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CN-122013341-A - Stretch-proofing ultra-high molecular weight polyethylene fiber and production equipment thereof

CN122013341ACN 122013341 ACN122013341 ACN 122013341ACN-122013341-A

Abstract

The invention relates to the technical field of preparation of ultra-high molecular weight polyethylene fibers and discloses an anti-stretching ultra-high molecular weight polyethylene fiber and production equipment thereof, wherein the ultra-high molecular weight polyethylene fiber comprises 92.1-96.0 parts of matrix materials, 3.3-6.0 parts of core composite lubricant, a three-stage core-shell structure, a nano sulfur dioxide carrier, an amino functional ionic liquid lubricating layer and an amino carbon nano tube reinforcing layer, wherein the total size of the three-stage core-shell structure is 50+/-5 nm, functional additives comprise 0.9-1.9 parts of gradient regulation additives and 0.1-0.3 parts of antioxidants, and under the action of the core composite lubricant, the core composite lubricant is matched with a targeted supplementing technology and a pulsating pressure field, so that the core lubricant is high in the ultra-high molecular weight polyethylene melt, the surface layer lubricant is low in shape, the lubricating degree and the fiber strength are considered in the preparation of the ultra-high molecular weight polyethylene fiber, the preparation difficulty is effectively reduced, and the anti-stretching performance of the fiber is conveniently improved.

Inventors

  • DU HUA
  • HUANG JINGYU

Assignees

  • 湖北昱泓高新材料科技有限公司

Dates

Publication Date
20260512
Application Date
20260316

Claims (10)

  1. 1. A stretch-resistant ultra-high molecular weight polyethylene fiber comprising 92.1-96.0 Parts of matrix material, namely ultra-high molecular weight polyethylene; 3.3-6.0 parts of core composite lubricant, wherein the core composite lubricant is of a three-stage core-shell structure, and comprises a nano sulfur dioxide carrier, an amino functional ionic liquid lubricating layer and an amino carbon nano tube reinforcing layer from inside to outside in sequence, and the total size of the three-stage core-shell structure is 50+/-5 nm; 0.9-1.9 parts of gradient regulation auxiliary agent and 0.1-0.3 part of antioxidant; The preparation method of the stretch-resistant ultra-high molecular weight polyethylene fiber comprises the following steps: S1, preparing a core composite lubricant with a three-stage core-shell structure; S2, premixing a matrix material, 50% -60% of a core composite lubricant, a gradient control auxiliary agent and an antioxidant to obtain a premix; S3, feeding the premix into a first stage of a double-stage screw extruder, and mixing at a low temperature; S4, injecting the remaining 40% -50% of core composite lubricant into the second stage of the double-stage screw extruder through a lubricant directional supplementing assembly, and simultaneously applying a pulsating pressure field to perform high-temperature high-speed shearing to form a gradient distribution melt with high core concentration and low surface concentration; s5, extruding the ultra-high molecular weight polyethylene melt through a spinneret plate at the outlet of a double-stage screw extruder, and then stretching and shaping to form the ultra-high molecular weight polyethylene.
  2. 2. The stretch-proofing ultra-high molecular weight polyethylene fiber according to claim 1, wherein said nano sulfur dioxide carrier has a particle size of 30-40nm and a specific surface area 13.9 To 14.3 percent of the total mass of the core composite lubricant; the alkyl chain length of the amino functional ionic liquid is C12-C18, the anion is bistrifluoromethylsulfonyl, and the solubility parameter difference range of the amino functional ionic liquid and the ultra-high molecular weight polyethylene is The amino functional ionic liquid accounts for 74.6-77.8% of the total mass of the core composite lubricant; The length-diameter ratio of the aminated carbon nano tube is 50-100, and the amino content is Accounting for 4.8 to 8.3 percent of the total mass of the core composite lubricant.
  3. 3. The stretch-proofing ultra-high molecular weight polyethylene fiber according to claim 1, wherein the preparation process of the tertiary core-shell structure core composite lubricant is as follows: s11, placing nano sulfur dioxide in a vacuum oven, drying for 4 hours at 120 ℃, and removing surface adsorption water; s12, placing the dried nano sulfur dioxide into an atomic layer deposition reaction cavity, heating to 80-100 ℃, introducing an aminosilane precursor, and adsorbing for 10-15S; S13, introducing inert gas to purge for 30-40S, and removing unadsorbed aminosilane precursor; S14, simultaneously introducing an amino functional ionic liquid monomer and an amino carbon nano tube, and reacting for 20-25S; S15, repeating the steps S12-S14 for 3-5 times, and then drying in vacuum at 80 ℃ for 2 hours to obtain the three-stage core-shell structure core composite lubricant.
  4. 4. The ultra-high molecular weight polyethylene fiber of claim 1, wherein said ultra-high molecular weight polyethylene has a molecular weight of The grain diameter is 50-100 mu m; The gradient regulating auxiliary agent is polyolefin wax grafted nano calcium carbonate, wherein the particle size of the nano calcium carbonate is 10-20nm, the grafting rate of the polyolefin wax is 5-8%, and the solubility parameter difference range between the nano calcium carbonate and the ultra-high molecular weight polyethylene fiber is ; The antioxidant is hindered phenol antioxidant, specifically antioxidant 1010.
  5. 5. The production equipment of the stretch-proof ultra-high molecular weight polyethylene fiber according to any one of claims 1 to 4, wherein the production equipment comprises a double-step screw extruder, the double-step screw extruder comprises a first step of the screw extruder and a second step of the screw extruder, a first screw is arranged in the first step of the screw extruder and is used for carrying out low-temperature mixing on premix in the first step of the screw extruder, a feed-through component is arranged between the first step of the screw extruder and the second step of the screw extruder, a lubricant directional supplementing component is arranged in the feed-through component and is used for specifically injecting 40% -50% of core compound lubricant into a core in the second step of the screw extruder, and simultaneously, a pulsating pressure field is applied to the second step of the screw extruder, and the second step of the screw extruder is used for carrying out high-temperature high-speed shearing on materials entering the inside through the feed-through component to form gradient distribution of high concentration and low surface layer concentration of a core melt.
  6. 6. The apparatus for producing ultra-high molecular weight polyethylene fiber with stretching resistance according to claim 5, wherein a second screw is installed in the second stage of the screw extruder, a third screw is coaxially provided at the end of the second screw, the groove depth of the second screw becomes gradually shallower, and the groove density of the second screw becomes gradually higher.
  7. 7. The production equipment of the stretch-proofing ultra-high molecular weight polyethylene fiber according to claim 5, wherein a raw material feeding mechanism is arranged at the top of the first stage of the screw extruder and used for premixing a matrix material, 50% -60% of core composite lubricant, gradient regulation auxiliary agent and antioxidant and feeding the premix into the first stage of the screw extruder, a lubricant containing cavity is arranged at the top of the double-stage screw extruder and used for storing the remaining 40% -50% of core composite lubricant, and the lubricant is fed into the second stage of the screw extruder in a targeted manner through a lubricant directional feeding assembly.
  8. 8. The apparatus for producing ultra-high molecular weight polyethylene fiber with stretching resistance according to claim 5, wherein the lubricant directional supplementing and throwing component comprises a driven roller and a driving roller, the driven roller is rotationally connected to the inside of the lubricant containing cavity, the driving roller is fixedly connected to one end of the first screw far away from the second screw, the end part of the driving roller is fixedly connected with a spiral sheet, the peripheral surfaces of the driven roller and the driving roller are supported with a throwing belt, a plurality of throwing openings are arranged in the throwing belt at equal intervals, and the number of the throwing openings is an odd number.
  9. 9. The apparatus for producing ultra-high molecular weight polyethylene fiber with stretching resistance according to claim 8, wherein the opening of the feed port faces the outer circumferential surface of the feed belt, the bulge of the feed port faces the inner circumferential surface of the feed belt, and when the driving roller drives the feed belt to rotate, the driving roller, the second screw and the third screw can form up-and-down reciprocating vibration through pushing action of the bulge of each feed port, so that a pulsating pressure field is formed inside the second stage of the screw extruder.
  10. 10. The apparatus for producing ultra-high molecular weight polyethylene fiber resistant to stretching according to claim 5, wherein the feeding component comprises a separation structure, a discharging cavity is coaxially arranged in the separation structure, an opening of the discharging cavity faces to a second stage of the screw extruder, the discharging cavity is gradually expanded, a plurality of feeding channels are arranged on the side of the discharging cavity in an annular array, the feeding channels are used for feeding materials in the first stage of the screw extruder into the second stage of the screw extruder, and a supporting mechanism is mounted on the back of the separation structure and used for supporting the driving roller and the first screw.

Description

Stretch-proofing ultra-high molecular weight polyethylene fiber and production equipment thereof Technical Field The invention relates to the technical field of preparation of ultra-high molecular weight polyethylene fibers, in particular to a stretch-proof ultra-high molecular weight polyethylene fiber and production equipment thereof. Background The ultra-high molecular weight polyethylene fiber, UHMWPEF for short, is also called as high-strength high-modulus polyethylene fiber, and is a fiber spun from polyethylene with molecular weight of 100 ten thousand to 500 ten thousand. The fiber has the highest specific strength and specific modulus in the world, the specific strength is more than ten times of that of the steel wire with the same section, and the specific modulus is only inferior to that of the superfine carbon fiber. The density is low, the water can float on the water surface, and the water has the characteristics of low elongation at break, large breaking work, outstanding impact resistance and cutting resistance, ultraviolet radiation resistance, chemical corrosion resistance, good wear resistance and the like. The ultra-high molecular weight polyethylene fiber is generally prepared by adopting a solution spinning method, a melt spinning method or a wet spinning method, and has wide application in the fields of military, aerospace, medical treatment, sports equipment and the like. However, the ultra-high molecular weight melt has extremely high viscosity, which can cause the problems of difficult extrusion processing, high energy consumption, poor fiber forming quality, low breaking strength and the like when preparing fibers due to strong shearing force received by poor flowability, and in order to adjust the flowability of the ultra-high molecular weight polyethylene melt in the prior art, the lubricant is usually selected to be put into the fiber, the excessive lubricant can influence the fiber strength, insufficient addition or uneven distribution is caused to have agglomeration, the fluidity is difficult to meet the requirement, the fiber production is still influenced, and the key contradiction that the requirement for high fluidity and the retention of the fiber strength are difficult to be compatible in the processing of the ultra-high molecular weight polyethylene fiber exists. Disclosure of Invention The invention aims to solve the technical problems that the prior art generally adjusts the fluidity of an ultra-high molecular weight polyethylene melt by adding a lubricant, and the problems that the lubricant is too much to reduce strength, insufficient or aggregated and hardly satisfies the fluidity are solved, so that the key contradiction that the processing high fluidity requirement and the retention of the fiber strength are difficult to be considered is formed, and therefore, the ultra-high molecular weight polyethylene fiber with stretching resistance and the production equipment thereof are provided. In order to achieve the aim, the application adopts the following technical scheme that the stretch-resistant ultra-high molecular weight polyethylene fiber comprises a matrix material, namely 92.1-96.0 parts of ultra-high molecular weight polyethylene; 3.3-6.0 parts of core composite lubricant, wherein the core composite lubricant is of a three-stage core-shell structure, and comprises a nano sulfur dioxide carrier, an amino functional ionic liquid lubricating layer and an amino carbon nano tube reinforcing layer from inside to outside in sequence, and the total size of the three-stage core-shell structure is 50+/-5 nm; 0.9-1.9 parts of gradient regulation auxiliary agent and 0.1-0.3 part of antioxidant; The preparation method of the stretch-resistant ultra-high molecular weight polyethylene fiber comprises the following steps: S1, preparing a core composite lubricant with a three-stage core-shell structure; S2, premixing a matrix material, 50% -60% of a core composite lubricant, a gradient control auxiliary agent and an antioxidant to obtain a premix; S3, feeding the premix into a first stage of a double-stage screw extruder, and mixing at a low temperature; S4, injecting the remaining 40% -50% of core composite lubricant into the second stage of the double-stage screw extruder through a lubricant directional supplementing assembly, and simultaneously applying a pulsating pressure field to perform high-temperature high-speed shearing to form a gradient distribution melt with high core concentration and low surface concentration; s5, extruding the ultra-high molecular weight polyethylene melt through a spinneret plate at the outlet of a double-stage screw extruder, and then stretching and shaping to form the ultra-high molecular weight polyethylene The particle diameter of the nano sulfur dioxide carrier is 30-40nm, and the specific surface area13.9 To 14.3 percent of the total mass of the core composite lubricant. Preferably, the alkyl chain length of the amino functional ionic