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Crystal variation modification method

A technology of crystal change modification and modification, which is applied in the field of crystal change modification of textile materials and crystal change modification of textile materials. It can solve problems such as crystallinity reduction, unevenness, and fiber erosion, and improve dimensional stability. , Excellent softness and wide application range

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 only has a certain effect on fibers with small Young’s modulus and low hardness in cotton and hemp fibers , but this method has only one modification, the swelling is not complete, the degree of crystallinity is not significantly reduced, and the softness performance has not been significantly improved
And, the prior art has little effect on high-hard fibers such as ramie, jute, hemp, sisal

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

[0028] A method for crystal change modification of cotton fibers. The modified cotton fibers are placed in a closed container, filled with liquid ammonia, and pressurized at a constant speed of 0.1 MPa / min to a modified pressure of 0.5 MPa, and the pressure is maintained. 1min, and then released to 0.005Mpa instantaneously within 5 seconds at a depressurization rate of 0.1MPa / s, and then the modified medium was removed by heating and vacuuming in parallel to obtain crystal-modified cotton fibers. Compared with the microscopic lattice of the cotton fiber, the micro-lattice of the crystal-modified cotton fiber has a pore increase of 8% and a crystallinity reduction of 10%; the crystal-modified cotton fiber material and the cotton Compared with fiber, the dye uptake rate increased by 15%, and the color fastness increased by 12%.

Embodiment 2

[0030] A method for crystal modification of ordinary viscose fiber, the modified ordinary viscose fiber is placed in a closed container, filled with liquid ammonia, and pressurized at a constant speed of 0.3MPa / min to the modified pressure 0.5MPa, keep the pressure for 5min, then release it to 0.005MPa within 5 seconds at a depressurization rate of 0.2MPa / s, and then remove the modified medium by heating and vacuuming in parallel to obtain a crystal-modified ordinary viscose glue fiber. Compared with the microscopic lattice of the ordinary viscose fiber, the microscopic lattice of the crystal change modified ordinary viscose fiber has a pore increase of 10% and a crystallinity reduction of 12%; the crystal change modified ordinary viscose Compared with the common viscose fiber, the fiber material has a 19% increase in dye uptake and a 16% increase in color fastness.

Embodiment 3

[0032] A method for crystal transformation modification of high wet modulus viscose fibers, the modified high wet modulus viscose fibers are placed in an airtight container, filled with liquid ammonia, and pressurized at a constant speed of 0.3 MPa / min. Press down to the modification pressure of 0.8MPa, keep the pressure for 5min, and release it to 0.008MPa within 5 seconds at a decompression rate of 0.3MPa / s, and then remove the modification medium by heating and vacuuming in parallel to obtain the crystal Modified high wet modulus viscose fiber. Compared with the microscopic lattice of the high wet modulus viscose fiber of the crystal change modified high wet modulus viscose fiber, the porosity increases by 11%, and the crystallinity decreases by 12%; the crystal Compared with the high wet modulus viscose fiber, the modified high wet modulus viscose fiber material has a 20% increase in dye uptake and a 13% increase in color fastness.

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 crystal variation modification method, and especially relates to a crystal variation modification method for textile materials. The crystal variation modification method comprises following steps: material to be modified 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; and the modification medium is removed, and then the crystal variation modified material is obtained. Advantages of the crystal variation modification method are that: 1) application range is wide, the crystal variation modification method can be used for modification of natural fibers such as cotton fiber and all kinds of bast fibers, and also for modification of viscose fiber; 2) the material is modified by change of crystal lattice shape, original defects of the material are eliminated, pores are enlarged, crystallinity is reduced, fibers are softened, and dimensional stability, softness and dyeing properties of the obtained products are improved; 3) instantaneous pressure release is employed, so that the modified fiber expands to a highest degree, bulkiness and softness of the fiber are increased greatly, and spinning, weaving and dyeing performances of the fiber are improved significantly.

Description

technical field [0001] The present invention relates to a method of crystal change modification, in particular to a method of crystal change modification of textile materials, specifically a method of pressurizing the modification medium to the modification pressure and holding the pressure for a period of time to release Method for crystal transformation modification of textile materials under pressure. 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, and it is easy to mold and burn. Hemp fiber is an important textile raw material in natural fibers, and it is a high-rigidity fiber with a large Young's modulus in natural fibers, especially ramie, jute, hemp, sisal, pineapple, etc. are the most representative. It has the advantages of mois...

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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IPC IPC(8): D06M11/61D06B5/14D06B5/16D06B5/22D06B15/00D06M101/06
Inventor 孙以泽孟婥黄双孙志军
Owner DONGHUA UNIV
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