Aramid III fiber with fluorine-containing surface and preparation method thereof

Abstract

The invention discloses an aramid III fiber with a fluorine-containing surface, which is characterized in that: the surface of the fiber contains a carbon-fluorine covalent bond structure and a carboxyl-hydroxyl group; the contact angle between the surface of the fiber and water is 68 to 82 degrees; the shear strength between composite material layers prepared from the fiber is 47.3 to 55 MPa; and the tensile strength of gum dipped filaments is 4.6 to 5.4 GPa, and the tensile modulus is 145 to 168 GPa. The invention also discloses a method for preparing the aramid III fiber with the fluorine-containing surface. The fiber surface hydrophilicity of the aramid III fiber subjected to fluoridation is obviously improved; and the shear strength between the prepared composite material layers, and the tensile strength and the tensile modulus of the gum dipped filaments all can be improved by 20 to 30 percent. The method has the advantages of high fluoridation rate, short treatment time, can continuous surface treatment for the fiber on line, high stability of the surface activation effect after treatment, low cost and good application prospects.

Description

technical field [0001] The invention belongs to the technical field of aramid fiber III and its preparation, and in particular relates to a surface fluorine-containing aramid III fiber and a preparation method thereof. Background technique [0002] Compared with aircraft parts manufactured by traditional metal materials and methods, the integrated design and manufacture of fiber-reinforced resin-based composite materials can not only reduce the weight of aircraft parts by 20-30%, but also reduce the use and maintenance costs by 15-25% compared with metal materials. , so it has been widely used in aerospace field. It is understood that the amount of resin-based composite materials used in aircraft has reached more than 50% of its structural weight. [0003] Although composite materials have been widely used in the aerospace field due to their light weight, their mechanical properties cannot fully meet the requirements for use in the aerospace field. There are two main reaso...

AI Technical Summary

Problems solved by technology

Although the surface activity and shear bonding strength of the surface of the material treated by oxyfluorination are obviously improved, but the fluorination rate is obviously reduced due to the oxygen contained in the fluorination mixture.

At the same time, because the fluorinated mixed gas also contains water vapor, the combination of hydrogen fluoride and water produced in the fluorinated process will cause serious corrosion to the fluorinated equipment

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