270 results about "Silyl ether" patented technology

The present disclosure is directed to compositions and methods that may be used for enhanced oil recovery, for modifying the permeability of subterranean formations and for increasing the mobilization and/or recovery rate of hydrocarbon fluids present in the formations. The compositions may include, for example, expandable cross linked polymeric microparticles having an unexpanded volume average particle size diameter of from about 0.05 to about 5,000 microns and a cross linking agent content of from about 100 to about 200,000 ppm of hydrolytically labile silyl ester or silyl ether crosslinkers and from 0 to about 300 ppm of non-labile crosslinkers.

The invention discloses a water soluble antirusting fluid, and a preparation method and a using method thereof. The antirusting fluid comprises the following components in part by mass: 2 to 8 parts of base oil, 3 to 10 parts of antirusting agent, 2.5 to 4 parts of emulsifier, 0.2 to 1 part of antirusting aid, 0.1 to 1 part of stabilizer, 0.1 to 1 part of dispersing agent, and 0.01 to 0.5 part of bacteriacide, wherein the base oil is No.10 light mechanical oil; the antirusting agent is a complex of different antirusting agents; the emulsifier is a complex of OP-10, peregal O and peregal 6501; the antirusting aid is a complex consisting of polyoxy silyl ether; the stabilizer is triethanolamine; the dispersing agent is one or more of glycerol, alcohol and kerosene; and the bacteriacide is sodium benzoate. The antirusting fluid is high in antirusting capacity, solution stability and treatment capacity, low in cost and environment-friendly; and the preparation method for the antirusting fluid is simple and does not require massive equipment investment, and the using method is simple and easy to implement.

Provided are compositions suitable for use in forming a flexible optical waveguide. The compositions include a polymer, having units of the formula (RSiO_1.5), wherein R is a substituted or unsubstituted organic group, and a plurality of functional end groups. A first component is provided for altering the solubility of the composition in a dried state upon activation. A second component contains a plurality of functional groups chosen from hydroxy, amino, thiol, sulphonate ester, carboxylate ester, silyl ester, anhydride, aziridine, methylolmethyl, silyl ether, and combinations thereof. The second component is present in an effective amount to improve flexibility of the composition in a dried state before and after activation. Also provided are flexible optical waveguides, methods of forming flexible optical waveguides and electronic devices that include a flexible optical waveguide.

The invention belongs to the field of drug synthesis and relates to an entecavir compound and a synthetic method of an intermediate of the entecavir compound. The novel synthetic method comprises: by taking (S)-3-hydroxyl dimethyl adipate as an initial raw material, preparing an intermediate 9 through hydroxyl TBS protection, Dieckmann condensation reaction, ketone protection to ketal, ester group reduction to hydroxyl, hydroxyl protection, deprotection, ketone to silyl enol ether and Rubottom oxidizing reaction; and preparing entecavir from the intermediate 9 through wittig reaction, Mitsunobu reaction, silicon preventing radical group removal and basic hydrolysis. The novel synthetic method provided by the invention is mild and easily controllable in reaction condition, simple to operate, high in product yield, high in purity and suitable for industrialized mass production.

The invention relates to the pharmaceutical field, and concretely relates to a method for preparing vicagrel and derivatives thereof. The method comprises a step 1 of adopting optically-active alkyl sulfonate to carry out selective N-alkylation of 4,5,6,7-tetrahydrothieno[3,2-c]pyridine-2-ol silyl ether, and a step 2 of directly esterifying a product generated in step 1 to obtain vicagrel. The method has the advantages of less side reactions, high yield, high chemical purity and optical purity, low cost, simple operation, and suitableness for the industrialized production.

The invention discloses a purification method of silicon tetrafluoride prepared by using fluoride and silicon source power as raw materials, which comprises the following steps: 1. removing nitrogen, oxygen and carbon dioxide in coarse silicon tetrafluoride produced by using the fluoride and the silicon source power as the raw materials through a lightness-removing column at the temperature of 150 DEG C below zero to 50 DEG C below zero, wherein the pressure of the lightness-removing column is 0.1 to 3MPa; 2. introducing a liquid-phase material at the bottom of the lightness-removing column into a weight-removing column, removing moisture and fluorine hydride from the column bottom at the temperature of 20 to 80 DEG C below zero, and discharging silicon tetrafluoride gas from the column top, wherein the pressure of the weight-removing column is 0.5 to 5MPa; 3. enabling the silicon tetrafluoride gas to pass through a triple-stage absorption column in which activated carbon is filled to absorb and remove dimethyl silicon ether hexafluoride; and 4. connecting the purified silicon tetrafluoride gas from the absorption column into a compressor pipeline and introducing into a storage tank for standby after being compressed to 2.5MPa. The coarse silicon tetrafluoride can be finally purified to the purity of more than 99.5% by the invention, thereby the use requirements of electron and semiconductor trades are completely satisfied.

Hydrophobic α(1→4)glucopyranose polymers with enhanced degradation properties are described. Between the α(1→4)glucopyranose polymeric portion and the hydrophobic portion exists a linker portion having a silyl ether chemistry that facilitates degradation of the polymer. Biodegradable matrices can be formed from these polymers, and the matrices can be used for the preparation of implantable and injectable medical devices wherein the matrix is capable of degrading in vivo at an increased rate. Matrices including and capable of releasing a bioactive agent in vivo are also described.

The invention discloses a preparation method of silicon-aluminum composite aerogel powder. The preparation method concretely comprises the following steps of (1) mixing coal ash subjected to high temperature activation treatment and a hydrochloric acid solution to perform acid dissolution reaction, performing suction filtration on an obtained reaction solution, mixing obtained filter residues andan inorganic alkaline solution to perform alkaline dissolution reaction, and performing suction filtration; (2) adopting hydrogen-type cation exchange resin to perform exchange on an obtained silicoaluminate salt solution until a pH value of the solution is 2-3, then adopting ammonia water to catalyze an obtained silicoaluminate solution to perform catalysis until a pH value is 5-7, and then performing ageing; (3) adopting ethanol to perform solvent replacement on obtained silicon-aluminum hydrogel to obtain silicon-aluminum alcogel; (4) adopting a mixed solution of hexamethyldisiloxane and the ethanol to perform surface modification on the silicon-aluminum alcogel; and (5) performing ambient pressure drying, crushing and screening on the silicon-aluminum gel with the hydrophobic surface to obtain the silicon-aluminum composite aerogel powder. The preparation method has the advantages of wide source of raw materials, low cost, simpleness in preparation technology, suitability for industrial production in large scale and the like.

A base material for adhesion to be adhered to a solid body comprising;

• • a substrate made from metal, polymer resin, glass or ceramics whose surface is adhesive to the solid body by silyl-ether-linkage that at least one active silyl group selected from the group consisting of a hydrosilyl-containing silyl group, a vinyl-containing silyl group, an alkoxysilyl-containing silyl group and a hydrolytic group-containing silyl group having reactivity with a reactive group on the surface of the solid body is bound to a dehydrogenated residue of hydroxyl group on the surface of the substrate.

The invention discloses a methyl MQ resin preparation method, which comprises: adding an organic solvent 1 to a sodium silicate aqueous solution in a dropwise manner under stirring, stirring at a temperature of 25+/-2 DEG C, standing, generating precipitate at the bottom portion of the sodium silicate aqueous solution, taking out the sodium silicate aqueous solution, and adding corresponding waterto obtain a refined sodium silicate aqueous solution; carrying out a reaction on an acid and the refined sodium silicate aqueous solution, adding an organic solvent 2 and silyl ether, and carrying out a reflux reaction; separating the reaction product, and purifying; and carrying out spray drying on the obtained purified product to obtain the methyl MQ resin. According to the present invention, the methyl MQ resin prepared from the refined sodium silicate aqueous solution has high molecular weight compared with the methyl MQ resin prepared from the non-refined sodium silicate aqueous solution, and further has narrow molecular weight distribution; the excess silyl ether can be used as both the reaction material and the extractant for the reaction product; and during the post-treatment, thewater washing is avoided so as to prevent the emulsification. The present invention further provides a high molecular weight methyl MQ resin having a molecular weight of greater than 10000 g/mol.

The invention discloses a method for preparing simvastatin. The method is as follows: a. lovastatin and alkylamine are prepared into lovastatin amide; b. hydroxyl groups in lovastatin amide molecules are protected, and lovastatin amide di-(trimethyl) silyl ether is generated; c. the lovastatin amide dimethyl (trimethyl) silyl ether is subjected to methylation, so as to obtain simvastatin amide di-silyl ether; d. the simvastatin amide di-silyl ether is protected, and simvastatin amide is generated; e. the simvastatin amide is subjected to hydrolysis and is added with ammonia gas, and simvastatin ammonium salt is obtained; and f. the simvastatin ammonium salt is subjected to ring closure to generate the simvastatin. The method takes a composite solvent of tetrahydrofuran and cyclonexane as a solvent for the protective reaction; the lovastatin amide di-(trimethyl) silyl ether can directly perform methylation reaction without alkaline washing and water scrubbing; after water scrubbing of methylate, protective groups are automatically fallen off, thereby the reaction for removing the protective groups is saved and the products can directly perform ammonium salt reaction. The method simplifies the synthesis technique of the simvastatin.

The invention discloses a method for preparing obeticholic acid, 7-ketolithocholicacid and ursodeoxycholic acid. Cholic acid is used as a raw material for preparing obeticholic acid through selectiveprotection by a 3-alpha-hydroxyl group, selective oxidation of a 7-alpha-hydroxyl group, esterification of a 24th carboxyl group, methanesulfonation of a 12-alpha-hydroxyl group, elimination, hydrolysis, silylation, condensation, hydrolysis, catalytic hydrogenation, carbonyl reduction and other reactions; an intermediate is subjected to catalytic hydrogenation to prepare the 7-ketolithocholicacidand then is reduced to prepare the ursodeoxycholic acid. The method provided by the invention uses cheap cholic acid as the raw material, and has advantages of novel synthesis method, low cost, high yield, mild reaction condition, high simplicity in operation, environmental friendliness and high convenience in industrial production.

The invention discloses silyl ether mixed defoaming agent emulsion and a preparation method thereof. The silyl ether mixed defoaming agent emulsion is prepared from the following components: linear simethicone, allyl ether modified polysiloxane, polyoxypropylene glyceryl ether, modified white carbon black, triethanolamine and a compound emulsifier. The preparation method comprises the following steps: uniformly mixing the linear simethicone and the modified white carbon black, and heating to obtain a mixture I; adding triethanolamine into the mixture I, stirring and cooling to obtain a mixture II; adding the allyl ether modified polysiloxane and the polyoxypropylene glyceryl ether, and further stirring to obtain a mixture III; adding the compound emulsifier into the mixture III, and stirring at high speed to obtain coarse emulsion; adding thickening water into the coarse emulsion, and preparing raw emulsion; and pouring the raw emulsion into a high-speed homogenizer for stirring to obtain the fine-smooth and stable emulsion. The defoaming agent easily dissolves in water, and is small in specific surface area, high in defoaming speed, lasting in foam inhibition and small in use amount; the preparation method is convenient and easy to operate; the defoaming agent has no toxic effects on microorganisms, has an effect of promoting the growth of mycelia, is beneficial to microbial fermentation and is relatively environmentally friendly.

The present invention relates to one new kind o silyl-ether compound and its preparation and application. The compound has the structure shown in the general expression (I).

The invention relates to a degreasing agent used for dyeing in one bath and with multiple functions. The degreasing agent is characterized by being composed of the following ingredients by mass percent: 5-20% of fatty alcohol polyoxyethylene ether, 5-20% of modified fatty amine polyoxyethylene ether, 2-10% of a dispersing agent, 5-10% of a solvent, 0.3-1% of polyether modified silyl ether ester and the balance of water. The degreasing agent used for dyeing in one bath and with multiple functions is easy in application and simplified in operation, and only one auxiliary is added. In the aspectof effect, dye dispersing and uniform dyeing effects are better during textile dyeing; besides, the degreasing agent has low foaming property and is easy to clean, degreasing is thorough during one-bath process dyeing of multiple fiber fabrics, removed grease stains are dispersed in dye liquor and can not touch a cloth cover and the inner wall of a dye vat, so that the problems of color tone, color spot, nonuniform dyeing and the like can be effectively avoided, deposition of cation and anion dyes also can be avoided, time, electricity and water are saved at the same time, energy conservationand emission reduction are realized, and economic benefit is effectively improved, so that energy-saving and environmental requirements can be better met.

The invention provides modifying organoaluminum co-catalysts for improved performance. Processes of making catalyst compositions are provided. In an exemplary embodiment, the processes include modifying an organoaluminum compound with a modifier that decreases the initial reducing strength of the organoaluminum compound, where the modifier can be an ether, an anhydride, an amine, an amide, a silicate, a silyl ether, a siloxane, an ester, a carbonate, a urea, a carbamate, a sulfoxide, a sulfone, a phosphoramide, or a combination thereof. The processes further include adding a transition metal complex to the mixture of the organoaluminum compound and the modifier; and obtaining a catalyst composition including the organoaluminum compound and the transition metal complex.

The invention provides ultra-high-molecular-weight polyether modified polysiloxane for a flatting agent and a preparation method and application of polyether modified polysiloxane. The preparation method of the polyether modified polysiloxane comprises the steps that allyl polyether and dichloromethylsilane are subjected to a hydrosilylation reaction in a solvent under catalysis of a platinum catalyst, and silyl ether is obtained; alkyl silane and obtained silyl ether are mixed and dropwise added to water for a hydrolysis reaction, and a hydrolysate is obtained; under catalysis of a basic catalyst, a cyclosiloxane monomer and the hydrolysate are subjected to a copolymerization reaction, and ultra-high-molecular-weight polyether modified polysiloxane is obtained through a neutral reaction.According to the preparation method, the smooth characteristic of ultra-high-molecular-weight polysiloxane is sufficiently used, the dispersibility of modified polysiloxane is excellent, and the smoothness and luster of water-based ink and paint are effectively improved; adopted polyether is easy to acquire, high in selectivity and low in cost.

The invention discloses a floating environmental restoration material of Fe2O3-doped TiO2 loaded expanded perlite and a preparation method of the floating environmental restoration materials. According to the conditions that the expanded perlite is a low-density porous material, and has the characteristics of being free of toxicity and high in acid and alkali resistance and adsorptivity, a lot of silanol groups and silyl-ether groups exist on the surface and are combined with the photocatalysis ability of TiO2, and the photocatalysis ability is further improved by using Fe2O3 doping and calcination in oxygen and/or ammonia gas to prepare the easy-to-recover environmental restoration material. The environmental restoration material can be applied to removal of organic pollutants in the environment.

The invention provides a halogen-free flame-retardant electronic material and a preparation method thereof. The preparation method comprises the following steps: adding a fullerene derivative into a cyanate chlorobenzene solution, adding diethylbenzene phosphate and enol silyl ether, carrying out reflux reaction for 80 minutes, adding dicarboxyl phthalimide, reacting for 75 minutes, and simultaneously carrying out rotary evaporation and drying to remove a solvent, so as to obtain a cyanate prepolymer; mixing the cyanate prepolymer with N-4-hydroxyphenyl maleic anhydride alkylamine, naphthol phenolic resin and tetraglycidyl diaminomethylene, stirring at 120 DEG C for 45 minutes, adding silicon carbide short fibers and 1,8-octane dithiol, continuing to stir for 20 minutes, and naturally cooling, so as to obtain a cyanate modified matter; crushing the cyanate modified matter, adding the crushed cyanate modified matter, polyphenylene sulfide and hollow aluminum oxide into an extruder, carrying out extrusion at 155 DEG C, so as to obtain halogen-free flame-retardant particles; and carrying out hot-pressing on the halogen-free flame-retardant particles, so as to obtain the halogen-free flame-retardant electronic material. The prepared halogen-free flame-retardant electronic material has excellent flame retardance and very good dielectric property and thermal performance.