624 results about "Extrusion Granulation" patented technology

The invention discloses a biodegradable polylactic acid composite material and a preparation method thereof, and relates to the technical field of polylactic acid materials. The method comprises the steps that firstly, chitosan activated through hydrochloric acid is subjected to graft modification through a KH550 silane coupling agent, meanwhile, nano-zinc oxide is subjected to surface modification through stearic acid, the chitosan and the nano-zinc oxide are mixed, spray drying is conducted, and antibacterial composite powder is prepared; the preparation method comprises the following steps: performing hydrochloric acid activation and KH570 silane coupling agent modification on nano silicon dioxide, performing hydroxypropylation modification on alkali lignin, and performing reflux crosslinking reaction on the modified alkali lignin, KH570 modified nano silicon dioxide, polycaprolactone, methyl methacrylate and azodiisobutyronitrile to prepare a heat-resistant reinforcer; uniformly mixing polylactic acid, poly (butylene succinate), the antibacterial composite powder, the heat-resistant reinforcer, tributyl citrate, polyethylene glycol and talcum powder, and extruding and granulating by using a twin-screw extruder to obtain the heat-resistant antibacterial material. The composite material prepared by the invention has excellent antibacterial property, heat resistance and biodegradability.

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 discloses a preparation method of a nano silicon dioxide modified high-density polyethylene wear-resistant plate, and belongs to the technical field of polyethylene plates, the method comprises the following steps: firstly preparing an antioxidant PMMA microcapsule, then preparing titanium dioxide and silicon dioxide, and modifying by KH550 to obtain modified nano titanium-silicon composite particles; then, an antioxidant coated PMMA microcapsule, the modified nano titanium-silicon composite particles, POE-g-MAH and HDPE particles are premixed, and the wear-resistant plate is obtained through twin-screw extrusion granulation and pulsating force field assisted molding; through the synergistic effect of the antioxidant coated PMMA microcapsule, the modified nano titanium-silicon composite particles and the compatilizer POE-g-MAH, the problems that the wear resistance of the HDPE plate is insufficient and the antioxidant is easily adsorbed by nano silicon dioxide to cause aging resistance attenuation are solved, and the wear resistance, thermal oxidation / light aging resistance and mechanical property improvement of the plate are realized; and the requirements of high-frequency wear scenes such as mine conveying and outdoor engineering can be met.

The invention belongs to the technical field of high polymer materials, and particularly relates to a PET decorative film and a preparation method thereof. The preparation method comprises the following steps: synthesizing hydroxyl-terminated hyperbranched polyester by taking pentaerythritol and 2, 2-dimethylolpropionic acid as raw materials, and reacting with polyol glycidyl ether to prepare an epoxy-terminated organic modifier; silver-loaded nano silicon dioxide subjected to surface treatment by an amino silane coupling agent is used as inorganic functional particles; pET resin, an organic modifier and inorganic functional particles are subjected to melt blending and extrusion granulation, and modified PET is prepared; the modified PET is prepared into the film through a two-way stretching process. Epoxy groups of the organic modifier chemically react with amino groups at the tail end of a PET molecular chain and on the surfaces of inorganic particles respectively, a stable organic-inorganic hybrid network is constructed, synergistic improvement of reinforcement, toughening and long-acting antibiosis is achieved, and the technical problems that functional particles are not uniform in dispersion, interface bonding is weak, and antibacterial components are prone to migration are effectively solved.

The utility model discloses a polypropylene multi-unit collaborative devolatilization system, which belongs to the technical field of devolatilization in polypropylene production process, and comprises a polypropylene powder solid-phase devolatilization unit, a polypropylene powder solid-phase devolatilization unit, a polypropylene powder solid-phase devolatilization unit, a polypropylene powder solid-phase devolatilization unit and a polypropylene powder solid-phase devolatilization unit, the extrusion granulation devolatilization unit comprises an extruder and a granulator, an outlet of the powder collecting tank is connected with a feed port of the extruder, and an outlet of the extruder is connected with the granulator; the granule devolatilization unit comprises a hot air drying stock bin, and an outlet of the granulator is connected with an inlet of the hot air drying stock bin; an outlet of the hot air drying bin is used for being connected with a packaging production line. According to the melt devolatilization system disclosed by the utility model, the batch-type vacuum dryer is additionally arranged, so that the modification of a core equipment double-screw extruder is reduced, the process complexity of the melt devolatilization system is obviously reduced, the devolatilization efficiency is improved, and volatile components can be completely removed.

The invention discloses anti-shrinkage directional conductive supercritical foaming rubber and a preparation method thereof, and relates to the technical field of conductive rubber foam, raw materials comprise a rubber matrix, a modified fiber forming polymer and an auxiliary agent system, and the modified fiber forming polymer is prepared from a fiber forming polymer and a conductive filler. The preparation method comprises the following steps: extruding and granulating the fiber-forming polymer and the conductive filler to obtain modified granules, blending the modified fiber-forming polymer granules and the rubber matrix, carrying out extrusion and traction processes to obtain an in-situ fiber-forming modified rubber material, carrying out directional open milling, adding an auxiliary agent system, carrying out vulcanization molding, and foaming in a supercritical fluid to obtain the rubber foam material. The directional conductive fiber is constructed in the rubber matrix in situ, the rubber foaming material with directional conductivity and shrinkage resistance is prepared, the conductive efficiency is high, the problem that a rubber supercritical foaming material is prone to shrinkage is solved, and the rubber foaming material has the characteristics of heat insulation, light weight, high strength and the like and can be used for buffering and damping, heat insulation, electromagnetic shielding, flexible sensing and other scenes.

The invention relates to the technical field of foaming materials, in particular to a shoe material preparation process for finished shoes based on supercritical physical foaming and the finished shoes. The preparation method comprises the following steps: 1) weighing a matrix, octadecyl polyhedral oligomeric silsesquioxane, an active group-containing styrene-acrylonitrile copolymer, a polydimethylsiloxane block copolymer, an epoxy functional group-containing olefin copolymer, a nano silicon dioxide dispersion and a processing aid, uniformly mixing, blending, extruding, granulating and drying to obtain a blended material, wherein the matrix, the octadecyl polyhedral oligomeric silsesquioxane, the active group-containing styrene-acrylonitrile copolymer, the polydimethylsiloxane block copolymer, the epoxy functional group-containing olefin copolymer, the nano silicon dioxide dispersion and the processing aid are mixed uniformly; the preparation method comprises the following steps of (1) preparing a polymer, (2) plasticizing the blended material to form a preformed blank, injecting supercritical gas, and fully dissolving the supercritical fluid in the polymer at the temperature of 150-180 DEG C and the pressure of 10-20MPa for 1-3 hours, (3) reducing the pressure to normal pressure within 10 seconds at the pressure reduction rate of less than or equal to 2MPa / s, and (4) cooling and shaping at the temperature of 60-80 DEG C to obtain the shoe material.

The invention discloses a high-temperature-resistant flame-retardant wire harness and a preparation method thereof, and relates to the technical field of electric harnesses. The method comprises the following steps: firstly, introducing phosphorus and silicon flame-retardant elements on a polyethylene molecular chain through plasma activation and free radical grafting reaction to prepare phosphorus-silicon grafted modified polyethylene, then compounding aminated silicon dioxide and organic intercalated montmorillonite by using isophorone diisocyanate as a bridging agent to prepare the phosphorus-silicon grafted modified polyethylene composite material. The preparation method comprises the following steps: preparing an isocyanate-bridged silicon dioxide-montmorillonite composite filler to improve the dispersity and compatibility of the filler in a matrix, carrying out extrusion granulation on modified polyethylene, an ethylene-butyl acrylate copolymer, maleic anhydride grafted polyethylene, the composite filler, nano magnesium hydroxide and other additives to prepare polyethylene wire harness particles, and finally, carrying out extrusion granulation on the polyethylene wire harness particles to prepare the cable harness. And coating the surface of a copper core wire with the particles through a single-screw extrusion coating machine, and carrying out subsequent water cooling, steam treatment, drying and rolling to obtain a finished wire harness. The wire harness prepared by the invention has excellent high temperature resistance and flame retardance.

The invention discloses a multi-layer composite polypropylene color master batch and a preparation method thereof.The multi-layer composite polypropylene color master batch comprises an inner layer, a middle layer and an outer layer, the inner layer is coated with the middle layer, the middle layer is coated with the outer layer, matrix resin, a composite toughening agent and an interface modifier are subjected to melt blending in a double-screw extruder, nano reinforcing filler is added, extrusion granulation is performed, and the multi-layer composite polypropylene color master batch is obtained. Carrier resin, hyperbranched polyesteramide and a toner pre-dispersion body are mixed at a high speed and then uniformly coated on the outer surface of the inner layer through fluidized bed equipment, and a mixture of a weather-proof additive and a lubricant is attached to the outer surface of the middle layer by adopting an electrostatic spraying process to form the outer layer. According to the multi-layer composite color master batch, the matrix resin and the composite toughening agent have a synergistic effect, so that the impact strength of the color master batch is improved, the cavity structure of hyperbranched polyesteramide is coated with the toner, the silane is used for treating the nano filler to reduce agglomeration and chromatic aberration, the outer layer delays aging, the lubricant reduces the extrusion torque, and the multi-layer composite color master batch is adaptive to a high-speed pipe production line.

The invention discloses an ABS (Acrylonitrile Butadiene Styrene) material for a vehicle-mounted USB (Universal Serial Bus) interface shell and a preparation method thereof, and belongs to the technical field of polymer processing modification. Aiming at the technical contradiction that the heat resistance is improved and the toughness is reduced when the existing ABS material is applied to the vehicle-mounted USB interface shell, the composite formula of 40-60 parts of styrene-acrylonitrile copolymer (SAN), 10-40 parts of ABS high rubber powder, 0-5 parts of toughening compatilizer, 0-30 parts of heat-resistant agent, 0.2-1.0 part of antioxidant and 0.1-0.5 part of lubricant is adopted; the material is prepared through a high-speed mixing-twin-screw extrusion granulation process (the length-diameter ratio is 40: 1-50: 1, and the temperature is controlled to be 150-200 DEG C). The Vicat softening temperature of the material is greater than or equal to 107 DEG C (the highest temperature is 115 DEG C), the notch impact strength is greater than or equal to 10.5 kJ / m, and the material has ultrahigh heat resistance and excellent mechanical properties, can be directly used for injection molding of a vehicle-mounted USB interface shell, and can also be popularized to other ABS workpieces with high heat resistance requirements. The process is simple, continuous production can be realized, the cost is controllable, and the industrial application value is remarkable.

The invention discloses a preparation method of a high-performance electric-breakdown-resistant capacitor base film, which comprises the following steps: S1, preparing modified polypropylene master batch: mixing polypropylene, a cycloolefin copolymer, a barium titanate-carbon nanotube modified composite filler and an antioxidant, and carrying out melt blending, extrusion and granulation to obtain the modified polypropylene master batch; s2, carrying out melt extrusion on the modified polypropylene master batch, cooling and casting; s3, carrying out two-way stretching and heat setting on the obtained casting piece to obtain a polypropylene film; and S4, performing plasma treatment on the surface of the polypropylene film to obtain the high-performance electric-breakdown-resistant capacitor base film. The high-performance electric-breakdown-resistant capacitor base film prepared by the method has excellent electric breakdown resistance, mechanical strength, flame retardance and heat resistance, has a long-acting flame retardant effect, is excellent in comprehensive performance and has a wide market application prospect.

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 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.

The invention relates to the technical field of functional textile fibers, and discloses a high-elasticity textile fiber and a preparation method thereof.The preparation method comprises the following preparation steps that isocyanate, polyol and an organic solvent are mixed and heated, a catalyst is added, stirring reaction is conducted, then a chain extender and a composite conductive additive are added, stirring reaction is conducted, and a polyurethane matrix is obtained; the preparation method comprises the following steps: washing, drying and slicing a polyurethane matrix, extruding and granulating, and carrying out melt spinning and winding to obtain the high-elasticity textile fiber. In the composite conductive auxiliary agent, a tubular structure taking porous silicon dioxide loaded with liquid metal as a core material and graphene-polyaniline as a shell has relatively good tensile property, so that the situation that the liquid metal is easy to separate and separate out when the high-elasticity textile fiber is under a high tensile condition, so that the conductivity is reduced is avoided; and a cross-linked network structure is formed on the surface of the activated conductive filler, so that the impact resistance of the fiber can be enhanced.

The invention relates to a low-cost injection molding bipolar plate based on conductive filler, and particularly relates to the technical field of fuel cells. The bipolar plate comprises 20-40% of a thermoplastic polymer matrix, 30-50% of expanded graphite, 10-30% of a conductive filler and 3-8% of a compatilizer. Wherein the conductive filler is composed of carbon nanotubes, graphene-coated carbon fibers and conductive carbon black according to a specific mass ratio. The preparation method comprises the steps of raw material pretreatment, conductive filler premixing, total mixing, twin-screw extrusion granulation and injection molding. An efficient three-dimensional conductive network is constructed through the synergistic effect of the multi-dimensional conductive filler, and excellent conductive performance is achieved under the condition of low total filler content. The obtained bipolar plate has high conductivity, low contact resistance, good mechanical strength and excellent corrosion resistance, and is suitable for large-scale production through injection molding, and the production cost is remarkably reduced. The bipolar plate is suitable for electrochemical energy conversion devices such as proton exchange membrane fuel cells and flow batteries.

The invention discloses a degradable film blowing material and a processing technology thereof, and relates to the technical field of degradable film blowing materials, the degradable film blowing material comprises the following preparation raw materials by mass: 50-70 parts of modified polylactic acid, 20-50 parts of PBAT resin, 5-20 parts of modified starch, 3-10 parts of nano calcium carbonate, 2-5 parts of talcum powder, 1-5 parts of a dispersant, 1-5 parts of a plasticizer, 0.1-1.0 part of an antioxidant and 0.5-1.5 parts of a lubricant. The processing method comprises the following steps: S1, drying modified polylactic acid and PBAT resin, and plasticizing modified starch; s2, mixing the preparation raw materials of the degradable film blowing material, extruding, and granulating to obtain degradable master batches; and S3, carrying out film blowing molding on the degradable master batch to obtain the degradable film blowing material. The degradable film blowing material is relatively high in tearing strength and notch impact strength, and still keeps a relatively high degradation rate.

The present application relates to the technical field of degradable packaging. Particularly disclosed are a degradable food container and a preparation method therefor. The degradable food container comprises a paper food container base body and a degradable coating applied on the paper food container base body, wherein the degradable coating is prepared from the following raw materials in parts by weight: 40-50 parts of polylactic acid; 10-15 parts of polybutylene succinate; 15-20 parts of polyglycolic acid; 10-20 parts of cassava starch; 5-8 parts of an external additive; 1.2-1.8 parts of montmorillonite; 0.2-0.8 parts of boron nitride nanotubes; and 1.5-2.5 parts of modified hemp fibers. The preparation method therefor comprises: heating polylactic acid, polybutylene succinate and polyglycolic acid to a molten state, then adding cassava starch and an external additive thereto, finally adding montmorillonite, boron nitride nanotubes and modified hemp fibers thereto, performing extrusion granulation, melting and then coating same on the surface of the paper food container base body, cooling same, and then cutting and forming same into a container to obtain the degradable food container. The degradable food container of the present application can exhibit excellent temperature change resistance when being subjected to temperature change caused by an external environment.

The application discloses a kind of compound fertilizer with nitrogen fertilizer slow-release and biocontrol function and preparation method, it is related to microbial compound fertilizer field, including the following components: nitrogen source carrier, physical net trapping material, 3,4-dimethyl pyrazole phosphate, biocontrol component, binder.A kind of preparation method, including the following steps: after silanization modification treatment is carried out to attapulgite, with polyglutamic acid aqueous solution mixed reaction, obtain self-assembly gel;Bacillus subtilis is embedded and handled, rhamnolipid is pre-emulsified, chitosan oligosaccharide is crosslinked with boric acid treatment, and is blended;Nitrogen source carrier is heated to melt, add self-assembly gel, mix evenly;Temperature control, add 3,4-dimethyl pyrazole phosphate, and keep warm reaction;Cooling, add the blend obtained in step S200, binder, mix evenly;Extrusion granulation, after fluidized bed drying, slow-release coating is carried out, and the target compound fertilizer is obtained.The application makes disease control efficiency to improve to 89.2%, and blocks nitrosomonas AMO enzyme activity for 120 days.

The invention discloses a high-stability antistatic master batch for a BOPP (biaxially-oriented polypropylene) film and a preparation method of the high-stability antistatic master batch. The master batch comprises a polypropylene carrier, a core-shell structure composite antistatic agent, a compatilizer, nanoscale SiO2, a stabilizer and a dispersing agent. The preparation method comprises the following steps: firstly, melting and mixing monoglyceride and amide in proportion, and then adding nano SiO2 for high-speed mixing to form a core-shell structure; primarily mixing the polypropylene carrier, the compatilizer, the stabilizer and the dispersing agent; finally, the core-shell structure composite antistatic agent and the primary mixture are subjected to final mixing, and the mixture is subjected to melt extrusion granulation through a double-screw extruder. Through the unique core-shell structure design, the migration rate of the antistatic agent is effectively controlled, so that the prepared BOPP film has lasting and stable antistatic performance, the surface resistance is maintained at 1011-1012 omega, meanwhile, excellent optical performance is maintained, the haze does not exceed 2.0%, and the strict requirements of high-end electronic product packaging are completely met.

This invention provides a permanent antistatic PC material preparation system, comprising a mixing unit, an extrusion granulation unit, and an injection molding unit connected in sequence. The injection molding unit includes a barrel, a screw assembly rotatably disposed within the barrel, and an ERT sensor disposed at a nozzle at the end of the barrel. The ERT sensor includes an electrode array for online acquisition of electrical impedance tomography (EIT) data of the melt passing through the nozzle. The screw assembly includes a screw spindle with a longitudinally penetrating internal heat conduction oil channel. This internal heat conduction oil channel is connected to an external temperature control system via a connector. One section of the barrel is a compression section. A segmented thermal response sleeve is fitted around the outer periphery of the screw spindle within the compression section. The outer surface of the thermal response sleeve is provided with an outer peripheral conveying spiral. The thermal response sleeve responds to changes in the fluid temperature within the internal heat conduction oil channel by generating radial expansion displacement, thereby dynamically adjusting the compression ratio by changing the effective root diameter of the screw assembly within the compression section.

The application provides a preparation method of a polyurethane foaming material. The preparation method comprises the following steps: firstly, pre-polymerization of polytetrahydrofuran ether glycol and hexamethylene diisocyanate; then, mixing, extruding, and granulating of polyhexalactone dihydric alcohol and a catalyst to obtain polyurethane granules. The granules are dried and injection molded into a small embryo to be foamed. The small embryo is immersed in supercritical carbon dioxide, nitrogen is introduced for auxiliary foaming, and gradient pressure relief control is implemented in the foaming process. After foaming, curing treatment is performed to obtain the polyurethane foaming material. The preparation method is beneficial to improving the cell uniformity of the polyurethane foaming material and improving the performance stability of the material after rebound, compression, and aging.

The invention relates to a high-breathability and high-fitness in-vitro fixing device with a shape memory function and a preparation method of the high-breathability and high-fitness in-vitro fixing device, and relates to the field of biomedical materials, the high-breathability and high-fitness in-vitro fixing device comprises the following components in parts by mass: 40-45 parts of polycaprolactone, 40-45 parts of polylactic acid, 4-6 parts of a compatilizer, 0.5-1.5 parts of a cross-linking agent, 8-12 parts of nano-hydroxyapatite, 10-20 parts of biocompatible polyurethane and 0.1-0.3 part of a coloring agent. The preparation method comprises the following steps: mixing the raw materials, carrying out melt blending, and carrying out extrusion granulation to obtain composite particles; the composite particles are subjected to melt-blowing spinning, and non-woven cloth is obtained; and carrying out hot press molding on the non-woven fabric, shaping and cooling to obtain the high-breathability and high-fitness in-vitro fixing device with the shape memory function. The in-vitro fixing device prepared by the invention has a silk net structure, has good air permeability, a shape memory function and fitness, and has good mechanical properties and antibacterial properties.

The invention discloses a low-smoke halogen-free flame-retardant polyolefin sheath material and a preparation method thereof, and the method comprises the following steps: premixing an ethylene-vinyl acetate copolymer, metallocene linear low-density polyethylene, an ethylene-octene copolymer and a maleic anhydride grafted metallocene linear low-density polyethylene / ethylene-octene copolymer to obtain a premix; adding a flame retardant, an antioxidant and a lubricant, and mixing to obtain a mixture; the mixture is subjected to banburying processing, and a plastic melt is obtained; and carrying out extrusion granulation on the plastic melt to obtain the low-smoke halogen-free flame-retardant polyolefin sheath material. The high flame retardance, smoke suppression and mechanical strength of the sheath material can be improved.

This utility model discloses a micro-gap pelletizing device for an extrusion granulator. The micro-gap pelletizing device includes: a device support, a device motor, a moving pelletizing blade, and a fixed pelletizing blade. One of the cutting edges of the moving pelletizing blade and the fixed pelletizing blade has a concave V-shaped structure, while the other has a convex V-shaped structure. The cutting edges of the moving and fixed pelletizing blades form a cutting gap that is larger in the middle and smaller at the edges. The beneficial effect of this utility model is that during the pelletizing process, the larger cutting gap in the middle and smaller at the edges causes the material strips at the two sides to converge towards the middle, preventing the material strips from escaping outside the shearing area.

The invention discloses a metal powder injection molding process based on a thermal degreasing adhesive, and belongs to the technical field of metal powder metallurgy molding, and the metal powder injection molding process comprises the following steps: weighing raw materials, preheating and activating to obtain a premixture, melting and mixing to obtain an adhesive, extruding and granulating, obtaining feeding particles, carrying out injection molding to obtain a product green body, sintering and thermally degreasing, and cooling. A pure thermal degreasing process is adopted, dangerous chemical reagents such as nitric acid and oxalic acid do not need to be used, solvents such as n-pentane and carbon tetrachloride do not need to be depended on, in actual production, potential safety hazards in the production link can be greatly reduced, damage to the ecological environment is reduced, meanwhile, the body health of operators is guaranteed, and the production cost is reduced. The core requirements of modern industry on safe and environment-friendly production are met.

The utility model discloses a pelletizing device of extrusion pelletizing equipment, which comprises an extrusion die disc, the front part of a conveying rotating shaft is movably connected in a middle through hole of the extrusion die disc, the front end of the conveying rotating shaft extends out of the front end of the middle through hole of the extrusion die disc, and the middle part of the front end surface of the conveying rotating shaft is in threaded connection with a fixed screw rod; a knife rest connecting cylinder is fixed to the fixing screw rod, a plurality of threaded connection holes extending in the radial direction are formed in the outer side wall of the rear end of the knife rest connecting cylinder, the screw rod part of a knife connecting rod is connected into the corresponding threaded connection hole in a threaded mode, and a dicing blade is installed on the knife connecting rod; the cutting end of the grain cutting blade is tightly attached to the front end face of the extrusion die disc and faces a corresponding extrusion through hole formed in the extrusion die disc; the cutter connecting rod can be positioned through the positioning rod in the unscrewed state, normal use of the cutter connecting rod is guaranteed, and the cutter connecting rod cannot be unscrewed or fall off continuously, so that the inclination angle between the installed pelletizing blade and the front wall face of the extrusion die disc is guaranteed, and normal cutting use is guaranteed.

The invention belongs to the field of agricultural biology, and particularly discloses a fulvic acid extrusion granulation microbial agent and a production process thereof, and the fulvic acid extrusion granulation microbial agent comprises the following components in parts by weight: 76-107 parts of an inner core and 24-37 parts of a shell; the inner core comprises 30-45 parts of ultrasonic activated fulvic acid, 8-12 parts of heat-resistant composite microbial powder, 15-20 parts of light calcium carbonate, 3-5 parts of molasses and 20-25 parts of attapulgite; the shell comprises 5-8 parts of a heat-sensitive microbial agent, 4-6 parts of a composite protective agent, 3-5 parts of cold-soluble modified starch, 2-3 parts of sodium alginate and 10-15 parts of fulvic acid fine powder; the heat-sensitive bacteria are independently arranged on the shell layer, the normal-temperature centrifugal coating and powder lamination process is adopted, the cell protection effect of the composite protective agent is matched, the processing survival rate of the heat-sensitive bacteria is greatly improved, and meanwhile, the cold-soluble modified starch-sodium alginate barrier layer of the shell ensures the viable bacteria retention rate of the heat-sensitive bacteria during long-time storage and transportation.

The present application relates to a kind of toughened heat-resistant full biodegradable polylactic acid packaging material and its preparation method.Polylactic acid, PBAT, corn starch, stearic acid starch ester, mannitol, epoxy-terminated PBAT-PLA block oligomer, PDLA grafted white carbon black and processing aid are dried, premixed plasticized, melt reaction blending, extruded and granulated and formed, to obtain packaging material.Epoxy-terminated PBAT-PLA block oligomer improves interface compatibility and toughening, PDLA grafted white carbon black promotes crystallization and stereocomplex crystal formation, and both synergistically improve material toughness, impact resistance, heat resistance and hot water dimensional stability.

This invention relates to the field of polymer materials technology, specifically disclosing the application of low melt flow index (MFI) polyoxymethylene (POM) in improving the spinning performance of POM. Using heteropolyacids as catalysts, and controlling the polymerization temperature and the amount of heteropolyacid catalyst added, low MFI POM with a melt flow index of 0.1 g / 10 min to 2.5 g / 10 min was prepared. After compounding this low MFI POM with a heat-stabilizing agent in a certain proportion, it was blended with general-purpose POM and extruded into granules. Unexpectedly, the thermal stability of the POM was significantly improved, and it also exhibited moderate rheological properties. When applied to the melt spinning process, the spinnability of the POM was significantly improved. Compared with the POM without the addition of this low MFI, the draw ratio increased by approximately 1.4 times, and the tensile strength of the POM fiber reached 6–8 g / d, a maximum increase of approximately 1.4 times. The yield and strength of the finished fiber product were significantly improved.

The application relates to the technical field of composite material injection molding, in particular to a production method of an automobile plastic part, which comprises the following steps: S1. mixing thermoplastic styrene elastomer, 50% glass fiber reinforced polyamide 6, maleic anhydride grafting compatilizer, double-reactive compatilizer, interface nucleating agent and dispersion aid, then extruding and granulating to form a soft glue master batch; S2. using polyamide 6 to prepare a hard glue by adopting an injection molding process, and then injection molding the soft glue master batch on the surface of the hard glue to prepare a combination; and S3. stage cooling the combination to prepare the automobile plastic part. By combining the double-reactive compatilizer and the interface nucleating agent, and cooperating with the low-temperature and low-speed injection molding process and the multi-stage cooling process, the compatilizer forms the double-connection effect of chemical bonding and physical entanglement at the interface, a transition layer of chemical bonds, molecular chain interlocking and nano particle anchoring is formed between the polyamide 6 and the thermoplastic styrene elastomer, and therefore the interface bonding strength of the hard glue and the soft glue is greatly improved.