102 results about "Dimethyldichlorosilane" patented technology

The utility model relates to a system for reducing the acid value of hydrolysate in the separation and washing process of dimethyl dichlorosilane hydrolysate. Comprising three stages of coalescers, dimethyl dichlorosilane acidic hydrolysate enters the system from the first stage of coalescer, process water enters the system from the third stage of coalescer, the acidic hydrolysate and diluted hydrochloric acid or process water are mixed in each stage of coalescer, oil-water two-phase separation is completed through multiple times of washing and coalescence, and meanwhile the acid value of the hydrolysate is reduced; each stage of coalescer comprises two static mixers connected in series, a group of prefilters and a large coalescer, the coalescer is Z-shaped, and four stages of filter elements are arranged in each stage of coalescer. Through repeated tests, a modified polyvinylidene fluoride filter element of Pall Company is finally selected, and after continuous three-stage coalescer treatment, the acid value of dimethyldichlorosilane hydrolysate can be reduced to 10 PPM or below.

The invention discloses a high-strength liquid silicone rubber composition and a preparation method thereof. The rubber composition comprises the following raw material components in parts by weight: 100.0 parts of vinyl-terminated silicone oil; 30.0 parts to 45.0 parts of modified white carbon black; 1.0 to 5.0 parts of modified nano titanium dioxide; 14.0 parts to 26.0 parts of aluminum hydroxide; 7.0 parts to 9.0 parts of hydrogen-containing silicone oil; 1.0 part to 5.0 parts of a silane coupling agent; 0.2 to 0.5 part of a catalyst; wherein the modified white carbon black is prepared by modifying white carbon black prepared by a vapor phase method through dimethyldichlorosilane or trimethylchlorosilane, and the modified nano titanium dioxide is prepared by modifying through a surface silicon deposition method; the particle size of the white carbon black prepared by the gas phase method is 5-50 nm, and the BET specific surface area of the white carbon black prepared by the gas phase method is 300-400 m < 2 > / g. The strength of the product is improved by adding the inorganic filler, and the nano titanium dioxide is modified by a surface silicon deposition method, so that the surface energy of the nano titanium dioxide is remarkably improved, and the dispersity and fluidity of the liquid silicone rubber are improved.

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 method for preparing industrial silicon powder for organic silicon monomer synthesis from high-calcium industrial silicon melt, and belongs to the technical field of industrial silicon production. Based on the practical problems that the content of CaSi2 in an industrial silicon product is high due to the fact that the content of Ca impurities in the melt is too high after the silicon melt is subjected to external refining, and the selectivity of dimethyldichlorosilane is low when the industrial silicon is used as a raw material to synthesize an organic silicon monomer, the method comprises the following steps: obtaining the content of main metal impurities in the high-calcium silicon melt after the silicon melt is subjected to external refining; the preparation method comprises the following steps: quantitatively adding an alloying agent Al to adjust the components of a silicon melt, carrying out heat preservation and refining, pouring, and controlling the solidification rate of the silicon melt, so that a large amount of beneficial Si8Al6Fe4Ca and Si2Al2Ca phases are formed, and meanwhile, the precipitation of a harmful inclusion phase CaSi2 is avoided, and the industrial silicon powder for synthesizing the organic silicon monomer is prepared, so that the selectivity and activity of the synthesis process of the organic silicon monomer are improved.

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 provides a preparation method of hydroxyl silicone oil with high hydroxyl content, which comprises the following steps: by taking dimethyldichlorosilane as a raw material, carrying out hydrolysis reaction in a hydrolysis medium to obtain an oil-water mixture; performing oil-water separation on the oil-water mixture to obtain crude hydroxyl silicone oil; and performing deamination and impurity removal on the crude hydroxyl silicone oil to obtain the finished product hydroxyl silicone oil with high hydroxyl content. According to the technical scheme, the hydroxyl silicone oil with the high hydroxyl content of 8-14% and the viscosity of 25-40 cp is obtained. The field of products of high-hydroxyl-content hydroxyl silicone oil in the field is filled.

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 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 relates to high-heat-resistance polypropylene and a preparation method thereof, and belongs to the technical field of high polymer materials. The preparation method comprises the following steps: carrying out Michael addition reaction on 2-sulfydryl-1, 3-propylene glycol and vinyl dibutyl borate to prepare dihydric alcohol containing thioether and phosphate, and carrying out polymerization reaction on 1, 12-dodecanediol, boric acid ester dihydric alcohol and dimethyldichlorosilane to obtain the flame retardant. A polymer containing a borate group, a thioether group, organic silicon and a dodecane glycol ester group is prepared, the polymer is used as a heat-resistant toughening additive of polypropylene, the borate group and the organic silicon can improve the heat resistance and flame retardance of the polypropylene, and the thioether group and the dodecane glycol ester group can provide flexibility; therefore, the polypropylene is ensured to have good mechanical strength, heat resistance and flame retardance at the same time.

This invention relates to a method for strengthening the formation of Si8Al6Fe4Ca from industrial silicon melt through stepped solidification, belonging to the technical field of high-value utilization of industrial silicon. Addressing the practical problems of uncontrollable solidification rate, incomplete intermetallic compound transformation, and random precipitation of intermetallic compounds in the air-cooling casting process of industrial silicon melt, as well as low selectivity and primary conversion rate of dimethyldichlorosilane when synthesizing organosilicon monomers using industrial silicon as raw material, this invention casts the oxidized and refined silicon melt into a mold with controllable cooling. Through optimization of solidification process parameters, stepped variable-rate solidification is achieved to reduce the content of harmful FeSi2 / CaSi2 phases in industrial silicon products and promote the full conversion of harmful phases to Si8Al6Fe4Ca, Si2Al2Ca, and Si2Al3Fe. This invention has the advantages of fully utilizing and saving energy, low infrastructure investment, simple process flow, high operability, and no environmental pollution.

The invention relates to the technical field of organic silicon leather, in particular to PET organic silicon leather and a production process. The PET organic silicon leather comprises a PET substrate, an organic silicon adhesive and liquid silica gel; the organic silicon adhesive is prepared from the following components in parts by weight: 5 to 10 parts of hydrogen-containing polysiloxane, 3 to 8 parts of vinyl polysiloxane, 2 to 5 parts of dimethyl dichlorosilane, 1 to 3 parts of cyclosiloxane and 0.2 to 0.5 part of a platinum catalyst. The liquid silica gel is prepared from the following components in parts by weight: 5 to 10 parts of a silica polymer consisting of disiloxane, 5 to 10 parts of polyether modified polydimethylsiloxane, 3 to 5 parts of polysiloxane, 2 to 6 parts of triethoxysilane, 0.1 to 0.4 part of a low-boiling-point mixture, 0.08 to 0.16 part of a platinum vulcanizing agent, 0.002 to 0.005 part of a tackifier, 0.002 to 0.005 part of an antistatic agent, 0.01 to 0.03 part of fluff powder, 0.008 to 0.01 part of extinction powder and 0.002 to 0.005 part of a dispersing agent. The PET organic silicon leather provided by the invention is a leather product composed of PET as a substrate and silica gel as a surface layer, and can pass 100 DEG C water boiling for one hundred hours, aging resistance and various environmental protection tests.

This invention discloses a modified polysilazane, a two-component silicone sealant, and a method for preparing the same. The modified polysilazane is prepared through a nucleophilic substitution reaction of dimethyldichlorosilane, vinyltrichlorosilane, and ethylenediamine. The two-component silicone sealant prepared using the modified polysilazane of this invention significantly improves its hardness under sealed conditions without adversely affecting its curing and performance. Furthermore, it requires a small amount and is highly practical. The two-component silicone sealant prepared using the modified polysilazane of this invention exhibits high hardness retention under sealed conditions, significantly slows down the reversion phenomenon, and maintains good mechanical properties and adhesion even after curing at 90°C under sealed conditions. It also demonstrates excellent resistance to reversion under fully sealed conditions.

The invention provides a method for judging a termination point of preparation reaction of 107 silicone rubber based on current of a stirring motor. The preparation method of the 107 silicone rubber comprises the following steps: polymerizing dimethyldichlorosilane hydrolysate under the action of a catalyst, monitoring current change on line, reaching a preset value, terminating the reaction, and performing post-treatment to obtain the 107 silicone rubber. When the 107 silicone rubber is synthesized, the reaction endpoint is determined by adopting a current method, and the influence of external factors on the judgment of the reaction endpoint is reduced by monitoring the current change in the reaction process in real time, so that the preparation reaction endpoint of the 107 silicone rubber is accurately judged, and the accurate control on the reaction process is realized.

The invention provides a preparation method of a modified binder, which comprises the following steps: firstly, synthesizing dimethyl silicon polyvinyl ester by taking polyvinyl alcohol and dimethyl dichlorosilane as raw materials, and then adding the synthesized dimethyl silicon polyvinyl ester into an organic binder for compounding to obtain the modified binder. The modified binder has higher heat resistance, flame retardance and waterproofness, can be applied to scenes with higher performance requirements on the binder, especially some scenes in which a welding technology cannot be used, such as underwater repair, an oil bin of a transport ship, a natural gas bin and the like, and the repair cost is reduced; the method can be used for a pipeline system and simplifies the repair process. The preparation method of the modified binder is green, environment-friendly and low in cost.

The invention discloses finishing paint phenolic aldehyde modified organic silicon resin for a windshield on a lighter and a preparation method of the finishing paint phenolic aldehyde modified organic silicon resin. The water-based paint is prepared from the following raw materials: methyl trichlorosilane, dimethyl dichlorosilane, phenyl trichlorosilane, diphenyl dichlorosilane, methylbenzene, dimethylbenzene, acetone, propylene glycol methyl ether acetate, ethylene glycol monoethyl ether acetate, n-butyl alcohol, ionized water, tap water, phenol, cardanol, 37% formaldehyde, methanol, benzyl alcohol, citric acid, oxalic acid, triethylamine and the like. According to the preparation method disclosed by the invention, the optimal methyl proportion and solvent system are screened out through a large number of contrast experiments, and the phenolic aldehyde modified organic silicon resin is prepared by adopting a hydrolysis method and a condensation method. The coating has the comprehensive properties of no smoking in high-temperature decomposition, flame retardancy, high bonding strength, lasting antifouling property, corrosion resistance, high temperature resistance, high chemical resistance, high adhesive force and good impact property.

The invention relates to a method for forming Si8Al6Fe4Ca through stepped solidification reinforcement of industrial silicon melt, and belongs to the technical field of high-value utilization of industrial silicon. Aiming at the practical problems of uncontrollable solidification speed, incomplete conversion of intermetallic compounds, randomization of precipitation of the intermetallic compounds, low selectivity and primary conversion rate of dimethyldichlorosilane when the industrial silicon is used as a raw material to synthesize an organic silicon monomer in an industrial silicon melt casting air cooling process, the invention provides a preparation method of the organosilicone monomer. According to the method disclosed by the invention, the silicon melt subjected to oxidation refining is cast into a casting mold with controllable cooling, and stepped variable-rate condensation is realized through parameter optimization in a solidification process, so that the content of harmful FeSi2 / CaSi2 phases formed in industrial silicon products is reduced, and full conversion of the harmful phases to Si8Al6Fe4Ca, Si2Al2Ca and Si2Al3Fe is promoted. The method has the advantages of full utilization and energy conservation, low capital construction investment, simple process flow, high operability, no environmental pollution and the like.

The present invention discloses a high-boiling silicone oil and its preparation method and application, which belongs to the field of high-boiling organosilicon products. The preparation method of the high-boiling silicone oil provided by the present invention comprises the following steps: (1) mixing a high-boiling organosilicon product, a high-boiling organosilicon product treatment agent and water for reaction, adding an alkaline neutralizing agent for neutralization to obtain an intermediate product; the boiling point of the high-boiling organosilicon product is above 180°C; the high-boiling organosilicon product treatment agent comprises at least one of trimethylchlorosilane, dimethyldichlorosilane or ethanol; (2) adding an alkali metal alcohol salt to the intermediate product obtained in step (1), mixing and reacting, then adding an acidic neutralizing agent for neutralization, removing low-boiling products with a boiling point below 150°C, and obtaining the high-boiling silicone oil. The high-boiling silicone oil prepared by the present invention has the characteristics of low volatility, low acid value, and is not easy to return to acid, and has excellent insulation performance. It can be used as a diluent for sealants and lubricating oil for electronic appliances.

An on-line moisture detection device for dimethyl dichlorosilane hydrolysis hydrogen chloride comprises a gas conveying pipeline, a cooler, a dryer and a compressor are sequentially arranged on the gas conveying pipeline in the conveying direction, a gas inlet branch pipe is arranged on the gas conveying pipeline between the cooler and the dryer and connected to a moisture detection mechanism, and the moisture detection mechanism is connected with the compressor. And the gas conveying pipeline between the dryer and the compressor is provided with another gas inlet branch pipe, and the gas inlet branch pipe is connected to another moisture detection mechanism. By adopting the structure, the moisture content of the product hydrogen chloride can be monitored and processed in real time, the moisture content in the product hydrogen chloride is effectively controlled, and the compressor is prevented from being damaged.

The invention discloses a method for removing a chlorine carbon compound and an olefin compound in a chlorosilane crude monomer. The method comprises the following steps: (1) catalyst activation reaction; (2) reforming reaction: continuously introducing a dimethyldichlorosilane crude monomer with the temperature of 120 DEG C from a top feed port of the reaction tower at the flow speed of 30-45m < 3 > / h; and reacting in a reaction tower with the temperature of 105-120 DEG C and the pressure of 640-660Kpa, and continuously discharging the crude monomer in the reaction tower from a discharge port at the bottom of the reaction tower at the flow speed of 30-45m < 3 > / h to obtain the crude monomer without the chlorine carbon compound and the olefin compound. The method for removing the chlorine carbon compound and the olefin compound in the chlorosilane crude monomer has the beneficial effects that the chlorine carbon compound and the olefin compound are effectively removed, so that the quality of M2 is improved, impurities entrained to the downstream are reduced, and the quality of a downstream product is improved.

The invention discloses a nano titanium dioxide reinforced plastic compatilizer and a preparation process thereof, and belongs to the technical field of high-molecular polymers. The invention is used for solving the technical problems in the prior art that in order to improve various properties between polypropylene and an inorganic material compound, the doped plastic compatilizer has excessive components, resources are wasted, and the environment is not protected. The preparation process of the nano titanium dioxide reinforced plastic compatibilizer comprises the following steps: melting, blending and extruding a multi-paraffin polymer and a grafting monomer to form the nano titanium dioxide reinforced plastic compatibilizer, the multi-paraffin polymer is obtained through reaction of glucosamine lauroyl and dimethyldichlorosilane in an alkaline environment, and the grafting monomer is obtained through reaction of a cyclization compound, nano silicon dioxide dispersion liquid and an EDC-NHS activation system.

The utility model discloses a device for preparing hydroxyl silicone oil by using a micro-channel reactor, which is characterized in that a dimethyldichlorosilane storage tank and a hydrolysis medium storage tank are respectively connected with the micro-channel reactor through a first peristaltic pump and a second peristaltic pump, the discharge end of the micro-channel reactor is connected with a phase separator, and the upper part of the phase separator is connected with a falling film evaporator; the falling film evaporator is connected with the vacuum separator through a pipeline and then is connected with the hydroxyl silicone oil storage tank; by utilizing the excellent mass transfer and heat exchange performance of the micro-channel reactor, not only is the reaction time greatly shortened, but also compared with the traditional kettle reaction, the drop-by-drop feeding loss and the risk that the raw material dimethyldichlorosilane and the hydrolysis medium are subjected to violent hydrolysis reaction to release heat and are easy to spray are reduced, and the production efficiency is improved. And the method has the advantages of high efficiency, energy conservation, easiness in control, few three wastes and the like.

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 present invention discloses a high-ionic conductivity lithium-ion battery separator and a preparation method thereof, relating to the technical field of battery separators. In preparing the high-ionic conductivity lithium-ion battery separator, the present invention comprises the following steps: reacting chitosan porous microspheres with 1,3-propane sultone to produce functionalized chitosan porous microspheres; polycondensing functionalized dimethoxysilane, mercaptopropylmethyldimethoxysilane, and dimethyldichlorosilane to produce functionalized polysiloxane; reacting polypropylene with 1,4-diamino-2-butene to produce pre-modified polypropylene; reacting pre-modified polypropylene with formaldehyde and allyl hypophosphorous acid to produce modified polypropylene; and uniformly mixing the modified polypropylene, functionalized chitosan porous microspheres, functionalized polysiloxane, and azobisisobutyronitrile, and performing melt electrospinning to produce the high-ionic conductivity lithium-ion battery separator. The high-ionic conductivity lithium-ion battery separator prepared by the present invention has excellent ionic conductivity, flame retardancy, and mechanical properties.

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.

The invention discloses a methyl chlorosilane high-boiling residue cracking catalyst as well as a preparation method and a use method thereof, and belongs to the technical field of catalysts. The preparation method specifically comprises the following steps: S1, adding gamma-Al2O3 and 3-aminopropyltrichlorosilane into anhydrous xylene, stirring for a certain time at normal temperature under the protection of nitrogen, heating to a reflux state, carrying out reflux stirring for a certain time, filtering while hot, washing, and carrying out vacuum drying to obtain amino-functionalized gamma-Al2O3; and S2, adding the amino-functionalized gamma-Al2O3 obtained in the step S1 into absolute ethyl alcohol dissolved with AlCl3 and a cocatalyst, stirring for a certain time under the protection of nitrogen and at room temperature, filtering, and drying in vacuum to obtain the AlCl3 catalyst immobilized on the amino-functionalized gamma-Al2O3. The catalyst can be used as a catalyst for preparing dimethyl dichlorosilane through cracking of methyl chlorosilane high-boiling residues, reaction is carried out under the conditions of low temperature and low pressure, and the highest cracking conversion rate of the methyl chlorosilane high-boiling residues can reach 99.4%; and the yield of the dimethyl dichlorosilane can reach up to 88.6%.

The invention discloses high-refraction phenyl silicone oil and a preparation method thereof, and relates to the technical field of organosilicone, the high-refraction phenyl silicone oil comprises the following raw materials: phenyl trichlorosilane, diphenyl dichlorosilane, methyl trichlorosilane, dimethyl dichlorosilane, hexamethyldisiloxane, a catalyst and a solvent; the preparation is performed based on the raw materials. According to the invention, by reasonably regulating and controlling the ratio of the phenyl trichlorosilane to the diphenyl dichlorosilane, premature crosslinking of the system is avoided while high refractive index is maintained; by introducing methyl trichlorosilane and dimethyl dichlorosilane, the flowability and viscosity are accurately adjusted, and the optical performance and the processability are both considered; and hexamethyldisiloxane is added in batches in the condensation stage to form a uniform end sealing structure, so that the high-refraction phenyl silicone oil with narrow molecular weight distribution and stable and controllable refractive index is obtained. The transparency and the thermal stability of the material are improved, and the bivariate accurate matching capability of the refractive index and the viscosity is remarkably improved.

The invention relates to the technical field of thermosetting materials, and discloses a preparation method of benzoxazine and bismaleimide transparent resin alloy, which comprises the following steps: preparing required materials: mixing bismaleimide and benzoxazine according to a certain proportion, adding a proper amount of solvent, and stirring for a period of time to form a uniform mixture; adding a proper amount of cross-linking agent into the mixture, fully stirring, casting a blend solution on a glass plate pretreated with dimethyldichlorosilane, drying at 50 DEG C for 4-6 hours, and then respectively carrying out heat treatment at different temperatures for 1-3 hours to obtain an alloy membrane; and testing the performance of the alloy film. According to the process, bismaleimide and benzoxazine are used as main raw materials, and the transparent bismaleimide resin alloy material with excellent performance is prepared through a specific formula and process steps. The alloy material not only has high transparency and excellent heat resistance, but also has relatively high mechanical strength and chemical stability.

The invention provides a method for preparing methyl chlorosilane by using methyl chlorosilane high-boiling cracking residual liquid. The method comprises the following steps: by taking methyl chlorosilane high-boiling residue cracking raffinate, methyl trichlorosilane and trimethyl chlorosilane as main raw materials and Al2O3-V2O5-WO3 as a catalyst, carrying out cracking disproportionation in a high-pressure reaction kettle under the conditions of heating and pressurizing, and rectifying and separating a reaction product to obtain the dimethyl dichlorosilane. According to the method, the high-value dimethyldichlorosilane can be prepared from the hazardous waste methyl chlorosilane high-boiling cracking residual liquid through the disproportionation reaction, so that cyclic utilization of the high-boiling residue cracking residual liquid is realized, and the problems that the high-boiling residue cracking residual liquid is large in discharge amount, difficult to treat and the like are solved; and through catalysis of Al2O3-V2O5-WO3, the selectivity of dimethyldichlorosilane can be improved, toxic aniline substances carried in high-boiling residue cracking raffinate can be adsorbed, and the problems of environmental pollution and the like are solved.