68results about How to "Improve plasticizing effect" patented technology

The invention belongs to the field of polymeric membranes. The invention relates to a BOPLA (biaxially-oriented polylactic acid) film with high stretching ratio and a preparation method thereof. The packaging film comprises the following raw materials in parts by weight: 80-90 parts of PLA; 10 to 20 parts of PPC-P (Polypropylene Chloride-P); 10-15 parts of a plasticizer; 3.0 to 5.0 parts of a chain extender; 0.3 to 0.5 part of an antioxidant; 0.5 to 1.0 part of a lubricant; 0.1 to 0.3 part of an anti-hydrolysis agent; wherein the total mass of the PLA and the PPC-P is 100 parts; the preparation method comprises the following steps: mixing, extruding and plasticizing the raw materials according to the formula, and carrying out an asynchronous two-way stretching process, heat setting, traction, slitting and rolling. According to the present invention, the defects of mechanical property degradation and poor optical property of the PLA under the high stretching rate in the prior art can be effectively solved, and the great application potential is provided.

The invention discloses an aconitic acid-based polyester plasticizer and a preparation method thereof, and relates to the technical field of plasticizer composite materials, the molecular structure of the plasticizer is as follows: # imgabs0 #, R1 and R2 are independently selected from alkyl groups containing 1-4 carbon atoms, and the number n of structural units is 1-20. The aconitic acid-based polyester plasticizer provided by the technical scheme of the invention avoids the cross-linking phenomenon in the process of preparing a polyester material from tricarboxylic acid, so that the aconitic acid-based polyester plasticizer has good flowability and plastification performance when plastifying a plastic matrix, meanwhile, the reaction raw materials are derived from biomass, the preparation process conditions are mild, the equipment requirement is low, and the yield is high.

The invention discloses a stretching and mixing element for enhancing heat transfer and a screw extruder, the stretching and mixing element for enhancing heat transfer comprises a sleeve, first beads and second beads, the first beads and the second beads are both fixed on the outer wall of the sleeve, and the first beads and the second beads are alternately arranged; the first protruding edges are evenly distributed relative to the circumference of the axis of the sleeve, a first material flow channel is formed by every two adjacent first protruding edges and the outer wall of the sleeve, and third protruding edges are arranged on the first material flow channels. The second protruding edges are evenly distributed relative to the circumference of the axis of the sleeve, two adjacent second protruding edges and the outer wall of the sleeve form a second material flow channel communicated with the first material flow channel, and the side face contour of each second protruding edge is formed by twisting a sine curve by a certain angle in the circumferential direction. According to the invention, the local melt flow direction is changed to generate convective heat transfer, the dispersion distribution mixing effect is enhanced, local temperature rise caused by strong shearing is favorably diffused, and the applicability of the device in materials and processing equipment is widened.

The invention discloses an environment-friendly macromolecular modifier PVC (polyvinyl chloride) composition, and belongs to the technical field of polyvinyl chloride materials. The composition comprises the following components in parts by weight: 100 parts of PVC, 1-50 parts of a polycarbonate toughening modifier and 0-30 parts of an auxiliary agent. The polycarbonate toughening modifier with a certain polymerization degree is used as the modifier of the PVC material, the plasticity, toughness, impact resistance and other properties of PVC can be obviously improved, the polycarbonate toughening modifier is a macromolecular polymer and cannot be separated out in the use process, the safety of the PVC material is improved, and the service life of the PVC material is prolonged.

The invention discloses a preparation method of polylactic acid fibers for medical and sanitary materials, and relates to the technical field of polylactic acid fibers. Nano-crystalline cellulose, nano-graphite particles and polylactic acid are blended and crosslinked, the mechanical property of a matrix is enhanced, the antibacterial property is achieved, fibers are prepared through spinning, supercritical carbon dioxide treatment is conducted for the first time, the nano-graphite particles can play a role of a nucleating agent, polylactic acid is promoted to form fine and uniform crystals, and the mechanical property of the matrix is improved. Carbon dioxide is effectively wrapped in the foaming process, a micropore structure is formed in the fiber, the mechanical property of a matrix is enhanced, then secondary supercritical carbon dioxide treatment is conducted, the nano-silver is loaded into the matrix through supercritical fluid, the antibacterial property and the mechanical property are further improved, then the nano-silver is soaked in a silicate solution, dehydration is conducted, and the nano-silver fiber is obtained. A silica gel layer is formed on the surface of the fiber, so that the mechanical property and the antibacterial property of a matrix are enhanced.

The invention discloses a halogen-free transparent thermoplastic elastomer material as well as a preparation method and application thereof, and relates to the technical field of high polymer materials. The thermoplastic elastomer material comprises a styrene block copolymer, LLDPE (Linear Low Density Polyethylene), an olefin copolymer elastomer, a rubber plasticizer and a lubricant; the olefin copolymer elastomer is an ethylene-vinyl acetate copolymer, and the VA content is greater than or equal to 25wt%. The thermoplastic elastomer material has proper shore hardness, relatively high tensile strength and dimensional stability; the adhesive can realize low-temperature hot welding (less than or equal to 100 DEG C) with a PVC material, and has relatively high bonding strength.

The invention relates to the technical field of lithium ion batteries, and provides a pole piece plasticizer for a lithium battery. The plasticizer provided by the invention has the advantages of good plasticizing effect, good flexibility improvement, simple preparation process and controllable structure, is a water-oil universal plasticizer, and can be applied to the plasticizing of positive pole pieces such as lithium nickel cobalt manganate, lithium iron manganese phosphate, lithium iron phosphate, lithium cobalt oxide and lithium manganate of a lithium battery; the plasticizer can be used for plasticizing negative pole pieces such as graphite, hard carbon, silicon monoxide / graphite mixture and the like, is a universal plasticizer, is wider in application range and better in effect compared with an existing plasticizer, and has a good application prospect and application value.

The present invention discloses an environmentally friendly rubber plasticizer and a preparation method and application thereof, and belongs to the field of polymer material processing. The preparation method of the rubber plasticizer provided by the present invention comprises mixing plant asphalt and sulfur, heating them for reaction, and then dehydrating them. The preparation method provided by the present invention can obtain an environmentally friendly rubber plasticizer product with relatively cheap raw materials, and the processing technology of the product is relatively simple, the equipment investment is relatively small, and it has a very broad application prospect. The present invention also provides a rubber plasticizer obtained by the above preparation method, and a reclaimed rubber whose preparation raw materials include the above rubber plasticizer.

The present invention relates to the field of thermoplastic polyimide materials, and discloses a thermoplastic polyimide composition and its application, thermoplastic polyimide preparation and its application. The composition comprises component A, component B and optional component C; component A is a thermoplastic polyimide resin having a structure shown in formula (1): wherein Ar is a residue of a diprimary amine monomer; Ar is selected from one or more of the following groups: x is 0.45-0.9; EG is a capping agent residue, selected from one of the following groups: the viscosity of the thermoplastic polyimide resin at 30°C is 0.35-0.55dL / g; component B is an imide oligomer; and component C is an additive. The thermoplastic polyimide composition has the characteristics of low extrusion temperature, high melt index and high heat resistance stability.

The invention provides a TPE blood bag membrane material and a preparation method thereof, and solves the technical problems that an existing PVC blood bag membrane material is not environmentally friendly, not resistant to radiation and sterilization, poor in air permeability and the like. The TPE blood bag membrane material is prepared from the following raw materials in percentage by mass: 20 to 50 percent of SEBS, 5 to 20 percent of plasticizer, 30 to 60 percent of POE and 5 to 20 percent of EVA, the preparation method of the TPE blood bag membrane material comprises the following steps: S1, weighing the raw material components in percentage by weight; s2, fully and uniformly mixing the raw material components weighed in the step S1 to obtain a mixture; s3, carrying out melt extrusion and granulation on the mixture weighed in the step S2 through a twin-screw extruder; the method can be widely applied to the technical fields of polymer materials and medical application.

The invention relates to a shading ultraviolet-proof tarpaulin material and a preparation method thereof, and belongs to the technical field of tarpaulin materials, and the shading ultraviolet-proof tarpaulin material is prepared by the following steps: combining thiazolopyridine dicarboxylic acid with gallic acid, and then grafting polypropylene glycol monomethyl ether to obtain a plasticizing material; phosphonitrilic chloride trimer is combined with the plasticizing material, and the flame-retardant plasticizing material is obtained; graphene oxide is combined with a flame-retardant plasticizing material, so that an anti-ultraviolet auxiliary agent is obtained; the preparation method comprises the following steps: mixing an anti-ultraviolet auxiliary agent and polyvinyl chloride, melting, plasticizing and extruding, coating the mixture on the upper and lower surfaces of base cloth through curtain coating, cooling, sizing and coiling to finally prepare the shading and anti-ultraviolet tarpaulin material. According to the technical scheme, after the phosphonitrilic chloride trimer is combined with the plasticizing material, the graphene oxide is combined, and the prepared anti-ultraviolet auxiliary agent is added into the polyvinyl chloride, so that the mechanical property and the anti-ultraviolet property of a polyvinyl chloride matrix are improved, the flame retardant property of the polyvinyl chloride matrix is also improved, and the comprehensive performance of the tarpaulin material is overall improved.

The invention discloses aminated tung oil-based polyvinyl alcohol, a preparation method and application of the aminated tung oil-based polyvinyl alcohol in PBAT (poly (butyleneadipate-co-terephthalate)), and the preparation method of a composite material comprises the following steps: performing alcoholysis on tung oil by using ethanol, and then adding diethylenetriamine to perform amination on the alcoholysis tung oil under the action of a catalyst cobalt (II) terephthalate to obtain aminated tung oil; uniformly mixing the aminated tung oil with polyvinyl alcohol, and reacting to obtain an aminated tung oil plasticized polyvinyl alcohol material; and mixing the plasticized polyvinyl alcohol material with PBAT, and carrying out melt extrusion to obtain the tung oil-based polyvinyl alcohol / PBAT composite material. According to the invention, aminated tung oil is utilized to plasticize polyvinyl alcohol, and by means of chemical grafting and physical hydrogen bonds, tung oil macromolecules can inhibit outward migration of a plasticizer, so that the internal plasticizing performance of polyvinyl alcohol is maintained. The aminated tung oil-based polyvinyl alcohol can also generate stable chemical bonds with PBAT, so that the compatibility of the aminated tung oil-based polyvinyl alcohol and PBAT is improved, and the mechanical effect of the composite material is improved.

The present invention addresses the problem of providing a polarizing plate capable of suppressing color unevenness and contrast fluctuation caused by water content, a method for manufacturing the polarizing plate, and a display device. This polarizing plate is provided with a first optical film, a polarizer, and a second optical film in this order, and is characterized in that the first optical film contains a polyester, and the second optical film contains a polyester (I), a polyester (II), and a cellulose acetate having a degree of substitution of an acetyl group within the range of 2.30-2.80.

The invention discloses a water-soluble polyvinyl alcohol film and a preparation method thereof, and belongs to the technical field of polyvinyl alcohol films, the preparation method comprises the following steps: 1, stirring and mixing a compound plasticizer and PVA resin powder, and standing after mixing to obtain a preprocessed PVA mixed resin raw material; 2, stirring and mixing the pre-processed PVA mixed resin raw material and an auxiliary agent to obtain a melt-processable polyvinyl alcohol composition; and 3, carrying out melt extrusion granulation and film blowing on the melt-processable polyvinyl alcohol composition to obtain the water-soluble polyvinyl alcohol film. According to the invention, the additive with an adsorption effect is used as an auxiliary agent, a step-by-step plasticizing method is adopted, PVA and the plasticizer are mixed in advance, then the auxiliary agent is added, and through the step-by-step plasticizing process, the PVA plasticizing effect is improved, film yellowing caused by too long hot working time of PVA is avoided, the thermal stability of the PVA composition during hot working is improved, and the opening property of a blown film is improved.

The utility model discloses a novel plastic particle base stock bin for silane crosslinking material production, and relates to the technical field of plastic particle storage bins. The device comprises a stock bin, the top of the stock bin is fixedly communicated with a feeding pipe and an air outlet pipe respectively, the bottom of the stock bin is fixedly communicated with a thickening pipe, the bottom of the thickening pipe is fixedly communicated with a discharging pipe, and a bin door is fixed to the outer wall of the stock bin through screws; the two pieces of visible glass are arranged on the outer wall of the stock bin and used for observing the condition in the stock bin; the two temperature sensors are arranged on the inner wall of the stock bin and used for detecting the internal temperature of the stock bin; and the hot-air blower is arranged on one side of the stock bin, and an air outlet of the hot-air blower communicates with an air inlet pipe. According to the utility model, people can conveniently know the material level condition in the stock bin, can heat and preserve heat of raw materials, and can filter iron tails, so that the product quality is improved, people can conveniently clean the stock bin, and the safety is improved.

The invention relates to a biodegradable polyester material as well as a preparation method and application thereof, and belongs to the technical field of compositions of high-molecular compounds. The biodegradable polyester material disclosed by the invention is prepared from the following components in parts by weight: 40 to 60 parts of biodegradable polyester, 30 to 45 parts of starch stearate, 5 to 15 parts of a plasticizer, 0.2 to 1.5 parts of an anhydride compound, 0.5 to 1.5 parts of an anti-hydrolysis agent and 0 to 2 parts of a processing aid, the biodegradable polyester is prepared from PBAT resin; the molar ratio of the structural units derived from terephthalic acid is greater than or equal to 49% based on the total molar weight of the structural units derived from terephthalic acid and adipic acid in the PBAT resin. The biodegradable polyester material has good mechanical properties and excellent damp-heat aging resistance.

The invention provides an extrusion screw for producing a PVC cast film and an extrusion device, and belongs to the technical field of extrudes.The extrusion screw comprises a screw body, the screw body comprises a feeding section, a compression homogenizing section, a plasticizing section and an extrusion section which are sequentially arranged in the axial direction of the screw body, first screw flights are distributed on the feeding section, the compression homogenizing section and the plasticizing section, and second screw flights are distributed on the extrusion section; the first screw flight is distributed on the feeding section, the second screw flight is distributed on the extrusion section, a barrier mixing head and a stirring mixing head are arranged on the extrusion section, the barrier mixing head is located between the first screw flight and the second screw flight, the feeding section, the plasticizing section and the extrusion section are all of an equal-diameter shaft structure, the diameter of the feeding section is smaller than that of the plasticizing section, and the compression homogenizing section is of a variable-diameter shaft structure. The diameter of the compression homogenizing section is gradually increased from one end close to the feeding section to one end close to the plasticizing section. The screw has the beneficial effects that the structural design of the screw is reasonable, the mixing and homogenizing effects of materials can be ensured, the materials cannot stay for a long time at high temperature, and meanwhile, the productivity efficiency is ensured.

The invention relates to a grain fiber-PVC (polyvinyl chloride) composite foamed sheet with a surface co-extrusion layer and a preparation method of the grain fiber-PVC composite foamed sheet. Comprising a middle foaming layer and a surface co-extrusion layer, and the middle foaming layer and the surface co-extrusion layer both comprise PVC resin and rice hull powder. The rare earth composite stabilizer is added, so that the environment-friendly function is achieved, the rare earth stabilizer further has the coupling, reinforcing and brightening functions in the PVC material, and in addition, the rare earth composite stabilizer can further adjust the decomposition temperature of the foaming agent and achieve the effects of toughening and capacity increasing; the foaming agent is prepared by compounding an AC foaming agent and an NC foaming agent, so that the extrusion rate can be increased, meanwhile, the dimensional deviation of the product is reduced, and the surface hardness can reach about Shore D hardness 80; the weight ratio of the rare earth compound stabilizer to the foaming agent to the foaming regulator is (1-5): (0.5-1.6): (3-9). Plasticization in the processing process can be promoted, and meanwhile, the mechanical property of the material is improved.

A tire tread rubber composite material based on high extraction resistance liquid rubber and a preparation method thereof. The present invention belongs to the field of rubber materials and their preparation. The purpose of the present invention is to solve the technical problems of poor extraction resistance and decreased mechanical properties of traditional plasticizers. The material of the present invention is prepared from olefin rubber, iron-based butyl-pentane liquid rubber, zinc oxide, plasticizer, sulfur, accelerator and antioxidant, and the olefin rubber is mixed with natural rubber, butadiene rubber, styrene-butadiene rubber and iron-based butyl-pentane rubber, and the molecular weight of the iron-based butyl-pentane liquid rubber is 0.5-5w, and the total content of vinyl side groups and propenyl side groups is 30-60%. The present invention introduces iron-based butyl-pentane liquid rubber into the rubber formula, while ensuring the processing performance of the rubber composite material, the extraction resistance rate is increased by 70%, and the mechanical properties of the rubber material are improved, the tensile properties are increased by about 10.34%, and the tear resistance is increased by about 11.54%.

The invention belongs to the technical field of PVC alloy materials, and provides a heat-resistant, easy-to-process and high-transparency PVC / MS alloy material as well as a preparation method and application thereof. The alloy material comprises PVC resin, MS resin, a heat stabilizer, a lubricant, a flexibilizer, an antioxidant and an anti-yellowing agent, the MS resin is dried and then smashed, the PVC resin and the stabilizer are stirred and mixed at a low speed and heated, the lubricant, the antioxidant and the anti-yellowing agent are added, stirred and mixed at a low speed and heated, then the flexibilizer and the smashed MS resin are added, stirred and mixed at a high speed and heated, and the alloy material is obtained. And finally, transferring the mixed material into a low-speed mixer, cooling, feeding the obtained dry mixture into a granulating device, and granulating to obtain the PVC / MS alloy material. According to the PVC / MS alloy material, the MS resin, the yellowing eliminating agent and the lubricant are blended, the light transmittance can reach 90.5%, the addition of the MS resin plays a very good plasticizing effect and a very good heat-resistant effect, the Vicat softening point temperature of PVC can be increased, the PVC / MS alloy material can have better temperature resistance, and the use occasion of the material can be expanded.

The invention relates to an amide compound and a preparation method and application thereof. The amide compound has the following structural general formula: # imgabs0 #; in the formula, R1 contains an alicyclic group of C5-C10; n1 is an integer from 9 to 15, and n2 is greater than or equal to 2. The amide compound can be added into a polymer as a plasticizer, so that the heat resistance of the polymer is improved, and the mechanical property of the polymer is improved.

The invention belongs to the technical field of implantation medical instruments, and relates to a low-migration high-transparency anti-adhesion medical PVC (polyvinyl chloride) paste as well as a preparation method and application thereof. The low-migration high-transparency anti-adhesion medical PVC paste comprises the following main components: 100 parts of anti-adhesion PVC resin powder, 60-100 parts of a plasticizer, 1-3 parts of a stabilizer, 0.4-0.7 part of a defoaming agent and 0.1-0.4 part of a rheological additive. The preparation method comprises the following steps: firstly, uniformly mixing the plasticizer, the stabilizer and the defoaming agent to obtain a mixture A; adding anti-adhesion PVC resin powder into the mixture A, and uniformly mixing to obtain a mixture B; and finally, adding a rheological additive into the mixture B, uniformly mixing, filtering to remove impurities, and fully and uniformly mixing in vacuum, so that the preparation method is simple and easy to operate. The paste is injected into a trachea cannula provided with a spring and is heated and cured to obtain a reinforced trachea cannula, so that the catheter can be endowed with excellent anti-adhesion and antibacterial properties, and the clinical infection risk is greatly reduced; the hydrophilic property is high, and the clinical user experience is improved.

The invention relates to the technical field of temperature controller shell injection molding equipment, and particularly discloses shell injection molding equipment for production of a refrigeration temperature controller of a refrigeration house, the shell injection molding equipment comprises a workbench, a placement groove is formed in the side surface of the workbench in a penetrating manner, and a storage basket is placed in the placement groove. In the process of melting and conveying plastic particles, as the diameter of the rotating rod is larger when the rotating rod is closer to the inserting plate, more plastic particles can be contained at the hopper end, the continuity and stability of subsequent injection molding are ensured, the situation that molten plastic is cut off is avoided, meanwhile, the plasticizing capacity is improved, and the service life of the plastic particles is prolonged. The large diameter of the rotating rod is beneficial to providing more heat and pressure, so that plastic is fused more effectively, the uniformity and quality of melt are improved, and moreover, the rotating rod with the large length-diameter ratio is also beneficial to reducing pressure flow and leakage flow and improving the plasticizing capacity, which means that the flow of the melt can be controlled more accurately, and the waste of materials is reduced.

The invention provides a processing method and device for a light-emitting carrier with a starry sky bright effect and a vehicle lamp. The processing method for the light-emitting carrier comprises the steps that a mold is in a mold closing state, and raw materials are added into an injection molding cavity from a hopper; rotating the screw body, heating the raw material, and screwing the raw material into one end, close to the discharge port, of the screw body to form a skin material; the screw body moves in the direction away from the discharge port, meanwhile, gas is introduced into the gas inlet, and a core material with bubbles is formed on the side, away from the discharge port, of the skin material; and the screw body moves towards the discharging opening, the skin material and the core material are sequentially pushed into the mold, and the skin material is filled with the core material. The injection molding method solves the problem that the existing injection molding method of the light-emitting carrier is inconvenient to display the babysbreath type three-dimensional suspension effect.

This invention discloses a screw element for stretch-based reinforced compounding and an extrusion system for a screw extruder. The screw element includes a sleeve with a bottom groove having an outer wall surface twisted by 180° to form a torsional plane. Adjacent bottom grooves have raised ribs, the helical direction of which is consistent with the bottom groove. The height of the raised ribs increases and then decreases helically along the axis of the sleeve, while the width of the raised ribs also increases and then decreases helically along the axis of the sleeve, causing the width of the bottom grooves to decrease and then increase helically. Furthermore, the change in the width of the raised ribs is positively correlated with the change in their height. This invention features unique bottom grooves and raised ribs; the channels formed by the bottom grooves and raised ribs provide stronger stretching action, and the stretching flow field is uniformly distributed in all directions, resulting in superior melting and plasticizing effects on materials.

The present application relates to the field of cables, and in particular to a high temperature resistant, soft, flame retardant polyvinyl chloride material and a preparation method thereof. The high temperature resistant, soft, flame retardant polyvinyl chloride material comprises, by weight, PVC resin, plasticizer system, magnesium aluminum zinc intercalated hydrotalcite, antioxidant, filler, flame retardant and lubricant; by using PVC resin, a relatively high number of plasticizers, magnesium aluminum zinc intercalated hydrotalcite with an interlayer structure, flame retardant, lubricant and antioxidant, the prepared high temperature resistant, soft, flame retardant polyvinyl chloride material has good thermal stability, flexibility, flame retardant properties and mechanical properties.

This utility model relates to the field of extruder screw technology and discloses a screw-separated double-barrier pin-type mixing structure, including a screw with screw ribs on its surface. The front section of the screw is configured as a feeding section, and the middle section of the screw ribs includes a main screw rib and a secondary screw rib. This utility model, through the separation-type double-screw rib design composed of the main and secondary screw ribs, allows the material to be fully tumbled to the B section after being heated and compressed in the A section. This process creates an effective separation effect, enhancing the plasticizing effect of the material and ensuring the uniformity of the molten material. By evenly arranging pins around the bottom diameter of the screw ribs, the material can be effectively stirred and mixed, further improving the mixing effect, especially when dealing with high-viscosity materials, improving the uniformity of mixing and ensuring the consistency of the final product quality.

The utility model discloses a high-mixing and high-efficiency injection molding screw rod and an injection molding machine. The injection molding screw rod comprises a mounting section, a blanking section, a separation section and a mixing section which are sequentially arranged in the conveying direction, the discharging section comprises a transition section and a conveying section, the discharging section is of a single-thread structure, and the thread pitch of the discharging section is kept unchanged; the bottom diameter of the transition section is gradually reduced, and the bottom diameter of the conveying section is kept unchanged. According to the high-mixing and high-efficiency injection molding screw provided by the utility model, the transition section is gradually reduced along the conveying direction, so that larger stress concentration caused by sudden change of the shaft diameter at the intersection of the mounting section and the blanking section is avoided, the risk that the position is twisted off is greatly reduced, and the anti-fatigue characteristic and the reliability of the screw are improved. Meanwhile, due to the existence of the transition section, the depth of the discharging groove can be properly increased, and the conveying capacity of raw materials of the discharging section is improved.

This invention proposes a screw barrel accessory for high-speed, high- and low-pressure blown film extrusion equipment, applicable to blown film extruders. The screw includes a feed end and a discharge end at its two ends. Along the axial direction from the feed end to the discharge end, the screw sequentially features equal-depth screw groove sections, wavy gradient screw groove sections, a diamond sorting area, another wavy screw groove section, and a four-in, four-out multi-channel structure. This invention optimizes material plasticization, dispersion, flowability, and pressure control through a combination of wavy screw grooves, a dense tooth structure, a diamond sorting area, and a through-hole structure. The wavy and gradient screw grooves utilize a special structure to perform multiple shearing and kneading operations on the material. Simultaneously, the orderly arrangement of functional sections and the reasonable axial segment dimensions ensure smooth and stable screw operation, making it suitable for long-term continuous operation in high-speed, high- and low-pressure blown film production lines. This reduces the defect rate, improves overall production efficiency and economic benefits, and the integrated structural design enhances the overall strength of the screw.

The invention belongs to the technical field of high polymer material modification, and relates to a high-elasticity and high-stability PVC (Polyvinyl Chloride) granule, a preparation method and application in a medical catheter. The granules are prepared from the following raw materials in parts by weight: 100 parts of PVC resin powder, 50-60 parts of a plasticizer, 5-10 parts of epoxidized soybean oil, 0.6-1.5 parts of a composite heat stabilizer, 0.4-6 parts of an elastomer, 0.4-0.8 part of a processing aid and 0.1-0.4 part of a lubricant, and the granules are obtained by pre-plasticizing the raw materials, performing melt extrusion through an extruder and performing granulation molding. A high-elasticity and high-stability medical catheter body can be obtained by carrying out melting secondary extrusion molding on the granules, a medical catheter product can be obtained by assembling the catheter body, and the medical catheter product comprises infusion, nursing or implantation intervention type medical catheters. The high-elasticity and high-stability PVC aggregate has excellent elasticity, tensile toughness, thermal stability and long-term stability, and can endow a catheter with excellent elasticity and stability when being applied to medical catheter products.