Method for preparing titanium dioxide coating on surface of carbon fiber

Abstract

The invention relates to a method for preparing a titanium dioxide coating on the surface of carbon fiber. The method is characterized by comprising the following steps of: mixing titanium alkoxide with absolute ethyl alcohol according to a proportion of 1: 4 to form a sol mixture, and adjusting a pH value to 1-2 through acetic acid; drying the carbon fiber for 30min at a temperature of 100 DEG C, soaking the carbon fiber to the sol mixture, and clamping and pressing the carbon fiber by using an automatic padding machine so that the sol mixture is coated onto the carbon fiber; when the sol mixture is uniformly coated onto the carbon fiber, drying for 10min at a temperature of 80 DEG C for evaporating residual ethanol; and then curing at a temperature of 100 DEG C. According to the invention, the sol mixture is formed at normal temperature, so that requirements on manufacturing conditions can be greatly reduced. According to the method disclosed by the invention, thickness of the coating can be controlled. The carbon fiber with the titanium dioxide coating prepared by using the method disclosed by the invention keeps the flexibility and the knittability of coating-free carbon fiber, and simultaneously solves the problems that interfacial wettability and compatibility between the carbon fiber and certain composite material substrates are poor.

Description

technical field [0001] The invention belongs to the technical field of surface treatment, and in particular relates to a method for preparing a titanium dioxide coating on the surface of carbon fibers. Background technique [0002] Carbon fiber is a commonly used reinforcing fiber for composite materials. It has excellent characteristics such as low density, high strength, high modulus, low thermal expansion, radiation resistance, easy weaving and processing, and good thermal and electrical properties. widely used in matrix composites. However, the oxidation resistance of carbon fiber is poor, and there is obvious weight loss and strength reduction in the air above 400 °C, and the wettability of carbon fiber and some matrix is ​​not good, so it is difficult to form a composite material with high density and excellent performance. Therefore, it hinders the application of carbon fiber in aerospace and other fields that require lightweight, high-strength, and high-modulus mat...

AI Technical Summary

Problems solved by technology

Dong Xingguang et al. published "High Temperature Oxidation of Carbon Fiber Coated by Radio Frequency Method" in "Fiber Composite Materials" (2005, Issue 03, pp. 28-31). : Chemical vapor deposition is carried out by heating carbon fibers at 700-800°C. This method is easy to cause damage to the surface of carbon fibers, and the control process requirements of the preparation process are high, the equipment is complex, and it is not suitable for large-scale production.

Coatings in the prior art are prepared by chemical vapor deposition, physical vapor deposition, electrochemical methods, and sol-gel infiltration and sintering methods, and the most widely used method is the sol-gel infiltration and sintering method to prepare coatings, but this method Need to go through high temperature curing process, which is not conducive to the implementation of energy saving and environmental protection