JP2026507416A - Cut-resistant fiber and method for producing same - Google Patents

Abstract

The present invention relates to a cut-resistant fiber and a method for producing the same. The method includes the steps of: surface-treating an inorganic fiber material to improve its affinity for a polyethylene substrate; mixing a narrow molecular weight distribution polyethylene obtained by polymerizing a single-site catalyst with the treated inorganic fiber material and a processing aid to form a blend; feeding the blend into a twin-screw extruder for melt blending and obtaining an undrawn molten fiber through a spinneret; drawing the undrawn molten fiber at a high magnification at a high temperature until the draw ratio exceeds 180 times and the inorganic fiber reaches a uniaxially oriented state; and cooling the cooled inorganic fiber at a high magnification to obtain a cut-resistant polyethylene composite fiber. Compared to the prior art, the present invention solves problems such as environmental pollution, high costs, and complicated steps associated with the conventional production of ultra-high molecular weight polyethylene fiber and its subsequent modification.
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Description

The present invention relates to the technical field of polymeric materials, and in particular to cut-resistant fibers and methods for producing the same.

With the rapid development of science and technology, demand for special fibers in the engineering industry is increasing. High-performance polyethylene fiber is lightweight, high-strength, has a long service life, and is characterized by its abrasion resistance, high strength, moisture resistance, and corrosion resistance. It is commonly used in towing ropes, load ropes, rescue ropes, cut-resistant gloves, etc. In recent years, the use of high-performance fibers has gradually increased in cut-resistant fields such as civilian and police cut-resistant gloves and military clothing. Demand for high-performance fibers with excellent cut resistance is also gradually increasing. High-performance polyethylene fiber's use in these fields is gradually expanding due to its low-cost raw materials and properties such as high strength and high elastic modulus.

Currently, the polyethylene spinning methods used in the cut-resistant field can be divided into three main types:

Class 1 includes methods disclosed in Chinese Patent CN200980146604, Chinese Patent CN201410264678, International Application Publication No. W02005/066401A1, and U.S. Patent US430577, among others. These methods involve first swelling and dissolving high-molecular-weight polyethylene in a solvent, then extruding it into polyethylene yarn. The yarn is then subjected to steps such as solvent extraction and drying to remove the solvent, and finally undergoes multi-stage drawing to obtain high-strength high-molecular-weight polyethylene fiber. This method produces ultra-high-molecular-weight polyethylene fiber products with high strength and high modulus. These products have excellent mechanical properties and excellent cut resistance, generally reaching the EN388-2 cut resistance level, making them the mainstream fiber material for current cut-resistant products. However, ultra-high-molecular-weight polyethylene fiber is difficult to process, the manufacturing process is complicated and expensive, and it is difficult to solve issues such as solvent evaporation and recovery during the manufacturing process, resulting in significant environmental impact. Furthermore, the cut resistance does not meet the high demands of products in the cut-resistant field.

The second category, primarily disclosed in patents such as CN106149085A, CN107326462A, and CN108315833A, includes further reinforced ultra-high molecular weight polyethylene spinning. The primary method involves blending nanomaterials and inorganic materials, such as graphene, nanosilica, carbon fiber, and glass fiber, into ultra-high molecular weight polyethylene raw materials and processing them through a spinning process to obtain highly cut-resistant textile products. While textile products produced using this method offer superior cut resistance to ultra-high molecular weight polyethylene fibers, the processing costs are extremely high and the process is challenging. It is particularly difficult to uniformly disperse nanoscale inorganic materials in a solvent without agglomeration and to disperse them uniformly in the textile product. This requires strict modification procedures, such as emulsification and grafting, for the inorganic and nanomaterials. Furthermore, it is also extremely difficult to recover and reuse solvents containing nano- and inorganic materials, resulting in extremely high waste solvent disposal costs.

Class 3 mainly includes methods disclosed in Chinese Patents CN201780040580.9, CN201880081866.6, CN201080007173.6, etc. These methods involve blending inorganic fibers and polyethylene fibers to produce abrasion-resistant textile products. After such textile products are processed into gloves or fabrics, the inorganic fibers tend to come off, which not only affects comfort but also requires relatively high blending costs.

The object of the present invention is to provide a cut-resistant fiber and a method for producing the same, which solves the problems described above, such as environmental pollution, high costs, and complicated steps that arise from the conventional production of ultra-high molecular weight polyethylene fibers and the modifications based on them.

The objectives of the present invention are achieved by the following technical means:

A first aspect of the present invention is
Step S1: surface-treating an inorganic fiber material to improve affinity of the inorganic fiber material to a polyethylene substrate;
Step S2: mixing the narrow molecular weight distribution polyethylene obtained by polymerizing a single-site catalyst, the inorganic fiber material treated in step S1, and a processing aid to form a blend material;
Step S3: feeding the blended material obtained in step S2 into a twin-screw extruder to melt-blend the material, and obtaining an undrawn fiber melt using a spinneret;
Step S4: drawing the undrawn molten fiber at a high draw ratio at a high temperature until the draw ratio exceeds 180 times and the inorganic fiber reaches a uniaxially oriented state, followed by cooling the inorganic fiber;
and step S5 of drawing the inorganic fibers cooled in step S4 again at a high temperature and at a multiple drawing ratio to obtain cut-resistant polyethylene composite fibers.

Furthermore, the inorganic fibers include a mixture of one or more of carbon fibers, glass fibers, wollastonite fibers, and basalt fibers.

Furthermore, in S1, the aspect ratio of the inorganic fiber material is greater than 50.

Furthermore, in S1, the length of the inorganic fiber material ranges from 1 to 1500 μm, preferably from 300 to 1500 μm.

Furthermore, in S1, the diameter of the inorganic fiber material is 1 to 40 μm, preferably 5 to 25 μm.

Furthermore, in S1, the surface treatment is one or more of coupling agent treatment, surface chemical modification treatment, surface coating treatment, and plasma treatment.

Furthermore, in S1, the narrow molecular weight distribution polyethylene has a weight average molecular weight of 150,000 to 1,000,000 and a molecular weight distribution of less than 3.0.

Furthermore, in S3, the extrusion temperature of the twin-screw extruder is 160°C to 240°C, and the temperature of the spinneret is 180°C to 250°C.

Furthermore, in S4, the temperature during high-magnification stretching is 60°C to 150°C.

Furthermore, in S4, the cooling temperature is 5°C to 40°C, and the cooling medium is air or water.

Furthermore, in S5, the high-temperature multi-ratio stretching is performed at a ratio of 5 to 20 times and at a temperature of 70°C to 130°C.

A second aspect of the present invention provides cut-resistant fibers obtained by the above-described manufacturing method.

The main ideas behind this invention are as follows:

Currently, the main reason why cut-resistant fibers cannot be formed by melt-spinning polyethylene is that the molecular weight of melt-spun fibers is relatively low, and low-molecular-weight polyethylene has relatively low abrasion resistance, which is disadvantageous in terms of cut resistance. The present invention uses polyethylene with a weight-average molecular weight of more than 100,000 to first improve the abrasion resistance of the polyethylene substrate, and by using a polyethylene molecular chain structure with a narrow molecular weight distribution, the molecular weight distribution of the polyethylene is made less than 3.0, further reducing the effect of low molecular weight on molecular chain slippage or disentanglement, thereby improving the abrasion resistance and cut resistance of the polyethylene substrate.

In order to further improve the cut resistance of the fibers, in addition to improving the abrasion resistance of the polyethylene substrate, the inorganic fiber material is further melt-blended with narrow molecular weight distribution polyethylene. The present invention fully utilizes the high draw ratio characteristics of narrow molecular weight distribution polyethylene melt, drawing the polyethylene melt at high speed after it is discharged from the spinneret, increasing the draw ratio of the polyethylene fibers to more than 180 times, thereby fully orienting the inorganic fiber material blended into the polyethylene melt and forming it parallel to the direction of the textile product. The oriented inorganic fiber filler significantly improves the cut resistance of the textile product.

The present invention uses polyethylene raw materials with a reasonable molecular weight distribution and range, and a directional processing process to uniformly disperse inorganic fiber materials within the polyethylene fibers and form an oriented structure, thereby obtaining polyethylene fiber products with cut-resistant properties. Compared to current cut-resistant fibers and manufacturing methods, the cut-resistant fiber products of the present invention have the following advantages:

(1) There is no need to use solvents in the spinning process, and no mixing or cooling processes are required, significantly simplifying the spinning process for high-performance polyethylene fibers.

(2) Significantly reduces manufacturing costs due to solvent processing and solvent recovery, making the process more environmentally friendly.

(3) The manufacturing process is solvent-free, significantly improving the safety factor in the manufacturing process.

(4) The processing method for inorganic fibers is simple, reducing the number of processing steps and lowering processing costs.

The present invention will now be described in detail with reference to specific examples. The following examples will help those skilled in the art to better understand the present invention, but are not intended to limit the present invention in any way. Those skilled in the art may also make several modifications and improvements without departing from the spirit of the present invention. All of these modifications and improvements fall within the scope of protection of the present invention.

Any features of the present technical solution, such as manufacturing means, materials, structure, or composition ratio, that are not explicitly described shall be considered to be general technical features disclosed in the prior art.

Characterization data for the polyethylene raw materials in the examples was obtained using the following methods:

The tensile property test was conducted using the ANSI/ISEA 2016 method and equipment to test the cut resistance level of the finished yarn.

Example 1
Glass fibers (length 600 μm, diameter 10 μm), silane coupling agent KH560, liquid paraffin, and polyethylene wax were placed in a high-speed mixer in a ratio of 6:2:1:1, and mixed at high speed while controlling the temperature at 70°C to 90°C. Each time, the mixture was blended for 1 minute and stopped for 30 seconds, for a total mixing time of approximately 10 minutes, and treated glass fibers were obtained.

Polyethylene obtained by polymerization using a late transition metal catalyst was used, and had a weight-average molecular weight of 150,000, an Mw/Mn ratio of 2.8, a methyl group count per 1,000 carbon atoms of less than 0.1, and a density of 0.945 g/ ^cm3 . The polyethylene was blended with treated glass fiber, antioxidant 1010, and zinc stearate in a ratio of 95:4.5:0.2:0.3 for 3 minutes to obtain a raw material.

The raw materials were fed into a screw extruder and melt-extruded. The temperature from the material feed section to the material discharge section of the twin screw was 145°C to 180°C, the rotation speed was 90 rpm, and the hole diameter of the extrusion die was 0.5 mm.

The extruded raw yarn was drawn multiple times at 80°C and then wound up. The draw ratio was 400 times the extrusion speed, and the cooling temperature and medium after drawing were air at 20°C. The wound fiber was again drawn multiple times at a high temperature, the draw ratio was 7 times, and the heating path temperature was 100°C.

A cut resistance test was conducted on fibers stretched at high temperatures and multiple ratios, and the cut resistance reached A5.

Example 2
Carbon fibers (length 1000 μm, diameter 7 μm) and fluorine gas were placed in a sealed reaction vessel, and the fluorine gas pressure was set to 0.7 to 0.8 MPa, the temperature was set to 150°C, and the reaction was continued for 2 hours to obtain surface-fluorinated carbon fibers.

Polyethylene obtained by polymerization using a metallocene catalyst and having a weight average molecular weight of 150,000, an Mw/Mn ratio of 2.9, a methyl group number per ^1,000 carbon atoms of less than 0.1, and a density of 0.948 g/cm was blended with fluorinated carbon fiber, fluororubber, antioxidant 1010, and antioxidant PS802 in a ratio of 95:4.5:0.1:0.2:0.2 for 3 minutes to obtain a carbon fiber/polyethylene blend.

The carbon fiber/polyethylene blend was fed into a screw extruder and melt-extruded. The temperature from the material supply section to the material discharge section of the twin screw was 145°C to 190°C, the rotation speed was 90 rpm, and the hole diameter of the extrusion die was 0.4 mm.

The extruded raw yarn was drawn multiple times at 60°C and then wound up. The draw ratio was 300 times the extrusion speed, and the cooling temperature and medium after drawing was a water bath at 20°C. The wound fiber was again drawn multiple times at a high temperature, the draw ratio was 8 times, and the heating path temperature was 110°C.

A cut resistance test was conducted on fibers stretched at high temperatures and multiple ratios, and the cut resistance reached A5.

Example 3
Wollastonite fiber (length 300 μm, diameter 5 μm), titanate coupling agent JN-9, liquid paraffin, and polyethylene wax were placed in a high-speed mixer in a ratio of 6:2:1:1, and mixed at high speed while controlling the temperature between 70°C and 90°C. Each time, the mixture was blended for 1 minute and then stopped for 30 seconds, for a total mixing time of approximately 10 minutes, to obtain treated wollastonite fiber.

Polyethylene obtained by polymerization using a metallocene catalyst and having a weight-average molecular weight of 400,000, an Mw/Mn ratio of 2.9, a methyl group number per 1,000 carbon atoms of less than 0.1, and a density of 0.941 g/ ^cm3 was blended with treated wollastonite fiber, stearic acid, calcium stearate, and antioxidant 1010 in a ratio of 94:5:0.3:0.4:0.3, with the blending time being 3 minutes, to obtain a raw material.

The raw materials were fed into a screw extruder and melt-extruded. The temperature from the material feed section to the material discharge section of the twin screw was 145°C to 190°C, the rotation speed was 110 rpm, and the hole diameter of the extrusion die was 1 mm.

The extruded raw yarn was drawn multiple times at 100°C and then wound up. The draw ratio was 180 times the extrusion speed, and the cooling temperature and medium after drawing were 40°C hot air. The wound fiber was again drawn multiple times at a high temperature, the draw ratio was 5 times, and the heating path temperature was 120°C.

A cut resistance test was conducted on fibers stretched at high temperatures and multiple ratios, and the cut resistance reached A5.

Example 4
Basalt fiber (length 1500 μm, diameter 25 μm), aluminate coupling agent 411-C, liquid paraffin, and polyethylene wax were placed in a high-speed mixer in a ratio of 6:2:1:1, and mixed at high speed while controlling the temperature at 70°C to 90°C. Each time, the mixture was blended for 1 minute and then stopped for 30 seconds, for a total mixing time of approximately 10 minutes, to obtain treated basalt fiber.

A raw material was obtained by blending polyethylene obtained by metallocene polymerization, having a weight average molecular weight of 1,000,000, an Mw/Mn ratio of 2.7, a methyl group number per ^1,000 carbon atoms of less than 0.1, and a density of 0.943 g/cm, with treated wollastonite fiber, stearic acid, calcium stearate, and antioxidant 1010 in a ratio of 94:5:0.3:0.4:0.3, for a blending time of 3 minutes.

The raw materials were fed into a screw extruder and melt-extruded. The temperature from the material feed section to the material discharge section of the twin screw was 145°C to 190°C, the rotation speed was 200 rpm, and the hole diameter of the extrusion die was 5 mm.

The extruded yarn was drawn multiple times at 120°C and then wound up, with the draw ratio set to 200 times the extrusion speed. The wound fiber was again drawn multiple times at a high temperature, with the draw ratio set to 9 times and the heating path temperature set to 125°C.

A cut resistance test was conducted on fibers stretched at high temperatures and multiple ratios, and the cut resistance reached A5.

Example 5
Carbon fibers (length 1000 μm, diameter 20 μm) and fluorine gas were placed in a sealed reaction vessel, and the fluorine gas pressure was set to 0.7 to 0.8 MPa, the temperature was set to 150°C, and the reaction was continued for 2 hours to obtain surface-fluorinated carbon fibers.

Glass fiber, fluorinated carbon fiber, silane coupling agent KH560, liquid paraffin, and polyethylene wax were placed in a high-speed mixer in a ratio of 2:4:2:1:1 and mixed at high speed, controlling the temperature between 70°C and 90°C. Each time, the mixture was blended for 1 minute and then stopped for 30 seconds, for a total mixing time of approximately 10 minutes, yielding the processed mixed fiber.

Polyethylene obtained by polymerization using a late transition metal catalyst and having a weight-average molecular weight of 400,000, an Mw/Mn ratio of 2.4, a methyl group number per 1,000 carbon atoms of less than 0.1, and a density of 0.941 g/ ^cm3 was blended with the treated mixed fibers, stearic acid, calcium stearate, and antioxidant 1010 in a ratio of 94:5:0.3:0.4:0.3 for a blending time of 3 minutes to obtain a raw material.

The raw materials were fed into a screw extruder and melt-extruded. The temperature from the material feed section to the material discharge section of the twin screw was 145°C to 200°C, the rotation speed was 220 rpm, and the hole diameter of the extrusion die was 10 mm.

The extruded yarn was drawn multiple times at 150°C and then wound up, with the draw ratio set to 600 times the extrusion speed. The wound fiber was again drawn multiple times at a high temperature, with the draw ratio set to 15 times and the heating path temperature set to 130°C.

A cut resistance test was conducted on fibers stretched at high temperatures and multiple ratios, and the cut resistance reached A6.

(Comparative Example 1)
A polyethylene obtained by polymerization using a late transition metal catalyst had a weight-average molecular weight of 150,000, an Mw/Mn ratio of 2.8, a methyl group count per 1,000 carbon atoms of less than 0.1, and a density of 0.945 g/ ^cm3 . The polyethylene, antioxidant 1010, and zinc stearate were blended in a ratio of 99.5:0.2:0.3 for 3 minutes to obtain a raw material.

The raw materials were fed into a screw extruder and melt-extruded. The temperature from the material feed section to the material discharge section of the twin screw was 145°C to 180°C, the rotation speed was 90 rpm, and the hole diameter of the extrusion die was 0.5 mm.

The extruded raw yarn was drawn multiple times at 80°C and then wound up. The draw ratio was 400 times the extrusion speed, and the cooling temperature and medium after drawing were air at 20°C. The wound fiber was again drawn multiple times at a high temperature, the draw ratio was 7 times, and the heating path temperature was 100°C.

A cut resistance test was conducted on fibers stretched at high temperatures and multiple ratios, and the cut resistance reached A1.

(Comparative Example 2)
Glass fiber, silane coupling agent KH560, liquid paraffin, and polyethylene wax were placed in a high-speed mixer in a ratio of 6:2:1:1, and mixed at high speed while controlling the temperature at 70°C to 90°C. Each time, the mixture was blended for 1 minute and stopped for 30 seconds, for a total mixing time of about 10 minutes, and treated glass fiber was obtained.

Polyethylene obtained by polymerization using a late transition metal catalyst was used, and had a weight-average molecular weight of 150,000, an Mw/Mn ratio of 2.8, a methyl group count per 1,000 carbon atoms of less than 0.1, and a density of 0.945 g/ ^cm3 . The polyethylene was blended with treated glass fiber, antioxidant 1010, and zinc stearate in a ratio of 95:4.5:0.2:0.3 for 3 minutes to obtain a raw material.

The raw materials were fed into a screw extruder and melt-extruded. The temperature from the material feed section to the material discharge section of the twin screw was 145°C to 180°C, the rotation speed was 90 rpm, and the hole diameter of the extrusion die was 0.5 mm.

The extruded raw yarn was drawn multiple times at 80°C and then wound up. The draw ratio was 40 times the extrusion speed, and the cooling temperature and medium after drawing were air at 20°C. The wound fiber was again drawn multiple times at a high temperature, the draw ratio was 7 times, and the heating path temperature was 100°C.

A cut resistance test was conducted on fibers stretched at high temperatures and multiple ratios, and the cut resistance reached A3.

(Comparative Example 3)
A polyethylene obtained by polymerization using a late transition metal catalyst had a weight-average molecular weight of 150,000, an Mw/Mn ratio of 2.8, a methyl group count per 1,000 carbon atoms of less than 0.1, and a density of 0.945 g/ ^cm3 . The polyethylene was blended with untreated glass fiber, antioxidant 1010, and zinc stearate in a ratio of 95:4.5:0.2:0.3 for 3 minutes to obtain a raw material.

The raw materials were fed into a screw extruder and melt-extruded. The temperature from the material feed section to the material discharge section of the twin screw was 145°C to 180°C, the rotation speed was 90 rpm, and the hole diameter of the extrusion die was 0.5 mm.

The extruded raw yarn was drawn at multiple ratios at 80°C and then wound up. When the draw ratio was set to 180 times the extrusion speed, the yarn broke.

(Comparative Example 4)
Glass fiber, silane coupling agent KH560, liquid paraffin, and polyethylene wax were placed in a high-speed mixer in a ratio of 6:2:1:1, and mixed at high speed while controlling the temperature at 70°C to 90°C. Each time, the mixture was blended for 1 minute and stopped for 30 seconds, for a total mixing time of about 10 minutes, and treated glass fiber was obtained.

Polyethylene obtained by polymerization using a late transition metal catalyst was used, and had a weight-average molecular weight of 150,000, an Mw/Mn ratio of 5.4, a methyl group count per 1,000 carbon atoms of less than 0.1, and a density of 0.952 g/ ^cm3 . The polyethylene was blended with treated glass fiber, antioxidant 1010, and zinc stearate in a ratio of 95:4.5:0.2:0.3 for 3 minutes to obtain a raw material.

The raw materials were fed into a screw extruder and melt-extruded. The temperature from the material feed section to the material discharge section of the twin screw was 145°C to 180°C, the rotation speed was 90 rpm, and the hole diameter of the extrusion die was 0.5 mm.

The extruded raw yarn was drawn at multiple ratios at 80°C and then wound up. When the draw ratio was set to 180 times the extrusion speed, the yarn broke.

(Comparative Example 5)
Glass fiber, silane coupling agent KH560, liquid paraffin, and polyethylene wax were placed in a high-speed mixer in a ratio of 6:2:1:1, and mixed at high speed while controlling the temperature at 70°C to 90°C. Each time, the mixture was blended for 1 minute and stopped for 30 seconds, for a total mixing time of about 10 minutes, and treated glass fiber was obtained.

Polyethylene obtained by polymerization using a late transition metal catalyst was used, and had a weight-average molecular weight of 150,000, an Mw/Mn ratio of 5.4, a methyl group count per 1,000 carbon atoms of less than 0.1, and a density of 0.952 g/ ^cm3 . The polyethylene was blended with treated glass fiber, antioxidant 1010, and zinc stearate in a ratio of 95:4.5:0.2:0.3 for 3 minutes to obtain a raw material.

The raw materials were fed into a screw extruder and melt-extruded. The temperature from the material feed section to the material discharge section of the twin screw was 145°C to 180°C, the rotation speed was 90 rpm, and the hole diameter of the extrusion die was 0.5 mm.

The extruded raw yarn was drawn multiple times at 80°C and then wound up. The draw ratio was 30 times the extrusion speed, and the cooling temperature and medium after drawing were air at 20°C. The wound fiber was again drawn multiple times at a high temperature, the draw ratio was 4 times, and the heating path temperature was 100°C.

A cut resistance test was conducted on fibers stretched at high temperatures and multiple ratios, and the cut resistance reached A3.

(Comparative Example 6)
A method for producing abrasion-resistant and cut-resistant ultra-high molecular weight polyethylene fibers, in which 0.5 parts of a silane KH550 coupling agent, 5 parts of nanosilica, 6 parts of short basalt fibers, 0.2 parts of sodium stearate, 0.2 parts of pentaerythritol tetrakis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], and 0.8 parts of a nanodispersant VK-01 are added to 1,000 parts of white oil, and the mixture is treated in a high-speed rotary emulsifier at 8,000 r/min for 4 hours, with the temperature controlled at 60°C, to form a mother liquor. Eighty parts of ^a resin raw material having a weight-average molecular weight of 4,000,000, a molecular weight distribution of 5.6, an average resin particle size of 180 μm, a particle size distribution width (d90-d10)/d50: 1.2, and a bulk density of 0.34 g/cm3 were added to a ball mill, the temperature of which was controlled at 50°C. The mother liquor was gradually added to the ball mill at a rate of 2 parts/min and stirred uniformly. The resulting mixture was then vacuum-sealed for 4 hours. The resulting mixture was then wet-spun through a twin-screw extruder, a metering pump, and a spinning box, followed by extraction, drying, drawing, and hot drawing. Fiber was then obtained by winding. The resulting fiber was tested and found to have a cut resistance level of A3.

As can be seen from the table above, blending polyethylene with treated inorganic fibers produces polyethylene fiber products with better cut resistance than pure polyethylene, with cut resistance reaching A3 levels. When polyethylene with a weight-average molecular weight of 150,000 to 1,000,000 and a molecular weight distribution of less than 3.0 is used and mixed with treated inorganic fibers, better stretchability can be achieved in the molten state in the spinneret, with draw ratios greater than 180 times. When the draw ratio in the molten state exceeds 180 times, the cut resistance of the fiber product improves again, reaching A5 to A6 levels.

The cut-resistant fibers produced by this method are far superior in cost, process complexity, and environmental aspects to the solution dissolution and current melt extrusion methods used to produce high-performance fibers, and their cut resistance is also superior to that of solution-processed ultra-high molecular weight polyethylene cut-resistant fiber products.

The above-described embodiments are intended to facilitate understanding and use of the invention by those skilled in the art. Those skilled in the art will be able to easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without any creative effort. Therefore, the present invention is not limited to the above-described embodiments, and all improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the present invention should fall within the scope of protection of the present invention.

Claims (10)

Step S1: surface-treating an inorganic fiber material to improve affinity of the inorganic fiber material to a polyethylene substrate;
Step S2: mixing the narrow molecular weight distribution polyethylene obtained by polymerizing a single-site catalyst, the inorganic fiber material treated in step S1, and a processing aid to form a blend material;
Step S3: feeding the blended material obtained in step S2 into a twin-screw extruder to melt-blend the material, and obtaining an undrawn fiber melt using a spinneret;
Step S4: drawing the undrawn molten fiber at a high draw ratio at a high temperature until the draw ratio exceeds 180 times and the inorganic fiber reaches a uniaxially oriented state, followed by cooling the inorganic fiber;
and step S5 of hot drawing the inorganic fibers cooled in step S4 again at a high temperature at a multiple ratio to obtain cut-resistant polyethylene composite fibers.
A method for producing cut-resistant fibers. In S1, the inorganic fibers include a mixture of one or more of carbon fibers, glass fibers, wollastonite fibers, and basalt fibers.
2. The method of claim 1 for producing cut resistant fibers. In S1, the aspect ratio of the inorganic fiber material is greater than 50;
2. The method of claim 1 for producing cut resistant fibers. In S1, the surface treatment is one or more of a coupling agent treatment, a surface chemical modification treatment, a surface coating treatment, and a plasma treatment.
2. The method of claim 1 for producing cut resistant fibers. In S1, the narrow molecular weight distribution polyethylene has a weight average molecular weight of 150,000 to 1,000,000 and a molecular weight distribution of less than 3.0.
2. The method of claim 1 for producing cut resistant fibers. In S3, the extrusion temperature of the twin-screw extruder is 160°C to 240°C, and the temperature of the spinneret is 180°C to 250°C.
2. The method of claim 1 for producing cut resistant fibers. In S4, the temperature during high-ratio stretching is 60°C to 150°C.
2. The method of claim 1 for producing cut resistant fibers. In S4, the cooling temperature is 5°C to 40°C, and the cooling medium is air or water.
2. The method of claim 1 for producing cut resistant fibers. In S5, the high-temperature multi-ratio stretching is performed at a ratio of 5 to 20 times and at a temperature of 70°C to 130°C.
2. The method of claim 1 for producing cut resistant fibers. Cut-resistant fiber obtained by the manufacturing method described in any one of claims 1 to 9.