58 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 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 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.

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 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 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 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 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.

The utility model provides a dimethyl dichlorosilane hydrolysis hydrogen chloride treatment device for high-pressure chloromethane synthesis, which is characterized in that a top outlet of a hydrogen chloride gas washing tower is connected with an inlet of a gas-liquid separation tank through a pipeline, a top outlet of the gas-liquid separation tank is connected with a hydrogen chloride cooler, and the hydrogen chloride cooler is connected with a demister; the demister is connected with the purification tower through the hydrogen chloride preheater, the top of the purification tower is connected with the compressor buffer tank, and the compressor buffer tank is connected with the hydrogen chloride compressor. The dried hydrogen chloride gas is conveyed to a demister, mist particles with the diameter larger than 1 micron are directly intercepted by utilizing an adsorption medium of an internal FRP + glass fiber mixed material, mist particles with the diameter smaller than 1 micron are adsorbed and fixed, sulfuric acid mist carried by the hydrogen chloride gas can be removed, finally, the purified hydrogen chloride gas is compressed, and pure hydrogen chloride gas with the pressure of 0.2-0.4 MPa is obtained. And a guarantee is provided for a co-production chloromethane synthesis process.

The present application belongs to the field of dimethyldichlorosilane concentrated acid hydrolysis reaction in the organic silicon industry, and particularly relates to a dimethyldichlorosilane concentrated acid two-stage hydrolysis reaction process. The process comprises the following specific steps: dimethyldichlorosilane is subjected to a first-stage hydrolysis reaction with recycled saturated hydrochloric acid and water, and an additive is added; purification and drying are performed, and the purified siloxane is subjected to a second-stage reaction in a second-stage reactor; after the second-stage reaction is completed, the mixture is subjected to oil-water separation, and the hydrolyzate is subjected to a washing section to obtain a final product. The dimethyldichlorosilane provided by the present application is subjected to two-stage hydrolysis reaction, the content of chlorine-terminated groups in the generated hydrolyzate is greatly reduced, the acid content is low, and the quality of the hydrolysis product is high. The new process provided by the present application adopts a two-stage reaction system, solves the problems of high chlorine-terminated group content, hydrogen chloride gas containing dimethyl and hydrolyzate, and obtains high-quality hydrolyzate, and the reaction system maintains a slight positive pressure, which does not inhibit the dimethyl hydrolysis reaction.

This invention relates to a novel process for manufacturing a SiC-coated body by depositing silicon carbide (SiC) on a graphite substrate using dimethyldichlorosilane (DMS) as a silane source in a chemical vapor deposition method. Another aspect of the invention relates to novel SiC-coated bodies obtainable through the novel process of this invention, and to their use in manufacturing articles for high-temperature applications, substrates and reactors, semiconductor materials, and wafers.

The invention provides a preparation method of an AG glass anti-dazzle coating based on a nano microstructure, and relates to the technical field of anti-dazzle coating preparation.The preparation method of the coating comprises the following steps that a coating A, a coating C and a coating B are sprayed on AG glass in a layered mode, so that a layered anti-dazzle coating structure is formed, modified nano silicon dioxide is added into the coating B, and the anti-dazzle coating is obtained. According to the present invention, the anti-glare paint film is obtained by using the dimethyldichlorosilane as the modifier to modify the nano-silica, such that the good matting effect is generated on the basis of the assurance of the glossiness of the paint film, and the basic nano-scale concave-convex structure is constructed between the layers so as to ensure the core anti-glare ability on the basis of the adhesion effect after the anti-glare paint is coated; and visual fatigue caused by direct strong light is avoided.

The present application relates to the process and system for reducing the acid value of dimethyldichlorosilane hydrolysate in the separation and washing process. The three-stage coalescer is arranged, the acidic hydrolysate of dimethyldichlorosilane enters the system from the first-stage coalescer, the process water enters the system from the third-stage coalescer, the acidic hydrolysate is mixed with dilute hydrochloric acid or process water in each coalescer, the oil-water two-phase separation is completed through multiple washing and coalescing, and the acid value of the hydrolysate is reduced; each coalescer comprises two series static mixers, a group of pre-filters, and a large coalescer, the coalescer is in the shape of Z, and each coalescer contains four filter cores. Through repeated tests, the modified polyvinylidene fluoride filter core of Dowell is finally selected, and after the continuous three-stage coalescer treatment, the acid value of the dimethyldichlorosilane hydrolysate can be reduced to below 10 PPM.

The invention relates to a high-performance organic silicon packaging adhesive for a photovoltaic module, the packaging adhesive is an organic high-molecular compound taking a silicon-oxygen bond as a main chain, and a colloidal elastomer is formed after the packaging adhesive is cured; the working temperature range of the packaging adhesive is-55 DEG C to 250 DEG C, the light transmittance of the packaging adhesive in a visible light range is not lower than 92%, and after the packaging adhesive is aged for 1000 hours under the double-85 test conditions of 85 DEG C and 85% relative humidity, the light transmittance retention rate is larger than 95%; the packaging adhesive is prepared from a monomer mixture containing dimethyl dichlorosilane and methyl trichlorosilane through high-temperature reaction, hydrolysis and condensation processes under the action of a composite catalytic system of copper and various high polymer materials, and finally a network polymer with linear and cross-linked structures is formed. The core purpose of the invention is to provide a revolutionary photovoltaic packaging material which is high in light transmittance, extremely stable in chemical property, capable of greatly improving the reliability, the service life and the power generation efficiency of a component, and environment-friendly and recoverable.

The invention relates to the field of by-product treatment in organic silicon chemical production, and discloses a multistage separation method of oil in dimethyl dichlorosilane hydrolysis by-product acid. Comprising the following steps: S1, demulsification pretreatment: adding a demulsifier formed by compounding a specific cationic polymer and a nano inorganic material into hydrochloric acid of acid-containing oil which is a dimethyl dichlorosilane hydrolysis byproduct, and simultaneously applying ultrasonic treatment; s2, primary centrifugal separation: carrying out centrifugal separation on the mixed solution treated in the step S1 through a disc separator, and preliminarily separating an oil phase and an acid phase; and S3, secondary membrane separation: carrying out membrane separation on the acid phase obtained in the step S2 through a hydrophobic polymer hollow fiber membrane assembly. Compared with the prior art, the method has the advantages that by integrating innovative pretreatment, gradient separation and intelligent control technologies, efficient removal of oil in acid, high-quality recycling of hydrochloric acid and effective recovery of oil phase resources are achieved.

The invention relates to the technical field of organic silicon chemical industry, and discloses a method for preparing an organic silicon monomer from low-grade silicon powder based on element regulation and control, which comprises the following steps: step 1, pretreating the low-grade silicon powder: crushing the low-grade silicon powder, adding a pretreating agent, reacting for 2-3 hours at the temperature of 60-80 DEG C and the stirring speed of 200-300r / min, and then filtering, washing and drying to obtain pretreated silicon powder; step 2, preparation of the element regulating agent: mixing the main regulating agent and the auxiliary regulating agent according to the mass ratio of (5-7): 1, adding the dispersing agent, and dispersing at the rotating speed of 3000-5000r / min for 30-40 minutes to obtain the element regulating agent. Compared with the prior art, the method has the advantages that harmful impurities are effectively removed by performing targeted pretreatment and element regulation on the low-grade silicon powder, and beneficial catalytic components are introduced, so that high-efficiency and high-selectivity utilization of the low-grade silicon powder is realized, and the high-content dimethyldichlorosilane monomer is prepared.

The invention provides a preparation method of hydrophobic nano silicon dioxide, which comprises the following steps: introducing dimethyl dichlorosilane gas and methyl trichlorosilane gas into hydrophilic nano silicon dioxide, and reacting at 250-400 DEG C to generate the hydrophobic nano silicon dioxide. The preparation method comprises the following steps: directly introducing dimethyl dichlorosilane and methyl trichlorosilane into hydrophilic nano silicon dioxide at the temperature of 250-400 DEG C in the form of gas, and directly reacting the dimethyl dichlorosilane and the methyl trichlorosilane at high temperature to obtain the hydrophobic nano silicon dioxide. Monomethyl trichlorosilane is taken as a main hydrophobic raw material, so that the production cost can be remarkably reduced, and in order to improve the yield of hydrophobic nano silicon dioxide obtained by monomethyl trichlorosilane and hydrophilic nano silicon dioxide, dimethyldichlorosilane gas is also used, so that the yield of the hydrophobic nano silicon dioxide is improved. The two gases jointly promote the mutual reaction with the hydrophilic nano silicon dioxide, so that low-cost and high-efficiency preparation of the hydrophobic nano silicon dioxide is realized.

The invention discloses a method for preparing hydroxyl silicone oil by using a micro-channel reactor, which comprises the following steps: respectively pumping dimethyldichlorosilane and a hydrolysis medium into the micro-channel reactor by a plunger pump to carry out primary hydrolysis reaction, and adjusting the reaction pressure in the first micro-channel reactor by a back pressure valve; separating an oil-water mixture after the reaction into a hydrolysate and a water-phase medium containing ammonium chloride through a phase separator; 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 loss of dropwise added feed 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, the safe production of the hydroxyl silicone oil is realized, and the production cost is reduced. The method has the advantages of high efficiency, energy conservation, easiness in control, few three wastes and the like.