提高酚醛基纤维耐热性的表面处理方法

The Surface Treatment Method for Improve the Thermal Stability of the Phenolic Fiber

用硼酸,磷酸和硫酸配制得一种纤维表面浸渍处理液,然后将用热塑性酚醛树脂为原料经熔融纺丝制得的固化纤维用浸渍处理溶液高温处理,可以明显提高纤维的残炭率和耐热性.采用电子扫描显微镜、热分析仪、纤维强力仪和金相显微镜对处理后纤维进行了测试和表征.结果表明:这种处理工艺可以明显提高酚醛纤维在无氧气氛下的耐热性和残碳率.经过处理后,纤维在无氧状态下的残碳率比没处理前大大提高,从600～1000℃,处理后纤维的残碳率比原未处理纤维的残碳率一直保持高7%～10%左右,但是对纤维的直径、拉伸强度和结构无影响或影响甚小.

A impregnating solution which consisted of boric acid,phosphoric acid and sulfuric acid was successfully prepared.Then the phenolic fiber from thermosplastic phenolic resin by melting spinning was impregnated using the impregnating solution at high-temperature to improve its thermal stability and carbon yield.The phenolic fiber treated were characterized by scanning electron microscopy(SEM),the thermal analysis meter,fiber strength tester and metallographic microscope.Results showed that,the phenolic fiber treated has better thermal stability and higher carbon yield than the phenolic fiber untreated.The carbon yield of phenolic fiber treated continuously maintained high 7%-10% compared to the fiber untreated from 600℃ to 1000℃ under the non-oxygen condition,but the diameter,textile strength and structure of fiber does not influenced or the influence is very little.