| 摘要 |
PURPOSE:To obtain reinforcing carbon fibers extremely improving electrical conductivity between matrix resin and composite material, by coating the surface of carbon fibers with a copolymer comprising a diamine, a dicarboxylic acid, a cyclic amide and a specific ratio of a glycidylated polyalkylene oxide derivative. CONSTITUTION:A diamine compound [shown by formula I (R<3> is <=15C alkyl)] is copolymerized with a dicarboxylic acid compound [shown by formula II (R<4> is <=15C alkyl, etc.)], a cyclic amide [shown by formula III (R<5> is <=20C alkyl) and a glycidylated polyalkylene oxide derivative shown by formula IV (R<1> is H or <=20C alkyl; R<2> is H is methyl; n is 1-40) to give a sizing agent for carbon fibers, comprising a copolymer containing 10-30wt.% glycidylated polyalkylene oxide derivative as a monomer composition. The sizing agent is added to chopped strands, which are dried, blended with a matrix resin, especially acrylonitrile-butadiene styrene resin, etc., injection molded to give a resin reinforced with the carbon fibers having more extremely improved electrical conductivity than an existing carbon fiber reinforced resin. |
