Compound crystal variation modification method of ramie fiber
A ramie fiber and composite crystal technology, which is applied in the field of ramie fiber composite crystal change modification, can solve problems such as crystallinity reduction, unevenness, and fiber erosion, and achieve improved dimensional stability, excellent softness, and no dielectric loss. Effect
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Embodiment 1
[0026] A compound crystal transformation modification method of ramie fibers, the ramie fibers with a length of 50mm and a fineness of 0.4tex are placed in an airtight container, filled with liquid ammonia, and the pressure is boosted in a linear boosting manner, and the boosting rate k satisfies the relation Mode Initial boost rate k 0 The pressure is 0.5MPa / min, pressurized to a modified pressure of 2Mpa, maintained for 5min, and then released to 0.002Mpa within 2 seconds at a depressurization rate of 2MPa / s. Finally, the modification medium in the material was removed by high-speed centrifugal spin dehydration, microwave heating and vacuuming in parallel to obtain the composite crystal-modified ramie fiber. Among them, the high-speed centrifugal rotation speed reaches 180rpm, the rotation time can reach 10min, and the radial draft reaches 2.5mm; the power of a single modified kettle in microwave heating is 1kW; the vacuum is pumped to negative pressure and below. Compare...
Embodiment 2
[0028] A compound crystal transformation modification method of ramie fibers, the ramie fibers with a length of 100mm and a fineness of 0.6tex are placed in a closed container, filled with liquid ammonia, and the pressure is boosted in a linear boosting manner, and the boosting rate k satisfies the relation Mode Initial boost rate k 0 The pressure is 0.8MPa / min, pressurized to a modified pressure of 3Mpa, maintained for 8min, and then instantly released to 0.003Mpa within 1 second at a depressurization rate of 3MPa / s. Finally, the modification medium in the material was removed by high-speed centrifugal spin dehydration, microwave heating and vacuuming in parallel to obtain the composite crystal-modified ramie fiber. Among them, the high-speed centrifugal rotation speed reaches 250rpm, the rotation time can reach 10min, and the radial draft can reach 3mm; the power of a single modified kettle in microwave heating is 5kW; the vacuum is pumped to negative pressure and below. ...
Embodiment 3
[0030] A compound crystal transformation modification method of ramie fibers, the ramie fibers with a length of 280mm and a fineness of 0.8tex are placed in a closed container, filled with liquid ammonia, and the pressure is boosted in a linear boosting manner, and the boosting rate k satisfies the relation Mode Initial boost rate k 0 The pressure is 1MPa / min, boosted to a modified pressure of 3.5Mpa, maintained for 8min, and then released to 0.0035Mpa within 1 second at a depressurization rate of 3.5MPa / s. Finally, the modification medium in the material was removed by high-speed centrifugal spin dehydration, microwave heating and vacuuming in parallel to obtain the composite crystal-modified ramie fiber. Among them, the high-speed centrifugal rotation speed reaches 300rpm, the rotation time can reach 10min, and the radial draft can reach 3mm; the power of a single modified kettle in microwave heating is 15kW; the vacuum is pumped to negative pressure and below. Compared w...
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