152 results about "Nylon 6" patented technology

The invention provides a nylon 6 nanofiber virus-removing filtering membrane and a preparation method and application thereof.The nylon 6 nanofiber virus-removing filtering membrane comprises a base material and a nylon 6 nanofiber membrane compounded to the surface of the base material, the average pore size of the virus-removing filtering membrane is 20 nm, the virus-removing filtering membrane plays a role in blocking parvoviruses, the surface of the virus-removing filtering membrane is charged, and the surface of the virus-removing filtering membrane is not prone to being damaged. Proteins with the same charges on the surface can be prevented from adhering to the surface of the fiber. In the preparation process of the virus-removing filtering membrane, the nylon 6 nanofibers with a certain diameter range are selected and compounded on the surface of the base material in a stable dispersion state, the uniform microporous virus-removing filtering membrane is prepared, the effect that parvoviruses are blocked and protein molecules are not easily intercepted is achieved, the hydrophilicity of the nylon 6 nanofibers is relatively good, and the virus-removing filtering membrane has a good application prospect. The non-specific adsorption of the filtering membrane on the protein is reduced; the nylon 6 nanofiber virus-removing filtering membrane can be applied to the field of biological medicine products, and has important significance on separation and purification of biological preparations.

The present invention provides a method for recovering ε-caprolactam and polyether polyurethane from a material comprising nylon 6 and polyether polyurethane in a plant, wherein the plant comprises a separation section [B], a depolymerization section [C], a recovery section [D], and a purification section [E].

The application relates to the technical field of textile materials, and provides hyaluronic acid microcapsules, hyaluronic acid-polyamide 6 master batches, hyaluronic acid-polyamide 6 filaments and preparation methods. The hyaluronic acid microcapsules are prepared by taking gum arabic and gelatin as wall materials, the hyaluronic acid-polyamide 6 master batches are prepared by using the hyaluronic acid microcapsules, and then the hyaluronic acid-polyamide 6 filaments are prepared by using the hyaluronic acid-polyamide 6 master batches. The hyaluronic acid microcapsules provided by the application can be uniformly dispersed in polyamide 6 fibers, and the spinnability and mechanical properties of the fibers are not affected, and the mechanical properties of the obtained filaments are excellent. The results of examples show that the breaking strength of the hyaluronic acid-polyamide 6 DTY filaments prepared by the application is 3.89-4.02 cN / dtex, and the breaking elongation is 26.31-28.02%.

The present application relates to the technical field of new energy power battery thermal management materials, in particular to a co-extrusion film material for aerogel thermal insulation pad packaging, and discloses a co-extrusion film, a preparation process and application in new energy batteries, wherein the co-extrusion film is prepared from high-performance master batches through a co-extrusion blow molding process, the high-performance master batches are composed of seven-vinyl POSS single-grafted nylon 6 resin, modified expanded vermiculite with octadecenyl and DOPO groups on the surface, and dicumyl peroxide initiator, under the action of the dicumyl peroxide initiator, the vinyl on the POSS cage structure of the seven-vinyl POSS single-grafted nylon 6 resin and the octadecenyl on the surface of the modified expanded vermiculite occur free radical reaction to obtain the high-performance master batches. Through the synergistic modification strategy of double grafting and crosslinking, the present application realizes the synergistic improvement of flame retardation, heat resistance, barrier property and mechanical property, and solves the technical bottlenecks of aerogel packaging materials in high-temperature failure, weak interface bonding and processing performance deterioration.

The application discloses a kind of superdispersion flame-retardant engineering plastic master batch and preparation method thereof, it is related to functional plastic technical field, including functional master batch, the functional master batch includes the following components by weight parts: nylon 6 sheet 100 parts, modified carbon nanotube 0.5-8 parts, diethyl phosphinic acid ethyl aluminum 5-15 parts, flame retardant 5-15 parts, carbon forming agent 2-5 parts, epoxy silicon dioxide 0.5-5 parts, compatible agent 0.5-5 parts.The application introduces diethyl phosphinic acid ethyl aluminum and flame retardant, forms carbon layer on the material surface when plastic master batch burns, and the interaction between the molecular chains of plastic master batch is improved by Schiff base structure, realizes the double performance improvement of plastic master batch flame retardant and anti-dripping, solves the problem of fire spread caused by melt dripping.

The invention belongs to the field of air filtering materials, and provides a non-gel activated carbon air filtering non-woven fabric. The design that the activated carbon particles are coated with polydopamine in situ and covalently connected with the nylon 6 fibers through Schiff base bonds and Michael addition bonds is adopted, and firm loading of the activated carbon particles in the non-woven fabric can be achieved without adding an independent binder; the problem that the adsorption efficiency is reduced due to the fact that a traditional binder blocks activated carbon micropores is solved. The thickness of the polydopamine coating layer is controllable, the loading capacity of the activated carbon can reach 5-40 wt%, low filtering resistance and high adsorption efficiency are still kept under the high-loading condition, the spunlace reinforcing technology ensures the particle distribution uniformity and batch stability, the tensile strength is not lower than 5 N / 5 cm, and the air purification application value is wide.

The invention discloses a method for preparing a PA6 / 56 bio-based copolyamide fiber through melt direct spinning, which comprises the following steps: mixing raw materials containing a caprolactam solution, a PA56 salt solution and a molecular weight regulator, preheating, carrying out prepolymerization reaction and polycondensation reaction to obtain a PA6 / 56 copolymer melt, and carrying out devolatilization to obtain a PA6 / 56 devolatilization melt; and carrying out melt spinning on the PA6 / 56 devolatilization melt to obtain the PA6 / 56 bio-based copolyamide fiber. According to the invention, bio-based 1, 5-pentamethylene diamine is adopted as a raw material of PA56, preheating and pre-polycondensation are firstly carried out after configuration, then polycondensation is carried out to further increase the number-average molecular weight of a nylon 6 prepolymer, and the obtained copolymer melt is in a molten state. Low polymers of the copolymer are removed through the devolatilization reactor, liquid phase extraction of PA6 / 56 is achieved, the extractable matter content of the obtained copolymer melt is smaller than or equal to 2 wt%, the technological process is simplified, and the production cycle, the equipment investment cost and the production energy consumption are greatly reduced.

The application is a kind of low water absorption and high heat distortion temperature copolymer nylon resin, which comprises the following components in weight percentage: 98% to 99.8% of nylon salt; 0.1% to 1% of end-capping agent; and 0.1% to 1% of hindered phenol monomer. The nylon salt comprises 60% to 80% of nylon 66 salt and 20% to 40% of nylon 6T salt. The end-capping agent is glycidyl ether containing silane and / or siloxane structure. The hindered phenol monomer comprises one or more of N,N'-bis-(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl)hexanediamine, 4,4'-butylidenebis(6-tert-butyl-3-methylphenol), and tris(2-methyl-4-hydroxy-5-tert-butylphenyl)butane. The product of the application can meet the production requirements of differentiated copolymer nylon and has universal applicability. Without adding filling materials such as fiber, kaolin, talc, etc., the water absorption can be significantly reduced, the melting point and heat distortion temperature can be increased, and the inherent properties of nylon 66 resin are not affected.

The application discloses a kind of photoresponsive self-repair antibacterial nylon materials and preparation method thereof.The material is modified nylon 6 polymer, aromatic Schiff base dynamic imine bond generated by condensation reaction of carboxyl benzaldehyde and p-phenylenediamine is embedded in its molecular main chain, which gives the material the ability of light-triggered self-repair without external heat source, and unexpectedly improves the mechanical properties and thermal stability of the material, the molecular chain end is bonded with antibacterial organic acid through amide bond, and the antibacterial organic acid is 2-methyl-4-(trifluoromethyl) thiazole-5-carboxylic acid.The preparation method adopts one-pot two-stage polymerization, after pressure opening ring prepolymerization, pressure relief vacuum is carried out to carry out deep condensation and end-capping, and the product is obtained by extrusion granulation and drying.The material can realize room temperature self-repair under natural light, and the antibacterial component is non-dissolution fixed.The application process is simple, the performance is adjustable, and can be used in the field of intelligent packaging, repairable antibacterial coating and biomedical materials.

The invention provides spinning-grade flame-retardant antistatic anti-aging copolymerized nylon 6 and a preparation method thereof, and belongs to the technical field of copolymerized nylon and preparation thereof. The spinning-grade flame-retardant antistatic anti-aging copolymer nylon 6 is prepared from the following components in parts by weight: 1000 parts of caprolactam, 40 to 80 parts of flame retardant salt, 2 to 30 parts of m-rGO, 1 to 10 parts of chain extender, 1 to 5 parts of phosphorus-containing catalyst and 1 to 5 parts of anti-aging agent, the flame-retardant antistatic nylon 6 is prepared by a pretreatment and copolymerization method, so that the flame retardance, antistatic property and aging resistance of the nylon 6 are improved, and meanwhile, the problems that a flame retardant is migrated and separated out, and processing or spinning is difficult after the flame retardant and an antistatic agent are added are solved.

The application discloses a composite nylon material preparation method, which is prepared by blending modified polytrifluoropropyl methyl siloxane containing hydrophobic trifluoropropyl side chains with nylon 6, realizing nanoscale dispersion in a melt extrusion process, adding an epoxy functionalized silane coupling agent and an organic tin catalyst, forming a three-dimensional crosslinked network under the hydrophobic effect of the trifluoropropyl side chains and the water blocking effect of the three-dimensional crosslinked network in the extrusion process, effectively blocking the diffusion channel of water molecules, improving the moisture resistance of the material, maintaining the tensile property of the raw material at 92-95%, and enhancing the wear resistance and thermal stability of the material by modified nanosilica; the equilibrium water absorption rate is only 0.7-0.9%, the low-temperature resistance is improved by more than 25%, and the low-temperature resistance is far superior to the embrittlement temperature of traditional PA6, so that the nylon material modification method has the advantages of maintaining mechanical properties, water resistance and low-temperature brittleness.

This invention relates to the field of polymer materials technology, and discloses a low-temperature resistant and high-impact protective face shield material and its preparation method. The protective face shield material of this invention comprises the following raw materials in parts by weight: 55-70 parts of nylon 66, 5-15 parts of nylon 6, 5-12 parts of a low-temperature toughening agent, 4-10 parts of a high-temperature resistant additive, 0.5-1 part of oleamide, 0.2-0.5 parts of silane coupling agent 550, 0.2-0.5 parts of an antioxidant, and 0.5-1.5 parts of an ultraviolet absorber. The low-temperature toughening agent of this invention can improve the impact resistance of nylon materials in low-temperature environments, maintaining excellent impact strength even at low temperatures. The high-temperature resistant additive gives the nylon material excellent high-temperature thermal stability, avoiding problems such as softening deformation, yellowing cracking, and mechanical property degradation at high temperatures.

The present invention relates to a process for recovering epsilon-caprolactam from a nylon 6-containing multi-component material. The present invention provides an improved process for the recovery of epsilon-caprolactam from nylon 6-containing multi-component materials, in particular multilayer films. Furthermore, the invention provides: a plant configured to carry out the method of the invention; and the recovered [epsilon]-caprolactam obtainable by the process of the invention having a product carbon footprint of less than 2.5 kg CO2 equivalents per kg of purified [epsilon]-caprolactam.

This application relates to the field of nylon 6 polymerization process technology, and provides a separation system for oligomers in nylon extract, including: a feed main pipe, crystallization devices, a temperature control system, a solid-liquid separation device, a fluidized bed, and an oligomer storage tank. At least two crystallization devices are provided, each connected in parallel and connected to the feed main pipe. The discharge end of each crystallization device is connected to the solid-liquid separation device. The temperature control system is connected to each crystallization device and regulates its temperature. The solid discharge port of the solid-liquid separation device is connected to the fluidized bed, and the fluidized bed is connected to the oligomer storage tank. Through the parallel arrangement of the crystallization devices, each crystallization device operates independently, providing time for cooling and crystallization to achieve continuous production.

The present application discloses an antimicrobial nylon material, along with its preparation method and application. The present application relates to the technical field of antimicrobial polymer materials and addresses the limitations of existing antimicrobial nylon 6, particularly its insufficient antimicrobial efficacy and challenges in scalability for industrial production. In the present application, a seven-membered cyclic lysine-derived monomer is copolymerized with a lactam via hydrolytic copolymerization using water as an initiator, yielding a copolyamide. The resulting copolyamide is then subjected to a protonation reaction through heating and stirring in an acidic solution, followed by purification to obtain the final antimicrobial nylon material. The seven-membered cyclic lysine-derived monomer may be an unprotected cyclic lysine monomer, a mono-protected cyclic lysine monomer, or a salt form cyclic lysine monomer. The present invention exhibits broad applicability in antimicrobial-sensitive fields such as textiles, plates, pipes, packages or panels.

This invention discloses a nitrogen-phosphorus flame retardant, a composition and composite material containing the flame retardant, its preparation method, and its application. The flame retardant has a structure as shown in formula (I), where n is an integer from 100 to 150. The preparation method of the flame retardant includes: synthesizing bis(4-formylphenyl) phenylphosphonate and bis(4-aminophenyl)phenylphosphonate, reacting the two to generate a Schiff base, and then reacting it with 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide to obtain the nitrogen-phosphorus flame retardant PCNPO. This flame retardant, when compounded with melamine cyanurate (MCA), can be used to prepare flame-retardant nylon 6 composite materials. This invention, through the synergistic effect of PCNPO and MCA, enables nylon 6 to achieve the UL94 V-0 flame retardant standard at a low addition level, while maintaining excellent mechanical properties and processing stability, and exhibiting strong charring ability, simple process, and environmental friendliness. (I)

The invention relates to the technical field of chemical fiber production equipment, and discloses a production device of flame-retardant anti-molten-drop chinlon 6 filaments, which comprises a production platform and a console arranged on the production platform, and further comprises a feeding assembly, the feeding assembly comprises a chinlon 6 slice feeding cylinder, a first-stage mixing assembly is arranged below the chinlon 6 slice feeding cylinder, and a second-stage mixing assembly is arranged below the first-stage mixing assembly. The tail end of the first-stage mixing assembly is connected with the second-stage mixing assembly, and the melting assembly is nested on the outer side of the first-stage mixing assembly. According to the device, a two-stage mixing structure of double-screw staggered shearing and planetary gear meshing shearing is adopted, accurate quantity control feeding is achieved through the metering screw, a global uniform shearing field is constructed, a mixing path is prolonged, the technical problems of flame retardant agglomeration and uneven mixing in traditional single-stage mixing are solved, and the flame retardant mixing efficiency is improved. According to the invention, the dispersion precision of the flame retardant in the melt is ensured to reach the required dispersion precision of filament molding, the spinneret orifice blockage and the linear density deviation are avoided through filter plate filtration and multi-stage parameter regulation and control, and the flame-retardant consistency and the molding qualification rate of the chinlon 6 filament are obviously improved.

The invention relates to the field of enzyme engineering, in particular to a mutant of nylon degrading enzyme and application of the mutant. The mutant of the nylon degrading enzyme is obtained by mutation at one or more key sites through stability modification guided by machine learning, substrate channel inlet loop region modification and tetramer interface modification on the basis of a wild type nylon degrading enzyme NylCp2-TS as shown in SEQ ID NO: 1; the mutant enzyme can efficiently degrade nylon materials in various forms, including films, particles and industrial fibers of nylon 6 and nylon 66, and has a wide application prospect in the field of nylon waste biodegradation.

The application discloses a nylon 6 modified chip production device and a production method thereof. The device comprises a fixed bottom plate, a melt device, a strip injection and granulation device, an extraction device, a drying device, a packaging device and a conveying device which are sequentially fixedly installed on the fixed bottom plate. A feeding device for feeding glass fibers is arranged on the melt device. A driving mechanism for automatically filling the packaging bag with chips and moving out is arranged on the packaging device. The device and the method can reduce the packaging, transportation and melting costs of the chips, and can automatically fill a large number of packaging bags with chips and push the chips to a placing plate.

This invention discloses a method for preparing intrinsically flame-retardant nylon 6, belonging to the field of polymer material synthesis technology. The method includes the following steps: 1) reacting caprolactam, an initiator, and a heat stabilizer under nitrogen protection at 160-180℃ and 0.1-0.3 MPa for 2-3 hours to prepare a nylon prepolymer (oligopolymer) with a number-average molecular weight of 500-2000; 2) adding terminal amino-terminated organosilicon to the nylon prepolymer, and copolymerizing at 200-230℃ and 0.3-0.6 MPa for 3-5 hours, followed by atmospheric pressure reaction, vacuum devolatilization, cooling, and granulation to obtain intrinsically flame-retardant nylon 6 particles; 3) optionally, subjecting the particles to boiling and drying post-treatment to obtain the final product. This invention employs a two-step process of first preparing the prepolymer and then copolymerizing and modifying it, enabling the terminal amino-terminated organosilicon to be covalently embedded in the nylon 6 molecular chain, achieving intrinsic flame retardancy and solving problems such as easy migration of flame retardants, short-lasting flame retardant performance, and decreased mechanical properties in existing technologies. The resulting intrinsically flame-retardant nylon 6 has high flame retardant efficiency, excellent mechanical properties, and simple and controllable process, making it suitable for large-scale industrial production and widely used in electronics, automobiles, textiles and other fields.

This invention relates to the field of spinning technology, and more particularly to a method for preparing recycled hollow nylon 6. The method includes (1) drying; (2) raw material extrusion; (3) spinning; and (4) drawing and winding. This invention adds a nitrogen-filled hole in the middle of the spinneret, which firstly accelerates melt cooling, reduces the fiber melt expansion effect, and simultaneously ensures that the fiber melt expansion mainly occurs outwards, increasing the hollowness; secondly, it protects the freshly produced recycled yarn from oxidation at high temperatures, ensuring spinning stability. Furthermore, by optimizing the spinning process, recycled hollow nylon 6 fibers with good spinning stability and high hollowness are obtained.

The invention provides a method for slicing anionic polymerization fiber-grade nylon 6, and belongs to the technical field of chemical preparation. The method comprises the following steps: respectively pouring materials into corresponding reactors, heating, carrying out vacuum dehydration, feeding into a mixing reactor, heating, melting, stirring and devolatilizing after the reaction is completed, and drafting the melt to prepare slices. The technological process is simple, the product quality is stable, the relative viscosity of the obtained nylon 6 slices is 2.8-3.1, the molecular weight distribution is 1.8-2.0, the conversion rate is 98%, and the nylon 6 slices can be directly used for melt spinning without aftertreatment, so that the anionic polymerization nylon 6 breaks through the traditional casting molding field and can be applied to various melt processing environments.

The application belongs to the technical field of high polymer materials, and particularly relates to a high-toughness nylon 6 material and a preparation method thereof. The high-toughness nylon 6 material is prepared by soaking nylon 6 raw materials in an aqueous solution of an ionic liquid. The ionic liquid can be [BMIM]BF4. The concentration of the aqueous solution of the ionic liquid is 2-10 wt.%. The application provides more choices for the modification of the high-toughness nylon 6, expands the application range of the high-toughness nylon 6, and has a good application prospect.

The invention generally relates to a high polymer material modification technology, in particular to a nylon 6 composite material and a preparation method thereof, and the nylon 6 composite material comprises the following raw materials by mass: 60-75 parts of nylon 6; 8 to 15 parts of lamellar potassium titanate whisker; 5-12 parts of glass fiber and / or carbon fiber; 1-3 parts of molybdenum disulfide; 2 to 4 parts of nano montmorillonite; 4-5 parts of a coupling agent; 3 to 5 parts of a crosslinking compatilizer; 1-2 parts of a tackifier; and 0.5 to 1.5 parts of an antioxidant. The high-friction and high-viscosity nylon 6 composite material is successfully prepared through collaborative design of the lamellar potassium titanate whiskers and the fiber filler in combination with precise regulation and control of the tackifier.

The invention provides a flame-retardant antistatic nylon fiber with a skin-core structure and a preparation method of the flame-retardant antistatic nylon fiber, and belongs to the technical field of nylon fibers. The flame-retardant antistatic nylon fiber comprises an antistatic nylon skin layer and a flame-retardant nylon core layer, the outer surface of the flame-retardant nylon core layer is coated with the antistatic nylon skin layer, the antistatic nylon skin layer comprises a nylon 6 matrix and an antistatic agent, and the antistatic agent is aniline modified zirconium phosphate; wherein the aniline modified zirconium phosphate is obtained by carrying out in-situ polymerization on aniline monomers between stripped zirconium phosphate layers. The flame-retardant antistatic nylon fiber is obtained through sheath-core composite melt spinning. According to the invention, the antistatic agent and the flame retardant are efficiently and stably introduced into the nylon matrix, and the synergistic effect of the antistatic agent and the flame retardant is realized, so that the fiber has better spinnability and mechanical property, and meanwhile, the long-term effect and durability of the function are ensured.

The invention relates to a homogeneous cation selective exchange membrane and a preparation method thereof, and belongs to the technical field of ion exchange membranes. The raw material of the homogeneous cation exchange membrane comprises film-forming resin, and the film-forming resin is hyperbranched nylon 6 resin; the hyperbranched nylon 6 resin is prepared by taking a sulfo-terminated cyclotriphosphazene monomer as a branching agent and carrying out hydrolysis ring-opening polymerization reaction on the sulfo-terminated cyclotriphosphazene monomer and caprolactam. The hyperbranched structure of the hyperbranched nylon 6 resin is utilized, a sulfonic group at the tail end can be used as an active group for cation exchange, and the homogeneous cation exchange membrane has good processability, so that the homogeneous cation exchange membrane has excellent selective adsorption and migration exchange capacities and shows excellent rapid kinetics in the ion exchange process.

The invention relates to an ultra-soft and anti-pilling snagging yoga pants fabric and a preparation process thereof. The preparation process comprises the following steps: S1, weaving a gray cloth fabric, wherein the gray cloth fabric is formed by weaving main yarn 40D / 48F matte chinlon 6 low stretch yarn and laying yarn 40D spandex; the weave design is as follows: the main yarns are woven into double rib weaves, and the laying yarns are woven by adopting a feeding stitch method to obtain a gray cloth fabric; s2, sanding the gray cloth fabric; s3, pre-preparation of gray cloth fabric; s4, dyeing; s5, loosening and drying the cloth; s6, sanding is conducted; and S7, after-finishing and shaping. The finished fabric prepared by the preparation process is good in stretching recovery performance, softer, finer and fluffy, and good in wear resistance and air permeability.

This invention relates to the field of textile fabric technology, specifically a lightweight, high-count, high-density fabric and its preparation method. The invention involves a copolymerization reaction of potassium propyl 3-methyl methacrylate, a double-bond-terminated flame retardant, modified triphosphazene, glycidyl methacrylate, and azobisisobutyronitrile to obtain an antistatic flame retardant. The antistatic flame retardant and amino-terminated hyperbranched polyamide are pre-melted and blended, and then nylon 6 is added. The mixture is then melt-spun, drawn, and cooled to obtain modified nylon fibers. These modified nylon fibers are used as the core yarn, and an outer blended yarn is added. The resulting fabric is produced through a compact Sirosfil spinning process, twisting, and plain weave. The finished fabric obtained by this invention possesses excellent flame retardancy, antistatic properties, and toughness, thus having broad application prospects in the field of textile fabric technology.

The invention discloses a method for catalyzing waste nylon 6 to be depolymerized into caprolactam, and belongs to the technical field of polyamide waste material depolymerization. The problems that an existing nylon 6 depolymerization method lacks a cheap, easily available and efficient catalytic system, and the purity of caprolactam monomers obtained by catalyzing nylon 6 depolymerization is low are solved. Sodium caprolactam or potassium caprolactam which is cheap, easy to obtain and low in cost and can be prepared from caprolactam, sodium hydroxide / potassium hydroxide, sodium alkoxide / potassium alkoxide and the like through simple process steps is adopted as a depolymerization catalyst, participation of additional solvents such as water is not needed, and the caprolactam is efficiently depolymerized through nylon 6 under the reduced pressure heating condition; the catalyst is prevented from remaining in the product, the purity of the recovered monomer is high, the monomer product can be directly recycled, and the recycling efficiency of the nylon 6 is improved.

The utility model provides a yarn connecting device for chinlon 6 spinning production, which is arranged in a spinning box and comprises a yarn connecting plate matched with the spinning box, a bearing table top is arranged at the bottom of the spinning box, and the yarn connecting plate is lapped on the bearing table top. When a product with thick single fiber is produced, the yarn receiving plate is installed in the spinning box, the yarn receiving plate is used for receiving tows sprayed out of the spinneret plate, the tows are prevented from penetrating through a channel opening and falling onto a winding machine table, and the yarn winding phenomenon is effectively prevented.