19 results about "Laurolactam" patented technology

The invention discloses a nylon 12 material with high gas barrier property, a nylon pipeline and application. The nylon 12 material is prepared from the following raw materials in percentage by weight: 76.0%-90.3% of nylon 12; 0.1 to 0.8 percent of laurolactam; 8%-20% of a grafting toughening agent; 0.1%-1.0% of a lubricant; 0.5-1.2% of an antioxidant and 1-2% of other processing aids. The nylon 12 material disclosed by the invention has excellent gas barrier property and mechanical property, high melt strength and good long-term hydrostatic resistance, and can be applied to sub-high pressure gas pipelines, carbon dioxide pipelines, oil and gas pipelines, hydrogen delivery pipelines and the like.

The present invention relates to an improved process for depolymerizing laurolactam with sulfuric acid. A particularly suitable starting material is poly-laurolactam, which is intended for recycling and which is characterized by a low laurolactam content.

The invention provides nylon 12 with high gas barrier property, a preparation method thereof and a product containing the nylon 12. The nylon 12 with the high gas barrier property comprises a segmented copolymer of a nylon 12 chain segment and a nylon 10I chain segment, and the ratio of the total mass of decamethylene diamine and isophthalic acid used in the preparation process to the mass of laurolactam is 1: (1-3). Compared with a random copolymer of nylon 12 and nylon 10I, the long-chain barrier nylon prepared by introducing a benzene ring-containing nylon 10I chain segment on a main chain of nylon 12 has the advantages that the molecular chain can still keep higher regularity and higher crystallinity, and the long-chain barrier nylon has better barrier performance and is easier to process and form.

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 invention discloses a method for preparing laurolactam from cyclododecanone oxime, which comprises the following steps: diluting a cyclododecanone oxime raw material, mixing with a fluorocarbon auxiliary agent, preheating, enabling the preheated cyclododecanone oxime raw material and concentrated acid to pass through a dynamic mixer and then enter a microchannel for reaction, neutralizing and washing reaction liquid, and separating to obtain a laurolactam product, the reaction conversion rate and selectivity can be effectively enhanced, the stability and safety of device operation are improved, and the product quality is improved.

The invention relates to comb-type nylon 12 resin powder. The comb-type nylon 12 resin powder is prepared from the following components in parts by mole: 10 parts of laurolactam, 40 to 110 parts of water, 0.0005 to 0.1 part of an end-capping reagent, 0.05 to 2 parts of acrylic acid, 0.0005 to 0.5 part of a catalyst A, 0.0001 to 0.5 part of a catalyst B, 0.001 to 2 parts of a chain transfer agent, 0.0001 to 0.1 part of an initiator, 50 to 200 parts of an organic solvent A, 50 to 200 parts of an organic solvent B and 100 to 800 parts of an organic solvent C. The invention further relates to a preparation method of the comb-type nylon 12 resin powder. The PA12 resin provided by the invention has a comb-shaped structure, and compared with nylon 12 resin in the market, due to branching of the structure, the crystallization property of a molecular chain is further reduced, so that the melting-cooling-coating volume change rate of resin powder in the coating process is reduced, the resin powder is more tightly attached to the metal surface, and the PA12 resin has better coating property.

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 invention relates to the field of cable materials, in particular to a nylon sheath material for wires and cables, which comprises nylon 6, nylon 12, a block copolymer compatilizer, an antioxidant and a lubricant. The preparation method of the block copolymer compatilizer comprises the following steps: 1) reacting polylaurolactam with N-benzoyl-laurolactam for 2-3 hours at 100-120 DEG C in a protective gas atmosphere, cooling, and drying to remove unreacted monomers, so as to obtain an activating agent; 2) uniformly mixing the nylon 6 prepolymer and the nylon 12 prepolymer, and adding an activating agent to obtain a mixture; the mixture is subjected to melt copolymerization for 30-60 min at the temperature of 240-260 DEG C, and a nylon 6-nylon 12 alternating block structure is obtained; and 3) carrying out extrusion granulation on the nylon 6-nylon 12 alternate block structure obtained in the step 2), carrying out water cooling, drying, and removing the unreacted homopolymer to obtain the block copolymer compatibilizer. The obtained material has excellent comprehensive properties such as elongation at break, impact strength and bending strength.

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.

A transparent polyamide moulding with high resistance to steam, containing at least one copolyamide with polyamide units AB / AC / D, wherein: (A) is selected as a cycloaliphatic diamine from the group: MACM and PACM; (B) is selected as an aromatic dicarboxylic acid from the group: isophthalic acid (I), naphthalenedicarboxylic acid, and terephthalic acid (T); (C) is selected as an aliphatic dicarboxylic acid from the group: decanedioic acid, undecanedioic acid, dodecanedioic acid, tridecanedioic acid, tetradecanedioic acid, pentadecanedioic acid, hexadecanedioic acid; and (D) is selected as at least one lactam or α,ω-aminocarboxylic acid from the group: laurolactam, undecanolactam, 12-aminododecanoic acid, and 11-aminoundecanoic acid, wherein: the proportions of polyamide units AB are from 30 to 45 mol %, the proportions of polyamide units AC are from 30 to 40 mol %, and the proportions of polyamide units D are from 20 to 32 mol %, and wherein the sum total of polyamide units AB, AC and D is 100 mol %.

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.