Carbon fiber composite wrap yarn and preparation process thereof

Abstract

The invention discloses a carbon fiber composite wrap yarn and a preparation process thereof. The process comprises the following steps: step 1, removing impurities at high temperature; step 2, pre-treatment is carried out; step 3, pre-processing; step 4, dipping treatment; step 5, curing treatment; step 6, performing primary coating; step 7, carrying out secondary coating; step 8, dipping and spinning; according to the invention, the carbon fiber is subjected to high-temperature impurity removal and pre-preparation treatment, so that the influence of impurities on the coating effect is avoided, and the processing qualification rate of products is improved; the bonding granularity of the carbon fibers is improved by spraying and filling auxiliary materials on the silk threads, and then the bonding strength between the resin and the silk threads is guaranteed by taking a silane coupling agent as an interface modifier between the base resin and the carbon fibers; according to the wrap yarn, the polyester fibers and the nylon are wrapped on the silk yarn in a cabling and winding mode in sequence, a double-layer wrapping structure with different wrapping forms is formed, the wrap yarn is not prone to cracking due to stress in multiple directions after spinning, and therefore the physical performance of the wrap yarn is improved.

Description

Technical Field

[0001] The invention relates to the technical field of composite materials, in particular to a carbon fiber composite coated yarn and a preparation process thereof. Background Art

[0002] Carbon fiber composite coated yarn is an innovative material that combines carbon fiber and textile technology. It uses carbon fiber as the core or reinforcing element and is coated with other fibers. This material combines the high strength and low weight characteristics of carbon fiber with the good processability and softness of textile fiber, thus showing unique application advantages in multiple fields. The existing carbon fiber composite coated yarn and its preparation process can basically meet the use needs of daily processing, but there are still certain shortcomings. First, the coating structure process of the existing composite coated yarn is simple and is limited by a single coating layer. After imitation, stress in different directions can easily cause the coating layer to crack, thereby affecting the physical properties of the coated yarn. Second, there is a lack of carbon fiber processing before preparation, and the impurities remaining on the carbon fiber raw material will affect the subsequent coating effect, thereby reducing the production qualification rate of the product. Third, in order to ensure the strength of the silk thread before spinning, the silk thread needs to be impregnated with a matrix resin, but the two structures are relatively independent, which affects the bonding strength between the resin and the silk thread. Therefore, it is necessary to design a carbon fiber composite coated yarn and its preparation process. Summary of the invention

[0003] The object of the present invention is to provide a carbon fiber composite coated yarn and a preparation process thereof, so as to solve the problems raised in the above background technology.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical scheme: a carbon fiber composite coated yarn, the formula of which includes: carbon fiber, polyester fiber, nylon, matrix resin, silane coupling agent and filling auxiliary materials; the percentage content of each component is: 35% to 55% of carbon fiber, 12% to 18% of polyester fiber, 12% to 18% of nylon, 0.2% to 0.5% of silane coupling agent, 10% to 30% of matrix resin, and the rest is filling auxiliary materials.

[0005] A preparation process of a carbon fiber composite coated yarn comprises the following steps: step 1, high temperature impurity removal; step 2, pre-processing; step 3, pre-processing; step 4, impregnation treatment; step 5, curing treatment; step 6, preliminary coating; step 7, secondary coating; step 8, impregnation spinning;

[0006] In the above step 1, a carbon fiber raw material of corresponding specification tow, strength and modulus grade is selected according to the needs, and then the carbon fiber raw material is placed in a vacuum furnace for high-temperature impurity removal, and the carbon fiber base material obtained after high-temperature impurity removal is set aside;

[0007] In the above step 2, the carbon fiber base material prepared in the above step 1 is immersed in acetone, rinsed with clean water after the immersion treatment, placed in an ultrasonic cleaning machine for ultrasonic cleaning after the clean water cleaning, placed in a drying oven for vacuum drying after the ultrasonic cleaning, and pure carbon fiber is obtained after vacuum drying for standby use;

[0008] In the above step 3, a plasma treatment machine is used to perform surface activation treatment on the pure carbon fiber prepared in the above step 2, and the pretreated carbon fiber is obtained after the activation treatment for standby use;

[0009] In the above step 4, the surface of the pretreated carbon fiber prepared in the above step 3 is sprayed with a filling auxiliary material, and the silane coupling agent is dissolved in ethanol at the same time, and then the sprayed filling auxiliary material after the spraying of the filling auxiliary material is placed in the ethanol in which the silane coupling agent is dissolved for immersion treatment, and the impregnated fiber is obtained after the immersion treatment, and is used for standby;

[0010] In the above step 5, the impregnated fiber prepared in the above step 4 is placed in a heating oven for curing treatment, and after the curing treatment, a cured fiber filament is obtained for standby use;

[0011] In the above step 6, the polyester fiber is initially coated on the surface of the solidified fiber yarn using a twisting machine to form a preliminary composite yarn for standby use;

[0012] In the above step 7, nylon is wound on the surface of the preliminary composite wire prepared in the above step 6 using an automatic winding machine to form a double-layer composite wire for standby use;

[0013] In the above step eight, the double-layer composite wire prepared in the above step seven is immersed in a thermosetting or thermoplastic resin using a dipping tank, and then heated and cured in an oven. After curing, a multi-axial braiding machine is used for spinning processing to obtain a carbon fiber composite coated yarn.

[0014] As a further technical solution of the present invention, in the step one, the temperature in the vacuum furnace during the high-temperature impurity removal process is 560-730°C, and the time of the high-temperature impurity removal is 100-120 minutes. During the high-temperature impurity removal process, argon gas is continuously introduced into the vacuum furnace; after the high-temperature impurity removal, it is cooled to room temperature and then taken out.

[0015] As a further technical solution of the present invention, in the step 2, the immersion treatment time is 10 to 15 minutes, and after the immersion treatment, it is rinsed with clean water for 3 to 4 minutes. When ultrasonic cleaning is performed in an ultrasonic cleaning machine, the operating frequency of the ultrasonic cleaning machine is 5 to 13 kHz, and the ultrasonic cleaning time is 7 to 15 minutes. During the vacuum drying process, the temperature in the drying oven is 65 to 70°C, and the vacuum drying time is 40 to 60 minutes.

[0016] As a further technical solution of the present invention, in step three, the processing frequency of the plasma processor during the activation process is 50-200W.

[0017] As a further technical solution of the present invention, in step 4, the spraying thickness of the filling auxiliary material is 0.12 to 0.2 microns, the temperature of the ethanol during the immersion treatment is 20 to 30° C., and the immersion treatment time is 120 to 180 minutes.

[0018] As a further technical solution of the present invention, in step five, the temperature in the heating oven during the curing process is 65-70° C., and the curing time is 40-60 minutes.

[0019] As a further technical solution of the present invention, in the step six, during the process of the polyester fiber being initially coated on the surface of the solidified fiber filament, the twist of the twisting machine is 120 to 180 twists / m.

[0020] As a further technical solution of the present invention, in the step seven, during the process of winding nylon on the surface of the preliminary composite yarn, the winding angle of the automatic winding machine is 30° to 70°.

[0021] As a further technical solution of the present invention, in step eight, the temperature in the oven during the heating and curing process is 65-70° C., and the treatment time of the heating and curing is 60-80 minutes.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows: the carbon fiber composite coated yarn and its preparation process, before the carbon fiber raw material is put into production, the raw material is subjected to high-temperature impurity removal under the protection of inert gas, and then the raw material is placed in an alcohol solution for immersion after cooling to remove residual organic matter, and finally ultrasonic cleaning is performed to avoid the residual impurities on the raw material affecting the subsequent coating effect, thereby improving the processing qualification rate of the product; the filling auxiliary material is sprayed on the silk thread before the coating treatment to increase the bonding particle size of the carbon fiber, and then the ethanol solution in which the silane coupling agent is dissolved is used for impregnation, so that the silane coupling agent is used as an interface modifier between the base resin and the carbon fiber, the chemical bonding effect is strengthened, and the bonding strength between the resin and the silk thread is guaranteed; the polyester fiber and nylon are coated on the silk thread in succession by twisting and winding, forming a double-layer coating structure with different coating forms, which is not easy to crack under multi-directional stress after spinning, thereby improving the physical properties of the coated yarn. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a flow chart of the preparation process of the present invention. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] The present invention provides a technical solution: a carbon fiber composite coated yarn, the formula of which includes: carbon fiber, polyester fiber, nylon, matrix resin, silane coupling agent and filling auxiliary materials; the percentage content of each component is: 35% to 55% of carbon fiber, 12% to 18% of polyester fiber, 12% to 18% of nylon, 0.2% to 0.5% of silane coupling agent, 10% to 30% of matrix resin, and the rest is filling auxiliary materials.

[0026] Please see attached Figure 1 , an embodiment provided by the present invention:

[0027] Embodiment 1:

[0028] A preparation process of a carbon fiber composite coated yarn comprises the following steps: step 1, high temperature impurity removal; step 2, pre-processing; step 3, pre-processing; step 4, impregnation treatment; step 5, curing treatment; step 6, preliminary coating; step 7, secondary coating; step 8, impregnation spinning;

[0029] In the above step 1, a carbon fiber raw material of corresponding specification tow, strength and modulus grade is selected according to the needs, and then the carbon fiber raw material is placed in a vacuum furnace for high-temperature impurity removal, and the carbon fiber base material obtained after high-temperature impurity removal is reserved; the temperature in the vacuum furnace during the high-temperature impurity removal process is 730°C, and the high-temperature impurity removal time is 120 minutes, and argon gas is continuously introduced into the vacuum furnace during the high-temperature impurity removal process; after the high-temperature impurity removal, it is cooled to room temperature and then taken out;

[0030] In the above step 2, the carbon fiber base material prepared in the above step 1 is immersed in acetone, rinsed with clean water after immersion treatment, placed in an ultrasonic cleaning machine for ultrasonic cleaning after clean water cleaning, placed in a drying oven for vacuum drying after ultrasonic cleaning, and pure carbon fiber is obtained after vacuum drying for standby use; the immersion treatment time is 15 minutes, and the immersion treatment is rinsed with clean water for 4 minutes. When ultrasonic cleaning is performed in the ultrasonic cleaning machine, the operating frequency of the ultrasonic cleaning machine is 13kHz, the ultrasonic cleaning time is 15 minutes, the temperature in the drying oven during the vacuum drying process is 70°C, and the vacuum drying time is 60 minutes;

[0031] In the above step 3, a plasma treatment machine is used to perform surface activation treatment on the pure carbon fiber prepared in the above step 2, and the pretreated carbon fiber is obtained after the activation treatment for standby use; in the step 3, the processing frequency of the plasma treatment machine during the activation treatment is 200W;

[0032] In the above step 4, the surface of the pretreated carbon fiber prepared in the above step 3 is sprayed with a filling auxiliary material, and the silane coupling agent is dissolved in ethanol at the same time, and then the sprayed filling auxiliary material is placed in the ethanol in which the silane coupling agent is dissolved for immersion treatment, and the impregnated fiber is obtained after the immersion treatment, and is used for standby; the spraying thickness of the filling auxiliary material is 0.2 microns, the temperature of the ethanol during the immersion treatment is 30°C, and the immersion treatment time is 180 minutes;

[0033] In the above step 5, the impregnated fiber prepared in the above step 4 is placed in a heating oven for curing treatment, and after the curing treatment, the cured fiber filaments are obtained for standby use; the temperature in the heating oven during the curing treatment is 70° C., and the curing treatment time is 60 minutes;

[0034] In the above step 6, the polyester fiber is initially coated on the surface of the solidified fiber yarn using a twisting machine to form a preliminary composite yarn for standby use; the twist of the twisting machine during the process of initially coating the polyester fiber on the surface of the solidified fiber yarn is 180 twists / m;

[0035] In the above step 7, nylon is wound on the surface of the preliminary composite wire prepared in the above step 6 using an automatic winding machine to form a double-layer composite wire for standby use; during the process of winding nylon on the surface of the preliminary composite wire, the winding angle of the automatic winding machine is 70°;

[0036] In the above step eight, the double-layer composite wire prepared in the above step seven is immersed in a thermosetting or thermoplastic resin using a dipping tank, and then heated and cured in an oven. After curing, it is spun using a multi-axial braiding machine to obtain a carbon fiber composite coated yarn. The temperature in the oven during the heating and curing process is 70°C, and the heating and curing treatment time is 80 minutes.

[0037] Embodiment 2:

[0038] A preparation process of a carbon fiber composite coated yarn comprises the following steps: step 1, high temperature impurity removal; step 2, pre-processing; step 3, pre-processing; step 4, impregnation treatment; step 5, curing treatment; step 6, preliminary coating; step 7, secondary coating; step 8, impregnation spinning;

[0039] In the above step 1, carbon fiber raw materials with corresponding specifications of tow, strength, and modulus grades are selected as needed. Then, the carbon fiber raw materials are put into a vacuum furnace for high-temperature impurity removal. The carbon fiber base material obtained after high-temperature impurity removal is reserved. During the high-temperature impurity removal process, the temperature in the vacuum furnace is 560 °C, and the time for high-temperature impurity removal is 100 min. Argon gas is continuously introduced into the vacuum furnace during the high-temperature impurity removal process. After cooling to room temperature, it is taken out after high-temperature impurity removal.

[0040] In the above step 2, the carbon fiber base material prepared in step 1 is put into acetone for soaking. After the soaking treatment, it is rinsed with clean water. After being rinsed with clean water, it is put into an ultrasonic cleaner for ultrasonic cleaning. After ultrasonic cleaning, it is put into a drying oven for vacuum drying. The pure carbon fiber obtained after vacuum drying is reserved. The time for the soaking treatment is 10 min. After the soaking treatment, it is rinsed with clean water for 3 min. When performing ultrasonic cleaning in the ultrasonic cleaner, the working frequency of the ultrasonic cleaner is 5 kHz, and the time for ultrasonic cleaning is 7 min. During the vacuum drying process, the temperature in the drying oven is 65 °C, and the time for vacuum drying is 40 min.

[0041] In the above step 3, a plasma processor is used to perform surface activation treatment on the pure carbon fiber prepared in step 2. The pretreated carbon fiber obtained after the activation treatment is reserved. In step 3, the processing frequency of the plasma processor during the activation treatment is 50 W.

[0042] In the above step 4, a filling auxiliary is sprayed on the surface of the pretreated carbon fiber prepared in step 3. At the same time, a silane coupling agent is dissolved in ethanol. Then, the sprayed filling auxiliary is placed in the ethanol in which the silane coupling agent is dissolved for impregnation treatment. The impregnated fiber obtained after the impregnation treatment is reserved. The spraying thickness of the filling auxiliary is 0.12 microns. During the impregnation treatment, the temperature of the ethanol is 20 °C, and the time for the impregnation treatment is 120 min.

[0043] In the above step 5, the impregnated fiber prepared in step 4 is put into a heating oven for curing treatment. The cured fiber filament obtained after the curing treatment is reserved. During the curing treatment, the temperature in the heating oven is 65 °C, and the time for the curing treatment is 40 min.

[0044] In the above step 6, a polyester fiber is preliminarily coated on the surface of the cured fiber filament using a doubling and twisting machine to form a preliminarily composite filament, which is reserved. During the process of preliminarily coating the polyester fiber on the surface of the cured fiber filament, the twist of the doubling and twisting machine is 120 turns / m.

[0045] In the above step 7, an automatic winding machine is used to wind nylon on the surface of the preliminary composite wire prepared in the above step 6 to form a double-layer composite wire for standby use; during the process of winding nylon on the surface of the preliminary composite wire, the winding angle of the automatic winding machine is 30°;

[0046] In the above step eight, the double-layer composite wire prepared in the above step seven is immersed in a thermosetting or thermoplastic resin using a dipping tank, and then heated and cured in an oven. After curing, it is spun using a multi-axial braiding machine to obtain a carbon fiber composite coated yarn. The temperature in the oven during the heating and curing process is 65°C, and the heating and curing treatment time is 60 minutes.

[0047] Embodiment 3:

[0048] A preparation process of a carbon fiber composite coated yarn comprises the following steps: step 1, high temperature impurity removal; step 2, pre-processing; step 3, pre-processing; step 4, impregnation treatment; step 5, curing treatment; step 6, preliminary coating; step 7, secondary coating; step 8, impregnation spinning;

[0049] In the above step 1, a carbon fiber raw material of corresponding specification tow, strength and modulus grade is selected according to the needs, and then the carbon fiber raw material is placed in a vacuum furnace for high-temperature impurity removal. The carbon fiber base material obtained after high-temperature impurity removal is reserved; the temperature in the vacuum furnace during the high-temperature impurity removal process is 730°C, and the high-temperature impurity removal time is 100 minutes. During the high-temperature impurity removal process, argon gas is continuously introduced into the vacuum furnace; after the high-temperature impurity removal, it is cooled to room temperature and then taken out;

[0050] In the above step 2, the carbon fiber base material prepared in the above step 1 is immersed in acetone, rinsed with clean water after immersion treatment, placed in an ultrasonic cleaning machine for ultrasonic cleaning after clean water cleaning, placed in a drying oven for vacuum drying after ultrasonic cleaning, and pure carbon fiber is obtained after vacuum drying for standby use; the immersion treatment time is 15 minutes, and the immersion treatment is rinsed with clean water for 3 minutes. When ultrasonic cleaning is performed in the ultrasonic cleaning machine, the operating frequency of the ultrasonic cleaning machine is 13kHz, the ultrasonic cleaning time is 7 minutes, the temperature in the drying oven during the vacuum drying process is 70°C, and the vacuum drying time is 40 minutes;

[0051] In the above step 3, a plasma treatment machine is used to perform surface activation treatment on the pure carbon fiber prepared in the above step 2, and the pretreated carbon fiber is obtained after the activation treatment for standby use; in the step 3, the processing frequency of the plasma treatment machine during the activation treatment is 200W;

[0052] In the above step 4, the surface of the pretreated carbon fiber prepared in the above step 3 is sprayed with a filling auxiliary material, and the silane coupling agent is dissolved in ethanol at the same time, and then the sprayed filling auxiliary material is placed in the ethanol in which the silane coupling agent is dissolved for immersion treatment, and the impregnated fiber is obtained after the immersion treatment, and is used for standby; the spraying thickness of the filling auxiliary material is 0.12 microns, the temperature of the ethanol during the immersion treatment is 30°C, and the immersion treatment time is 120 minutes;

[0053] In the above step 5, the impregnated fiber prepared in the above step 4 is placed in a heating oven for curing treatment, and after the curing treatment, the cured fiber filaments are obtained for standby use; the temperature in the heating oven during the curing treatment is 70° C., and the curing treatment time is 40 minutes;

[0054] In the above step 6, the polyester fiber is initially coated on the surface of the solidified fiber yarn using a twisting machine to form a preliminary composite yarn for standby use; the twist of the twisting machine during the process of initially coating the polyester fiber on the surface of the solidified fiber yarn is 180 twists / m;

[0055] In the above step 7, an automatic winding machine is used to wind nylon on the surface of the preliminary composite wire prepared in the above step 6 to form a double-layer composite wire for standby use; during the process of winding nylon on the surface of the preliminary composite wire, the winding angle of the automatic winding machine is 30°;

[0056] In the above step eight, the double-layer composite wire prepared in the above step seven is immersed in a thermosetting or thermoplastic resin using a dipping tank, and then heated and cured in an oven. After curing, it is spun using a multi-axial braiding machine to obtain a carbon fiber composite coated yarn. The temperature in the oven during the heating and curing process is 70°C, and the heating and curing treatment time is 60 minutes.

[0057] The carbon fiber composite covered yarn obtained in the above example was tested for performance and compared with the common composite covered yarn on the market. The results are shown in the following table:

[0058] Doping rate Interface shear strength Example 1 0.14％ 75MPa Example 2 0.08％ 73MPa Example 3 0.23％ 78MPa Comparative Example 2.35％ 45MPa

[0059] Based on the above, the advantages of the present invention are that, before the carbon fiber raw material is put into production, the raw material is subjected to high-temperature impurity removal under the protection of an inert gas, and then, after cooling, it is placed in an alcohol solution for immersion to remove residual organic matter, and finally, ultrasonic cleaning is performed to avoid the residual impurities on the raw material affecting the subsequent coating effect, thereby improving the processing qualification rate of the product; the filling auxiliary material is sprayed on the silk thread before the coating treatment to increase the bonding particle size of the carbon fiber, and then an ethanol solution of a dissolved silane coupling agent is used for impregnation, so that the silane coupling agent is used as an interface modifier between the base resin and the carbon fiber, thereby strengthening the chemical bonding effect and ensuring the bonding strength between the resin and the silk thread; the polyester fiber and nylon are coated on the silk thread in succession by twisting and winding, thereby forming a double-layer coating structure with different coating forms, which is not easy to crack under multi-directional stress after spinning, thereby improving the physical properties of the coated yarn.

[0060] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A carbon fiber composite coated yarn, the formula comprising: Carbon fiber, polyester fiber, nylon, matrix resin, silane coupling agent and filling auxiliary materials; the characteristics are that the percentage content of each component is: 35% to 55% carbon fiber, 12% to 18% polyester fiber, 12% to 18% nylon, 0.2% to 0.5% silane coupling agent, 10% to 30% matrix resin, and the rest is filling auxiliary materials.

2. A process for preparing a carbon fiber composite coated yarn, comprising the following steps: Step 1, high temperature impurity removal; Step 2, pre-treatment; Step 3, pre-processing; Step 4, impregnation treatment; Step 5, curing treatment; Step 6, preliminary coating; Step 7, secondary coating; Step 8, impregnation spinning; It is characterized by: In the above step 1, a carbon fiber raw material of corresponding specification tow, strength and modulus grade is selected according to the needs, and then the carbon fiber raw material is placed in a vacuum furnace for high-temperature impurity removal, and the carbon fiber base material obtained after high-temperature impurity removal is set aside; In the above step 2, the carbon fiber base material prepared in the above step 1 is immersed in acetone, rinsed with clean water after the immersion treatment, placed in an ultrasonic cleaning machine for ultrasonic cleaning after the clean water cleaning, placed in a drying oven for vacuum drying after the ultrasonic cleaning, and pure carbon fiber is obtained after vacuum drying for standby use; In the above step 3, a plasma treatment machine is used to perform surface activation treatment on the pure carbon fiber prepared in the above step 2, and the pretreated carbon fiber is obtained after the activation treatment for standby use; In the above step 4, the surface of the pretreated carbon fiber prepared in the above step 3 is sprayed with a filling auxiliary material, and the silane coupling agent is dissolved in ethanol at the same time, and then the sprayed filling auxiliary material after the spraying of the filling auxiliary material is placed in the ethanol in which the silane coupling agent is dissolved for immersion treatment, and the impregnated fiber is obtained after the immersion treatment, and is used for standby; In the above step 5, the impregnated fiber prepared in the above step 4 is placed in a heating oven for curing treatment, and after the curing treatment, a cured fiber filament is obtained for standby use; In the above step 6, the polyester fiber is initially coated on the surface of the solidified fiber yarn using a twisting machine to form a preliminary composite yarn for standby use; In the above step 7, nylon is wound on the surface of the preliminary composite wire prepared in the above step 6 using an automatic winding machine to form a double-layer composite wire for standby use; In the above step eight, the double-layer composite wire prepared in the above step seven is immersed in a thermosetting or thermoplastic resin using a dipping tank, and then heated and cured in an oven. After curing, a multi-axial braiding machine is used for spinning processing to obtain a carbon fiber composite coated yarn.

3. The process for preparing a carbon fiber composite coated yarn according to claim 2, characterized in that: In the step 1, the temperature in the vacuum furnace during the high-temperature impurity removal process is 560-730° C., and the time for the high-temperature impurity removal is 100-120 min. Argon gas is continuously introduced into the vacuum furnace during the high-temperature impurity removal process; after the high-temperature impurity removal, the mixture is cooled to room temperature and then taken out.

4. The process for preparing a carbon fiber composite coated yarn according to claim 2, characterized in that: In the step 2, the soaking treatment time is 10 to 15 minutes, and after the soaking treatment, it is rinsed with clean water for 3 to 4 minutes. When ultrasonic cleaning is performed in an ultrasonic cleaning machine, the operating frequency of the ultrasonic cleaning machine is 5 to 13 kHz, and the ultrasonic cleaning time is 7 to 15 minutes. During the vacuum drying process, the temperature in the drying oven is 65 to 70° C., and the vacuum drying time is 40 to 60 minutes.

5. The process for preparing a carbon fiber composite coated yarn according to claim 2, characterized in that: In the step three, the processing frequency of the plasma processor during the activation process is 50-200W.

6. The process for preparing a carbon fiber composite coated yarn according to claim 2, characterized in that: In the step 4, the spraying thickness of the filling auxiliary material is 0.12 to 0.2 microns, the temperature of the ethanol during the immersion treatment is 20 to 30° C., and the immersion treatment time is 120 to 180 minutes.

7. The process for preparing a carbon fiber composite coated yarn according to claim 2, characterized in that: In the step 5, the temperature in the heating oven during the curing process is 65-70° C., and the curing time is 40-60 minutes.

8. The process for preparing a carbon fiber composite coated yarn according to claim 2, characterized in that: In the step six, during the process of initially covering the polyester fiber on the surface of the solidified fiber filament, the twist of the twisting machine is 120 to 180 twists / m.

9. The process for preparing a carbon fiber composite coated yarn according to claim 2, characterized in that: In the step seven, during the process of winding nylon on the surface of the preliminary composite yarn, the winding angle of the automatic winding machine is 30° to 70°.

10. The process for preparing a carbon fiber composite coated yarn according to claim 2, characterized in that: In the step eight, the temperature in the oven during the heating and curing process is 65-70° C., and the treatment time of the heating and curing is 60-80 minutes.

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