RU2011117117A

RU2011117117A - METHOD FOR PRODUCING HIGH STRENGTH HIGH MODULAR ARAMID THREADS (OPTIONS)

Info

Publication number: RU2011117117A
Application number: RU2011117117/05A
Authority: RU
Inventors: Виктор Михайлович Щетинин (RU); Виктор Михайлович Щетинин
Priority date: 2011-05-04
Filing date: 2011-05-04
Publication date: 2012-11-10
Also published as: RU2478143C2

Abstract

1. Способ получения высокопрочных высокомодульных нитей мокрым или сухо-мокрым формованием изотропного раствора ароматического гетероциклического сополиамида в органическом растворителе с добавками леофильных солей хлористого лития или кальция с последующей промывкой, сушкой и термообработкой свежесформованных нитей в паковке под разряжением и дополнительной термовытяжкой, отличающийся тем, что термообработку осуществляют в две стадии: сначала под разряжением -0,95÷-1,0 атм в течение 10-30 мин а затем разряжение снижают до -0,75÷-0,9 атм и удерживают до окончания цикла, а перед термовытяжкой нити увлажняют до влагосодержания 1,5-8,5 вес.%, при этом термовытяжку проводят при температуре 410-450°C. ! 2. Способ получения высокопрочных высокомодульных нитей по п.1, отличающийся тем, что после термовытяжки нити доводят до влагосодержания 1,5-3,5% с последующей дополнительной термовытяжкой при температуре 410-450°C. ! 3. Способ получения высокопрочных высокомодульных нитей мокрым или сухо-мокрым формованием изотропного раствора ароматического гетероциклического сополиамида в органическом растворителе с добавками леофильных солей хлористого лития или кальция с последующей промывкой, сушкой и непрерывной термообработкой свежесформованных нитей в воздушной среде под разряжением, отличающийся тем, что термообработку ведут в трубчатой термокамере с градиентным распределением температуры по ходу движения нити от 30 до 500°C при нагрузке на нить 0,05-0,5 сН/текс и содержанием кислорода в зоне термообработки не менее 1,5%, а воздушную среду подают сопутствующим движению нитей потоком со скоростью, по меньшей мере в два раза превышающей ск 1. A method of producing high-strength high-modulus filaments by wet or dry-wet molding of an isotropic solution of an aromatic heterocyclic copolyamide in an organic solvent with the addition of leophilic salts of lithium chloride or calcium, followed by washing, drying and heat treatment of freshly formed filaments in a package under discharge and an additional heat-extension, characterized by heat treatment is carried out in two stages: first, under a pressure of -0.95 ÷ -1.0 atm for 10-30 minutes and then the pressure is reduced to -0.75 ÷ -0.9 atm and beats hold until the end of the cycle, and before the heat extractor, the threads are moistened to a moisture content of 1.5-8.5 wt.%, while the thermal extract is carried out at a temperature of 410-450 ° C. ! 2. The method of producing high-strength high-modulus threads according to claim 1, characterized in that after thermal drawing, the threads are brought to a moisture content of 1.5-3.5%, followed by an additional thermal drawing at a temperature of 410-450 ° C. ! 3. A method of producing high-strength high-modulus filaments by wet or dry-wet molding of an isotropic solution of an aromatic heterocyclic copolyamide in an organic solvent with the addition of leophilic salts of lithium chloride or calcium, followed by washing, drying and continuous heat treatment of freshly formed filaments in air under vacuum, characterized in that it is heat treated by heat treatment lead in a tubular heat chamber with a gradient temperature distribution along the direction of the thread from 30 to 500 ° C with a load on the thread of 0.05-0.5 cN / tex and the oxygen content in the heat treatment zone is not less than 1.5%, and the air medium is supplied by the concomitant movement of the threads with a stream at a speed of at least two times higher

Claims

1. A method of producing high-strength high-modulus filaments by wet or dry-wet molding of an isotropic solution of an aromatic heterocyclic copolyamide in an organic solvent with the addition of leophilic salts of lithium chloride or calcium, followed by washing, drying and heat treatment of freshly formed filaments in a package under discharge and an additional heat-extension, characterized by heat treatment is carried out in two stages: first, under a pressure of -0.95 ÷ -1.0 atm for 10-30 minutes and then the pressure is reduced to -0.75 ÷ -0.9 atm and beats hold until the end of the cycle, and before the heat extractor, the threads are moistened to a moisture content of 1.5-8.5 wt.%, while the thermal extract is carried out at a temperature of 410-450 ° C.

2. The method of producing high-strength high-modulus threads according to claim 1, characterized in that after thermal drawing, the threads are brought to a moisture content of 1.5-3.5%, followed by an additional thermal drawing at a temperature of 410-450 ° C.

3. A method of producing high-strength high-modulus filaments by wet or dry-wet molding of an isotropic solution of an aromatic heterocyclic copolyamide in an organic solvent with the addition of leophilic salts of lithium chloride or calcium, followed by washing, drying and continuous heat treatment of freshly formed filaments in air under vacuum, characterized in that it is heat treated by heat treatment lead in a tubular heat chamber with a gradient temperature distribution along the direction of the thread from 30 to 500 ° C with a load on the thread of 0.05-0.5 cN / tex and the oxygen content in the heat treatment zone is not less than 1.5%, and the air medium is supplied by the concomitant movement of the threads with a stream at a speed of at least two times the speed of the thread.