34results about How to "Improve processing fluidity" patented technology

The invention relates to the technical field of high-performance polymer materials, in particular to low-dielectric and high-temperature-resistant modified cyanate ester resin and a preparation method thereof. Advantages and characteristics of bisphenol A type cyanate ester monomers and bisphenol M type cyanate ester monomers are combined, and the dielectric property and the thermal stability are remarkably improved. Diallyl bisphenol A is introduced as a network structure modifier, the phenolic hydroxyl group of the diallyl bisphenol A adjusts the curing reaction rate, and the allyl and bisphenol A structures of the diallyl bisphenol A finely regulate and control the rigid-flexible balance of a cross-linked network through chemical copolymerization, so that the curing process is controllable and the final network structure is optimized. Meanwhile, a toughening system is innovatively designed, epoxy-terminated liquid nitrile rubber is adopted for toughening, stable micron-scale rubber particles are formed in a resin matrix in a chemical bonding mode, and the fracture toughness is improved. The modified resin has excellent dielectric properties, high heat resistance and a wide process window, and meets the strict requirements of a new generation of low observability aircrafts on a bearing-stealth integrated composite material matrix.

The invention discloses natural cereal and coarse cereal composite nutritional flour and a preparation method thereof, and relates to the technical field of flour preparation, the natural cereal and coarse cereal composite nutritional flour comprises the following raw materials: wheat flour, modified oat flour, modified corn flour, auxiliary coarse cereal flour and silicon dioxide; according to the invention, the modified oat flour is added, and through triple synergistic modification, the solubility and bioavailability of beta-glucan in oat are greatly improved, the water binding capacity and thermal stability of the composite flour are also enhanced, starch retrogradation is effectively inhibited, and the shelf life of a finished product is prolonged; pure physical modification does not have chemical residues, so that the composite flour is suitable for special crowds with diabetes, celiac disease and the like, and the defect that common coarse cereal composite flour is insufficient in functionality is overcome; the modified corn flour is added, the problems that common corn flour is low in dietary fiber solubility and poor in dough stability can be solved, a compact network is formed through synergy of natural polysaccharides, the water holding capacity and processing fluidity of the composite flour are improved, and water loss and caking in the cooking or baking process are reduced.

The invention provides a low-water-absorption glass bead modified PBT (polybutylene terephthalate) material and a preparation method thereof. The low-water-absorption glass bead modified PBT material comprises the following components in parts by weight: 70-100 parts of PBT resin; 0 to 30 parts of solid glass beads; 0-5 parts of a toughening agent; 0-2 parts of an antioxidant; 0-2 parts of a lubricant; 0-2 parts of black color master batch; 0-2 parts of a coupling agent; 0-5 parts of polytetrafluoroethylene wax; wherein the average particle size of the solid glass beads is 1-50 [mu] m; the average particle size of the polytetrafluoroethylene wax is 3-15 [mu] m, and the weight-average molecular weight of the polytetrafluoroethylene wax is 10000-30000 g / mol; the weight ratio of the solid glass beads to the polytetrafluoroethylene wax is (5-10): 1. According to the invention, the polytetrafluoroethylene wax is added into the solid glass bead modified PBT material, so that the shrinkage difference between the material flow direction and the vertical flow direction is effectively reduced, the water absorption rate of the material is remarkably reduced, the preparation process is simple, and the production process is easy to control.

The invention relates to the technical field of automobile parts, and particularly discloses an anti-oxidation corrosion-resistant automobile air-inlet grille and an electroplating process thereof.The anti-oxidation corrosion-resistant automobile air-inlet grille is prepared from phenoxy-terminated siloxane modified polycarbonate, ABS resin, a modified LDHs antioxidant, a compatilizer ABS-g-MAH and a lubricant ethylene bis stearamide through melt blending, extrusion granulation and injection molding. And a copper layer, a nickel-phosphorus layer and a cobalt-chromium layer are further electroplated and deposited on the automobile air-inlet grille, and the anti-oxidation and corrosion-resistant automobile air-inlet grille is formed.

The invention discloses a high-transparency TPU (thermoplastic polyurethane) hot melt adhesive film composition and a production process thereof, and belongs to the technical field of high polymer materials. The composition comprises a TPU matrix, a polymer modifier and the like. The production process comprises the following steps: synthesis of a four-arm star-shaped polymer modifier, vacuum dehydration of raw materials, high-speed mixing, gradient temperature control extrusion granulation, and gradient melting-rapid cooling curtain coating film formation under nitrogen protection. In order to overcome the defects that an existing TPU hot melt adhesive film is insufficient in transparency, poor in bonding durability and prone to migration of a modifier, star topology modifier design and a dual covalent cross-linking synergistic scheme are provided, molecular-level compatibility of the modifier and TPU is achieved, and finally the hot melt adhesive film high in transparency, high in bonding stability and excellent in processing performance is obtained. The method is suitable for high-end scenes such as optical device fitting.

The invention belongs to the technical field of road and bridge paving materials, and discloses an anti-rutting epoxy asphalt toughening additive. The formula comprises the following components in parts by weight: 40 parts of solid epoxy resin, 35 parts of a latent polyester curing agent, 5 parts of an ultra-high molecular weight epoxy toughening agent, 20 parts of a water damage resistant improver, 100 parts of hard asphalt particles, 2 parts of an antioxidant, 5.5 parts of a silane coupling agent, 6 parts of nano silicon dioxide, 0.1 part of a curing accelerator, 0.5 part of a light stabilizer and 1 part of a lubricating separant. In the formula, solid epoxy reacts with a latent polyester curing agent to form a three-dimensional rigid structure, and the three-dimensional rigid structure is matched with oxidized asphalt particles and nano silicon dioxide, so that the high-temperature stability and the pressure resistance are remarkably improved, and ruts are inhibited from the source; the ultra-high molecular weight epoxy flexibilizer can prolong the molecular chain segment of a cross-linking point, and is combined with the curing accelerator to regulate and control the reaction rate, so that the low-temperature crack resistance and fatigue resistance are enhanced while the strength is ensured.

This invention provides a flame-retardant, high-transmittance, and weather-resistant composite material for LED lampshades and its preparation method. By weight, the raw materials include: 80-95 parts bisphenol A type polycarbonate, 4-10 parts phenyl-containing polysiloxane microspheres, 1-4 parts mesoporous silica phosphorus-loaded microspheres, 0.3-0.8 parts silane coupling agent, 0.3-0.8 parts flame retardant, 2-5 parts organic nano-montmorillonite, 0.2-0.6 parts polycarbodiimide, 0.3-0.8 parts antioxidant, 0.3-0.7 parts light stabilizer, and 0.3-1.0 parts lubricant. The flame-retardant, high-transmittance, and weather-resistant composite material for LED lampshades provided by this invention possesses comprehensive properties of high light transmittance, high toughness, and heat resistance.

This invention relates to a biodegradable anti-stick film and its preparation method. The biodegradable anti-stick film comprises a top layer, a middle layer, and a bottom layer arranged sequentially. The top layer comprises polyadipate, polylactic acid, polybutylene butyrate, a compatibilizer, a chain extender, and a dual-antibiotic masterbatch. The middle layer comprises polyadipate, polyglycolic acid, polybutylene butyrate, a compatibilizer, a chain extender, and a dual-antibiotic masterbatch. The bottom layer comprises polyadipate, polylactic acid, polybutylene butyrate, a compatibilizer, a chain extender, and a dual-antibiotic masterbatch. Its advantages lie in the following: adding a compatibilizer to each layer improves the compatibility of the raw materials, thereby reducing the brittleness of the biodegradable anti-stick film; adding PBAT-carrier dual-antibiotic masterbatch to each layer controls the degradation rate of the biodegradable anti-stick film; adjusting the blending ratio of each layer component improves the mechanical properties, processing flowability, and biodegradability of the biodegradable anti-stick film; and coating the top layer with a UV-curable release coating ensures the application requirements of the biodegradable anti-stick film.

This invention relates to the field of polymer materials technology, and discloses a high-elasticity rubber-plastic insulated cable composite material and its preparation method. The high-elasticity rubber-plastic insulation material comprises, by weight, 40-50 parts of EPDM rubber, 20-25 parts of polyolefin elastomer, 30-35 parts of modified calcined kaolin, 3-5 parts of composite antioxidant, 2-3 parts of silane coupling agent, and 1.5-2 parts of vulcanizing agent. During preparation, EPDM rubber and polyolefin elastomer are kneaded for 5-8 minutes, then modified calcined kaolin and silane coupling agent are added and kneaded for another 8-12 minutes, followed by the addition of composite antioxidant and vulcanizing agent and kneading for 3-5 minutes. Finally, the mixture is vulcanized in stages. The first stage vulcanization temperature is 155-160℃, and the second stage vulcanization temperature is 165-170℃. The insulating material prepared by this invention has excellent elasticity, outstanding resistance to flexural fatigue, stable insulation performance, high volume resistivity, excellent aging resistance, and tight interfacial bonding. It is suitable for use in high-voltage cable insulation layers, effectively extending the service life and stability of the cable.

The invention discloses a preparation method of a toughened cellulose / polylactic acid composite material, and belongs to the technical field of polylactic acid toughening, and a toughening agent comprises polylactic acid, maleic anhydride, polyurethane and a bio-based plasticizer. According to the invention, maleic anhydride grafted polylactic acid is used as a composite material flexibilizer main body, a polyurethane polylactic acid block polymer is used as a composite material auxiliary flexibilizer, the flexibility of the composite material is increased through a bio-based plasticizer, and the ductility and processing fluidity of the composite material are improved; therefore, the flexibilizer can be in full contact with cellulose and polylactic acid in the melt blending process, and the toughening effect is improved. The compatibility of cellulose and polylactic acid in the prepared composite material is greatly improved, the problems that the cellulose / polylactic acid composite material is insufficient in toughness and ductility are solved, and the method is simple in preparation process, low in cost and wide in application prospect.

The invention discloses thermoplastic polyamide as well as a preparation method and application thereof, and the preparation method comprises the following steps: mixing a carboxyl monomer, a hydroxyl monomer, 3, 6-dioxa-1, 8-octane dithiol, a catalyst and a solvent, carrying out sulfydryl-olefin click reaction under the protection of inert gas, and carrying out post-treatment to obtain the thermoplastic polyamide, wherein the structural formula of the carboxyl monomer is shown in the specification, and the structural formula of the hydroxyl monomer is shown in the specification; the mass ratio of the carboxyl monomer to the hydroxyl monomer to the 3, 6-dioxa-1, 8-octane dithiol is (9.7 to 14.2) to (1.3 to 5.2) to 5.5. The invention provides high molecular weight bio-based functional polyamide prepared through mercapto click polymerization, the polyamide has reactive side groups including carboxyl and hydroxyl, so that new chemical covalent bonds are formed in the high-temperature processing process, a polymer network is converted from a linear type to a cross-linked type, and further the cementing performance is enhanced.

This invention discloses an organo-bentonite flame retardant synergist and its preparation method, belonging to the field of flame retardant materials technology. The preparation method includes: preparing calcium-based bentonite into a slurry, adding sodium carbonate for sodium purification; subjecting the purified slurry to high-pressure homogenization and flake removal; adding an organic modifier composed of octadecyl quaternary ammonium salt and dioctadecyl quaternary ammonium salt to the flaked slurry for intercalation modification, drying and dispersing; and adding end-functionalized polysiloxane to the organo-bentonite powder for surface coating treatment, thus obtaining the final product. The organo-bentonite flame retardant synergist prepared by this invention has a nanoscale layered structure and excellent compatibility with polyolefin matrices. When this synergist is combined with aluminum hydroxide for use in polyolefin composites, it can reduce processing torque, increase tensile strength, improve the limiting oxygen index to achieve UL-94V-0 rating, and simultaneously promote the formation of a continuous and dense expanded char layer, effectively inhibiting dripping.

This invention relates to the field of cable material technology, and in particular to an antimicrobial adhesion underwater cable sheath material and its preparation and modification process. It comprises the following components in parts by weight: 60-65 parts LLDPE; 10-15 parts PP; 8-12 parts PVDF; 8-12 parts EVA; 0.3-0.5 parts mixed antioxidant; and 0.1-0.3 parts mixed lubricant. This invention utilizes a quaternary blend system of LLDPE, PP, low molecular weight PVDF, and EVA, combined with a highly efficient antioxidant and lubricant, to give the sheath material excellent water resistance, aging resistance, and antimicrobial adhesion properties. After activation by 360° annular plasma under constant pressure, a hydrophilic hydration layer of HEMA and NVP is grafted onto the sheath surface, which effectively inhibits microbial adhesion and biofilm formation, significantly extending the service life of underwater cables.

The invention discloses sec-ethyl phosphate as well as a preparation method and application thereof, and belongs to the technical field of synthesis of flame retardants. Tri (2-ethoxyl) isocyanurate, phosphorus oxychloride and an alcohol compound are used as raw materials, the cyan phosphate is prepared through three-step reaction of preparing phosphoryl chloride diester, refining the phosphoryl chloride diester and synthesizing the cyan phosphate, the molecular structure contains a phosphate group and a triazine ring conjugated structure, and a carbon source, a gas source and an acid source are integrated. The thermal decomposition temperature of the sec phosphate is greater than or equal to 320 DEG C, the UL94V-0 level flame retardant standard can be reached by adding 12%-15% of sec phosphate into a high polymer material, and the sec phosphate has the characteristics of high flame retardant efficiency, good compatibility, strong migration resistance, excellent thermal stability, environmental protection and low toxicity; the synthetic preparation method is stable in process, easy in condition control and high in product purity, can be widely applied to flame-retardant modification of high polymer materials such as polyvinyl chloride, polyurethane and epoxy resin, and has important industrial application value.

The invention belongs to the technical field of electric power engineering, and particularly relates to a composite layer material for a cable intermediate joint and a preparation method of the composite layer material. The composite layer material for the cable intermediate joint is composed of an inner semi-conductive layer, an insulating layer and an outer semi-conductive layer, the silicone rubber is prepared from the following raw materials: methyl vinyl silicone rubber, methyl phenyl vinyl silicone rubber, trifluoropropyl methyl vinyl silicone rubber, a vulcanizing agent, an assistant crosslinker, an accelerant, diphenyl silanediol, an anti-aging agent, trifluoropropyl cage type silsesquioxane, and a mixture of modified nano hydroxyapatite and nano hectorite. According to the composite layer material for the cable intermediate joint, the three layers adopt the consistent siloxane main chain structure and vulcanization system, interlayer chemical compatibility is ensured, synchronous co-crosslinking is achieved, and by adjusting the silicone rubber composition and proportion of all the layers, the composite layer material can be applied to the cable intermediate joint. And it is ensured that the prepared composite layer material for the cable intermediate joint has excellent mechanical and hydrophobic water-blocking performance.

The invention discloses a preparation method of an oligomeric silsesquioxane material modified moisture-curable polyurethane hot melt adhesive, and relates to the technical field of adhesives. The hot melt adhesive is prepared from the following raw materials in parts by weight: 10 to 30 parts of polyether polyol, 20 to 40 parts of polyester polyol, 10 to 20 parts of methacrylate copolymer resin, 1 to 5 parts of color paste, 5 to 15 parts of heptaisobutyltrisilanol-polyhedral oligomeric silsesquioxane, 15 to 25 parts of diphenylmethane diisocyanate and 0.1 to 0.5 part of a catalyst, the preparation process comprises the steps of vacuum dehydration of raw materials, secondary dehydration after addition of TPOSS, MDI reaction, addition of a catalyst, stirring, discharging and the like. The glass transition temperature, the high temperature resistance, the aging resistance and the corrosion resistance of the polyurethane hot melt adhesive are remarkably improved, meanwhile, the good body mechanical property and the bonding strength to different base materials are kept, and the polyurethane hot melt adhesive can be widely applied to bonding of key components in the consumer electronics industry, the intelligent wearing industry and the automotive electronics industry.

The application discloses a preparation method and application of ethylene-vinyl acetate copolymer with dynamically regulated molecular weight and distribution, and relates to the technical field of ethylene-vinyl acetate copolymer. According to the chain transfer constant, the solvent is divided into three categories through a solvent classification and selection strategy, high and low activity initiators are matched, and different EVA is prepared through dynamic regulation of the adding time of the multi-phase solvent and monomer gradient feeding in three processes, so that the GPC peak type, molecular weight and distribution of the EVA are accurately regulated. The selection of the solvent is changed from a passive reaction medium role to an active 'performance regulator', the performance of the EVA can be systematically optimized, and the performance of customized EVOH material is realized.

This invention discloses an anti-torsion robot cable, belonging to the field of cable technology. It comprises, from the inside out, a cable core, an insulation layer, and an outer sheath layer. The outer sheath layer is made of the following materials in parts by weight: 80-100 parts polyvinyl chloride, 20-25 parts multifunctional additives, 2-3 parts calcium / zinc composite stabilizer, 1-2 parts lubricant, and 0.5-0.8 parts antioxidant. The anti-torsion robot cable provided by this invention incorporates multifunctional additives in its outer sheath layer, based on the molecular design principle of phosphorus-nitrogen synergistic flame retardancy and lactic acid ester group high-efficiency plasticization, which can significantly improve the overall performance of the cable from multiple dimensions.

The application belongs to the technical field of electric power engineering, and particularly relates to a composite layer material for cable intermediate joint and a preparation method thereof. The composite layer material for cable intermediate joint is composed of an inner semi-conductive layer, an insulating layer and an outer semi-conductive layer. The insulating layer is composed of the following raw materials: methyl vinyl silicone rubber, methyl phenyl vinyl silicone rubber, trifluoro propyl methyl vinyl silicone rubber, vulcanizing agent, auxiliary cross-linking agent, accelerator, diphenyl silicone diol, anti-aging agent, trifluoro propyl cage type silsesquioxane, and a mixture of modified nano-hydroxyapatite and nano-laponite. The composite layer material for cable intermediate joint has a consistent siloxane main chain structure and vulcanization system in three layers, which ensures the chemical compatibility between layers and realizes synchronous co-crosslinking. By adjusting the composition and ratio of silicone rubber in each layer, the prepared composite layer material for cable intermediate joint has excellent mechanical and hydrophobic water-blocking properties.

This invention relates to the field of polyurethane adhesive technology, specifically to a thermoplastic polyurethane resin for bonding water-repellent fabrics, its preparation method, and its application. It is prepared from the following raw materials: polyol, isocyanate, blocked isocyanate, chain extender, bonding accelerator, water-repellent synergist, and catalyst; the bonding accelerator is a compound of γ-aminopropyltriethoxysilane and tetrabutyl titanate; the water-repellent synergist is epoxy-terminated polydimethylsiloxane. This invention, through optimized formulation, solves the technical problems of insufficient bonding strength and poor resistance to damp heat aging of existing polyurethane resins for water-repellent fabrics, while also considering the synergistic effect of resin processing fluidity and water-repellent performance. It is suitable for composite processing of water-repellent fabrics in high-frequency use scenarios and has broad industrial application prospects.

This invention discloses an enhanced antistatic polyetheretherketone (PEEK) composite material and its preparation method. The composite material is prepared from the following raw materials in parts by weight: 60-85 parts of PEEK resin, 5-15 parts of a first synergistic component, 3-10 parts of a second synergistic component, 2-8 parts of a third synergistic component, and 1-5 parts of a high-temperature processing aid. The first synergistic component is a mixture of a metal-based conductive filler and a high-temperature resistant antistatic synergist; the second synergistic component is ionic liquid-functionalized modified graphene; the third synergistic component is a composite of carbon nanotubes and conductive nanofibers; and the high-temperature processing aid includes a high-temperature lubricant and a high-temperature antioxidant. The preparation method includes steps such as preparing various premixes, melt blending, extrusion granulation, and supercritical fluid in-mold foaming. This invention constructs a stable three-dimensional conductive network through the synergistic effect of multi-scale conductive fillers, giving the composite material excellent antistatic properties.

The application discloses a low-heat-release, low-smoke-density flame-retardant polyamide material and a preparation method and application thereof, and belongs to the technical field of high polymer materials. The material comprises nylon resin 52-61%, a flame retardant 18-26%, a flame-retardant synergist 6-10%, a plasticizer 8-15%, a coupling agent 0.5-1.0%, an antioxidant 0.3-1.0% and a lubricant 0.3-1.0%, and is prepared through mixing, melt mixing, extrusion and granulation. The application effectively reduces the heat release and the smoke density of the polyamide material during combustion through the synergistic effect of the components such as the flame retardant, and meanwhile, good mechanical properties and processing stability are maintained, thereby meeting the demand of high-safety-grade application scenarios.

The invention relates to a fluoride-free flame-retardant polyphenyl ether resin composition as well as a preparation method and application thereof, and belongs to the technical field of high polymer materials. The resin composition comprises the following raw material components in parts by weight: 67-80 parts of polyphenyl ether resin; 3 to 10 parts of HIPS (High Impact Polystyrene) resin; 10 to 16 parts of a phosphate ester flame retardant; 3 to 8 parts of cross-linked styrene toughening master batch; 1-3 parts of an inorganic nano flame retardant; 0.2 to 0.5 part of an antioxidant; 0.1 to 0.5 part of a light stabilizer; and 0.5 to 1.0 part of a lubricant. Compared with the prior art, the fluoride-free flame-retardant polyphenyl ether resin composition disclosed by the invention solves the problems that the conventional flame-retardant polyphenyl ether resin needs an anti-dripping agent PTFE for synergistic flame retardance but cannot meet the PFAS prohibition, and the fluoride-free flame-retardant polyphenyl ether scheme adopting phosphonitrile for flame retardance needs high cost, and has a wide application prospect.

The invention relates to the technical field of films, in particular to a flame-retardant polypropylene film and a preparation method thereof.The flame-retardant polypropylene film is prepared from, by weight, 65-75 parts of polypropylene, 13-18 parts of a flame-retardant composition, 9-11 parts of hyperbranched polypropylene, 0.4-0.8 part of a lubricant and 0.8-1.2 parts of an antioxidant; the flame-retardant composition comprises a flame retardant and a charring agent, wherein the flame retardant comprises microencapsulated ammonium polyphosphate, zinc stannate and graphene oxide. In order to improve the problem of poor flame retardancy of the polypropylene packaging material, the flame retardancy of the polypropylene film is improved while the strength of the polypropylene film is maintained, so that the polypropylene film has more excellent mechanical properties and flame retardancy.

This invention relates to the field of modification of water-based photovoltaic materials, providing an HDPE material with improved resistance to environmental stress cracking and its preparation method. By scientifically controlling the types, ratios, and processing techniques of nano-rigid particles, antioxidants, and elastomers, a synergistic effect of "toughening-reinforcing-anti-aging" is achieved, significantly improving the environmental stress cracking resistance of HDPE materials while maintaining good rigidity, processing fluidity, and long-term service stability, thus expanding its application range in high-end weather-resistant and corrosion-resistant scenarios.

The application relates to the technical field of high polymer materials, and particularly discloses a bio-based polyether ether ketone as well as a preparation method and application thereof. The bio-based polyether ether ketone is prepared by the following steps: mixing a bio-based diphenol monomer, alkali, 4,4'-difluorobenzophenone, a water-carrying agent and a polar organic solvent, refluxing the water-carrying agent at 30-150 DEG C, evaporating the water-carrying agent at 40-150 DEG C, performing a final polymerization reaction at 150-260 DEG C, and then sequentially performing precipitation, washing and drying to obtain the bio-based polyether ether ketone. The bio-based polyether ether ketone provided by the application uses renewable biomass as a raw material to construct a core molecular structure, retains the core properties of traditional polyether ether ketone, such as high-temperature resistance and chemical corrosion resistance, and optimizes and improves the solubility and processing fluidity.

The invention provides a sound-absorbing and noise-reducing material for vehicles and a preparation method of the sound-absorbing and noise-reducing material. The sound absorption and noise reduction material for the vehicle comprises a structural sound insulation layer and a damping vibration absorption layer which are arranged in a stacked mode. The structural sound insulation layer comprises the following raw materials in parts by mass: 55 parts of thermoplastic vulcanized elastomer; 10-15 parts of sodium stearate surface modified calcium carbonate micro powder; 20 to 25 parts of chitosan-chitosan oligosaccharide composite micro powder; 1.5 to 1.8 parts of polyethylene glycol; 1.2 to 1.8 parts of an antioxidant 1010; 1.2 to 1.8 parts of an antioxidant 168; the damping vibration absorption layer comprises the following raw materials in parts by mass: 58 parts of polyamide 66; 13 to 14 parts of POE (Polyolefin Elastomer)-g-MAH 7-9 parts of epoxidized lignin; 4-6 parts of ethylene propylene diene monomer; 10-15 parts of sodium stearate surface modified calcium carbonate micro powder; 1-3 parts of polyethylene glycol; 0.1 to 0.2 part of zinc oxide; 0.5 to 0.8 part of an antioxidant 1010; and 0.2 to 0.5 part of an antioxidant 168. The sound-absorbing and noise-reducing material for the vehicle has excellent sound-insulating and noise-reducing performance within the frequency range of 200-2000Hz, and is suitable for engine compartment sound-insulating pads, floor assemblies and vehicle door inner plates of vehicles.

This invention relates to the field of medical materials technology, and discloses a biodegradable esophageal stent and its preparation method. The esophageal stent is woven from blended monofilaments. The raw materials for the blended monofilaments include polylactic acid, polycaprolactone, and additives, including polyethylene glycol, carbon nanofibers, star-shaped PLA-PCL block copolymer, and talc. The preparation steps are as follows: the raw materials are mixed in proportion, melt-blended and granulated, and then the blended monofilaments are obtained using a high-pressure capillary rheometer; the blended monofilaments are woven into a mesh-like stent framework on a mold using an interlaced pressing method, then heat-set, and demolded after cooling; a thermoplastic polyurethane casting liquid loaded with bioactive substances is cast into a film and coated onto the inner wall of the stent framework; the thermoplastic polyurethane film is heated to fuse with the stent framework, and after cooling, the esophageal stent is formed. The esophageal stent of this invention has good mechanical properties, controllable degradation characteristics, and biocompatibility.

The invention relates to the technical field of bio-based high polymer material modification and adhesive preparation, and discloses an environment-friendly flat adhesive for wooden furniture and a preparation method of the environment-friendly flat adhesive. The flat adhesive is prepared from the following raw materials in parts by weight: 50 to 60 parts of starch, 1.5 to 2.5 parts of succinic anhydride, 1 to 1.5 parts of octenyl succinic anhydride, 15 to 20 parts of maleic anhydride grafted polylactic acid, 3 to 8 parts of modified lignin, 10 to 15 parts of isosorbide, 3 to 6 parts of bio-based wax and 0.2 to 20.7 parts of auxiliaries. The starch is endowed with excellent comprehensive performance through double modification of succinic anhydride and octenyl succinic anhydride. Succinic anhydride introduces polar carboxyl through efficient ring-opening reaction, so that the chemical bonding force between an adhesive layer and wood fibers is remarkably enhanced, and the peel strength is greatly improved; and a long-chain hydrophobic structure of octenyl succinic anhydride improves the compatibility and processing fluidity of starch and a polymer, and further macroscopically strengthens the water resistance of an adhesive layer, so that the finished product meets the performance requirements of the wood furniture flat adhesive on the premise of maintaining the environment-friendly advantages of full bio-based, zero odor and zero residue.

The invention relates to a nucleating agent master batch as well as a preparation method and application thereof. The preparation method comprises a mechanical activation process of the nucleating agent, an ultrathin film coating process and a pre-dispersion process of blending with the polymer, and the method can effectively avoid the physical agglomeration problem of the nucleating agent, so that the nucleating agent is efficiently dispersed in the resin. The invention also provides a method for preparing the special material for the low-haze LLDPE film from the nucleating agent master batch. The special material for the film comprises the following components in parts by mass: 90-95 parts of LLDPE resin; 0.05 to 0.15 part of an antioxidant; 0.01 to 0.05 part of an antistatic agent; 0.01 to 0.05 part of an acid acceptor; 0.1 to 0.5 part of a processing aid; the thin film prepared from the special material has the characteristic of low haze.