7 results about "Laurolactam" patented technology

The invention belongs to the technical field of resin gears, and particularly provides a low-friction compound gear as well as a preparation method and application thereof.The low-friction compound gear is prepared by mixing the following raw materials in parts by mass: 50-60 parts of polylaurolactam, 15-20 parts of polyformaldehyde, 2-3 parts of a compatilizer, 2-3 parts of heat conduction fibers, 0.3-0.4 part of a coupling agent, 0.1-0.2 part of a crystal forming agent and 0.01-0.02 part of an antioxidant; the heat-conducting fibers are obtained by etching polyether-ether-ketone fibers and coating and curing the polyether-ether-ketone fibers; the crystal forming agent is obtained by condensation polymerization of p-dichlorobenzene, sodium sulfide and biphenyl derivatives. According to the compound gear prepared by matching the crystal forming agent with the heat-conducting fiber, the crystallinity of the gear product can reach 67.9%, the heat conductivity is greater than or equal to 3.34 W. (m.K)-1, and the mechanical property is excellent.

The invention belongs to the technical field of modified copolymer nylon, and particularly relates to a modified PA6 material and a preparation method thereof. The invention aims to solve the problems that the existing copolymerization modified PA6 material has strong hygroscopicity and does not have high insulativity. Caprolactam and laurolactam are mixed and copolymerized to obtain a PA6 / 12 random copolymer; blending the modified graphene oxide, boron nitride nanosheets and polyamide oligomer in advance to obtain a composite suspension; the PA6 / 12 random copolymer is subjected to surface coating and then fed into an extruder, the composite suspension liquid is added after complete melting, a flame retardant additive is added after uniform mixing, and finally the modified PA6 material is obtained through extrusion. The modified PA6 material prepared by the invention has low water absorption and good insulativity, and is not easy to leak and trace in a high-temperature working scene.

This invention provides a method for producing aminododecanoic acid from laurolactam. The method includes reacting ammonia and a laurolactam solution under a composite catalyst to obtain a product containing aminododecanoic acid. This method uses laurolactam as a raw material and directly produces aminododecanoic acid through high-temperature alkaline ring-opening under the action of a composite catalyst, while simultaneously yielding high-value-added aminododecanoic acid. Furthermore, the product can be promptly removed, avoiding system blockage caused by overheating and coking, thus improving economic efficiency and making it suitable for industrial production.

The application discloses a method for preparing dodecanolactam from cyclododecanone oxime, wherein the cyclododecanone oxime raw material is diluted, mixed with fluorocarbon auxiliary agent, preheated, and then reacted in a microchannel after passing through a dynamic mixer and entering the microchannel, and the reaction liquid is separated into dodecanolactam product after neutralization and water washing; the method can effectively enhance reaction conversion rate and selectivity, improve stability and safety of device operation, and improve product quality.

The application belongs to the technical field of resin gears, and specifically provides a low-friction composite gear, a preparation method and application thereof, which is prepared by mixing raw materials including the following components by mass: poly(lauryl lactam) 50-60 parts, polyformaldehyde 15-20 parts, a compatilizer 2-3 parts, a heat-conducting fiber 2-3 parts, a coupling agent 0.3-0.4 parts, a crystallization agent 0.1-0.2 parts, and an antioxidant 0.01-0.02 parts; the heat-conducting fiber is obtained by etching and glue-curing poly(ether ether ketone) fiber; and the crystallization agent is obtained by polycondensation reaction of p-dichlorobenzene, sodium sulfide and a biphenyl derivative. The composite gear prepared by using the crystallization agent and the heat-conducting fiber has a gear product crystallinity of 67.9%, a thermal conductivity of 3.34 W·(m·K) ‑1 , and excellent mechanical properties.

The present invention relates to cyclododecanone and a preparation method therefor. According to the present invention, a cyclododecanone preparation method capable of achieving a high conversion rate and minimizing unreacted materials and the production of reaction byproducts can be provided. In addition, the present invention implements a high conversion rate and selectivity despite a simplified process, and thus can be helpfully utilized in economical laurolactam production methods that are easy to mass-produce commercially. According to the present invention, the proportions of cyclododecanol, cyclododecadiol, and the like, obtained as reaction byproducts, in the final product can be drastically reduced, and cyclododecanone can be produced at a high conversion rate.

The invention discloses a nylon 12 resin and a preparation method thereof, and a nylon 12 fiber and a preparation method thereof. Preparation raw materials of the laurolactam resin comprise the following components in parts by weight: 100 parts of laurolactam, 0.2-1 part of an end-capping reagent, 4-8 parts of metal salt, 0.1-0.5 part of a catalyst, 0.01-0.05 part of a main antioxidant, 0.01-0.05 part of an auxiliary antioxidant and 5-20 parts of water. The molecular weight distribution (PDI) of the nylon 12 resin is 1.6-1.9, and the prepared nylon 12 fiber has the advantages of few broken ends, high monofilament strength (greater than or equal to 5.5 cN / dtex) and good stretchability, is suitable for spinning of superfine denier specification fiber 30D / 24F, has high color fastness, and is helpful for reducing chromatic aberration and dyeing defect phenomena in the dyeing process.