701 results about "Polymer composite materials" patented technology

The invention relates to the technical field of functional polymer composite materials, and provides diatomite modified composite super absorbent and rapid absorbent resin and a preparation method thereof. The preparation raw materials of the diatomite modified composite high-water-absorption and rapid-water-absorption resin provided by the invention comprise acrylic acid, acrylamide, sodium hydroxide, N, N '-methylene bisacrylamide, ammonium persulfate and modified diatomite. The diatomite is modified by the silane coupling agent, the agglomeration problem of the diatomite is solved, the compatibility with organic monomers is improved, and the modified diatomite, acrylic acid and acrylamide are utilized to construct an organic-inorganic synergistic three-dimensional porous network structure, so that the resin has ultrahigh water absorption rate, rapid water absorption performance and good water retention stability. Meanwhile, the preparation method disclosed by the invention does not need nitrogen protection, has the advantages of simple process, controllable raw material cost and easiness in industrial mass production, and is suitable for multiple fields such as water-saving agriculture, soil moisturizing, landscaping and the like.

The invention relates to the technical field of polymer composite materials, in particular to a carbon fiber reinforced nylon 66 / polyphenylene sulfide composite material and a preparation method thereof.The carbon fiber reinforced nylon 66 / polyphenylene sulfide composite material is prepared from, by weight, 40-55 parts of nylon 66, 30-45 parts of polyphenylene sulfide, 15-30 parts of carbon fibers, 5-6 parts of compatilizer, 0.8-1.2 parts of antioxidant and 3-4 parts of flexibilizer, the flexibilizer is ethylene-octylene copolymer grafted maleic anhydride, the grafting rate is 1.2-1.5%, the flexibilizer is ethylene-octylene copolymer grafted maleic anhydride, the grafting rate is 0.8-1.0%, and the antioxidant is a mixture of an antioxidant 1010 and an antioxidant 168 according to a mass ratio of 1: 1. The composite material prepared by the invention is suitable for medium-high temperature scenes, not only solves the problems of insufficient high temperature resistance and poor mechanical properties of traditional materials, but also has good processability and environmental tolerance.

The invention belongs to the technical field of polymer composite materials, and discloses a carbon fiber interface modifier aided design method and system based on collaborative optimization, and the method is used for designing a carbon fiber interface modifier based on collaborative optimization of machine learning and molecular dynamics simulation. By constructing a closed loop iteration process of generation-prediction-verification-learning, interfacial modifier molecules meeting multi-target performance requirements are quickly and accurately obtained under the condition that a large amount of early-stage chemical synthesis and experimental screening are not needed. According to the method, through deep combination of high-throughput prediction of machine learning and virtual experiment verification of molecular dynamics, efficient and automatic design of the interface modifier molecules is achieved, experimental synthesis and trial and error links are greatly reduced, the research and development efficiency is improved, and the method is widely suitable for design and optimization of the interface modifier molecules of the carbon fiber / resin-based composite material.

The invention relates to the technical field of polymer composite materials, and discloses a refining treatment method of a bamboo fiber ultra-nano micro powder and natural polymer blended material, which comprises the following steps: (a) premixing bamboo fiber ultra-nano micro powder and a deep eutectic solvent to obtain a premix and realize in-situ activation; (b) adding the premix and a natural polymer matrix from a main feed port of a double-screw extruder; and (c) in the melt blending process, adding a dynamic interface locking agent through a side feeding port arranged at the downstream of the main feeding port, and then extruding and granulating. A staged dynamic compatibilization process is adopted, a hydrogen bond network of bamboo fibers is destroyed by using a deep eutectic solvent to promote shearing dispersion of the bamboo fibers in the front section, and stable interface bonding is constructed in the rear section through a dynamic interface locking agent after dispersion is completed. The method synergistically solves the conflict between dispersion and interfacial compatibilization, so that the composite material has good comprehensive performance.

The invention belongs to the technical field of polymer composite materials, and particularly relates to an efficient flame-retardant low-toxic-gas-release silicone rubber composite material and a preparation method thereof. The high-efficiency flame-retardant low-toxic-gas-release silicone rubber composite material comprises the following components in parts by weight: 100 parts of methyl vinyl silicone rubber; 10 to 20 parts of ZIF-67 modified by polysiloxane; 5-10 parts of modified nano molybdenum oxide; 5 to 10 parts of melamine cyanurate; 40 to 50 parts of mesoporous SiO2 aerogel; 1-3 parts of hydroxyl silicone oil; 0.5 to 1.5 parts of a vulcanizing agent; and 0-5 parts of an auxiliary agent. The flame-retardant and smoke-suppression performance of the silicone rubber composite material is remarkably improved through material technology innovation, and meanwhile, the mechanical property and the high temperature resistance are improved.

The invention belongs to the technical field of polymer composite materials, and particularly relates to a high-strength bismaleimide resin material and a preparation method thereof. The bismaleimide resin composition comprises the following components in parts by weight: 50-60 parts of bismaleimide resin, 40-50 parts of an allyl compound, 1-3 parts of modified graphene and 0.1-0.5 part of a dispersing filler, the dispersing filler is prepared from modified inorganic nanoparticles and modified tetrapod-like zinc oxide whiskers in a mass ratio of (0.1-1): 1. Wherein the tetrapod-like zinc oxide whiskers can promote the dispersion of the graphene with a large lamellar structure from the macroscopic aspect, so that the graphene is uniformly dispersed in a bismaleimide resin matrix, and the inorganic nanoparticles can play a role in lubrication and isolation, so that the agglomeration among graphene lamellas in a small range is prevented. By adding the graphene composite reinforcing filler, the rigidity of the bismaleimide resin material is improved, and the toughness of the composite material can be improved at the same time.

The invention belongs to the technical field of polymer composite materials, and particularly relates to a polycarbonate modified composite material as well as a preparation method and application thereof, and the polycarbonate modified composite material comprises 60-85 parts of a PC base material, 10-30 parts of a bio-based monomer, 1-8 parts of surface modified nano cellulose and 0.1-2 parts of a transesterification catalyst. According to the polycarbonate modified composite material as well as the preparation method and the application thereof provided by the invention, chemical bonding of a bio-based monomer and a PC main chain is realized through transesterification, phase separation is avoided, and the core pain point of traditional blending modification is solved; the biodegradation rate is increased by 30% or above compared with pure PC, and meanwhile, the excellent mechanical properties (the tensile strength is larger than or equal to 60 MPa, and the notch impact strength is larger than or equal to 5 kJ / m) of PC are reserved; the melt flow rate is increased by more than 25%, the processing energy consumption is reduced, and the application scene is widened; the carboxylic acid modified nano cellulose and the block copolymer form a synergistic network, so that the mechanical property, the thermal stability and the degradation uniformity are synchronously improved.

The application discloses a kind of nanocellulose modified acrylic water-based emulsion and its preparation method and application, it is related to the technical field of polymer composite.A kind of modified acrylic water-based emulsion includes 180-220 parts of acrylate monomer, 45-60 parts of functional monomer, 3-5 parts of nanocellulose liquid, 4-6 parts of emulsifier, 1.5-2 parts of initiator, 2-3 parts of sodium bicarbonate and 275-300 parts of deionized water, wherein functional monomer includes hydroxy acrylate, acrylonitrile and fluorine-containing acrylate.By using fluorine-containing acrylate with nanocellulose to modify acrylic emulsion, water-based emulsion with good film-forming performance can be prepared, and the formed coating has good adhesion, stain resistance, heat oil resistance and mechanical strength, if the water-based emulsion is applied to the surface modification of filter material, not only can improve the hand feeling of filter material, but also can improve the stain resistance and service life of filter material surface.

The invention relates to the technical field of photo-thermal gas treatment, in particular to a pH response type conjugated polymer nano-composite particle as well as a preparation method and application thereof, and develops a conjugated polymer nano-composite particle IN-20-(NH4) 2S capable of intelligently responding to acidic pH in a tumor microenvironment, which is used for photo-thermal and gas synergistic treatment of tumors. The nanoparticles generate heat under NIR-II light induction to promote the conjugated polymer composite material to release (NH4) 2S, the (NH4) 2S responds to acidic pH and can react with acid to generate H2S, the concentration of the (NH4) 2S is gradually increased along with time, the release amount of the (NH4) 2S is more remarkable under the illumination condition, and a new strategy is provided for enhancing the accuracy and effectiveness of tumor treatment.

The invention belongs to the technical field of polymer composite materials, and discloses a large-scale preparation method of a PPS-based composite material with low expansion and high dimensional stability. According to the method, a multi-scale synergistic enhancement system of graphene and nano silicon dioxide is constructed, a maleic anhydride grafted PPS compatilizer is introduced into melt blending, and interface chemical anchoring is achieved through amino-maleic anhydride-epoxy ternary reaction. The filler is premixed according to the mass ratio of 1: 1 after being subjected to surface functionalization, the total content is 15-30 wt%, and the composite material is obtained through twin-screw reactive extrusion and injection molding. The invention provides the large-scale preparation method of the low-expansion high-dimensional-stability PPS-based composite material which is reasonable in structural design, high in process controllability, excellent in performance index and suitable for industrial production, and the problem that thermal expansion suppression and interface strengthening are difficult to consider at the same time in the prior art is solved.

The invention belongs to the technical field of biomass composite material processing, and discloses a plant fiber-polymer composite material and a preparation method thereof. The plant fiber-polymer composite material is prepared from the following raw materials in parts by mass through plasticizing extrusion molding: 50 to 88 parts of plant fibers, 0.5 to 8 parts of a biomass cross-linking agent, 0.5 to 5 parts of a low-temperature water-soluble polymer, 10 to 50 parts of water and 0.05 to 3 parts of metal ions, wherein the metal ions and the biomass cross-linking agent form a reversible cross-linked network in the system through coordination; due to the existence of the reversible cross-linked network, the composite material can be plasticized and continuously extruded and molded under the shearing action at the temperature of 20-70 DEG C. The metal ion-biomass cross-linking agent coordination network provides high structural strength in a static state and is reversibly dissociated in a shear field, so that shear-driven plasticizing of a high-viscosity and high-fiber-content system in a low-temperature interval of 20-70 DEG C is realized.

The invention discloses an AI-driven polymer composite material process optimization method, and aims to solve the problems of data islands, process optimization lag and insufficient model timeliness in a polymer material production process. The method comprises the following steps: collecting full-link data according to a six-level customer product coding specification; the state parameters of the high-frequency equipment are safely stored in the sub-table 1 through encryption and identity authentication; constructing a structured database based on the production batch number association main table, the raw material sub-table set, the sub-table 2 and the sub-table 3; training a multi-model artificial intelligence system fusing gradient boosting regression, Bayesian optimization, a neural network and a random forest, and realizing a bidirectional linkage closed loop of formula recommendation, process optimization and performance prediction; and incremental learning is carried out by adopting a sliding window mechanism in combination with an online gradient descent and elastic weight consolidation strategy. According to the technical scheme, intelligent, efficient and safe optimization of the high polymer material process can be achieved, and the product quality and the production efficiency are remarkably improved.

The invention relates to the technical field of polymer composite materials, and provides a composite water-retaining agent based on charcoal and bentonite as well as a preparation method and application of the composite water-retaining agent. The composite water-retaining agent provided by the invention is prepared from the following raw materials: acrylic acid, 2-acrylamido-2-methyl-1-propanesulfonic acid, acrylamide, sodium hydroxide, N, N '-methylene bisacrylamide, ammonium persulfate, modified bentonite and corn straw biochar. The composite water-retaining agent provided by the invention has excellent salt resistance, water holding capacity and structural stability, and the water absorbency in pure water and a 0.9% NaCl solution respectively reaches 2547.30 g / g and 164.45 g / g; when the soil conditioner is applied to saline-alkali soil, the maximum water holding capacity of the soil can be remarkably improved. The preparation process is simple, the cost is low, and the method has important practical significance on promoting ecological environment restoration of the arid mining area and realizing coordinated development of mineral resource development and environmental protection.

The invention provides an epoxy resin wear-resistant coating and a preparation method thereof, and belongs to the technical field of polymer composite materials. The epoxy resin wear-resistant coating is prepared from the following raw materials in parts by mass: 100 parts of epoxy resin, 2 to 20 parts of composite filler, 5 to 30 parts of curing agent, 0.2 to 4 parts of defoaming agent and 0.5 to 5 parts of flatting agent, the composite filler is PTFE and a modified inorganic filler; the modified inorganic filler is a compound system of modified nano SiO2, modified nano ZnO, modified MoS2 and modified nano Al2O3. According to the invention, the antifriction material and the reinforcing material are compounded, and the silane coupling agent is used for surface modification, so that firm combination of the filler and the epoxy resin matrix is realized. MoS2 and PTFE provide a continuous lubricating effect, and the friction coefficient is reduced; the hardness, the strength and the bearing capacity of the coating are remarkably improved through the nano oxide particles, and the coating has the characteristics of low friction and high wear resistance through the synergistic effect of the nano oxide particles and the coating.

The invention discloses a composite material containing siloxane benzoxazine interface modified basalt fibers and a preparation method of the composite material, and belongs to the technical field of polymer composite materials. Benzoxazine is adopted for surface grafting modification of basalt fibers for the first time, and the composite material is prepared through the following steps that firstly, a piranha solution is used for treating the surfaces of the basalt fibers, so that a large number of hydroxyl groups are formed on the surfaces of the basalt fibers; and then siloxane-containing benzoxazine is hydrolyzed and grafted on the hydroxyl on the surface of the fiber. According to the method, not only is the surface roughness of the fiber increased, but also a crosslinkable oxazine ring group is introduced. In the heating curing process, the oxazine ring is subjected to ring-opening reaction, and forms a cross-linked structure with the basalt fiber and the epoxy resin, so that the interface bonding force between the fiber and the resin is remarkably enhanced. In addition, flexible aliphatic chains contained in the siloxane-containing benzoxazine can improve the toughness of the composite material, further improve the mechanical properties of the composite material, and facilitate the expansion of the application range of the basalt fiber composite material.

The invention relates to the technical field of polymer composite materials, in particular to a cable polymer composite material for a wind turbine blade, which is prepared from the following raw materials in parts by weight: a polymer base material; a reinforcing material; a polymer modified material; a functional additive; a performance modifier; the functional additive is prepared from an anti-ultraviolet agent, an antioxidant, a silane coupling agent and nano titanium dioxide. According to the invention, the epoxy modified polyether-ether-ketone and bisphenol A epoxy resin compounded base material is matched with a continuous glass fiber, carbon fiber chopped strand and nano silicon nitride multi-element reinforcing system, so that the core short board of insufficient mechanical properties of the traditional material is thoroughly solved, and a magnesium hydroxide, aluminum hydroxide, expanded graphite and nano montmorillonite compounded flame-retardant system is also selected, so that the flame-retardant performance of the material is greatly improved. The flame-retardant cable material is high in flame retardance, free of toxic gas release, capable of meeting the environment-friendly requirement, capable of improving the material interface bonding force and long-term service reliability and capable of meeting the requirement for the service life of 20 years or above of wind power blade cables.

The invention discloses a polypropylene composite material with high dielectric constant, high strength and high modulus as well as a preparation method and application thereof, and belongs to the technical field of polymer composite materials. According to the composite material, homo-polypropylene is used as a matrix and matched with a high-dielectric-constant composite filler, a modified reinforcing filler and a functional additive, and through reasonable component design and process optimization, the dielectric property and the mechanical property are synergistically improved. Wherein the barium titanate-graphene with the core-shell structure is used as a high-dielectric-constant composite filler, and an efficient dielectric path can be constructed in a polypropylene matrix; the epoxy resin modified chopped glass fiber can significantly enhance the mechanical strength and modulus of the material; the maleic anhydride grafted polypropylene effectively improves the interfacial compatibility of the filler and the matrix. The dielectric constant (10GHz) of the prepared composite material is greater than or equal to 8, the tensile strength is greater than or equal to 60 MPa, and the bending modulus is greater than or equal to 4000 MPa. The composite material has excellent dielectric properties and mechanical properties, and can be widely applied to the fields of electronic appliances, high-frequency communication, new energy automobiles and the like.

The invention belongs to the technical field of polymer composite materials, and particularly relates to a preparation method of an aramid fiber / epoxy resin electronic-grade molding compound. The preparation method comprises the following steps: carrying out plasma treatment on aramid fibers, immersing the aramid fibers into a mixed solution of dopamine hydrochloride and a trihydroxymethyl aminomethane hydrochloride buffer solution for oscillation treatment, and then immersing the aramid fibers into an ethanol solution of a silane coupling agent to obtain modified aramid fibers; adding the modified aramid fiber and epoxy resin into a three-roller grinder for grinding and mixing to obtain pre-dispersed aramid fiber; uniformly stirring and mixing aluminum nitride, zinc oxide, epoxy resin and a silane coupling agent to obtain an epoxy resin prepolymer; stirring the pre-dispersed aramid fiber, an epoxy resin prepolymer, a curing agent, an anti-hydrolysis agent and a toughening agent, performing vacuum defoaming, and performing extrusion granulation to obtain the aramid fiber / epoxy resin electronic-grade molding compound. The composite material prepared by the method has the advantages of low moisture absorption, high thermal conductivity and favorable mechanical strength.

The invention belongs to the technical field of polymer composite materials, and discloses a super-strong heat-shielding fabric with a micro-nano composite structure, and a preparation method and application of the super-strong heat-shielding fabric. The core of the heat-shielding fabric is to construct a multifunctional integrated coating system through the synergistic effect of a slurry formula with specific components and an optimized coating and curing process, and particularly relates to a super-strong heat-shielding fabric used for tents, parasol, outdoor awnings and other products. The invention relates to a fabric, in particular to a fabric with excellent shading, heat shielding, anti-aging and high bonding fastness properties by constructing a micro-nano composite coating structure containing a specific functional filler on a base cloth. On the premise of ensuring excellent bonding fastness and long-term weather resistance between the coating and the flexible base cloth, efficient blocking of the full spectrum (especially near-infrared band) of the sun is realized, so that the super-strong heat-shielding fabric with high heat shielding rate, high physical durability and good processability is provided.

The invention discloses a low-odor regenerated polypropylene composite material as well as a preparation method and application thereof, and belongs to the technical field of polymer composite materials. Comprising the following raw materials in parts by mass: 10-78 parts of polypropylene, 10-50 parts of regenerated polypropylene, 0-20 parts of an inorganic filler, 2-15 parts of a toughening agent, 0.5-2 parts of an isocyanate coupling agent, 1-3 parts of an odor adsorbent, 0.1-0.5 part of an initiator and 0.5-2 parts of a processing aid. By adding an isocyanate coupling agent, in the extrusion granulation process, an isocyanate group (-NCO) and hydroxyl (-OH) or amino (-NH2) or carboxyl (-COOH)-containing micromolecules remaining in regenerated polypropylene or generated in the extrusion process are subjected to an addition reaction to form urea bonds or urethane bonds, and a plurality of micromolecules are cross-linked to form a macromolecular network; the small molecules with odor are captured, so that the content of emitted substances is reduced; in addition, small molecules are further adsorbed by cooperatively utilizing an odor adsorbent, and the low-emission regenerated polypropylene composite material is prepared.

A method and a device for generating recipes of a polymer composite material are provided which include acquiring a prediction recipe based on a preset target property of a target polymer composite material and a recipe prediction model; acquiring a result property of a polymer composite material generated based on the prediction recipe; calculating a difference value between the target property and the result property; and outputting or modifying the prediction recipe based on a result of comparing the difference value with a preset reference value.

The invention discloses a long glass fiber reinforced polypropylene resin composite material and a preparation method thereof, and belongs to the field of polymer composite materials. The composite material comprises the following raw materials in parts by weight: 50-70 parts of a polypropylene matrix, 20-40 parts of long glass fibers, 2-5 parts of a composite interface modifier, and maleic anhydride grafted polypropylene and an amino silane coupling agent which are compounded according to a weight ratio of 3: 1, and 0.5 to 2 parts of hydrophobic modified nano silicon dioxide. The composite material is prepared through the processes of glass fiber surface pretreatment, multi-component synergistic mixing and precise extrusion molding. According to the invention, through the chemical bonding effect of the composite interface modifier and the surface of the glass fiber, the interface bonding force between the glass fiber and a PP matrix is obviously improved, and meanwhile, the nanoscale damp-heat-resistant auxiliary agent is introduced to construct an anti-permeation barrier, so that the technical problems that the traditional long glass fiber reinforced PP composite material is poor in damp-heat resistance and large in mechanical property fluctuation are solved. After the prepared composite material is aged for 1000 hours in the environment of 85 DEG C / 85% RH, the impact strength loss rate is smaller than or equal to 10%, the tensile strength is larger than or equal to 85 MPa, and the composite material can be widely applied to the fields of automobile exterior trimming parts, household appliance wading parts and the like.

The invention discloses an interface thickness parameter acquisition method based on a microcosmic full-atom composite model, and belongs to the field of molecular simulation. The method comprises the following steps of: firstly, constructing a periodic model of a polymer A and a periodic model of a polymer B by utilizing MS software, and after the periodic models are combined, obtaining a global energy minimization total-atom composite model through geometric optimization and dynamic equilibrium optimization; finally, atomic concentration distribution data points of the full-atomic composite model are calculated in an MS software Perl script module through the secondary programming technology, an atomic concentration distribution curve is drawn, and smooth processing is conducted; setting a judgment benchmark of the interface thickness of the full-atom composite model, and judging whether the interface thickness exists in the full-atom composite model or not; and defining an interface thickness calculation formula of the full-atom composite model, and calculating the interface thickness of the full-atom composite model with the interface thickness, so as to quickly, efficiently, accurately and quantitatively calculate the thickness result of the interface layer of the polymer composite material. In addition, the method has the advantages of being convenient to operate and the like.

The invention belongs to the technical field of polymer composite materials, and particularly relates to a high-toughness hydrolysis-resistant polyurethane medical glove and a preparation method thereof. The glove is prepared from nanofiber reinforced waterborne polyurethane composite latex through dipping forming, the latex is prepared through a two-step process, chemical bonding of nanofiber and polyurethane is achieved, and the glove is ultrathin, high in toughness and excellent in hydrolysis resistance.

The invention belongs to the technical field of modified preparation of porous oil-containing materials, and provides a hierarchical porous oil-containing composite material as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing a polymer and a corresponding polymer covalent organic framework material, and sequentially carrying out cold pressing and hot sintering to obtain the hierarchical porous polymer composite material. And placing the hierarchical porous composite material in lubricating oil, and carrying out vacuum impregnation to obtain the hierarchical porous oil-containing composite material. The hierarchical porous oil-containing composite material prepared by the preparation method provided by the invention realizes self-adaptive oil supply within a wide rotating speed range and under different centrifugal forces, can meet the characteristics of maintenance-free property, high precision, high reliability, maintenance-free property and environmental friendliness of the material, and meets the upgrading of high-end equipment towards long service life and intelligence; and meanwhile, the balance of enhanced adsorption and high oil content (20%)-high oil retention rate (gt; 90%) of the lubricating oil is realized.

The invention relates to the field of polymer composite materials and functional films, and provides a cast film for a lithium ion battery, which is characterized in that the cast film is of a laminated composite structure, and the laminated composite structure comprises a support layer and an interface functional layer; the supporting layer comprises polymer fibers and boron nitride nanosheets which are dispersed in a three-dimensional network of the polymer fibers in a highly oriented manner; wherein the included angle between the plane normal direction of the boron nitride nanosheet and the thickness direction of the cast film is less than 30 degrees; the interface functional layer comprises a hyperbranched polymer matrix and LLZO nanowires which are distributed in the hyperbranched polymer matrix in a gradient manner; the surface, deviating from the supporting layer, of the interface functional layer is grafted with a zwitterionic polymer brush through chemical bonding; wherein the surface density of the LLZO nanowire is gradually reduced from the surface, grafted with the zwitterionic polymer brush, of the interface functional layer to the direction of an interface combined with the supporting layer; the cast film has good electrochemical performance, interface stability and safety performance.

The invention discloses a hydrogenated butadiene-acrylonitrile rubber composite material for cryogenic heat preservation and a preparation method thereof in the field of polymer composite materials, and the composite material is characterized in that zirconium-silicon composite modified hydroxyapatite and boron-nitrogen co-doped mesoporous alumina are introduced, so that the mechanical property and heat preservation effect of the material in a low-temperature environment are remarkably improved. The zirconium-silicon oxide network is constructed on the surface of hydroxyapatite by adopting a sol-gel method, and the doped mesoporous structure with the high specific surface area is obtained by adopting alkoxide as a precursor through hydrothermal treatment and calcination. When the rubber is mixed, the functional filler is dispersed at a high temperature, and then the plasticizer is added to ensure uniform distribution of the filler. The obtained composite material has excellent tensile strength, elongation at break and low heat conductivity coefficient at the liquid nitrogen temperature, and is suitable for the cryogenic thermal insulation fields of hydrogen energy storage and transportation, aerospace sealing and the like. All the raw materials are commercially available chemicals, the process is controllable, and industrial production is easy.

The application discloses a preparation method of a composite antioxidant and application thereof, and belongs to the field of high polymer materials. In the application, a ring octene and a silicon-containing cyclic olefin monomer are subjected to metathesis copolymerization under the action of a metathesis catalyst, a silicon-containing polymer is obtained after chemical hydrogenation, and then the composite antioxidant is obtained after hydrolysis and mixing with lignin. The main chain of the composite antioxidant is a saturated hydrocarbon chain, the compatibility with polyethylene is high, the silicon-containing polymer is hydrolyzed to generate active silanol, the active silanol is efficiently bonded with lignin, and the lignin provides natural polyphenol antioxidant function. The application realizes efficient antioxidant of the composite material, high compatibility and long-term durability, and provides a new idea for high-performance environment-friendly high polymer composite materials.

The application belongs to the technical field of polymer composites, and discloses a low linear expansion coefficient polyphenylene sulfide composite material, a preparation method and application thereof. The composite material comprises 20-60 parts of polyphenylene sulfide resin, 40-80 parts of a low expansion filler system, 0.5-5 parts of a coupling agent, 0.1-1 part of a lubricant and 0.1-1 part of a toning agent. The low expansion filler system is at least two of a lamellar structure filler, a fibrous structure filler and a nano-sized filler. The polyphenylene sulfide composite material obtained has a low linear expansion coefficient while maintaining good mechanical properties through the limiting effect of the lamellar structure filler on the thermal expansion of the resin matrix, the reinforcing effect of the fibrous structure filler on the strength and modulus of the material and the improvement effect of the nano-sized filler on the filling structure and the interface state. The polyphenylene sulfide composite material can be applied to the fields of precision instruments, electronic packaging, electronics and electrical appliances, automobiles and aerospace, etc. which have high requirements for thermal dimensional stability.

The invention belongs to the technical field of polymer composite materials, and discloses a leather collagen fiber / polyurethane composite material and a preparation method thereof. The metal-polyphenol coordination network interface layer provided by the invention is accurately positioned on the surface of the leather collagen fiber and is between the fiber and a waterborne polyurethane matrix, and a three-stage structure of'fiber-interface layer-matrix 'is constructed. The interface layer forms a stable network through coordination of metal nanoparticles and polyphenol, and forms chemical bridging with a WPU matrix through secondary bonding. According to the structure, the tearing strength and the tensile capacity of the composite material are greatly improved, the limitation that reinforcement and toughening are difficult to consider in traditional physical blending modification is broken through, and a synergistic reinforcement effect is generated.