6 results about "Lauroyl peroxide" patented technology

The invention discloses an ethylene-vinyl acetate copolymer, an ethylene-vinyl alcohol copolymer and a preparation method thereof, and belongs to the field of polymers. Comprising the following steps: putting a mixture containing an initiator, a chain transfer agent, a solvent and vinyl acetate into a closed container, introducing ethylene gas, and carrying out pressurized polymerization to obtain the ethylene-vinyl acetate copolymer, the initiator is selected from at least one of lauroyl peroxide, benzoyl peroxide, azodiisobutyronitrile and azobisisoheptonitrile; the chain transfer agent is selected from the group consisting of 2-dimethylaminoethyl acetate and / or 2-dimethylaminoethyl propionate. The preparation method of the low-branching-degree EVA has the characteristics of mild conditions, strong controllability, simplicity in operation and large-scale application prospect. The invention also provides an ethylene-vinyl alcohol copolymer prepared from the prepared EVA through alcoholysis reaction, and the ethylene-vinyl alcohol copolymer has the characteristics of high molecular weight, narrow distribution, good appearance and the like, and meets the application requirements of commercial EVOH.

The invention belongs to the technical field of oil exploitation, and discloses a plugging agent for rebuilding a shaft of a low-efficiency horizontal well and a preparation method of the plugging agent, the plugging agent is prepared from the following raw materials in parts by weight: 100 parts of water, 26-31 parts of a composite monomer, 0.35-0.55 part of a functional monomer, 0.012-0.016 part of an initiator, 0.9-1.3 parts of a cross-linking agent and 0.055-0.075 part of a stabilizer; the composite monomer is a mixture of acrylamide and 2-acrylamido-2-methyl-1-propanesulfonic acid, and the composite monomer is a mixture of acrylamide and 2-acrylamido-2-methyl-1-propanesulfonic acid; the functional monomer is a mixture of 1-vinyl imidazole and N-vinyl caprolactam; the initiator is prepared by mixing sodium azodiisobutyramide propanesulfonate and lauroyl peroxide. According to the invention, the azodiisobutyramide sodium propanesulfonate and the lauroyl peroxide are compounded and synergistically realize uniform monomer polymerization and dense gel.

The invention relates to application of a polycyclic quinazolinone compound in resisting plant pathogenic fungi in the technical field of organic synthetic chemistry and agricultural pharmacology, the structural formula of the derivative is shown as I or II, in the structural formula, R is H, 4-OMe, 4-Me, 4-CO2Me, 4-F, 4-CF3, 4-Cl, 4-Br, 2-Br or 2-F, and R is H, 4-OMe, 4-Me, 4-CO2Me, 4-F, 4-CF3, 4-Cl, 4-Br, 2-Br or 2-F; the series of compounds have a certain inhibition effect on plant pathogenic fungi including strawberry botrytis cinerea, fusarium graminearum, rhizoctonia solani and magnaporthe oryzae, and can be applied to plant protection as a bactericide. The preparation method comprises the following steps: by taking N-cyanamide olefin as a raw material and lauroyl peroxide as an oxidizing agent, reacting in a dichloromethane or trichloromethane solvent at 80-120 DEG C to obtain the polycyclic quinazolinone compound with antibacterial activity. The preparation method is simple to operate, green and efficient.

This invention belongs to the field of peroxide production technology, specifically relating to a continuous production apparatus and method for lauroyl peroxide. The continuous production apparatus for lauroyl peroxide includes a primary reactor, to which a secondary reactor, a tertiary reactor, and a filter tank are sequentially connected. Each of the primary, secondary, and tertiary reactors is equipped with a stirrer, with a spiral plate threaded onto its upper part. A motor is connected to the top of the stirrer. A conveyor belt is installed inside the filter tank, and a mother liquor outlet is located in the center of the bottom plate. The bottom plates on both sides of the mother liquor outlet are inclined. A primary washing tank, a secondary washing tank, and a tertiary washing tank are sequentially connected to the filter tank. Each of the primary, secondary, and tertiary washing tanks is equipped with a filter screen and a sprayer. This invention employs a multi-reactor series continuous production process, resulting in higher production efficiency and more stable operation.

The invention belongs to the technical field of peroxide production, and particularly relates to a lauroyl peroxide continuous production device and a preparation method.The lauroyl peroxide continuous production device comprises a first-stage reaction kettle, and the first-stage reaction kettle is sequentially connected with a second-stage reaction kettle, a third-stage reaction kettle and a filter tank; the first-stage reaction kettle, the second-stage reaction kettle and the third-stage reaction kettle are internally provided with stirrers, the upper parts of the stirrers are in threaded connection with spiral plates, the tops of the stirrers are connected with motors, the filter tank is internally provided with a conveying belt, the middle part of a bottom plate of the filter tank is provided with a mother liquor outlet, and the bottom plates on the left and right sides of the mother liquor outlet are obliquely arranged; the filter tank is sequentially connected with a first-stage washing tank, a second-stage washing tank and a third-stage washing tank, and filter screens and sprayers are arranged in the first-stage washing tank, the second-stage washing tank and the third-stage washing tank. The continuous production process with multiple kettles connected in series is adopted, the production efficiency is higher, the operation is more stable, and the multiple kettles are connected in series for operation.

Provided is a method for producing an ethylene-vinyl ester copolymer, in which coloration due to thermal degradation can be suppressed in a saponified ethylene-vinyl ester copolymer. The method for producing an ethylene-vinyl ester copolymer by copolymerizing a vinyl ester monomer and ethylene, wherein the polymerization activity of the vinyl ester monomer, as measured using the measurement method described below, is 550 seconds or more.　Measurement method: a glass test tube containing 10 mL of a vinyl ester monomer and 0.130 g of lauroyl peroxide as a polymerization catalyst is immersed in a constant temperature bath at 20°C, the polymerization catalyst is dissolved in the vinyl ester monomer, the number of seconds between a point when the test tube is immersed in a constant temperature bath at 65.0ºC and a point when foam is generated and the height from the surface of a foam layer to the bottom of the foam layer is 3 mm or more is measured, and this number of seconds is taken to be the polymerization activity.