drugs.