4 results about "O-Hydroxybenzoic Acid" patented technology

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.

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 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.