494 results about "Nylon 6" patented technology

The invention discloses an antibacterial nylon material as well as a preparation method and application thereof, relates to the technical field of antibacterial high polymer materials, and solves the problems of poor antibacterial performance and difficulty in industrial production of existing antibacterial nylon 6. The preparation method comprises the following steps: mixing a seven-membered cyclic lysine derivative monomer with lactam, and carrying out hydrolytic polymerization by taking water as an initiator to obtain copolyamide; and placing the copolyamide in an acid solution, heating and stirring to carry out protonation reaction, and purifying the reaction product to obtain the antibacterial nylon material. The seven-membered cyclic lysine derivative monomer is an unprotected cyclic lysine monomer (aminocaprolactam), a single protected cyclic lysine monomer or a salified cyclic lysine monomer. The method can be widely applied to the fields with antibacterial requirements, such as fabrics, plates, pipes, packaging and various panels.

The invention discloses functional caprolactam, an intrinsic flame-retardant nylon material as well as a preparation method and application thereof, and relates to the technical field of flame-retardant nylon materials. The preparation method comprises the following steps: preparing an alpha-amino-epsilon-caprolactam intermediate by taking lysine as an initial raw material through one-step efficient cyclization, then reacting with a reagent containing a flame-retardant group to obtain functional caprolactam, and finally introducing the flame-retardant group into a side chain of nylon 6 by utilizing ring-opening copolymerization of the functional caprolactam and caprolactam to prepare the intrinsic flame-retardant nylon material. The flame-retardant nylon material can effectively avoid the migration and loss of the flame retardant, improve the dispersity of the flame retardant and enhance the flame-retardant effect, can keep the main chain structure of the nylon 6 unchanged, reduces the influence on the inherent performance of the nylon 6, is expected to directly replace the existing nylon 6 material, and is applied to the fields of automobiles, textiles, electronics and electrics, buildings, packaging and the like. In addition, a renewable lysine resource is used for partially replacing a petroleum resource, so that the method has the advantages of resource conservation, environmental friendliness, simple process, low cost and the like.

The invention provides a metal organic sulfonic acid-based solid acid catalyst applied to nylon 6 recovery and depolymerization and a preparation method thereof, and realizes upgrading and recovery of waste nylon 6. The main contents are as follows: (1) a structural design and a preparation method of the metal organic framework sulfonic acid-based solid acid catalyst; and (2) the solid acid is used for catalytic depolymerization of nylon 6. The problems that equipment corrosion is aggravated by inorganic acid in the nylon 6 recovery process and a liquid-phase catalyst is difficult to separate and recover are solved, and the application prospect is good.

The invention discloses a macromolecular antibacterial agent, an antibacterial nylon material as well as a preparation method and application thereof, and relates to the technical field of antibacterial macromolecular materials. According to the invention, lysine is used as a raw material, the polymer antibacterial agent is prepared through reactions such as dehydration ring formation and re-ring opening polymerization, the polymer antibacterial agent has the characteristics of high safety, biodegradability and good biocompatibility, and has the same polyamide main chain structure as nylon, the polymer antibacterial agent and nylon have good compatibility, and the polymer antibacterial agent and nylon 6 are fused and blended to form a nylon 6 sample. Through amide exchange reaction and hydrogen bond interaction between the macromolecular antibacterial agent and nylon 6 molecular chains, the antibacterial nylon material with excellent mechanical property and lasting and stable antibacterial effect is prepared, and the requirements of people for safety and environmental friendliness are met. The prepared antibacterial nylon material can be applied to antibacterial products such as textiles, daily necessities and packaging materials. Meanwhile, the macromolecular antibacterial agent and the antibacterial nylon material are simple in preparation process, low in raw material cost and suitable for industrial production.

The invention discloses a process for preparing a polyester fiber fabric by regenerating polyester waste bottle flakes, belongs to the technical field of polyester fiber fabric processing, and aims to solve the technical problem that the moisture absorption and quick drying performance, friction resistance and pilling resistance of the polyester fiber fabric in the prior art need to be further improved. The method comprises the following steps: adding polyester waste bottle flakes into a pulverizer, pulverizing, sieving with a 60-mesh sieve to obtain polyester regenerated powder, and pretreating the polyester regenerated powder to obtain pretreated polyester powder; composite polyester is prepared from modified polysiloxane enhanced copolyester containing nylon 6 and polyvinyl alcohol blocks, and then the porous composite polyester fiber is prepared by taking polyvinyl alcohol as a pore forming agent, so that the moisture absorption and quick drying performance of the polyester fiber fabric is effectively improved, the wearing experience of the polyester fiber fabric is enhanced, and the service life of the polyester fiber fabric is prolonged. The wear-resistant and anti-pilling performance of the polyester fiber fabric is also improved.

The invention provides a hydrolysis method of a waste nylon 6 fishing net. The hydrolysis method comprises the following steps: step 1, screening the waste nylon 6 fishing net, cleaning, removing impurities, disinfecting and crushing; step 2, pretreating diatomite; step 3, adding pretreated diatomite, solid acid and deionized water into a reaction kettle, stirring at 50 DEG C for 5 hours, and removing moisture to obtain a solid acid catalyst; 4, adding the solid acid catalyst, the cleaned waste nylon 6 fishing net and deionized water into a reaction kettle, controlling the temperature and time for reaction, and filtering while hot to obtain a liquid-phase product; 5, neutralizing, decolorizing and extracting the liquid-phase product to obtain a caprolactam monomer; and 6, carrying out polymerization reaction on the obtained caprolactam monomer to generate regenerated polyamide for chinlon spinning. According to the method provided by the invention, the solid acid catalyst is easily separated from reactants, the catalytic efficiency is high, the corrosion to equipment can be reduced, and the method is more environment-friendly.

The invention relates to the technical field of fibers, and discloses a graphene modified polyamide fiber preparation method, which comprises: mixing 0.05-0.5 part by weight of graphene oxide, 1-4 parts by weight of carboxyl-terminated hyperbranched polyesteramide and nylon 6, and carrying out melt blending spinning, drafting and cooling setting in a spinning machine to obtain the graphene modified polyamide fiber. The hyperbranched polyesteramide has good compatibility with nylon 6, plays a good toughening role, improves the interfacial compatibility of graphene oxide and nylon 6, and improves the breaking strength and elongation at break of the fiber. The end group of the hyperbranched polyesteramide contains a large amount of hydrophilic carboxyl, and the main chain contains hydrophilic amido bonds, so that the moisture regain of the polyamide fiber can be improved, and the hydrophilic moisture absorption performance can be improved.

The invention relates to the technical field of fibers, and discloses a preparation method of antibacterial modified fibers for textile fabrics, nylon 6 and copper-tea polyphenol-based hyperbranched polyamide are added into formic acid, the mixture is stirred and then spun by an electrostatic spinning machine, and the antibacterial modified fibers for the textile fabrics are obtained. The hyperbranched polyamide has good compatibility with nylon 6, contains a three-dimensional dendritic hyperbranched molecular chain, has a good toughening effect on nylon 6 fibers, and enables the fibers to maintain good breaking strength while improving the elongation at break of the fibers. The copper-tea polyphenol-based hyperbranched polyamide contains tea polyphenol active antibacterial substances and antibacterial copper ions, so that the antibacterial performance of the fiber is remarkably improved. Meanwhile, the copper ions, the tea polyphenol and the catechol-based hyperbranched polyamide form a tight and firm coordination effect, and the copper ions and the tea polyphenol are also difficult to elute from a fiber matrix, so that the fiber still keeps excellent antibacterial performance.

The invention belongs to the technical field of high polymer materials, and particularly relates to an antimony-free flame-retardant nylon material with high glowing filament temperature as well as a preparation method and application of the antimony-free flame-retardant nylon material. The invention relates to an antimony-free flame-retardant nylon material with high glowing filament temperature. The antimony-free flame-retardant nylon material is prepared from the following raw materials in percentage by weight: 70-74% of nylon 6 (PA6) resin, 16.5-18.5% of brominated flame retardant, 6-12% of phosphorus flame retardant, 0.5-1.5% of auxiliaries and 0.5-1% of black masterbatch. According to the invention, antimony trioxide is replaced by the phosphorus-based flame retardant, the phosphorus-based flame retardant and bromine are subjected to synergistic flame retardance, the flame retardance reaches UL94V0 (1.6 mm), a high glowing filament temperature GWIT850 DEG C can be obtained, and a glue opening of a black workpiece is not whitened.

The invention relates to the technical field of chinlon industrial yarns, and discloses a preparation method of a high-strength and high-toughness chinlon industrial yarn, which comprises the following steps: (1) preparing raw materials; (2) mixing the materials; (3) melt spinning; (4) stretching and heat treatment; (5) fiber surface modification; according to the invention, by fusing the advantages of high crystallization speed of nylon 6 and high melting point and high strength of nylon 66, a matrix material with good processing fluidity is formed, and the strength and fatigue cycle resistance of the chinlon industrial fiber are obviously improved. By introducing the maleic anhydride grafting agent, polar groups can be introduced among molecular chains through grafting reaction, so that the hydrogen bond density and crystallinity are remarkably improved, the molecular chains are arranged more regularly, and the tensile strength and heat resistance of the material are improved. The sea-island structure of the polyether ester elastomer effectively absorbs impact energy, so that the elongation at break is greater than or equal to 28%; the nano silicon dioxide inhibits crack propagation, and the service life of the material is remarkably prolonged.

The invention discloses flame-retardant anti-fouling copolymer nylon 6 and a preparation method and application thereof, and the preparation method comprises the following steps: adding a phosphorus-containing flame-retardant monomer, a silicon-containing reaction monomer, lactam, an initiator and a catalyst into a polymerization reaction kettle, and introducing nitrogen to replace air in the kettle; under the protection of nitrogen, firstly raising the temperature to 180-220 DEG C to carry out prepolymerization reaction, and then raising the temperature to 240-260 DEG C to carry out polymerization reaction; and after the polymerization reaction, removing water vapor in the system to react in a normal pressure state, then vacuumizing to react, filling nitrogen to recover to normal pressure after the reaction is finished, and discharging and cooling to obtain the flame-retardant and anti-fouling copolymer nylon 6. The phosphorus-containing comonomer and the silicon-containing comonomer are introduced into the copolymerized nylon, the intrinsic flame-retardant nylon material with high flame-retardant efficiency and permanent flame retardance is prepared through melt copolymerization at a relatively low introduction amount, and the intrinsic flame-retardant nylon material has certain hydrophobic and anti-fouling properties and also retains good mechanical properties and spinnability of the nylon material.

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 invention relates to the technical field of engineering plastic detection, and particularly discloses an aging detection and evaluation method and system suitable for nylon 6 in a marine environment, the system comprises nylon 6 as a core layer, an aging response color-changing material as a surface layer and a middle layer located between the core layer and the surface layer; the thickness of the middle layer is 200-250 [mu] m, and the composite conductive film is transferred to the position 0.2 mm below the surface of the nylon 6 component in a hot pressing mode; the thickness of the surface layer is 0-200 microns and is realized by spraying an aging response color-changing material solution. By integrating the specially designed aging response color-changing material and the conductive film into the nylon 6 matrix, real-time, visual and efficient detection of the aging process is realized. According to the method, the problem that equipment such as a traditional optical fiber spectrometer is complex and expensive is solved, the convenience of field detection is greatly improved through double signal output of color gradient indication and simple electronic reading, and a brand new technical solution is provided for life prediction and preventive maintenance of nylon 6 components in ocean engineering.

The invention discloses a nanofiber-containing polymer composite material and a preparation method thereof, and the nanofiber-containing polymer composite material is prepared from the following raw materials in parts by weight: 90-100 parts of polypropylene, 10-15 parts of nylon 6, 13-16 parts of a modified flame retardant, 4-7 parts of modified carbon nanotubes, 3-5 parts of a compatilizer, 0.5-0.8 part of an antioxidant and 0.3-0.5 part of a lubricant. According to the composite material, polypropylene and nylon 6 are blended, and a modified flame retardant prepared by a formulated method, a modified carbon nanotube, a synergistic compatilizer and other assistants are added, so that the defects that an existing polypropylene material is easy to degrade and inflammable, a traditional flame retardant and an antioxidant are easy to migrate and lose efficacy and the like are effectively overcome; according to the polypropylene composite material, the mechanical property of the material is maintained and improved while efficient flame retardance and excellent weather resistance and aging resistance (especially ultraviolet aging resistance) are achieved, the problem that in the prior art, performance in multiple aspects is difficult to consider is solved, and the application range of the polypropylene composite material is widened.

The invention relates to the technical field of fibers, and discloses a preparation method of a high-elasticity nylon fiber for a tennis racket string, nylon 6 and polyether modified polyimide with the mass ratio of 100: (10-30) are subjected to melt blending spinning in a spinning machine, then drafting and sizing are performed through a hot roller drafting machine, and the high-elasticity nylon fiber for the tennis racket string is obtained. The polyether modified polyimide contains the same amido bond structural unit as nylon 6, so that the polyether modified polyimide has good compatibility with nylon 6, the polyether modified polyimide can be uniformly dispersed in a nylon fiber matrix, and a flexible polyethylene glycol molecular chain is introduced into a polyimide molecular chain, so that the polyether modified polyimide improves the toughness and elasticity of the nylon fiber; therefore, the high elongation at break and the high elastic recovery rate are shown. The nylon fiber disclosed by the invention has good practical application in the aspects of tennis racket lines and the like.

The invention relates to a method for efficiently hydrolyzing nylon 6 by acid catalysis, and relates to the technical field of hydrolysis of nylon 6, the method comprises the following steps: carrying out hydrolysis reaction on nylon 6, water and an acid catalyst in a closed state to obtain a hydrolysis product; and carrying out purification post-treatment on the hydrolysis product to obtain caprolactam, the reaction pressure of the hydrolysis reaction is controlled in a self-boosting manner; the specific process of the self-boosting mode comprises the step of changing the pressure of the hydrolysis reaction system by adjusting the adding mode of the water. The nylon 6 hydrolysis process provided by the invention is simple, hydrolysis reaction pressure is controlled mainly by a self-boosting control method of a reaction system by controlling a water adding mode, other raw materials do not need to be added, efficient hydrolysis of nylon 6 is realized, and the nylon 6 hydrolysis process has the characteristics of short hydrolysis reaction time, high depolymerization rate and the like, and is suitable for industrial production. The method effectively solves the technical problems of long hydrolysis reaction time and low depolymerization rate in the existing process for catalyzing and hydrolyzing nylon 6 by using an acid method.

The invention relates to a nylon 6 polymerization production method capable of fully recycling extractable oligomers, and relates to the technical field of nylon 6 polymerization production processes, the nylon 6 polymerization production method comprises a nylon 6 polymerization section, a nylon 6 slice extraction section, a nylon 6 wet slice drying section, an extract evaporation and concentration section and an extractable oligomer cracking and recycling section; in an extractable oligomer cracking and recycling section, by adjusting process conditions such as temperature, pressure and water content of an oligomer extraction concentrated solution, deep cracking of extractable substances is realized, and all cracking products can be recycled into a polymerization section for recycling, so that rapid accumulation of cyclic dimers in polymers is inhibited, no residues are generated in the polymerization process, and the production cost is reduced. Accumulation of cyclic dimers in a system can be effectively slowed down, the service life of a polymerization reactor is prolonged, and the quality of polymer products is improved.

The invention relates to the technical field of nylon, and discloses flame-retardant fireproof high-temperature-resistant nylon and a preparation method thereof. According to the invention, nylon 6, a montmorillonite-copper complex flame retardant and the like are extruded and granulated in a twin-screw extruder to obtain the flame-retardant fireproof high-temperature-resistant nylon. After surface organic modification, montmorillonite has good compatibility with nylon 6, the tensile strength of the material is increased, the flame retardant contains phosphate groups and more nitrogen-containing ureido and phenanthroline structures to form a nitrogen-phosphorus flame retardant, and meanwhile, the flame retardant contains a salicylic acid-phenanthroline-copper complex structure to catalyze charring of a nylon matrix at high temperature, so that the flame retardant has excellent flame retardancy. The flame retardance of the nylon material is remarkably improved, the UL94 grade reaches the V0 grade, the limit oxygen index is increased, the residual carbon amount at high temperature is increased, and the high-temperature resistance of the material is improved.

The invention discloses a carbon nano tube / caprolactam in-situ body synthesized nylon 6 composite material and a preparation method and application thereof, the material is prepared from a carbon nano tube, caprolactam and a catalyst through a body reaction processing technology, and the carbon nano tube is a single-wall or multi-wall carbon nano tube. The preparation method specifically comprises the following steps: firstly, uniformly mixing the raw materials according to a specific proportion, and then sequentially completing the conveying of low-viscosity raw materials, the self-initiation of polymerization reaction, macromolecular growth and the extrusion of high-viscosity products in a double-screw extruder, so that the caprolactam monomer is subjected to continuous chemical reaction and physical forming, and the caprolactam-based composite material is obtained. The conductive carbon nanotube modified nylon 6 composite material is obtained through one-step in-situ bulk polymerization. According to the invention, under the condition that only a trace amount of carbon nanotubes are added, the composite material can present excellent conductivity, the preparation method is simple and efficient, has a remarkable cost advantage and is easy for industrial production, and the morphological structure of the composite material can be flexibly regulated and controlled through molding equipment according to actual use requirements.

The invention relates to a catalytic depolymerization method of a nylon 6 extraction oligomer, and relates to the technical field of polymer depolymerization, a nylon 6 extraction oligomer concentrated solution and a depolymerization catalyst are mixed, heated and subjected to ultrasonic treatment, and a premix is obtained; and performing staged gradient depolymerization on the premix in an inert gas atmosphere to obtain a depolymerization product. The staged gradient depolymerization of the nylon 6 extracted oligomer is realized by controlling the reaction pressure and the reaction temperature in the depolymerization reaction system to be subjected to staged gradient change along with the reaction time, the depolymerization process is simple to operate, other raw materials do not need to be added, the depolymerization rate of the nylon 6 extracted oligomer is increased, and the production cost is reduced. The technical problems of poor catalytic depolymerization effect, tedious operation steps and the like in the conventional catalytic depolymerization process of the nylon 6 extracted oligomer concentrated solution are effectively solved.

The invention relates to the technical field of vacuum bag films for aeronautical manufacturing, and discloses an eleven-layer co-extruded film for aeronautical use and a preparation process thereof, and the preparation process specifically comprises the following steps: carrying out grafting modification treatment on polyamide acid by using a monoalkenyl diepoxy composite flexible compound through a carboxyl-epoxy ring-opening reaction to prepare alkenyl functionalized processable polyimide; the preparation method comprises the following steps: carrying out modification treatment on nylon 6 resin by using 3-mercaptopropionic acid through an amino-carboxyl condensation reaction to prepare mercapto functionalized nylon; under the hot melting condition, alkenyl functionalized processable polyimide and sulfydryl functionalized nylon are induced to be subjected to reactive compounding through a free radical initiator, PA-PI alloy master batch is prepared, the master batch serves as a functional modification component of copolymerized polyamide 6 / 66 resin, an eleven-layer co-extrusion film is prepared through an eleven-layer co-extrusion blow molding process, and the eleven-layer co-extrusion film is used as a functional modification component of the copolymerized polyamide 6 / 66 resin. The film product has excellent comprehensive performance and can be used as a high-temperature-resistant vacuum bag film for curing aviation composite materials.

The invention discloses a reinforced nylon plastic particle and a manufacturing method thereof. The reinforced nylon plastic particle is characterized by comprising the following components in percentage by weight: 45-50% of nylon 6, 48-53% of silicon dioxide, 0.5-1% of a flowable agent, 0.1-0.5% of an antioxidant and 0.1-0.5% of a nucleating agent. The reinforced nylon plastic particle has the effects of high impact resistance, high modulus and high hardness.

The invention discloses a bio-based fiber reinforced composite material and a preparation method thereof, and belongs to the technical field of bio-based fiber composite materials. The bio-based fiber reinforced composite material is prepared from the following raw materials in parts by weight: 60 to 80 parts of nylon 6, 10 to 20 parts of bio-based aramid fiber, 5 to 10 parts of modified carbon fiber, 2 to 6 parts of hyperbranched polyester modified zinc oxide and 1 to 3 parts of antioxidant, the bio-based aramid fiber is prepared by reacting 2, 5-furandicarbonyl chloride with two diamine monomers, and the two diamine monomers respectively contain trifluoromethyl and sulfuryl; the modified carbon fiber is obtained by grafting polyamidoamine on the surface of carbon fiber; the hyperbranched polyester terminal group of the hyperbranched polyester modified zinc oxide contains an epoxy group. The modified carbon fiber, the bio-based aramid fiber and the hyperbranched polyester modified zinc oxide are added into the nylon matrix, so that the composite material is endowed with good ultraviolet resistance, comprehensive mechanical properties and durability.

The present disclosure relates to a method that includes hydrolyzing a polyamide by contacting the polyamide with a hydrolase. In some embodiments of the present disclosure, the polyamide may include nylon-6, nylon 6,6, or a combination thereof. In some embodiments of the present disclosure, the hydrolyzing may produce aminohexanoic acid, an oligomer of aminohexanoic acid, ε-caprolactam, or combinations thereof.

The invention relates to the technical field of polypropylene composite materials, and discloses a high-strength antibacterial polypropylene composite material and a preparation method thereof, the polypropylene composite material comprises 60-90 parts by weight of polypropylene, 10-40 parts by weight of nylon 6, 2-8 parts by weight of maleic anhydride grafted polypropylene, 0.5-2 parts by weight of an arginine antibacterial agent and the like. The arginine antibacterial agent has good compatibility with polypropylene and nylon 6, is uniformly dispersed in the composite material, has little influence on the mechanical properties of the material, and can maintain very high tensile strength and impact strength. A side chain of the arginine antibacterial agent contains a large number of guanidyl antibacterial groups, and the arginine antibacterial agent is good in heat resistance, not prone to thermal decomposition, uniformly dispersed in a composite material matrix and capable of effectively killing staphylococcus aureus and escherichia coli, so that the composite material has very high antibacterial performance.

The invention relates to the technical field of high polymer materials, and discloses a wear-resistant nylon bar and a preparation method thereof. The nylon bar comprises the following raw materials in percentage by mass: 45-65% of nylon 6, 12-25% of glass fiber, 5-8% of nano silicon dioxide, 8-15% of a wear-resistant modifier, 4-8% of a flexibilizer, 0.5-2% of a silane coupling agent, 0.5-1.5% of a lubricant, 0.1-0.3% of an antioxidant and 0.5-2% of a heat stabilizer. According to the nylon bar, nylon 6 is used as a main material, and functional aids such as a wear-resistant modifier, a flexibilizer and glass fibers are added, so that the wear resistance of a matrix is improved; wherein the wear-resistant modifier has a microcapsule-like structure and can be broken when the base material is rubbed to release the internal modified base oil, so that the wear resistance is realized.

The invention discloses a Schiff base epoxy oligomer chain extender as well as a preparation method and application thereof. The preparation method of the Schiff base epoxy oligomer chain extender comprises the following steps: adding p-hydroxybenzaldehyde and p-hydroxyaniline into ethanol, reacting at 30-70 DEG C for 2-5 hours, and performing suction filtration to obtain a 4-((4-hydroxybenzylidene) amino) phenol intermediate; and mixing the 4-((4-hydroxybenzylidene) amino) phenol intermediate, epoxy chloropropane and a catalyst, reacting at 80-100 DEG C for 3-7 hours, cooling to 50-70 DEG C, dropwise adding a strong alkali solution, reacting for 4-8 hours after dropwise adding, washing with deionized water, retaining an organic layer, and carrying out rotary evaporation on the organic layer to obtain the product. The rigidity, toughness and heat resistance of the modified nylon 6 prepared by applying the Schiff base epoxy oligomer chain extender are improved, and the modified nylon 6 still has processability similar to that of nylon 6.

The invention provides a nylon modified material as well as a preparation method and application thereof, and relates to the technical field of nylon compositing, the nylon modified material comprises the following components: nylon 66, low-viscosity nylon 6, a toughening agent, a compatilizer and a flow crystallization accelerant; wherein the toughening agent comprises a block copolymer containing a polyethylene glycol chain segment and a polydimethylsiloxane chain segment; the compatilizer comprises a compound containing a diglycidyl ether group. According to the nylon modified material provided by the invention, under the condition that the modulus of nylon 66 is slightly reduced, the impact strength is improved, so that the nylon modified material has the characteristics of high flowability, high toughness, self-lubrication and the like, and can meet the requirements of occasions such as automobile parts and industrial production.

The present invention belongs to the technical field of flame-retardant fabrics, and relates to a method for preparing a durable flame-retardant nylon 6 fabric based on a reactive phosphorus-sulfur flame retardant, specifically: after adding nylon 6 fabric to a finishing solution containing a reactive phosphorus-sulfur flame retardant, a free radical initiator and a solvent a, reacting at 75-85°C for 6-8h to obtain a durable flame-retardant nylon 6 fabric; the limiting oxygen index of the durable flame-retardant nylon 6 fabric is higher than 29.3%, the damaged length is lower than 10.5cm, no molten droplets are generated, and after 40 washes, it can still pass the vertical burning test, the damaged length is lower than 14.4cm, and no molten droplets are generated. The flame-retardant nylon 6 fabric prepared by the method of the present invention has good flame retardant effect and excellent water-washing resistance.

The present invention relates to a bimetallic layered hydroxide / phytic acid synergistic flame-retardant nylon 6 composite material and its preparation method and application, belonging to the technical field of flame retardant material synthesis. The composite material is prepared from nylon 6, bimetallic layered hydroxide and phytic acid. Wherein, the phosphate functional group in the phytic acid can chelate with the metal ion in the bimetallic layered hydroxide, thereby forming a novel flame retardant. When combustion occurs, the layered structure and thermal decomposition products such as metal oxides, metal phosphates, and carbon-containing aromatic network structure substances in the flame retardant help to suppress the release of smoke and toxic gases, and the release of metal ions and phosphorus-containing free radicals helps to suppress the spread of fire. Compared with pure nylon 6, the peak heat release rate and total heat release rate of the composite material are greatly reduced, the limiting oxygen index is greatly increased, and the vertical combustion test reaches V-0 level. At the same time, the raw material sources in the preparation method of the composite material are abundant, the operation is simple, and it is suitable for scaled-up production.