8345 results about "Polyamide" patented technology

The invention belongs to the technical field of gel materials, and particularly relates to aerogel powder for polyolefin modification and a preparation method and application thereof. The preparation method of the aerogel powder comprises the following steps: (1) preparing aramid nanofiber dispersion liquid; (2) preparing a polypyrrole coated aramid nanofiber dispersion liquid; (3) mixing polyamide acid and the polypyrrole coated aramid nanofiber dispersion liquid, and then carrying out partial imidization and solvent exchange to prepare hydrogel; and (4) carrying out freeze drying, thermal imidization and crushing to obtain the aerogel powder for polyolefin modification. The aerogel powder is a porous solid material formed by forming one-dimensional composite fibers from aramid nanofibers and polypyrrole and combining the one-dimensional composite fibers with polyimide resin. The aerogel powder and polyolefin resin are compounded to obtain the polyolefin resin composite material with high strength and antistatic property, and the polyolefin resin composite material can be widely applied to the fields of pipes, plates, grouting equipment parts, grouting bags and the like.

The invention belongs to the technical field of aerogel materials, and particularly relates to antistatic aerogel for 3D printing as well as a preparation method and application of the antistatic aerogel. The preparation method comprises the following steps: (1) dispersing inorganic nanoparticles modified by a silane coupling agent containing epoxy groups and an aniline monomer in an acidic solvent to obtain a monomer mixed solution; (2) stirring and dissolving polyamide in the monomer mixed solution; (3) initiating a reaction to obtain a polyaniline modified polyamide solution; and (4) freeze-drying to obtain the antistatic aerogel for 3D printing. By controlling synthesis conditions, a core-shell structure of acid-doped polyaniline coated inorganic nanoparticles is formed, and a good conductive path is formed in polyamide with a small addition amount of polyaniline. The antistatic aerogel for 3D printing can be applied to technologies such as photocuring molding and fused deposition of polyurethane resin in a 3D printing technology, and the antistatic property and the mechanical property of a 3D printed product are improved.

The invention belongs to the technical field of aerogel materials, and particularly relates to high-performance antistatic aerogel for 3D printing as well as a preparation method and application thereof. According to the invention, inorganic hollow nanoparticles are selected as a nucleating modifier for in-situ polymerization of aniline monomers in a polyamide solution, so that polyaniline-coated inorganic hollow nanoparticles are uniformly dispersed in polyamide, and the aerogel composite material with polyamide as a continuous phase and polyaniline-coated inorganic hollow nanoparticles as a conductive and reinforced phase is formed. The use of the hollow inorganic nanoparticles avoids the problem that the solid inorganic nanoparticles lose the characteristics of the inorganic nanoparticles due to high specific gravity and high surface energy, and easy agglomeration or adsorption with other substances in the preparation process of the solid inorganic nanoparticles. The inorganic hollow nanoparticles are adopted as a nucleating modifier, so that the problems of agglomeration of solid nanoparticles and dispersion in a polyamide matrix are well solved.

The invention relates to the technical field of polyamide materials, in particular to a high-heat-resistance bio-based polyamide material and a preparation method thereof, and the high-heat-resistance bio-based polyamide material comprises the following raw materials in parts by weight: 45-50 parts of PA56, 7-11 parts of a balance multi-effect agent doped with a filler modifier, 5-8 parts of a flame retardant, 4-7 parts of a silane coupling agent, 3-5 parts of an antioxidant and 2-4 parts of a lubricant. According to the bio-based polyamide material, the bio-based PA56 is adopted as a matrix, meanwhile, the flame retardant, the silane coupling agent, the antioxidant and the lubricant are added to serve as functional auxiliaries, the balance multi-effect agent doped with the filler modifier is added to be matched with the stable supplement agent, and the raw materials are blended, coordinated and jointly synergized, so that the flame retardant property of the bio-based polyamide material is improved, and the flame retardant property of the bio-based polyamide material is improved. The obtained bio-based polyamide material is harmoniously improved in dielectric loss, flame retardance and wear resistance, and meanwhile, the product is remarkable in weather resistance and high heat stability resistance.

The invention discloses an optimized preparation method of a high-strength flame-retardant polyamide-based composite material in the technical field of information, which comprises the following steps: in the preparation process of the composite material, acquiring online dispersed state monitoring data of a modified filler by using a laser particle size analyzer and an optical microscope, including particle size distribution, agglomeration degree and dispersion uniformity of the filler; according to online dispersion state monitoring data, parameter ranges of melt flow property characterization are determined, the parameter ranges comprise the shearing rate and the temperature, particle size distribution data are used for determining the shearing rate range, small particle size distribution corresponds to the high shearing rate range, and agglomeration degree data are used for determining the temperature range; the higher degree of agglomeration corresponds to a higher temperature range to promote the dispersion of the filler, and these parameters are directly used to guide the setting of the subsequent rheological test.

The invention relates to the technical field of coatings, and discloses an amino-terminated ether-containing hyperbranched polyamide modified epoxy resin coating, which comprises a component A: 100 parts of a water-borne epoxy resin emulsion, 5-20 parts of titanium dioxide, 1-2.5 parts of a dispersant, and 0.05-0.2 part of an antifoaming agent; the component B is prepared from 50 to 70 parts of amino-terminated ether-containing hyperbranched polyamide; the amino-terminated ether-containing hyperbranched polyamide contains an active amino-terminated group, so that the amino-terminated ether-containing hyperbranched polyamide is used as a curing agent and is subjected to a cross-linking curing reaction with epoxy resin, the hyperbranched polyamide has a three-dimensional branched network structure and forms a spatial cross-linked interpenetrating network system with the epoxy resin, and the hyperbranched polyamide contains a flexible ether-containing chain segment and an alkyl chain segment, so that the cross-linking property of the hyperbranched polyamide is improved. The epoxy resin coating has a good toughening effect, improves the impact resistance and impact strength of an epoxy resin coating layer and a casting body thereof, and keeps high hardness and tensile strength at the same time.

The invention relates to the technical field of epoxy resin paint, and discloses waterborne epoxy paint suitable for containers and a preparation method of the waterborne epoxy paint. A component A of the waterborne epoxy paint comprises, by weight, 100 parts of waterborne epoxy resin and 0.5-0.8 part of a flash rust inhibitor; the component B comprises 6-8 parts by weight of a polyamide curing agent, 5-12 parts by weight of an organosilicon sulfonate polyurethane toughening agent and 0.2-1 part by weight of graphene oxide; the organic silicon polyurethane flexibilizer can play a role of a dispersing agent, the dispersity of graphene in the waterborne epoxy paint is improved, the main chain of the organic silicon polyurethane flexibilizer contains imino groups, the organic silicon polyurethane flexibilizer can be subjected to a curing reaction with epoxy resin, a flexible organic polysiloxane molecular chain is bonded into an epoxy resin molecular chain, and the flexibility of the waterborne epoxy paint is improved. A good toughening effect is achieved, so that the flexibility, the impact resistance and the corrosion resistance of a paint film are improved.

The invention discloses a bamboo powder-containing biodegradable plastic for food contact and a preparation method thereof, and relates to the technical field of bio-based materials. The bamboo powder-containing biodegradable plastic for food contact comprises chitosan starch and modified bamboo powder, the chitosan starch is prepared by adding composite chitosan and amino-terminated polyethylene glycol into oxidized corn starch, and the composite chitosan is prepared by grafting chlorogenic acid on the surface of chitosan and then coating succinic anhydride derivatives. The succinic anhydride derivative is prepared from dodecenyl succinic anhydride and 1, 4-butanediamine through a reaction, so that the plastic has the antibacterial property, and meanwhile, the mechanical property is enhanced; the modified bamboo powder is prepared by reacting bamboo powder with a carboxyl-terminated composition, and the carboxyl-terminated composition comprises carboxyl-terminated polylactic acid and carboxyl-terminated polyamide. The toughness of the plastic is enhanced, and the mechanical property of the plastic is further enhanced.

The invention provides a polyamide composite material and application thereof. The polyamide composite material comprises the following components in parts by mass: 35-82 parts of polyamide resin, 5-45 parts of a reinforcing material and 5-25 parts of an organic phosphonate flame retardant, the water-soluble acid value of the organic phosphonate flame retardant is 0.1 to 0.3 mg KOH / g. By adopting the organic phosphonate flame retardant with a low acid value, the generation of dialkyl phosphinic acid decomposed in a high-temperature process can be slowed down, so that the amount of mold scale generated in an injection molding process of the polyamide composite material is obviously reduced, and the injection molding production efficiency is improved; meanwhile, the polyamide composite material has the advantages that the content of water boiling precipitates is obviously reduced, the damp-heat-resistant stability is excellent, and the service life of the polyamide composite material under damp-heat conditions is prolonged.

The invention relates to an antistatic MLCC release film base film and a preparation method thereof. The antistatic MLCC release film base film is prepared by melt blending and biaxial stretching of PET master batch, an antistatic composition and a nano filler, wherein the antistatic composition is prepared by compounding modified PET-PEG and thiophene modified aromatic polyamide; the nano filler is prepared by carrying out melt extrusion on KH550 modified talcum powder and MAH-g-PET (maleic anhydride-grafted polyethylene terephthalate). The antistatic composition disclosed by the invention has the beneficial effects that the antistatic composition is formed by interweaving two polymers, and a stable three-dimensional conductive network is constructed in the PET film, so that the antistatic performance is more efficient, lasting and stable. In addition, through chemically bonded modified talcum powder, the smoothness and low roughness are provided, and meanwhile reinforcing and toughening are achieved; and the single-layer extrusion process can realize ultrathin thin film, the production process is simplified, and the production cost is greatly reduced.

The invention discloses a preparation method and application of a water-based polyamide acid sizing agent, and belongs to the technical field of sizing agents. The method comprises the following steps: synthesizing polyamic acid in an organic solvent by adopting dianhydride and diamine in a polymerization manner, after the reaction is finished, cooling a polyamic acid solution to room temperature, transferring into a dropping funnel, dropwise adding into a solvent of which the volume is 10-25 times that of the solution, separating, completely dropwise adding, collecting a precipitate, and drying to obtain solid polyamic acid; and adding a low-grade ester or low-grade ketone solvent into the deionized water, adding the polyamide acid powder into the mixed solvent according to the solid content of 1-20wt.%, stirring at room temperature until the solid disappears, and standing for liquid separation to obtain a lower layer which is the polyamide acid water-based sizing agent. The sizing agent disclosed by the invention shows excellent dispersity and long-term stability. After sizing, polyamide acid on the surface of the carbon fiber is converted into polyimide through a thermal imidization reaction, so that the carbon fiber has high thermal stability and excellent compatibility.

The invention discloses a preparation method of antistatic modified chinlon filaments, and relates to the field of chinlon filaments. When the antistatic modified chinlon filament is prepared, (formylmethyl) diethyl phosphate and 1-aminopyrrole react to prepare pyrrole diethyl phosphate; reacting the hydroxylated multi-walled carbon nanotube with pyrrole diethyl phosphate to obtain a modified multi-walled carbon nanotube; the preparation method comprises the following steps: reacting 2, 2 '-bipyridine-5, 5'-dicarboxylic acid with 2-amino-5-nitrophenol, and then reducing to obtain a benzoxazole diamine monomer; then, adipic acid, 1, 5-diaminopentane and a benzoxazole diamine monomer are subjected to a reaction, and modified polyamide is prepared; uniformly mixing the modified polyamide, the modified multi-walled carbon nanotubes, pyrrole, ferric trichloride and copper chloride, and performing melt spinning to obtain the antistatic modified polyamide filament. The antistatic modified chinlon filament prepared by the invention has excellent antistatic, flame-retardant, anti-aging and mechanical properties.

The invention provides a preparation method of an h-BN / PI high-temperature-resistant anticorrosive coating, and relates to the technical field of polymer composites.The preparation method of the h-BN / PI high-temperature-resistant anticorrosive coating comprises the steps that under the protection of inert atmosphere, aromatic diamine containing impurity element five-membered rings and aromatic dianhydride containing ether bonds are taken and subjected to a polymerization reaction in a polar aprotic solvent, and the h-BN / PI high-temperature-resistant anticorrosive coating is obtained. A polyamide acid solution is obtained; performing ultrasonic-assisted liquid phase stripping on the micron-sized hexagonal boron nitride to obtain single-layer hexagonal boron nitride; adding the single-layer hexagonal boron nitride into the polyamide acid solution for multiple times, and uniformly stirring to obtain a hexagonal boron nitride / polyimide composite solution; and coating the hexagonal boron nitride / polyimide composite liquid on a to-be-coated surface, and carrying out gradient heating curing to obtain the h-BN / PI high-temperature-resistant anticorrosive coating. The h-BN / PI high-temperature-resistant anticorrosive coating based on interaction of multiple hydrogen bonds has relatively good high temperature resistance, relatively good resistance mechanical property and excellent corrosion resistance.

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 a PA6 nylon composite material for a high-temperature-resistant filter screen and a preparation method of the PA6 nylon composite material, and relates to the technical field of composite materials. The invention discloses a PA6 nylon composite material for a high-temperature-resistant filter screen. The nylon material is prepared from the following raw materials in parts by weight: 60 to 80 parts of modified PA6 nylon, 10 to 20 parts of modified glass fiber, 2 to 5 parts of montmorillonite, 0.3 to 0.8 part of antioxidant 1010, 0.2 to 0.6 part of stearic acid, 0.5 to 1.0 part of ethoxylated fatty amine, 1 to 3 parts of nano titanium dioxide, 1 to 3 parts of polytetrafluoroethylene micro powder, 3 to 8 parts of aluminum hydroxide, 0.5 to 1.5 parts of chitosan, 1 to 3 parts of hyperbranched polyamide and 0.5 to 1.5 parts of urea-formaldehyde resin coated epoxy resin microcapsules. And 0.3 to 0.8 part of sodium polyacrylate. The PA6 nylon composite material for the high-temperature-resistant filter screen has remarkable advantages. The material disclosed by the invention is high in mechanical property, good in thermal stability and stable in size at high temperature; the self-cleaning, antibacterial and antistatic functions are realized, and the filtering efficiency is high; chemical corrosion resistance, wear resistance and low water absorption are achieved; part of the raw materials can be recycled, the environmental protection concept is met, and the use requirement of the high-temperature-resistant filter screen in a complex environment can be met.

The invention provides a 3D printing foaming part and a preparation method and application thereof, and belongs to the technical field of 3D printing. According to the method for 3D printing of the foaming part, polyamide powder serves as a raw material, the 3D printed part is prepared, then the 3D printed part is subjected to supercritical fluid kettle pressure foaming, and the 3D printed foaming part is obtained. By controlling the melting point and the average particle size of the polyamide powder, the printing temperature and the solubility of supercritical fluid in the 3D printing foaming part, the 3D printing foaming part with high rebound resilience, bending resistance and hydrolysis resistance is obtained, and the 3D printing foaming part has wide application prospects in the field of foaming shoe materials.

The invention discloses a high-performance composite solvent-resistant nanofiltration membrane with a rigid twisted non-planar structure polyamide layer and a preparation method of the high-performance composite solvent-resistant nanofiltration membrane. The preparation method comprises the steps of preparation of the rigid twisted non-planar structure polyamide layer and surface modification. A water phase solution containing adamantane diamine and m-phenylenediamine and an organic phase solution containing 1, 3, 5-trimesoyl chloride and acetone are subjected to interfacial polymerization reaction to prepare a polyamide layer with a rigid twisted non-planar structure, and then a polyphenol modifier is used for carrying out hydrophilic modification on the polyamide layer, so that the rigid twisted non-planar structure is obtained. The pure water permeability and retention rate of the solvent-resistant nanofiltration membrane are obviously improved; due to the introduction of adamantane diamine, the interfacial polymerization process and the formation of a polyamide layer are remarkably regulated and controlled, and the separation performance of the solvent-resistant membrane is greatly improved on the premise that the interception performance of the membrane is hardly reduced; the preparation process is simple, and the prepared membrane is excellent in performance and has a good application prospect in the aspect of organic solvent separation.

Provided is an electroconductive sheet 10 comprising an aromatic polyamide pulp, a fluororesin, a carbon-based electroconductive substance, and an electrode catalyst. Also provided is a production method for the electroconductive sheet, the method comprising: a step X1, in which a slurry X1 including an aromatic polyamide pulp, a fluororesin, a carbon-based electroconductive substance, and an electrode catalyst is prepared and the slurry X1 is formed into a sheet by wet laying to obtain an electroconductive-sheet precursor X1; and a step Y1, in which the electroconductive-sheet precursor X1 is hot-pressed in air at a temperature of 100-350°C and a linear pressure of 10-50 N / m and thereafter fired in an inert gas at 200-500°C. Use may be made of a method in which either one of a slurry X2-1 containing no electrode catalyst and a slurry X2-2 containing the electrode catalyst is formed into a sheet by wet laying to obtain the electroconductive-sheet precursor, and the other slurry is formed into a sheet by wet laying on one surface of the electroconductive-sheet precursor.

The invention discloses CPVC (Chlorinated Polyvinyl Chloride) modification-based high-wear-resistance antistatic plastic and a preparation method thereof, belongs to the technical field of composite CPVC preparation, and aims to solve the technical problem that the wear resistance and the antistatic property of CPVC-based plastic in the prior art need to be further improved. The high-wear-resistant antistatic plastic based on CPVC modification comprises the following raw materials in parts by weight: 80-100 parts of modified CPVC, 6-8 parts of a modified heat stabilizer and 8-16 parts of an auxiliary material, the amino group on the surface of the prepared antistatic filler participates in the ammoniation process of the prepared CPVC, a large number of amino groups hybridize the chain segment structure of the CPVC and introduce tertiary amino groups, and an ion structure is introduced into the hybridized CPVC through quaternary ammonium salinization to obtain the modified CPVC. The CPVC-based plastic is obtained by mixing, melting and extruding the CPVC-based plastic, the prepared polyamide acid-based modified heat stabilizer and auxiliary materials.

The invention belongs to the field of electrode paste preparation, and provides low-temperature curing silver-coated copper paste for a heterojunction solar cell and a preparation method of the low-temperature curing silver-coated copper paste. Ethyl cellulose is adopted as a matrix material, a stable matrix network is provided for slurry through good cohesiveness and dispersity of ethyl cellulose, and a network structure with a high crosslinking degree is formed by adding modified phenolic resin, organic silicon modified epoxy acrylate and other chemical modification materials into the slurry. The mechanical strength and adhesive force of the slurry are further enhanced, surface modification is carried out on inorganic filler such as silver-coated copper powder and bismuth oxide through a silane coupling agent and a titanate coupling agent, and the interface bonding force between the filler and an organic matrix is enhanced through silicon-oxygen bonds formed on the surface of the filler; by adding the carboxylated polyamide wax and the organic bentonite, the agglomeration tendency of the filler is reduced by utilizing the adsorption and electrostatic repulsion effects of the carboxylated polyamide wax and the organic bentonite on filler particles, and the obtained conductive slurry has the characteristics of excellent conductivity and low-temperature rapid curing.

The present invention relates to the technical field of nanofiltration membranes, and particularly relates to a preparation method for a positively charged nanofiltration membrane for improving a "trade-off" effect. The preparation method comprises the following process: sequentially adding a water phase and an oil phase to the surface of a support layer to perform a reaction, so as to prepare a polyamide layer; pouring in a functionalized graphene dispersion; and sequentially placing same into an N,N-dimethyl propane diamine solution, a sodium borohydride solution and an iodomethane solution to perform a reaction, so as to obtain a nanofiltration membrane, wherein the functionalized graphene is pyrrolidone-based graphene. According to the present invention, a mixture of piperazine and polyethyleneimine is used as a water phase and is subjected to interfacial polymerization with an oil phase 1,3,5-trimesoyl chloride on the surface of the support membrane; and by means of the compounding of micromolecular piperazine and macromolecular polyethyleneimine, the rapid formation of a polyamide layer is promoted, the distance of a system cross-linked network is increased, a positively charged polyamide layer having a large pore diameter and good hydrophilicity is formed, and a good water flux and a good rejection rate are achieved, thereby improving the "trade-off" effect.

The invention discloses liquid crystal polyimide aerogel with excellent shape memory performance and a preparation method of the liquid crystal polyimide aerogel, and belongs to the field of polymer aerogel materials. According to the liquid crystal polyimide aerogel with the excellent shape memory performance, the shape fixing rate is larger than or equal to 99%, and the shape recovery rate is larger than or equal to 97%; the heat conductivity at the room temperature is larger than or equal to 0.09 W m <-1 > K <-1 >; specifically, liquid crystal diamine, flexible diamine, a liquid crystal dianhydride monomer and a thermal curing agent are subjected to a reaction and solvent replacement, and polyamide acid dry filaments are obtained; and forming an aqueous solution from the dry polyamide acid filaments, injecting the aqueous solution into a silica gel mold, carrying out directional freezing casting on a customized freezing circulating device with a copper plate at the top, and carrying out freeze drying, thermal imidization and curing after molding, so as to obtain the liquid crystal polyimide aerogel with excellent shape memory performance.

The invention discloses a high-weather-resistance halogen-free flame-retardant polyamide composite material and a preparation method thereof, and belongs to the technical field of high polymer materials. The composite material comprises the following raw materials in parts by weight: 20-60 parts of polyamide resin A, 0-20 parts of polyamide resin B, 10-50 parts of glass fibers, 0.1-2 parts of an ultraviolet absorbent, 0.1-2 parts of a free radical scavenger, 10-20 parts of a halogen-free flame retardant, 1-15 parts of a flame retardant synergist and 0.5-5 parts of a conventional auxiliary agent. The preparation method comprises the following steps: uniformly mixing the polyamide resin A, the polyamide resin B, the ultraviolet absorbent, the free radical scavenger, the flame-retardant synergist and the conventional auxiliary agent in a high-speed mixer according to the proportion to obtain a mixture, then adding the mixture into a double-screw extruder through main feeding, side feeding of the halogen-free flame retardant through a first side feeding and side feeding of the glass fiber through a second side feeding, and carrying out extrusion molding to obtain the flame-retardant polyamide composite material. And carrying out melt blending and extrusion granulation to obtain the high-weather-resistance halogen-free flame-retardant polyamide composite material. The obtained high-weather-resistance halogen-free flame-retardant glass fiber reinforced polyamide composite material is excellent in mechanical property, flame retardance and weather resistance.

The invention relates to the technical field of drilling fluid cooling, and discloses a phase change microcapsule suitable for drilling fluid cooling and a preparation method thereof.The phase change microcapsule comprises a capsule wall stabilizing material and a capsule core phase change material, and the capsule wall stabilizing material comprises polyurethane, polyurea, polyamide, polyimide, polystyrene and a first organic solvent; the capsule core phase change material comprises paraffin, fatty acid, polyol, inorganic hydrated salt, polymer gel, expanded graphite, carbon nanotubes, metal nanoparticles and a second organic solvent, and the first organic solvent is at least one of toluene, xylene, cyclohexanone and the like. The temperature of the drilling fluid is kept at a relatively low level, the cooling of the drilling fluid is realized, so that the drilling efficiency is improved, harmful solvents and additives are not used in the preparation process of the phase-change microcapsules, the phase-change microcapsules are pollution-free to the environment, and the requirements of greenness and environmental protection are met.

The invention discloses a high-barrier degradable composite film and a preparation method thereof, and belongs to the field of film manufacturing. 15 to 30 parts of PBAT; 15 to 30 parts of PPC; 1 to 10 parts of montmorillonite; 0.2 to 1 part of an epoxy chain extender; 0.2 to 0.5 part of an aliphatic alcohol chain extender; and 1.5-15 parts of a low molecular weight aliphatic polyamide substance. According to the invention, biodegradable materials PLA, PBAT and PPC with excellent performance are selected as base materials, and a certain amount of auxiliary agents are added to modify and prepare the high-barrier degradable composite film. The prepared composite film has the advantages of high strength, high toughness, high barrier property, low cost, high biodegradability and the like. Besides the field of mulching films, the film can also be widely applied to high-end packaging fields with high barrier property requirements, such as packaging of high-tech fine instruments, food and medicine industries and the like, and the preparation method is simple, economical and environment-friendly.

The invention discloses a flame-retardant nylon material as well as a preparation method and application thereof, relates to the technical field of flame-retardant high polymer materials, and solves the problems that a flame-retardant nylon material prepared by a blending method is unstable in flame-retardant effect and a flame-retardant nylon material prepared by a copolymerization method is complex in process. The preparation method comprises the following steps: carrying out ring-opening copolymerization on a seven-membered ring lysine derivative monomer formed by ring formation of lysine and other lactam monomers to obtain copolyamide with a functional group on a side chain, and reacting a reagent containing a flame-retardant group with the functional group to prepare the flame-retardant nylon material. The flame-retardant nylon material prepared by the invention can effectively avoid migration and loss of the flame retardant, improve the dispersity of the flame retardant and enhance the flame-retardant effect. Meanwhile, 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 production cost and the like. The flame-retardant nylon material disclosed by the invention has lasting and stable flame-retardant performance and can be widely applied to the fields of automobiles, textiles, electronics and electricity, buildings, packaging and the like.

The invention discloses an ionic liquid modified polyimide nanofiber film and an air purification filter screen based on the ionic liquid modified polyimide nanofiber film, and belongs to the technical field of film filtering materials. The preparation method comprises the following steps: firstly, selecting a diamine monomer and a dianhydride monomer to carry out low-temperature polycondensation reaction, and then carrying out solvent replacement and freeze drying to obtain polyamide acid powder; dissolving the powder to obtain a polyamide acid spinning solution, preparing an ionic liquid / polyamide acid spinning solution on the basis, and carrying out electrostatic spinning to obtain an ionic liquid / polyamide acid nanofiber membrane; and finally, carrying out high-temperature thermal imidization treatment to prepare the ionic liquid / polyimide nanofiber membrane. The method is simple and efficient, the problems of low resistance, high pressure drop and the like of a traditional nanofiber film in air filtration are solved, development and application of the nanofiber film in the field of air filtration are further widened, and the nanofiber film has important scientific significance and application value in the fields of high-temperature filtration, gas adsorption and the like.

The present application belongs to the field of polymer material technology, and in particular, relates to a polyimide composite material, a preparation method thereof, and an application thereof. The preparation method of the polyimide composite material comprises the steps of: preparing a polyamic acid slurry from a diamine monomer, a dianhydride monomer, and an organic solvent; preparing a mixed slurry from the polyamic acid slurry and a nanomaterial, and then performing a spinning imidization treatment to obtain a polyimide composite material; wherein the nanomaterial comprises at least one of nano silicon carbide, aluminum nitride, carbon nanotubes, graphene, and nano silicon dioxide. By blending polyimide with other nanomaterials having high thermal conductivity to improve its thermal conductivity, the thermal conductivity of the polyimide composite material is optimized and improved, and its heat dissipation capacity in a high temperature working environment is enhanced, while having high tensile strength and thermal conductivity. The service life of the polyimide composite material is extended, and its application range can be further expanded, such as in the back panel assembly of a smartphone.

The invention discloses an anti-shrinkage light, soft and elastic sole foaming material and a preparation method thereof, and belongs to the technical field of footwear products. The light, soft and elastic sole foaming material is formed by chemically foaming an EVA (Ethylene Vinyl Acetate) composite raw material, the EVA composite raw material is prepared from 50 to 70 parts of EVA, 20 to 40 parts of olefin thermoplastic elastomer, 10 to 20 parts of styrene elastomer, 1.5 to 3 parts of maleic anhydride grafted ethylene-octylene copolymer compatilizer, 0.4 to 0.8 part of peroxide cross-linking agent, 3 to 4 parts of foaming agent, 1 to 1.5 parts of zinc oxide, 1 to 1.5 parts of polyethylene wax substance and 0.5 to 1.5 parts of poly (butylene succinate). 0.3 to 1 part of polyamide 12 microspheres and 2 to 3 parts of nano montmorillonite. The foaming material can resist shrinkage when being used as a shoe sole part, and has good rebound performance and the like, so that the high-quality requirement of sneakers, the mass production stability and the like are met.

The invention belongs to the technical field of high-temperature-resistant coatings, and particularly relates to a core-shell polyimide-based high-temperature-resistant water-based coating and a preparation method thereof. Comprising the following components in percentage by mass: 35-38% of a core-shell emulsion; the core layer is polyimide resin; the transition layer is an organic silicon emulsion modified by 5, 6-dimethyl benzimidazole and a silane coupling agent KH-550; the shell layer is made of polyamide-imide resin; 28%-32% of a modified high-temperature filler; 6%-7.5% of a functional auxiliary agent; and the balance of deionized water. Through core-shell emulsion gradient design, multi-scale filler cooperation and a low-temperature gradient curing process, the high temperature resistance, the adhesive force and the environmental protection property of the coating are improved.