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A kind of compound crystal transformation modification method of cotton fiber

A cotton fiber and composite crystal technology, applied in the field of cotton fiber composite crystal modification, can solve the problems of insignificant reduction of crystallinity, non-uniformity, fiber erosion, etc., and achieves improved dimensional stability, excellent softness, and no medium. The effect of loss

Inactive Publication Date: 2015-10-21
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 cotton fibers, but this method only requires one modification, and the swelling is not complete, and the crystallinity The reduction is not obvious, and the dyeing performance has not been significantly improved

Method used

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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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A method for compound crystal modification modification of cotton fibers, the cotton fibers with a length of 10mm and a fineness of 0.05tex are placed in a closed container, filled with liquid ammonia, and pressurized at a constant speed of 0.1MPa / min to The modified pressure is 0.5Mpa, the pressure is maintained for 1min, and then released to 0.005Mpa within 5 seconds at a depressurization rate of 0.1MPa / s, and finally the material is removed by high-speed centrifugal dehydration, microwave heating and vacuum pumping. Modified medium, that is to obtain composite crystal modification modified cotton fiber. Among them, the high-speed centrifugal rotation speed reaches 100rpm, the rotation time can reach 10min, and the radial draft can reach 1mm; the power of a single modified kettle in microwave heating is 1kW; the vacuum is pumped to negative pressure and below. Compared with the microscopic lattice of the cotton fiber, the microscopic lattice of the composite crystal m...

Embodiment 2

[0028]A method for compound crystal modification modification of cotton fibers, the cotton fibers with a length of 18mm and a fineness of 0.18tex are placed in a closed container, filled with liquid ammonia, and pressurized at a constant speed of 0.2MPa / min to The modified pressure is 0.8Mpa, the pressure is maintained for 5min, and then released to 0.008Mpa within 5 seconds at a depressurization rate of 0.2MPa / s. Finally, the evaporation method of high-speed centrifugation, microwave heating and vacuum pumping is used to remove the material. Modified medium, that is to obtain composite crystal modification modified cotton fiber. Among them, the high-speed centrifugal rotation speed reaches 120rpm, the rotation time can reach 10min, and the radial draft can reach 1.5mm; the power of a single modified kettle in microwave heating is 5kW; the vacuum is pumped to negative pressure and below. Compared with the microscopic lattice of the cotton fiber, the microscopic lattice of the ...

Embodiment 3

[0030] A method for compound crystal modification modification of cotton fibers, the cotton fibers with a length of 50mm and a fineness of 0.22tex are placed in a closed container, filled with liquid ammonia, and pressurized at a constant speed of 0.2MPa / min to The modified pressure is 1Mpa, the pressure is maintained for 8min, and then released to 0.001Mpa within 3 seconds at a depressurization rate of 0.5MPa / s. Finally, the evaporation method of high-speed centrifugation, microwave heating and vacuum pumping is used to remove the impurities in the material. The modified medium is to obtain the composite crystal-modified cotton fiber. Among them, the high-speed centrifugal rotation speed reaches 140rpm, the rotation time can reach 10min, and the radial draft can reach 2mm; the power of a single modified kettle in microwave heating is 15kW; the vacuum is pumped to negative pressure and below. Compared with the microscopic lattice of the cotton fiber, the microscopic lattice of...

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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Abstract

The invention relates to a composite crystal change modification method of cotton fiber. According to the method, the cotton fiber is placed in a closed container, a modification medium is added, pressure is raised to modification pressure, then, the pressure is released instantly, the combined effect of vacuumization, high-speed centrifugal rotation and drafting and microwave is used for removing the modified medium, and therefore composite crystal change and modified cotton fiber can be obtained. According to the crystal change and modified cotton fiber, pores are increased, degree of crystallinity is reduced, the fiber is soft, and size stability, flexibility, dyeing performance and the like of products are improved; the method of pressure instant release is adopted, and the fluffiness and flexibility of the fiber are improved greatly; the combined effect of vacuumization, high-speed centrifugal rotation and drafting and microwave is adopted, therefore, fiber quality is further improved, and modification efficiency is greatly improved.

Description

technical field [0001] The invention relates to a method for modifying cotton fiber by compound crystal transformation. It is a method of increasing the pressure of the modified medium to the modified pressure, keeping the pressure for a period of time, and then releasing the pressure instantaneously, and then adopting vacuum pumping, high-speed centrifugal rotation drafting and Cotton fiber compound crystal transformation modification method with combined action of microwave and removal of modification medium. Background technique [0002] Cotton fiber is slender and soft, has good hygroscopicity, strong alkali resistance, organic solvent resistance, bleach resistance, heat insulation and heat resistance, and is the largest natural fiber. However, its elasticity and elastic recovery are poor, it is easy to mold and flammable, the energy consumption and pollution of dyeing are relatively large, and the dyeing rate and color fastness are not high. [0003] In order to change...

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