1058 results about "Chlorosilane" patented technology

The invention discloses water-based formaldehyde-free woodworking glue and a preparation method thereof, and relates to the technical field of woodworking glue. When the water-based formaldehyde-free woodworking glue is prepared, firstly, n-butyllithium is used as an initiator to initiate cyclosiloxane and an acrylate monomer to be polymerized, then dimethyl chlorosilane is used for blocking to obtain pre-modified polyacrylate, and the pre-modified polyacrylate is used for preparing the water-based formaldehyde-free woodworking glue. Reacting the pre-modified polyacrylate with vinyl diphenylphosphine, and then reacting with 3-(4-bromophenyl)-1-propylene to obtain modified polyacrylate; secondly, reacting the 4-(trimethoxysilyl) butyraldehyde modified silicon dioxide with chitosan, and then reacting with mercaptoacetic acid to obtain modified silicon dioxide; finally, mixing the modified polyacrylate, the modified silicon dioxide, an emulsifier, a defoaming agent, pure water and a photoinitiator to obtain the water-based formaldehyde-free woodworking glue. The water-based formaldehyde-free woodworking glue prepared by the invention has flame retardance and antibacterial property.

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

The invention belongs to the technical field of pharmaceutical chemical processes, and particularly relates to a preparation method of a penem antibiotic intermediate 4-BMA, which comprises the following steps: adding Zn powder, chlorosilane, aliphatic tertiary amine, zinc salt and 4-AA in a formula (I) into THF (tetrahydrofuran), uniformly stirring, dropwise adding a THF solution of alpha-haloamide with an induction group in a formula (II) for reaction, filtering the reaction solution, removing the zinc powder, and drying to obtain the penem antibiotic intermediate 4-BMA. Extracting the filtrate to obtain a THF phase, washing with an aqueous solution of potassium oxalate, and recovering THF to obtain a formula (III); and carrying out oxidative hydrolysis, sulfur dioxide quenching, sulfur dioxide acid regulation crystallization and recrystallization on the formula (III) to obtain the intermediate 4-BMA. According to the preparation method disclosed by the invention, a zinc salt is used as a catalyst during preparation of the formula (III), potassium oxalate is used for removing residual Zn (II) in a THF phase, SO2 is used for quenching hydrogen peroxide and acid regulation and crystallization of 4-BMA, the oxygenolysis problem of 4-BMA is solved, and the preparation method has the characteristics of greenness, safety and high efficiency, is strong in product competitive advantage and is suitable for industrial production.

The invention relates to a corrosion-resistant flame-retardant cable and a preparation method thereof, and belongs to the technical field of special flame-retardant cables. The cable is composed of a bunched wire core and a protective sleeve on the surface, and the protective sleeve is prepared from, by weight, 100 parts of PVC resin, 10-15 parts of POE resin, 12-16 parts of insulating filler, 25-30 parts of flexibilizer, 4.8-5.5 parts of stabilizer, 9-13 parts of modified phosphorus-silicon flame retardant, 0.13-0.16 part of antioxidant and 4.5-5.8 parts of lubricant. The modified phosphorus-silicon flame retardant is substituted by hydroxyl single-terminated silicone oil and vinyl trichlorosilane to form a compound with multiple silicon chains and alkenyl, namely an intermediate, DOPO and the alkenyl on an intermediate molecule are subjected to addition, DOPO serving as a phosphorus flame-retardant material is grafted to the intermediate molecule, a large number of silicon chain-DOPO-PVC layered structures are formed in the near surface layer of the protective sleeve, and the flame-retardant protective sleeve is formed. And the shielding, corrosion-resistant and flame-retardant effects are achieved.

The invention relates to a glass fiber reinforced PET composite material and a preparation method thereof, and belongs to the technical field of polymer composite materials. The composite material is prepared from the following raw materials in parts by weight: 100 parts of PET (Polyethylene Terephthalate) master batch, 32 to 45 parts of modified glass fiber, 0.19 to 0.24 part of nucleating agent, 1.6 to 2 parts of lubricating agent and 0.12 to 0.15 part of antioxidant, the modified glass fiber is prepared by grafting sulfydryl on the surface of glass fiber by KH-580 to prepare sulfhydrylated glass fiber, reacting tert-butyldimethylamine with 2-bromoethanol to form hydroxyl-terminated quaternary ammonium salt, substituting with octylene trichlorosilane to form a modifier, and adding alkenyl containing alkyl long chains introduced into the modifier molecule with the sulfydryl grafted on the surface to prepare the modified glass fiber. Introducing modifier molecules to the surfaces of the glass fibers; and the modified glass fiber improves the strength of the composite material and keeps high impact resistance.

The invention discloses a stable curing material of high-expansibility heavy metal polluted clay and a preparation method of the stable curing material, belongs to the technical field of engineering materials and environmental engineering, and is used for solving the technical problems that in the prior art, all curing components in the stable curing material are poor in binding property and poor in adsorbability to polluted heavy metal elements. The preparation method comprises the following steps: synthesizing an intermediate A from composite carbide slag pellets, a modified adhesive, an alkaline excitation material, dead burned magnesium oxide, metakaolin, polyvinyl alcohol, chlorocyclopropane and methyltrimethoxysilane, reacting allyl bromide with methyl trichlorosilane to obtain allyl chlorosilane, reacting the intermediate A with allyl chlorosilane to obtain the modified calcium carbide slag pellets. The modified adhesive with high viscosity and strong adsorbability is obtained, the fly ash, the modifier and the carbide slag are mixed, and high-strength and high-stability composite carbide slag pellets are obtained through spheroidizing treatment and high-temperature calcination, so that the prepared stable curing material has the advantages of being excellent in adsorption curing performance and good in overall stability.

The present invention refers to a SiC and Chlorosilane production system 2540, comprising at least one CVD SiC production reactor 850, in particular SiC fluidized bed reactor 850a, in particular according to claim 9, and a Chlorosilane production unit 2550, wherein the Chlorosilane production unit 2550 comprises at least a bed reactor 2416, in particular a fixed bed reactor or a fluidized bed reactor, for generating Chlorosilanes by reacting at least one fraction of the vent gas mixture provided via the vent gas outlet 216 of the CVD SiC production reactor 850 and Si, wherein further fractions of the vent gas mixture at least comprise H2 and a C-bearing molecule, in particular methane, and wherein Si is provided as solid 2398 inside the bed reactor 2416.

The invention relates to the field of copper-clad plates, and discloses a high-performance flame-retardant low-dielectric-loss copper-clad plate and a preparation method thereof.The copper-clad plate comprises epoxy resin, benzoxazine resin, composite filler, carboxyl-terminated nitrile rubber, an active diluent, a curing agent and the like; the composite filler is prepared by compounding flame-retardant modifier grafted graphene oxide and epoxy silane modified silicon dioxide hollow spheres; according to the flame-retardant modifier, boric acid and pentaerythritol are used for preparing a double-terminal hydroxyl boron-containing intermediate, then dichlorodiphenyl silane and phenylphosphonic dichloride react with hydroxyl groups at the two ends of the intermediate to prepare a flame-retardant intermediate, and amino silane and vanillic aldehyde react with chlorine atoms at the two ends of the intermediate to prepare an aldehyde modified flame-retardant intermediate; the copper-clad plate prepared by the preparation method disclosed by the invention is low in dielectric constant and dielectric loss, high in heat conductivity coefficient and good in flexibility, and also has excellent heat resistance and flame retardance.

The invention discloses an organic silicon filler surface treating agent with asymmetric different ends, a preparation method and application, and belongs to the field of organic silicon materials. The different-end asymmetric organic silicon filler surface treating agent is prepared by the following steps: A, adding a mixed solution of an organic cyclic siloxane monomer and an initiator into a reaction kettle, then adding an organic alkali solution, and carrying out stirring polymerization reaction at room temperature for 1-6 hours; and B, adding chlorosilane and an acid-binding agent into the polymerized system in the step A to carry out an end-capping reaction, continuously stirring for 1-20 hours, and then removing low-boiling-point substances and filtering, thereby obtaining the product. The organic silicon filler surface treating agent is accurate in molecular chain structure, controllable in double-terminal active groups, simple in preparation process and mild and controllable in reaction process, is applied to surface modification treatment of heat-conducting (electric-conducting) inorganic filler, can remarkably improve the compatibility between the inorganic filler and an organic silicon polymer, and has a good application prospect in the field of heat-conducting (electric-conducting) inorganic filler surface modification treatment. The dispersity and the filling amount of the inorganic filler in the polymer are improved, the heat conduction (electric conduction) performance of the organic silicon composite material is improved, and the viscosity of the composite material is reduced.

The invention relates to the technical field of water treatment, in particular to a composite flocculant for tunnel construction wastewater treatment and a preparation method thereof. The method comprises the following steps: carrying out a reaction on triethanolamine and isocyano ethyl methacrylate to prepare tertiary amine acrylate; reacting tertiary amine acrylate with methoxyl-polyethylene glycol-chlorine to prepare polyethylene glycol modified quaternary ammonium salt acrylate; further reacting with methyl dichlorosilane to prepare a modifier; and compounding the modifier with hydrotalcite, sodium silicate and an iron-magnesium-calcium mixed solution to prepare the composite flocculant. The flocculant realizes efficient flocculation and pH regulation through mechanisms such as electric neutralization and adsorption bridging, has the characteristics of quickly gathering suspended particles, reducing sludge yield and improving floc compactness and dehydration performance, is suitable for treatment of high-concentration suspended solids and slightly alkaline wastewater, shows comprehensive advantages of high efficiency, economy and environmental protection, and has wide application prospects. The field treatment requirements of tunnel construction wastewater are met.

The invention discloses three-dimensional hydrophobic modified activated carbon, which is characterized in that hydrophobic carbon chains are grafted inside and outside activated carbon pores, and the hydrophobic carbon chains are trichlorosilane with different carbon chain lengths. The invention also discloses a preparation method of the three-dimensional hydrophobic modified activated carbon, and the preparation method comprises the following steps: (1) pretreatment: the activated carbon is firstly placed in distilled water for ultrasonic cleaning for 5-10 min, then soaked in a pretreatment activation solution for 5-10 min, and then placed in a drying oven for drying, and the pretreatment activation solution is an ammonia water solution with the pH value of 8-9; (2) three-dimensional modification: taking 5-10 parts by weight of a modifier, dropwise adding the modifier into 20-50 parts by weight of a solvent to obtain a modifier solution, soaking 10-15 parts by weight of pretreated activated carbon into the modifier solution, sealing the whole reaction system, and immediately soaking the reaction system in an ultrasonic environment for 2-4 hours; and (3) post-treatment: cleaning the impregnated activated carbon with a solvent, and carrying out vacuum drying in a vacuum drying oven at 100-150 DEG C for 5-12 hours to obtain the three-dimensional hydrophobic modified activated carbon.

The invention relates to a high-gloss high-glass-fiber-content nylon 66 composite material and a preparation method thereof, and belongs to the technical field of polymer composite materials. The composite material is prepared from the following components in percentage by weight: 50 to 60 percent of alkali-free glass fiber, 2.2 to 3.5 percent of highlight compatibilizer, 3.5 to 5 percent of flexibilizer, 0.15 to 0.2 percent of antioxidant, 0.6 to 0.9 percent of processing aid and the balance of nylon 66 resin, the high-gloss compatibilizer is prepared by the following steps: substituting n-alkyl alcohol and vinyl trichlorosilane to prepare an intermediate 1, initiating addition by methyl mercaptoacetate and unsaturated double bonds of the intermediate 1 to prepare an intermediate 2, and finally performing amine ester exchange on gamma-aminopropyltriethoxysilane and terminal methyl ester of the intermediate 2. The highlight compatibilizer effectively reduces the content of a high crystal region-low crystal region interface in a composite system and reduces scattering of light, so that the composite material keeps higher glossiness.

The present invention provides a method for preparing dimethyldichlorosilane. The method comprises: performing a cracking and disproportionation reaction on high-boiling substances produced as a by-product in the production of an organosilicon monomer dimethyldichlorosilane under the action of a Ni@ZSM-5 catalyst encapsulating nickel nanoparticles to prepare dimethyldichlorosilane. The method not only solves the problem of a large amount of excess high-boiling substances in the production process of the organosilicon monomer and realizes high-value utilization of the high-boiling substances, but also has easy-to-control reactions, simple processes, and mild conditions. Moreover, the method has a single-pass conversion rate of the high-boiling substances of ≥90%, and a selectivity for dimethyldichlorosilane of ≥70%, thus having broad prospects for industrial application.

The invention relates to a composite catalyst for improving synthesis of methylchlorosilane and a preparation method of the composite catalyst, and belongs to the technical field of composite catalysts. The catalyst comprises a main catalyst (a compound of cuprous chloride and metal zinc, the molar ratio of Cu to Zn being 1: (0.1-0.5)), a co-catalyst (alumina or stannic chloride, the mass of which is 5%-20%) and a carrier (porous silica gel or nitrogen-doped activated carbon, the loading capacity of which is 3-8 times). Through optimization of catalyst composition, carrier functionalization (such as sulfydryl modification) and a preparation process, the selectivity (greater than or equal to 85%) of dimethyldichlorosilane is remarkably improved, and the stability and activity of the catalyst are enhanced. The preparation method comprises the steps of ball milling and heat treatment of the main catalyst, addition of the cocatalyst, acid pickling and modification of the carrier, loading and drying of the catalyst and the like. The method has the advantages of high selectivity, good stability, simple process and the like, and is suitable for efficient synthesis of methyl chlorosilane.

The invention relates to a preparation method and application of a long-acting antibacterial hydrophobic fabric, and belongs to the technical field of functional fabric materials. Aiming at the problems of antibacterial agent loss, hydrophobic function decline and antibacterial and hydrophobic synergism failure after repeated washing of the fabric, the method comprises the following steps: pre-treating the fabric to remove impurities, and constructing a functional layer step by step: immersing polyester or cotton fabric into a 2-8wt% chitosan quaternary ammonium salt aqueous solution, and carrying out vacuum pressurization impregnation at 75-85 DEG C to form an antibacterial layer; mixing octadecyl trichlorosilane with deionized water to prepare a pre-hydrolyzed emulsion, diluting the pre-hydrolyzed emulsion, and spraying the diluted pre-hydrolyzed emulsion on the surface of the fabric in a graded gradient manner to construct a hydrophobic layer; and finally, curing at 60-80 DEG C to form a coating layer. The fabric prepared by the method has lasting antibacterial property, super-hydrophobicity and blood adhesion resistance, can be used for medical protective articles such as operating gowns and medical bed sheets needing high-frequency cleaning, and can effectively prevent cross infection.

The invention provides a preparation method of a coated particle dispersion fuel, which comprises the following steps: mixing silicon carbide powder and a binder according to a preset mass ratio, banburying and granulating to obtain a silicon carbide matrix feed; printing a silicon carbide shell green body by using powder extrusion printing equipment and the silicon carbide matrix feed; degreasing the silicon carbide shell green body by using a degreasing solvent to obtain a silicon carbide shell brown blank; a cavity of the silicon carbide shell brown blank is filled with cladding fuel particles, and pores of the cladding fuel particles are filled with silicon carbide powder; and filling the filled silicon carbide shell brown blank into a chemical vapor infiltration device, generating silicon carbide by the introduced methyl trichlorosilane, filling a gap between the silicon carbide powder and the silicon carbide shell green blank with the silicon carbide, and obtaining the coated particle dispersion fuel after the chemical vapor infiltration is completed. By adopting powder extrusion printing and chemical vapor infiltration methods, the problems that the irradiation swelling resistance of existing coated particle dispersion fuel is reduced, the heat conductivity is low, and the loading capacity of coated fuel particles is limited are solved.

The invention relates to a perovskite photovoltaic cell high-transmittance low-scattering coating material and a preparation method thereof, and belongs to the technical field of photovoltaic cells. The coating material is prepared from the following components in percentage by weight: 7.2 to 8.5 percent of PMMA (Polymethyl Methacrylate) resin, 0.17 to 0.22 percent of modified nano titanium dioxide, 0.09 to 0.11 percent of flatting agent, 0.03 to 0.04 percent of defoaming agent and the balance of solvent, the modified nano titanium dioxide is prepared into an intermediate through addition reaction of triallylamine and mercaptoethanol, and then a modifier with a network molecular structure is formed through substitution reaction of trifluoropropyl trichlorosilane and hydroxyl at the end part of an intermediate molecule; a thioether chain segment in a modifier molecule and similar nitrogen and oxygen elements form a strong chelation effect to coat the nano titanium dioxide; the introduction of the modified nano titanium dioxide makes up the problem of light transmission reduction caused by traditional titanium dioxide reinforcement.

The invention discloses a graphene conductive adhesive and a preparation method thereof, and relates to the technical field of adhesives. When the graphene conductive adhesive is prepared, polyethylene glycol diglycidyl ether and an ultraviolet absorbent react to prepare a functionalized epoxy monomer; the preparation method comprises the following steps: polymerizing a dihydroxy diphenyl phosphorus-containing monomer and phenyl dichlorosilane, and coating graphene with the polymerized dihydroxy diphenyl phosphorus-containing monomer and phenyl dichlorosilane to prepare pre-modified graphene; the pre-modified graphene and allyl glycidyl ether are subjected to a reaction, and modified graphene is prepared; carrying out polymerization growth on 5, 6-dihydroxyindole and 6-aminomethylindole on the pre-modified cellulose to prepare modified cellulose; and uniformly mixing epoxy resin, a functionalized epoxy monomer, the modified graphene, the modified cellulose, isophorone diamine and acetone to prepare the graphene conductive adhesive. The graphene conductive adhesive prepared by the invention has excellent anti-aging, flame-retardant, conductive and adhesive properties and mechanical properties.

The invention discloses a preparation method of diiodosilane, and belongs to the technical field of material synthesis. The preparation method of diiodosilane comprises the following steps: adding a first iodine source and a second iodine source into a closed reactor in an inert gas atmosphere, and dissolving the first iodine source and the second iodine source in a solvent to form a uniform solution; and reducing the temperature, and adding liquid dichlorosilane. Raising the temperature to 30 to 80 DEG C and reacting; and after the reaction is finished, heating at reduced pressure, rectifying and purifying to obtain the high-purity electronic-grade diiodosilane. The first iodine source is lithium iodide, the second iodine source is at least one of sodium iodide or potassium iodide, and the solvent comprises at least one of acetonitrile, acetone, diethyl ether or ethanol. Lithium iodide and sodium iodide or potassium iodide are compounded, a specific solvent is matched, and a one-step method is used for testing, so that the input cost of raw materials is reduced, the experimental steps are simplified, the reaction rate of a reaction system can be improved, and the purity of a diiodosilane product is improved.

The invention discloses an anti-aging and anti-corrosion coating and a preparation method thereof, and relates to the technical field of coatings. When the anti-aging and anti-corrosion coating is prepared, firstly, tetramethyl tetravinyl cyclotetrasiloxane, n-butyllithium and dimethyl-3-chloropropyl chlorosilane react to obtain modified polysiloxane, then 4-vinylpyridine, methyl methacrylate and n-butyl acrylate are copolymerized and then react with the modified polysiloxane, and then bis (4-chlorphenyl) phosphine is grafted to obtain the anti-aging and anti-corrosion coating. Finally, reacting with p-aminodiphenylamine to obtain modified acrylic resin; secondly, enabling the titanium dioxide nanosheet pretreated by 3-aminopropyltrimethoxysilane to react with ester phthalocyanine, and then hydrolyzing to obtain a modified titanium dioxide nanosheet; finally, mixing the modified acrylic resin, the modified titanium dioxide nanosheet, a solvent, a dispersing agent and a defoaming agent to obtain the anti-aging and anti-corrosion coating. The anti-aging and anti-corrosion coating prepared by the invention has excellent anti-aging, anti-corrosion, flame-retardant and antibacterial properties.

The invention relates to a wear-resistant high-strength glass protection safety film and a preparation method thereof, and belongs to the technical field of safety films. The silicon carbide whisker, the modified nano titanium dioxide and the graphene oxide are jointly prepared into the composite filler, and the strength and the wear resistance of the film are remarkably improved by utilizing the three-dimensional network structure of the silicon carbide whisker, the efficient filling and reinforcing effects of the nano titanium dioxide and the layered structure reinforcement of the graphene oxide; the permeation of small molecular substances such as moisture and oxygen is effectively blocked, and the barrier property of the membrane is improved. Meanwhile, the silane coupling agent is added, so that the compatibility and dispersity of the composite filler and the water-based resin emulsion are improved. The surface of the membrane is modified by heptadecafluorodecyl trichlorosilane, the hydrophobic performance of the membrane is remarkably enhanced, water vapor condensation and dust and dirt accumulation are reduced, meanwhile, the durability of the membrane is improved, and the wear resistance of the membrane is enhanced through chemical bonding.

The invention relates to the field of immersed coolants, and discloses a low-density high-thermal-conductivity composite silicone oil coolant and a preparation method thereof, the method comprises preparation of naphthyl-terminated aryl silicone oil and application of the naphthyl-terminated aryl silicone oil to a base liquid of the silicone oil coolant, and the thermal conductivity of the silicone oil coolant is improved. Dissolving dimethyldichlorosilane in tetrahydrofuran, dropwise adding a naphthalene Grignard reagent into the mixed solution, and after the reaction is finished, carrying out quenching, extraction and other processes to obtain dimethylnaphthalene aryl chlorosilane; adding a potassium carbonate solution into the dimethyl naphthyl aryl chlorosilane, and extracting after reaction to obtain dimethyl-naphthyl siloxane alcohol; adding a tin catalyst into the dimethyl-naphthyl siloxane alcohol, carrying out vacuum reaction, rectifying and purifying to obtain tetramethyl dinaphthyl disiloxane; the naphthyl-terminated aryl silicone oil is prepared by taking DMC as a raw material, KOH potassium as a catalyst and tetramethyl dinaphthyl disiloxane as an end capping agent. The composite silicone oil cooling liquid with low density, high specific heat capacity and stable structure is prepared by stirring, mixing and compounding.

The invention discloses a filtrate reducer based on modified humic acid and a preparation method of the filtrate reducer, and relates to the technical field of oilfield chemistry. The preparation method of the filtrate reducer comprises the following steps: taking modified humic acid, N, N-dimethylacrylamide, N-vinyl imidazole, long-chain acrylate and hydroxyethyl acrylate, dissolving in a solvent, then adding an initiator, and reacting to obtain the filtrate reducer, wherein during preparation of the modified humic acid, firstly, the modified humic acid is activated by low-concentration potassium permanganate, and then the activated modified humic acid reacts with methyl chlorosilane. The filtrate reducer prepared by the preparation method disclosed by the invention has relatively good temperature-resistant and salt-resistant performance and relatively good filtrate reduction performance. The preparation method is simple, the raw materials are simple and easy to obtain, the cost is low, and popularization is easy.

The invention relates to the technical field of silicon carbide powder manufacturing, in particular to a high-purity silicon carbide powder synthesis method which comprises the steps that S1, graphite paper or carbon fiber cloth is pasted to a resistance heating material and / or the inner wall of a deposition chamber, and the resistance heating material is connected to an electrode; s2, the pressure in the deposition chamber is adjusted to a vacuum state or replaced with an argon atmosphere, and the temperature is increased to 900-1300 DEG C; s3, methyl trichlorosilane, silicon chloride, hydrogen, argon and hydrocarbon gas are conveyed into the deposition chamber in proportion for deposition for 10-150 h, and a silicon carbide block is obtained; s4, the obtained silicon carbide blocks are sequentially subjected to crushing treatment and cleaning treatment, and silicon carbide powder is obtained; and S5, carrying out high-temperature treatment on the silicon carbide powder to obtain the silicon carbide powder for silicon carbide single crystal growth. The method can improve the production efficiency of the silicon carbide powder and reduce the production cost; the synthesized silicon carbide powder has controllable particle size and high purity.

The invention belongs to the technical field of chromatographic filling, and particularly relates to mesoporous silica microspheres, a preparation method and application. According to the preparation method, tetraethylenepentamine functional modified template microspheres and oligomeric silica anions generated by hydrolysis of a silicon source are subjected to an electrostatic anchoring effect, so that self-nucleation of the silicon source is inhibited; the surface of the template microsphere is covered by a lying configuration, so that the steric hindrance is reduced, the diffusion of a silicon precursor in a silicon source solution is promoted, and the yield of the mesoporous silica microsphere is improved; the surface of mesoporous silica is grafted and modified by octadecyl trichlorosilane silicon hydroxyl to form a highly crosslinked Si-O-Si skeleton, so that the mechanical strength of the microspheres is improved, the column efficiency loss is reduced, and the comprehensive yield and performance of high performance liquid chromatography are improved.

The invention provides a copper-doped silicon carbide composite material and a preparation method and application thereof, and relates to the technical field of electromagnetic wave absorbing materials. The preparation method of the copper-doped silicon carbide composite material provided by the invention comprises the following steps: performing arc plasma cracking on a precursor containing silicon and carbon to obtain the copper-doped silicon carbide composite material, the precursor containing silicon and carbon comprises organic chlorosilane; an anode adopted by the arc plasma cracking comprises copper. The prepared copper-doped silicon carbide composite material has excellent electromagnetic wave absorption performance and large effective absorption bandwidth.

The invention relates to the technical field of organic silicon resin preparation, in particular to trapezoidal methyl silicon resin and a preparation method thereof.The trapezoidal methyl silicon resin is prepared by taking methyl trichlorosilane as a main raw material, introducing a trapezoidal control agent containing amido and alkoxy at the same time to inhibit the reaction activity of the methyl trichlorosilane and then carrying out hydrolysis reaction in a small amount of alcohol solvent and water; the generation of a cross-linked network structure insoluble substance during hydrolysis is avoided, and the resin gelation risk is effectively reduced. The hydrolysis rate is reduced, so that the use amount of the solvent is reduced, the proportion of alcohol in the water phase is greatly reduced, and the process and environmental protection cost is reduced. The trapezoidal methyl silicone resin prepared by the method is excellent in viscosity performance, high in yield, excellent in boiling resistance, short in curing time, high in resin softening point and short in gelation time.

The invention relates to the technical field of polycrystalline silicon system catalysts, in particular to a preparation method of a polycrystalline silicon catalyst for new energy, which comprises the following steps: preparing mesoporous polystyrene microspheres; the preparation method comprises the following steps: dispersing mesoporous polystyrene microspheres in a metal salt solution for precipitation reaction, dispersing the obtained supported polystyrene microspheres in ethanol, then adding stronger ammonia water and tetraethyl orthosilicate for stirring reaction to obtain supported silicon dioxide microspheres; and calcining in a carbon monoxide atmosphere to prepare the polycrystalline silicon system catalyst. According to the preparation method, loading and precipitation of metal salt are carried out by dissolving a large number of mesopores in polystyrene microspheres, then the polystyrene microspheres loaded with metal precipitation particles are fixed by a sol-gel method, and the interior and the surface of the generated silicon dioxide microspheres are mingled with the loaded polystyrene microspheres; and high-temperature reduction calcination is carried out in the atmosphere of carbon monoxide, so that the prepared polycrystalline silicon system catalyst has relatively high tetrachlorosilane conversion rate and long-time use stability.

The invention relates to the field of polyurethane, and discloses a preparation method of a linear reaction type phosphorus-nitrogen-silicon synergistic flame-retardant solvent-free polyurethane coating, which comprises the following steps: S1, carrying out exchange reaction on phosphonate and alcohol amine ester to obtain a phosphorus-nitrogen polyol intermediate; s2, carrying out condensation polymerization on the phosphorus-nitrogen polyol intermediate and chlorosilane to obtain phosphorus-nitrogen-silicon polyol; s3, mixing polyester / polyether polyol, a chain extender and an amine / metal catalyst to obtain a component A; mixing and reacting isocyanate, part of polyester / polyether polyol and phosphorus-nitrogen-silicon polyol to obtain a component B; mixing the component A and the component B, spraying the mixture on release paper, and curing. Through a synergistic flame-retardant mechanism of phosphorus, nitrogen and silicon, the balance of efficient flame retardance, mechanical properties and excellent coating properties is realized. The solvent-free system realizes zero emission of volatile organic compounds, and the linear reaction type design ensures that the mechanical properties and durability of the coating are not influenced.

The invention relates to the field of protective films, and discloses a liquid crystal display light guide plate TPE protective film and a preparation method thereof, the protective film comprises modified SBS, polypropylene, modified nano calcium carbonate, a lubricant and a plasticizer; the modified nano calcium carbonate is prepared by grafting a modified additive on the surface of nano calcium carbonate through chemical reaction and then coordinating with copper ions; the modified additive is prepared by preparing a chlorinated silicon-containing intermediate by using dichlorodiphenyl silane, diethylene glycol and cyanuric chloride as raw materials and then grafting a component I and 3-aminopropyltrimethoxysilane; the component I is prepared from 5-chloromethylthiazole and p-phenylenediamine through a reaction, and the modified SBS is prepared from epoxidized SBS and nano titanium dioxide subjected to amination modification by 3-aminopropyltriethoxysilane through a ring-opening reaction. The film material is endowed with excellent tensile strength, aging resistance and antibacterial and flame-retardant effects.