11 results about "O-Hydroxybenzoic Acid" patented technology

The present invention proposes a method for improving the yield of synthesized vinylene carbonate, comprising the following steps: (1) in an organic solvent, using vinyl chlorocarbonate as a raw material, adding an organic amine dechlorination catalyst to carry out a dechlorination reaction, and adding an inhibitor solution after the dechlorination reaction is carried out for a period of time, and continuing the reaction to prepare a vinylene carbonate crude product; (2) extracting and separating the vinylene carbonate crude product through hot water to obtain a vinylene carbonate product; wherein the inhibitor solution is prepared in advance by dissolving the inhibitor in the solvent, and the inhibitor is one or more of o-hydroxybenzoic acid, m-hydroxybenzoic acid, gentisic acid, and pyrogallol acid. The method according to the present invention can increase the crude yield of VC products synthesized by an intermittent method by ≥95%, and the crude yield of VC products synthesized by a micro-reaction continuously by ≥98%. The present invention is green, economical, safe and efficient, and can significantly improve the current synthesis process level of vinylene carbonate.

The invention relates to the technical field of ceramic glazes, and discloses an anti-glaze-crack antibacterial ceramic glaze and a preparation method thereof.The preparation method comprises the steps that polyethyleneimine and 4-hydroxyphthalic anhydride react to obtain modified polyethyleneimine, then nano titanium dioxide serves as a photocatalytic antibacterial agent and is subjected to ball milling and blending with feldspar, silica powder, calcite and the like, and the anti-glaze-crack antibacterial ceramic glaze is obtained. Glazing and sintering at high temperature to obtain the anti-glaze-crack antibacterial ceramic glaze. A large number of hydroxyl groups, carboxyl groups and o-hydroxybenzoic acid structures are introduced into the modified polyethyleneimine, so that the surface modification and dispersion effects on the nano titanium dioxide are realized, the dispersity of the nano titanium dioxide in the ceramic glaze is improved, more photocatalytic active sites are exposed, and a higher sterilization rate is shown; the modified polyethyleneimine serves as a dispersing agent of the glaze, agglomeration of inorganic particles such as silica powder in the glaze is reduced, the uniformity of the glaze is improved, the quality of a fired glaze surface is improved, and better glaze crack resistance is shown.

The invention provides an aryl phosphate diester compound as well as a synthesis method and application thereof. The synthesis method comprises the following steps: under an inert atmosphere condition, carrying out a first reaction on a first mixed reaction system containing a phosphodiesters compound, thionyl chloride and a catalyst to obtain a phosphoryl chloride compound; under the inert atmosphere condition, a halogenated benzene compound and organic lithium are subjected to a lithium halogen exchange reaction, a second mixed reaction system containing the phosphoryl chloride compound and a product of the lithium halogen exchange reaction is subjected to a nucleophilic reaction, and the aryl phosphate diester compound is obtained. The synthesis method is relatively mild in reaction condition, high in raw material preparation yield and rich in applicable substrate variety. The invention also provides a mixed extraction system taking the o-hydroxybenzoic acid n-octyl ester as the extraction agent and the prepared aryl phosphate diester compound as the synergistic extraction agent, the extraction system is suitable for extracting lithium from an alkaline lithium-containing solution, the configuration of the extraction agent is subjected to enol transformation during extraction, and the lithium extraction rate is relatively high.

The invention discloses a high-performance single-component polyurethane waterproof coating and a preparation method thereof, and the high-performance single-component polyurethane waterproof coating comprises the following components in parts by weight: polyether A, polyether B, an adipic acid polyester plasticizer, a filler, powder, isocyanate, an auxiliary agent A, a catalyst, an auxiliary agent B and a solvent. The auxiliary agent A is 2, 3-dihydroxysuccinic acid or o-hydroxybenzoic acid. The filler is one or two of talcum powder or heavy calcium carbonate. The powder material is nano titanium dioxide. According to the single-component polyurethane waterproof coating adopting a moisture curing system, the coating film has high strength and extensibility, slight base displacement can be resisted, the single component is convenient to use, and working hours are saved; and the extensibility of the coating can be improved by selecting high-functionality and high-molecular-weight polyether. The polyurethane material is a waterproof material, is compact in film formation, and has excellent waterproof performance.

A gold-based alloy solder paste with good dispensing performance, comprising, in mass percentage, 87-93% of gold-based alloy powder, the gold-based alloy powder containing 75-90% of gold; and 7-13% of flux, the flux mainly comprising modified rosin, organic solvent, active agent and thixotropic agent; the modified rosin being hydrogenated rosin and polymerized rosin; the organic solvent being two or more of ethylene glycol, glycerol, isopropyl alcohol, diethylene glycol ethyl ether, propylene glycol methyl ether or dipropylene glycol butyl ether; the active agent being one or more of acetic acid, glutaric acid, o-hydroxybenzoic acid, pimelic acid and heptanedioic acid; and the thixotropic agent being ethylene bis-stearamide and modified fatty acid amide resin; the gold-based alloy solder paste prepared by the application is free of halogen, easy to clean, low in oxygen content, has bright solder joints and high expansion rate, can realize continuous dispensing, and is applied to the field of high-reliability electronic packaging.

This application relates to the technical field of organic synthesis, specifically disclosing a continuous flow microchannel synthesis method for o-hydroxybenzoic acid and its derivatives. The continuous flow microchannel synthesis method for o-hydroxybenzoic acid and its derivatives disclosed in this application employs an integrated microchannel reactor and includes the following steps: using phenol or its derivatives as raw materials, a phenolate reaction is carried out with an alkali metal hydroxide solution in a first microchannel to obtain intermediate 1; CO2 is introduced into intermediate 1, and a carboxylation reaction is carried out in a second microchannel to obtain intermediate 2; intermediate 2 is reacted with a dilute acid solution in a third microchannel to obtain a crude solution; the crude solution is carried into a fourth microchannel for crystallization to obtain the target crystalline form; and the target crystalline form is carried into a fifth microchannel for post-processing to obtain the target product. The synthesis method employed in this application, through continuous reaction, significantly improves the synthesis efficiency and allows for online control of the crystal form.

The invention discloses a synthesis method of a benzofuro [3, 2-b] benzofuran compound, and belongs to the technical field of organic synthesis. According to the method, o-hydroxybenzoate compounds or halogenated derivatives thereof and methyl bromoacetate are taken as starting raw materials, and a target product is prepared through five steps of reaction: step 1, cyclization is performed at 0 DEG C to room temperature under an alkaline condition to obtain a benzofuran carboxylate intermediate; 2, sulfonylating by trifluoromethanesulfonic anhydride to obtain a sulfonate intermediate; 3, carrying out an etherification reaction with an o-halogenated phenol compound at the temperature of 80-120 DEG C; 4, hydrolyzing through inorganic strong base to obtain a benzofuran carboxylic acid intermediate; and 5, carrying out intramolecular ring closing at 80-180 DEG C under the action of a palladium catalyst and DBU. The raw materials are cheap and easy to obtain, the reaction selectivity is high, the total yield is stable, the substrate adaptability is wide, efficient synthesis of unilateral and bilateral halogen substituted derivatives of benzofuro [3, 2b] benzofuran compounds is successfully achieved, and the method has remarkable industrial application value.

The present invention discloses a preparation method of a zinc complex nanomaterial of a substituted o-hydroxybenzoic acid, comprising the following steps: dissolving a substituted hydroxybenzoic acid derivative coordination monomer in a solution of an organic solvent; dispersing an oxide, carbonate, basic carbonate or hydroxide of a coordination metal zinc in an organic solvent system containing water to prepare a dispersion; adding the solution in batches to the dispersion and continuously stirring to obtain a mixed solution; adding an inorganic salt of an alkali metal to the mixed solution, stirring and reacting the mixed solution, and filtering to obtain crystals; placing the crystals in water and continuing to stir until a gel is obtained; filtering the gel to squeeze out water, and then performing air drying to obtain the nanomaterial. The present invention uses the spontaneous intermolecular force during the reaction to replace the high-temperature and high-pressure explosion force for artificially synthesizing nanomaterials or the mechanical force required for crushing large crystals into nanocrystals to obtain a nanomorphological product. The process is simple, safe, low-cost, green and environmentally friendly.

The application belongs to the technical field of electric power insulation equipment, and particularly relates to a bird-repellent silicone rubber composite insulator and a preparation method and application thereof. The bird-repellent silicone rubber composite insulator is characterized in that bird-repellent essential oil microcapsules are uniformly distributed in the heat vulcanized silicone rubber of the outer insulation material. The raw materials of the core material of the bird-repellent essential oil microcapsules include, by weight, phenyl o-hydroxybenzoate, grapefruit peel ethanol extract, cinnamon bark ethanol extract, civetone, quercitrin and dibutyl hydroxytoluene. The bird-repellent essential oil microcapsules are added in the silicone rubber mixing process of the existing silicone rubber composite insulator, so that the existing ordinary silicone rubber composite insulator is endowed with good endogenous bird-repellent function, has broad-spectrum repellence, and has long repellence timeliness, which can be more than 10 years.

The present invention belongs to the field of fine chemical synthesis. A method for synthesizing o-hydroxybenzamide, the process of which includes: step S1, under the action of catalyst A, using o-hydroxybenzoic acid as the initial raw material, and synthesizing o-hydroxybenzoyl chloride in a reactor with a chlorinating agent; the catalyst A is dimethylformamide or dimethylacetamide; step S2, under the action of catalyst B, methanol or ethanol is substituted for chlorine in o-hydroxybenzoyl chloride to synthesize o-hydroxybenzyl ester; the catalyst B is 4-methylpyridine, 2,6-lutidine or pyridine; step S3, under the action of catalyst C, o-hydroxybenzyl ester and ammonia undergo amination reaction to generate o-hydroxybenzamide; the catalyst C is sodium pyrosulfite or ammonium chloride. The new process for synthesizing o-hydroxybenzamide of the present invention has the characteristics of simple operation, safety, environmental protection, low energy, high yield and high purity.

The invention provides sun-proof ink for paper product printing. The ink is prepared from the following raw materials in parts by weight: 30-35 parts of pigment, 28-33 parts of epoxidized soybean oil, 17-23 parts of rosin modified phenolic resin, 10-15 parts of terpene phenolic resin, 6-8 parts of acrylic acid modified alkyd resin, 2-3 parts of a UV absorbent, 0.2-0.5 part of an antioxidant, 18-20 parts of filler, 10-15 parts of a solvent, 1-2 parts of a surfactant, 0.5-1 part of a drying agent and 0.5-1 part of gel. The filler is a blend of nano aluminum oxide powder and organic nano montmorillonite powder in a weight ratio of 1: 1; the solvent is a blend of isoamyl acetate and pentaerythritol in a weight ratio of 1: 1; the UV absorbent is a blend of phenyl salicylate and 2-hydroxy-4-n-octyloxybenzophenone in a weight ratio of 1: 2; the antioxidant is bis (2, 4-di-tert-butylphenyl) pentaerythritol diphosphite ester. The ink disclosed by the invention has a very good sun-proof effect and also has a good printing effect.