56 results about "Nylon 12" patented technology

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.

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 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 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 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 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 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.

The application belongs to the technical field of optical fiber preparation equipment, and discloses a coating device for preparing invisible optical fiber based on nylon 12. The coating device for preparing invisible optical fiber based on nylon 12 comprises an outer protective shell, a feeding port and a discharging port are arranged on the left side and the right side of the outer protective shell respectively, a rotating drum is movably connected to the middle part of the outer protective shell, and a driving motor is fixedly connected to the outer side of the outer protective shell through a mounting plate. The coating device for preparing invisible optical fiber based on nylon 12 is used in cooperation with a nozzle assembly by using a spraying mechanism, the driven gear and the rotating drum are rotated by driving the driving motor, the coating box, the spraying pipe and the nozzle are rotated, the nozzle is rotated around the optical fiber, the uniformity of spraying is improved, after the nozzle assembly absorbs waste gas and solution vapor, the spraying effect is further improved by further sucking the waste gas and the solution vapor into the spraying pipe through a vacuum air extractor and discharging the waste gas and the solution vapor and pressurizing the nozzle, so that the spraying is more uniform and the spraying effect is improved.

The invention discloses a rat-proof optical cable with a composite outer sheath having color stripes and a preparation method thereof. The rat-proof optical cable comprises a composite outer sheath comprising a tightly integrated inner PE sheath, an outer nylon sheath, and an outer nylon color stripe. The composite outer sheath is formed in one step by a three-layer co-extrusion process. The PE material forming the inner PE sheath contains maleic anhydride, wherein the mass ratio of maleic anhydride to PE is 18-20:80-82. The nylon material forming the outer nylon sheath is black nylon 12 material. The nylon material forming the outer nylon color stripe is nylon 12 material containing a preset proportion of masterbatch. The present invention provides a method for preparing a rat-proof optical cable with a composite outer sheath having color stripes. The sheath is formed in one step by a three-layer co-extrusion process. During production, maleic anhydride is added to the PE material of the inner sheath, so that the inner PE sheath and the outer nylon sheath are not easily delaminated. The color stripes formed by the nylon 12 material containing a preset proportion of masterbatch are not easy to fall off, which can effectively prevent the color strips from falling off, and the cable has both rat-proofing and easy-to-identify properties.

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 relates to recombinant bacteria as well as a construction method and application thereof. The recombinant strain takes escherichia coli as a starting strain, and a UcfatB gene, a CYP153A-BM3 gene, a dehydrogenase gene and a transaminase gene are integrated on a genome. In the recombinant strain, escherichia coli is taken as a starting strain, a UcfatB gene, a CYP153A-BM3 gene, a dehydrogenase gene and a transaminase gene are integrated on a genome of the escherichia coli, a pgi gene on the genome is knocked out, acetyl coenzyme A is synthesized into dodecanoic acid under the UcfatB, the dodecanoic acid is changed into 12-hydroxydodecanoic acid under the catalysis of CYP153A-BM3, and the dodecanoic acid is converted into 12-hydroxydodecanoic acid under the catalysis of CYP153A-BM3. 12-hydroxylauric acid is finally changed into a nylon 12 monomer under the action of dehydrogenase and transaminase. Through gene modification of escherichia coli, the nylon 12 monomer is produced by means of gene engineering, culture conditions are mild, and the method is environment-friendly.

This invention relates to the field of chemical fiber technology, specifically to a high-amino nylon 66 fiber and its preparation process, comprising: S1 synthesizing a high-amino polymer; S2, under nitrogen protection, adding a catalyst and caprolactam or lauryl lactam to perform in-situ ring-opening polymerization on the surface of the high-amino polymer powder to generate a nylon 6 or nylon 12 coating layer; S3, melting and blending the coated high-amino polymer powder with PA66 chips in a certain proportion using a twin-screw extruder to obtain a high-amino functional masterbatch; and S4, preparing the high-amino nylon 66 fiber. The core of this invention lies in designing and synthesizing a high-amino polymer with a structure highly similar to PA66 but with an extremely high terminal amino content. Through an innovative "microencapsulation-masterbatch" technology, the dispersibility and thermal stability issues in the PA66 matrix are solved. Finally, through precise metering and blending spinning, a highly reactive nylon 66 fiber with controllable amino content is prepared.

The underwater liquid oxygen explosion pipeline assembly comprises a cracking device, an exhaust pipe, a liquid injection pipe, an electric ignition device and a biomass fuel core body, the liquid injection pipe and an ignition wire are assembled in the exhaust pipe in a centralized mode, the liquid injection pipe and the exhaust pipe are round pipes made of macromolecular polyethylene or nylon 12 materials, and the electric ignition device is connected with the cracking device. The exhaust pipe is seamlessly connected with a pipe cap of the fracturing device, waterproof sealing performance is achieved, the fracturing device is matched with a related threading device, the exhaust pipe is seamlessly connected with the pipe cap of the fracturing device in a hot melting welding mode, waterproof sealing performance is achieved, the fracturing device is tried under the underwater liquid oxygen gas explosion scene condition, gas explosion operation efficiency is high, operability is extremely high, the assembled fracturing device is safe and reliable, and a pipeline body is safe and concentrated. The gas explosion effect is good.

The application belongs to the technical field of composite materials, and particularly relates to a material for preventing blockage of a washing device and a preparation method thereof. The composite material comprises the following components in parts by weight: nylon 12T 80-100 parts, inorganic fiber filler 20-30 parts, toughening agent 5-10 parts, diatomite micro powder 10-15 parts, sarin resin 3-6 parts, graphene 1-3 parts, antioxidant 0.5-2 parts, lubricant 0.5-2 parts, coupling agent 0.5-2 parts. Diatomite provides a rigid skeleton in the micron scale, and graphene constructs a reinforcing network in the nanometer scale, forming a multi-level reinforcing structure. The high specific surface area of graphene can bridge the diatomite micro powder, improving the interface stress transmission. The sarin resin, as a flexible phase, can absorb energy when deformed under stress. The above fillers are combined with each other, effectively realizing the balance between the rigidity and toughness of the nylon 12T composite material.

The invention discloses bio-based nylon 12 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 bio-based 12-amino dodecanoic acid, water and a reaction aid in a material preparation tank to form a suspension; (2) feeding: adding the turbid liquid into a polymerization kettle through nitrogen pressurization; and (3) polymerizing: sequentially executing the following operations through a control system: heating and boosting, constant-temperature and pressure maintaining, heating and pressure reducing, constant-temperature and normal-pressure, constant-temperature vacuum, nitrogen boosting, water-cooling, bracing and pelletizing to obtain the bio-based nylon 12. According to the invention, through comprehensive optimization of the process flow and precise control of key nodes and matching of a specific reaction auxiliary agent, the process for obtaining nylon 12 by polymerization with bio-based 12-amino dodecanoic acid as a monomer is finally realized through a one-step method, continuous production can be realized, precise control of polymer molecular weight distribution is also realized, the molecular weight distribution is narrow, and the production cost is low. The product viscosity is uniform.