694 results about "Melt extrusion" patented technology

The present invention relates to the field of polyurethane materials and particularly to a temperature-induced color-changing vehicle film and a preparation method therefor. The method of the present invention comprises: firstly, using polyurethane to wrap vanadium dioxide powder to obtain color-changing microcapsules; then using 1,1,1,3,5,5,5-heptamethyltrisiloxane and 3-allyloxy-1,2-propanediol as raw materials to synthesize an organosilicon-modified diol, and enabling trimellitic anhydride to react with toluene diisocyanate to synthesize a dicarboximide compound; enabling the organosilicon-modified diol and the dicarboximide compound to undergo an esterification reaction and a polymerization reaction to obtain an organosilicon-modified imide polyester diol; then mixing the organosilicon-modified imide polyester diol with polytetrahydrofuran ether glycol 2000, and then enabling the mixture to react with toluene diisocyanate to obtain a polyurethane elastomer; and mixing the polyurethane elastomer, the color-changing microcapsules, a silane coupling agent, a plasticizer, an antioxidant, and an ultraviolet light absorber, followed by melt extrusion and blow molding into a film, so as to obtain the temperature-induced color-changing vehicle film.

The invention relates to the technical field of films, in particular to a high-surface tension aluminized base film and a preparation method thereof. The method comprises the following steps: grafting modified fumed silica with a silane coupling agent KH-570, and grafting a ternary polymerization shell layer composed of 2-acrylamide-2-methylpropanesulfonic acid, lauryl methacrylate and glycidyl methacrylate on the surface of the modified fumed silica to obtain organic anti-sticking silica; secondly, synthesizing an aromatic sulfonated polyester prepolymer, loading nano titanium dioxide, and carrying out melt blending extrusion with polypropylene to form polar cluster polypropylene master batches; and finally, blending polypropylene resin, the master batch and maleic anhydride grafted polypropylene, and carrying out melt extrusion, air cooling and slow cooling and two-way stretching molding. The obtained base film is high in surface tension, high in aluminized layer adhesive force, excellent in oxygen and water vapor barrier property, good in thermal stability and suitable for the field of high-end packaging.

An antibacterial polymer having a molecular weight above a certain level, which is highly miscible with other polymers compared to a monomolecular type antibacterial agent and can be added during the melt extrusion process. Further the antibacterial polymer has the advantage of exhibiting excellent antibacterial properties against Gram-negative bacteria and does not elute over time.

The invention belongs to the technical field of textile material processing, and particularly discloses a preparation method of high-strength low-shrinkage composite yarn for spinning. A preparation method of a high-strength low-shrinkage composite yarn for spinning comprises the following steps: (1) respectively drying ultra-high molecular weight polyethylene and PET polyester, adding maleic anhydride grafted PE, a treated metal organic framework material, boron carbide nanoparticles, cellulose acetate and a silane coupling agent KH550, uniformly mixing, and carrying out melt extrusion to obtain nascent fibers; (2) performing first-stage pre-drafting, second-stage high-temperature tension field drafting and third-stage low-temperature relaxation treatment on the nascent fiber to obtain treated fiber; and (3) dipping the treated fiber in an ethanol solution containing nano SiO, and performing infrared radiation curing to obtain the high-strength low-shrinkage composite yarn for spinning. The composite yarn has good mechanical strength, wear resistance and low contractibility, and the yarn has wide application due to the high breaking strength.

The invention relates to the technical field of polymer functional material processing, and particularly discloses a polyethylene waterproof breathable film using PTFE micro powder as an opening agent and a preparation method of the polyethylene waterproof breathable film. The waterproof breathable film is prepared from the following components in parts by weight: 50-70 parts of linear low-density polyethylene, 10-40 parts of PTFE (Polytetrafluoroethylene) micro powder, 3-8 parts of a modified compatilizer and an auxiliary agent. The preparation method comprises the following steps: S1, activating PTFE micro-powder by a silane coupling agent and coating the PTFE micro-powder with polyethylene wax to obtain modified micro-powder; s2, uniformly mixing all the components; s3, carrying out melt extrusion at 180-210 DEG C through a double-screw extruder, and carrying out tape casting to form a cast sheet; s4, the casting piece is heated to 90-115 DEG C for two-way stretching, and micropores are formed through interface stripping between the PTFE particles and the base body; and S5, carrying out heat setting at 120-130 DEG C, cooling, and rolling to form the film. Through the synergistic effect of the self-made compatilizer and the pretreatment process, the interface anchoring force is enhanced, the problems of powder falling and water leakage of highly-filled PTFE are solved, and meanwhile, high moisture permeability, high hydrostatic pressure resistance and high mechanical property are taken into account.

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 discloses an anti-bending ABS composite material for clothes hangers and a production process of the anti-bending ABS composite material, and relates to the technical field of plastic products. The anti-bending ABS composite material for the clothes hanger is prepared from the following raw material components in parts by mass: 100 to 120 parts of ABS resin, 10 to 15 parts of SAN resin, 20 to 30 parts of reinforcing auxiliary materials, 20 to 25 parts of antioxidant auxiliary materials, 0.5 to 1.5 parts of lubricating agents and 1 to 2 parts of light stabilizers, wherein the reinforced auxiliary material is prepared by the following steps: putting carboxymethyl cellulose into deionized water, continuously stirring for 2-3 hours, adding modified polyaspartic acid and calcium chloride, stirring and mixing, adding short carbon fibers, stirring for 20-30 minutes, adding a sodium carbonate solution, stirring and reacting for 0.5-2 hours, filtering, washing and drying to obtain the modified short carbon fibers; and mixing the mixture with SEBS-g-MAH, carrying out melt extrusion at 220-240 DEG C, and pelletizing to obtain the reinforced auxiliary material.

The invention discloses a high-rigidity flame-retardant high-CTI polyphenylene sulfide material and a preparation method thereof, and relates to the technical field of polyphenylene sulfide. Comprising the following steps: S1, adding glass fibers and a silane coupling agent into an ethanol water solution, and stirring for reaction to obtain modified glass fibers; s2, uniformly mixing polyphenylene sulfide resin powder, modified glass fibers, modified calcium sulfate whiskers, modified hyperbranched polyphenylene sulfide, a processing aid and an antioxidant, and performing melt extrusion granulation to obtain the high-rigidity flame-retardant high-CTI polyphenylene sulfide material, according to the invention, the polyphenylene sulfide resin powder is used as a matrix, the calcium sulfate whisker modified by in-situ polymerization of glass fiber and nylon is introduced as a filler for synergistic enhancement, and the modified hyperbranched polyphenylene sulfide is added as reinforcing and toughening resin, so that the polyphenylene sulfide material has rigidity and toughness, and meanwhile, the material has excellent stability and flame retardancy, and is suitable for industrial production. The formation of a carbonization passage can be effectively inhibited, and the tracking index of electric leakage is obviously improved.

The invention belongs to the technical field of polymer compositions, and particularly relates to a high-weather-resistance artificial turf and a preparation method thereof. The high-weather-resistance artificial turf is prepared from the following components in parts by mass: 125 to 160 parts of matrix resin, 8 to 12 parts of coloring master batch, 6 to 8.5 parts of microcapsule compound, 5.8 to 10 parts of functional additive and 3 to 7 parts of lubricant, wherein the microcapsule is prepared by compounding a shell material obtained by reacting diisocyanate with polyamine and a core material which is a phase change material. The preparation method comprises the following steps: premixing matrix resin, coloring master batch, a microcapsule compound, a functional additive and a lubricant, and carrying out melt extrusion, wire drawing and shaping to obtain the artificial grass. And implanting the artificial grass into the base cloth, and carrying out gum coating, cutting and rolling to obtain the high-weather-resistance artificial turf. The microcapsules and the hydroxypropyl methyl cellulose are doped in the matrix resin, so that the artificial turf still has stable elasticity, strength and wear resistance in complex temperature and humidity environments.

The application discloses a polypropylene woven bag and a preparation method thereof. The polypropylene woven bag is woven by a woven material, and the woven material comprises the following components in parts by weight: polypropylene 90-110 parts, alumina whisker 8-12 parts, carbon nanotube with surface modified polydopamine 0.5-1 part, calcium stearate lubricant 0.5-1 part, ethylene-butyl acrylate-maleic anhydride terpolymer compatibility agent 5-10 parts, and antioxidant 0.3-0.6 part. The preparation method comprises the following steps: adding the components of the woven material into a high-speed mixer, and mixing to obtain a mixture; feeding the mixture into an extruder, and performing melting extrusion, cooling, stretching and setting to prepare polypropylene flat filaments; cross-weaving the polypropylene flat filaments into woven cloth, performing pattern printing on the surface of the woven cloth, and then sequentially performing cutting, sewing or bonding to seal the bottom, so that the polypropylene woven bag is prepared. The polypropylene woven bag obtained by the method has excellent wear resistance and good toughness.

The application discloses a bamboo-based polyolefin composite material for rattan mat silk and a preparation method thereof, and mainly relates to the field of bamboo-plastic materials. The bamboo-based polyolefin composite material comprises a bamboo-based reinforcing phase, a compatilizer, a matrix and a toughening agent. The bamboo-based reinforcing phase contains 40-60 wt% of bamboo powder with a particle size of 80-120 meshes. The method comprises the following steps: S1, raw material pretreatment; S2, premixing; S3, main mixing; and S4, melt extrusion. The bamboo-based polyolefin composite material has the advantages that the optimal matching of the bamboo-based reinforcing phase and the compatilizer maximizes the interface bonding strength, solves the problem of poor interface bonding of traditional bamboo-plastic composite materials, and prepares a bamboo-plastic material suitable for producing rattan mats and having high toughness, good skin friendliness, good air permeability and good antibacterial property.

The invention belongs to the technical field of fabrics, and particularly relates to a preparation method of a cool superfine fiber fabric, clean sepiolite particles and graphene oxide powder are obtained by grinding and cleaning sepiolite and cleaning graphene oxide powder, and then melt extrusion is performed on the sepiolite particles and the graphene oxide powder, PET slices, an antioxidant and a dispersing agent to obtain the cool superfine fiber fabric. And spinning and weaving to obtain the cool superfine fiber fabric. According to the cool fabric, the defects of an existing cool fabric are overcome, the adsorption difference between the sepiolite fine powder and graphene oxide is utilized to form separable adsorption of dust and water, and meanwhile, due to the strong water absorption of sepiolite and the variability of a pore structure, the dust adsorption difficulty is greatly improved, and combination of dust and water is reduced.

The invention relates to a hot melt adhesive film for bonding TPO and an epoxy plate and a preparation method thereof, the hot melt adhesive film comprises the following raw materials by mass: 10-30 parts of a polyolefin elastomer, 20-40 parts of synthetic rubber, 10-30 parts of modified synthetic rubber, 10-30 parts of tackifying resin, 10-30 parts of softening oil, and 1-5 parts of a cross-linking agent. The modified synthetic rubber is a mixture of maleic anhydride grafted SEBS rubber and epoxy modified SBS rubber; uniformly mixing the polyolefin elastomer, the synthetic rubber, the modified synthetic rubber, the tackifying resin and the softening oil, and granulating through a granulator; and uniformly mixing a cross-linking agent and the obtained particles, putting the mixture into a double-screw extruder, and carrying out melt extrusion to obtain the hot melt adhesive film. The hot melt adhesive film disclosed by the invention has high bonding strength on TPO and epoxy plates, and is simple in preparation process and convenient to use.

This invention provides a low-warpage composite PC reinforced material and its preparation method, relating to the field of composite material technology. The preparation method includes: mixing polycarbonate, polysiloxane-PC copolymer, aramid pulp-resin blend, and silica-alumina powder to obtain a first mixture; adding additives to the first mixture and mixing again to obtain a second mixture; feeding the second mixture and glass fiber into a twin-screw extruder for melt extrusion, cooling, and pelletizing to obtain the composite PC modified material. The composite PC modified material obtained by this method exhibits high strength and strong dimensional stability, and is less prone to warping when manufactured into products, making it widely applicable in products such as mobile phone lens holders.

This invention relates to the field of composite current collector base film materials, and discloses a heat-resistant and aging-resistant composite current collector base film and its preparation process. It is prepared by melt extrusion and stretching of the following raw materials in parts by weight: 100 parts PET resin, 12-25 parts multi-component composite reinforcing filler, and 0.5-3 parts lubricant. The multi-component composite reinforcing filler is prepared through the following steps: S1, halloysite nanotubes are composited with aminated mesoporous alumina, modified, and then loaded with an antioxidant to obtain functionalized halloysite nanotube-alumina composite particles; S2, magnesium oxide is deposited on graphene oxide, and modified to obtain a modified graphene oxide-magnesium oxide composite; S3, after blending, polymer grafting is performed to obtain the multi-component composite reinforcing filler. This invention, through the multi-component composite reinforcing filler in PET resin, can comprehensively improve the heat resistance, aging resistance, and bonding strength between the base film and the metal layer of the PET resin-based composite current collector base film.

The invention discloses an anti-scraping thin coating type powder coating plate and a preparation method thereof, and relates to the technical field of coating materials and metal surface treatment. According to the scheme, the method comprises the following steps: forming a film on the surface of a degreased, alkali-washed and passivated metal substrate by adopting an interface modification liquid containing a silane coupling agent KH-590; and performing melt extrusion on a powder coating prepared from a hydroxyl-terminated polyether-ether-ketone / bisphenol A type epoxy silane grafted composite resin matrix, a triglycidyl isocyanurate / caprolactam composite curing agent and a titanate modified nano composite filler, and then performing electrostatic spraying and curing to obtain a coated plate with a dry film thickness of 20-40 [mu] m, wherein the powder coating is prepared from the hydroxyl-terminated polyether-ether-ketone / bisphenol A type epoxy silane grafted composite resin matrix, the triglycidyl isocyanurate / caprolactam composite curing agent and the titanate modified nano composite filler. The invention has the following beneficial effects: the interface modification layer and the silicon-containing grafted resin cooperate to improve the interface bonding force, boiling resistance and salt spray resistance; the multi-scale hard filler constructs a reinforced skeleton in the film, so that the scratch resistance is improved while the mechanical property is maintained, and thin coating and powder saving are realized under the condition of ensuring the decoration and durability.

The invention relates to the technical field of polyvinyl chloride, and discloses a flame-retardant plasticized PVC decorative film and a preparation process, the PVC decorative film comprises 100 parts by weight of polyvinyl chloride, 10-30 parts by weight of a composite plasticizer, 10-25 parts by weight of an inorganic flame retardant and the like; polyvinyl chloride, the composite plasticizer and the like are mixed, melt extrusion and blow molding are performed, and the flame-retardant plasticized PVC decorative film is obtained. The organic silicon phosphate contains a plurality of alkyl ester structures, so that the flexibility and the elongation at break of the polyvinyl chloride are improved. The flame-retardant polyvinyl chloride material contains flame-retardant phosphorus and silicon elements, has a good condensed-phase char-forming flame-retardant effect, has a good synergistic flame-retardant effect with aluminum hydroxide and other inorganic flame retardants, improves the limit oxygen index of polyvinyl chloride, can maintain good flame-retardant performance, and can be prepared into a building decorative film with high strength, good flexibility and excellent flame retardance.

This invention provides a highly transparent, low-stress, wide-process-window PETG-modified composite material, composed of the following components: PETG matrix resin, transparent copolyester compatible modified resin, composite thermo-oxidative degradation stabilizer, and transparent core-shell toughening stress modifier. The low-shear granulation process for this composite material includes the following steps: ingredient mixing, low-shear melt extrusion, strip-forming with water cooling, and constant-temperature, low-humidity storage. The low-stress injection molding process for this composite material includes the following steps: drying conditions, screw selection, barrel temperature control, injection control, and mold structure optimization design. Through reasonable formulation ratios, synergistic design, combined with low-shear granulation to reduce material degradation, and optimized injection molding processes, the material's moisture absorption, thermal stability, processing performance, molding performance, and service performance are comprehensively improved, broadening its application scenarios and improving mass production efficiency and part yield.

The invention relates to the technical field of modified PP particles, in particular to a measurable long glass fiber modification method. The invention provides a measurable long glass fiber modification method which comprises the following steps: mixing polypropylene, polypropylene grafted maleic anhydride and an auxiliary agent to obtain a mixture; and conveying the mixture into a twin-screw extruder for blanking, blanking the long glass fiber placed on a metering scale through a natural exhaust port, and sequentially carrying out melt extrusion, granulation and drying to obtain the long glass fiber modified PP particles. The modification method is controllable in the production process, the number of adjustment times is small, and the addition proportion deviation is small.

The application discloses a preparation method and application of LCP film and belongs to the technical field of polymer material processing. The preparation method of the LCP film is characterized by comprising the following steps: S1, melt extrusion; S2, mold preparation; S3, mold traction; S4, mold inflation; S5, film bubble flattening; and S6, film pressing, so that the LCP film is obtained. The preparation method combines the film blowing method and the calendering method, first utilizes the bidirectional rotating mold head with the outer mold body and the core rod having opposite rotating directions to regulate and control the molecular orientation arrangement structure in the LCP film, makes the LCP molecular structure form a woven net structure, avoids the problem that the longitudinal and transverse tensile properties are greatly different due to the LCP molecular orientation order, then through the pressing step, the double-layer LCP film is pressed into a single-layer LCP film, and the problems of poor film thickness uniformity and uneven film winding are solved.

A gastro-resistant high-strength unit dosage form includes a solid solution prepared by hot-melt extrusion, whereby the solid solution contains 300 mg posaconazole and an enteric polymer in a specific weight ratio. The unit dosage form may be a capsule or an optionally film-coated tablet.

The invention relates to a seawater degradable seedling raising frame and a preparation method and application thereof.The preparation method of the seawater degradable seedling raising frame comprises the following steps that (1) modified biodegradable plastic is prepared, specifically, a non-enzymatic seawater degradation accelerator, an enzymatic seawater degradation accelerator, a surface hydrolysis inhibitor and a small amount of biodegradable resin are mixed and subjected to melt extrusion, and the modified biodegradable plastic is obtained; the extrusion temperature is 140-180 DEG C, high-concentration master batches are prepared, the master batches and the remaining biodegradable resin are mixed, melt extrusion is conducted again, the extrusion temperature is 160-190 DEG C, cooling and granulation are conducted, and the modified biodegradable plastic is obtained. (2) modified biodegradable plastic is placed in an injection molding machine, heated to a molten state and then injected into a seedling raising frame mold, demolding operation is conducted after injection molding is completed, and the seawater degradable seedling raising frame is formed and can be controllably degraded to meet the requirement for the growth cycle of sea grass, is harmless to the environment and promotes recovery of a sea grass bed ecological system; sustainable marine ecological restoration is realized.

The invention belongs to the technical field of solid waste treatment and utilization, and particularly relates to modified manganese slag and application thereof in preparation of a cement material. The modified manganese slag disclosed by the invention is prepared by a method comprising the following steps: uniformly mixing maleic anhydride grafted polyethylene, epoxy group modified manganese slag, epoxy group modified nano alumina fiber and epoxy group modified basalt fiber, and then performing melt extrusion to obtain a polyethylene grafted manganese slag-polybasic fiber compound, and uniformly mixing the polyethylene grafted manganese slag-polybasic fiber compound and 5-chlorosulfonyl-2-hydroxybenzoic acid, and carrying out melt extrusion to obtain the modified manganese slag. The basalt fiber and the nano alumina fiber are combined with the manganese slag through chemical bonds and polyethylene long chains to form a compound, so that the combination stability and dispersion uniformity of the basalt fiber, the alumina fiber and the manganese slag can be improved, and the basalt fiber and the alumina fiber can play an anchoring role in a cement material; the mechanical strength and the low-temperature freezing resistance of the cement material are improved.

This invention discloses a method for preparing a heat-resistant, flame-retardant, and electrically breakdown-resistant modified polypropylene capacitor base film, comprising the following steps: S1, preparing composite intercalated organic montmorillonite and microcapsule-type reinforcing particles; S2, preparing modified polypropylene masterbatch: mixing polypropylene masterbatch, composite intercalated organic montmorillonite, microcapsule-type reinforcing particles, initiator, and additives, heating and stirring to obtain modified polypropylene masterbatch; S3, adding polyvinylidene fluoride to the premix, heating and stirring, and melting and extruding the resulting mixture; S4, cooling and casting; S5, biaxial stretching, heat setting, cooling, and corona treatment to obtain a heat-resistant, flame-retardant, and electrically breakdown-resistant modified polypropylene capacitor base film. This invention, by filling and modifying polypropylene with composite intercalated organic montmorillonite and microcapsule-type reinforcing particles, and by compounding with polyvinylidene fluoride, comprehensively improves the heat resistance, flame retardancy, electrical breakdown resistance, and mechanical strength of the polypropylene capacitor base film.

The application discloses a moisture-absorbing and sweat-releasing polyester low-elasticity filament, which comprises 85-95 parts of a copolymer type moisture-absorbing modified polyester chip, 3-8 parts of toughening compatible master batch and 2-7 parts of anti-oxidation lubrication functional master batch, and a preparation method of the moisture-absorbing and sweat-releasing polyester low-elasticity filament, which comprises the following steps: S1, drying raw materials; S2, melt extrusion; S3, pre-setting of a special-shaped section; S4, spinning cooling; S5, stretching and elasticizing; S6, wave curling setting; and S7, winding forming. According to the application, the section structure of the polyester low-elasticity filament is improved, the symmetrical crescent concave groove penetrating through the axial direction is formed, the natural capillary wetness guide path is constructed according to the inherent form of the filament body, the modification of the chemical hydrophilic coating is not needed, the integrated section groove structure is stable, the appearance can be kept complete after the weaving friction and multiple water washing, the long-lasting wicking water conveying capacity of the fabric is endowed from the fiber origin, and the disadvantage of the wetness performance attenuation after long-term use is avoided.

A packaging film includes a gas barrier film, an adhesive layer, and a sealant layer in this order. The gas barrier film includes a substrate layer, an anchor coat layer, and a vapor deposition layer in this order, the substrate layer includes a polyolefin substrate layer containing a polyolefin-based resin, the anchor coat layer contains a polyurethane resin, and the anchor coat layer has a thickness of 0.02 μm or more. The adhesive layer is obtained by bonding an adhesive resin composition containing a polyolefin adhesive resin to the gas barrier film by melt extrusion, and the sealant layer contains a polyolefin-based resin.

This invention relates to the field of glass interlayer film technology, specifically to an interlayer film for glass that combines heat insulation and sound insulation properties, its preparation method, and its application. The preparation steps include: S1. Preparation of an anti-shrinkage modifier; S2. Mixing PVB resin powder, plasticizer, anti-shrinkage modifier, modified sound and heat insulation microspheres, auxiliary modifier, and UV absorber UV-326 at room temperature until homogeneous to obtain a composite mixture; S3. Feeding the composite mixture into a co-rotating twin-screw extruder for melt extrusion, flowing out through a T-die, calendering and cooling with a three-roll calender, and then cutting and winding it online to obtain the interlayer film. The synergistic effect of the modified sound and heat insulation microspheres, anti-shrinkage modifier, and auxiliary modifier in this invention, achieving deep synergy in structure, function, and interface, solves the industry technical bottleneck of traditional PVB interlayer films where sound and heat insulation are difficult to achieve simultaneously, and performance and durability are mutually restrictive. This provides an innovative glass interlayer film that combines high performance, high durability, and high processability.

The invention discloses an ultra-silence HDPE pipe for building drainage and a preparation method thereof.The HDPE pipe is formed by co-extruding and compounding an inner layer, a middle silence layer and an outer layer, and the inner layer and the outer layer are each prepared from HDPE, an antioxidant, a lubricating agent and pigment according to a certain proportion; the middle mute layer is prepared from HDPE (high-density polyethylene), modified mica powder, Expancel pre-expanded microspheres, maleic anhydride grafted polyethylene, an elastomer, a lubricant and an antioxidant according to a certain ratio. The preparation method of the HDPE pipe comprises the following steps: adding the inner-layer mixture into a first extruder for melt extrusion, adding the middle mute layer mixture into a second extruder for melt extrusion, adding the outer-layer mixture into a third extruder for melt extrusion, then carrying out co-extrusion molding through a co-extrusion mold, and then carrying out cooling shaping, thus obtaining the HDPE pipe. The ultra-silence HDPE pipe for building drainage is obtained. The HDPE pipe provided by the invention has good mute performance, high temperature resistance and toughness, and other performances meet the requirements.

The invention relates to the technical field of materials, and discloses a polypropylene material with high strength and strong anti-pressure ability and a preparation method, the polypropylene material is prepared by taking polypropylene as a base material and a linen fiber modified additive and the like as auxiliary materials through mixing and extrusion processes, the linen fiber modified additive is prepared by modifying macromolecular substances with norbornane-erythritol alternate connection structures on the surfaces of linen fibers, and the macromolecular substances can react with anhydride groups of maleic anhydride grafted polypropylene in the subsequent melt extrusion process, so that interlocking can be formed between the linen fibers and a polypropylene matrix; according to the present invention, the macromolecular substance structure contains the high bond energy silicon-oxygen bond and the rigid ring structure, such that the stability of the polypropylene can be improved so as to further enhance the impact resistance and other mechanical properties of the polypropylene.

This invention relates to the field of melt extrusion equipment technology, and discloses a hot melt extrusion device, including an extruder body, a feed pipe fixed on the extruder body, a hopper above the extruder body, a distribution box connected to the lower end of the hopper, and the discharge port of the distribution box connected to the feed pipe. The hopper contains several rotatable scraper blades and a movable conical guide head. The distribution box contains a rotatable distribution roller with several distribution grooves. Material in the hopper can flow quantitatively into the feed pipe of the extruder body, avoiding blockage due to flowability. Extrusion plates in the distribution grooves facilitate the movement of the distribution roller while rotating, crushing agglomerated material into smaller particles, improving flowability, preventing feed pipe blockage, and improving product processing quality.