Unlock instant, AI-driven research and patent intelligence for your innovation.

A kind of crystal change modification method of ramie fabric

A technology of crystal transformation modification and ramie, which is applied in the treatment of textile materials, plant fibers, textiles and papermaking, etc. It can solve the problems of insignificant crystallinity reduction, fabric erosion, and difficult removal of residual lye, and achieve softness. Excellent effect of improving dimensional stability

Inactive Publication Date: 2015-10-21
DONGHUA UNIV +1
View PDF2 Cites 0 Cited by
  • 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 fabric 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 fabric has a certain effect on cotton fabrics, but the modification effect on ramie fabrics is poor, and the method Only one modification, the swelling is not complete, the degree of crystallinity is not significantly reduced, 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
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A method for crystal modification modification of ramie fabrics. The ramie fabrics of 5 pieces×5 pieces and 250 pieces / 10cm×100 pieces / 10cm are placed in a closed container, filled with liquid ammonia, and the pressure is increased according to a linear pressure boosting method. The pressure rate k satisfies the relation Initial boost rate k 0 It is 0.5MPa / min, the pressure is increased to the modified pressure of 1.5Mpa, the pressure is maintained for 1min, and then it is instantly released to 0.0015Mpa at a depressurization rate of 3MPa / s within 5 seconds. Then, the modified medium is removed by the evaporation method in parallel with heating and vacuum pumping, until the pressure in the airtight container drops to 133Pa, that is, the crystal-modified ramie fabric is obtained. Compared with the micro-lattice of the ramie fabric, the micro-lattice of the crystal-modified ramie fabric has a 17% increase in pores and a 22% decrease in crystallinity; Compared with the ...

Embodiment 2

[0025] A method for crystal modification modification of ramie fabrics. The ramie fabrics of 32 pieces×32 pieces and 171 pieces / 10cm×192 pieces / 10cm are placed in an airtight container, filled with liquid ammonia, and the pressure is increased in a linear pressure boosting manner. The pressure rate k satisfies the relation Initial boost rate k 0 It is 0.8MPa / min, the pressure is increased to the modified pressure of 2Mpa, the pressure is maintained for 5min, and then released to 0.002Mpa at a depressurization rate of 3MPa / s within 5 seconds. Then, the modified medium is removed by the evaporation method in parallel with heating and vacuum pumping, until the pressure in the airtight container drops to 133Pa, that is, the crystal-modified ramie fabric is obtained. Compared with the micro-lattice of the ramie fabric, the micro-lattice of the crystal-modified ramie fabric has an increase of 18% in pores and a decrease in crystallinity by 23%; Compared with the ramie fabric, the...

Embodiment 3

[0027]A method for crystal change modification of ramie fabrics, the ramie fabrics of 21 pieces × 36 pieces, 311 pieces / 10cm x 304 pieces / 10cm are placed in a closed container, filled with liquid ammonia, and the pressure is boosted in a linear boosting manner. The pressure rate k satisfies the relation Initial boost rate k 0 The pressure is 1MPa / min, pressurized to a modified pressure of 3Mpa, maintained for 5min, and then instantly released to 0.003Mpa within 4 seconds at a depressurization rate of 3MPa / s. Then, the modification medium was removed by evaporation in parallel with heating and vacuum pumping, until the pressure drop in the closed container was 133 Pa, and the crystal-modified ramie fabric was obtained. Compared with the microscopic lattice of the ramie fabric, the microscopic lattice of the crystal-change modified ramie fabric has a pore increase of 17% and a crystallinity decrease of 24%; Compared with permanent ramie fabric, the dye uptake rate is incr...

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
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a crystal change modification method of a ramie fabric. The method comprises the steps of placing the ramie fabric in a sealing container, filling the sealing container with modified media, conducting boosting to the modified pressure, then instantly releasing the pressure, removing the modified media, and obtaining the crystal change modified ramie fabric. According to the technical scheme, the method has the advantages that the modified aim is achieved by changing a crystal structure, the modified fabric overcomes the existing defects, the hole is increased, the degree of crystallinity is reduced, the fabric is soft, and the size stability, the softness, the dyeing performance and the like of the fabric are improved; the method of instantly releasing the pressure is adopted, the modified fabric is expanded to the greatest extent, the fluffy performance and the softness of the fabric are greatly improved, and therefore spinning performance, weaving performance and dyeing performance of the fabric are greatly improved.

Description

technical field [0001] The invention relates to a method for crystal modification of ramie fabric, in particular to a method for crystal modification of ramie fabric by pressurizing a modified medium to a modification pressure and releasing the pressure instantly after maintaining the pressure for a period of time. Background technique [0002] Ramie fabric is woven from ramie yarn with larger Young's modulus among natural yarns. It has the advantages of excellent hygroscopicity, low static electricity, strong warmth retention, corrosion resistance and heat resistance, but it also has defects such as hardness, wrinkling, shrinkage, difficulty in spinning, weaving, and dyeing, resulting in poor wearing performance and not easy to be made into high-end products. The vast majority of textile ramie fabrics are low value-added products. [0003] In order to change the above situation, there are many modification methods, such as physical modification method, chemical modificatio...

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
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): D06B5/22D06B15/00D06M11/61D06M101/06
Inventor 孙以泽孟婥黄双孙志军
Owner DONGHUA UNIV