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Crystal variation modification method of ambari fiber

A technology of crystal modification and fiber, applied in the field of crystal modification of kenaf fiber, can solve the problems of unevenness, decreased crystallinity, fiber erosion, etc., and achieves fiber softness, excellent softness performance, and improved dimensional stability. Effect

Inactive Publication Date: 2015-06-24
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 the kenaf 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 kenaf fiber, the kenaf fiber with a length of 100mm and a fineness of 2.5tex is placed in an airtight container, filled with liquid ammonia, and boosted in combination with a parabolic boost and a gap boost , the boost rate k all satisfy the relation In parabolic boost, the initial boost rate k 0 0.5MPa / min, pressurize to modified pressure 2Mpa; and then pressurize in intervals, the initial pressurization rate k 0 The pressure is 0.5MPa / min, the gap time is 5min, each intermittent pressure increase time is 3min, to the modified pressure of 5MPa, the pressure is maintained for 5min, and then released to 0.005Mpa at a depressurization rate of 5MPa / s within 1.2 seconds. Then, the modification medium is removed by heating and evacuating in parallel with a vacuum pump until the pressure drop in the airtight container reaches 133 Pa, at which point the crystal-modified kenaf fiber is obtained. Compared with the microscopic lattice of...

Embodiment 2

[0025] A method for crystal transformation modification of kenaf fibers. The kenaf fibers with a length of 200mm and a fineness of 4tex are placed in a closed container, filled with liquid ammonia, and boosted in combination with a parabolic boost and a gap boost. The boost rate k satisfies the relation In parabolic boost, the initial boost rate k 00.8MPa / min, pressurize to modified pressure 2Mpa; and then pressurize in intervals, the initial boost rate k 0 The pressure is 1MPa / min, the gap time is 6min, and the time for each intermittent boost is 4min, until the modified pressure is 6MPa, the pressure is maintained for 10min, and then released to 0.006Mpa at a depressurization rate of 6MPa / s within 1 second. Then, the modification 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 kenaf fiber is obtained. Compared with the microscopic lattice of the k...

Embodiment 3

[0027] A crystal change modification method of kenaf fiber, the kenaf fiber with a length of 350mm and a fineness of 4.5tex is placed in a closed container, filled with liquid ammonia, and the pressure is boosted in combination with a parabolic boost and a gap boost , the boost rate k all satisfy the relation In parabolic boost, the initial boost rate k 0 1MPa / min, pressurize to modified pressure 3Mpa; and then pressurize in intervals, initial pressurization rate k 0 The pressure is 1.5MPa / min, the gap time is 5min, and the time for each intermittent boost is 4min, until the modified pressure is 8MPa, the pressure is maintained for 5min, and then released to 0.008Mpa at a depressurization rate of 16MPa / s within 0.5 seconds. Then, the modification 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 kenaf fiber is obtained. Compared with the microscopic l...

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Abstract

The invention relates to a crystal variation modification method of ambari fiber. The crystal variation modification method comprises following steps: ambari 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 modification medium is removed, and then the crystal variation modified ambari fiber is obtained. Advantages of the crystal variation modification method are that: 1) the ambari fiber is modified by change of crystal lattice shape, original defects of the ambari fiber are eliminated, pores are enlarged, crystallinity is reduced, the ambari fiber is softened, and dimensional stability, softness and dyeing properties of the obtained products are improved; 2) instantaneous pressure release is employed, so that the modified ambari fiber expands to a highest degree, bulkiness and softness of the ambari fiber are increased greatly, and spinning, weaving and dyeing performances of the ambari fiber are improved significantly.

Description

technical field [0001] The invention relates to a crystal change modification method of kenaf fiber, in particular to a method for crystal change modification of kenaf fiber by pressurizing the modified medium to the modification pressure and holding the pressure for a period of time and releasing the pressure instantaneously . Background technique [0002] Kenaf fiber is an important textile raw material in natural fibers, and it is a fiber with a relatively large Young's modulus in natural fibers. It has excellent characteristics such as moisture absorption, breathability, heat dissipation, antibacterial, mildew resistance, radiation protection, and high strength, but it also has defects such as hardness, difficulty in spinning, weaving, and dyeing, which lead to poor wearing performance and are not easy to make into high-end textile products. Most of them are low value-added products. [0003] In order to change the above status quo, there are many modification methods,...

Claims

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Application Information

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