35 results about "Hexamethyldisilane" patented technology

The invention relates to a synthesis method of cefepime dihydrochloride that is a bacteriophage. 7-amin cethalosporanic acid (7-ACA) is used as starting material and reacts with hexamethyldisilane amine (HMDS) and iodotrimethylsilane (TMSI) first to obtain 7-ACA for protecting amino and carboxyl; then 7-ACA, amino and carboxyl of which are protected, reacts with iodotrimethylsilane and N-methylpyrrolidine to synthesize (6R, 7R)-7-amino-3-((1-methyl-1-pyrrolidine) methyl) cephalosporin-3-alkene-4-carboxylic acid hydrochloride (7-MPCA) through a one-pot method; 7-MPCA reacts with AE active ester to obtain a product of cefepime dihydrochloride through acidylation reaction and salifying reaction. Compared with the existing technical route, the synthesis method has the advantages that the process conditions are simple, the operation is convenient, the product yield is high, the product quality is stable, the method is suitable for the large-scale industrialized production, etc.

A semiconductor device having an insulted silicon nitride layer insulated silicon nitride layer without deteriorating the metal silicide composed conduction layer and its manufacturing method are provided. Form an insulated film 10 mainly comprising uniform carbon-contented silicon nitride film on the metal silicide, for example, nickel silicide conduction layer 9. The carbon contented nitride film is made by reacting the nitrified seed and silicon source. Methyl-contented hexamethyldisilane is adopted as the silicon source, so the nitride film formed through the reaction consists of carbon and hydrogen. Furthermore, if it contains methyl, the film becomes porous, so the dielectric constant is reduced. Therefore, the RC delay-induced transistor speed degradation will be suppressed. By means of carbon-contented silicon nitride film, the metal silicide conduction layer is not deteriorated during process. The silicon source could be amino or free radical of amino having carbide.

The invention belongs to reference electrolyte capable of improving the cycling performance of a lithium-sulfur battery and a preparation method. The reference electrolyte is prepared from an ether type solvent, lithium salt, lithium nitrate and an additive for improving the cycling performance, wherein the ether type solvent is a mixture of two solvents; a first solvent is any one of 1,3-dioxolane and 1,4-dioxane; a second solvent is any one of ethylene glycol dimethyl ether, diethylene glycol dimethyl ether and tetraethylene glycol dimethyl ether; the lithium salt is any one of LiPF6, LiBF4,LiTFSi, LiFSi and LiBOB; the additive for improving the cycling performance is any one of 3-aminopropyltriethoxysilane, hexamethyldisilane and tetraethyl silicate. The reference electrolyte has the advantages that a preparation process is simple, the prices of the solvents and the additive are cheap, and materials are saved; the reference electrolyte can have a good negative electrode lithium protection effect; after lithium-sulfur battery electrolyte is used in the lithium-sulfur battery, the cycling performance and the safety of the lithium-sulfur battery can be remarkably improved.

The invention relates to a low-odor scratch-resistant polypropylene composite material, which is prepared from the following raw materials by mass: 44.6-96.6% of polypropylene, 0-40% of talcum powder,0.4-4% of an antioxidant, 1-5% of a deodorant 1, 1-5% of a deodorant 2 and 1-5% of a scratch-resistant aid, wherein the deodorant 1 is one or a plurality of materials selected from water, hexamethyldisilane, hexamethyldisiloxane, triethylsilanol and octamethyltrisiloxane, and the deodorant 2 is mesoporous silica or a 13X type zeolite molecular sieve loading at least one selected from ethylenediamine tetraacetic acid salt, methylene triamine pentamethylene phosphoric acid, ethylenediamine tetramethylene phosphoric acid and 2,4-dinitrophenylhydrazine. According to the invention, the product hasexcellent low-odor and excellent scratch resistance, reduces the antagonism among odor, diffusivity and scratch resistance, and finally realizes the balance of odor, diffusivity and scratch resistance of the product.

The invention discloses a preparation method for improving metal hydrophobicity based on a vapor deposition method. The method comprises the steps that 1, the surface oxidation control method is utilized for generating an oxidation metal film on the metal surface; and 2, hexamethyldisilane modifies oxidation metal through the vapor deposition method. By using the manufacturing method of super-hydrophobic metal, surface hydrophobicity of the metal is improved correspondingly, the hexamethyldisilane is cheap and low in toxicity compared with chlorine and fluorine containing reagent, and is friendly to environment, thus the metal does not corrode easily in the humid environment, or does not frost or freeze easily at the low temperature, thus heat conduction to the metal is avoided, the influence on electricity conducting performance is avoided, the stability of metal products and devices is improved directly and substantially, and the property of people and social safety are guaranteed.

The present invention discloses a preparation method of an organic silicon material and concretely indicates a preparation method of hexamethyldisilane. The present invention considers one kind of two kinds of dimethylbenzene and trimethylbenzene as solvent, wherein, the dimethylbenzene is preferential; the solvent is put in a reactor under the state without oxygen, metal potassium is put into the solvent, then solution is heated to 60 DEG C to 85 DEG C, furthermore trimethylchlorosilane is added to react for certain time, finally the product can be obtained by normal separation method. The present invention has the advantages of saving energy, short reaction time, high product yield etc. The present invention can be widely applied to almost all national economic fields of the defense and military industry, the aviation and aerospace field, the electronic and electrical field, the building field, the machinery field, the metallurgy, the automobile field, the instrument field, the weaving field, the chemical industry, the light industry, the food field, the medical and health field, the personal health care field etc.

The invention belongs to the field of coating preparation, and particularly relates to a chemical vapor deposition method for preparing a silicon carbide composite coating on monocrystalline silicon or polycrystalline silicon. A metal organic compound chemical vapor deposition (MOCVD) system is adopted, a liquid raw material hexamethyldisilane (HMDS) or hexamethyldisiloxane (HMDSO), H<2> and Ar gas system is selected, the working pressure is 10-1000 Pa, and the temperature is 900-1350 DEG C. Before the coating is deposited, pretreatment is carried out on a monocrystalline silicon or polycrystalline silicon substrate to form a porous silicon layer, then the coating is deposited on the porous silicon layer, and the composite coating sequentially comprises a porous silicon layer, a buffer layer, an SiOC layer and a pure SiC layer from a Si matrix. The silicon carbide composite coating deposited by adopting the method has the advantages of being compact in structure, free of obvious cracks, good in combination with the matrix and the like. According to the composite coating designed by the method, the stress matching problem of the SiC coating and the Si matrix is ingeniously coordinated, and the thickness of the composite coating prepared by adopting the method can exceed 1.5 mm.

The invention provides an iodotrimethylsilane preparation method. The preparation method comprises the following steps that half hexamethyldisilane is put in a reaction flask, a layer of rectifying column packing glass springs is added in a constant pressure dropping funnel, then elementary substance iodine and half hexamethyldisilane are added in the constant pressure dropping funnel, vacuumizing and nitrogen replacing are performed on a reaction system, and all the steps are repeated for three times; stirring is started, the temperature rises to 65 DEG C, and hexamethyldisilane solutions of the iodine are dropwise added; after dropwise adding is finished, the outer temperature rises to 130 DEG C for backflow, and therefore after being cooled, steam enters the constant pressure dropping funnel to dissolve the undissolved iodine in the constant pressure dropping funnel; after the iodine is dissolved completely and dropwise added in the reaction system, reaction is performed for 2 hours until the reaction is complete; heating is stopped, the temperature is cooled below 30 DEG C, a reaction device is changed into a distillation device to collect main distillate fractions, and then colorless liquid iodotrimethylsilane competitive products are obtained.

The invention provides a preparation method of hexamethyldisilane sodium amine solution which is characterized in that hexamethyldisilazane and sodium hydride react with each other in high boiling point solvent or without solvent. When the reaction is finished completely, tetrahydrofuran is used for the dissolution to obtain hexamethyldisilane sodium amine tetrahydrofuran solution, wherein, the mol ratio of the hexamethyldisilazane to the sodium hydride is 1.0 to 0.8-1.2. The sodium hydride is oil dispersed sodium hydride with the content of 60-70 percent and the reaction temperature of 80-130 DEG C. The reaction temperature in the high boiling point solvent is the reflux temperature, and the reaction time is 3-4 hours of the reflux state. Shown by detection and organic synthesis tests, the preparation method adopted by the invention has the advantages of simplicity, fast reaction speed and completeness of reaction.

The invention relates to pharmaceutical chemistry technology field. The present invention discloses a synthesis method of 2-deoxy-5-iodo-beta-urdine synthesis method. The method is: heating ura with hexamethyldisilane, reacting with chloro-sugar, removing protecting group in methanol ammonia solution, obtaining 2-deoxy-beta- urdine, reacting with iodine in the presence of silver sulfate to obtain the 2-deoxy-5-iodo-beta-urdine. Compared with the other method, the inventive method has the following character: reaction condition is simple, material is easy to get and toxicity is little, dosage is little. The product yield and purity are high, cost of material reduce 50% more than original method so the present method is suitable for industrial production.

The invention discloses an organosilicon compound and a synthesis method thereof. The comprises the following steps: under the catalytic action of a palladium catalyst, in the presence of an organic solvent and an oxidizing agent, carrying out a C-H activation reaction on an acetophenone derivative provided with a guiding group and hexamethyldisilane to prepare a target product, namely, the organosilicon compound. The method is higher in reaction efficiency and selectivity, an organosilicon compound with a complex structure is obtained in one step, then commercially available acetophenone micromolecules are directly used as a substrate, ortho-position C-H silicification of acetophenone derivatives can be directionally realized under the auxiliary action of a guiding group by installing the guiding group, and the method has higher selectivity. The compound can be further used in the fields of organic synthesis conversion, materials science, medicinal chemistry and the like, and especially has a relatively high potential value and a wide application prospect in the field of medicinal chemistry.

The invention discloses a preparation method of a PVC special-effect halogen-free flame retardant. The preparation method comprises the following steps: adding a magnesium material into a reaction kettle; the preparation method comprises the following steps: adding phosphorus-containing polysiloxane DVP into a reaction kettle, adding a tetramethylammonium hydroxide aqueous solution and hexamethyldisilane, titrating and flocculating to remove unreacted raw materials, water and tetramethylammonium hydroxide, filtering and drying to obtain slightly yellow transparent solid powder; putting the fixed powder into a jet mill experiment machine, and putting the ultrafine crushed raw material into a high-speed surface treatment machine; 3-aminopropyl methyl dimethoxy silane is added, and the mixture enters a stock bin after being qualified; the halogen-free gas barrier powder material and the material in the stock bin are mixed according to the mass ratio of 1: 5 and put into a zero-gravity mixing machine, and finally the mixture is packaged by a packaging machine; the invention has the advantages that: organic silicon molecules accelerate surface carbon formation, improve gas barrier property and effectively improve the flame retardant property of the finished product, the refractive index is close to that of pure PVC resin, the transparency of the finished product is hardly influenced, and the heat resistance is good.

The synthesis method of hexamethyldisilane relates to a chemical process. Under anaerobic conditions, the temperature is raised and stirred in a reaction kettle filled with xylene, crown ether and metal sodium, and trimethylchlorosilane is added dropwise into the reaction kettle , after the end, control the temperature in the reactor, keep warm, and then lower the temperature to 50°C ± 5°C, add water dropwise to the reactor, let it stand for stratification, and distill and dehydrate through an oil-water separator to obtain the crude product Liujia base disilane. The present invention uses metal sodium and trimethylchlorosilane to react with the participation of crown ether, changes the potential of metal sodium, improves the activity of metal sodium, and makes it react with trimethylchlorosilane, and the crude product yield can reach 73.17%; The process of the invention is simple, easy to control and convenient for industrialized production.

The invention discloses application of a novel material in preparing an anti-fogging board. The novel material comprises the following components (by weight): 10-20 parts of cement, 5-8 parts of hexamethyldisilane, 6-10 parts of methoxyphenol, 8-15 parts of silicon carbide, 4-6 parts of elastic fiber, 5-9 parts of phenolic resin and 5-20 parts of water. Compared with the prior art, the invention has the advantages as follows: the novel material is low-cost and is simple to operate and easy to promote; and the board prepared from the novel material has better heat-insulation, waterproof and anti-fogging effects.

The invention discloses a synthesis method of a novel aryl silane compound, which comprises the following steps: taking hexamethyldisilane and nitro-aromatic hydrocarbon as raw materials, and realizing one-step denitration C-Si coupling of the nitro-aromatic hydrocarbon and the hexamethyldisilane through a palladium catalyst to obtain the aryl silane compound. Wherein the one-step denitration silicon-based reaction is directly utilized, so that the steps and the economic benefits are greatly improved, and the process cost is reduced; compared with silicon-based boric acid ester, hexamethyldisilane has the advantages of stable property, low price, low toxicity and the like. Therefore, compared with the existing method, the method has the advantages of simplicity and convenience in operation, easiness in obtaining raw materials, high efficiency, economy, environment friendliness and the like.

The invention discloses application of a novel material in preparing a waterproof board. The novel material comprises the following components (by weight): 10-20 parts of cement, 5-8 parts of hexamethyldisilane, 6-10 parts of methoxyphenol, 8-15 parts of silicon carbide, 4-6 parts of elastic fiber, 5-9 parts of phenolic resin, and 5-20 parts of water. Compared with the prior art, the invention hasthe advantages as follows: the novel material is low-cost and is simple to operate and easy to promote; and the board prepared from the novel material has better heat-insulation, waterproof and anti-fogging effects.

The invention discloses a light guide plate and a preparation method thereof. The light guide plate includes a light emitting surface, a back surface and side surfaces; the light emitting surface is opposite to the back surface; the side surfaces are connected to the light emitting surface and the back surface, wherein at least one side surface is provided with a light incident layer; and a portion other than the light incident layer of the light guide plate is a PS layer. The light incident layer material is composed of the following parts by weight: polyethylene glycol terephthalate, ultrafine modified alumina, n-propyl silicate, hydroxypropyl methylcellulose, ultrafine active silicon micro-powder, dimethyl silicone oil, polyetherimide resin, lauryl sodium sulfate, vinyl methyl ether, ethylene bis stearic acid amide, stearate, dibutyl phthalate, hexamethyldisilane, thermoplastic polyurethane elastomer, calcium hydrogen phosphate, dioctyl ester, stabilizer and composite antioxidant; the light guide plate is prepared by mixing various components; and the light guide plate has strong stability and good light transmittance, and can reduce light loss.

The invention relates to the technical field of plywood, in particular to a manufacture method of environment-friendly plywood. The manufacture method has the advantages that surfaces of veneers are subjected to enzymolysis through soaking liquid, part of organic matters, such as celluloses, of the surfaces of the veneers are degraded, and active groups of the surfaces of the veneers are increased; degreased soybean meal and waterborne polyurethane are subjected to compound modification to improve mechanical property and viscosity of the degreased soybean meal, and mixing and compounding withan organosilicone monomer is then performed; the organosilicone monomer hexamethyldisilane is subjected to pyrolysis under the action of hydroxyacetamide and platinic oxide during hot pressing, is polymerized with methacryloxymethyl tris(trimethylsiloxy)silane and is compounded with the modified degreased soybean meal to improve bonding strength; silicon oxygen bonds are compounded with the activegroups on the veneers to further improve bonding strength; during preparation of the plywood, no formaldehyde is released, and safety and environment protection are achieved.

The invention belongs to the technical field of coating preparation, and particularly relates to a method for preparing an amorphous SiOC coating by adopting a chemical vapor deposition process. A thermal excitation type chemical vapor deposition system is adopted, hexamethyldisiloxane (HMDSO) or hexamethyldisilane or tetraethoxysilane, absolute ethyl alcohol and a hydrogen and argon gas system are selected, the ratio of organosilane to the absolute ethyl alcohol is controlled, under the conditions that the working pressure intensity is 10-1000 Pa and the temperature is 1000-1200 DEG C, the amorphous SiOC coating which is compact in structure and 0.1-50 microns in thickness is deposited on the surface of stainless steel, carbon steel or other alloys, the hardness range of the amorphous SiOC coating is 6-15 GPa, and the friction coefficient range is 0.02-0.2. The amorphous SiOC coating is good in chemical stability, good in wear resistance, high in oxidation resistance, high in creep resistance and good in binding force with stainless steel, carbon steel and other alloy matrixes. The amorphous SiOC coating can remarkably improve the friction and wear performance of the stainless steel and prolong the service life of a metal material.

The invention belongs to the technical field of ceramic tube preparation, and particularly relates to a method for preparing a silicon carbide tube by adopting a chemical vapor deposition process. A thermal excitation type chemical vapor deposition (CVD) system is adopted, an aluminum oxide ceramic tube or a graphite tube is selected as a deposition matrix, hexamethyldisilane (HMDS), H<2> and Ar are selected as a gas system, deposition is carried out under the conditions that the working pressure is 10-1000 Pa and the temperature is 650-1350 DEG C, and after the aluminum oxide ceramic tube or the graphite tube is removed, silicon carbide tubes with compact structures and different inner and outer diameters are obtained. The method is used for manufacturing heat exchanger tubes of corrosive media, abrasion-resistant water flow spray tubes, other high-temperature environment devices and the like.