阅读说明：本技术 一种耐切割石墨烯改性碳纤维长丝及其制备方法 (Cutting-resistant graphene modified carbon fiber filament and preparation method thereof ) 是由 沙嫣 沙晓林 马立国 于 2021-07-22 设计创作，主要内容包括：本发明公开了一种耐切割石墨烯改性碳纤维长丝及其制备方法,该方法包含：步骤1,称取各原料；步骤2,将功能化石墨烯粉末分散于溶剂中,形成石墨烯分散液；步骤3,将碳纤维前驱体分散于溶剂中,形成碳纤维前驱体溶液；步骤4,将石墨烯分散液和碳纤维前驱体溶液共混均匀,形成石墨烯改性的碳纤维前驱体溶液；步骤5,以前驱体溶液作为纺丝原液,经纺丝制成石墨烯改性的碳纤维前驱体原丝；步骤6,对前驱体原丝进行预氧化处理,之后在保护性气氛中进行碳化处理,制得石墨烯改性复合碳纤维。本发明还提供了通过该方法制备的耐切割石墨烯改性碳纤维长丝。本发明制备的复合纤维综合性能优异,耐切割效果好,具有广阔的应用前景。(The invention discloses a cutting-resistant graphene modified carbon fiber filament and a preparation method thereof, wherein the method comprises the following steps: step 1, weighing raw materials; step 2, dispersing the functionalized graphene powder in a solvent to form a graphene dispersion liquid; step 3, dispersing the carbon fiber precursor in a solvent to form a carbon fiber precursor solution; step 4, uniformly blending the graphene dispersion liquid and the carbon fiber precursor solution to form a graphene-modified carbon fiber precursor solution; step 5, taking the precursor solution as a spinning stock solution, and spinning to prepare a graphene modified carbon fiber precursor; and 6, pre-oxidizing the precursor, and then carbonizing in a protective atmosphere to obtain the graphene modified composite carbon fiber. The invention also provides the cutting-resistant graphene modified carbon fiber filament prepared by the method. The composite fiber prepared by the invention has excellent comprehensive performance, good cutting resistance effect and wide application prospect.)

1. A preparation method of cutting-resistant graphene modified carbon fiber filaments is characterized by comprising the following steps:

step 1, weighing raw materials in proportion;

step 2, dispersing the functionalized graphene powder in a solvent to form a graphene dispersion liquid;

step 3, dispersing the carbon fiber precursor in a solvent to form a carbon fiber precursor solution;

step 4, uniformly blending the graphene dispersion liquid obtained in the step 2 and the carbon fiber precursor solution obtained in the step 3 to form a graphene-modified carbon fiber precursor solution;

step 5, taking the graphene-modified carbon fiber precursor solution obtained in the step 4 as a spinning stock solution, and spinning to prepare a graphene-modified carbon fiber precursor;

and 6, carrying out pre-oxidation treatment on the precursor of the graphene-modified carbon fiber obtained in the step 5, and then carrying out carbonization treatment in a protective atmosphere to obtain the graphene-modified composite carbon fiber.

2. The method of claim 1, wherein the solvent comprises one or more of xylene, N-dimethylformamide, N-dimethylacetamide and dimethylsulfoxide.

3. The method for preparing the cutting-resistant graphene-modified carbon fiber filament according to claim 1, wherein in the step 2, the concentration of the functionalized graphene forming the dispersion in the solvent is more than 10 wt%; active functional groups containing any one or more of sulfonic acid groups, xylene sulfonic acid groups or p-toluene sulfonic acid groups are distributed on the surface of the functionalized graphene; the number ratio of active functional groups to carbon hexacyclic rings in the functionalized graphene is 1: 1-1: 5, the average value of the sheet diameter of the functionalized graphene is 50-100 mu m, and the number of layers of the functionalized graphene is 1-2.

4. The method for preparing the cutting-resistant graphene modified carbon fiber filament according to claim 1, wherein in the step 3, a carbon fiber precursor is dispersed in a solvent, and the formed mixture is heated to 30-180 ℃ and continuously stirred to prepare a carbon fiber precursor solution; the carbon fiber precursor is pitch and/or polyacrylonitrile resin.

5. The method for preparing the cutting-resistant graphene-modified carbon fiber filament according to claim 1, wherein in the step 4, the mass ratio of the functionalized graphene to the carbon fiber precursor in the graphene-modified carbon fiber precursor solution is (0.5-5): 100.

6. the method for preparing a cut-resistant graphene-modified carbon fiber filament according to claim 5, wherein the graphene-modified carbon fiber precursor solution contains a carbon fiber precursor in a concentration of 10 wt% to 25 wt%.

7. The method for preparing the cutting-resistant graphene modified carbon fiber filament according to claim 1, wherein in the step 6, the pre-oxidation treatment is performed in an oxygen-containing atmosphere, the temperature of the pre-oxidation treatment is 200-280 ℃, and the time is 30-90 min.

8. The method for preparing the cutting-resistant graphene-modified carbon fiber filament according to claim 7, wherein in the step 6, the protective atmosphere is a nitrogen and/or helium atmosphere.

9. The method for preparing the cutting-resistant graphene modified carbon fiber filament according to claim 8, wherein in the step 6, the temperature of the carbonization treatment is 800-1200 ℃ and the time is 30-90 min.

10. A cut resistant graphene modified carbon fiber filament prepared by the method of any one of claims 1 to 9.

Technical Field

The invention relates to a graphene modified composite carbon fiber in the technical field of novel functional polymer materials and a preparation method thereof, and particularly relates to a cutting-resistant graphene modified carbon fiber filament and a preparation method thereof.

Background

Graphene is a single-layer carbon atom material stripped from graphite, and a single-layer two-dimensional honeycomb lattice structure is formed by tightly packing carbon atoms, and is known to be the material with the thinnest thickness, the hardest texture and the best conductivity. Graphene has excellent mechanical, optical and electrical properties and a very stable structure, researchers have not found that graphene has a missing carbon atom, the linkage between carbon atoms is very flexible, and is harder than diamond, the strength is 100 times higher than that of the world's best steel, if graphene is used for making a packaging bag, the graphene can bear about two tons of articles, the graphene is almost completely transparent, but is very compact, waterproof and airtight, helium gas with the minimum atomic size cannot pass through the graphene, the graphene has good conductivity, the movement speed of electrons in graphene reaches 1/300 of the light speed, the conductivity exceeds that of any traditional conductive material, the chemical properties are similar to the surface of graphite, various atoms and molecules can be adsorbed and desorbed, and the graphene also has the capability of resisting strong acid and strong alkali.

Graphene is a two-dimensional material with excellent performance, and when graphene and additives are added into common fibers in a certain proportion, the cutting resistance of the composite fiber can be greatly improved.

The carbon fiber is a high-strength high-modulus fiber with the carbon content of more than 90 percent, has the characteristics of high temperature resistance, friction resistance, electric conduction, heat conduction, corrosion resistance and the like, and has the high temperature resistance property which is the first of all chemical fibers. The carbon fiber is in fibrous shape, is soft and can be processed into various fabrics, and has high strength and modulus along the fiber axis direction due to the preferred orientation of the graphite microcrystalline structure along the fiber axis. The carbon fiber is generally made of acrylic fiber and viscose fiber as raw materials and is formed by high-temperature oxidation and carbonization, and is an excellent material for manufacturing high-technology equipment such as aerospace and aviation.

Disclosure of Invention

The invention aims to provide graphene modified composite carbon fibers and a preparation method thereof, the prepared fibers are excellent in comprehensive performance, good in cutting resistance effect and wide in application prospect, and meanwhile, the preparation process is simple, good in controllability and suitable for large-scale production.

In order to achieve the above object, the present invention provides a method for preparing a cut-resistant graphene-modified carbon fiber filament, wherein the method comprises: step 1, weighing raw materials in proportion; step 2, dispersing the functionalized graphene powder in a solvent to form a graphene dispersion liquid; step 3, dispersing the carbon fiber precursor in a solvent to form a carbon fiber precursor solution; step 4, uniformly blending the graphene dispersion liquid obtained in the step 2 and the carbon fiber precursor solution obtained in the step 3 to form a graphene-modified carbon fiber precursor solution; step 5, taking the graphene-modified carbon fiber precursor solution obtained in the step 4 as a spinning stock solution, and spinning to prepare a graphene-modified carbon fiber precursor; and 6, carrying out pre-oxidation treatment on the precursor of the graphene-modified carbon fiber obtained in the step 5, and then carrying out carbonization treatment in a protective atmosphere to obtain the graphene-modified composite carbon fiber.

The preparation method of the cutting-resistant graphene modified carbon fiber filament comprises the step of preparing a solvent, wherein the solvent comprises any one or more of xylene, N-dimethylformamide, N-dimethylacetamide and dimethyl sulfoxide.

In the preparation method of the cutting-resistant graphene modified carbon fiber filament, in the step 2, the concentration of the dispersion liquid formed by the functionalized graphene in the solvent is more than 10 wt%; active functional groups containing any one or more of sulfonic acid groups, xylene sulfonic acid groups or p-toluene sulfonic acid groups are distributed on the surface of the functionalized graphene; the number ratio of active functional groups to carbon hexacyclic rings in the functionalized graphene is 1: 1-1: 5, the average value of the sheet diameter of the functionalized graphene is 50-100 mu m, and the number of layers of the functionalized graphene is 1-2.

In the preparation method of the cutting-resistant graphene modified carbon fiber filament, in the step 3, a carbon fiber precursor is dispersed in a solvent, and the formed mixture is heated to 30-180 ℃ and continuously stirred to prepare a carbon fiber precursor solution; the carbon fiber precursor is pitch and/or polyacrylonitrile resin.

In the preparation method of the cutting-resistant graphene-modified carbon fiber filament, in the step 4, the mass ratio of the functionalized graphene contained in the graphene-modified carbon fiber precursor solution to the carbon fiber precursor is (0.5-5): 100.

the preparation method of the cutting-resistant graphene modified carbon fiber filament comprises the step of preparing a graphene modified carbon fiber precursor solution, wherein the concentration of the carbon fiber precursor is 10-25 wt%.

In the preparation method of the cutting-resistant graphene modified carbon fiber filament, in the step 6, the pre-oxidation treatment is performed in an oxygen-containing atmosphere, the temperature of the pre-oxidation treatment is 200-280 ℃, and the time is 30-90 min.

In the preparation method of the cutting-resistant graphene modified carbon fiber filament, in the step 6, the protective atmosphere is nitrogen and/or helium.

In the preparation method of the cutting-resistant graphene modified carbon fiber filament, in the step 6, the temperature of the carbonization treatment is 800-1200 ℃, and the time is 30-90 min.

The invention also provides the cutting-resistant graphene modified carbon fiber filament prepared by the method.

The cutting-resistant graphene modified carbon fiber filament and the preparation method thereof provided by the invention have the following advantages:

the graphene modified composite carbon fiber has excellent comprehensive performance, wherein the tensile strength can reach 8.5GPa, the tensile modulus can reach 1080GPa, and the conductivity can reach 3.4 multiplied by 10⁶S·m^-1The heat conductivity coefficient can reach 90 W.m^-1·K^-1The method has wide application prospect in the fields of spaceflight, machinery, electronics, medical treatment, sports and the like.

The cutting-resistant graphene modified carbon fiber filament prepared by the method is simple in process, easy to operate, low in cost, high in economic benefit and suitable for large-scale industrial production.

Detailed Description

The following further describes embodiments of the present invention.

The invention provides a preparation method of a cutting-resistant graphene modified carbon fiber filament, which comprises the following steps:

step 1, weighing raw materials in proportion; step 2, dispersing the functionalized graphene powder in a solvent to form a graphene dispersion liquid; step 3, dispersing the carbon fiber precursor in a solvent to form a carbon fiber precursor solution; step 4, uniformly blending the graphene dispersion liquid obtained in the step 2 and the carbon fiber precursor solution obtained in the step 3 to form a graphene-modified carbon fiber precursor solution; step 5, taking the graphene modified carbon fiber precursor solution obtained in the step 4 as a spinning stock solution, and preparing a graphene modified carbon fiber precursor by a spinning process; and 6, carrying out pre-oxidation treatment on the precursor of the graphene-modified carbon fiber obtained in the step 5, and then carrying out carbonization treatment in a protective atmosphere to obtain the graphene-modified composite carbon fiber.

The solvent contains any one or more of xylene, N-dimethylformamide, N-dimethylacetamide, dimethylsulfoxide, and the like.

In the step 2, the concentration of the dispersion liquid formed by the functionalized graphene in the solvent is more than 10 wt%; active functional groups containing any one or more of sulfonic acid groups, xylene sulfonic acid groups or p-toluene sulfonic acid groups are distributed on the surface of the functionalized graphene; the number ratio of the active functional groups to the carbon hexacyclic rings in the functionalized graphene is 1: 1-1: 5, preferably 1: 1-1: 3; the average value of the sheet diameter of the functionalized graphene is 50-100 mu m, and the number of layers of the functionalized graphene is 1-2.

In step 3, dispersing the carbon fiber precursor in a solvent, heating the formed mixture to 30-180 ℃, preferably to 90-110 ℃, and continuously stirring to prepare a carbon fiber precursor solution; the carbon fiber precursor is pitch and/or polyacrylonitrile resin.

In the step 4, the mass ratio of the functionalized graphene contained in the graphene-modified carbon fiber precursor solution to the carbon fiber precursor is (0.5-5): 100, preferably (0.5-2): 100.

the concentration of the carbon fiber precursor contained in the graphene-modified carbon fiber precursor solution is 10 wt% -25 wt%, preferably 18 wt% -22 wt%.

In the step 6, the pre-oxidation treatment is carried out in an oxygen-containing atmosphere, the temperature of the pre-oxidation treatment is 200-280 ℃, and the time is 30-90 min.

Preferably, the pre-oxidation treatment is carried out in air at 240-260 ℃ for 55-65 min.

In step 6, the protective atmosphere is a nitrogen and/or helium atmosphere.

In step 6, the temperature of the carbonization treatment is 800-1200 ℃, and the time is 30-90 min. Preferably, the temperature of the carbonization treatment is 1000-1100 ℃, and the time is 70-80 min.

The spinning process is carried out using process conditions existing in the art.

The equipment used in the present invention is known to those skilled in the art.

The invention also provides the cutting-resistant graphene modified carbon fiber filament prepared by the method.

The cutting-resistant graphene modified carbon fiber filament and the preparation method thereof provided by the invention are further described below with reference to the examples.

Example 1

A method for preparing a cut-resistant graphene-modified carbon fiber filament, comprising:

step 1, weighing the raw materials in proportion.

And 2, dispersing the functionalized graphene powder in a solvent to form a graphene dispersion liquid.

The concentration of the functionalized graphene in the solvent to form a dispersion is more than 10 wt%; sulfonic acid groups are distributed on the surface of the functionalized graphene; the number ratio of active functional groups to carbon hexacyclic rings in the functionalized graphene is 1: 2; the average value of the sheet diameter of the functionalized graphene is 50-100 mu m, and the number of layers of the functionalized graphene is 1-2.

And 3, dispersing the carbon fiber precursor in a solvent, heating the formed mixture to 90-110 ℃, and continuously stirring to obtain the carbon fiber precursor solution.

The carbon fiber precursor is pitch. The solvent comprises xylene.

And 4, uniformly blending the graphene dispersion liquid obtained in the step 2 and the carbon fiber precursor solution obtained in the step 3 to form a graphene-modified carbon fiber precursor solution.

The mass ratio of the functionalized graphene to the carbon fiber precursor in the graphene-modified carbon fiber precursor solution is 1: 100.

the concentration of the carbon fiber precursor contained in the graphene-modified carbon fiber precursor solution is 20 wt%.

And 5, taking the graphene-modified carbon fiber precursor solution obtained in the step 4 as a spinning stock solution, and preparing the graphene-modified carbon fiber precursor through a spinning process.

And 6, carrying out pre-oxidation treatment on the precursor of the graphene-modified carbon fiber obtained in the step 5, and then carrying out carbonization treatment in a protective atmosphere to obtain the graphene-modified composite carbon fiber.

The pre-oxidation treatment is carried out in the air at the temperature of 240-260 ℃ for 55-65 min.

The protective atmosphere is a nitrogen atmosphere.

The temperature of the carbonization treatment is 1000-1100 ℃, and the time is 70-80 min.

The embodiment also provides the cutting-resistant graphene modified carbon fiber filament prepared by the method.

Example 2

A method for preparing a cut-resistant graphene-modified carbon fiber filament, comprising:

step 1, weighing the raw materials in proportion.

And 2, dispersing the functionalized graphene powder in a solvent to form a graphene dispersion liquid.

The concentration of the functionalized graphene in the solvent to form a dispersion is more than 10 wt%; the functionalized graphene contains xylene sulfonic acid groups on the surface; the number ratio of active functional groups to carbon hexacyclic rings in the functionalized graphene is 1: 1; the average value of the sheet diameter of the functionalized graphene is 50-100 mu m, and the number of layers of the functionalized graphene is 1-2.

And 3, dispersing the carbon fiber precursor in a solvent, heating the formed mixture to 90-110 ℃, and continuously stirring to obtain the carbon fiber precursor solution.

The carbon fiber precursor is polyacrylonitrile resin.

The solvent comprises N, N-dimethylformamide.

And 4, uniformly blending the graphene dispersion liquid obtained in the step 2 and the carbon fiber precursor solution obtained in the step 3 to form a graphene-modified carbon fiber precursor solution.

The mass ratio of the functionalized graphene to the carbon fiber precursor in the graphene-modified carbon fiber precursor solution is 0.5: 100.

the concentration of the carbon fiber precursor contained in the graphene-modified carbon fiber precursor solution is 18 wt%.

And 5, taking the graphene-modified carbon fiber precursor solution obtained in the step 4 as a spinning stock solution, and preparing the graphene-modified carbon fiber precursor through a spinning process.

And 6, carrying out pre-oxidation treatment on the precursor of the graphene-modified carbon fiber obtained in the step 5, and then carrying out carbonization treatment in a protective atmosphere to obtain the graphene-modified composite carbon fiber.

The pre-oxidation treatment is carried out in the air at the temperature of 240-260 ℃ for 55-65 min.

The protective atmosphere is a helium atmosphere.

The temperature of the carbonization treatment is 1000-1100 ℃, and the time is 70-80 min.

The embodiment also provides the cutting-resistant graphene modified carbon fiber filament prepared by the method.

Example 3

A method for preparing a cut-resistant graphene-modified carbon fiber filament, comprising:

step 1, weighing the raw materials in proportion.

And 2, dispersing the functionalized graphene powder in a solvent to form a graphene dispersion liquid.

The concentration of the functionalized graphene in the solvent to form a dispersion is more than 10 wt%; the surface of the functionalized graphene is distributed with groups containing p-toluenesulfonic acid; the number ratio of active functional groups to carbon hexacyclic rings in the functionalized graphene is 1: 3; the average value of the sheet diameter of the functionalized graphene is 50-100 mu m, and the number of layers of the functionalized graphene is 1-2.

And 3, dispersing the carbon fiber precursor in a solvent, heating the formed mixture to 90-110 ℃, and continuously stirring to obtain the carbon fiber precursor solution.

The carbon fiber precursor is pitch and polyacrylonitrile resin.

The solvent comprises N, N-dimethylacetamide.

And 4, uniformly blending the graphene dispersion liquid obtained in the step 2 and the carbon fiber precursor solution obtained in the step 3 to form a graphene-modified carbon fiber precursor solution.

The mass ratio of the functionalized graphene to the carbon fiber precursor in the graphene-modified carbon fiber precursor solution is 2: 100.

the concentration of the carbon fiber precursor contained in the graphene-modified carbon fiber precursor solution is 22 wt%.

And 5, taking the graphene-modified carbon fiber precursor solution obtained in the step 4 as a spinning stock solution, and preparing the graphene-modified carbon fiber precursor through a spinning process.

And 6, carrying out pre-oxidation treatment on the precursor of the graphene-modified carbon fiber obtained in the step 5, and then carrying out carbonization treatment in a protective atmosphere to obtain the graphene-modified composite carbon fiber.

The pre-oxidation treatment is carried out in the air at the temperature of 240-260 ℃ for 55-65 min.

The protective atmosphere is a nitrogen or helium atmosphere.

The temperature of the carbonization treatment is 1000-1100 ℃, and the time is 70-80 min.

The embodiment also provides the cutting-resistant graphene modified carbon fiber filament prepared by the method.

Example 4

A method for preparing a cut-resistant graphene-modified carbon fiber filament, comprising:

step 1, weighing the raw materials in proportion.

And 2, dispersing the functionalized graphene powder in a solvent to form a graphene dispersion liquid.

The concentration of the functionalized graphene in the solvent to form a dispersion is more than 10 wt%; the surface of the functionalized graphene is distributed with any one active functional group containing a sulfonic acid group, a xylene sulfonic acid group or a p-toluene sulfonic acid group and the like; the number ratio of active functional groups to carbon hexacyclic rings in the functionalized graphene is 1: 4; the average value of the sheet diameter of the functionalized graphene is 50-100 mu m, and the number of layers of the functionalized graphene is 1-2.

And 3, dispersing the carbon fiber precursor in a solvent, heating the formed mixture to 30-180 ℃, and continuously stirring to obtain the carbon fiber precursor solution.

The carbon fiber precursor is pitch or polyacrylonitrile resin.

The solvent comprises dimethyl sulfoxide.

And 4, uniformly blending the graphene dispersion liquid obtained in the step 2 and the carbon fiber precursor solution obtained in the step 3 to form a graphene-modified carbon fiber precursor solution.

The mass ratio of the functionalized graphene to the carbon fiber precursor in the graphene-modified carbon fiber precursor solution is 4: 100.

the concentration of the carbon fiber precursor contained in the graphene-modified carbon fiber precursor solution was 10 wt%.

And 5, taking the graphene-modified carbon fiber precursor solution obtained in the step 4 as a spinning stock solution, and preparing the graphene-modified carbon fiber precursor through a spinning process.

And 6, carrying out pre-oxidation treatment on the precursor of the graphene-modified carbon fiber obtained in the step 5, and then carrying out carbonization treatment in a protective atmosphere to obtain the graphene-modified composite carbon fiber.

The pre-oxidation treatment is carried out in oxygen-containing atmosphere, the temperature of the pre-oxidation treatment is 200-280 ℃, and the time is 30-90 min.

The protective atmosphere is nitrogen and helium.

The temperature of the carbonization treatment is 800-1200 ℃, and the time is 30-90 min.

The embodiment also provides the cutting-resistant graphene modified carbon fiber filament prepared by the method.

Example 5

A method for preparing a cut-resistant graphene-modified carbon fiber filament, comprising:

step 1, weighing the raw materials in proportion.

And 2, dispersing the functionalized graphene powder in a solvent to form a graphene dispersion liquid.

The concentration of the functionalized graphene in the solvent to form a dispersion is more than 10 wt%; the surface of the functionalized graphene is distributed with active functional groups containing any multiple of sulfonic acid groups, xylene sulfonic acid groups or p-toluene sulfonic acid groups; the number ratio of active functional groups to carbon hexacyclic rings in the functionalized graphene is 1: 5; the average value of the sheet diameter of the functionalized graphene is 50-100 mu m, and the number of layers of the functionalized graphene is 1-2.

And 3, dispersing the carbon fiber precursor in a solvent, heating the formed mixture to 30-180 ℃, and continuously stirring to obtain the carbon fiber precursor solution.

The carbon fiber precursor is pitch and/or polyacrylonitrile resin.

The solvent includes any of xylene, N-dimethylformamide, N-dimethylacetamide, dimethylsulfoxide, and the like.

And 4, uniformly blending the graphene dispersion liquid obtained in the step 2 and the carbon fiber precursor solution obtained in the step 3 to form a graphene-modified carbon fiber precursor solution.

The mass ratio of the functionalized graphene to the carbon fiber precursor in the graphene-modified carbon fiber precursor solution is 5: 100.

the concentration of the carbon fiber precursor contained in the graphene-modified carbon fiber precursor solution is 25 wt%.

And 5, taking the graphene-modified carbon fiber precursor solution obtained in the step 4 as a spinning stock solution, and preparing the graphene-modified carbon fiber precursor through a spinning process.

And 6, carrying out pre-oxidation treatment on the precursor of the graphene-modified carbon fiber obtained in the step 5, and then carrying out carbonization treatment in a protective atmosphere to obtain the graphene-modified composite carbon fiber.

The pre-oxidation treatment is carried out in oxygen-containing atmosphere, the temperature of the pre-oxidation treatment is 200-280 ℃, and the time is 30-90 min.

The protective atmosphere is a nitrogen and/or helium atmosphere.

The temperature of the carbonization treatment is 800-1200 ℃, and the time is 30-90 min.

The embodiment also provides the cutting-resistant graphene modified carbon fiber filament prepared by the method.

The graphene modified composite carbon fiber obtained in each example is tested, and the graphene modified composite carbon fiber has the tensile strength of 4.9-9.4 GPa, the tensile modulus of 503-1180 GPa and the electrical conductivity of 7.5 multiplied by 10⁴～6.1×10⁶S·m^-1Thermal conductivity of 3.4 to 90 W.m^-1·K^-1. The prepared yarn reaches the American standard cutting resistance grade 9 through ANSI test.

The specific experimental process is as follows: firstly, the modified Hummers method is adopted to prepare graphene oxide with good dispersibility by taking natural graphite powder (30 mu m, Beijing national drug group) as a raw material. The domestic carbon fiber (12k, Jilin Shenzhou carbon fiber Co., Ltd.) is put into a three-neck flask, and is refluxed with acetone for 48 hours at the constant temperature of 70 ℃ for desizing, and the desized domestic carbon fiber is reacted with concentrated nitric acid at the constant temperature of 90 ℃ to obtain the acidified domestic carbon fiber. Then mixing the acidified domestic carbon fiber with PAMAM (G)_1.0Sigma-Aldrich, USA) is reacted for 12 hours at the temperature of 20-30 ℃, then repeatedly washed by methanol and deionized water, and dried in vacuum at the temperature of 50 ℃ to obtain the PAMAM modified domestic carbon fiber. And finally, adding graphene oxide into an acetone solution, carrying out ultrasonic treatment for 30min, adding the PAMAM modified domestic carbon fiber into the mixed solution (the mass ratio of GO to PAMAM modified fiber is 1: 3), reacting for 12h at 100 ℃, filtering, alternately washing the filtered domestic carbon fiber with acetone and deionized water for 5 times, and drying for 2h at 50 ℃ under a vacuum condition to obtain the graphene oxide grafted domestic carbon fiber novel reinforcement (GO-g-CF).

The experimental results are as follows: the surface roughness of the domestic carbon fiber is improved by 166%, the surface energy is improved by 46.3%, the tensile strength is improved by 7.8%, and the interface shear strength of the composite material is improved by 111.7% through the grafting modification of the graphene oxide.

The invention provides a cutting-resistant graphene modified carbon fiber filament and a preparation method thereof, which are characterized in that functionalized graphene, a carbon fiber precursor and a solvent are uniformly mixed to form a graphene modified carbon fiber precursor solution as a spinning solution; then preparing a graphene modified carbon fiber precursor by using the spinning solution through a spinning process; and then, carrying out preoxidation treatment on the precursor protofilament of the graphene-modified carbon fiber, and then carrying out carbonization treatment in a protective atmosphere to obtain the graphene-modified composite carbon fiber. The prepared fiber has excellent comprehensive performance, good cutting resistance effect, wide application prospect, simple preparation process, good controllability and suitability for large-scale production.

While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention. Various modifications and alterations to this invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be determined from the following claims.