发明名称 |
PROCESS FOR MAKING PARA-ARAMID FIBERS HAVING HIGH TENACITY AND MODULUS BY MICROWAVE ANNEALING |
摘要 |
A process is disclosed for heating never-dried para-aramid fibers containing 20 to 200 wt % water, based on dry polymer weight to form a fiber having a modulus of greater than 800 gpd while retaining a high tenacity. The fibers are heated in one or more microwave resonant cavity applicators to a temperature of 250 DEG C. to 425 DEG C. and preferably 270 DEG C. to 310 DEG C. while under a tension of 0.2 to 10 grams per denier. The preferred para-aramid is poly(p-phenylene terephthalamide). Fibers having a density of less than 1.43 g/cc can be made; and fibers having moduli greater than 1100 gpd can be made.
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申请公布号 |
US5175239(A) |
申请公布日期 |
1992.12.29 |
申请号 |
US19900634796 |
申请日期 |
1990.12.27 |
申请人 |
E. I. DU PONT DE NEMOURS AND COMPANY |
发明人 |
GAUNTT, SIBBLEY P.;HUANG, HUA-FENG |
分类号 |
D01F6/60;D02J13/00 |
主分类号 |
D01F6/60 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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