12 results about "Laurolactam" patented technology

An improved process can be used for the acid hydrolysis of polylaurolactam with sulfuric acid. An especially suitable starting material is polylaurolactam which is intended for recycling and which is characterized by a low laurolactam content.

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 present invention relates to the field of thin film materials, and particularly to a toughened high-impact deep-drawing biaxially oriented polyamide film and a preparation method thereof. The film consists of a three-layer structure, which is successively an upper surface layer, an intermediate layer, and a lower surface layer from top to bottom. The upper surface layer includes an anti-sticking masterbatch, poly(ω-aminoundecanoyl), and poly(laurolactam); the intermediate layer includes poly(laurolactam), a nylon copolymer, 1 to 15 parts of N,N-dimethyl-p-toluenesulfonamide, and polyamide 6; the lower surface layer includes an anti-sticking masterbatch, poly(ω-aminoundecanoyl), and poly(laurolactam). The film prepared by the present invention realizes the expected functions of the film through reasonable formulation design, film layer structure design, and specific preparation methods, thereby providing a biaxially oriented polyamide film with excellent comprehensive performance, easy processing, good deep-drawing performance, and good toughness, which is widely used in different packaging fields and has good market application prospects.

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.

Provided are a method of preparing laurolactam including: a) synthesizing laurolactam by Bechmann rearrangement of cyclododecanone oxime under a catalyst system, b) mixing the laurolactam synthesized in a) with a good solvent and removing the catalyst system, and c) mixing the laurolactam from which the catalyst system has been removed in b) with a poor solvent and performing recrystallization, a synthesis device thereof, a laurolactam composition prepared therefrom, and a method of preparing polylaurolactam using the laurolactam composition.

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 discloses a method for preparing nylon 12 powder for rotational molding. The method comprises the following steps: copolymerizing maleic anhydride with olefin monomers in an anhydrous and oxygen-free environment to obtain copolymer A; prepolymerizing laurolactam and an amine end-capping agent in a prepolymerization reactor to obtain prepolymer B; reacting copolymer A, prepolymer B, a catalyst, an antioxidant, and an end-capping agent to produce copolymer C; granulating copolymer C to obtain copolymerized nylon 12 slices, and then cryogenically crushing, separating, drying, and sieving the nylon 12 slices to obtain nylon 12 powder suitable for rotational molding. Copolymerized nylon 12 prepared from maleic anhydride-olefin copolymer and nylon 12 polyamide effectively solves the problem of warping and deformation in rotational molded products.

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.

The present application relates to the field of cable materials, in particular to a nylon sheath material for wires and cables, comprising nylon 6, nylon 12, a block copolymer compatibilizer, an antioxidant, and a lubricant; the preparation method of the block copolymer compatibilizer is as follows: 1) polylaurolactam and N-benzoyl-laurolactam are reacted at 100-120°C for 2-3 hours under a protective gas atmosphere, and then dried to remove unreacted monomers after cooling to obtain an activator; 2) nylon 6 prepolymer and nylon 12 prepolymer are uniformly mixed, an activator is added to obtain a mixture; the mixture is melt copolymerized at 240-260°C for 30-60 minutes to obtain a nylon 6-nylon 12 alternating block structure; 3) the nylon 6-nylon 12 alternating block structure obtained in 2) is extruded and granulated, water-cooled, and then dried to remove unreacted homopolymer to obtain a block copolymer compatibilizer. The obtained material has excellent comprehensive properties of elongation at break, impact strength, and flexural strength.