Crystal lattice change modification method of ramie fiber

A technology of ramie fiber and crystal change modification, which is applied in the field of ramie fiber crystal change modification, can solve problems such as crystallinity reduction, unevenness, and fiber erosion, and achieve improved dimensional stability, fiber softness, and excellent softness. 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

[0023] A method for crystal transformation modification of ramie fibers, the ramie fibers with a length of 50mm and a fineness of 0.4tex 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 relational expression 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. Then, the modification medium was removed by evaporation in parallel with heating and vacuum pumping, until the pressure drop in the airtight container was 133 Pa, at which point the crystal-modified ramie fiber was obtained. Compared with the microscopic lattice of the ramie fiber, the microscopic lattice of the crystal-change modified ramie fiber has an increase of 11% and a 20% decrease in crystallinity; Compared with that, the dye uptake rate increased by 25%, and...

Embodiment 2

[0025] A method for crystal transformation modification of ramie fibers. The ramie fibers with a length of 200mm and a fineness of 0.6tex are placed in an airtight container, filled with liquid ammonia, and boosted in a linear boosting manner. The boosting rate k satisfies the relational expression 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. Then, the modification medium was removed by evaporation in parallel with heating and vacuum pumping, until the pressure drop in the airtight container was 133 Pa, at which point the crystal-modified ramie fiber was obtained. Compared with the microscopic lattice of the ramie fiber, the microscopic lattice of the crystal change modified ramie fiber has a pore increase of 12%, and the crystallinity decreases by 21%; the crystal change modified ramie fiber and the ramie fiber ...

Embodiment 3

[0027]A method for crystal transformation modification of ramie fibers. The ramie fibers with a length of 500mm and a fineness of 0.8tex are placed in an airtight container, filled with liquid ammonia, and the pressure is boosted in a linear boosting manner. The boosting rate k satisfies the relational expression 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. Then, the modification medium was removed by evaporation in parallel with heating and vacuum pumping until the pressure in the closed container dropped to 133 Pa, at which point the crystal-modified ramie fiber was obtained. Compared with the microscopic lattice of the ramie fiber, the microscopic lattice of the crystal change modified ramie fiber has a pore increase of 14%, and the crystallinity decreases by 23%; Compared with that, the dye uptake rate increased by 30%,...

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Abstract

The invention relates to a crystal lattice change modification method of ramie fiber. The method is characterized in that the ramie fiber is placed in a sealed container, modifying media are filled, the pressure is boosted to the modification pressure, then, the pressure is instantaneously released, the modifying media are removed, and the ramie fiber modified crystal lattice change is obtained. Through adopting the technical scheme, the crystal change modification method has the following advantages that 1, the modification goal is reached through changing the crystal lattice structure, the modified fiber overcomes the original defects, the pores are enlarged, the crystallinity degree is reduced, the fiber is soft, and the size stability, the softness and the dyeing performance of products are improved; 2, the method of instantaneously releasing the pressure is adopted, the modified fiber expands to the greatest degree, and the bulkiness and the softness of the fiber are greatly improved, so the spinning, weaving and dyeing performance of the fiber is greatly improved.

Description

technical field [0001] The invention relates to a method for crystal transformation modification of ramie fiber, in particular to a method for crystal transformation modification of ramie fiber by pressurizing a modification medium to a modification pressure and holding the pressure for a period of time and releasing the pressure instantaneously. Background technique [0002] Ramie fiber is an important textile raw material in natural fibers, and it is the fiber with the largest Young's modulus in natural fibers. It has the advantages of moisture absorption, breathability, heat dissipation, antibacterial, mildew resistance, radiation protection, and high strength, but it also has defects such as hardness, wrinkling, shrinkage, difficulty in spinning, weaving, and dyeing, which lead to poor wearing performance and difficult to make. Most of the high-end textile ramie fibers are low-value-added products. [0003] In order to change the above status quo, there are many modific...

Claims

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Application Information

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