71 results about "Nylon 12" patented technology

The invention provides bio-based nylon 12 and a preparation method thereof. The preparation method comprises the following steps: a) adding 12-amino dodecanoic acid inner salt, a catalyst, an antioxidant and a molecular weight regulator into a reaction kettle, filling inert shielding gas into the reaction kettle, and carrying out prepolymerization reaction to obtain a prepolymer; b) performing condensation polymerization on the prepolymer obtained in the step a) to obtain a condensation polymer; and c) sequentially carrying out melt blending, extrusion, cooling and granulation on the polycondensate obtained in the step b) to obtain the bio-based nylon 12. Compared with the prior art, the preparation method provided by the invention has the advantages that the bio-based nylon monomer 12-amino dodecanoic acid inner salt is adopted as a raw material and is matched with other raw material components, polymerization is carried out under specific process steps, overall better interaction is realized, and the prepared ultra-high molecular weight full bio-based nylon 12 is high in product molecular weight, free of coking and good in comprehensive performance.

The invention discloses a high-toughness biaxially oriented nylon film and a production method thereof. Comprising the following raw materials in parts by weight: 40-50 parts of copolymerized nylon resin, 10-20 parts of nylon 12, 15-25 parts of thermoplastic polyamide elastomer, 3-6 parts of nanofiller, 1-3 parts of coupling agent, 10-20 parts of reinforced fiber, 5-8 parts of additive, 3-7 parts of ethylene-methyl acrylate-glycidyl methacrylate terpolymer and 6-10 parts of modified cellulose nanocrystal. The invention relates to a flame-retardant polyamide resin, which is prepared from the following components in parts by weight: 2-4 parts of amino-terminated hyperbranched polyamide and 1-3 parts of 3, 3 '-diamino-4, 4'-difluorodiphenyl sulfone. The film is high in tensile strength, good in tear resistance and excellent in barrier property and low-temperature impact resistance.

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 invention discloses a high-impact precipitation-resistant halogen-free flame-retardant modified nylon 12 material and a preparation method thereof. The nylon 12 material is prepared from the following components in parts by weight: nylon 12 with specific end group content, in-situ grafting toughening agent master batch, in-situ fiber forming flame retardant master batch and 0 to 4 parts of processing aid. The preparation method of the in-situ grafted toughening agent master batch is adopted, the nylon 12 resin with specific end group content is matched, and after the in-situ reaction of the high-content polar monomer of the grafted toughening agent and the amino group at the end of the nylon 12 is complete, a considerable number of polar groups are still reserved to be chemically bonded with the amino group in an MCA compound system; the dispersion condition of the flame retardant in the nylon 12 resin is effectively improved; meanwhile, the acrylic acid modified polytetrafluoroethylene forms a microfibrillated network in situ in the mixing process of the continuous internal mixer, precipitation of a flame retardant can be inhibited, the material is endowed with an anti-dripping characteristic, and finally the halogen-free flame-retardant modified nylon 12 material with high impact and precipitation resistance characteristics is obtained.

The invention discloses a bio-based nylon 12 elastomer prepared by a one-step method and a preparation method and application thereof, and belongs to the technical field of polyamide materials, the method comprises the following steps: (1) material preparation: mixing, heating and uniformly stirring bio-based 12-amino dodecanoic acid, polyether amine, a reaction aid and water in a material preparation tank to form a mixture; (2) feeding: pressing the mixture into a polymerization kettle through nitrogen pressurization; and (3) polymerizing. By optimizing the raw material combination and the polymerization process path, the one-step method (namely, in the same polymerization kettle) is realized to complete the polymerization reaction taking the bio-based 12-amino dodecanoic acid monomer as the main component, and the polyether block amide type nylon 12 elastomer is constructed, so that the elongation at break and the rebound resilience are improved, the stable polymerization process and the controllable product quality are realized, and the production cost is reduced. And the polyurethane elastomer has good elasticity and machinability, and is suitable for the fields of soles, sealing strips, soft devices and the like.

A cam follower adapted for use in connection with a turntable assembly includes a common support shaft having a longitudinal axis and first and second roller assemblies, each having an outer tire portion and an inner bearing portion. The outer tire portions have curved outer peripheries shaped as truncated spheres, spheroids or ellipsoids, are rotatable about the longitudinal axis independently of one another, and are formed from a polymer material, such as polyimide, polyaryletherketone (PAEK), acetal, cast nylon 12 or cast nylon 6. The outer tire portion of the first roller assembly is adapted to be positioned a first radial distance, and the outer tire portion of the second roller assembly is adapted to be positioned a second radial distance, from the axis of rotation of the turntable assembly, the second radial distance being different than the first radial distance.

The invention discloses a high-strength rat-proof optical cable and a preparation method thereof. The high-strength rat-proof optical cable comprises at least one reinforcing piece, at least one cable core distributed outside the reinforcing piece, an inner protective layer wrapping the cable core, an armor layer wrapping the inner protective layer and a rat-proof outer sheath wrapping the armor layer, and the cable core is composed of at least one optical fiber and a loose tube; wherein the rat-proof outer sheath is prepared from the following raw materials in parts by weight: 70 to 80 parts of linear low-density polyethylene, 20 to 30 parts of nylon 12, 5 to 8 parts of compatilizer, 15 to 20 parts of modified composite filler, 1 to 3 parts of antioxidant and 0.5 to 1 part of lubricant. According to the high-strength rat-proof optical cable, the LLDPE / nylon 12 alloy matrix with a specific formula is adopted in the outer sheath, and the modified composite filler is introduced, so that the finally prepared optical cable outer sheath has excellent mechanical strength and wear resistance, and an efficient, long-acting and environment-friendly biological rat-proof effect is achieved.

The invention provides a nylon 12 fiber easy to dye and a preparation method thereof. The fiber comprises nylon 12 resin and a dyeable agent, and the content of amino-terminated groups of the nylon 12 resin is 2-5 times of the molar content of carboxyl-terminated groups. The preparation method comprises the following steps: mixing, extruding and granulating, melting and spinning, stretching and shaping and post-processing. The nylon 12 fiber is easy to dye and high in color fastness.

The invention discloses an in-situ grafted toughening agent master batch and a preparation method thereof, and a high-impact hydrolysis-resistant reinforced nylon 12 material and a preparation method thereof. The in-situ grafted toughening agent master batch comprises the following raw materials in parts by weight: 40-80 parts of nylon 12 resin; 10 to 40 parts of a toughening agent; 1-4 parts of a grafting monomer; 0.1 to 0.5 part of an initiator; 0-3 parts of a processing aid; the glass fiber reinforced nylon 12 composite material can be used for reinforcing modification of a nylon 12 material, has a relatively high glass fiber retention length, can effectively improve normal and low temperature impact performance on the premise of not influencing tensile strength and modulus, and shows a more excellent performance retention rate after aging in a high-temperature cooling liquid.

The invention provides nylon 12 modified plastic as well as a preparation method and application thereof. The preparation raw materials comprise 60-98 wt% of nylon 12, 0-14 wt% of a liquid plasticizer, 1-20 wt% of a solid toughening agent, 0.1-1 wt% of a solid antioxidant, 0.1-1 wt% of a heat stabilizer, 0-1 wt% of a light stabilizer, 0-2 wt% of a coloring agent and 0.03-1 wt% of a liquid descaling agent. And the neck mold scale cleaning times are reduced, the possibility of generating large-particle impurity points is reduced, the neck mold scale cleaning time is prolonged, the product quality is improved, and the method is suitable for the fields of automobile pipeline preparation and the like.

The present invention discloses an anti-collapse PBT / PA12 sharpened toothbrush filament and its preparation method. The raw materials contain the following components by weight: 60-90 parts of polybutylene terephthalate (PBT), 10-40 parts of nylon 12 (PA12), 1-5 parts of amphiphilic block copolymer, 0.1-0.5 parts of antioxidant, and 0.1-0.5 parts of lubricant. The amphiphilic block copolymer used in the present invention is a block copolymer formed by the amidation reaction of a dicarboxyl-terminated polybutylene terephthalate oligomer and a diamino-terminated nylon 12 oligomer. This amphiphilic block copolymer can effectively improve the compatibility of PBT and PA12, and achieve the submicron-sized dispersion of the PA12 dispersed phase in the PBT matrix. A kind of anti-collapse PBT / PA12 sharpened toothbrush filament is prepared by melt spinning and filament cake sharpening of the blend.

The present application discloses a one-step preparation of bio-based nylon 12 and its preparation method and application, belonging to the technical field of polyamide materials. The method comprises the following steps: (1) material preparation: mixing bio-based 12-aminododecanoic acid, water and reaction aids in a material preparation tank to form a suspension; (2) feeding: adding the suspension to a polymerization kettle by nitrogen pressurization; (3) polymerization: performing the following operations in sequence through a control system: temperature and pressure increase, constant temperature and pressure maintenance, temperature and pressure reduction, constant temperature and pressure, constant temperature and vacuum, nitrogen pressurization, water cooling and pelletizing to obtain bio-based nylon 12. The present application achieves a one-step process for polymerizing nylon 12 using bio-based 12-aminododecanoic acid as a monomer by comprehensive optimization of the process flow and precise control of key nodes, while matching specific reaction aids. This process not only enables continuous production, but also achieves precise control of the molecular weight distribution of the polymer, resulting in a narrow molecular weight distribution and uniform product viscosity.

The present invention provides a bonded magnet having good heat resistance. The present invention relates to a bonded magnet containing a SmFeN magnetic powder, nylon 12, and a hexafluoroisopropanol-unextractable component. The present invention also relates to a method of preparing a bonded magnet, including: bringing a raw material bonded magnet containing a SmFeN magnetic powder and nylon 12 into contact with an amorphizing agent; and heat-treating the raw material bonded magnet in contact with the amorphizing agent.

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.

The utility model discloses a high pressure fast -charging female row for new energy automobile. The female row includes metal conductor and the insulating layer of cladding metal conductor surface, the insulating layer material is one or more of nylon 12, modified nylon 12. Can solve with temperature promotion, and the problem of the peeling of insulating layer caused by the insufficient adhesion between insulating layer and conductor, improves the heat resistance of insulating layer material.

The application discloses a kind of injection molding magnetic ferrite composite material and preparation method thereof, by following weight percentage component composition: modified ferrite magnetic powder 82%-90%, composite binder 7%-15%, coupling agent 0.3%-0.8%, lubricant 0.5%-1.2%, antioxidant 0.2%-0.5%, reinforcing agent 0.3%-1.0%;The composite binder is mixed by nylon 6, nylon 12 and polyphenylene sulfide according to weight ratio 2:1:0.5-1, the injection molding magnetic ferrite composite material and preparation method thereof, make composite material have good injection molding fluidity, can be prepared shape complex, size tiny magnetic component device, forming precision is high, without subsequent processing, further improve production efficiency, reduce production cost.

The invention provides nylon 12 granules capable of stabilizing and controlling the pipe processing wall thickness and a preparation method and application of the nylon 12 granules. The nylon 12 granules comprise nylon 12 matrix granules and higher fatty acid metal salt wrapping the surfaces of the nylon 12 matrix granules. The higher fatty acid metal salt accounts for 0.03-0.5% of the total mass of the nylon 12 granules, and preferably 0.05-0.3% of the total mass of the nylon 12 granules. According to the invention, the surface of the nylon 12 granular material is uniformly coated with a certain content of higher fatty acid metal salt powder, so that a nylon 12 pipe product with stable and controllable pipe processing wall thickness can be obtained. The method has the characteristics of good pipe continuous extrusion stability, high wall thickness uniformity and high extrusion linear speed, and has the advantages of simple forming process, low equipment investment and the like.

Provided is an engineered bacterium for inhibiting the synthesis of dodecanedioic acid. The expression of a related redox gene is knocked out or down-regulated in the genome of the engineered bacterium. The engineered bacterium can effectively reduce the production of the by-product dodecanedioic acid and prevent the peroxidation of 12-hydroxydodecanoic acid during the synthesis of nylon 12 monomer. Further provided is a method for constructing an engineered bacterium for inhibiting the synthesis of dodecanedioic acid. The method involves synthesizing nylon 12 monomer in Escherichia coli by using a quorum-sensing system in Vibrio fischeri. The established Escherichia coli containing a self-induction system can produce the nylon 12 monomer from glucose, and the generation of the by-product dodecanedioic acid can be effectively reduced. After fermentation in a shake flask for 72 h, the yield of the nylon 12 monomer is more than 100 mg / L, and the yield of the by-product dodecanedioic acid is reduced to less than 200 mg / L (the proportion in the product is less than 20%).

The invention relates to a PA12 / PA6 parallel composite elastic fiber and a preparation method thereof. Nylon 12 is adopted as a high-shrinkage component, PA6 is adopted as a low-shrinkage component, parallel compounding is achieved, industrial production with high spinning speed and no yarn breakage can be achieved, and real production significance is achieved. Meanwhile, the PA12 / PA6 parallel composite elastic fiber is excellent in elastic property, low in modulus, soft and skin-friendly, has excellent dyeing property in an acid dye system, and provides a new solution for elastic high-end fabric.

The present invention relates to a catheter specially used for aspirating thrombus at the distal end of cerebral blood vessels, which is composed of a catheter seat, a stress release tube and a tube body. The main part of the tube body is composed of three layers, namely, an inner layer, a braided layer and an outer layer. The outer layer material is designed in sections, which is designed according to the physiological and anatomical structure of cerebral blood vessels and provides corresponding flexibility according to different sections of blood vessels. The catheter is mainly made of one or more of nylon 12, PEBAX and TPU polyester materials which cooperate with each other. The outer layer material of the catheter of the present invention is segmented according to the physiological and anatomical structure of cerebral blood vessels and provides corresponding flexibility and pushing performance according to different sections of blood vessels, so that the catheter can effectively adapt to the blood vessel structure and facilitate the catheter to reach the lesion position.

The invention provides Escherichia coli for producing a nylon 12 monomer. The genotypes of the Escherichia coli are as follows: tesA: PtluxR-PluxluxIUcfatB, adhE: PtluxR-PluxluxIUcfatB, fadE: PluxCYP153A-BM3, pgi: PluxCYP153A-BM3, aldB: PluxCYP153A-BM3, and gabD: PM12CV2025BsADH. The invention also provides a preparation method of the Escherichia coli. The genotypes of the Escherichia coli are as follows: tetluxR: PtluxR: PluxluxIUcfatB, adhE: The invention further provides a construction method of the escherichia coli for producing the nylon 12 monomer, a self-induction system in the escherichia coli is constructed by utilizing a Lu xI / R quorum sensing system in vibrio fischeri, and the synthesis rate of AHL is slowed down, so that the self-induction expression of the gene is realized. An engineering escherichia coli strain is constructed based on an established self-induction system, self-induction synthesis of the nylon 12 monomer can be realized, cell growth and product synthesis are balanced, and synthesis of the nylon 12 monomer from glucose is realized.

The utility model provides a kind of underwater liquid oxygen gas explosion fracturer, including fracturer, liquid injection pipe, exhaust pipe, electric ignition device and biomass fuel core body, fracturer is equipped with biomass fuel core body, the material of fracturer is high molecule, high density polyethylene and nylon 12 thermoplastic material, fracturer is equipped with two and above pipe cap, fracturer has waterproof seal, electric ignition device is equipped with electric ignition head and electric ignition lead, fracturer structure uses two pipe caps, wherein pipe cap and liquid injection hole correspond with fracturer, operability is extremely strong, the fracturer of welding seal assembly completion is safe and reliable, it is a kind of simple and easy to use, reliable and efficient, economic and applicable underwater liquid oxygen gas explosion fracturer.

The application discloses a kind of high-strength rat-proof optical cable and preparation method thereof, including at least one reinforcing member, at least one cable core distributed outside the reinforcing member, an inner protective layer coated outside the cable core, an armored layer coated outside the inner protective layer, a rat-proof outer sheath coated outside the armored layer, wherein the cable core is composed of at least one optical fiber and loose tube;Wherein, by weight parts, the rat-proof outer sheath is made of the following raw materials: linear low density polyethylene 70-80 parts, nylon 12 20-30 parts, compatibilizer 5-8 parts, modified composite filler 15-20 parts, antioxidant 1-3 parts, lubricant 0.5-1 part.The high-strength rat-proof optical cable uses LLDPE / nylon 12 alloy matrix with a specific formula in the outer sheath, and introduces modified composite filler, so that the finally prepared optical cable outer sheath not only has excellent mechanical strength, wear resistance, realizes efficient, long-acting and environment-friendly biological rat-proof effect.

The application discloses a nylon 12 modified material resistant to high and low temperature impact and a preparation method and application thereof. The modified material comprises the following components in parts by weight: 48-85 parts of nylon 12, 10-30 parts of in-situ grafted temperature-resistant impact master batch, 5-20 parts of transparent nylon and 0-2 parts of processing aid; wherein the in-situ grafted temperature-resistant impact master batch comprises the following components in parts by weight: 50-88 parts of nylon 12, 10-40 parts of non-polar elastomer, 0.4-4 parts of grafted monomer, 0.1-0.4 parts of initiator and 0-2 parts of processing aid. The application can significantly improve the stability and durability of the nylon 12 modified material under high and low temperature impact cycles, and as a metal insulation layer coating material, the application can not have problems such as cracking in the process of more than 600 high and low temperature impact cycles.

The instant disclosure relates to textile materials having an acid reactive functionalized polymer layer and a non-acid reactive functionalized layer coupled thereto. The acid reactive functionalized polymer layer may include: a polyamide polymer that captures and neutralizes acidic molecules; a hydrophilic polyether block amide copolymer; a maleic anhydride-grafted ethylene copolymer; and a non-halogenated flame retardant. The acid reactive functionalized polymer layer is fire resistant, acid neutralizing, and allows water vapor to transfer therethrough. The non-acid reactive functionalized layer and acid reactive functionalized polymer layer are free of per- and polyfluoroalkyl substances. The polyamide may include Nylon 12, Nylon 6, or Nylon 6,6 functionalized with an amine (e.g., a pyridine derivative and / or a halogenated-dimethylalkylamine) having a nitrogen that captures and neutralizes acidic molecules. The halogenated-dimethylalkylamine may include a general chemical formula of (CH3)2N—R—X, where R is an alkyl containing 1-12 carbon atoms, and X is chlorine or bromine.

The invention provides an underwater liquid oxygen explosion fracturing device and a manufacturing process thereof, the underwater liquid oxygen explosion fracturing device comprises a fracturing device, a liquid injection pipe, an exhaust pipe, an electric ignition device and a biomass fuel core body, the biomass fuel core body is arranged in the fracturing device, the fracturing device is made of a macromolecule, high-density polyethylene or nylon 12 thermoplastic material, the fracturing device is provided with two or more pipe caps, and the pipe caps are arranged in the fracturing device. The cracking device has waterproof sealing and is good in air tightness, the electric ignition device is provided with an electric ignition head and an electric ignition wire, the gas explosion operation efficiency is high, the operability is extremely high, and the assembled cracking device is safe, reliable, good in gas explosion effect, low in blasting vibration and water impact breaking strength and small in influence range. Toxic and harmful blasting products are few, and the underwater reef blasting construction technology is environmentally friendly, efficient and safe.

The application provides a high gas barrier nylon 12, a preparation method thereof and an article containing the high gas barrier nylon 12. The high gas barrier nylon 12 comprises a block copolymer of nylon 12 segments and nylon 101 segments, wherein the mass ratio of the total mass of decanediamine and isophthalic acid to the mass of dodecanolactam used in the preparation process is 1:1-3. The long-chain barrier nylon is prepared by introducing the nylon 101 segments containing benzene rings into the main chain of the nylon 12. Compared with a random copolymer of the nylon 12 and the nylon 101, the molecular chain of the long-chain barrier nylon can still maintain higher regularity, and the crystallinity is higher; therefore, the long-chain barrier nylon is easier to be processed and molded while having better barrier performance.

The invention discloses a multi-layer composite hot melt adhesive film and a preparation process thereof and a composite board, and relates to the field of adhesives, the multi-layer composite hot melt adhesive film comprises a low-temperature layer, a high-temperature layer and a core layer, the low-temperature layer is used for being bonded with PET, the high-temperature layer is used for being bonded with metal, the core layer is used for being bonded with the low-temperature layer and the high-temperature layer, the low-temperature layer is a modified polyolefin hot melt adhesive film, and the high-temperature layer is a modified polyolefin hot melt adhesive film. The high-temperature layer is a polyolefin hot melt adhesive film; the core layer comprises the following raw materials in parts by weight: 26-32 parts of ethylene-vinyl acetate copolymer; 40 to 48 parts of an amorphous plastomer APAO; 2-4 parts of a polypropylene-alkenyl-containing epoxy compound copolymer; 5-8 parts of nylon type copolyamide; 1 to 3 parts of a silane coupling agent KH-550; the nylon type copolyamide is a polymer of nylon 12 and caprolactam. According to the prepared hot melt adhesive film, the PET layer and the metal plate are bonded together, the bonding strength is high, and water resistance, high temperature resistance and corrosion resistance are achieved.

The invention belongs to the technical field of textile preparation, and particularly relates to a nylon 12 fiber and a preparation method and application thereof. The nylon 12 fiber is prepared from the following raw materials in parts by mass: 98 to 100 parts of nylon 12 resin and 0 to 2 parts of auxiliaries, the nylon 12 resin is amino-terminated, and the amino-terminated content is 10-110 mmol / kg. The nylon 12 resin is adopted as an amino-terminated polymer, and the amino-terminated content meets the range, so that dyeing sites can be increased, molecular chain regularity can be reduced, an amorphous region can be increased, dye, especially acid dye, can be conveniently dyed, the dye-uptake and color fastness can be remarkably improved, the dye-uptake can reach 95% or above, and the color fastness can reach 95% or above. The color fastness to washing and the color fastness to perspiration can reach grade 4-5 and the like, good mechanical properties are kept, the application requirements of high-end garment materials are met, and the long-acting antibacterial performance is excellent.

The invention relates to the technical field of medical polymer materials, and particularly discloses a nylon material for a medical catheter as well as a preparation method and application of the nylon material. The nylon material for the medical catheter is mainly prepared from the following raw materials in percentage by weight: 80-90% of nylon resin, 8-12% of organic grafted SEBS (Styrene-Ethylene-Butylene-Styrene) and 2-8% of an anticoagulant, the nylon resin is selected from nylon 12 and nylon 6, and the weight ratio of the nylon 12 to the nylon 6 is (6-8): (2-4); the organic grafted SEBS is obtained by treating SEBS resin by adopting maleic anhydride, 2-acrylamido-2-methylpropanesulfonic acid and hydroxyethyl methylacrylate. Through mutual cooperation of the raw materials, the nylon material has the advantages of high tensile strength, high elongation at break, good anticoagulation performance, good platelet adhesion resistance and high biological safety, achieves balance in mechanical properties, blood compatibility and biological safety, and meets the requirements of medical catheters.