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Use of a high molecular compound as a sizing agent for carbon fibers and a method for manufacturing carbon fibers with such a sizing agent
Use of a high molecular compound as a sizing agent for carbon fibers and a method for manufacturing carbon fibers with such a sizing agent
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机译:高分子化合物作为碳纤维的上浆剂的用途以及使用该上浆剂的碳纤维的制造方法
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摘要
The sizing agent for carbon fiber according to the invention is characterized by containing a high molecular compound having a weight average molecular weight of not less than 10,000 as obtainable by reacting (A) a polyalkylene oxide compound having a weight average molecular weight of not less than 100 as obtainable by addition-polymerizing an ethylene oxide-containing alkylene oxide with an organic compound containing two active hydrogen groups with (B) a polycarboxylic acid or the corresponding anhydride or lower alkyl ester or a diisocyanate. The sizing agent not only inhibits napping and binds fiber but, because of its good thermal decomposition behavior, does not cause glueing of fiber so that a substantial upgrading of carbon fiber is achieved without detracting from its strength. Furthermore, as the sizing agent does not become a tar, deposits within the carbonizing furnace are minimized and the trouble of furnace obstruction prevented.
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