Crystal lattice change modification method for viscose fiber

A technology of viscose fiber and crystal transformation modification, which is applied in the direction of fiber treatment, plant fiber, liquid/gas/steam treatment of a certain length of textile materials, etc., and can solve problems such as unevenness, crystallinity reduction, and fiber erosion. Achieve excellent softness, improve dimensional stability, and soft fibers

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 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 viscose fiber, but this method only requires one modification, and the swelling is not complete and crystallization The degree of 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 crystal change modification method of viscose fiber, the viscose fiber with a length of 20mm and a fineness of 0.06tex is placed in a closed container, filled with liquid ammonia, and pressurized at a constant speed of 0.1MPa / min To the modified pressure of 0.5Mpa, keep the pressure for 1min, and then release it to 0.005Mpa within 5 seconds at a depressurization rate of 0.1MPa / 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 viscose fiber is obtained. Compared with the microscopic lattice of the viscose fiber, the micro-lattice of the crystal-modified viscose fiber has a pore increase of 8% and a crystallinity reduction of 10%; Compared with the viscose fiber mentioned above, the dye uptake rate is increased by 18%, and the color fastness is increased by 15%.

Embodiment 2

[0025] A crystal change modification method of viscose fiber, the viscose fiber with a length of 50mm and a fineness of 0.18tex is placed in a closed container, filled with liquid ammonia, and pressurized at a constant speed of 0.2MPa / min To the modified pressure of 0.8Mpa, keep the pressure for 3min, and then release it to 0.008Mpa within 4 seconds at a depressurization rate of 0.2MPa / 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 viscose fiber is obtained. Compared with the microscopic lattice of the viscose fiber, the microscopic lattice of the crystal-modified viscose fiber has a 9% increase in porosity and a 10% decrease in crystallinity; the crystal-modified viscose fiber and the Compared with the above-mentioned viscose fiber, the dye uptake rate is increased by 20%, and the color fastness is increased by 16%.

Embodiment 3

[0027] A crystal change modification method of viscose fiber, the viscose fiber with a length of 80mm and a fineness of 0.22tex is placed in a closed container, filled with liquid ammonia, and pressurized at a constant speed of 0.3MPa / min To the modified pressure of 1Mpa, keep the pressure for 5min, and then release it to 0.001Mpa within 5 seconds at a depressurization rate of 0.2MPa / 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 viscose fiber is obtained. Compared with the microscopic lattice of the viscose fiber, the microscopic lattice of the crystal change modified viscose fiber has a pore increase of 10% and a crystallinity reduction of 15%; Compared with the above-mentioned viscose fiber, the dye uptake rate is increased by 21%, and the color fastness is increased by 19%.

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Abstract

The invention relates to a crystal lattice change modification method for a viscose fiber. The crystal lattice change modification method comprises the following steps of placing the viscose fiber in a closed container; filling a modifying medium into the closed container; boosting the closed container to a modifying pressure and then instantaneously releasing the pressure; removing the modifying medium to obtain a crystalloblast modified viscose fiber. The invention adopting the technical scheme has the advantages that firstly, the aim of modifying is achieved by changing a crystal lattice structure, the modified fiber overcomes original defects, is increased in porosity, reduced in crystallinity degree and is soft, and the dimensional stability, the softness, dyeing performances and the like of products are improved; secondly, by adopting a method of instantaneously releasing the pressure, the modified fiber expands to the maximum degree and the bulkiness and the softness of the fiber are greatly improved, and thus the spinning, weaving and dyeing performances of the fiber are greatly improved.

Description

technical field [0001] The invention relates to a viscose fiber crystal change modification method, in particular to a viscose fiber crystal change modification method by pressurizing the modified medium to the modification pressure and holding the pressure for a period of time and releasing the pressure instantly . Background technique [0002] Viscose fiber feels soft and glossy, has good hygroscopicity, air permeability and dyeing performance, but its development is restricted due to its poor elasticity, easy wrinkle and difficult recovery of fabrics and other weaknesses. [0003] In order to change the above status quo, there are many modification methods, such as physical modification methods, chemical modification methods and biological modification methods. Physical modification methods mainly include discharge technology modification, high-pressure steam flash explosion modification, ultrasonic cavitation and microwave irradiation modification, liquid ammonia proces...

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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