86 results about "Dimethylsilane" patented technology

Disclosed in the present invention are a fluorosilicone-modified low-surface-energy antifouling coating and a preparation method therefor. The coating comprises the following components in parts by weight: 11-15 parts of butyl acrylate, 3-4 parts of dodecafluoroheptyl methacrylate, 3-4 parts of vinyl-terminated polydimethylsiloxane, 3-4 parts of 2-hydroxy-4-acryloyloxybenzophenone, 30-38 parts of methyl isobutyl ketone, 0.15-0.25 parts of azobisisobutyronitrile, 0.1-0.2 parts of sodium hydroxide, 2-3 parts of modified titanium dioxide nanoparticles, and 0.5-1.5 parts of 3-aminopropyltriethoxysilane. In the present invention, vinylpentamethyldisiloxane reacts with decamethylcyclopentasiloxane to prepare vinyl-terminated polydimethylsiloxane; a titanium dioxide precursor is mixed with polydopamine nanoparticles for modification to prepare modified titanium dioxide nanoparticles; and then the components above are mixed to prepare the fluorosilicone-modified low-surface-energy antifouling coating. The coating has low surface energy and good adhesion and ultraviolet resistance.

The invention belongs to the technical field of sewage treatment, and particularly relates to a demulsifier for eliminating an oil-water interface emulsion layer in oilfield produced liquid treatment and a preparation method of the demulsifier. The preparation method comprises the following steps: adding acrylamide, 1-allyl-3-methylimidazolium bis (trifluoromethanesulfonyl) imine salt, allyl tributyl phosphonium chloride and deionized water into a first reactor, and heating and dissolving the acrylamide, the 1-allyl-3-methylimidazolium bis (trifluoromethanesulfonyl) imine salt, the allyl tributyl phosphonium chloride and the deionized water; adding allyl (diisopropylamino) dimethylsilane, butyl acrylate, deionized water, octylphenol polyoxyethylene ether-10, lauryl sodium sulfate and monopotassium phosphate into the second reactor, and stirring to obtain an emulsion; adding an initiator and sodium hydrogen sulfite into a second reactor, carrying out heating and heat preservation reaction, pouring the mixed solution in the first reactor, and continuously carrying out reaction, heating and heat preservation to obtain a viscous liquid; and drying and granulating the viscous liquid to obtain the demulsifier. The demulsifier provided by the invention has the characteristics of simple synthesis process and high demulsification rate.

The invention discloses a polyether-ether-ketone polishing brush wire material and a preparation method thereof, and belongs to the technical field of brush wire material preparation. The polyether-ether-ketone polishing brush wire material is prepared from, by weight, 50-70 parts of polyether-ether-ketone, 8-13 parts of a modified flexibilizer, 5-10 parts of a modified stabilizer, 3-6 parts of a light stabilizer, 6-12 parts of a lubricant and 2-5 parts of graphite, the modified flexibilizer is prepared from allyl glycidyl ether, benzyl dimethyl silane, vinyl acetic acid and 4-methoxyphenol, and the modified flexibilizer is prepared from vinyl acetate and 4-methoxyphenol. The modified stabilizer is prepared from pentafluorobenzoic acid, potassium tert-butoxide, 1, 10-phenanthroline, pentafluorobromobenzene, 4-aminophenol and pyromellitic dianhydride. The polyether-ether-ketone polishing brush wire material prepared by the method has excellent toughness, organic solvent resistance and wear resistance.

The invention relates to blended modified asphalt and a preparation method thereof, and belongs to the technical field of asphalt material compositions. The blended modified asphalt is prepared from 90 # heavy traffic road petroleum asphalt, 70 # road petroleum asphalt, natural rock asphalt, an emulsifier op-10, an HDI-trihydroxymethyl hexyl lactone cross-linked polymer, phenylpropyl dimethyl siloxy silicate ester, vinyl-terminated polydimethylsiloxane, thermoplastic styrene-butadiene rubber, nanoscale calcium carbonate, organobentonite and diatomite according to a specific proportion. Polyethylene wax, an anti-rut agent, an antioxidant and the like. Wherein the natural rock asphalt is pre-modified by the HDI-trihydroxymethyl hexyl lactone cross-linked polymer, the 70 # road petroleum asphalt is pre-modified by the phenylpropyl dimethyl siloxy silicate ester, and the thermoplastic styrene-butadiene rubber is pre-modified by the vinyl terminated polydimethylsiloxane. The modified components are better in compatibility and good in blending homogeneity, the components are not easy to reject, and the blended modified asphalt is excellent in use performance.

The invention belongs to the technical field of polycarbosilane, and particularly relates to a synthesis method of polydimethylsilane and application of the polydimethylsilane in preparation of polycarbosilane. In the Wurtz polymerization reaction of polydimethylsilane, polar solvents such as crown ether, diethylene glycol dimethyl ether, hexamethylphosphoric triamide and polyether are added into a reaction system, and the polar solvents have a complexing effect on sodium ions, so that tight ion pairs can be promoted to become loose ion pairs, the concentration of active anions is greatly increased, and the reaction time is shortened; therefore, the initiation period of the reaction is shortened, the polymerization reaction speed is accelerated, the molecular weight of polydimethylsilane is improved, and the yield is improved; the molecular weight of the polydimethylsilane is increased, the pyrolysis activation energy of the polydimethylsilane is gradually reduced, and the prepared polycarbosilane has higher Si-H bonds, and is high in A-grade conversion rate and good in spinning performance; according to the method, original reaction equipment does not need to be changed, reaction process parameters are also in original design, and the method has practical application value.

The invention discloses moisture-proof and dust-proof epoxy paint and a preparation method thereof, and belongs to the technical field of paint. The invention discloses moisture-proof and dust-proof epoxy paint which comprises the following raw material components in parts by weight: 100 parts of high-temperature-resistant epoxy resin, 0.8-1.2 parts of a curing agent, 8-12 parts of waterproof silicon resin, 4-6 parts of a defoaming agent, 5 parts of a flatting agent, 10-15 parts of a solvent and 1-3 parts of an antistatic agent, the high-temperature-resistant epoxy resin is obtained by reacting and grafting 1-bromine-4-(trifluorovinyloxy) benzene, cardanol and phosphonitrilic chloride trimer and then performing epoxidation; the waterproof silicon resin is obtained by carrying out polycondensation on 3-glycidyl ether oxypropyl triethoxy silane and tetraethyl orthosilicate and then carrying out end capping by adopting 4-[trifluorovinyl (oxygen) phenyl] dimethylsilane.

The invention discloses a special aluminum fixing capacitor for an electronic detonator with ultralow electric leakage characteristic and a preparation method thereof, the capacitor comprises a positive foil electrode, a negative foil electrode, an aluminum foil or an aluminum alloy foil coated with an oxide film on the surface, electrolytic paper and an electrolyte, and the electrolyte can be a phosphate-based electrolyte, a borate-based electrolyte or an organic electrolyte containing high-conductivity salt, and an additive, the preparation method comprises the following steps: slitting positive and negative foils and electrolytic paper, winding the positive and negative foils and the electrolytic paper to form a concentric circle, forming a repair oxide film, dipping a conductive polymer material, baking and polymerizing to form a conductive film, injecting a pouring sealant into an aluminum shell, and carrying out heat treatment to obtain the conductive aluminum shell. The formation liquid is ammonium dihydrogen phosphate, ammonium adipate or boric acid aqueous solution, and the pouring sealant is epoxy resin or polyurethane; the capacitor has an ultra-low electric leakage characteristic, is suitable for being used as a power supply energy storage element in an electronic detonator system, stabilizes power supply output and inhibits an electric leakage phenomenon.

The invention discloses a hydrogel modified microelectrode array device and a preparation method thereof, the hydrogel modified microelectrode array device comprises a microelectrode array composite layer, a passivation layer, a hydrogel layer and a cell culture ring, the cell culture ring is arranged on the microelectrode array composite layer, and the passivation layer and the hydrogel layer are located in the cell culture ring; the microelectrode array composite layer comprises a microelectrode array with polydimethylsiloxane as a base material, at least part of the microelectrode array in the cell culture ring is exposed, and at least part of gaps of the exposed microelectrode array are filled with the passivation layer; the hydrogel layer grows on the surface of the polydimethylsilane, and a microgroove is formed in the exposed microelectrode array and passivation layer area to serve as a cell growth area. According to the invention, cell patterning can be realized on the microelectrode array, cell electrophysiological activity can be monitored for a long time, and the microelectrode array has the advantages of remarkable cell patterning promotion capability, high stability and robustness, flexible cell pattern design, excellent biological compatibility and simple process.

The invention belongs to the technical field of titanium dioxide composite materials, and discloses a preparation method and application of modified rutile type nano titanium dioxide. According to the preparation method, water and n-hexyl alcohol are taken as a microemulsion system, titanium tetrachloride is taken as a titanium source, lauryl sodium sulfate is taken as a surfactant, and rutile type nano titanium dioxide with good dispersity and small particle size is obtained through hydrothermal reaction; then carrying out surface modification by using toluene-2, 4-diisocyanate, so as to obtain modified rutile type nano titanium dioxide; and carrying out melt blending with a copolymer of styrene and an acrylate dimethylsilane monomer by taking the modified polystyrene as a filler to obtain the polystyrene material. Isocyanate groups contained on the surface of the modified rutile type nano titanium dioxide can react with hydroxyl groups of the polystyrene copolymer, so that the mechanical property, the high temperature resistance and the ultraviolet aging resistance of the material are remarkably improved.

The invention provides a high-performance organosilicon sealant for electronic packaging, and relates to the technical field of organosilicon sealants. The organic silicon sealant is prepared from the following raw materials: methyl vinyl silicone oil, vinyl dimethyl silane, a platinum catalyst, fumed silica, a B4Cw (at) ZrO2 compound, ethynyl cyclohexanol, a silane coupling agent, a titanate coupling agent, a cerium-zinc composite antioxidant and an auxiliary antioxidant. The B4Cw (at) ZrO2 compound is prepared from boron carbide whiskers and nano zirconium oxide sol; the cerium-zinc composite antioxidant is prepared from cerium nitrate, zinc nitrate and ammonia water. The preparation method of the high-performance organic silicon sealant for electronic packaging comprises the following steps: pretreating boron carbide whiskers, synthesizing a B4Cw-coated ZrO2 compound, preparing a cerium-zinc composite antioxidant, preparing a basic rubber material, and preparing the organic silicon sealant. The prepared organic silicon sealant is high in mechanical strength, excellent in elastic property and high in durability.

The invention belongs to the field of fire material evidence traceability, and particularly relates to a self-healing type fire material evidence logistics transportation buffer material and a preparation method thereof. Aiming at the problems that in the prior art, a buffer material for protecting fire material evidences is easy to damage, is not flame-retardant, cannot be self-closed and can cause confusion or loss of the material evidences, (4-vinylphenyl) dimethylsilane, 1-vinyl-3-butylimidazolium hexafluorophosphate ionic liquid and butadiene are used as raw materials, and are subjected to in-situ polymerization in pores of melamine sponge, so that the material evidences are formed; the buffer material with flame-retardant and self-healing functions is obtained by taking polymerization of the three raw materials as main materials and self-polymerization of the ionic liquid and butadiene as auxiliary materials, so that the possibility of scattering and losing of fire evidences is reduced, meanwhile, the cycle use frequency of the buffer material is greatly increased, and the buffer material is low in cost, convenient to popularize and use and good in economic benefit.

The invention belongs to the technical field of skin care products, and relates to full-layer anti-aging recombinant collagen filling powder as well as a preparation method and application thereof. The recombinant collagen filling powder is prepared from recombinant I type collagen, recombinant III type collagen, recombinant IV type collagen, recombinant VI type collagen, recombinant XVII type collagen, superoxide dismutase, a bifidus yeast lysate, trehalose, silica, silica dimethyl silylate and a polydimethylsiloxane / vinyl polydimethylsiloxane cross-linked polymer, and the recombinant collagen filling powder is prepared from the following raw materials: recombinant I type collagen, recombinant III type collagen, recombinant IV type collagen, recombinant VI type collagen, recombinant XVII type collagen, superoxide dismutase, bifidus yeast lysate, trehalose, silica, silica dimethyl silylate and a polydimethylsiloxane / vinyl polydimethylsiloxane cross-linked polymer. The skin care product is prepared from glycerin, xanthan gum, sodium hyaluronate, dimeticone, phenoxyethanol and ethylhexylglycerin. The recombinant collagen filling powder provided by the invention is convenient to use, can obviously improve the skin moisturizing capacity, improve the compactness and repair wrinkles, has a good anti-aging effect and a good repair effect, and has important practical significance and market value.

The invention discloses a low-dielectric optical transparent adhesive film and a preparation method thereof, and relates to the field of adhesive films. When the low-dielectric optical transparent adhesive film is prepared, nano silicon dioxide sequentially reacts with 2-(4-chlorosulfonylphenyl) ethyltrimethoxysilane and 2, 2 ', 4, 4'-tetrahydroxybenzophenone, and modified silicon dioxide is prepared; the modified silicon dioxide, 4-vinylpyridine, allyltrimethoxysilane, 2-ethylhexyl acrylate, butyl acrylate, hydroxyethyl acrylate, diallyl phosphate and isophorone diisocyanate are subjected to a reaction, then ferric chloride is added, a polytetrafluoroethylene plate is coated and cured, and an adhesive film matrix is prepared; and carrying out surface treatment on the adhesive film substrate by using dimethoxydimethylsilane to prepare the low-dielectric optical transparent adhesive film. The low-dielectric optical transparent adhesive film prepared by the invention has flame-retardant, durable and waterproof capabilities.

The present disclosure provides an X-ray sensing device. The X-ray sensing device includes a substrate, a first metal electrode, a second metal electrode, an X-ray photoelectric conversion layer, a third metal electrode, and an insulating layer. The first metal electrode and the second metal electrode are on the substrate and separated from each other. The X-ray photoelectric conversion layer extends continuously on the substrate and directly contacts the first metal electrode and the second metal electrode. The X-ray photoelectric conversion layer includes silicon, amorphous selenium, germanium, cadmium zinc telluride, bismuth iodide, lead oxide, Cs2TeI6 perovskite, CsPbBr3 perovskite, bismuth-based halide perovskite, 6,13-bis(triisopropylsilylethynyl)pentacene, poly(9,9-dioctylfluorene), polydimethylsilane, or combinations thereof. The third metal electrode and the insulating layer are on the substrate, and the third metal electrode is separated from the first metal electrode, the second metal electrode, and the X-ray photoelectric conversion layer by the insulating layer.

The invention belongs to the technical field of polysulfide sealants, and relates to a bi-component modified polysulfide sealant for a binding surface as well as a preparation method and application of the bi-component modified polysulfide sealant. The bi-component modified polysulfide sealant for the binding surface is prepared from a component A and a component B according to the mass ratio of 100: (8-12), the component A comprises modified polysulfide rubber, a functional filler, a coupling agent, an adhesive and a regulator; the modified polysulfide rubber is prepared from polysulfide rubber and a modifier; the modifying agent is one of bis (2-chloroethyl) ether, 1, 2-dichloroethane and bis (chloromethyl) dimethylsilane; and the component B comprises a metal oxide, a plasticizer, an accelerant and a regulator. According to the modified polysulfide sealant formed by two components, the elongation at break of the polysulfide sealant is improved in an extreme environment, the sealant has excellent deformation resistance, cracking, shrinkage and bonding failure of a sealant layer are avoided, and the sealing performance of a binding surface is improved.

The invention provides a preparation method of a Schottky contact for radiation detection based on a cadmium telluride single crystal, and solves the problems of Fermi level pinning and uncontrollable interface morphology of the cadmium telluride Schottky contact prepared by the existing method. The Schottky contact is successfully prepared by adopting a transfer method, the metal electrode and the substrate are separated by utilizing polydimethylsiloxane and a tungsten steel gold-plated probe through a mechanical stripping method, then the metal electrode is directly lapped on the clean cadmium telluride surface, and the adhesion between the polydimethylsilane and the metal electrode is reduced through heating, so that the Schottky contact is prepared. Finally, separation of the polydimethylsilane and the metal electrode and preparation of the cadmium telluride surface metal electrode are achieved.

The application belongs to the field of new daily chemical materials, and particularly relates to an oil control and moisture retention composition, which comprises PEG-7 glyceryl cocoate 0.5-1.5%, PCA sodium 0.1-1%, bis-PEG-18 methyl ether dimethyl silane 1-3%, sage leaf oil 0.005-0.02%, and verbena oil 0.005-0.02%. The composition uses PEG-7 glyceryl cocoate, PCA sodium and bis-PEG-18 methyl ether dimethyl silane as main components, and uses sage leaf oil and verbena oil as oil components, so that the comprehensive oil control and moisture retention effect is achieved, the blood microcirculation and microecology of the scalp are improved, and the dandruff, oil control and moisture retention can be effectively achieved. Meanwhile, the application also provides the application of the composition.

Provided is an ultraviolet-curable silicone composition for stereolithography comprising: (A) organopolysiloxane having two groups indicated by formula (1) in a molecule (in the formula, R1 represents a monovalent hydrocarbon group, R2 represents an oxygen atom or an alkylene group, and R3 represents an acryloyloxyalkyl group, a methacryloyloxyalkyl group, an acryloyloxyalkyloxy group, a methacryloyloxyalkyloxy group, a (acryloyloxyalkyl) dimethylsilyloxy group, or a (methacryloyloxyalkyl) dimethylsilyloxy group, where p represents a number satisfying 0 ≤ p ≤ 10, and a represents a number satisfying 1 ≤ a ≤ 3); (B) hydrophobic silica particles having an average particle diameter of 10-1,000 nm and a degree of hydrophobicity of 60% or more by a methanol titration method; and (C) a photopolymerization initiator.

The invention relates to the technical field of oil polish, in particular to high-leveling water-based oil polish and a preparation process thereof. The high-leveling water-based glazing oil is prepared from the following components in parts by weight: 10 to 25 parts of deionized water, 20 to 45 parts of modified acrylate emulsion, 0.1 to 0.5 part of a defoaming agent, 0.1 to 3 parts of a leveling agent, 0.1 to 2 parts of a wetting agent and 1 to 3 parts of a coalescing agent. The preparation method comprises the following steps: uniformly mixing deionized water and an emulsifier, adding styrene, methyl methacrylate, butyl acrylate, acrylic acid, methacryloyloxymethyl phenyl dimethyl silane and double-bond-containing nano calcium carbonate, uniformly mixing, and carrying out a polymerization reaction under the action of an initiator to prepare a modified acrylate emulsion; and uniformly mixing the modified acrylate emulsion, deionized water, a defoaming agent, a flatting agent, a wetting agent and a coalescing agent, and filtering to prepare the high-leveling water-based oil polish with high glossiness and strong wear resistance.

Compositions comprising an alkyloxylated decyne diol, a poly-alkylene glycol, and / or a polydimethylsilane are disclosed. Embodiments of the present disclosure may be useful for decreasing the quantity of foam present or generated in compositions used for ophthalmic lens generation and / or precision optical fabrication, for example during grinding or polishing steps.

The invention discloses a high-strength asphalt composite material and a preparation method thereof, and relates to the technical field of asphalt materials. The high-strength asphalt composite material comprises the following raw materials in parts by weight: 60-80 parts of matrix asphalt, 5-15 parts of glass fibers, 3-10 parts of a nano inorganic filler, 0.5-3 parts of an anti-stripping agent, 1-5 parts of a plasticizer and 0.5-1 part of a modified antioxidant, the preparation method comprises the following steps: reacting 2-n-propyl-4-methyl-6-carboxyl benzimidazole with thionyl chloride to generate an acyl chloride compound; reacting the acyl chloride compound with bis (4-aminophenoxy) dimethyl silane to generate silane modified benzimidazole; enabling the silane modified benzimidazole to react with 11-bromine-1-undecanol to generate a long-chain compound; and reacting the long-chain compound with ethylenediamine tetraacetic acid dianhydride to generate the anti-stripping agent. The high-strength asphalt composite material prepared by the invention has good anti-stripping strength and oxidation resistance.

The present application relates to the technical field of aircraft maintenance cleaning, and provides an aircraft surface salt removal and prevention cleaning agent and a cleaning method, the cleaning agent comprising the following components in percentage by mass: 0-30% of glycerol, 15-30% of a composite metal protective agent and 2-5% of an anti-salt protective agent, and the balance being distilled water, the composite metal protective agent comprising organic amine, organic acid, ethoxylated phosphate ester and benzotriazole, and the anti-salt protective agent comprising polydimethylsilane emulsion and potassium ferrocyanide; the cleaning agent effectively avoids the corrosion of salt water solution on the aircraft body material, especially metal material and metal plating, during the cleaning process, has good corrosion protection effect, and through the steps of rinsing and air drying or wiping, a protective film can be formed on the surface of the aircraft body, the crystallization of chlorides on the surface of the aircraft body is destroyed, the adhesion is reduced, the re-salting speed is effectively slowed down, and the cleaning agent is especially suitable for the salt removal and maintenance cleaning of military shipboard aircraft and near-shore military aircraft which are exposed to high-salt marine environment for a long time and have long-time low-altitude flight during flight.

The present invention relates to an oil-dispersed cosmetic composition having excellent suspension stability and, specifically, to an oil-dispersed cosmetic composition having excellent powder dispersibility, suspension stability, and formulation stability by optimally mixing a hydrogenated castor oil / sebacic acid copolymer as an oil thickener and silica dimethylsilylate as a dispersant.

The present invention relates to the field of ceramic technology, and particularly to a silicon carbide-based ceramic material, a preparation method thereof, and a large-size silicon carbide ceramic furnace tube. The method includes: S1, mixing silica and toluene, and then dropwise adding dichloromethylsilane for a primary reaction to obtain silanized silica; S2, mixing silanized silica and toluene, and then dropwise adding a zero-valent platinum Karstedt catalyst for a secondary reaction, and then adding allyldimethylsilane for a tertiary reaction to obtain polycarbosilane-grafted silica; S3, mixing polycarbosilane-grafted silica, silicon carbide, and a sintering aid and performing a primary ball milling, and then adding a binder for a secondary ball milling to obtain a ceramic slurry; S4, injecting the ceramic slurry into a mold and drying to obtain a green body, and sintering the green body to obtain the silicon carbide-based ceramic material. The ceramic material provided by the present invention has excellent density, toughness, and thermal shock resistance.

The invention discloses medical liquid silica gel and a preparation method thereof, and relates to the technical field of silica gel materials. The method comprises the following steps: drying vinyl-terminated polydimethylsiloxane with a side chain containing vinyl, and carrying out addition reaction on part of polydimethylsiloxane and dehydrated 1H, 1H, 2H, 2H-perfluorodecyl dimethyl silane to obtain a fluorine-containing modified liquid silica gel matrix; the preparation method comprises the following steps: coating dopamine-coated nano-diamond with a silicon dioxide layer, and then grafting vinyl trimethoxy silane and octyl triethoxy silane, so as to prepare a modified wear-resistant filler; the preparation method comprises the following steps: mixing a fluorine-containing modified liquid silica gel matrix, a modified wear-resistant filler, vinyl MQ silicon resin and a catalyst to prepare a component A; mixing the residual dry base rubber with hydrogen-containing silicone oil and 3-methyl-1-butyne-3-alcohol to prepare a component B; and finally, mixing and curing the component A and the component B. The prepared liquid silica gel has excellent wear resistance and mechanical properties, and is suitable for the field of medical apparatuses and instruments.

This invention provides a composite flame-retardant material formed by combining organosilicon resin and hybrid flame-retardant particles. The organosilicon resin is formed by the hydrolysis and condensation of a mixture of organosilicon monomers. The organosilicon monomer mixture includes monomethylsilane monomer, dimethylsilane monomer, monophenylsilane monomer, and diphenylsilane monomer. The hybrid flame-retardant particles include nanoparticles modified with a mercaptosilane coupling agent. The surface of the mercaptosilane coupling agent-modified nanoparticles is grafted with phosphonic acid groups. Compared with the prior art, this invention introduces phosphorus by grafting phosphonic acid groups onto the surface of the mercaptosilane coupling agent-modified nanoparticles, thereby improving the flame-retardant performance by combining phosphorus with silicon, while reducing the silicon content and avoiding its impact on mechanical properties. This allows the composite flame-retardant material to be used for surface flame retardancy of polyurethane materials, improving their flame-retardant efficiency and smoke suppression effect without affecting the inherent properties of the polyurethane material.

This invention discloses a moisture-proof and dust-proof epoxy paint and its preparation method, belonging to the field of coating technology. The moisture-proof and dust-proof epoxy paint disclosed in this invention, by weight, comprises the following raw material components: 100 parts by weight of high-temperature resistant epoxy resin, 0.8-1.2 parts by weight of curing agent, 8-12 parts by weight of waterproof silicone resin, 4-6 parts by weight of defoamer, 5 parts by weight of leveling agent, 10-15 parts by weight of solvent, and 1-3 parts by weight of antistatic agent. The high-temperature resistant epoxy resin is obtained by epoxidation after grafting 1-bromo-4-(trifluorovinyloxy)benzene, cashew nut shell powder, and hexachlorocyclotriphosphazene. The waterproof silicone resin is obtained by polycondensation of 3-glycidyl etheroxypropyltriethoxysilane and tetraethyl orthosilicate followed by end-capping with 4-[trifluorovinyl(oxy)phenyl]dimethylsilane.

The application relates to the technical field of composite materials, and particularly relates to a silicon carbide fiber composite core wire and a preparation method. Dimethyldichlorosilane is obtained to carry out dechlorination polymerization, polydimethylsilane is generated, high-temperature and high-pressure cracking rearrangement is carried out, and polycarbosilane is obtained; the polycarbosilane is melted and extruded through a spinning hole to obtain continuous polycarbosilane original fibers, the continuous polycarbosilane original fibers are crosslinked to obtain crosslinked fibers, high-temperature cracking is carried out, and the crosslinked fibers are converted into inorganic silicon carbide fiber bundles; the silicon carbide fiber bundles are immersed in a high-temperature resistant resin glue solution and enter a heated pultrusion mold to be pultruded into a silicon carbide fiber composite core rod; inner layer aluminum wires are twisted outside the silicon carbide fiber composite core rod, and outer layer aluminum wires are twisted outside the inner layer aluminum wires to obtain the silicon carbide fiber composite core wire. The prepared composite core wire has the outstanding advantages of high strength, high modulus, high-temperature resistance, oxidation resistance, corrosion resistance, a low thermal expansion coefficient and large conveying capacity, and has important economic benefits in power transmission line capacity increasing and reconstruction projects.

The application discloses a preparation method of a photocurable rare earth doped low-oxygen silicon carbide fiber, and comprises the following steps: preparing liquid sol A by taking a rare earth metal organic complex and polydimethylsilane as raw materials; obtaining a polycarbosilane precursor B containing a rare earth metal element by evaporating a solvent and high-temperature cracking reaction of the sol A; then preparing modified polycarbosilane by blending reaction of the polycarbosilane precursor B and an unsaturated organic ether; and then performing infusibilization treatment on the modified polycarbosilane by ultraviolet light irradiation under the action of a photoinitiator after melt spinning; and finally obtaining the rare earth doped low-oxygen silicon carbide fiber after high-temperature sintering treatment. f The rare earth element is introduced in the preparation of the precursor, and the rare earth element is uniformly dispersed in the silicon carbide crystal lattice, and the silicon carbide original wire is subjected to infusibilization crosslinking treatment by combining photo-curing, so that the crystal growth and electromagnetic properties of the ceramic can be better improved while the oxygen content of the silicon carbide fiber is reduced.

The invention provides high-purity polydimethylsilane and a preparation method thereof, and the preparation method comprises the following steps: adding dimethyldichlorosilane and alkali metal into a benzene solvent under the protection of inert gas, and reacting at high temperature to obtain a product; adding alcohol into the product, neutralizing unreacted raw materials, and then filtering to obtain crude polydimethylsilane; providing a cleaning container provided with two layers of filter screen assemblies, and adding the crude polydimethylsilane between the two layers of filter screen assemblies; a cleaning solvent is added into the cleaning container to be higher than the upper-layer filter screen assembly, and cleaning is conducted; a part of liquid in the cleaning container is discharged from the upper part of the upper-layer filter screen assembly, and then the residual liquid is discharged from the lower part of the lower-layer filter screen assembly; and repeating for multiple times, and finally evaporating to obtain the high-purity polydimethylsilane. According to the method, the content of oxygen-containing silane, chloride ions and alkali metal ions in the polydimethylsilane can be reduced, and the high-purity polydimethylsilane with the oxygen content lower than 0.5%, the chloride ion content lower than 20 ppm and the alkali metal ion content lower than 20 ppm is obtained.