A kind of cutting-resistant polypropylene fiber and preparation method thereof

Abstract

The present invention discloses a cut-resistant polypropylene fiber and a preparation method thereof, the method comprising: step 1, weighing various raw materials for preparing graphene-modified hard composite material powder in proportion, including graphene, a modifier, and a hard material; step 2, preparing graphene-modified hard composite material powder; step 3, uniformly mixing the composite material powder obtained in step 2 with polypropylene powder, and dispersing by ball milling; step 4, melt-blending the mixture obtained in step 3, and then spinning to obtain the cut-resistant polypropylene fiber. The present invention also provides the cut-resistant polypropylene fiber prepared by the method. The fiber prepared by the present invention has high breaking strength and cut resistance, expands the application range of traditional polypropylene, can improve the added value of the product, and the gloves woven with the cut-resistant polypropylene fiber can have a cut resistance level of more than European standard level 4.

Description

Technical Field

[0001] The present invention relates to a cutting-resistant graphene polypropylene composite fiber and a preparation method thereof in the technical field of novel functional polymer materials, and in particular to a cutting-resistant polypropylene fiber and a preparation method thereof. Background Art

[0002] Graphene is a single-layer carbon atom material peeled off from graphite. It is a single-layer two-dimensional honeycomb lattice structure made of carbon atoms tightly stacked. It is the thinnest, hardest and most conductive material known to mankind. Graphene has excellent mechanical, optical and electrical properties, and its structure is very stable. So far, researchers have not found any missing carbon atoms in graphene. The links between carbon atoms are very flexible, harder than diamonds, and 100 times stronger than the best steel in the world. If graphene is used to make packaging bags, it will be able to withstand about two tons of objects. It is almost completely transparent, but extremely dense, impermeable to water and air. Even helium, the smallest atom, cannot pass through it. It has good conductivity. The speed of electrons in graphene reaches 1 / 300 of the speed of light. The conductivity exceeds that of any traditional conductive material. The chemical properties are similar to those of graphite surface. It can adsorb and desorb various atoms and molecules, and has the ability to resist strong acids and alkalis. As a new material with excellent performance, the application field of graphene needs to be further developed and expanded.

[0003] Polypropylene fiber is a chemical fiber with low cost, good performance and extremely wide application, but traditional polypropylene fiber does not have functionality. With the development of society, traditional polypropylene can no longer meet people's demand for functional textiles. Summary of the invention

[0004] The purpose of the present invention is to provide a cut-resistant graphene polypropylene composite fiber and a preparation method thereof. The prepared fiber has excellent cut-resistant performance, can broaden the application field of polypropylene fiber, and gloves woven with the cut-resistant polypropylene fiber can have a cut-resistant grade of above European standard grade 4.

[0005] In order to achieve the above-mentioned object, the present invention provides a method for preparing cut-resistant polypropylene fiber, wherein the method comprises: step 1, weighing various raw materials for preparing graphene-modified hard composite material powder, including graphene, modifier, and hard material in proportion; step 2, preparing graphene-modified hard composite material powder; step 3, mixing the composite material powder obtained in step 2 with polypropylene powder evenly, and dispersing them by ball milling; step 4, melt-blending the mixture obtained in step 3, and then obtaining the cut-resistant polypropylene fiber by spinning.

[0006] The above-mentioned method for preparing cut-resistant polypropylene fiber, wherein, in the step 1, the raw materials for preparing the graphene-modified hard composite material powder are composed of graphene, modifier, and hard material in a mass ratio of 1: (0.3-0.8): (1-5).

[0007] The above-mentioned method for preparing cut-resistant polypropylene fiber, wherein the hard material is any one or more of carbon fiber, glass fiber, and ultra-high molecular weight polyethylene fiber; the fiber diameter of the hard material is 3 to 10 μm, and the aspect ratio is 9 to 15.

[0008] In the above-mentioned method for preparing cut-resistant polypropylene fiber, the modifier is a surfactant or a silane coupling agent.

[0009] The preparation method of the above-mentioned cut-resistant polypropylene fiber, wherein, in the step 2, the powder of the hard material and the powder of the graphene and the modifier are added to deionized water, and the mass concentration of the graphene is 0.1-1% after uniform mixing, and the obtained solution is ultrasonically dispersed for 2-5 hours, and then mechanically stirred for 1-3 hours at a temperature of 15-50°C, and then centrifuged, washed, and dried to obtain a graphene-modified hard composite material powder.

[0010] The above-mentioned method for preparing cut-resistant polypropylene fiber, wherein, in the step 3, the composite material powder and the polypropylene powder are evenly mixed, added into the solvent at a mass percentage of 1-5%, ball milled and dispersed for 1-5 hours, and then the obtained mixture powder is dried; the solvent is any one or more of decalin, sorbitol, and paraffin oil.

[0011] In the above-mentioned method for preparing cut-resistant polypropylene fiber, the content of the composite material powder in the mixture with the polypropylene powder is 1-5% by mass.

[0012] In the above-mentioned method for preparing cut-resistant polypropylene fiber, the polypropylene powder has a melt index of 30-40 g / 10 min.

[0013] The above-mentioned method for preparing cut-resistant polypropylene fiber, wherein, in the step 4, the mixture is added to a twin-screw extruder, melt blended and then spun, the feed rate is 15-30r / min, the screw speed is 30-70r / min, and the processing temperature is 180-243°C.

[0014] The present invention also provides cut-resistant polypropylene fibers prepared by the above method, wherein the cut-resistant polypropylene fibers have a crystallinity greater than 70%, a breaking strength of 3.1-4.5 cN / dtex, and a creep rate less than 4%.

[0015] The cut-resistant polypropylene fiber and preparation method thereof provided by the present invention have the following advantages:

[0016] The cut-resistant polypropylene fiber graphene composite hard material prepared by the present invention can be arranged in an orderly and consistent direction in the fiber body, thereby enhancing the cutting performance of the fiber. The cut-resistant grade of gloves woven with the cut-resistant polypropylene fiber can reach above European standard grade 4.

[0017] The graphene modified by the modifier in the present invention not only has excellent composite performance with hard materials, but also has better improved dispersion ability in the molten system and reduced agglomeration.

[0018] The cut-resistant polypropylene fiber prepared by the invention has excellent mechanical properties, high breaking strength and cut-resistant performance, and excellent tensile properties in both the transverse and longitudinal directions of the fiber, thus expanding the application range of the polypropylene fiber. DETAILED DESCRIPTION

[0019] The specific embodiments of the present invention are further described below.

[0020] The method for preparing a cut-resistant polypropylene fiber provided by the present invention comprises: step 1, weighing raw materials for preparing graphene-modified hard composite material powder, including graphene, a modifier and a hard material, in proportion; step 2, preparing graphene-modified hard composite material powder; step 3, uniformly mixing the composite material powder obtained in step 2 with polypropylene powder, and dispersing them by ball milling; and step 4, melt-blending the mixture obtained in step 3, and then spinning to obtain the cut-resistant polypropylene fiber.

[0021] Preferably, in step 1, the raw materials for preparing the graphene-modified hard composite material powder are composed of graphene, modifier, and hard material in a mass ratio of 1:(0.3-0.8):(1-5).

[0022] The hard material is any one or more of carbon fiber, glass fiber, ultra-high molecular weight polyethylene fiber, etc.; the fiber diameter of the hard material is 3-10 μm, and the aspect ratio is 9-15.

[0023] The modifier is a surfactant or a silane coupling agent. The specific composition of the surfactant or the product model used can be determined according to appropriate selection known to those skilled in the art, such as polyethylene glycol, sodium lignin sulfonate, polyvinyl pyrrolidone, sodium dodecyl sulfonate, etc.

[0024] Step 2: Add the powder of the hard material, the powder of the graphene and the modifier into deionized water, mix them evenly until the mass concentration of the graphene is 0.1-1%, ultrasonically disperse the resulting solution for 2-5 hours, mechanically stir it for 1-3 hours at a temperature of 15-50° C., and then centrifuge, wash and dry to obtain a graphene-modified hard composite material powder.

[0025] Step 3, mix the composite material powder and the polypropylene powder evenly, add 1-5% by mass into the solvent, disperse by ball milling for 1-5 hours, then remove the solvent and dry the obtained mixture powder; the solvent is any one or more of decalin, sorbitol and paraffin oil.

[0026] The content of the composite material powder in the mixture of the composite material powder and the polypropylene powder is 1-5% by mass.

[0027] The melt index of the polypropylene powder is 30-40 g / 10 min.

[0028] Step 4, adding the mixture into a twin-screw extruder, spinning after melt blending, the feed rate is 15-30r / min, the screw speed is 30-70r / min, and the processing temperature is 180-243°C.

[0029] The equipment and other process conditions used in the present invention are known to those skilled in the art.

[0030] The invention also provides cut-resistant polypropylene fiber prepared by the method, wherein the fiber has a crystallinity greater than 70%, a breaking strength of 3.1-4.5 cN / dtex, and a creep rate less than 4%.

[0031] The cut-resistant polypropylene fiber and the preparation method thereof provided by the present invention are further described below in conjunction with embodiments.

[0032] Example 1

[0033] A method for preparing cut-resistant polypropylene fiber, comprising:

[0034] Step 1: weigh various raw materials for preparing graphene-modified hard composite material powder, including graphene, modifier, and hard material, according to proportion.

[0035] Preferably, the raw materials for preparing the graphene-modified hard composite material powder are composed of graphene, modifier and hard material in a mass ratio of 1:0.8:5.

[0036] The hard material is any one of carbon fiber, glass fiber, and ultra-high molecular weight polyethylene fiber; the fiber diameter of the hard material is 3 μm, and the aspect ratio is 9.

[0037] The modifier is a surfactant or a silane coupling agent.

[0038] Step 2: prepare graphene-modified hard composite material powder.

[0039] Preferably, the powder of the hard material and the powder of the graphene and the modifier are added to deionized water, and after uniform mixing, the mass concentration of the graphene is 0.1%. The resulting solution is ultrasonically dispersed for 5 hours, and then mechanically stirred for 3 hours at a temperature of 50°C, and then centrifuged, washed, and dried to obtain a graphene-modified hard composite material powder.

[0040] Step 3, the composite material powder obtained in step 2 is evenly mixed with the polypropylene powder, and dispersed by ball milling.

[0041] Preferably, the composite material powder and the polypropylene powder are uniformly mixed, added into the solvent at a mass percentage of 5%, ball-milled and dispersed for 5 hours, and then the solvent is removed and the obtained mixture powder is dried; the solvent is decalin.

[0042] The content of the composite material powder in the mixture of the composite material powder and the polypropylene powder is 5% by mass.

[0043] The melt index of the polypropylene powder is 40 g / 10 min.

[0044] Step 4, melt-blending the mixture obtained in step 3, and then spinning to obtain cut-resistant polypropylene fibers.

[0045] Preferably, the mixture is added to a twin-screw extruder, melt blended and then spun, with a feed rate of 30 r / min, a screw speed of 70 r / min, and a processing temperature of 243°C.

[0046] This embodiment also provides cut-resistant polypropylene fiber prepared by the method.

[0047] Example 2

[0048] A method for preparing cut-resistant polypropylene fiber, comprising:

[0049] Step 1: weigh various raw materials for preparing graphene-modified hard composite material powder, including graphene, modifier, and hard material, according to proportion.

[0050] Preferably, the raw materials for preparing the graphene-modified hard composite material powder are composed of graphene, modifier and hard material in a mass ratio of 1:0.6:4.

[0051] The hard material is any one of carbon fiber, glass fiber, and ultra-high molecular weight polyethylene fiber; the fiber diameter of the hard material is 10 μm and the aspect ratio is 15.

[0052] The modifier is a silane coupling agent.

[0053] Step 2: prepare graphene-modified hard composite material powder.

[0054] Preferably, the powder of the hard material and the powder of the graphene and the modifier are added to deionized water, and after uniform mixing, the mass concentration of the graphene is 0.4%. The resulting solution is ultrasonically dispersed for 4 hours, and then mechanically stirred for 2.5 hours at a temperature of 45°C, and then centrifuged, washed, and dried to obtain a graphene-modified hard composite material powder.

[0055] Step 3, the composite material powder obtained in step 2 is evenly mixed with the polypropylene powder, and dispersed by ball milling.

[0056] Preferably, the composite material powder and the polypropylene powder are uniformly mixed, added into the solvent at a mass percentage of 4%, ball-milled and dispersed for 4 hours, and then the solvent is removed and the obtained mixture powder is dried; the solvent is sorbitol.

[0057] The content of the composite material powder in the mixture of the composite material powder and the polypropylene powder is 4% by mass.

[0058] The melt index of the polypropylene powder is 40 g / 10 min.

[0059] Step 4, melt-blending the mixture obtained in step 3, and then spinning to obtain cut-resistant polypropylene fibers.

[0060] Preferably, the mixture is added to a twin-screw extruder, melt blended and then spun, with a feed rate of 25 r / min, a screw speed of 60 r / min, and a processing temperature of 230°C.

[0061] This embodiment also provides cut-resistant polypropylene fiber prepared by the method.

[0062] Example 3

[0063] A method for preparing cut-resistant polypropylene fiber, comprising:

[0064] Step 1: weigh various raw materials for preparing graphene-modified hard composite material powder, including graphene, modifier, and hard material, according to proportion.

[0065] Preferably, the raw materials for preparing the graphene-modified hard composite material powder are composed of graphene, modifier and hard material in a mass ratio of 1:0.5:3.

[0066] The hard material is ultra-high molecular weight polyethylene fiber; the fiber diameter of the hard material is 5 μm, and the aspect ratio is 12. The modifier is a silane coupling agent.

[0067] Step 2: prepare graphene-modified hard composite material powder.

[0068] Preferably, the powder of the hard material and the powder of the graphene and the modifier are added to deionized water, and after uniform mixing, the mass concentration of the graphene is 0.5%. The resulting solution is ultrasonically dispersed for 3 hours, and then mechanically stirred for 2 hours at a temperature of 35°C, and then centrifuged, washed, and dried to obtain a graphene-modified hard composite material powder.

[0069] Step 3, the composite material powder obtained in step 2 is evenly mixed with the polypropylene powder, and dispersed by ball milling.

[0070] Preferably, the composite material powder and the polypropylene powder are uniformly mixed, added into the solvent at a mass percentage of 3%, ball-milled and dispersed for 3 hours, and then the solvent is removed and the obtained mixture powder is dried; the solvent is paraffin oil.

[0071] The content of the composite material powder in the mixture of the composite material powder and the polypropylene powder is 3% by mass.

[0072] The melt index of the polypropylene powder was 35 g / 10 min.

[0073] Step 4, melt-blending the mixture obtained in step 3, and then spinning to obtain cut-resistant polypropylene fibers.

[0074] Preferably, the mixture is added to a twin-screw extruder, melt blended and then spun, with a feed rate of 20 r / min, a screw speed of 40 r / min, and a processing temperature of 220°C.

[0075] This embodiment also provides cut-resistant polypropylene fiber prepared by the method.

[0076] Example 4

[0077] A method for preparing cut-resistant polypropylene fiber, comprising:

[0078] Step 1: weigh various raw materials for preparing graphene-modified hard composite material powder, including graphene, modifier, and hard material, according to proportion.

[0079] Preferably, the raw materials for preparing the graphene-modified hard composite material powder are composed of graphene, modifier and hard material in a mass ratio of 1:0.4:2.

[0080] The hard material is glass fiber; the fiber diameter of the hard material is 8 μm, and the aspect ratio is 10. The modifier is a surfactant.

[0081] Step 2: prepare graphene-modified hard composite material powder.

[0082] Preferably, the powder of the hard material and the powder of the graphene and the modifier are added to deionized water, and after uniform mixing, the mass concentration of the graphene is 0.8%. The resulting solution is ultrasonically dispersed for 2.5 hours, and then mechanically stirred for 1.5 hours at a temperature of 25°C, and then centrifuged, washed, and dried to obtain a graphene-modified hard composite material powder.

[0083] Step 3, the composite material powder obtained in step 2 is evenly mixed with the polypropylene powder, and dispersed by ball milling.

[0084] Preferably, the composite material powder and the polypropylene powder are uniformly mixed, added into the solvent at a mass percentage of 2%, ball-milled and dispersed for 2 hours, and then the solvent is removed and the obtained mixture powder is dried; the solvent is any one of decalin, sorbitol and paraffin oil.

[0085] The content of the composite material powder in the mixture of the composite material powder and the polypropylene powder is 2% by mass.

[0086] The melt index of the polypropylene powder is 30 g / 10 min.

[0087] Step 4, melt-blending the mixture obtained in step 3, and then spinning to obtain cut-resistant polypropylene fibers.

[0088] Preferably, the mixture is added to a twin-screw extruder, melt blended and then spun, with a feed rate of 18 r / min, a screw speed of 50 r / min, and a processing temperature of 200°C.

[0089] This embodiment also provides cut-resistant polypropylene fiber prepared by the method.

[0090] Example 5

[0091] A method for preparing cut-resistant polypropylene fiber, comprising:

[0092] Step 1: weigh various raw materials for preparing graphene-modified hard composite material powder, including graphene, modifier, and hard material, according to proportion.

[0093] Preferably, the raw materials for preparing the graphene-modified hard composite material powder are composed of graphene, modifier and hard material in a mass ratio of 1:0.3:1.

[0094] The hard material is carbon fiber; the fiber diameter of the hard material is 4 μm, and the aspect ratio is 14. The modifier is a surfactant.

[0095] Step 2: prepare graphene-modified hard composite material powder.

[0096] Preferably, the powder of the hard material and the powder of the graphene and the modifier are added to deionized water, and after uniform mixing, the mass concentration of the graphene is 1%. The resulting solution is ultrasonically dispersed for 2 hours, and then mechanically stirred for 1 hour at a temperature of 15°C, and then centrifuged, washed, and dried to obtain a graphene-modified hard composite material powder.

[0097] Step 3, the composite material powder obtained in step 2 is evenly mixed with the polypropylene powder, and dispersed by ball milling.

[0098] Preferably, the composite material powder and the polypropylene powder are uniformly mixed, added into the solvent at 1% by mass, dispersed by ball milling for 1 hour, and then the solvent is removed and the obtained mixture powder is dried; the solvent is any one of decalin, sorbitol and paraffin oil.

[0099] The content of the composite material powder in the mixture of the composite material powder and the polypropylene powder is 1% by mass.

[0100] The melt index of the polypropylene powder is 30 g / 10 min.

[0101] Step 4, melt-blending the mixture obtained in step 3, and then spinning to obtain cut-resistant polypropylene fibers.

[0102] Preferably, the mixture is added to a twin-screw extruder, melt blended and then spun, with a feed rate of 15 r / min, a screw speed of 30 r / min, and a processing temperature of 180°C.

[0103] This embodiment also provides cut-resistant polypropylene fiber prepared by the method.

[0104] Comparative Example 1

[0105] A method for preparing cut-resistant polypropylene fiber, comprising:

[0106] Step 1, weighing various raw materials for preparing graphene modified material powder, including graphene and modifier, according to proportion.

[0107] Preferably, the raw material consists of graphene and modifier in a mass ratio of 1:0.3.

[0108] The modifier is a surfactant or a silane coupling agent.

[0109] Step 2: prepare graphene modified material powder.

[0110] Preferably, the graphene and modifier powders are mixed and then ultrasonically dispersed for 5 hours, then mechanically stirred at 50° C. for 3 hours, and then centrifuged, washed, and dried to obtain graphene modified material powder.

[0111] Step 3, the material powder obtained in step 2 is evenly mixed with the polypropylene powder, and dispersed by ball milling.

[0112] Preferably, the material powder and the polypropylene powder are uniformly mixed, added into 5% by volume ethanol, ball-milled and dispersed for 5 hours, and then the ethanol is removed and the obtained mixture powder is dried.

[0113] The content of the material powder in the mixture of the material powder and the polypropylene powder is 5% by mass.

[0114] The melt index of the polypropylene powder is 40 g / 10 min.

[0115] Step 4, melt-blending the mixture obtained in step 3, and then spinning to obtain cut-resistant polypropylene fibers.

[0116] Preferably, the mixture is added to a twin-screw extruder, melt blended and then spun, with a feed rate of 30 r / min, a screw speed of 70 r / min, and a processing temperature of 240°C.

[0117] This comparative example also provides a cut-resistant polypropylene fiber prepared by the method.

[0118] Comparative Example 2

[0119] A method for preparing cut-resistant polypropylene fiber, comprising:

[0120] Step 1, weigh hard material powder according to proportion.

[0121] The hard material is any one of carbon fiber, glass fiber, and ultra-high molecular weight polyethylene fiber; the fiber diameter of the hard material is 5 μm, and the aspect ratio is 12.

[0122] Step 2: Ultrasonic dispersion of the hard material powder for 2 hours, mechanical stirring at 15° C. for 1 hour, and then centrifugation, washing, and drying.

[0123] Step 3, mixing the hard material powder obtained in step 2 with the polypropylene powder evenly, and dispersing them by ball milling.

[0124] Preferably, the hard material powder and the polypropylene powder are uniformly mixed, added into 1% by volume ethanol, ball-milled and dispersed for 1 hour, and then the ethanol is removed and the obtained mixture powder is dried.

[0125] The content of the hard material powder in the mixture of the hard material powder and the polypropylene powder is 1% by mass.

[0126] The melt index of the polypropylene powder is 30 g / 10 min.

[0127] Step 4, melt-blending the mixture obtained in step 3, and then spinning to obtain cut-resistant polypropylene fibers.

[0128] Preferably, the mixture is added to a twin-screw extruder, melt blended and then spun, with a feed rate of 15 r / min, a screw speed of 30 r / min, and a processing temperature of 180°C.

[0129] This comparative example also provides a cut-resistant polypropylene fiber prepared by the method.

[0130] The composite fibers prepared in the examples and comparative examples were subjected to EN388 cut resistance test, and the test data are shown in Table 1 below.

[0131] Table 1. Experimental results.

[0132]

[0133] The composite fibers prepared in the embodiments of the present invention have a crystallinity greater than 70%, a breaking strength of 3.1-4.5 cN / dtex, and a creep rate less than 4%. The crystallinity of the fiber in the comparative example is 50%, and the breaking strength is less than 2.5 cN / dtex. It can be seen that the present invention increases the nucleation sites of the polypropylene fiber by adding graphene, which is beneficial to the improvement of crystallinity and strength.

[0134] The key technology of the cut-resistant polypropylene fiber prepared by the present invention is to prepare graphene-modified hard composite material powder so that the graphene composite hard material can be arranged in the fiber body in an orderly direction, thereby enhancing the cutting performance of the fiber. The obtained cut-resistant polypropylene fiber has excellent mechanical properties, high breaking strength and cut resistance, and expands the application range of traditional polypropylene, which can increase the added value of the product. The gloves woven with the cut-resistant polypropylene fiber can achieve a cut resistance level of European standard (EN388 cut resistance test) or above level 4.

[0135] Although the content of the present invention has been described in detail through the above preferred embodiments, it should be appreciated that the above description should not be considered as a limitation of the present invention. After reading the above content, it will be apparent to those skilled in the art that various modifications and substitutions of the present invention will occur. Therefore, the protection scope of the present invention should be limited by the appended claims.

Claims

1. A method for preparing cut-resistant polypropylene fiber, characterized in that: The method comprises: Step 1, weighing various raw materials for preparing graphene-modified hard composite material powder according to proportion, including graphene, modifier, and hard material; Step 2, preparing graphene-modified hard composite material powder; Step 3, mixing the composite material powder obtained in step 2 with the polypropylene powder evenly, and dispersing them by ball milling; Step 4, melt-blending the mixture obtained in step 3, and then spinning to obtain cut-resistant polypropylene fibers; In the step 1, the raw materials for preparing the graphene-modified hard composite material powder are composed of graphene, a modifier, and a hard material in a mass ratio of 1: (0.3-0.8): (1-5); The hard material is any one or more of carbon fiber, glass fiber, and ultra-high molecular weight polyethylene fiber, and the fiber diameter of the hard material is 3 to 10 μm, and the aspect ratio is 9 to 15; The modifier is a surfactant or a silane coupling agent; In the step 2, the powder of the hard material and the powder of the graphene and the modifier are added to deionized water, and after uniform mixing, the mass concentration of the graphene is 0.1-1%, the obtained solution is ultrasonically dispersed for 2-5 hours, and then mechanically stirred for 1-3 hours at a temperature of 15-50°C, and then centrifuged, washed, and dried to obtain a graphene-modified hard composite material powder.

2. The method for preparing the cut-resistant polypropylene fiber according to claim 1, characterized in that: In the step 3, the composite material powder and the polypropylene powder are evenly mixed, added into a solvent at a mass percentage of 1-5%, ball milled and dispersed for 1-5 hours, and then the obtained mixture is dried; the solvent is any one or more of decalin, sorbitol, and paraffin oil.

3. The method for preparing the cut-resistant polypropylene fiber according to claim 2, characterized in that: The content of the composite material powder in the mixture of polypropylene powder is 1-5% by mass.

4. The method for preparing the cut-resistant polypropylene fiber according to claim 2, characterized in that: The polypropylene powder has a melting index of 30-40.

5. The method for preparing the cut-resistant polypropylene fiber according to claim 1, characterized in that: In the step 4, the mixture is added into a twin-screw extruder, melt blended and then spun, the feed rate is 15-30r / min, the screw speed is 30-70r / min, and the processing temperature is 180-243°C.

6. A cut-resistant polypropylene fiber prepared by the method according to any one of claims 1 to 5, characterized in that: The cut-resistant polypropylene fiber has a crystallinity greater than 70%, a breaking strength of 3.1-4.5 cN / dtex, and a creep rate less than 4%.

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