603 results about "Chlorosilane" patented technology

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 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 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 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 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 present application provides a nickel-based composite catalyst with core-shell structure, a preparation method and use thereof, the nickel-based composite catalyst with core-shell structure comprises a Ni@ZSM-5@S-1 core-shell structure and an alumina carrier, the Ni@ZSM-5@S-1 core-shell structure comprises a Ni@ZSM-5 core layer and a S-1 molecular sieve nanolayer coated outside the Ni@ZSM-5 core layer. The catalyst provided by the present application is used in the reaction of preparing chlorosilane monomer by directional catalytic cracking of organic silicon high-boiling matter, the cracking rate of high-boiling matter is more than 95%, and the selectivity of chlorosilane monomer is more than 95%.

The invention relates to the technical field of adhesives, and discloses a preparation method of an epoxy resin adhesive, which comprises the following steps: reacting p-aminophenol with diphenyl dichlorosilane under the catalysis of triethanolamine to obtain di (p-aminophenoxy) diphenyl silane; the preparation method comprises the following steps: carrying out Mannich reaction on amino in di (p-aminophenoxy) diphenyl silane, amino in polyether amine, formaldehyde and phenol to obtain the silane-containing polyether amine type benzoxazine intermediate. And finally, uniformly mixing the silane-containing polyether amine type benzoxazine intermediate and epoxy resin, and curing to obtain the epoxy resin adhesive. The prepared silane-containing polyether amine benzoxazine intermediate contains a silane structure and a benzoxazine structure, both the silane structure and the benzoxazine structure have excellent heat resistance, and the epoxy resin adhesive prepared by adding the silane-containing polyether amine benzoxazine intermediate into epoxy resin has excellent heat resistance.

The invention discloses a silane and chlorosilane mixed gas treatment process and a control system and method, and relates to the technical field of waste gas treatment in polycrystalline silicon production, and the process comprises the following steps: S1, mixed gas pretreatment; s2, deep removal of chlorosilane; s3, silane is removed, after three-stage treatment, the content of silane in tail gas is smaller than or equal to 1.0 mg / m < 3 >, the content of chlorosilane is smaller than or equal to 1.0 mg / m < 3 >, and then the tail gas is emptied, meanwhile, the control system and the control method suitable for the process are disclosed, optimization treatment of mixed process gas containing chlorosilane, silane, nitrogen and hydrogen generated in polycrystalline silicon production is achieved, use of alkali liquor is reduced, and the production cost is reduced. The emission is reduced, and the production cost is reduced.

The invention provides a continuous synthesis system of gamma-chloropropyltrichlorosilane. The continuous synthesis system comprises a trichlorosilane storage tank, a chloropropene storage tank, a catalyst storage tank, a static mixer, an n-stage series tubular reaction system and a rectification device, the tubular reaction system comprises a tubular reactor, a back pressure valve, a degassing device and a condenser; a liquid phase outlet of the degassing device and a liquid phase outlet of the condenser are connected with a next-stage tubular reactor; the trichlorosilane storage tank, the chloropropene storage tank and the catalyst storage tank are respectively connected with an inlet of the static mixer, and an outlet of the static mixer is connected with the first-stage tubular reactor; the inlet feed of the second to nth stages of tubular reactors comprises chloropropene; a liquid phase outlet of the nth-stage degassing device is connected with an inlet of the rectification device, and the rectification device is connected back to the first-stage tubular reactor and outputs a gamma-chloropropyltrichlorosilane product. The reaction efficiency and the conversion rate are improved, and the production energy consumption and the cost are low. The invention further provides a synthesis method based on the system, and the technological process is simple.

The invention relates to a preparation method of a low-resistance silicon carbide coating based on a molybdenum / tantalum metal electrode, which comprises the following steps: S1, substrate pretreatment: carrying out mechanical micro roughening, ultrasonic cleaning and drying on a Mo / Ta electrode, and then reducing to remove an oxidation film; s2, Si-rich nucleation: taking methyl trichlorosilane as a Si / C common source, hydrogen as carrier gas / reducing gas and nitrogen as an n-type doping source for gas supply to form a compact nucleation layer; s3, main body deposition is conducted, specifically, the temperature is adjusted to 1140-1180 DEG C, the total pressure is maintained to be 80-120 Torr, and gas supply continues to be conducted for deposition; s4, annealing and dechlorination: stopping methyl trichlorosilane, keeping hydrogen and nitrogen flushing, and then annealing; and S5, cooling and shaping: cooling and taking out the sample annealed in the step S4, and adjusting the surface roughness to a set value to obtain the low-resistance silicon carbide coating on the Mo / Ta electrode. Compared with the prior art, on the premise that conductivity is not sacrificed, atomic oxygen / oxygen ion resistance, sputtering resistance, thermal cycling stability and the like of the Mo / Ta electrode can be remarkably improved.

A method is disclosed comprising providing a carbonaceous substrate; performing a chemical vapor deposition process on the carbonaceous substrate using a mixture of precursor gasses comprising a silicon precursor gas comprising trichlorosilane, and a carbon precursor gas selected from carbon-carbon double bond hydrocarbons and carbon-carbon triple bond hydrocarbons; and via said chemical vapor deposition process, forming a polycrystalline cubic silicon carbide layer with crystallographic orientation.

The electronic-grade silane gas continuous production preparation system comprises a cold hydrogenation treatment device, an inlet of the cold hydrogenation treatment device is connected with a raw material supply system, and an outlet of the cold hydrogenation treatment device is connected with a cold hydrogenation rectifying tower through a pipeline. The cold hydrogenation rectifying tower is sequentially connected with the boron and phosphorus removal adsorption column, the first-stage disproportionator, the first tower, the second tower, the second-stage disproportionator, the third tower and the fourth tower through pipelines, and electronic-grade silane in the fourth tower is used for being conveyed to a silane tank area; the first tower is used for removing silicon tetrachloride produced after the disproportionation reaction of the first-stage disproportionator; the second tower is used for separating the extracted chlorosilane material; the third tower is used for separating silane from chlorosilane; and the fourth tower is used for discharging light impurities and heavy impurities and conveying gas-phase electronic-grade silane into a silane tank area. The device and the method realize continuous, efficient and high-purity production of the electronic-grade silane gas, and have the advantages of low energy consumption, low cost, thorough impurity removal and the like.

The invention discloses a preparation method of a warm-keeping and health-care composite fabric, and relates to the technical field of functional fabrics. The preparation method comprises the following steps: firstly, combining fumed silica with graphene oxide hydrogel to prepare mixed aerogel; the mixed aerogel is combined with allyl trichlorosilane, and is grafted to a macromolecular chain of polypropylene through maleic anhydride, so that the compatibility is improved, and the agglomeration problem is solved; secondly, calcining tourmaline, then directly carrying out quenching hydration modification, combining Si-OH groups on the surface with active groups in a polyester molecular chain, and spinning into hollow fibers; the mixed aerogel can absorb far infrared rays dissipated and emitted by the modified tourmaline, and the aerogel absorbing the far infrared rays can generate a resonance effect and a warm effect and permeate into the deep layer of the skin; the modified tourmaline has the capability of generating negative ions, and the gull rock powder is added for combined action, so that the antibacterial effect is achieved by destroying the structure of bacteria, and the health-care effect is achieved. The composite fabric prepared by the invention has warm-keeping and health-care effects.

The invention relates to the field of biomimetic materials, in particular to a biomimetic self-cleaning anti-fouling aquaculture net cage material, a preparation method and application of the biomimetic self-cleaning anti-fouling aquaculture net cage material. 0.5 to 2.0 parts by weight of a carboxylated graphene nanosheet; 2.0 to 5.0 parts by weight of nitrogen-doped titanium dioxide nanoparticles; 1.0 to 3.0 parts by weight of silica nanoparticles; 5.0 to 10.0 parts by weight of calcium ion cross-linked modified sodium alginate; 1.0 to 3.0 parts by weight of octadecyl trichlorosilane; 0.5 to 1.5 parts by weight of lauryl sodium sulfate; through the synergistic effect of a double bionic structure and enhanced photocatalysis, the effective inhibition on attachment of various organisms is realized, and the inhibition rate on attachment organisms such as algae, bacteria and barnacles reaches 75% or above.

The invention relates to the technical field of organic synthesis, in particular to a preparation method of 1, 3-divinyl-1, 1, 3, 3-tetramethyldisiloxane. The preparation method comprises the following steps: S1, acetylene and dimethylchlorosilane are subjected to a hydrosilylation reaction under the action of a platinum monatomic catalyst, and a mixture is obtained; s2, pressurizing the mixture to 0.1-0.2 MPa, and condensing through a condenser; s3, the gas phase is recycled, and the liquid phase part is subjected to rectification separation to obtain vinyl dimethyl chlorosilane; s4, carrying out countercurrent reaction on the vinyl dimethyl chlorosilane and water, so as to generate a 1, 3-divinyl-1, 1, 3, 3-tetramethyldisiloxane crude product and hydrochloric acid; and S5, rectifying the crude product to obtain a pure product. The invention provides the preparation method of the 1, 3-divinyl-1, 1, 3, 3-tetramethyldisiloxane, which is high in atom economy and simple and convenient to operate, and meanwhile, the requirements of high selectivity, low environmental load and low cost are met.

The present invention belongs to the field of coating technology, specifically relating to an insulating antifouling coating and its preparation method. This invention utilizes a fluorenyl-containing diamine and a fluorine-containing dianhydride as raw materials for an imidization reaction, followed by a condensation reaction with trimethoxychlorosilane to produce a modified polyimide resin. This modified polyimide resin is then combined with mica powder, carbon black pigment, magnesium hydroxide, and other raw materials to produce the insulating antifouling coating. This coating effectively improves the material's volume resistivity while maintaining excellent anti-fouling flashover performance.

The invention discloses a method and device for continuously preparing lithium difluoro (oxalato) borate and a lithium difluoro (oxalato) borate solution, and belongs to the technical field of electrolyte salt synthesis, the method comprises the following steps: continuously pumping chlorosilane and a first mixed solution formed by oxalate and an ester solvent into a first dynamic microchannel reactor, and carrying out a first reaction to obtain a reaction product, wherein the mass flow ratio of the first mixed solution to the chlorosilane is (4-10): 1; continuously pumping the reaction product into a second dynamic micro-channel reactor, continuously pumping a second mixed solution formed by lithium tetrafluoroborate and an ester solvent into the second dynamic micro-channel reactor, and carrying out a second reaction at a temperature of 20-70 DEG C and a rotating speed of 200-400 r / min to obtain a mixed reaction solution; and separating a reaction product in the mixed reaction liquid to obtain the lithium bis (fluoro) oxalato borate. According to the method for continuously preparing the lithium difluoro (oxalato) borate, the continuous production of the lithium difluoro (oxalato) borate can be realized, and the quality of the lithium difluoro (oxalato) borate is high.

The invention discloses a multistage separation method of oil in dimethyl dichlorosilane hydrolysis byproduct acid, which is used for removing organic oil impurities in dimethyl dichlorosilane hydrolysis byproduct hydrochloric acid, and comprises the following steps: S1, static pre-separation: introducing the dimethyl dichlorosilane hydrolysis byproduct hydrochloric acid to be treated into a static settling tank; most easily separated oil drops in the byproduct hydrochloric acid are removed; s2, introducing the byproduct hydrochloric acid treated in the step S1 into a high-shear device, adding a polymer demulsifier, and stirring to promote oil drop coalescence; s3, deeply filtering the demulsified acid liquor by adopting a strong acid-resistant, temperature-resistant and anti-pollution ceramic membrane, and intercepting fine oil drops; and S4, introducing the byproduct hydrochloric acid filtered in the S3 into an activated carbon adsorption column, and adsorbing residual trace soluble organic matters and pigments. Compared with the prior art, the multi-stage separation method for the oil in the dimethyl dichlorosilane hydrolysis byproduct acid has the advantages of being convenient to operate and use, efficient, low in cost and environmentally friendly.

The invention provides a preparation method of a cyano chlorosilane compound, and the preparation method of the cyano chlorosilane compound comprises the following steps: reacting methyl dichlorosilane with a cyano-containing olefin compound under the action of a catalyst to obtain the cyano chlorosilane compound, the catalyst comprises a combination of cuprous salt, organic alkali and tetramethylethylenediamine. According to the method, methyl dichlorosilane and cyano-containing olefin are used as raw materials to react, and the cyano chlorosilane compound is prepared under the action of a specific catalyst; the preparation method is simple in reaction operation, the yield is 76% or above, the purity is 99.1% or above, and the preparation method is suitable for industrial production.

The invention provides a photovoltaic glass surface self-cleaning coating and a preparation method thereof.The photovoltaic glass surface self-cleaning coating is prepared from a dehydrated organic solvent, 1-7 parts by mass of tetramethyl orthosilicate, 2-15 parts by mass of fluorosilane hydrophobic coupling agent, 10-20 parts by mass of silicon tetrachloride, 1-10 parts by mass of hydrophobic silane coupling agent, 5-15 parts by mass of dichloro (methyl) (3, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5- and 1-10 parts of 2, 3, 3-trifluoropropyl) silane and 1-10 parts of dimethyl dichlorosilane. According to the preparation method, tetramethyl silicate with relatively low reaction activity is used as a raw material to react with silicon tetrachloride to form an intermediate species with moderate activity, and then a linear chain polymer modification layer is pre-formed on the surface by utilizing the difference of reaction rates; a fluorosilane substance added in the coating also can participate in the reaction to form an organic silicon linear polymer with a fluorosilane side chain; in the recombination process of polysiloxane, perfluoro side chains with lower surface energy migrate to the surface of the coating; meanwhile, by adding the dichlorosilane coupling agent and the trichlorosilane coupling agent, the flexibility and hydrophobicity of the coating are improved.

The invention provides a method and a system for recycling polycrystalline silicon slag slurry. The recycling method of the polycrystalline silicon slag slurry comprises the following steps: carrying out aluminum removal treatment and titanium removal treatment on a high-boiling-point substance generated by slag slurry treatment to obtain an intermediate high-boiling-point substance; carrying out cracking reaction on the intermediate high-boiling residue and hydrogen chloride to obtain a cracking product and residual liquid; carrying out rectification treatment on the cracking product to obtain gas-phase chlorosilane and a low-boiling-point substance; carrying out concentration treatment on the residual liquid to obtain gas-phase chlorosilane and a concentrated product; and carrying out first hydrolysis treatment on the concentrated product to obtain hydrogen and waste liquid. According to the method for recovering the polycrystalline silicon slag slurry, the high-boiling residues in the polycrystalline silicon slag slurry can be efficiently recovered, and the resource utilization rate is increased.

The present invention relates to the technical field of polyurethane hydrophobic materials, and discloses a preparation method and application of a hydrophobically modified polyurethane nanocomposite material, comprising the following steps: (1) mixing polytetrahydrofuran, polypropylene glycol, and isophorone diisocyanate for reaction; (2) adding dihydroxy-terminated polydimethylsiloxane or glycerol monostearate to the reaction solution for reaction, then adding a chain extender for reaction, and adding triethylamine for neutralization to obtain a modified waterborne polyurethane emulsion; (3) adding SiO2 powder to octadecyltrichlorosilane for reaction to obtain hydrophobic SiO2 powder; (4) adding the hydrophobic SiO2 powder to ethyl acetate to obtain a first mixed solution; adding the modified waterborne polyurethane emulsion to ethyl acetate to obtain a second mixed solution; and adding the first mixed solution to the second mixed solution to obtain a hydrophobically modified polyurethane nanocomposite material. The present invention combines modified waterborne polyurethane with nano-SiO2 to achieve good hydrophobicity and durability.

The application relates to the technical field of finishing agents, and discloses a water-based fluorine-free low-temperature water-repellent finishing agent and a preparation method and application thereof. 2,2-dimethylol propionic acid alkyl ester and methyl phenyl dichlorosilane are reacted to obtain an alkyl ester siloxane copolymer, which is then stirred and dispersed with water and an emulsifier to obtain the water-based fluorine-free low-temperature water-repellent finishing agent. The main chain of the water-based fluorine-free low-temperature water-repellent finishing agent is a hydrophobic phenyl polysiloxane molecular chain, and the side chain contains hydrophobic ester groups and long carbon chains. After finishing of terylene fabric, water molecules can be prevented from contacting the terylene surface, and the hydrophobic and water-repellent performance of the terylene fabric is significantly improved. Moreover, a high water contact angle can be maintained after multiple washes.

Hydrosilylative crosslinking compositions containing an aliphatically unsaturated compound which is the reaction product of an alkali metal siliconate and a chlorosilane and a coupler having two silicon bond hydrogen atoms have high compression and damping characteristics when cured.

The invention discloses a method for preparing methyltriacetoxysilane from acetic anhydride-containing acetyl chloride distillation tailings, and relates to the technical field of organic silicon synthesis, the method comprises the following steps: adding methyl trichlorosilane and acetic anhydride-containing acetyl chloride distillation tailings into a reaction kettle, stirring and heating; after a total reflux condition is reached, maintaining total reflux for a period of time, and then starting to collect acetyl chloride; continuously heating until the collection of acetyl chloride is completed, stopping heating, and when the temperature of the kettle is reduced to room temperature, heating again and starting vacuum negative pressure; when the kettle temperature reaches a set value, stopping heating, stopping stirring, and closing vacuum negative pressure; and after the kettle temperature is reduced to room temperature, adding pretreated activated carbon, carrying out decoloration reaction, and carrying out suction filtration after the reaction is completed, thereby obtaining the product. According to the method, a large amount of acetic anhydride in the acetyl chloride distillation tailings is used as a raw material and directly reacts with methyl trichlorosilane to prepare methyltriacetoxysilane, and the quality of the obtained product is remarkably higher than that of a product prepared by a normal process.

The application relates to a method for synthesizing and refining electronic-grade hexachloroethyldisilane, and specifically, trichlorosilane raw material is mixed with protective gas into a raw material buffer tank, a mixed gas obtained through the mixing is subjected to a catalytic synthesis reaction under the irradiation of an ultraviolet light source, a product obtained through the reaction is subjected to condensation separation, gaseous trichloromethane returns to the raw material buffer tank to continuously participate in the synthesis reaction, the mixed liquid in the cold trap is warmed and vaporized, hexachloroethyldisilane is obtained through two-step refining, and the purity of the product hexachloroethyldisilane can reach the electronic grade. The application takes trichlorosilane as the initial raw material, the price of the raw material is low; the photo-catalysis is used as the synthesis process, the synthesis process is simple, the reaction yield is high, energy is saved, and the environment is protected; the two-step method is used for refining and purifying the product, the depth of the refining and the efficiency of the refining are high, large-scale production is suitable, the monopoly of foreign enterprises is broken, and the application has important significance.

The present 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 components of the composite material are: 50-60wt% of alkali-free glass fiber, 2.2-3.5wt% of a high-gloss compatibilizer, 3.5-5wt% of a toughening agent, 0.15-0.2wt% of an antioxidant, and 0.6-0.9wt% of a processing aid, with the remainder being nylon 66 resin; the high-gloss compatibilizer is substituted by n-alkyl alcohol and vinyl trichlorosilane to form intermediate 1, and then intermediate 2 is prepared by initiating addition of methyl thioglycolate and the unsaturated double bond of intermediate 1, and finally amine transesterification is carried out by γ-aminopropyl triethoxysilane and the terminal methyl ester of intermediate 2; the high-gloss compatibilizer effectively reduces the high-crystalline region-low-crystalline region interface content in the composite system, reduces the scattering of light, and thus allows the composite material to maintain a higher gloss.

This invention relates to the field of organosilicon compound synthesis technology, specifically to a method for preparing pentaphenyltrimethyltrisiloxane and its application. The preparation method includes: S1, mixing diphenylmethylchlorosilane and methylphenyldichlorosilane for co-hydrolysis to obtain an intermediate raw material; S2, adding a catalyst to the intermediate raw material under vacuum to carry out a catalytic polymerization reaction to obtain a polymer product; S3, vacuum distilling and extracting the target component from the polymer product obtained in step S2 to obtain pentaphenyltrimethyltrisiloxane. The preparation method of this invention, by adjusting the raw material ratio, selecting a suitable catalyst, controlling its dosage, limiting the polymerization process parameters, and precisely controlling the distillation separation conditions, achieves a product purity of over 99% and a refractive index stable between 1.5765 and 1.5790, while also improving industrial production efficiency and meeting the product quality requirements of high-end fields.

The application relates to the technical field of organic silicon synthesis, and particularly discloses a high-selectivity platinum catalyst and a vinyl double-seal head synthesis method. The high-selectivity platinum catalyst comprises a carrier and a platinum active component loaded on the carrier, the platinum active component is obtained by reducing and activating a platinum precursor and a ligand under a hydrogen atmosphere at 250-350 DEG C after coordination modification, and the molar ratio of the ligand to the platinum element in the platinum precursor is 2-3:1. In the application, the platinum active component is obtained by reducing and activating the platinum precursor and the ligand after coordination modification, and the ligand and the platinum element form a specific coordination structure of the platinum active center, guide the direct silicon-hydrogen addition reaction of acetylene and a hydrogen-containing double-seal head, thus the dimethyl chlorosilane intermediate is not needed, the process flow is simplified, and the effects of improving the reaction yield, environmental protection and process economy are achieved.

The invention relates to a method and a system for improving SiC bulk doping yield based on retention boundary layer design, and relates to the technical field of semiconductor material preparation, chemical vapor deposition treatment is carried out on gas-phase raw materials on the surface of a substrate, and the gas-phase raw materials are gaseous methyl trichlorosilane, hydrogen, nitrogen and helium; the method comprises the following steps: collecting the flow rate and chemical vapor deposition processing parameters of a gas-phase raw material in real time, controlling the volume flow ratio of hydrogen to gaseous methyl trichlorosilane to be 3-15, and calculating the thickness of a retention boundary layer of the gas-phase raw material according to the flow rate and chemical vapor deposition processing parameters of the gas-phase raw material, the thickness of the retention boundary layer of the gas-phase raw material is compared with the preset thickness of the retention boundary layer, the flow velocity of the gas-phase raw material and / or chemical vapor deposition processing parameters are / is adjusted according to the comparison result, and the SiC block material prepared through the method is compact and free of pores or free carbon or silicon carbide nanowires, and the adjustable range of the resistivity is wide.