KR20250134125A - Cut-resistant fiber and its manufacturing method - Google Patents

Abstract

The present invention relates to a cut-resistant fiber and a method for producing the same, comprising the steps of: surface-treating an inorganic fiber material to increase the affinity of the inorganic fiber material for a polyethylene substrate; mixing a narrow molecular weight distribution polyethylene obtained by polymerization with a single active center catalyst, the treated inorganic fiber material, and a processing aid to form a mixture; feeding the obtained mixture into a twin-screw extruder to melt and mix, and obtaining an undrawn fiber melt through a spinneret; drawing the undrawn fiber melt at a high temperature and a high magnification, such that the magnification is greater than 180 times, and the drawing is continued until the inorganic fiber reaches a unidirectional orientation state, and then cooling the undrawn fiber; and drawing the cooled inorganic fiber again at a high temperature and a high magnification to obtain a cut-resistant polyethylene composite fiber. Compared with the prior art, the present invention solves problems such as environmental pollution, high cost, and cumbersome steps that occur during the production of traditional ultra-high molecular weight polyethylene fibers and modifications based thereon.

Description

Cut-resistant fiber and its manufacturing method

The present invention relates to the field of polymer material technology, and more particularly, to a cut-resistant fiber and a method for producing the same.

With the rapid development of science and technology, the demand for special fibers is constantly increasing in the engineering field. High-performance polyethylene fiber is lightweight and strong, has a long service life, and possesses properties such as wear resistance, high strength, moisture resistance, and corrosion resistance. Therefore, it is widely used in tow ropes, buoyancy ropes, rescue ropes, and cut-resistant gloves. In recent years, the use of high-performance fibers has been gradually increasing in the field of cut-resistant gloves, such as civilian and police cut-resistant gloves and military clothing. Demand for high-performance fibers' cut-resistant performance is also increasing. Due to its low raw material cost and high strength and high modulus, high-performance polyethylene fiber is gradually developing its application in this field.

Currently, polyethylene radiation methods applied in the field of cut prevention can be broadly divided into three types.

The first type, as disclosed in Chinese Patent CN200980146604, Chinese Patent CN201410264678, International Publication No. WO2005/066401A1, and U.S. Patent US430577, involves first swelling and dissolving high-molecular-weight polyethylene in a solvent, then extruding polyethylene yarn. The yarn is then subjected to solvent extraction and drying to remove the solvent, and finally, multi-stage drawing is performed to obtain high-strength, high-modulus polyethylene fibers. This method yields high-strength, high-modulus, ultra-high molecular weight polyethylene fiber products, which possess excellent mechanical properties and relatively good cut resistance. These products typically achieve an EN388-2 cut resistance rating and are currently the mainstream fiber raw material for cut resistance products. However, ultra-high molecular weight polyethylene fibers are difficult to process, have complex production processes, are expensive, have difficult-to-resolve solvent volatilization and recovery issues during production, and have a significant environmental impact. Furthermore, their cut resistance performance does not meet the high standards required in the cut resistance field.

The second type, primarily disclosed in Chinese patents CN106149085A, CN107326462A, and CN108315833A, utilizes ultra-high molecular weight polyethylene (UMP) spinning for additional reinforcement. The primary method involves mixing nanomaterials and inorganic materials, such as graphene, nano-silicon dioxide, carbon fibers, and glass fibers, with UMP raw materials to obtain fibers with high cut resistance through a spinning process. While fibers manufactured using this method exhibit superior cut resistance compared to UMP fibers, processing costs are extremely high and the process is extremely difficult. This is primarily due to the difficulty of uniformly dispersing nano-scale inorganic materials in a solvent while simultaneously maintaining uniform dispersion without agglomeration within the fiber product. This necessitates stringent modification processes, such as emulsification and grafting, for both inorganic and nanomaterials. Furthermore, recovering and recycling the solvent containing nano- and inorganic materials is also extremely difficult, and the cost of waste solvent disposal is extremely high.

The third type is a method of forming wear-resistant fiber products by blending and knitting inorganic fibers and polyethylene fibers, mainly in Chinese patent CN201780040580.9, Chinese patent CN201880081866.6, Chinese patent CN201080007173.6, etc. When gloves or fabrics are made with these fiber products, the inorganic fibers easily protrude out of the fibers, affecting the comfort, and the cost of blended knitting is also relatively high.

The purpose of the present invention is to provide a cut-resistant fiber and a method for producing the same to solve the above problems, thereby solving problems such as environmental pollution, high cost, and cumbersome steps that occur during the production of traditional ultra-high molecular weight polyethylene fibers and modification thereof.

The object of the present invention is achieved through the following technical solutions.

The first aspect of the present invention provides a method for producing a cut-resistant fiber,

S1: A step of surface-treating an inorganic fiber material to increase the affinity of the inorganic fiber material for a polyethylene substrate;

S2: A step of forming a mixture by mixing a narrow molecular weight distribution polyethylene obtained by polymerization with a single active center catalyst, an inorganic fiber material treated in S1, and a processing aid;

S3: Step of feeding the mixture obtained in S2 into a twin-screw extruder to melt and mix, and obtaining an unstretched fiber melt through a spinneret;

S4: A step of drawing a non-drawn fiber melt at a high temperature and a high magnification, but drawing the melt at a magnification greater than 180 times, and drawing until the inorganic fiber reaches a unidirectional orientation state, and then cooling;

S5: A step of drawing the cooled inorganic fiber in S4 again at a high temperature and at a multi-ratio to obtain a cut-resistant polyethylene composite fiber.

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

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

Furthermore, in S1, the length range of the inorganic fiber material is 1 to 1500 μm, preferably 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 weight average molecular weight of the narrow molecular weight distribution polyethylene is between 150,000 and 1,000,000, and the molecular weight distribution is lower than 3.0.

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

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

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

Furthermore, in S5, the high temperature multi-extension magnification is 5 to 20 times, and the temperature is 70℃ to 130℃.

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

The core concept of the present invention is as follows.

The main reason why cut-resistant fibers cannot be formed by melt spinning of polyethylene at present is firstly because the molecular weight of the melt-spun fiber is relatively low, and low-molecular-weight polyethylene often has low abrasion resistance, which is disadvantageous for cut resistance. The present invention first improves the abrasion resistance of the polyethylene substrate by using polyethylene having a weight-average molecular weight higher than 100,000, and at the same time adopts a polyethylene molecular chain structure with a narrow molecular weight distribution to make the polyethylene molecular weight distribution lower than 3.0, thereby further reducing the slippage or disentanglement effect between the molecular chains of low molecular weight, thereby improving the abrasion resistance and cut resistance of the polyethylene substrate.

In order to further improve the cut resistance of the fiber, an inorganic fiber material and a narrow molecular weight distribution polyethylene were melt-blended on the basis of improving the wear resistance of the polyethylene substrate. The present invention makes full use of the high draw ratio characteristics of the narrow molecular weight distribution polyethylene melt, and by ejecting the polyethylene melt from the spinneret and then stretching it at high speed to make the draw ratio of the polyethylene fiber more than 180 times, the inorganic fiber material mixed within the polyethylene melt is sufficiently oriented and formed parallel to the direction of the fiber product. The oriented inorganic fiber filler significantly improved the cut resistance of the fiber product.

The present invention utilizes a polyethylene raw material with a reasonable molecular weight distribution and molecular weight range, and a processing process suited to the intended purpose, to uniformly disperse inorganic fiber materials within the polyethylene fibers and form an oriented structure, thereby obtaining a polyethylene fiber product with cut-resistant properties. Compared to existing cut-resistant fibers and manufacturing methods, the cut-resistant fiber product of the present invention exhibits the following advantages.

1) The high-performance polyethylene fiber spinning process is greatly simplified by eliminating the need for solvents during the spinning process and eliminating the mixing and cooling processes.

2) The high production costs due to solvent treatment and solvent recovery have been significantly reduced, and the process is more environmentally friendly.

3) Since it is solvent-free during the production process, the safety factor of the production process is greatly improved.

4) The simple method of processing weapon fibers reduces processing steps and reduces processing costs.

The present invention is described in detail below, with specific examples. While these examples will assist those skilled in the art in further understanding the present invention, they do not limit the invention in any way. It should be noted that those skilled in the art may make minor modifications and improvements without departing from the scope of the present invention. All such modifications and improvements fall within the scope of protection of the present invention.

Any features such as manufacturing means, materials, structures or composition combinations that are not clearly described in this technical solution are considered general technical features disclosed in prior art.

In the examples, the characteristic data of the polyethylene raw material are obtained by the following method.

Tensile performance testing uses the methods and equipment of 'ANSI/ISEA 2016' to test the breakage resistance rating of the finished yarn.

Example 1

Glass fiber (length size 600 μm, diameter 10 μm), silane coupling agent KH560, liquid paraffin, and polyethylene wax are 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, mixing for 1 minute each time and stopping for 30 seconds, and the total mixing time is about 10 minutes to obtain treated glass fiber.

Polyethylene having a weight average molecular weight of 150,000, Mw/Mn of 2.8, a thousand carbon methyl number of <0.1, and a density of 0.945 g/cm ³ obtained by polymerization with a post-transition metal catalyst is taken. The raw material is obtained by mixing polyethylene, treated glass fiber, antioxidant 1010, and zinc stearate in a ratio of 95:4.5:0.2:0.3, and mixing for 3 minutes.

The raw material is fed into a screw extruder and melted and extruded. The temperature from the feed to discharge of the twin screw ranges from 145°C to 180°C, the rotation speed is 90 r/min, and the diameter of the extrusion die is 0.5 mm.

The extruded yarn is stretched multiple times at 80°C and then wound up. The stretching ratio is 400 times the extrusion speed. The cooling temperature and medium after stretching are 20°C air. The wound fiber is then stretched multiple times at high temperature. The stretching ratio is 7 times and the heat path temperature is 100°C.

A cut resistance test is performed on a fiber stretched multiple times at high temperature, and the cut resistance can reach A5.

Example 2

Carbon fiber (length 1000 μm, diameter 7 μm) and fluorine gas are placed in a sealed reactor, and the reaction is continuously performed at a fluorine gas pressure of 0.7 to 0.8 Mpa and a temperature of 150°C for 2 hours to obtain carbon fiber with a fluorinated surface.

Polyethylene having a weight average molecular weight of 150,000, Mw/Mn of 2.9, a thousand carbon methyl number of <0.1, and a density of 0.948 g/cm ³ obtained by polymerization with a metallocene catalyst is mixed with fluorinated carbon fiber, fluororubber, antioxidant 1010, and antioxidant PS802 in a ratio of 95:4.5:0.1:0.2:0.2 to obtain a carbon fiber/polyethylene mixture, and the mixing time is 3 minutes.

A carbon fiber/polyethylene mixture is fed into a screw extruder and melt-extruded. The temperature from the feed to discharge of the twin screw ranges from 145°C to 190°C, the rotation speed is 90 r/min, and the extrusion die diameter is 0.4 mm.

The extruded yarn is stretched multiple times at 60°C and then wound. The stretching ratio is 300 times the extrusion speed. The cooling temperature and medium after stretching are a 20°C water bath. The wound fiber is then stretched multiple times at high temperature. The stretching ratio is 8 times and the heat path temperature is 110°C.

A cut resistance test is performed on a fiber stretched multiple times at high temperature, and the cut resistance can reach A5.

Example 3

Wollastonite fibers (length 300 μm, diameter 5 μm), titanate coupling agent JN-9, liquid paraffin, and polyethylene wax are 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, mixing for 1 minute each time and stopping for 30 seconds, and the total mixing time is about 10 minutes to obtain treated wollastonite fibers.

Polyethylene having a weight average molecular weight of 400,000, Mw/Mn of 2.9, a thousand carbon methyl number of <0.1, and a density of 0.941 g/cm ³ obtained by polymerization with a metallocene catalyst, and treated wollastonite fiber, stearic acid, calcium stearate, and antioxidant 1010 are mixed in a ratio of 94, 5, 0.3, 0.4, and 0.3, and the mixing time is 3 minutes to obtain a raw material.

The raw material is fed into a screw extruder and melted and extruded. The temperature from the feed to discharge of the twin screw ranges from 145°C to 190°C, the rotation speed is 110 r/min, and the diameter of the extrusion die is 1 mm.

The extruded yarn is stretched multiple times at 100°C and then wound. The stretching ratio is 180 times the extrusion speed. The cooling temperature and medium after stretching are 40°C hot air. The wound fiber is again stretched multiple times at high temperature. The stretching ratio is 5 times and the heat path temperature is 120°C.

A cut resistance test is performed on a fiber stretched multiple times at high temperature, and the cut resistance can reach A5.

Example 4

Basalt fibers (length 1500 μm, diameter 25 μm), aluminate coupling agent 411-C, liquid paraffin, and polyethylene wax are 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, mixing for 1 minute each time and stopping for 30 seconds, and the total mixing time is about 10 minutes to obtain treated basalt fibers.

Polyethylene having a weight average molecular weight of 1 million, Mw/Mn of 2.7, a thousand carbon methyl number of <0.1, and a density of 0.943 g/cm ³ obtained by polymerization with a metallocene catalyst, and treated wollastonite fiber, stearic acid, calcium stearate, and antioxidant 1010 are mixed in a ratio of 94, 5, 0.3, 0.4, and 0.3, and the mixing time is 3 minutes to obtain a raw material.

The raw material is fed into a screw extruder and melted and extruded. The temperature from the feed to discharge of the twin screw ranges from 145°C to 190°C, the rotation speed is 200 r/min, and the diameter of the extrusion die is 5 mm.

The extruded yarn is stretched multiple times at 120°C and then wound up. The stretch ratio is 200 times the extrusion speed. The wound fiber is then stretched multiple times at high temperature. The stretch ratio is 9 times, and the heat path temperature is 125°C.

A cut resistance test is performed on a fiber stretched multiple times at high temperature, and the cut resistance can reach A5.

Example 5

Carbon fiber (length 1000 μm, diameter 20 μm) and fluorine gas are placed in a sealed reactor, and the reaction is continuously performed at a fluorine gas pressure of 0.7 to 0.8 Mpa and a temperature of 150°C for 2 hours to obtain carbon fiber with a fluorinated surface.

Glass fiber, fluorocarbon fiber, silane coupling agent KH560, liquid paraffin, and polyethylene wax are placed in a high-speed mixer in a ratio of 2:4:2:1:1 and mixed at high speed, while controlling the temperature between 70℃ and 90℃, mixing for 1 minute each time and stopping for 30 seconds, and the total mixing time is about 10 minutes to obtain a treated mixed fiber.

Polyethylene having a weight average molecular weight of 400,000, Mw/Mn of 2.4, a thousand carbon methyl number of <0.1, and a density of 0.941 g/cm ³ obtained by polymerization with a post-transition metal catalyst, and treated mixed fibers, stearic acid, calcium stearate, and antioxidant 1010 are mixed in a ratio of 94, 5, 0.3, 0.4, and 0.3, and the mixing time is 3 minutes to obtain a raw material.

The raw material is fed into a screw extruder and melted and extruded. The temperature from the feed to discharge of the twin screw ranges from 145°C to 200°C, the rotation speed is 220 r/min, and the diameter of the extrusion die is 10 mm.

The extruded yarn is stretched multiple times at 150°C and then wound up. The stretch ratio is 600 times the extrusion speed. The wound fiber is then stretched multiple times at high temperature. The stretch ratio is 15 times, and the heat path temperature is 130°C.

A cut resistance test is performed on a fiber stretched multiple times at high temperature, and the cut resistance can reach A6.

Comparative Example 1

Polyethylene having a weight average molecular weight of 150,000, Mw/Mn of 2.8, a thousand carbon methyl number of <0.1, and a density of 0.945 g/cm ³ obtained by polymerization with a post-transition metal catalyst is taken. Polyethylene, antioxidant 1010, and zinc stearate are mixed in a ratio of 99.5:0.2:0.3, and the mixing time is 3 minutes to obtain the raw material.

The raw material is fed into a screw extruder and melted and extruded. The temperature from the feed to discharge of the twin screw ranges from 145°C to 180°C, the rotation speed is 90 r/min, and the diameter of the extrusion die is 0.5 mm.

The extruded yarn is stretched multiple times at 80°C and then wound up. The stretching ratio is 400 times the extrusion speed. The cooling temperature and medium after stretching are 20°C air. The wound fiber is then stretched multiple times at high temperature. The stretching ratio is 7 times and the heat path temperature is 100°C.

A cut resistance test is performed on a fiber stretched multiple times at high temperature, and the cut resistance can reach A1.

Comparative Example 2

Glass fiber, silane coupling agent KH560, liquid paraffin, and polyethylene wax are 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℃ and 90℃, mixing for 1 minute each time and stopping for 30 seconds, and the total mixing time is about 10 minutes to obtain treated glass fiber.

Polyethylene having a weight average molecular weight of 150,000, Mw/Mn of 2.8, a thousand carbon methyl number of <0.1, and a density of 0.945 g/cm ³ obtained by polymerization with a post-transition metal catalyst is taken. The raw material is obtained by mixing polyethylene, treated glass fiber, antioxidant 1010, and zinc stearate in a ratio of 95:4.5:0.2:0.3, and mixing for 3 minutes.

The raw material is fed into a screw extruder and melted and extruded. The temperature from the feed to discharge of the twin screw ranges from 145°C to 180°C, the rotation speed is 90 r/min, and the diameter of the extrusion die is 0.5 mm.

The extruded yarn is stretched multiple times at 80°C and then wound up. The stretching ratio is 40 times the extrusion speed. The cooling temperature and medium after stretching are 20°C air. The wound fiber is then stretched multiple times at high temperature. The stretching ratio is 7 times and the heat path temperature is 100°C.

A cut resistance test is performed on a fiber stretched multiple times at high temperature, and the cut resistance can reach A3.

Comparative Example 3

Polyethylene having a weight average molecular weight of 150,000, Mw/Mn of 2.8, a thousand carbon methyl number of <0.1, and a density of 0.945 g/cm ³ obtained by polymerization with a post-transition metal catalyst is taken. The raw material is obtained by mixing polyethylene, untreated glass fiber, antioxidant 1010, and zinc stearate in a ratio of 95:4.5:0.2:0.3, and mixing for 3 minutes.

The raw material is fed into a screw extruder and melted and extruded. The temperature from the feed to discharge of the twin screw ranges from 145°C to 180°C, the rotation speed is 90 r/min, and the diameter of the extrusion die is 0.5 mm.

The extruded yarn is stretched multiple times at 80℃ and then wound. The stretching ratio is 180 times the extrusion speed, and single yarns are generated.

Comparative Example 4

Glass fiber, silane coupling agent KH560, liquid paraffin, and polyethylene wax are 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℃ and 90℃, mixing for 1 minute each time and stopping for 30 seconds, and the total mixing time is about 10 minutes to obtain treated glass fiber.

Polyethylene having a weight average molecular weight of 150,000, Mw/Mn of 5.4, a thousand carbon methyl number of <0.1, and a density of 0.952 g/cm ³ obtained by polymerization with a post-transition metal catalyst is taken. The raw material is obtained by mixing polyethylene, treated glass fiber, antioxidant 1010, and zinc stearate in a ratio of 95:4.5:0.2:0.3, and mixing for 3 minutes.

The raw material is fed into a screw extruder and melted and extruded. The temperature from the feed to discharge of the twin screw ranges from 145°C to 180°C, the rotation speed is 90 r/min, and the diameter of the extrusion die is 0.5 mm.

The extruded yarn is stretched multiple times at 80℃ and then wound. The stretching ratio is 180 times the extrusion speed, and single yarns are generated.

Comparative Example 5

Glass fiber, silane coupling agent KH560, liquid paraffin, and polyethylene wax are 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℃ and 90℃, mixing for 1 minute each time and stopping for 30 seconds, and the total mixing time is about 10 minutes to obtain treated glass fiber.

Polyethylene having a weight average molecular weight of 150,000, Mw/Mn of 5.4, a thousand carbon methyl number of <0.1, and a density of 0.952 g/cm ³ obtained by polymerization with a post-transition metal catalyst is taken. The raw material is obtained by mixing polyethylene, treated glass fiber, antioxidant 1010, and zinc stearate in a ratio of 95:4.5:0.2:0.3, and mixing for 3 minutes.

The raw material is fed into a screw extruder and melted and extruded. The temperature from the feed to discharge of the twin screw ranges from 145°C to 180°C, the rotation speed is 90 r/min, and the diameter of the extrusion die is 0.5 mm.

The extruded yarn is stretched multiple times at 80°C and then wound. The stretching ratio is 30 times the extrusion speed. The cooling temperature and medium after stretching are 20°C air. The wound fiber is then stretched multiple times at high temperature. The stretching ratio is 4 times and the heat path temperature is 100°C.

A cut resistance test is performed on a fiber stretched multiple times at high temperature, and the cut resistance can reach A3.

Comparative Example 6

In a method for producing an abrasion-resistant, cut-resistant ultra-high molecular weight polyethylene fiber, 0.5 parts by weight of a silane KH550 coupling agent, 5 parts by weight of nano silicon dioxide, 6 parts by weight of basalt short fiber, 0.2 parts by weight of sodium stearate, 0.2 parts by weight of tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid]pentaerythritol ester, and 0.8 parts by weight of a nano dispersant VK-01 are added to 1000 parts by weight of white spirit, and the mixture is treated in a high-speed rotary emulsifier at 8000 r/min for 4 hours, while controlling the temperature to 60°C to form a mother liquid. Take 80 parts by weight of resin raw material with a weight average molecular weight of 4 million and a molecular weight distribution of 5.6, an average particle size of 180 μm, a particle size distribution width (d90-d10)/d50: 1.2, and a bulk density of 0.34 g/cm3, put it into a ball mill, control the temperature at 50℃, and slowly put the mother liquor into the ball mill again at a speed of 2 parts by weight/min, stir and mix evenly, and then vacuum-treat the mixed solution in a sealed container for 4 hours, and the mixed solution is extruded from a twin-screw extruder, a metering pump, and a spinning box through a wet spinning process, and is then extracted, dried, drawn and hot drawn, and then wound and formed. As a result of testing this fiber, the cut resistance grade of this fiber is A3.

[Table 1]

As can be seen from the above table, after mixing polyethylene and treated inorganic fibers, a polyethylene fiber product with better cut resistance than pure polyethylene can be obtained, and the cut resistance can reach the A3 level. When polyethylene with a weight average molecular weight of 150,000 to 1,000,000 and a molecular weight distribution lower than 3.0 is mixed with treated inorganic fibers and used, better drawing performance can be obtained in the molten state from the spinneret, and the draw ratio can be higher than 180 times. When the draw ratio in the molten state is higher than 180 times, the cut resistance of the fiber product can be improved again, and it can reach the A5 to A6 level. The cut-resistant fiber produced by this method is far superior to the method of producing high-performance fibers by solution dissolution and current melt extrusion methods in terms of cost, process complexity, and environmental protection, and the cut resistance is also superior to the ultra-high molecular weight polyethylene cut-resistant fiber products produced by the solution method.

The description of the above embodiments is intended to facilitate the understanding and use of the present invention by those skilled in the art. Those skilled in the art will readily appreciate various modifications to these embodiments and the general principles described herein can be applied to other embodiments without the need for significant effort. Therefore, the present invention is not limited to the above embodiments, and any improvements or 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 shall fall within the protection scope of the present invention.

Claims (10)

In a method for manufacturing a cut-resistant fiber,
S1: A step of surface-treating an inorganic fiber material to increase the affinity of the inorganic fiber material for a polyethylene substrate;
S2: A step of forming a mixture by mixing a narrow molecular weight distribution polyethylene obtained by polymerization with a single active center catalyst, an inorganic fiber material treated in S1, and a processing aid;
S3: Step of feeding the mixture obtained in S2 into a twin-screw extruder to melt and mix, and obtaining an unstretched fiber melt through a spinneret;
S4: A step of drawing a non-drawn fiber melt at a high temperature and a high magnification, but drawing the melt at a magnification greater than 180 times, and drawing until the inorganic fiber reaches a unidirectional orientation state, and then cooling;
S5: A method for producing a cut-resistant fiber, characterized by including a step of drawing the cooled inorganic fiber in S4 again at a high temperature with a multiplicity to obtain a cut-resistant polyethylene composite fiber. In the first paragraph,
In S1, a method for producing a cut-resistant fiber, characterized in that the inorganic fiber comprises a mixture of one or more of carbon fiber, glass fiber, wollastonite fiber, and basalt fiber. In the first paragraph,
A method for producing a cut-resistant fiber, characterized in that in S1, the length-to-width ratio of the inorganic fiber material is greater than 50. In the first paragraph,
A method for producing a cut-resistant fiber, characterized in that in S1, the surface treatment is one or more of coupling agent treatment, surface chemical modification treatment, surface coating treatment, and plasma treatment. In the first paragraph,
A method for producing a cut-resistant fiber, characterized in that in S1, the weight average molecular weight of the narrow molecular weight distribution polyethylene is between 150,000 and 1,000,000, and the molecular weight distribution is lower than 3.0. In the first paragraph,
A method for producing a cut-resistant fiber, characterized in that in S3, the extrusion temperature of the twin-screw extruder is 160°C to 240°C, and the spinneret temperature is 180°C to 250°C. In the first paragraph,
A method for producing a cut-resistant fiber, characterized in that the temperature during high-magnification stretching in S4 is 60°C to 150°C. In the first paragraph,
A method for producing a cut-resistant fiber, characterized in that in S4, the cooling temperature is 5°C to 40°C and the cooling medium is air or water. In the first paragraph,
A method for producing a cut-resistant fiber, characterized in that in S5, the high-temperature multi-extension ratio is 5 to 20 times and the temperature is 70°C to 130°C. A cut-resistant fiber characterized by being obtained by a manufacturing method according to any one of claims 1 to 9.