37results about How to "Facilitate addition reaction" patented technology

The invention discloses a low-temperature quick-drying type polyurethane acrylate coating. The coating consists of a component A and a component B by a mass ratio of 100 to (20-27), wherein the component A comprises the following components in percentage by mass: 20-45 percent of hydroxyl acrylic resin, 4-7 percent of amino resin, 2-12 percent of modified polyaspartic acid ester, 4-10 percent of a pigment, 8-20 percent of filler, 0.1-2 percent of a dispersant, 0.1-2 percent of a defoaming agent, 0.1-2 percent of a flatting agent, 0.1-2 percent of a silane coupling agent, 0.1-2 percent of a PH regulating agent and 15-25 percent of a mixed solvent; the component B is isophorone diisocyanate. The coating disclosed by the invention has the characteristics of being rapid, cured at low temperature, excellent in physical and mechanical properties and the like, is excellent in adhesive force to various base materials (iron, aluminum alloy, zinc plated plates, stainless steel and the like), and can be widely applicable to industrial coating of costly furniture, steel structures, railway locomotives and the like. The invention also discloses a preparation method of the low-temperature quick-drying type polyurethane acrylate coating.

Provided are a novel isocyanide compound, a hydrosilylation reaction catalyst having excellent handling properties and storage properties that allows a hydrosilylation reaction to proceed under moderate conditions by using the isocyanide compound, and a method for producing an addition compound by a hydrosilylation reaction using the hydrosilylation reaction catalyst. A hydrosilylation reaction catalyst prepared from a catalyst precursor comprising a transition metal compound of groups 8, 9, or 10 of the periodic table, excluding platinum, such as an iron carboxylate, cobalt carboxylate, or nickel carboxylate, and a ligand comprising an isocyanide compound having an organosiloxane group.

A hydrosilylation reaction catalyst prepared from: a catalyst precursor comprising a transition metal compound, excluding platinum, belonging to group 8-10 of the periodic table, e.g., iron acetate, cobalt acetate, nickel acetate, etc; and a ligand comprising a carbine compound such as 1,3-dimesitylimidazol-2-ylidene, etc.. The hydrosilylation reaction catalyst has excellent handling and storage properties. As a result of using this catalyst, a hydrosilylation reaction can be promoted under gentle conditions.

The invention discloses a method for synthesizing terpinum from turpentine oil and preparing terpineol and acetic ester. The method comprises the following steps: turpentine oil, water, phosphoric acid, alpha-hydroxy acid, a cocatalyst and an emulsifier are added into a reaction kettle, stirring is started, and a synthetic product is obtained after a reaction; the synthetic product is allowed to stand for crystallization, filtering is performed to obtain a hydrated terpinum crystal, a filter liquid is allowed to stand for delamination, and the upper layer is oil containing a hydrous product; the terpinum crystal is added into a dehydration reaction kettle and water is added thereto, stirring and heating are performed, and the reaction is allowed to obtain a crude terpineol product; the terpinum crystal is added into an esterification reaction kettle, acetic anhydride is added, stirring is performed, a temperature reaction is performed to obtain a crude acetic ester product; the crude terpineol product or the ethyl ester product is neutralized by lime water, water washing is performed, and a product after the water washing is subjected to vacuum fractionation to obtain a refined terpineol or acetic ester product. The method provided by the invention has the advantages of simple process, less discharge of three wastes, mild reaction conditions, high yield of terpineol, and relatively good social, ecological and economic benefits.

The invention discloses a synthetic method of hexamidine. Hexamidine is a key raw material for producing antibiotic medicines hexamidine salts (such as dihydrochloride and dihydroxyethyl sulfonate). The synthetic method of hexamidine comprises the following steps: 1, reacting p-cyanophenol with 1,6-dibromohexane in an ethanol-water solution of sodium hydroxide to prepare 1,6-(p-cyanophenyl)hexyl diether (an intermediate I); 2, carrying out alcoholysis on the intermediate I in ethanol-toluene under the catalysis of trifluoroacetic acid or methanesulfonic acid to prepare 1,6-(p-ethyl iminoformate phenyl)hexyl diether (an intermediate II); and 3, carrying out aminolysis on the intermediate II in a methanol-ammonia solution to prepare hexamidine. The total yield of three-step synthesis is greater than 72%, and a nuclear magnetism identification result shows that the above obtained product is a preconceived structure product. The method is suitable for large-scale industrial production.

The invention discloses a composite metal photocatalysis system which is represented by Ni-M-X-Y-Z, wherein M is selected from the group consisting of Al, Ag, Bi, Cd, Ge, Sb and Sn; x is selected fromthe group consisting of triphenylphosphine, triethylphosphine, tributylphosphine, tri-tert-butylphosphine and tricyclohexylphosphine; Y is selected from the group consisting of carbon nanorods, molecular sieves, ordered mesoporous carbon and silicon dioxide; Z is selected from the group consisting of diphenyl disulfide, dicumyl peroxide, hydrazine and 2,4-dinitrophenylhydrazine; the mass fractionof Ni is 10-20%; the mass fraction of M is 20-30%; the mass fraction of X is 20-40%; the mass fraction of Y is 15-40%,; and the mass fraction of Z is 10-30%. The catalytic system is used for preparing 1,1,2,3,3-pentamethylindane through free radical cycloaddition of alpha-methylstyrene and 2-methyl-2-butene, an conversion rate is larger than 90%, and selectivity is larger than 85%; and a catalystis stable and not prone to loss in the free radical cycloaddition reaction. A method provided by the invention is easy to operate and good in economic benefit.

The invention discloses a synthetic method of hexamidine. Hexamidine is a key raw material for producing antibiotic medicines hexamidine salts (such as dihydrochloride and dihydroxyethyl sulfonate). The synthetic method of hexamidine comprises the following steps: 1, reacting p-cyanophenol with 1,6-dibromohexane in an ethanol-water solution of sodium hydroxide to prepare 1,6-(p-cyanophenyl)hexyl diether (an intermediate I); 2, carrying out alcoholysis on the intermediate I in ethanol-toluene under the catalysis of trifluoroacetic acid or methanesulfonic acid to prepare 1,6-(p-ethyl iminoformate phenyl)hexyl diether (an intermediate II); and 3, carrying out aminolysis on the intermediate II in a methanol-ammonia solution to prepare hexamidine. The total yield of three-step synthesis is greater than 72%, and a nuclear magnetism identification result shows that the above obtained product is a preconceived structure product. The method is suitable for large-scale industrial production.

The invention relates to a method for preparing high-purity octafluoropropane, comprising the steps of: setting the reaction temperature to 50-250°C in a reactor, using cobalt trifluoride as a catalyst, hexafluoropropylene and fluorine as reaction gases, The reaction prepares octafluoropropane; the molar ratio of the hexafluoropropylene to the fluorine gas is 1:2-6. In this preparation method, cobalt trifluoride is used as a catalyst to realize continuous reaction, which promotes the addition reaction of hexafluoropropylene and fluorine gas, the conversion rate of hexafluoropropylene is almost 100%, and the yield of octafluoropropane can reach More than 90%, the selectivity of the reaction is good, and the content of by-products is small. The obtained crude product can prepare high-purity octafluoropropane after subsequent purification treatment, which is a low-cost, high-efficiency octafluoropropane production method that can realize industrial production.

The invention relates to the field of modified silicone oil, and particularly discloses acrylate modified silicone oil and a preparation method thereof. The acrylate modified silicone oil is characterized by being prepared from the following raw materials in parts by weight under the action of a catalyst: 100-120 parts of hydrogen-containing silicone oil, 150-200 parts of allyl acrylate, 2-5 parts of a polymerization inhibitor and 10-12 parts of a chain transfer agent, wherein the catalyst is a rhodium catalyst. The preparation method comprises the following steps: S1, uniformly mixing allyl acrylate, a rhodium catalyst and a polymerization inhibitor in proportion, and cooling to 5-8 DEG C to obtain a mixed raw material; s2, adjusting the temperature of the hydrogen-containing silicone oil to 10-15 DEG C to obtain pretreated hydrogen-containing silicone oil; s3, mixing the pretreated hydrogen-containing silicone oil and a mixed raw material for hydrosilylation reaction; the step S1 and the step S2 are not divided into a sequence. The method has the advantage that the product quality is improved.

The invention discloses modified rosin resin and belongs to the technical field of chemical industry. The modified rosin resin comprises, by weight, 55-60% of first-grade rosin, 5-10% of fumaric acid, 15-24.82% of glycerol, 10-20% of low-iodine-value fatty acid, 0.01-0.05% of anthraquinone, 0.02-0.05% of tri-(2, 4-di-tertiary butyl phenyl) phosphite ester, 0.01-0.05% of 2, 6- di-tertiary butyl p-cresol, 0.03-0.05% of 4, 4-di-(6-tertiary butyl-m-methylphenyl) thiophenol, and 0.01-0.05% of tri-nonyl phenyl phosphite ester. The modified rosin resin can solve the problem that road paint prepared is prone to discolor and poor in liquidity during actual production and application processes.

The invention discloses a preparation method of a water-based epoxy curing agent, which comprises the following specific preparation processes: (1) taking polyether amine, putting the polyether amine into a four-mouth reaction bottle, slowly dropwise adding a first epoxy compound in a nitrogen atmosphere, then heating to 80-150 DEG C, and reacting to obtain a polyether amine-epoxy adduct; and (2) putting benzyl polyamine and alcohol ether into a four-mouth reaction bottle, slowly adding the polyether amine-epoxy adduct in a nitrogen atmosphere, heating to 50-80 DEG C, reacting, cooling to 40-60 DEG C, slowly dropwise adding a second epoxy compound, heating to 50-80 DEG C, reacting, slowly adding water, and dispersing for 15-30 minutes to obtain the waterborne epoxy curing agent. According to the preparation method of the waterborne epoxy curing agent provided by the invention, the emulsifying property and the curing property are improved by improving the molecular structure of the curing agent.

Belonging to the catalysis field, the invention provides a preparation method of an iron-based pyrrolidone ionic liquid catalyst and a method for catalysis of olefin hydrosilylation reaction with thecatalyst in order to solve the problems of high catalyst cost and non-recyclability of catalyst in current hydrosilylation reaction. The catalyst prepared by the method provided by the invention can be used for catalyzing hydrosilylation reaction of olefin and hydrogen-containing alkoxy silane, the reaction conditions are mild, the raw material conversion rate is high, and the catalyst is convenient for recycling.

The invention provides a pyrido[1,2-a][1,2,4]triazole carbene ligand as well as a synthesis method and application thereof. A pyrido[1,2-a][1,2,4]triazole carbene-gold complex formed from the pyrido[1,2-a] [1,2,4]triazole carbene ligand shown as a formula V and gold can be applied to alkyne catalytic addition reaction, has Lewis acid / alkali double activation centers, and can depend on the 'synergistic activation effect' of the double activation centers, so that the catalytic effect which cannot be achieved or cannot be achieved by a conventional ligand is achieved, and the addition reaction ofa nucleophilic reagent to multiple bonds can be greatly accelerated.

The invention relates to the fields of adsorption desulfurization and hydrocarbon conversion, and discloses a method and system for producing clean gasoline from sulfur-containing light oil. The method includes: entering the first rectification tower into light sulfur-containing light raw materials and cutting them into light gasoline and heavy gasoline , heat the mixture flow of heavy gasoline and light gasoline and hydrogen source respectively, and send them to the first reaction section and the second reaction section of the pressurized fluidized bed reactor respectively to contact with the catalyst for reaction, and send the product stream to High-pressure separation is carried out in the high-pressure separator, and the obtained light component stream is separated and treated to obtain a circulating hydrogen stream, which is recycled as a part of the hydrogen source, and the obtained heavy component stream is sent to the second rectification tower for rectification treatment. Separation of liquefied gas and gasoline. The method and system for producing clean gasoline from sulfur-containing light oil of the present invention are suitable for prolific production of low-sulfur, high-octane gasoline and liquefied gas over a long period of time, and the liquid yield is high.

The invention discloses modified abietate for water-based alkyd resin and a method for manufacturing the modified abietate, and relates to the field of chemical technologies. The modified abietate comprises, by weight, 55-60% of first-grade rosin, 10-15% of soybean oil fatty acid, 1-5% of diphenol-based methane, 1-5% of paraformaldehyde, 19.8-27.5% of maleic anhydride and 0.2-0.5% of zinc oxide. The modified abietate and the method have the advantages that the cost of the water-based alkyd resin with the modified abietate can be lowered to a certain degree during actual production and application, and pollution can be reduced.

The invention provides a method for detecting an epoxy equivalent weight. The method comprises the following steps of: (a) uniformly mixing butanone, ethanol and hydrochloric acid to obtain a hydrochloric acid-ethanol-butanone solution; preheating polyethylene glycol to 100-110 DEG C, adding an epoxy compound, dissolving and cooling to obtain a sample solution to be detected; (b) adding the hydrochloric acid-ethanol-butanone solution to the sample solution to be detected, and vibrating; and (c) titrating the mixed solution obtained in the step b by using a sodium hydroxide standard solution till the solution is neutral, and calculating the epoxy equivalent weight according to the use amount of the sodium hydroxide. The method for detecting the epoxy equivalent weight, provided by the invention, has the characteristics of wide application range, short detection time, accurate result and capability of controlling the end point of an epoxy resin synthetic reaction in time.

The invention discloses a production process for one-step synthesis of brominated SBS, which belongs to the technical field of brominated SBS production, and comprises the steps of: dissolving SBS with an organic solvent, adding a brominating agent diluted with an organic solvent, the brominating agent adopts bromine The mixture of element and tribromide, the tribromide is trimethylphenylammonium tribromide, add catalyst, the catalyst is tin tetrachloride, the bromination reaction temperature is 10-40°C, and the reaction time is 2 ‑8h; decolorize, wash, and crystallize the feed solution after the above reaction, then pour the crystallized material into a centrifuge, wash with water after centrifugation, filter, and dry to obtain the brominated SBS product. In the present invention, bromine and a small amount of tribromide are added as bromination agents in the production process, and the hydrogen bond substitution reaction is suppressed by adding an appropriate amount of catalyst, so that the addition reaction is the main one, the side reactions are reduced, and the product structure is more stable. The thermal stability of the brominated SBS is improved, and the reaction is a one-step production process, which improves the production efficiency.

A hydrosilylation reaction catalyst prepared from: a prescribed transition metal compound such as iron pivalate, cobalt pivalate, iron acetate, cobalt acetate, or nickel acetate; a ligand comprising t-butylisocyanide or another isocyanide compound; and a borane compound, Grignard reagent, alkoxysilane, or other prescribed promoter makes it possible to promote a hydrosilylation reaction under moderate conditions, and has exceptional handling properties and storage stability.

A cobalt complex represented by formula (1), which exhibits excellent catalytic activity in hydrosilylation reactions and is excellent in terms of handleability and solubility in silicones. {In formula (1), R1 to R3 each independently represent a hydrogen atom or a C1-30 monovalent organic group which may have been substituted by a halogen atom and may be separated by one or more atoms selected from among oxygen, nitrogen, and silicon atoms, and at least one pair among R1 to R3 may be bonded together to form a C1-30 bridged substituent which may be optionally separated by one or more atoms selected from among oxygen, nitrogen, and silicon atoms; the L moieties each independently represent an isocyanide ligand represented by the formula CN-R4 (2) (wherein R4 represents a C1-30 monovalent organic group which may have been substituted by a halogen atom and may be separated by one or more atoms selected from among oxygen, nitrogen, sulfur, and silicon atoms); and n is 4}.