Cut-resistant fiber and method for producing same

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 again at a high temperature to obtain a cut-resistant polyethylene composite fiber. Compared with 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.

Description

[Technical Field]

[0001] The present invention relates to the technical field of polymeric materials, and in particular to cut-resistant fibers and methods for making same. [Background technology]

[0002] With the rapid development of science and technology, the demand for special fibers in the engineering industry is increasing. High-performance polyethylene fibers have properties such as light weight, high strength, long service life, wear resistance, high strength, moisture resistance, and corrosion resistance, and are 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. The demand for high-performance fibers with excellent cut resistance is also gradually increasing. Due to the low cost of raw materials and properties such as high strength and high modulus, the use of high-performance polyethylene fibers in these fields is gradually expanding.

[0003] Currently, the polyethylene spinning methods used in the cut-resistant field can be mainly divided into three types:

[0004] Class 1 includes methods disclosed in Chinese Patent CN200980146604, Chinese Patent CN201410264678, International Application Publication No. WO2005 / 066401A1, and U.S. Patent US430577, etc. These methods involve first dissolving and swelling high molecular weight polyethylene in a solvent, extruding the resulting polyethylene yarn, removing the solvent through solvent extraction and drying, and finally performing multi-stage drawing to obtain high-strength high-molecular-weight polyethylene fibers. These methods can produce 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 standard, making them the mainstream fiber raw 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 problems such as solvent evaporation and recovery during the manufacturing process, which has a significant impact on the environment, and the cut resistance does not meet the high requirements for cut-resistant products.

[0005] The second category, primarily disclosed in Chinese Patents CN106149085A, CN107326462A, and CN108315833A, includes further reinforced ultra-high molecular weight polyethylene (UHMWPE) spinning. The primary method involves blending nanomaterials and inorganic materials, such as graphene, nanosilica, carbon fiber, and glass fiber, into UHMWPE raw materials and processing them through a spinning process to obtain highly cut-resistant textiles. While textiles produced using this method offer superior cut resistance compared to UHMWPE fibers, the processing costs are extremely high and the process is challenging. The main drawbacks are the difficulty of uniformly dispersing nanoscale inorganic materials in a solvent without agglomeration and in the textile itself, which requires strict modification procedures such as emulsification and grafting of the inorganic and nanomaterials. Furthermore, the recovery and reuse of solvents containing nano- and inorganic materials is also extremely difficult, resulting in high waste solvent disposal costs.

[0006] The third category 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, but after such textile products are processed into gloves or fabrics, the inorganic fibers tend to come off, which not only affects comfort but also increases the cost of blending. Summary of the Invention

[0007] In order to solve the above problems, the object of the present invention is to provide a cut-resistant fiber and a method for producing the same, which solves the problems of environmental pollution, high costs, and complicated steps that arise from the conventional production of ultra-high molecular weight polyethylene fibers and modifications based thereon.

[0008] The object of the present invention is achieved by the following technical means.

[0009] A first aspect of the present invention is Step S1 of 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 perform melt blending, 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 high drawing ratio to obtain cut-resistant polyethylene composite fibers.

[0010] Furthermore, the inorganic fibers include a mixture of one or more of carbon fibers, glass fibers, wollastonite fibers, and basalt fibers.

[0011] Furthermore, in S1, the aspect ratio of the inorganic fiber material is greater than 50.

[0012] Furthermore, in S1, the length of the inorganic fiber material is in the range of 1 to 1500 μm, and preferably 300 to 1500 μm.

[0013] Furthermore, in S1, the inorganic fiber material has a diameter of 1 to 40 μm, preferably 5 to 25 μm.

[0014] Furthermore, 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.

[0015] 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.

[0016] 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.

[0017] Furthermore, in S4, the temperature during high-magnification stretching is 60°C to 150°C.

[0018] Furthermore, in S4, the cooling temperature is 5°C to 40°C, and the cooling medium is air or water.

[0019] 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.

[0020] A second aspect of the present invention provides a cut-resistant fiber obtained by the above-mentioned production method.

[0021] The main idea of ​​the present invention is as follows.

[0022] The main reason why cut-resistant fibers cannot be formed by melt-spinning polyethylene to date is that the molecular weight of the melt-spun fibers is relatively low, and low-molecular-weight polyethylene has relatively low abrasion resistance, which is unfavorable for 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 also uses a polyethylene molecular chain structure with a narrow molecular weight distribution, making the molecular weight distribution of the polyethylene less than 3.0, which further reduces the effect of low molecular weight on molecular chain slippage or disentanglement, thereby improving the abrasion resistance and cut resistance of the polyethylene substrate.

[0023] In order to further improve the cut resistance of the fiber, 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, and after the polyethylene melt is discharged from the spinneret, it is drawn at a high speed to a draw ratio of more than 180 times, so that the inorganic fiber material blended in the polyethylene melt is fully oriented and formed parallel to the direction of the fiber product. The oriented inorganic fiber filler significantly improves the cut resistance of the fiber product.

[0024] The present invention uses polyethylene raw materials with reasonable molecular weight distribution and molecular weight 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 with current cut-resistant fibers and manufacturing methods, the cut-resistant fiber products of the present invention have the following advantages:

[0025] (1) There is no need to use solvents in the spinning process, and there are no mixing or cooling processes, which greatly simplifies the spinning process of high-performance polyethylene fibers.

[0026] (2) The manufacturing costs due to solvent treatment and solvent recovery are significantly reduced, making the process more environmentally friendly.

[0027] (3) The manufacturing process is solvent-free, which significantly improves the safety factor in the manufacturing process.

[0028] (4) The inorganic fiber processing method is simple, reducing the processing steps and the processing cost. DETAILED DESCRIPTION OF THE INVENTION

[0029] The present invention will be described in detail below with reference to specific examples. The following examples are intended to help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any way. Those skilled in the art may make further modifications and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention.

[0030] In the present technical means, any features such as manufacturing means, materials, structures or composition ratios that are not explicitly described shall be considered as general technical features disclosed in the prior art.

[0031] The characterization data for the polyethylene raw materials in the examples was obtained by the following methods.

[0032] Tensile property testing was performed using the methods and equipment of ANSI / ISEA 2016 to test the cut resistance level of the finished yarn.

[0033] Example 1 Glass fiber (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. The temperature was controlled at 70°C to 90°C, and the mixture was blended for 1 minute each time, followed by a 30-second pause, for a total mixing time of approximately 10 minutes, to obtain treated glass fiber.

[0034] Obtained by polymerization using a late transition metal catalyst, it has a weight average molecular weight of 150,000, Mw / Mn of 2.8, methyl groups per 1,000 carbon atoms of less than 0.1, and a density of 0.945 g / cm. 3The polyethylene was blended with the 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.

[0035] The raw materials were fed to a screw extruder and melt-extruded. The temperature from the material feed section to the material discharge section of the twin screw was 145 to 180°C, the rotation speed was 90 rpm, and the hole diameter of the extrusion die was 0.5 mm.

[0036] The extruded raw yarn was drawn at a multiple draw ratio of 80°C and then wound up, with a draw ratio of 400 times the extrusion speed, and the cooling temperature and medium after drawing were air at 20°C. The wound fiber was again drawn at a multiple draw ratio of 7 times at a heating path temperature of 100°C.

[0037] Cut resistance tests were conducted on fibers drawn at high temperatures and multiple ratios, and the cut resistance reached A5.

[0038] Example 2 Carbon fibers (length 1000 μm, diameter 7 μm) and fluorine gas were placed in a sealed reaction vessel, the fluorine gas pressure was set to 0.7-0.8 MPa, the temperature was set to 150°C, and the reaction was continued for 2 hours to obtain surface-fluorinated carbon fibers.

[0039] Obtained by polymerization using a metallocene catalyst, it has a weight-average molecular weight of 150,000, Mw / Mn of 2.9, a methyl group count per 1,000 carbon atoms of less than 0.1, and a density of 0.948 g / cm. 3 The polyethylene 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.

[0040] The carbon fiber / polyethylene blend was 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 to 190°C, the rotation speed was 90 rpm, and the hole diameter of the extrusion die was 0.4 mm.

[0041] The extruded raw yarn was drawn at a multiple draw ratio of 60°C and then wound up, with the draw ratio being 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 at a multiple draw ratio of 8 times at a high temperature, with the heating path temperature being 110°C.

[0042] Cut resistance tests were conducted on fibers drawn at high temperatures and multiple ratios, and the cut resistance reached A5.

[0043] 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. The temperature was controlled between 70°C and 90°C, and 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.

[0044] Obtained by polymerization using a metallocene catalyst, it has a weight-average molecular weight of 400,000, Mw / Mn of 2.9, a methyl group count per 1,000 carbon atoms of less than 0.1, and a density of 0.941 g / cm 3 The polyethylene was blended with the treated wollastonite fiber, stearic acid, calcium stearate, and antioxidant 1010 in a ratio of 94:5:0.3:0.4:0.3 for 3 minutes to obtain a raw material.

[0045] The raw materials were fed to a screw extruder and melt-extruded. The temperature from the material feed section to the material discharge section of the twin screw was 145 to 190°C, the rotation speed was 110 rpm, and the hole diameter of the extrusion die was 1 mm.

[0046] The extruded raw yarn was drawn at a multiple draw ratio at 100°C and then wound up, with the draw ratio set to 180 times the extrusion speed, and the cooling temperature and medium after drawing was hot air at 40°C. The wound fiber was again drawn at a multiple draw ratio at a high temperature, with the draw ratio set to 5 times and the heating path temperature set to 120°C.

[0047] Cut resistance tests were conducted on fibers drawn at high temperatures and multiple ratios, and the cut resistance reached A5.

[0048] 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. The temperature was controlled at 70°C to 90°C, and the mixture was blended for 1 minute each time, followed by a 30-second break, for a total mixing time of approximately 10 minutes, to obtain processed basalt fiber.

[0049] Obtained by polymerization using a metallocene catalyst, it has a weight-average molecular weight of 1 million, Mw / Mn of 2.7, a methyl group count per 1000 carbon atoms of less than 0.1, and a density of 0.943 g / cm. 3 The polyethylene was blended with the treated wollastonite fiber, stearic acid, calcium stearate, and antioxidant 1010 in a ratio of 94:5:0.3:0.4:0.3 for 3 minutes to obtain a raw material.

[0050] The raw materials were fed to a screw extruder and melt-extruded. The temperature from the material feed section to the material discharge section of the twin screw was 145 to 190°C, the rotation speed was 200 rpm, and the hole diameter of the extrusion die was 5 mm.

[0051] The extruded raw yarn was drawn at a multiple draw ratio of 120°C and then wound up, with the draw ratio being 200 times the extrusion speed. The wound fiber was again drawn at a multiple draw ratio of 9 times at a high temperature, with the heating passage temperature being 125°C.

[0052] Cut resistance tests were conducted on fibers drawn at high temperatures and multiple ratios, and the cut resistance reached A5.

[0053] Example 5 Carbon fibers (length 1000 μm, diameter 20 μm) and fluorine gas were placed in a sealed reaction vessel, the fluorine gas pressure was set to 0.7-0.8 MPa, the temperature was set to 150°C, and the reaction was continued for 2 hours to obtain surface-fluorinated carbon fibers.

[0054] 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. The temperature was controlled at 70-90°C, and the mixture was blended for 1 minute each time, followed by a 30-second pause, for a total mixing time of approximately 10 minutes, to obtain the processed mixed fiber.

[0055] Obtained by polymerization using a late transition metal catalyst, it has a weight-average molecular weight of 400,000, a Mw / Mn of 2.4, a methyl group count per 1000 carbon atoms of less than 0.1, and a density of 0.941 g / cm. 3 The polyethylene, the treated mixed fiber, stearic acid, calcium stearate, and antioxidant 1010 were blended in a ratio of 94:5:0.3:0.4:0.3, and the blending time was 3 minutes to obtain a raw material.

[0056] The raw materials were fed to a screw extruder and melt-extruded. The temperature from the material feed section to the material discharge section of the twin screw was 145 to 200°C, the rotation speed was 220 rpm, and the hole diameter of the extrusion die was 10 mm.

[0057] The extruded raw yarn was drawn at a multiple draw ratio of 150°C and then wound up, with the draw ratio being 600 times the extrusion speed. The wound fiber was again drawn at a multiple draw ratio of 15 times at a high temperature, with the heating passage temperature being 130°C.

[0058] Cut resistance tests were conducted on fibers drawn at high temperatures and multiple ratios, and the cut resistance reached A6.

[0059] (Comparative Example 1) Obtained by polymerization using a late transition metal catalyst, it has a weight average molecular weight of 150,000, Mw / Mn of 2.8, methyl groups per 1,000 carbon atoms of less than 0.1, and a density of 0.945 g / cm. 3 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.

[0060] The raw materials were fed to a screw extruder and melt-extruded. The temperature from the material feed section to the material discharge section of the twin screw was 145 to 180°C, the rotation speed was 90 rpm, and the hole diameter of the extrusion die was 0.5 mm.

[0061] The extruded raw yarn was drawn at a multiple draw ratio of 80°C and then wound up, with a draw ratio of 400 times the extrusion speed, and the cooling temperature and medium after drawing were air at 20°C. The wound fiber was again drawn at a multiple draw ratio of 7 times at a heating path temperature of 100°C.

[0062] Cut resistance tests were conducted on fibers drawn at high temperatures and multiple ratios, and the cut resistance reached A1.

[0063] (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. The temperature was controlled at 70-90°C, and the mixture was blended for 1 minute each time, followed by a 30-second pause, for a total mixing time of approximately 10 minutes, to obtain treated glass fiber.

[0064] Obtained by polymerization using a late transition metal catalyst, it has a weight average molecular weight of 150,000, Mw / Mn of 2.8, methyl groups per 1,000 carbon atoms of less than 0.1, and a density of 0.945 g / cm. 3 The polyethylene was blended with the 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.

[0065] The raw materials were fed to a screw extruder and melt-extruded. The temperature from the material feed section to the material discharge section of the twin screw was 145 to 180°C, the rotation speed was 90 rpm, and the hole diameter of the extrusion die was 0.5 mm.

[0066] The extruded raw yarn was drawn at a multiple draw ratio of 80°C and then wound up, with the draw ratio set to 40 times the extrusion speed, and the cooling temperature and medium after drawing was air at 20°C. The wound fiber was again drawn at a multiple draw ratio of 7 times at a heating path temperature of 100°C.

[0067] Cut resistance tests were conducted on fibers drawn at high temperatures and multiple ratios, and the cut resistance reached A3.

[0068] (Comparative Example 3) Obtained by polymerization using a late transition metal catalyst, it has a weight average molecular weight of 150,000, Mw / Mn of 2.8, methyl groups per 1,000 carbon atoms of less than 0.1, and a density of 0.945 g / cm. 3 Polyethylene was taken. 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.

[0069] The raw materials were fed to a screw extruder and melt-extruded. The temperature from the material feed section to the material discharge section of the twin screw was 145 to 180°C, the rotation speed was 90 rpm, and the hole diameter of the extrusion die was 0.5 mm.

[0070] The extruded raw yarn was drawn at a multiple draw ratio at 80°C and then wound up. When the draw ratio was set to 180 times the extrusion speed, the yarn broke.

[0071] 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. The temperature was controlled at 70-90°C, and the mixture was blended for 1 minute each time, followed by a 30-second pause, for a total mixing time of approximately 10 minutes, to obtain treated glass fiber.

[0072] Obtained by polymerization using a late transition metal catalyst, it has a weight-average molecular weight of 150,000, a Mw / Mn of 5.4, a methyl group count per 1,000 carbon atoms of less than 0.1, and a density of 0.952 g / cm. 3The polyethylene was blended with the 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.

[0073] The raw materials were fed to a screw extruder and melt-extruded. The temperature from the material feed section to the material discharge section of the twin screw was 145 to 180°C, the rotation speed was 90 rpm, and the hole diameter of the extrusion die was 0.5 mm.

[0074] The extruded raw yarn was drawn at a multiple draw ratio at 80°C and then wound up. When the draw ratio was set to 180 times the extrusion speed, the yarn broke.

[0075] (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. The temperature was controlled at 70-90°C, and the mixture was blended for 1 minute each time, followed by a 30-second pause, for a total mixing time of approximately 10 minutes, to obtain treated glass fiber.

[0076] Obtained by polymerization using a late transition metal catalyst, it has a weight-average molecular weight of 150,000, a Mw / Mn of 5.4, a methyl group count per 1,000 carbon atoms of less than 0.1, and a density of 0.952 g / cm. 3 The polyethylene was blended with the 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.

[0077] The raw materials were fed to a screw extruder and melt-extruded. The temperature from the material feed section to the material discharge section of the twin screw was 145 to 180°C, the rotation speed was 90 rpm, and the hole diameter of the extrusion die was 0.5 mm.

[0078] The extruded raw yarn was drawn at a multiple ratio at 80°C and then wound up, with the draw ratio set to 30 times the extrusion speed, and the cooling temperature and medium after drawing was air at 20°C. The wound fiber was again drawn at a multiple ratio at a high temperature, with the draw ratio set to 4 times and the heating path temperature set to 100°C.

[0079] Cut resistance tests were conducted on fibers drawn at high temperatures and multiple ratios, and the cut resistance reached A3.

[0080] (Comparative Example 6) A method for producing abrasion-resistant and cut-resistant ultra-high molecular weight polyethylene fibers was developed by adding 0.5 parts Silane KH550 coupling agent, 5 parts nanosilica, 6 parts basalt short fiber, 0.2 parts sodium stearate, 0.2 parts pentaerythritol tetrakis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], and 0.8 parts nanodispersant VK-01 to 1,000 parts white oil. The mixture was then processed in a high-speed emulsifier at 8,000 rpm for 4 hours at a temperature of 60°C to form a mother liquor. The mother liquor had 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 / cm. 3 80 parts of the resin raw material was added to a ball mill and the temperature was controlled at 50°C. The mother liquor was then gradually added to the ball mill at a rate of 2 parts / min and stirred until uniform. The mixture was then vacuumed in a sealed container for 4 hours. The 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, and then wound up to obtain fibers. The fibers were tested and found to have a cut resistance level of A3.

[0081] [Table 1]

[0082] As can be seen from the table above, blending polyethylene with treated inorganic fibers results in 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 exceeding 180x. When the draw ratio in the molten state exceeds 180x, the cut resistance of the fiber product is again improved, reaching A5 to A6 levels.

[0083] The cut-resistant fibers produced by this method are far superior in cost, process complexity, and environmental performance to solution dissolution and current melt extrusion methods for producing high performance fibers, and their cut resistance is also superior to solution-processed ultra-high molecular weight polyethylene cut-resistant fiber products.

[0084] The above-described description of the embodiments is intended to facilitate understanding and use of the invention by those skilled in the art. Those skilled in the art can easily make various modifications to these embodiments and can apply the general principles described herein to other embodiments without creative effort. Therefore, the present invention is not limited to the above-described embodiments. 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

1. 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.

2. 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.

3. 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.

4. 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.

5. 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.

6. 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.

7. 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.

8. 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.

9. 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.

10. A cut-resistant fiber obtained by the method according to any one of claims 1 to 9.

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