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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

Inactive Publication Date: 2013-12-11
DONGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Liquid ammonia modification has similar effects to alkali mercerizing treatment, such as the disappearance of natural curls, rounded cross-section, and smaller inner cavity, but the residual lye of alkali mercerizing modification is not easy to remove and will also cause fiber erosion and unevenness The main difference is that the effect of liquid ammonia modification is better than that of alkali mercerizing modification
Domestically, liquid ammonia is used as the modified medium, and the conventional method of boosting pressure in a closed container—holding pressure—recycling the modified medium in the fiber has a certain effect on the ramie fiber, but this method only requires one modification, and the swelling is not complete. The reduction is not obvious, and the dyeing performance has not been significantly improved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

The invention relates to a compound crystal variation modification method of ramie fiber. The compound crystal variation modification method comprises following steps: the ramie fiber is delivered into a sealed container; a modification medium is added; the pressure of the sealed container is increased to be as large as a modification pressure, and then is decreased instantaneously; the ramie fiber is subjected to vacuumization, high speed centrifugation spinning drafting and microwave radiation; and the modification medium is removed so as to obtain the compound crystal variation modified ramie fiber.

Description

technical field [0001] The invention relates to a method for compound crystal transformation modification of ramie fiber, which is a method of raising the pressure of the modified medium to the modified pressure, maintaining the pressure for a period of time, and then releasing the pressure instantaneously, and then adopting vacuum pumping, high-speed centrifugal rotation drafting and A combined crystal transformation modification method of ramie fiber with combined action of microwave and removal of modifying medium. Background technique [0002] Ramie fiber is an important textile raw material among natural fibers. It has the advantages of excellent hygroscopicity, low static electricity, strong warmth retention, anti-corrosion and heat resistance, etc., but there are also defects such as hardness, wrinkling, shrinkage, difficulty in spinning, weaving, and dyeing, which lead to poor wearing performance and are not easy to make high-end products. Most of the textile ramie ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06M11/61D06B5/14D06B15/00D06M101/06
Inventor 孟婥黄双孙以泽徐洋
Owner DONGHUA UNIV
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