502 results about "Melt mixing" patented technology

The invention relates to the technical field of control systems, in particular to a melt mixing parameter real-time feedback control system for color master batch production. The method comprises the following steps: acquiring a corresponding process parameter reference through a parameter reference setting module; carrying out risk assessment through a grading module to obtain risk grades and carrying out grading processing; constructing a global optimization model through a control sequence module; a target evolutionary algorithm is started in combination with the technological parameter benchmark, and the technological parameter adjustment amount is calculated and a regulation and control sequence is generated by analyzing the dynamic coupling correlation among the technological parameters and the comprehensive influence on the whole; and finally, the process parameters are adjusted through a closed-loop control module, and real-time closed-loop feedback control is formed. The defects exist in real-time feedback and accurate control links of parameters in a color master batch melting and mixing process. Therefore, the invention provides a melt mixing parameter real-time feedback control system for color master batch production.

The invention relates to the technical field of injection molding waste plastic recovery, in particular to injection molding equipment and a process for producing plastic automobile ornaments. The equipment comprises an injection machine and an online recycling mechanism, the injection machine is provided with a double-channel solution cavity composed of a new material main runner and a waste material returning cavity, and the tail ends of the two channels converge in a 30-degree Y shape; the on-line recovery mechanism comprises a waste conveyor belt, a crushing mechanism and a transmission device, a magnetic separation impurity removal device is arranged in the crushing mechanism, and a discharge end is connected with the batching mechanism. Through double channels and a Y-shaped confluence structure, production waste is subjected to online recovery and crushing and then is fused, mixed and reused with new materials, the waste utilization rate is increased, and the cost is reduced. The magnetic separation and impurity removal device efficiently removes metal impurities through the movement of inclined avoiding, rotary impurity scraping and inclined discharging of a scraping plate; the batching mechanism removes dust to prevent impurities from affecting melt performance. The crushing device adapts to different waste materials, airflow assists discharging to improve the efficiency, and the green production concept is met.

The invention discloses a multilayer co-extrusion heat-shrinkable film and a preparation method thereof, the film comprises an outer wear-resistant layer, a middle support layer and an inner functional layer, the thickness ratio of each layer is 1: 3: 1-1: 5: 1, the total thickness is 50-150 [mu] m, and the raw materials are prepared according to respective formulas. The preparation method comprises the steps of raw material preparation, melt mixing, die head extrusion, two-way stretching, water-cooling shaping, electronic crosslinking, aging treatment, heating softening and cold and hot shaping. The carbon nanotubes (CNT) and the h-BN nanosheets synergistically hinder crack propagation in the middle layer, so that the crack propagation resistance of the film is remarkably improved, the tensile strength, the thermal shrinkage rate and other properties are also optimized, compared with a traditional film, the comprehensive properties of wear resistance, high strength and high thermal shrinkage rate are achieved through interface collaborative design, meanwhile, the production cost is reduced by 20-30%, and the application prospect is wide. The method is suitable for food packaging, electronic device protection and other fields.

The invention relates to the technical field of hollow fiber preparation processes, in particular to a preparation process of a hollow fiber fabric with heat preservation, dryness and moisture absorption functions. The process comprises the following steps: firstly, selecting polyester, polylactic acid and polyester master batch as spinning raw materials, carrying out melt mixing, and carrying out hollow melt spinning by adopting a hollow fiber spinning plate to obtain hollow fibers; then, the hollow fiber obtained through spinning is made into yarn, and after the water washing or alkali washing process is conducted, the hollow fiber fabric is obtained through the weaving process; finally, the hollow fiber fabric is subjected to dipping modification treatment with the modification finishing liquid, and the hollow fiber fabric with the heat preservation, dryness and moisture absorption functions is obtained. Polyester and a small amount of polylactic acid are blended and then spun to obtain the hollow fiber, polyester master batches are added into the hollow fiber at the same time, the fiber wall of the hollow fiber can be damaged through subsequent water washing and alkali washing processes by means of addition of the master batches and the effect of the polylactic acid, moisture absorption is facilitated, and therefore the moisture absorption effect is improved; the prepared hollow fiber has a unique hollow structure, so that air is easily stored in the hollow structure, and a certain warm keeping effect is achieved; a certain groove structure is formed in the surface of the fiber, so that the fiber has a capillary effect and a good warm-keeping effect; the hollow fibers not only can quickly absorb moisture through the damaged outer wall, but also can facilitate moisture volatilization by virtue of the air permeability of the hollow fibers, so that the fabric can be quickly kept dry and comfortable.

The present application relates to the technical field of bio-based polymer material, and more particularly to a full bio-based PBAT-PLA copolymer, a preparation method and an application thereof, which is prepared by melt mixing bio-based polybutylene adipate terephthalate, bio-based polylactic acid and bio-based multi-epoxy chain extender through a twin-screw extruder, so that the tensile strength of the full bio-based PBAT-PLA copolymer is 31.5-44.3 MPa, and the elongation at break is 85-498%. The bio-based multi-epoxy chain extender prepared by specific selection can simultaneously improve the tensile strength and elongation at break of the full bio-based PBAT-PLA copolymer, and solve the technical problems of poor compatibility of traditional bio-based polylactic acid and non-bio-based polybutylene adipate terephthalate, and the technical problem that the addition of existing chain extenders cannot simultaneously improve the tensile strength and elongation at break of the copolymer.

The invention discloses a preparation method of a polyurethane material with a shape memory function, biocompatibility and degradability, which comprises the following steps: (1) melting and mixing hydroxyl-terminated polyether or polyester polyol and isosorbide in a nitrogen atmosphere, and then adding diisocyanate for prepolymerization; (2) adding hexahydro-1, 3, 5-tris (hydroxyethyl)-s-triazine into the pre-polymerized solution, stirring, dissolving and reacting, and then pouring the mixed solution into a mold; and (3) placing the mold under the condition of 80 DEG C to volatilize the solvent, and curing to obtain the polyurethane film. The polyurethane film prepared by the invention has excellent mechanical properties. Meanwhile, the polyurethane film has good biocompatibility, a shape memory function and dual degradability. Compared with the traditional polyurethane material, the polyurethane material prepared by the method disclosed by the invention takes the biomass-based compound isosorbide as a raw material, integrates excellent comprehensive performance, functionality and degradability, and is a novel sustainable material with wide application.

The invention relates to the technical field of degradable plastics, in particular to a flame-retardant biodegradable plastic and a preparation method and application thereof.The flame-retardant biodegradable plastic is prepared by melting and mixing polylactic acid, poly (adipic acid) / butylene terephthalate, plasticized starch, inorganic filler, an anti-dripping agent, a lubricant, an antioxidant and a chain extender; the flame-retardant biodegradable plastic with the advantages of good compatibility, good temperature resistance, good toughness, good flame-retardant effect and the like is obtained by melting and mixing the raw materials in the specific formula through specific process steps, a feeding sequence and the processing temperature of each area of a double-screw extruder in the melting processing process. The flame-retardant biodegradable plastic prepared in the invention is used as a raw material, and the prepared flame-retardant biodegradable injection molding product has good flame retardance and environmental protection property, can effectively reduce the risk of fire, and provides a healthier and more comfortable living environment for users.

The invention relates to the technical field of flame-retardant materials, in particular to a halogen-free low-smoke flame-retardant material and a preparation process thereof. The halogen-free low-smoke flame-retardant material is prepared from the following raw materials: an ethylene-vinyl acetate copolymer, linear low-density polyethylene, maleic anhydride grafted modified polyethylene, a composite flame retardant, magnesium hydroxide, a synergistic flame retardant, an interface modifier and the like. The composite flame retardant is prepared from a sulfydryl-containing silane coupling agent, aluminum hydroxide and vinyl acetate. A composite flame retardant is prepared from a mercapto silane coupling agent, aluminum hydroxide and vinyl acetate as raw materials, the composite flame retardant is introduced into a material system, the dispersity and compatibility of inorganic filler in a polymer group are improved, a more continuous cross-linked network structure is formed, high-speed dry mixing, melt mixing and extrusion molding by a double-shaft eccentric rotor extruder are adopted, and the flame-retardant composite material is prepared. The processability of the material and the quality of a final product are improved, and the flame retardant property of the material is improved through the synergistic effect of the synergistic flame retardant.

The invention belongs to the technical field of nylon 66, and particularly relates to a production method of 8-shaped nylon 66 hollow fibers. The 8-shaped nylon 66 hollow fiber is prepared from four symmetrical C-shaped spinneret orifices, and the 8-shaped nylon 66 hollow fiber is obtained through nylon 66 slice solid-phase drying tackifying, melting, mixing, metering, spinning, cooling forming, oiling, stretching forming and winding forming. The breaking strength of the produced fiber is 2.8-3.1 cN.dtex-1, the elongation at break is 40-55%, the dry heat shrinkage rate is 3.5-4.5%, the hollow regularity is good, various physical indexes meet the requirements of customers, and the new market requirements are met.

The invention provides a high-wear-resistance and low-dilution gas shielded welding wire and a preparation method thereof, and belongs to the technical field of welding wire manufacturing. The welding wire consists of the following raw materials in parts by weight: 45-52 parts of iron; 18-22 parts by weight of an electrolytic nickel plate; 6-8 parts by weight of high-purity molybdenum powder; 4-6 parts by weight of nano tungsten powder; 3-4.5 parts by weight of a vanadium nitride alloy; 1.2 to 1.8 parts by weight of a niobium-iron alloy; 0.8-1.5 parts by weight of aluminum magnesium alloy powder; 0.3 to 0.6 part by weight of lanthanum cerium mixed rare earth; 0.15 to 0.25 part by weight of ferroboron alloy; 0.5 to 0.8 part by weight of metal silicon powder; 0.2 to 0.4 part by weight of a magnesium-calcium alloy; and 0.1-0.3 part by weight of titanium hydride powder. The hard framework is formed through gradient distribution of carbides such as molybdenum, tungsten and vanadium, the wear-resisting life is remarkably prolonged, melting mixing of base metal is reduced through the nickel-based alloy, the consistency of deposited metal components is ensured, free hydrogen is fixed through hydrogen trap phases such as titanium and niobium, and a moisture absorption path is blocked in combination with a surface passivation film.

The invention discloses a supercritical foaming PHA / PBAT composite material as well as a preparation method and application thereof. The composite material comprises the following components in parts by weight: 60-90 parts of polyhydroxyalkanoate; 10 to 40 parts of poly (adipic acid) / butylene terephthalate; 0.5 to 2.0 parts of a chain extender; 0.2 to 0.8 part of a self-assembly nucleating agent; and 0.1 to 0.5 part of an anti-hydrolysis agent. The preparation method comprises the following steps: mixing the components, melting, mixing and extruding, carrying out underwater pelletizing to obtain modified particles, drying, and carrying out supercritical foaming to obtain the foaming material. The obtained foaming material is bonded with beads through a steam forming technology, the degradable thin-wall plastic cup with the heat insulation performance is prepared, and the problem that in the foaming process of an existing material, phase separation is likely to happen, the cell density is low, and the product particle size is large, so that the thin-wall plastic cup is difficult to form is solved.

The invention discloses a high-toughness PPR pipe machining device which comprises an extrusion system, a pulsation mixing system, a melt online monitoring device, a sizing cooling system, a traction device and a winding device. The extrusion system is used for melting and conveying raw materials, and the pulsation mixing system is used for deeply mixing a melt by utilizing a periodic disturbance structure, so that a toughening agent and a copolymerization component are more uniformly dispersed in the melt. The melt on-line monitoring device can detect the temperature, pressure and dispersity of the melt in real time, so that the extrusion process is monitorable. The sizing cooling system adopts a subsection cooling mode of rapid cooling, constant-temperature slow release and low-temperature shaping, and stable shape control is achieved through vacuum sizing. The traction device and the winding device are used for keeping the production rhythm stable and achieving continuous winding of the formed pipe. According to the invention, the melt mixing quality can be improved, the cooling internal stress is reduced, and the toughness and dimensional stability of the PPR pipe are improved.

The invention discloses a flame-retardant starch-based biomass composite material and a preparation method thereof. The flame-retardant starch-based biomass composite material comprises starch and N-methylmorpholine-N-oxide, and can also comprise biomass fibers, a biodegradable synthetic polymer, ammonium polyphosphate and pentaerythritol. The mass ratio of the starch to the N-methylmorpholine-N-oxide to the ammonium polyphosphate to the pentaerythritol is (60-75): (20-30): (6-12): (2-5). The preparation method of the flame-retardant starch-based biomass composite material comprises the following steps: firstly, mixing part or all of starch with N-methylmorpholine-N-oxide liquid, and heating to prepare a thermoplastic starch material; and melting, mixing and extruding the thermoplastic starch material, ammonium polyphosphate, pentaerythritol, a reinforcing material and a biodegradable synthetic polymer by adopting a screw extruder. The flame-retardant starch-based biomass composite material disclosed by the invention is completely biodegradable, excellent in mechanical property and flame-retardant property, and the preparation method is simple and convenient.

The invention relates to a corrosion-resistant polypropylene modified plastic and a preparation method thereof, and belongs to the technical field of polypropylene plastic modification. The modified plastic is prepared from isotactic polypropylene, exfoliated montmorillonite, polyvinylidene fluoride powder, anhydride grafted polypropylene, a beta-crystal nucleating agent, diethyl aluminum chloride, peroxide, hindered phenol, phosphite ester and N, N-distearoyl hydroxylamine. The preparation method comprises the steps of low-shear melting and blending, high-shear supercritical COviscosity reduction, vacuum exhaust, bidirectional orientation, infrared local crosslinking, co-extrusion cooling and the like. The obtained material is excellent in tensile strength, elongation at break, low-temperature impact strength, strong acid corrosion resistance and the like.

The present invention provides a cellulose nanofiber-containing molten mixture excellent in interfacial adhesion with a resin and having high dispersibility in the resin; and a resin composition capable of having, in a molded or formed product thereof, excellent tensile stress at yield and Charpy impact strength while maintaining sufficient mechanical properties. The molten mixture contains a mixture containing a cellulose nanofiber and a solvent; and 0.05 to 1 part by mass of an aqueous polyolefin resin dispersion based on 1 part by mass of the cellulose nanofiber.

The invention relates to the technical field of high polymer materials, and discloses a preparation method of a modified master batch degradable material and application of the modified master batch degradable material in a packaging lunch box, and the modified master batch degradable material comprises the following components by mass: 75.0-93.8 parts of poly (butylene succinate); 5.0 to 20.0 parts of aliphatic series-aromatic copolyester; 1.0 to 4.0 parts of 1, 1 '-methylenebis-4, 1-phenylene-bismaleimide, and 1.0 to 4.0 parts of 1, 1'-methylenebis-4, 1-phenylene-bismaleimide; 0.5 to 2.0 parts of talcum powder; the method comprises the following steps: mixing dried poly (butylene succinate), aliphatic-aromatic copolyester, bismaleimide and talcum powder, performing reactive extrusion and melt mixing through a twin-screw extruder, and then cooling, pelletizing and drying the extrudate. Through specific components and a reactive extrusion process, a dynamic cross-linked network is formed by utilizing a Diels-Alder reaction, and the modified master batch degradable material of which the comprehensive mechanical property and the heat resistance are remarkably improved is prepared.

The invention discloses a preparation method of a mute tube core layer and a mute tube. The preparation method comprises the following steps: step 01, adding 15-55 parts by weight of polypropylene resin, 0.5-10 parts by weight of a coupling agent, 0.5-5 parts by weight of a lubricant, 0.05-1 part by weight of an antioxidant and 0.1-3 parts by weight of other additives into a twin-screw extruder from a main feeding port of the twin-screw extruder, and melting and mixing to form an intermediate melt; 02, 45-85 parts by weight of barium sulfate is added into a double-screw extruder through at least two side feeding ports of the double-screw extruder, the barium sulfate and the intermediate melt are subjected to melt blending, and a blended melt is formed; and step 03, extruding the blended melt by a twin-screw extruder, and sequentially passing through a melt pump and a pipeline core mold to form the pipe core of the mute pipe. According to the preparation method, the filling proportion of barium sulfate is increased to 70% or above, the material density is larger than 2.4 g / cm < 3 >, and the noise test of a drainage pipe system of the mute pipe prepared through the preparation method is smaller than 20 dB.

The invention discloses a preparation method of a low-dielectric-constant and high-heat-resistance LCP composite material for communication equipment. The preparation method sequentially comprises the following steps: S1, preparing the following raw materials in parts by mass: 50-80 parts of a liquid crystal polymer, 1-10 parts of glass fibers, 10-20 parts of inorganic fibers, 0-2 parts of a surface treating agent and 0.5-2 parts of a processing aid; S2, treating the surfaces of the inorganic fibers by adopting the surface treating agent; s3, mixing the liquid crystal polymer and the processing aid in a rotary mixer in proportion, and feeding from a main feed opening of the double-screw extruder; the preparation method comprises the following steps: mixing glass fibers and inorganic fibers according to a certain adding ratio by a mixer, feeding from a side feeding port of an extruder by a screw feeder, and carrying out melt mixing extrusion granulation. According to the invention, the defect that the LCP is easy to bubble after being involved in water vapor is overcome, the use temperature of the material is increased, and the application range of the LCP in a low-dielectric material in mobile phone components is widened.

The invention discloses a degradable bamboo-plastic composite food packaging film as well as a preparation method and application thereof, and belongs to the technical field of packaging film materials. The preparation method of the degradable bamboo-plastic composite food packaging film comprises the following steps: (1) mixing silanization modified bamboo powder, poly (butylene adipate-co-terephthalate) and polycaprolactone, and then carrying out melt mixing granulation treatment to obtain bamboo-plastic mixed master batches; and (2) carrying out film blowing treatment on the bamboo-plastic mixed master batch to obtain the degradable bamboo-plastic composite food packaging film. The degradable bamboo-plastic composite food packaging film prepared by the invention has excellent mechanical property and barrier property, also has antibacterial property, can be used for packaging fresh meat products or fruits and vegetables, is favorable for realizing high-valued application in the field of food, and assists in high-quality development of bamboo instead of plastic in the field of food packaging film products.

The invention relates to a semi-solid lithium battery diaphragm integrated with a sensing function and a preparation method thereof, the diaphragm is composed of a polymer matrix, lithium salts, a nano filler and at least one micro sensor, the polymer matrix comprises PEO, PAN, PVDF, PVA, PMMA and the like, the lithium salts comprise LiTFSI, LiPF6, LiBF4 and LiFSI, and the nano filler comprises graphene oxide, SiO2, MWCNTs, ZnO, Al2O3 and the like. The integration of the microsensor enables the diaphragm to provide critical battery state information, thereby enhancing the performance of the battery management system. The preparation method of the diaphragm comprises a solvent casting method, a melt mixing method and the like, and post-treatment steps such as drying and cutting.

The invention belongs to the technical field of glass materials, and particularly relates to black high-hardness heat-resistant microcrystalline glass ware and a preparation method thereof. Silicon dioxide, sodium oxide, aluminum oxide, potassium oxide, boric oxide, magnesium oxide, calcium oxide, zinc oxide, sodium fluosilicate, iron oxide, manganese oxide, fluorite, lithium oxide, metal manganese coated with silicon dioxide and schorlite are used as raw materials, and the black high-hardness heat-resistant microcrystalline glass ware is prepared through the processes of high-temperature melting and mixing, compression molding, annealing and tempering. The black high-hardness heat-resistant microcrystalline glass ware is excellent in performance, high in hardness and good in heat resistance, and has potential market value.

The present invention discloses a fluorocarbon powder coating and a preparation method thereof, belonging to the technical field of powder coatings, which comprises the following steps: premixing methyl methacrylate, 2-hydroxyethyl methacrylate, 1H,1H,2H,2H-hexafluorobutyl methacrylate and methyl p-coumarate to obtain a premixed solution; transferring the premixed solution to a reaction kettle, heating up, adding an initiator, carrying out a reaction, filtering, and drying to obtain a modified acrylic resin, then carrying out melt mixing and extrusion to obtain material A; putting PVDF fluorocarbon resin and a filler into a reaction kettle, heating up and stirring to obtain material B, adding material A and modified PMMA, stirring, cooling and pressing into tablets to obtain the powder coating. The fluorocarbon powder coating of the present invention can maintain the advantage of high weather resistance, while also improving the internal compatibility and anti-ultraviolet performance, and enhancing the internal bonding effect of the double-layer powder body.

The invention discloses a flame-retardant color master batch and a preparation process thereof, and belongs to the technical field of high polymer materials, the flame-retardant color master batch comprises the following raw materials by weight: 65-90 parts of carrier resin, 25-45 parts of modified magnesium hydroxide, 15-45 parts of a pigment, 1-5 parts of a dispersant, and 0.05-1 part of an antioxidant. The preparation method comprises the following steps: S1, weighing the carrier resin, the modified magnesium hydroxide, the pigment, the dispersing agent and the antioxidant in parts by weight, adding the carrier resin, the modified magnesium hydroxide, the pigment, the dispersing agent and the antioxidant into a high-speed mixer, and uniformly mixing to obtain a mixture; and S2, transferring the mixture into a twin-screw extruder, and carrying out melt mixing, extrusion granulation and drying to obtain the flame-retardant color master batch. The prepared flame-retardant color master batch has excellent flame-retardant property and mechanical property, and is stable and durable; meanwhile, raw materials for preparing the flame-retardant color master batch are easy to obtain, the processing process is simple, and large-scale popularization can be realized.

The invention relates to the technical field of spinning preparation, and discloses cool color master batch gradient blended spinning and a preparation method thereof.The preparation method comprises the steps that the proportion of cool master batches and color master batches is obtained, and the cool master batches and the color master batches are prepared; the preparation method comprises the following steps: performing nano coating treatment on a cool master batch and a color master batch to obtain an optimal synergistic ratio of the cool master batch and the color master batch, dynamically adjusting a blending ratio and a process path, performing programming regulation and control on a cool degree and color shade to execute a partitioned melting and mixing strategy, and performing staged functional component mixing; a gradient color distribution strategy is executed, material distribution in the fibers is adjusted, annular airflow is adopted for cooling, the cooling speed and the cooling flow direction are controlled, and the melt is rapidly shaped; comparing the actual parameters of the generated fiber structure with the target performance demand parameters, and judging whether the color distribution uniformity, the cool feeling performance index and the structural integrity meet preset standards or not; according to the scheme, the diversified requirements of the market for cool feeling and color can be better met.

A process for preparing a fiber reinforced thermoplastic is disclosed. The process includes melting a first thermoplastic and a second thermoplastic in a melting zone of a twin-screw processor, feeding at least one continuous fiber downstream of the melting zone into a melted mixture of the first thermoplastic and the second thermoplastic, incorporating the at least one continuous fiber into the melted mixture in a mixing zone, the mixing zone including at least one wave element having a continuous outer surface in the form of a helical wave, and obtaining the fiber reinforced thermoplastic from the twin screw processor. Further, a fiber reinforced thermoplastic composition prepared by an extrusion process the composition having a density between 1.3 g / cc to 1.7 g / cc and a flexural modulus of at least 4000 MPa is disclosed.

The present invention relates to a high-solid content epoxy molding compound composition, a high-solid content epoxy molding compound and a preparation method and application thereof, wherein the composition comprises the following raw materials in percentage by mass: 88-92% filler, 3-7% epoxy resin, 3-5% phenolic resin, 0.05-0.2% accelerator, 0.1-0.5% stress release agent, 0.1-0.4% colorant, and 0.2-0.4% release agent. The preparation method is as follows: S1 melts and mixes the filler, epoxy resin, stress release agent, and colorant, and obtains a mixture A after crushing; S2 melts and mixes the filler, phenolic resin, accelerator, and release agent, and obtains a mixture B after crushing; S3 melts and mixes the mixture A and the mixture B, and obtains a high-solid content epoxy molding compound after crushing. Compared with the prior art, the epoxy molding compound prepared by the present invention has a high solid content, meets the V-0 flame retardant grade, has a high thermal conductivity, a low thermal expansion coefficient, a low water absorption rate, and good insulation.

The invention relates to a low-color-difference color master batch and a corresponding polyolefin product. The color master batch is mainly suitable for coloring polyethylene and polypropylene films or injection molded parts. According to the invention, epoxidized poly-alpha-olefin with a determined chemical structure is selected as a dispersing agent, and the epoxidized poly-alpha-olefin has an epoxy group with relatively high polarity and a non-polar long carbon chain, and has dispersing and lubricating effects, so that the compatibility of the carrier resin and the polar coloring agent is improved, and the carrier resin and the polar coloring agent are melted and mixed more sufficiently; the color master batch has the advantages of lower color difference, more uniform coloring, more stable coloring performance, bright color and no flow lines in the application of coloring polyolefin products, and meanwhile, the yellowing of the polyolefin products at high temperature is avoided.

The invention belongs to the technical field of non-woven processing, and discloses a melt-blowing spinning die head, a hollow crimped fiber-based flocculus prepared by the melt-blowing spinning die head and a preparation method, the melt-blowing spinning die head comprises a spinneret plate and two gas plates, and the two gas plates are arranged on the two sides of the lower portion of the spinneret plate respectively; the included angles between the planes of the inner sides of the two gas plates and the surfaces of the opposite spinneret plates are respectively recorded as alpha and beta, and the horizontal distances between the outlet ends of the two gas plates and the center of the spinneret orifice are respectively recorded as a and b; alpha ranges from 10 degrees to 45 degrees, beta ranges from 45 degrees to 89 degrees, and alpha is not equal to beta; b is equal to 1.1 a-3a; the preparation method of the hollow crimped fiber-based flocculus comprises the following steps: melt-blowing raw materials are fused and mixed by a screw extruder and then are fed into a melt-blowing metering pump, metered melt is sprayed out by a melt-blowing spinning die head, and the hollow crimped fiber-based flocculus is collected after being stretched by air flow asymmetrically distributed on the two sides and cooled and solidified. The warm keeping performance of the flocculus can be improved while the light and thin characteristics are kept.

The present invention relates to a low-color-difference masterbatch and corresponding polyolefin products. The masterbatch is primarily suitable for coloring polyethylene and polypropylene films or injection-molded parts. The present invention uses an epoxidized polyalphaolefin (PAO) with a defined chemical structure as a dispersant. The epoxidized PAO has highly polar epoxy groups and non-polar long carbon chains, providing both dispersing and lubricating properties. This improves the compatibility of the carrier resin and the polar colorant, allowing for more complete melt mixing of the two. This results in lower color difference, more uniform coloring, more stable coloring performance, and bright, streaky-free color when used to color polyolefin products. Furthermore, it prevents yellowing of the polyolefin products at high temperatures.

The forming method comprises the following steps: providing a polypropylene base material and an additive, and carrying out pre-drying treatment on the polypropylene base material and the additive according to a preset weight percentage; melting and mixing the pretreated polypropylene base material and an additive in a range of 190-220 DEG C by using a twin-screw extruder, carrying out extrusion molding by using a circular mold, rapidly cooling the extruded thermoplastic pipe to room temperature by using a continuous water cooling device, and sizing by using a sizing roller way; the cooled pipe is moderately stretched in the longitudinal direction and the transverse direction through a two-way stretching device, and online detection is conducted through detection equipment; through collaborative optimization of the materials and the process, the produced weather-resistant photovoltaic pipe has excellent ultraviolet resistance, oxidation resistance and mechanical properties and is suitable for a photovoltaic system environment with high requirements, and high-quality preparation of the weather-resistant photovoltaic pipe is achieved.