Preparation method of sizing carbon fiber for rubber-based composite material and sizing carbon fiber

• Main Authors: PANG YANHUA, HUANG XIANGYU, ZHANG BINBO, YI SHANSHAN, SONG WENDI, JI CHUNXIAO
• Format: Patent
• Language: Chinese; English
• Published: 01.03.2024
• Subjects: APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBONFILAMENTS; CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS,THREADS, FIBRES, BRISTLES OR RIBBONS; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR; LAUNDERING; NATURAL OR ARTIFICIAL THREADS OR FIBRES; SPINNING; TEXTILES; TREATMENT OF TEXTILES OR THE LIKE; TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS,FABRICS, FEATHERS, OR FIBROUS GOODS MADE FROM SUCH MATERIALS

The invention relates to the technical field of preparation of carbon fibers, and discloses a preparation method of sizing carbon fibers for a rubber-based composite material and the sizing carbon fibers. The polyacrylonitrile-based precursor is subjected to pre-oxidation, low-temperature carbonization, high-temperature carbonization, surface treatment, water washing, sizing and drying and winding to obtain sized carbon fibers; the sizing and drying process comprises the following steps: step 1, carrying out pre-sizing and pre-drying by adopting a pre-sizing agent containing polyacrylamide and polyvinyl alcohol to obtain initial carbon fibers; step 2, carrying out secondary sizing and secondary drying on the initial carbon fibers by adopting resorcinol formaldehyde latex to obtain sized carbon fibers; the contact angle of the pre-sizing agent is smaller than or equal to 30 degrees, and the surface tension is smaller than or equal to 50 mN/m. According to the method, the contact angle of the pre-sizing agent i