6 results about "Dimethyl glutarate" patented technology

SOLVENT COMPOSITIONS The present invention relates to a solvent composition for solvent-based paints or other coatings characterized in that it comprises a combination of dimethyl glutarate and at least one other compound selected from isobutyl acetate, ethyl lactate, dimethyl 2-methylglutarate, 2-methyltetrahydrofuran, ethyl acetate, cyclopentyl methyl ether, dithoxymethane, dimethyl carbonate, dimethyl succinate, benzyl alcohol, dimethyl adipate, and glyceryl triacetate. Fig. 1

This invention provides a continuous preparation method for dimethyl 2-methylglutarate, carried out in a first microchannel reactor and a second microchannel reactor connected in series. The method includes: feeding 2-methylglutaronitrile and sulfuric acid solution into the first microchannel reactor for hydrolysis; and contacting them with methanol in the second microchannel reactor for esterification. The esterified material is then subjected to phase separation to obtain dimethyl 2-methylglutarate. The mass ratio of 2-methylglutaronitrile to sulfuric acid solution is 1:(5~20). The controlled temperature of the first microchannel reactor is 80~120℃; the controlled temperature of the second microchannel reactor is 65~105℃, and the controlled temperature of the second microchannel reactor is not higher than that of the first microchannel reactor; the mass ratio of 2-methylglutaronitrile to methanol is 1:(1~6). Through the synergistic operation of the microchannel reactor and multiple control parameters, the eutectic precipitation of intermediate products with ammonium sulfate can be avoided, clogging can be prevented, and efficient, high-yield continuous preparation can be achieved.

The application relates to the technical field of electronic equipment, in particular to an ink, a preparation method thereof, a camera decoration assembly, a shell and an electronic equipment. The ink comprises a main agent, a pigment filler, a diluent and a curing agent; the main agent comprises a main body resin, and the main body resin comprises the following components in parts by mass: 60-80 parts of methyl methacrylate; 1-3 parts of bisphenol A diglycidyl ether; and 6-10 parts of dimethyl glutarate. The above ink can solve the problem that ultraviolet light cannot penetrate the shielding layer to cure the ultraviolet curing glue.

The application discloses a kind of green enzymatic polycondensation synthesis polyamide 6,5 method, with dimethyl glutarate and 1,6-hexanediamine as raw material, using Novozym435 immobilized lipase as biological catalyst, by direct enzymatic polycondensation reaction preparation biobased polyamide 6,5.The method uses toluene as reaction medium, combined with vacuum by-product, molecular sieve water absorption balance control strategy, realizes the green efficient synthesis of polyamide 6,5, product has excellent thermal stability (melting point 221 DEG C, maximum decomposition temperature 434 DEG C), suitable for melt spinning and other industrial processes, compared with traditional chemical synthesis method, greatly reduce energy consumption, reduce the use of toxic chemicals, provide a new way for the green manufacturing of polyamide.

The application discloses a preparation method of 2-methyl glutaric acid dimethyl ester, which comprises the following steps: taking methyl acrylate as a starting material, firstly adding to obtain an intermediate 2-methylene glutaric acid dimethyl ester, and then catalytically hydrogenating to obtain 2-methyl glutaric acid dimethyl ester; the catalyst used in the addition reaction is a composite catalyst of tributyl phosphine and 18-crown-6 ether-6; the amount of tributyl phosphine is 1-10% of the weight of methyl acrylate; the amount of 18-crown-6 ether-6 is 0.1-5% of the weight of methyl acrylate; and the molar ratio of tributyl phosphine to 18-crown-6 ether-6 is 1:0.1-1:0.3. The addition reaction of the application adopts a composite catalyst composed of a small amount of 18-crown-6 ether-6 and tributyl phosphine; the composite catalyst has high catalytic activity, can obtain high reaction conversion rate, and has low by-product content, so that the reaction yield is high; in particular, the price of the composite catalyst is obviously lower than that of a diamino phosphine catalyst, so that the production cost is obviously reduced.

An aqueous suspension or colloid composition comprising dimethyl glutarate, a further dialkyl ester which is not a sugar ester or dimethyl glutarate, a glycoside surfactant, an essential oil, and a su