FIELD: polymer production.
SUBSTANCE: invention relates to technology of manufacturing threads and fibers from aromatic copolyamide and can be used in manufacture of special-destination composite materials and fabrics with elevated performance characteristics suitable to fabricate special protective clothing and the like. Method comprises three-step dissolution of 5(6)-amino-(p-aminophenyl)benzimidazole in aprotic organic solvent in presence of lithium salt. In the first step, crystalline 5(6)-amino-(p-aminophenyl)benzimidazole having melting point 239±1°C is completely dissolved, after which 40:60 to 60:40 mixture thereof with the same benzimidazole having melting point 215±5°C is added and, after complete dissolution of the mixture, crystal hydrate of 5(6)-amino-(p-aminophenyl)benzimidazole with melting point 140±10°C and content of water 2.0-2.7% is added. Thereafter, low-temperature polycondensation is carried out with participation of terephthalic acid dichloride and optional p-phenylenediamine. Resulting polycondensation solution is deaerated and molded into precipitation bath by wet manner. Gel-like threads obtained are stretched to 100%, washed, dried, and thermally treated at 340°C.
EFFECT: improved thermal and physico-mechanical properties of threads and fibers.
4 cl, 4 tbl, 7 ex
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