阅读说明：本技术 一种碳纤维的表面处理方法 (Surface treatment method of carbon fiber ) 是由 陈永贵 于 2019-08-28 设计创作，主要内容包括：本发明属于碳纤维加工技术领域,尤其是一种碳纤维的表面处理方法,针对现有的碳纤维是一种高性能特种纤维,其碳含量在90％以上,表面含氧含氮基团极少,碳纤维与基体树脂的界面粘结性较差的问题,现提出如下方案,其包括以下步骤：S1：将选定的碳纤维进行低温等离子轰击处理；S2：采用显微镜观察S1中处理过后的碳纤维的表面粗糙度；S3：将S1中处理过后的碳纤维加入到含酮溶液中进行浸泡处理；S4：使用去离子水对浸泡过后的碳纤维进行反复清洗。本发明可以在碳纤维的表面明显增加含氧基团,增加碳纤维表面的粗糙程度,明显提升碳纤维与基体树脂的界面粘结性,且处理方法的成本低,值得广泛推广使用。(The invention belongs to the technical field of carbon fiber processing, in particular to a surface treatment method of carbon fiber, aiming at the problems that the existing carbon fiber is a high-performance special fiber, the carbon content is more than 90 percent, the surface contains few oxygen and nitrogen groups, and the interface cohesiveness of the carbon fiber and matrix resin is poor, the following scheme is proposed, which comprises the following steps: s1: carrying out low-temperature plasma bombardment treatment on the selected carbon fibers; s2: observing the surface roughness of the carbon fiber treated in the step S1 by using a microscope; s3: adding the carbon fiber treated in the S1 into a ketone-containing solution for soaking treatment; s4: and repeatedly cleaning the soaked carbon fibers by using deionized water. The method can obviously increase oxygen-containing groups on the surface of the carbon fiber, increase the roughness of the surface of the carbon fiber, obviously improve the interface cohesiveness of the carbon fiber and matrix resin, has low cost, and is worthy of wide popularization and application.)

1. A surface treatment method of carbon fiber comprises the following steps:

s1: carrying out low-temperature plasma bombardment treatment on the selected carbon fibers;

s2: observing the surface roughness of the carbon fiber treated in the step S1 by using a microscope;

s3: adding the carbon fiber treated in the S1 into a ketone-containing solution for soaking treatment;

s4: repeatedly cleaning the soaked carbon fibers by using deionized water;

s5: carrying out surface modification treatment on the cleaned carbon fiber;

s6: washing the modified carbon fiber with deionized water to form a liquid film on the surface of the carbon fiber;

s7: adding the carbon fiber treated in the S6 into an electrolytic bath;

s8: continuously dipping the carbon fiber electrolyzed in the S7 in a chemical solution;

s9: and drying, sizing and rolling the impregnated carbon fibers, and finally finishing the surface treatment work of the carbon fibers.

2. The method for surface treatment of carbon fiber according to claim 1, wherein in S1, the low temperature plasma bombardment treatment is one or more of glow discharge, corona discharge, and dielectric barrier discharge atmospheric pressure plasma torch.

3. The method for surface treatment of carbon fiber according to claim 1, wherein in S2, the microscope is a scanning tunneling microscope.

4. The method of claim 1, wherein in the step S3, the ketone-containing solution is dimethyl ketone after the treatment, the soaking time is 60S to 180S, and the temperature of dimethyl ketone is 30 ℃ to 50 ℃.

5. The method as claimed in claim 1, wherein in S4, the carbon fiber surface is repeatedly washed with deionized water for 3-5 times, the amount of deionized water used for washing the carbon fiber surface is 200 ml and 300ml each time, and the washing speed is constant.

6. The method for surface treatment of carbon fiber according to claim 1, wherein in S5, the method for surface modification of carbon fiber is air oxidation among vapor phase oxidation methods.

7. The method of claim 1, wherein in step S6, the modified carbon fiber surface forms a slurry, the slurry is washed with deionized water 4-5 times to clean the carbon fiber surface, and a liquid film is formed on the carbon fiber surface.

8. The method for surface treatment of carbon fiber according to claim 1, wherein in S7, an anode collector bar and a cathode collector bar are provided in an electrolytic bath, respectively, and the carbon fiber is subjected to anodic oxidation treatment by connecting the anode collector bar and the cathode collector bar.

9. The method for surface treatment of carbon fiber as claimed in claim 1, wherein in S8, the chemical solution is ammonia water, wherein the mass fraction of ammonia water is 10-20%, the carbon fiber is immersed in the ammonia water intermittently for three times, and the duration of each immersion is 30-50S.

10. The method for surface treatment of carbon fiber as claimed in claim 1, wherein in S9, the surface of the carbon fiber is dried by a hot air blower for 50-80S, the surface of the carbon fiber is coated with the slurry, and the winding is performed by a winding machine.

Technical Field

The invention relates to the technical field of carbon fiber processing, in particular to a surface treatment method of carbon fibers.

Background

Carbon fibers have excellent mechanical properties (particularly tensile properties), so that the carbon fibers are often used as a reinforcing phase of a composite material, and particularly carbon fiber reinforced resin matrix composite materials are more and more widely valued and applied. The mechanical properties of the composite material depend on the transmission of interfacial stress in addition to the mechanical properties of the reinforcing phase and the matrix. The surface of the carbon fiber is chemically inert, has low surface energy and is lyophobic, so that the carbon fiber is not well bonded with the matrix, and therefore the carbon fiber is subjected to surface treatment before use. At present, the surface treatment of carbon fibers is mainly to enhance the surface chemical activity of the carbon fibers and enhance the interfacial bonding strength between the carbon fibers and a matrix so as to enhance the service performance of the composite material.

The existing carbon fiber is a high-performance special fiber, the carbon content of the existing carbon fiber is more than 90 percent, the surface contains few oxygen and nitrogen groups, and the interface cohesiveness of the carbon fiber and matrix resin is poor, so a surface treatment method of the carbon fiber is provided for solving the problems.

Disclosure of Invention

The invention aims to solve the defects that carbon fiber is high-performance special fiber in the prior art, the carbon content of the carbon fiber is more than 90 percent, the surface contains few oxygen and nitrogen groups, and the interface bonding property between the carbon fiber and matrix resin is poor.

In order to achieve the purpose, the invention adopts the following technical scheme:

a surface treatment method of carbon fiber comprises the following steps:

s1: carrying out low-temperature plasma bombardment treatment on the selected carbon fibers;

s2: observing the surface roughness of the carbon fiber treated in the step S1 by using a microscope;

s3: adding the carbon fiber treated in the S1 into a ketone-containing solution for soaking treatment;

s4: repeatedly cleaning the soaked carbon fibers by using deionized water;

s5: carrying out surface modification treatment on the cleaned carbon fiber;

s6: washing the modified carbon fiber with deionized water to form a liquid film on the surface of the carbon fiber;

s7: adding the carbon fiber treated in the S6 into an electrolytic bath;

s8: continuously dipping the carbon fiber electrolyzed in the S7 in a chemical solution;

s9: and drying, sizing and rolling the impregnated carbon fibers, and finally finishing the surface treatment work of the carbon fibers.

Preferably, in S1, the low-temperature plasma bombardment treatment is one or more of glow discharge, corona discharge, and dielectric barrier discharge atmospheric pressure plasma torch.

Preferably, in S2, the microscope is a scanning tunneling microscope, and the plasma-treated surface of the carbon fiber can be observed, so that the plasma-treated surface of the carbon fiber can be visually observed to be rougher.

Preferably, in S3, the ketone-containing solution is treated dimethyl ketone, the soaking time is 60S to 180S, and the temperature of dimethyl ketone is 30 ℃ to 50 ℃.

Preferably, in S4, the deionized water is used to repeatedly rinse the surface of the carbon fiber for 3-5 times, the amount of deionized water used to rinse the surface of the carbon fiber is 200-300ml each time, and the rinsing speed is constant.

Preferably, in S5, the method for modifying the surface of the carbon fiber is an air oxidation method among gas phase oxidation methods, and the method is selected to reduce the cost.

Preferably, in S6, slurry is formed on the surface of the modified carbon fiber, the slurry is washed with deionized water 4-5 times, the surface of the carbon fiber is cleaned, and a liquid film is formed on the surface of the carbon fiber.

Preferably, in S7, the electrolytic cell is provided with an anode conductive rod and a cathode conductive rod, respectively, and the anode conductive rod and the cathode conductive rod are connected to anodize the carbon fibers.

Preferably, in S8, the chemical solution is ammonia water, wherein the mass fraction of the ammonia water is 10-20%, the carbon fibers are immersed in the ammonia water intermittently for three times, and the duration of each immersion is 30-50S.

Preferably, in the step S9, the hot air blower is used to dry the surface of the carbon fiber, the blowing time is 50 to 80S, the surface of the carbon fiber is covered with the sizing agent, the winding is performed by using a winding machine, the automation degree is high, and the manual strength is low.

In the invention, the surface of the carbon fiber is bombarded by glow discharge low-temperature plasma, the surface of the carbon fiber after plasma treatment is observed by using a selected scanning tunneling microscope, the surface of the carbon fiber after plasma treatment can be intuitively observed to be rougher, the carbon fiber after low-temperature plasma treatment is placed into a dimethyl ketone solution with the solution temperature of 30-50 ℃, the carbon fiber is soaked for 60-180S, deionized water is used for washing the surface of the carbon fiber for 3-5 times at a constant speed, so that the surface of the carbon fiber is in a clean state, after cleaning, the surface of the carbon fiber is modified by using an air oxidation method, oxygen-containing groups can be added on the surface of the carbon fiber while modification is carried out, the tensile strength of the surface of the carbon fiber is improved, the surface of the carbon fiber after modification can form slurry, and the surface of the carbon fiber is washed for 4-5 times by using the deionized water at normal temperature, forming a liquid film on the surface of the carbon fiber, placing the carbon fiber into an electrolytic tank provided with an anode conductive rod and a cathode conductive rod for anodic oxidation treatment, adding the carbon fiber into ammonia water with the mass fraction of 10-20% for soaking after the treatment, and finally drying, sizing and rolling the soaked carbon fiber to finish the treatment of the surface of the carbon fiber.

The method for modifying the surface of the carbon fiber is an air oxidation method, so that oxygen-containing groups can be obviously added on the surface of the carbon fiber, the roughness of the surface of the carbon fiber is increased, the interfacial adhesion of the carbon fiber and matrix resin is obviously improved, the cost of the treatment method is low, and the method is worthy of wide popularization.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

A surface treatment method of carbon fiber comprises the following steps:

s1: carrying out low-temperature plasma bombardment treatment on the selected carbon fibers;

s2: observing the surface roughness of the carbon fiber treated in the step S1 by using a microscope;

s3: adding the carbon fiber treated in the S1 into a ketone-containing solution for soaking treatment;

s4: repeatedly cleaning the soaked carbon fibers by using deionized water;

s5: carrying out surface modification treatment on the cleaned carbon fiber;

s6: washing the modified carbon fiber with deionized water to form a liquid film on the surface of the carbon fiber;

s7: adding the carbon fiber treated in the S6 into an electrolytic bath;

s8: continuously dipping the carbon fiber electrolyzed in the S7 in a chemical solution;

s9: and drying, sizing and rolling the impregnated carbon fibers, and finally finishing the surface treatment work of the carbon fibers.

In this embodiment, in S1, the low-temperature plasma bombardment treatment is performed by one or more of glow discharge, corona discharge, and dielectric barrier discharge at normal pressure, in S2, the microscope is a scanning tunneling microscope, the surface of the carbon fiber after plasma treatment can be observed, and it can be visually observed that the surface of the carbon fiber after plasma treatment is rougher, in S3, the ketone-containing solution is treated dimethyl ketone, the soaking time is 60S-180S, the temperature of dimethyl ketone is 30 ℃ to 50 ℃, in S4, the surface of the carbon fiber is repeatedly washed with deionized water for 3-5 times, the deionized water used for washing the surface of the carbon fiber each time is 200 ml and 300ml, the washing speed is constant, in S5, the method for modifying the surface of the carbon fiber is an air oxidation method in a gas phase oxidation method, the purpose of the selection is to reduce the cost, in S6, slurry is formed on the surface of the modified carbon fiber, deionized water is used for washing the slurry for 4-5 times, the surface of the carbon fiber is cleaned, a liquid film is formed on the surface of the carbon fiber, in S7, an anode conducting rod and a cathode conducting rod are respectively arranged in an electrolytic tank, the anode conducting rod and the cathode conducting rod are connected, the carbon fiber is subjected to anodic oxidation treatment, in S8, ammonia water is used as a chemical solution, the mass fraction of the ammonia water is 10-20%, the carbon fiber is immersed in the ammonia water in an intermittent mode, the immersion time is 30-50S for three times, in S9, a hot air blower is used for drying the surface of the carbon fiber, the blowing time is 50-80S, the surface of the carbon fiber is covered with slurry, a winding machine is used for winding, the automation degree is high, artificial strength.

In the embodiment, the surface of the carbon fiber is modified by using an air oxidation method, and meanwhile, the surface of the carbon fiber is added with the oxygen-containing group, so that the tensile strength of the surface of the carbon fiber can be obviously improved.

In this embodiment, the rolling machine is the receipts material part of coil stock processing lines, and it is the coil stock to wind raw and other materials into through mechanical system, and extensive application is in the scroll, the yardage roll, and the plastic material is rolled up, and on the metal coil processing lines, according to actual technological requirement design diversification, the common simple and easy rolling machine that has, hydraulic pressure rolling machine, the rolling machine generally have a book internal diameter to the material, rolls up the external diameter, and coil stock thickness, width all have strict requirements.

In the embodiment, the surface of the carbon fiber is bombarded by low-temperature plasma of glow discharge, the surface of the carbon fiber after plasma treatment is observed by using a selected scanning tunneling microscope, the surface of the carbon fiber after plasma treatment can be intuitively observed to be rougher, the carbon fiber after low-temperature plasma treatment is placed into a dimethyl ketone solution with the solution temperature of 30-50 ℃, the carbon fiber is soaked for 60-180S, deionized water is used for washing the surface of the carbon fiber for 3-5 times at a constant speed, so that the surface of the carbon fiber is in a clean state, after cleaning, the surface of the carbon fiber is modified by using an air oxidation method, oxygen-containing groups can be added on the surface of the carbon fiber while modification is carried out, the tensile strength of the surface of the carbon fiber is improved, the surface of the carbon fiber after modification can form slurry, and the surface of the carbon fiber is washed for 4-5 times by using the deionized water at normal temperature, forming a liquid film on the surface of the carbon fiber, placing the carbon fiber into an electrolytic tank provided with an anode conductive rod and a cathode conductive rod for anodic oxidation treatment, adding the carbon fiber into ammonia water with the mass fraction of 10-20% for soaking after the treatment, and finally drying, sizing and rolling the soaked carbon fiber to finish the treatment of the surface of the carbon fiber.

In the present example, the surface tackiness degree of the carbon fiber of the present example was improved by at least 2.4% to 3.8% as compared with the conventional surface tackiness degree by the surface treatment method of the carbon fiber and the conventional surface treatment method of the carbon fiber.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.