Preparation method and application of sucrose carbonization modified carbon fiber

Abstract

The invention relates to a preparation method of a sucrose carbonization modified carbon fiber. The preparation method comprises the following steps that sucrose is dissolved into ethyl acetate, wherein the weight percentage ratio of the sucrose to the ethyl acetate is (2-3):(3-5); after stirring, a preimpregnation solution is prepared, a carbon fiber is immersed into the preimpregnation solution,ultrasonic dispersion is conducted for 5-10 minutes, and then, the carbon fiber is taken out for drying; the dried carbon fiber is placed into a tube furnace for high-temperature carbonization, an air atmosphere is selected, the temperature is raised to 290-300 DEG C at the temperature rise speed of 5-10 DEG C / min, heat preservation is conducted for 30-90 s, cooling is quickly conducted to room temperature, and then the sucrose carbonization modified carbon fiber is obtained. On the basis without damaging the surface of the carbon fiber, the surface roughness degree of the carbon fiber is improved, the interfacial shear strength of the carbon fiber is improved, and it is ensured that the sucrose carbonization modified carbon fiber is high in flexibility and processing performance. The sucrose carbonization modified carbon fiber is used in a composite material, the wettability and the adhesion between the carbon fiber and a substrate are improved, and the interfacial shear strength, the interfacial shear strength and the impact resistance of the composite material can be effectively improved.

Description

technical field [0001] The invention relates to a preparation method and application of sucrose carbonized modified carbon fiber. Background technique [0002] At present, in order to improve the interfacial properties of reinforced carbon fiber and resin matrix, one is to introduce active functional groups such as carbonyl, carboxyl or hydroxyl on the surface of carbon fiber to improve the wettability and chemical action of the resin on the fiber surface; the other is to consider the chemical action. From the physical point of view, improve the surface roughness of the fiber, increase the specific surface area of ​​the fiber, and increase the mechanical engagement force between the fiber and the resin; the third is to remove some weak interfacial layers of amorphous carbon on the surface of the fiber and reduce defects in carbon fiber composites . The more commonly used modification method is the chemical modification method, which has high modification efficiency and obvi...

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Problems solved by technology

Regardless of the modification method, there are more or less disadvantages such as large energy consumption, complicated modification process, and damage to the carbon fiber body.

[0003] The surface modification method of carbon fiber has been extensively studied, but most of the modified objects are general-purpose carbon fibers. This type of carbon fiber has undergone surface treatment before leaving the factory and contains a certain amount of sizing agent on the surface. Before the surface modification of carbon fiber, usually The best way is to use acetone soaking or extraction to remove the glue first. At this time, the surface properties of the carbon fiber are very different from those just out of the high carbon furnace, and then the surface treatment is carried out. The research results do not represent the real treatment effect.

In addition, although most of the surface treatment methods in the laboratory can increase the active functional groups on the surface of carbon fibers, improve the wettability, and improve the mechanical meshing effect, they ignore the effect of sizing agents.

Carbon fiber in a dry state has strong static electricity, which will cause wool and broken filaments in the fiber, which is not conducive to deep processing

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