Method of preparing high strength carbon fibre

Abstract

The present invention relate to a method of preparing high strength carbon fibre. First, dipping polyacrylonitrile fibre into 2-15 wt% hydroxylamine sulfate solution modifying agent to proceed modification, and proceeding washing and physical modification of densification to the polyacrylonitrile fibre, at last getting the high strength carbon fibre through pre-oxidation and carbonizing treatment. Thereby, obtaining a method of preparing high strength carbon fibre with advantages of convenient operation, simple apparatus, almost pollution-free to environment and low cost. The carbon fibre obtained by modification has a great improvement in tensile strength.

Description

Technical field: [0001] The invention relates to a method for preparing high-strength carbon fibers. Background technique: [0002] At present, the development of carbon fiber originated in the 1950s. After more than 50 years of development, its application fields have become more and more extensive. With the development of science and technology, the requirements for carbon fiber performance are getting higher and higher. According to theoretical calculations, the tensile strength of carbon fiber should be 182.8GPa, but in fact, the carbon fiber with the highest tensile strength in the world is about 9GPa. It can be seen that the actual tensile strength of carbon fiber is much lower than the theoretically calculated tensile strength. The actual reason is that the structure of the fiber does not reach the assumed level of integrity, that is, there are structural defects. [0003] At present, the tensile strength of T-300 carbon fiber, which accounts for more than 90% of ca...

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Problems solved by technology

Literature using NiSO 4 The method for modifying the polyacrylonitrile precursor (Acta Polymer Sinica, 2001, the 5th period) increases the carbon fiber tensile strength from 2.5GPa to 3.2GPa, but its tensile strength still does not reach the T300 level, which is Limits its application in general structural composites

The literature adopts H 2 SO 4 The method of treating pre-oxidized fibers with mixed acid of HCl (Polymer Materials and Engineering, 2006, No. 4), the tensile strength of carbon fibers increased from 2.76GPa to 3.21GPa, but this method uses strong acid and requires oxidation The steps and equipment are complicated, which is not conducive to industrial production

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