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A kind of crystal change modification method of flax fiber

A flax fiber and crystal modification technology, applied in the field of flax fiber crystal modification, can solve the problems of unevenness, decreased crystallinity, fiber erosion, etc. Effect

Inactive Publication Date: 2015-11-18
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 modifying 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 flax 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 modification of flax fibers. The flax fibers with a length of 50mm and a fineness of 0.1tex are placed in a closed 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 0.5MPa / min, pressurized to a modified pressure of 1.2Mpa, maintained for 3min, and then instantly released to 0.0012Mpa within 3 seconds at a depressurization rate of 0.5MPa / s. Then, the modified medium is removed by evaporation in parallel with heating and vacuum pumping, until the pressure drop in the airtight container is 133 Pa, at which point the crystal-modified flax fiber is obtained. Compared with the microscopic lattice of the flax fiber, the microscopic lattice of the crystal change modified flax fiber has a 10% increase in pores and a 13% decrease in crystallinity; the crystal change modified flax fiber and the flax fiber Compared with that, the dye up...

Embodiment 2

[0025] A method for crystal modification of flax fibers. The flax fibers with a length of 80mm and a fineness of 0.23tex are placed in a closed 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 It is 0.7MPa / min, pressurized to a modified pressure of 1.5Mpa, maintained for 5 minutes, and then released to 0.0015Mpa within 2 seconds at a depressurization rate of 1MPa / s. Then, the modified medium is removed by evaporation in parallel with heating and vacuum pumping, until the pressure drop in the airtight container is 133 Pa, at which point the crystal-modified flax fiber is obtained. Compared with the microscopic lattice of the flax fiber, the microscopic lattice of the crystal change modified flax fiber has a pore increase of 12% and a crystallinity decrease of 14%; the crystal change modification of flax fiber and the flax fiber Compared with that, the dye uptake rate ...

Embodiment 3

[0027]A method for crystal transformation modification of flax fibers. The flax fibers with a length of 150mm and a fineness of 0.3tex are placed in a closed 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 Pressurize to 0.9MPa / min, increase the pressure to a modified pressure of 1.8Mpa, hold the pressure for 6min, and release it to 0.0018Mpa within 2 seconds at a depressurization rate of 1.5MPa / s. Then, the modified medium is removed by evaporation in parallel with heating and vacuum pumping, until the pressure drop in the airtight container is 133 Pa, at which point the crystal-modified flax fiber is obtained. Compared with the microscopic lattice of the flax fiber, the microscopic lattice of the crystal change modified flax fiber has a pore increase of 14% and a crystallinity decrease of 16%; Compared with that, the dye uptake rate increased by 28%, and the color ...

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Abstract

The invention relates to a method for modifying flax fibers via crystal lattice change. The method comprises the following steps: putting flax fibers into an enclosed container; filling a modification medium; boosting to a modification pressure; releasing pressure momentarily; removing the modification medium to obtain flax fibers modified via crystal lattice change. Due to the adoption of the technical scheme, the method has the advantages that 1, the aim of modifying is fulfilled by changing a crystal lattice structure, the original defects are overcome by adopting the modified fibers, pores are increased, the degree of crystallization is lowered, fibers are soft, and the size stability, softness, dyeing performance and the like of a product are enhanced; 2, a method for releasing pressure momentarily is adopted, so that modified fibers expand to the maximum extent, the bulkiness and softness of the fibers are enhanced greatly, and the spinning, weaving and dyeing performance of the fibers is enhanced greatly.

Description

technical field [0001] The invention relates to a method for crystal change modification of flax fiber, in particular to a method for crystal change modification of flax fiber by pressurizing a modification medium to a modification pressure and keeping the pressure for a period of time and releasing the pressure instantaneously. Background technique [0002] Flax 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. The vast majority of textile flax fibers are low value-added products. [0003] In order to change the above status quo, there are many modification methods, such as physical modification methods, chemical modification m...

Claims

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Application Information

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Patent Type & Authority Patents(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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