822 results about "Hexagonal boron nitride" patented technology

The invention provides a preparation method of an h-BN / PI high-temperature-resistant anticorrosive coating, and relates to the technical field of polymer composites.The preparation method of the h-BN / PI high-temperature-resistant anticorrosive coating comprises the steps that under the protection of inert atmosphere, aromatic diamine containing impurity element five-membered rings and aromatic dianhydride containing ether bonds are taken and subjected to a polymerization reaction in a polar aprotic solvent, and the h-BN / PI high-temperature-resistant anticorrosive coating is obtained. A polyamide acid solution is obtained; performing ultrasonic-assisted liquid phase stripping on the micron-sized hexagonal boron nitride to obtain single-layer hexagonal boron nitride; adding the single-layer hexagonal boron nitride into the polyamide acid solution for multiple times, and uniformly stirring to obtain a hexagonal boron nitride / polyimide composite solution; and coating the hexagonal boron nitride / polyimide composite liquid on a to-be-coated surface, and carrying out gradient heating curing to obtain the h-BN / PI high-temperature-resistant anticorrosive coating. The h-BN / PI high-temperature-resistant anticorrosive coating based on interaction of multiple hydrogen bonds has relatively good high temperature resistance, relatively good resistance mechanical property and excellent corrosion resistance.

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 discloses an uvioresistant acrylic resin coating and a preparation method thereof, and belongs to the technical field of acrylic resin paints.The uvioresistant acrylic resin coating is characterized in that step-by-step functional design is adopted, a functional polyurethane prepolymer is constructed through prepolymerization reaction and double-bond end capping, fluorosilicone modified acrylate emulsion is prepared through a core-shell emulsion polymerization process, and the uvioresistant acrylic resin coating is obtained. Then carrying out surface silane modification on hexagonal boron nitride and carrying out composite coating to obtain a modified boron nitride auxiliary agent; and finally, carrying out composite emulsification and dispersion compounding on all the components to obtain the anti-ultraviolet acrylic resin coating. Through the synergistic enhancement effect of the fluorosilicone modified core-shell structure and the surface modified boron nitride, the ultraviolet aging resistance and the insulation reliability of the coating are remarkably improved on the basis of keeping high adhesive force, excellent flexibility and impact resistance of the coating; the problems that a traditional acrylic coating is prone to yellowing and pulverization under long-term ultraviolet radiation, and the mechanical property is reduced are effectively solved, and the acrylic coating is suitable for the field of electronic equipment protective coatings with high requirements for weather resistance, mechanical strength and electrical insulating property.

The invention provides a preparation method of a barrier type antimonide infrared detector. The preparation method comprises the following steps: selecting a gallium antimonide substrate; a gallium antimonide buffer layer, an indium arsenide heavily-doped layer, a class II superlattice absorption layer and an aluminum-arsenic-antimony barrier layer are sequentially grown on the substrate in an epitaxial mode through a molecular beam epitaxy method; mechanically stripping the hexagonal boron nitride two-dimensional material, and transferring the stripped hexagonal boron nitride to the aluminum-arsenic-antimony barrier layer to form a Van der Waals heterojunction and composite barrier layer structure; depositing electrodes by using an ultraviolet lithography technology and a thermal evaporation mode to form one electrode arranged on the gallium antimonide buffer layer and the other electrode arranged on the boron nitride; a large-numerical-aperture micro-lens array is processed on a substrate, and the micro-lens array is composed of gallium antimonide cylinders with a phase modulation function; therefore, the antimonide medium-wave infrared detector with the composite barrier layer can be formed, the quantum efficiency is improved, the order of magnitude of dark current is reduced, and room-temperature medium-wave infrared detection can be realized.

The invention belongs to the field of functional textile materials, and provides a cool-feeling anti-ultraviolet nylon fabric and a preparation method thereof, and the cool-feeling anti-ultraviolet nylon fabric adopts a design scheme of combining a boron nitride / titanium dioxide composite filler with a beta-hydroxyl ether type ultraviolet absorption silane coupling agent surface modification technology. Uniform loading of hexagonal boron nitride on the surface of anatase type titanium dioxide is realized through an in-situ heat treatment process, a composite structure with heat conduction and ultraviolet shielding functions is constructed, and a complete process flow of master batch preparation, melt spinning, weaving, after-treatment and the like is matched; the ultraviolet protection coefficient UPF of the fabric is not lower than 40, the UPF retention rate after 20 times of household washing cycles is not lower than 80%, and the cool feeling qmax at the contact moment is not lower than 0.20 W / cm, the technical problem that an existing nylon fabric is insufficient in ultraviolet resistance and cool feeling function is solved, and the fabric has wide industrial application value.

The invention discloses a graphite crucible silicon infiltration resistant coating based on a gradient boron nitride-silicon carbide composite structure and a preparation method thereof. The coating is composed of hexagonal boron nitride nanosheets, beta-type silicon carbide nanowires, yttrium aluminum garnet precursor sol and the like, and effective blocking of 1500-1600 DEG C silicon melt is achieved through gradient structural design and an in-situ self-repairing mechanism. The preparation process comprises the steps of h-BN activation, S C carbon layer deposition, slurry mixing and spraying and segmented heat treatment. The molten silicon contact angle of the coating reaches 158 + / -2 degrees at the temperature of 1550 DEG C, through cracks do not exist after 50 times of thermal shock circulation, the coating is effective after being continuously used for 48 batches under the industrial working condition, the problems of silicon infiltration interface adhesion and thermal shock failure of a traditional graphite crucible are solved, and the coating has remarkable industrial application value.

The invention provides a preparation method of a wurtzite boron nitride material, which comprises the following steps: performing high-temperature and high-pressure treatment on hexagonal phase boron nitride powder at the pressure of 10-15 GPa and the temperature of 900-1300 DEG C, keeping the pressure for 120-240 minutes, and keeping the temperature for 40-120 minutes, thereby obtaining the wurtzite boron nitride material. According to the method provided by the invention, the pure-phase wurtzite boron nitride block material is prepared by taking low-cost hexagonal boron nitride powder as a starting material, and synthesis of the high-purity and high-performance wurtzite boron nitride block material is realized under relatively mild conditions by optimizing high-temperature and high-pressure synthesis parameters and an experimental assembly structure. The Vickers hardness of the obtained material reaches 46 + / -2.3 GPa under the loading of 1 kg, the thermal stability reaches 1085 DEG C, and excellent superhardness and high temperature resistance are shown. The method is simple in process, raw materials are easy to obtain, the dependence of a traditional method on a high-cost precursor and a complex process is broken through, and the method has a good industrial application prospect.

The invention relates to the technical field of polymer composite materials, and discloses a nano-ceramic-based composite insulating coating and a preparation method thereof, and the coating is prepared from a composite resin matrix, a composite functional ceramic filler, a double-reactivity organosilicon linker and an initiator. Wherein the composite resin matrix is composed of vinyl-terminated polydimethylsiloxane and a vinyl ether functionalized fluorocarbon copolymer, and a soft and rigid interpenetrating network structure is formed. The composite functional ceramic filler is prepared from needle-shaped silicon nitride, flaky hexagonal boron nitride, nano silicon dioxide, nano cerium oxide and nano barium titanate. According to the invention, a chemical bonding interface is constructed between the inorganic filler and the organic resin, and the synergistic effect of the composite matrix and the multifunctional filler is optimized, so that the coating has excellent adhesive force, flexibility and thermal shock resistance, obtains high volume resistivity and breakdown strength, and meets the insulation protection requirements under harsh working conditions.

Composite multilayered material compositions are provided which contain one or more hexagonal boron nitride (hBN)-containing layers, together with layers comprising optional polymeric binders, glass fibers, magneto-ceramic materials, and a super-hydrophobic outer coating. Methods are provided for making the composite materials and products containing them. The composite materials are useful for making radomes and other coverings for electronic components and equipment.

The invention discloses a protective coating for an aluminum alloy heat exchange tube and a preparation method of the protective coating, and relates to the technical field of coating materials. The protective coating for the aluminum alloy heat exchange tube at least comprises the following raw materials in parts by mass: 100 parts of bisphenol A epoxy resin; 28 to 32 parts of polyether amine D230; 8 to 12 parts of a modified MgAlCe-BTC-LDH filling material; 4 to 6 parts of polydopamine modified hexagonal boron nitride; 35 to 45 parts of propylene glycol methyl ether acetate; and 1-2 parts of a dispersant. The modified MgAlCe-BTC-LDH filler prepared by the invention realizes triple functions of Ce element oxidation resistance, BTC corrosion inhibition and layered barrier, and the polydopamine modified hexagonal boron nitride prepared by the invention effectively improves the heat-conducting property, solves the contradiction between insulation and heat conduction, and adapts to the protection requirement of an aluminum alloy heat exchange tube.

The invention discloses a high-temperature-resistant and corrosion-resistant coating for an aluminum alloy heat exchange tube and a preparation method thereof, and relates to the technical field of coating materials. The method comprises the following steps that the aluminum alloy heat exchange tube is cleaned and deoiled, then a treating agent is sprayed, composite coating slurry is sprayed to the surface of the aluminum alloy heat exchange tube after curing, and the high-temperature-resistant and corrosion-resistant coating for the aluminum alloy heat exchange tube is obtained after curing treatment. Wherein the treating agent is prepared from NS-30 silica sol, deionized water and methyltrimethoxysilane; the composite coating slurry is prepared from a polyamide acid solution, a synergist, functionalized boron nitride nanosheets, modified hexagonal boron nitride, a flatting agent and a defoaming agent. The silane film introduced into the treating agent and the synergist, the functionalized boron nitride nanosheet and the modified hexagonal boron nitride introduced into the composite coating slurry effectively improve the high temperature resistance, the corrosion resistance, the adhesive force, the thermal conductivity, the aging resistance and the toughness of the coating. Therefore, the method has a wider application prospect.

An exemplary embodiment of the present disclosure provides a method for making an electrolyte, comprising: providing a solid polymer electrolyte (SPE); incorporating boron nitride with the SPE to form a composite polymer electrolyte (CPE), wherein the boron nitride is at least one of exfoliated hexagonal boron nitride (ex-BN) or fluorine-fimctionalized hexagonal boron nitride (BN-F).

The invention relates to the field of nylon materials, in particular to a high-temperature-resistant nylon / PTFE composite material and a preparation method and application thereof. The high-temperature-resistant nylon / PTFE composite material is prepared from the following raw materials in parts by weight: 40 to 90 parts of modified nylon, 0.5 to 15 parts of polytetrafluoroethylene, 5 to 15 parts of composite filler, 1 to 3 parts of compatilizer and 0.1 to 0.3 part of antioxidant, the composite filler comprises modified calcium fluoride whiskers, modified glass beads and modified hexagonal boron nitride. Through collaborative design of multiple performance dimensions such as interface, heat resistance, wear resistance, mechanics and the like, the composite material has excellent high-temperature stability, low-friction wear resistance and high-strength mechanical performance at the same time, has remarkable breakthrough in comprehensive performance and service life compared with a traditional nylon-based composite material, and has extremely high technical innovation and practical value.

The invention discloses a high-wear-resistance modified polypropylene material and a preparation process thereof. The material comprises the following components in parts by weight: isotactic polypropylene, a beta nucleating agent, a heterofunctional hexagonal boron nitride nanosheet, an elastomer, an antioxidant system and a surface migration accelerant, one side of the nanosheet is treated by amino silane, and the other side of the nanosheet is treated by fluorine-containing silane. The material is prepared through twin-screw melt blending granulation and injection molding, in the molding process, variable mold temperature is adopted, contact pressure is applied to the surface of a product to promote directional migration and orientation of nanosheets in a cortex area, and then annealing is conducted. The Janus structure and the surface migration accelerant cooperate to realize a fluorine-containing low-surface-energy self-lubricating surface layer with an outward surface; the beta nucleating agent induces beta crystal formation to improve toughness. The scheme has the advantages of simple process and easily available raw materials, and is suitable for polypropylene products with higher wear resistance requirements, such as automotive interiors and household appliance shells.

The invention belongs to the technical field of narrow-band optical radiation imaging, and particularly relates to a narrow-band EUV and BEUV radiation imaging device based on a nano polycrystalline hexagonal boron nitride scintillator. The imaging device is composed of a nano polycrystalline hexagonal boron nitride scintillator plated with Zr, Mo or Nb metal, a high-precision camera, a vacuum interface flange and a shielding shell, and narrow-band selective imaging can be achieved in the wave band of 6-14 nm. The radiation imaging device has high sensitivity, narrow-band selectivity and excellent radiation resistance to 13.5 nm EUV light and 6.7 nm BEUV light, and compared with a traditional YAG-based imaging device, the radiation imaging device has remarkable advantages. The invention provides an innovative solution for high-performance EUV and BEUV radiation imaging, and has important application value in the field of EUV and BEUV beam diagnosis.

The invention provides a modified high-temperature-resistant heat-insulating anticorrosive coating and a preparation method thereof. The modified high-temperature-resistant heat-insulating anticorrosive paint comprises a component A and a component B, the component A comprises organic silicon resin, epoxy resin, a polyaniline-nano metal oxide-graphene oxide composite material, hollow glass beads and hexagonal boron nitride; the component B comprises an organic silicon modified amine curing agent, an anhydride curing agent, a titanate catalyst and an accelerant. The modified high-temperature-resistant heat-insulating anticorrosive paint has excellent corrosion resistance, high-temperature-resistant heat-insulating performance and high-temperature cracking resistance, and also has the advantages of strong adhesive force and short surface drying time. The modified high-temperature-resistant heat-insulating anticorrosive paint provided by the invention is suitable for corrosion protection of metal components exposed in high-temperature and complex corrosive environments for a long time.

The invention relates to the technical field of special cables, and discloses a high and low temperature resistant composite insulating layer cable and a preparation method thereof.The cable comprises a conductor core and a composite insulating layer wrapping the conductor core, and the composite insulating layer comprises a high temperature resistant heat conduction core layer and a low temperature resistant elastic layer; the high-temperature-resistant heat-conducting core layer is prepared from the following raw material: polyamide acid; hexagonal boron nitride; alpha-phase silicon carbide; the preparation method comprises the following steps: adding gamma-amino propyl triethoxy silane; nano barium titanate; the low-temperature-resistant elastic layer is prepared from the following raw materials: vinyl terminated polydimethylsiloxane; performing hydrophobic treatment on fumed silica; a Karstedt catalyst; a hydrogen-containing silicone oil crosslinking agent; the average particle size D50 of the 1-ethynyl-1-cyclohexanol and the alpha-phase silicon carbide is 0.5 to 2 mu m. According to the invention, by adopting a microwave selective heating and interlayer heat conduction mechanism, efficient and high-quality integrated curing of the composite insulating layer is realized.

The invention provides a design method of high-temperature-resistant particles for energy storage of a thermal power plant, and belongs to the technical field of ultrahigh-temperature fluidized energy storage.The design method comprises the steps that a game optimization model is established to determine a basic formula of an energy storage material, and a contribution value jitter increasing and expanding algorithm is adopted to construct a sparse heat conduction matrix; a particle dispersion path optimization algorithm is used for controlling distribution of a hexagonal boron nitride heat conduction enhancer, expanded graphite and carbon fibers are mixed according to the proportion of 3: 1, a silane coupling agent is added for high-temperature composite treatment, a uniform coating layer is formed through an anti-oxidation coating precursor, and the particle size of particles is controlled within the range of 50-200 micrometers through airflow classification. And finally, a surface modifier and a fluidity improver are added to finish surface treatment in a high-temperature fluidized bed, so that the technical problems of material structure failure and heat storage performance degradation caused by thermal stress accumulation in a repeated thermal cycle process of the energy storage particles in a high-temperature environment are solved.

The invention discloses an LTCC (Low Temperature Co-Fired Ceramic) green tape as well as a preparation method and application thereof, and the preparation method comprises the following steps: mixing LTCC formula powder and additive phase powder to obtain mixed powder; mixing the mixed powder, a dispersing agent and a solvent, and performing first ball milling treatment to obtain a first ball milling product; adding an adhesive and a plasticizer into the first ball-milling product, and carrying out second ball-milling treatment to obtain a second ball-milling product; filtering the second ball-milled product to obtain ceramic slurry for tape casting; drying the casting ceramic slurry to obtain an LTCC (Low Temperature Co-Fired Ceramic) green tape; wherein the weight ratio of the LTCC formula powder to the additive phase powder is (50-95): (5-50); the LTCC formula powder comprises ceramic powder and glass powder; the additive phase powder is at least one of hexagonal boron nitride, fluorophlogopite sheets, bismuthate-based tungsten bronze and phosphate glass. According to the LTCC green tape prepared by the preparation method disclosed by the invention, the technical problem that the machinability and the thermal conductivity of an LTCC green substrate prepared by an existing LTCC green tape are relatively poor can be solved.

The invention relates to the field of rubber blanket production and processing, and particularly discloses a high-elasticity printing rubber blanket which comprises maleic anhydride grafted ethylene propylene diene monomer for a surface layer, core-shell nanoparticles, hydrogenated butadiene-acrylonitrile rubber for a compressible layer, a crystalline polyethylene glycol sacrificial template agent and a multifunctional acrylate cross-linking agent, the synergistic auxiliary agent system comprises the following components: a microcapsule self-repairing agent, a polymerization catalyst, a reactive block copolymer surfactant and flaky hexagonal boron nitride; the preparation method comprises the following steps: S1, preparing a composite sizing material; S2, integrally compounding; S3, carrying out radiation curing; and S4, carrying out post-treatment molding. A synergistic auxiliary aid system of a microcapsule self-repairing agent and a polymerization catalyst is compounded in the surface layer rubber, the healing agent can be subjected to in-situ polymerization under the action of the catalyst to repair damage, and the beneficial effects of actively inhibiting fatigue crack propagation and remarkably prolonging the overall service life of the rubber blanket are achieved.

The invention relates to the technical field of polymer functional composite materials and battery heat management, in particular to an insulating heat-conducting material for a new energy battery and a preparation method of the insulating heat-conducting material. The invention aims to solve the technical problems of insufficient toughness, poor thermal conductivity and poor insulativity of an insulating heat-conducting material. The material disclosed by the invention adopts an A-B-C-B four-layer structure: the layer A is an outer layer, a matrix is homo-polypropylene, and aluminum oxide treated by a silane coupling agent is filled, so that excellent electric insulativity, electrolyte corrosion resistance and mechanical protection can be provided; the layer B is a transition toughening layer, a matrix is homo-polypropylene, polyolefin elastomer and maleic anhydride grafted polypropylene are added, and the transition toughening layer is used for releasing stress and improving toughness and interlayer bonding force; the layer C is a core heat conduction layer, homo-polypropylene serves as a base body, hexagonal boron nitride and aluminum oxide which are treated by a silane coupling agent are filled, and a main body heat conduction path is constructed. The material provided by the invention has improved mechanical flexibility, thermal conductivity and insulativity, and meets the strict requirements of new energy battery thermal management.

The invention provides a preparation method and application of modified boron nitride, and the preparation method comprises the following steps: carrying out plasma ball milling on a mixture comprising hexagonal boron nitride and a silane coupling agent solution to obtain the modified boron nitride. The preparation method is simple in process, hexagonal boron nitride can be modified in one step, the problem that the surface activation condition of boron nitride is harsh is effectively solved, and the obtained modified boron nitride is more excellent in heat-conducting property and has high compatibility with a polymer matrix.

The invention discloses a high-thermal-conductivity bending-resistant TPU (thermoplastic polyurethane) sheathed cable and a manufacturing process thereof, the cable comprises a cable conductor, an insulating layer, a shielding layer and a sheath layer which are sequentially coated from inside to outside, and the sheath layer is prepared from the following components in percentage by weight: 60-75% of TPU resin, 20-35% of hexagonal boron nitride, 1.5-4% of two-dimensional graphene oxide, 0.5-2% of a chain extender, 1.5-3.5% of a coupling agent, 1-3% of a lubricant and 0.3-1% of an antioxidant; wherein the mass ratio of the hexagonal boron nitride to the two-dimensional graphene oxide is (6-12): 1. According to the high-thermal-conductivity bending-resistant TPU sheath cable and the manufacturing process thereof, the requirements of rail transit high-voltage cables, robot flexible cables and other scenes needing high heat dissipation performance and bending resistance can be met.

The invention discloses a preparation method of composite powder for an integrally-formed inductor, the composite powder and the inductor, and relates to the technical field of inductor preparation. The preparation method comprises the following steps: preparing modified resin from hexagonal boron nitride; preparing composite powder, and performing sealed stirring coating on the composite powder and the modified resin; and carrying out extrusion granulation on the coated composite powder to obtain the final required composite powder. According to the preparation method, the high-heat-dissipation and low-loss composite powder for the integrally-formed inductor can be prepared.

The invention relates to the field of advanced ceramic materials, in particular to a ceramic matrix composite (CMC) and a preparation method thereof. The technical problems that a traditional CMC preparation technology is long in period, poor in structural uniformity and insufficient in toughness are solved. According to the method, surface-modified aluminum oxide ceramic microspheres are used as reinforcements, the surfaces of the microspheres are sequentially modified with hexagonal boron nitride nanosheets and a metal nickel catalyst, the microspheres, silicon carbide nanoparticles and a polycarbosilane precursor are mixed to form slurry, and a complex component is formed through multi-material additive manufacturing. A green body is prepared by using a 3D printing technology combining photocuring and material extrusion; carrying out ultraviolet curing on the green body, and carrying out staged heat treatment in an inert atmosphere, so that the precursor polymer is subjected to cross-linking curing, and meanwhile, carbon nanowires grow through in-situ catalysis; and finally, sintering under a pressurizing condition to realize matrix densification. The preparation period is greatly shortened, and the obtained composite material is uniform in structure, compact in matrix and excellent in mechanical property.

The invention discloses a preparation method of a photovoltaic high-thermal-conductivity insulating PVB intermediate film, and relates to the technical field of photovoltaic module packaging materials.The preparation method comprises the steps that hydroxylation treatment and silane coupling agent surface grafting modification are carried out on hexagonal boron nitride, PVB resin and a plasticizer are premixed to obtain pre-plasticized PVB resin, and the pre-plasticized PVB resin is subjected to surface grafting modification through a silane coupling agent; the modified hexagonal boron nitride and the pre-plasticized PVB resin are subjected to melt blending granulation through a double-screw extruder, composite granules are subjected to extrusion casting film forming through a single-screw extruder, and the high-thermal-conductivity insulating PVB intermediate film is prepared. The heat conductivity coefficient of the PVB intermediate film prepared by the invention can reach 0.5-2.0 W / (m.K), the volume resistivity is 1014-1016 omega.cm, and the PVB intermediate film is applied to photovoltaic module packaging, so that the heat dissipation performance of a module can be effectively improved, and the power generation efficiency is improved.

The invention relates to a semiconductor device, e.g. for the emission or absorption of light, preferably in the deep ultraviolet (DUV) range. The device, e.g. a resonant cavity light emitting diode (RCLED) or a laser diode, is formed from: a substrate layer (302), preferably comprising a distributed Bragg reflector (DBR); a graphitic layer (304); and at least one semiconductor structure (310), preferably a wire or a pyramid, grown on the graphitic layer, with or without the use of a mask layer (306). The semiconductor structure is constructed from at least one III-V semiconductor n-type doped region (316) and a hexagonal boron-nitride (hBN) region (312), preferably being p-type doped hBN.

The invention discloses an explosion-proof coating as well as a preparation method and application thereof. The raw materials of the coating comprise a component A and a component B, and the mass ratio of the component A to the component B is (100: 100)-(100: 50); wherein the component A is prepared from the following components in parts by weight: 70 to 90 parts of epoxy resin, 3 to 8 parts of reactive diluent, 2 to 6 parts of silane coupling agent and 0.5 to 3 parts of fumed silica; and the component B comprises the following components in parts by weight: 30-60 parts of a nano reinforced curing agent, 5-30 parts of aluminum hydroxide, 8-15 parts of ammonium polyphosphate, 3-10 parts of expanded graphite, 3-8 parts of zinc phosphate, 3-12 parts of hollow glass beads, 3-15 parts of hexagonal boron nitride, 3-10 parts of silicon carbide whiskers, 2-5 parts of graphene dispersion liquid, 5-10 parts of a solvent, 0.2-1.5 parts of a dispersing agent and 0.1-1 part of a defoaming agent. The coating disclosed by the invention has the functions of toughening, flame retardance, heat conduction and non-combustible gas release, and can be applied to flame-retardant and explosion-proof products.

The invention provides a pulse-direct current electrochemistry composite deposition process of a nickel-tungsten-phosphorus alloy coating, and belongs to the technical field of coating preparation, and the pulse-direct current electrochemistry composite deposition process comprises the following steps: carrying out silane coupling agent modification treatment on alpha-aluminum oxide; carrying out modification treatment on the hexagonal boron nitride nanosheet by adopting hexadecyl trimethyl ammonium bromide; carrying out polyacrylic acid modification treatment on the nano silicon dioxide; nickel salt, tungsten salt, phosphorus salt, a complexing agent, a buffering agent, a primary brightener, a secondary brightener, a wetting agent, modified aluminum oxide, modified boron nitride, modified silicon dioxide and deionized water are mixed, stirred and heated, and a composite plating solution is obtained; the substrate serves as a cathode, pulse current is applied to the substrate for pulse electroplating, then the current density of the pulse current is continuously and linearly reduced to a target value, and finally direct current electroplating is conducted under the target value; by optimizing the formula of the composite plating solution and the pulse-direct current composite electroplating process, the nickel-tungsten-phosphorus alloy composite plating layer with high hardness, low friction, high wear resistance and corrosion resistance is finally obtained.

The invention relates to the technical field of high polymer materials, in particular to a degradable PHA tableware material and a preparation method thereof. The degradable PHA tableware material overcomes the problem that the degradable PHA tableware material is poor in mechanical property and antibacterial property. The preparation method comprises the following steps: drying polyhydroxyalkanoate, poly (butylene succinate), acetylated lignin, nano-zinc oxide, chitosan oligosaccharide and hexagonal boron nitride, carrying out melt extrusion on the dried materials, maleic anhydride grafted PHA, acetyl tributyl citrate and cinnamyl aldehyde in a double-screw extruder, carrying out injection molding, and carrying out plasma treatment activation. Polyurethane antibacterial slurry containing silver-loaded zeolite is sprayed, the tableware material with the body-surface synergistic enhancement function is finally obtained, and the impact strength, rigidity and antibacterial rate of the material are improved.