Drying method after carbon fiber sizing

Abstract

The invention discloses a drying method for carbon fiber having been subjected to sizing. First, tows of the carbon fiber having been subjected to sizing are pre-dried in a contact mode through a drying roller, the wrap angle of the tows of the carbon fiber on the drying roller is larger than 180 degrees, the contact time ranges from 10 s to 60 s, the surface temperature of the drying roller ranges from 100 DEG C to 150 DEG C, the tows, with the water content smaller than or equal to 1%, of the carbon fiber are obtained after pre-drying, and sizing agent is made to form film on the surfaces of the tows of the carbon fiber; then, the pre-dried tows of the carbon fiber penetrate through a drying oven to be dried in a non-contact mode, the temperature in the drying oven ranges from 100 DEG C to 250 DEG C, then, the tows, with the water content smaller than or equal to 0.1%, of the carbon fiber are obtained, the resin film can be drier and more comfortable, and the tows of the carbon fiber can be kept flat and thus are convenient to lay flat and wind. The dried tows of the carbon fiber is good in quality, hardness and widening performance of the tows can be enhanced, broken filaments are reduced, and large-scale production can be achieved.

Description

technical field [0001] The invention relates to a drying method, in particular to a drying method after carbon fiber is sized. Background technique [0002] In the production process of carbon fiber, after the carbon fiber is carbonized at high and low temperature and surface treated, in order to improve the transmission efficiency of the fiber interface layer and further modify the fiber surface, the carbon fiber will be sizing, that is, a polymer layer is coated on the fiber surface. On the one hand, sizing can protect the fiber, prevent the fiber from absorbing impurities and moisture in the air, and protect the surface active groups of the fiber; on the other hand, it has the function of clustering, which is convenient for subsequent processing and use; at the same time, it improves the wettability of the fiber and facilitates resin impregnation. Reduce the preparation time of composite materials and improve product quality. The drying of carbon fiber after sizing is to...

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Problems solved by technology

[0003] (1) There are many roller bodies, too many fiber turns, which increases the resistance during the tow running process, and it is easy to wrap around the roller when passing through the godet roller, resulting in broken filaments and increasing the amount of wool filaments, resulting in large waste and affecting the collection of carbon filaments Silk rate;

[0004] (2) The equipment is complex and occupies a large area, which is not conducive to large-scale production;

[0005] (3) The existing equipment mainly adopts electric heating, which has high energy consumption, and the heating tube is easy to wear out and difficult to replace;

[0006] (4) There are too many roller bodies, which are prone to mechanical failure and high repair and maintenance costs;

[0008] (6) The existing drying adopts the vertical drying method, and the top of the furnace must be closed for vertical drying, so that the water vapor is not easy to emit, which affects the drying effect of the tow; if the sealing is not strict, it will affect the temperature Stability, and if it is closed for a long time, it is easy to accumulate wool and tar, which will cause a fire

"So it can be seen that it is only directly dried by hot air, so the equipment is large in size, which is not conducive to large-scale production

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