7 results about "Dibutyl ether" patented technology

The invention provides a bio-based 1, 4-butanediol composition as well as a preparation method and application thereof, and the bio-based 1, 4-butanediol composition comprises bio-based 1, 4-butanediol, 4-hydroxybutyric acid-(4-hydroxyl) butyl ester and bis (4-hydroxyl) dibutyl ether. The total mass content of 4-hydroxybutyric acid-(4-hydroxyl) butyl ester and bis (4-hydroxyl) dibutyl ether in the bio-based 1, 4-butanediol composition is 51 to 220 ppm. The bio-based 1, 4-butanediol composition has low hygroscopicity, and can maintain low water content after long-term storage; meanwhile, when the bio-based 1, 4-butanediol composition is used for polyester synthesis, the esterification time can be shortened, the reaction efficiency can be improved, side reactions can be reduced, and a polyester product with better damp-heat resistance stability can be obtained.

The invention relates to the technical field of organic silicon catalysis, and discloses a hydrosilylation reaction catalyst and a preparation method thereof, the catalyst is prepared from a platinum complex catalyst solution, maleic anhydride, triphenyl borate, tetraethoxysilane, propylene carbonate and diethylene glycol dibutyl ether; the preparation method comprises the steps of solvent water removal, electronic relay adduct preassembly, active metal introduction, thermal induction aging and the like. An electron-deficient coordination center is constructed through a step-by-step process, the electron cloud density of the platinum center is reduced by utilizing the Lewis acid characteristic of triphenyl borate, and the solvent cage effect of propylene carbonate is matched, so that the high-temperature tolerance of the catalyst is improved, and the generation of platinum black is effectively inhibited; meanwhile, the solubilizing and bridging effects of diethylene glycol dibutyl ether are utilized, the compatibility problem of a high-polarity component and a non-polar silicone oil matrix is solved, and the obtained catalyst has high activity, high regioselectivity and excellent long-term storage stability.

The present application relates to a kind of synthesis method of tetramethyl biphenyl diphenol type epoxy resin, belong to epoxy resin preparation technical field.The yield of tetramethyl biphenyl diphenol type epoxy resin synthesized in the present application is greater than 94%, and total chlorine content is less than 240ppm.This is due to the process of two-step reaction in the present application, while adding mixed ether solvent consisting of diethylene glycol dibutyl ether, isobutoxy cyclohexane and triethyl glycerol ether in etherification reaction stage, diethylene glycol dibutyl ether and isobutoxy cyclohexane are slightly soluble in water, triethyl glycerol ether is insoluble in water, but the three solvents have good solubility for epoxy chloropropane and phenolic compounds, the use of three compounds can form transition phase, promote the migration of basic catalyst in aqueous phase to two-phase interface to participate in reaction, promote etherification reaction to proceed stably, avoid the occurrence of side reaction, and then improve product yield and purity, reduce total chlorine content.

The invention relates to a synthesis method of tetramethyl biphenol type epoxy resin, and belongs to the technical field of epoxy resin preparation. The yield of the synthesized tetramethyl biphenol type epoxy resin is greater than 94%, and the total chlorine content is less than 240ppm. A two-step reaction process is adopted, a mixed ether solvent consisting of diethylene glycol dibutyl ether, isobutoxycyclohexane and triethyl glyceryl ether is added in an etherification reaction stage, the diethylene glycol dibutyl ether and the isobutoxycyclohexane are slightly soluble in water, the triethyl glyceryl ether is insoluble in water, and the diethylene glycol dibutyl ether, the isobutoxycyclohexane and the triethyl glyceryl ether are not soluble in water. However, the three solvents have good solubility for epoxy chloropropane and phenolic compounds, and the three solvents are compounded for use, so that a transition phase can be formed, a basic catalyst in a water phase can be promoted to more uniformly migrate to a two-phase interface to participate in a reaction, an etherification reaction is promoted to be stably carried out, side reactions are avoided, the yield and purity of a product are further improved, and the total chlorine content is reduced.

This invention belongs to the field of chemical production technology, specifically disclosing a purification method for trimethoxy(pentamethylcyclopentadienyl)titanium, comprising the following steps: vacuum distillation of crude trimethoxy(pentamethylcyclopentadienyl)titanium raw material to obtain a crude distillate; adding 5-20 parts by mass of a modifier to 100 parts by mass of the crude distillate, wherein the modifier is at least one selected from triethylene glycol dibutyl ether, tetraethylene glycol dibutyl ether, n-heptadecane, n-octadecane, and mineral oil, and then distilling to obtain the product. This invention achieves large-scale purification of Star-Ti, achieving a distillation yield of over 75%, with a maximum of over 95%, and obtaining a high-purity product with an organic purity of over 99.5%, solving the problems of difficult large-scale purification, difficulty in purity improvement, and low recovery rate of Star-Ti in existing technologies.

The application relates to the technical field of silicone catalysis, and discloses a hydrosilylation reaction catalyst and a preparation method thereof. The catalyst is made of a platinum complex catalyst solution, maleic anhydride, triphenyl borate, tetraethyl orthosilicate, propylene carbonate and diethylene glycol dibutyl ether; the preparation method involves the steps of solvent dewatering, pre-assembly of an electronic relay adduct, active metal introduction and heat-induced aging. The application constructs an electron-deficient coordination center through a step-by-step process, lowers the electron cloud density of a platinum center by using the Lewis acid property of triphenyl borate, improves the high-temperature resistance of the catalyst by matching the solvent cage effect of propylene carbonate, and effectively inhibits the generation of platinum black; meanwhile, the solubilization bridging effect of diethylene glycol dibutyl ether is used to solve the compatibility problem of high-polarity components and non-polar silicone oil matrix, and the obtained catalyst has high activity, high regioselectivity and excellent long-term storage stability.

The invention provides an ultralow-thermal-resistance low-temperature welding material, a preparation method and a welding method, and belongs to the technical field of electronic packaging and thermal management materials.The ultralow-thermal-resistance low-temperature welding material comprises, by weight, 70%-85% of tin-bismuth alloy powder, 5%-10% of gallium-based liquid metal and 5%-25% of scaling powder, the tin-bismuth alloy powder comprises tin and bismuth, the gallium-based liquid metal comprises gallium and indium, and the scaling powder comprises the tin-bismuth alloy powder, the gallium-based liquid metal and the scaling powder. The soldering flux comprises modified rosin, dipropylene glycol and diethylene glycol dibutyl ether. The preparation method comprises the following steps: preparing the tin-bismuth alloy powder, the gallium-based liquid metal and the soldering flux, mixing the gallium-based liquid metal with the soldering flux, mechanically stirring, and ultrasonically dispersing until the materials are uniformly mixed; and adding tin-bismuth alloy powder into the mixture, mechanically stirring, and cooling to room temperature. In the welding process, tin and bismuth react with the base material to generate an IMC layer, gallium and indium are filled in a welding cavity in a high-temperature molten state, and a compact IMC interface is generated. The interface thermal resistance is reduced, and the compatibility, the safety and the connection reliability are improved.