A kind of compound crystal change modification method of cotton yarn

A cotton yarn and composite crystal technology, which is applied in the field of cotton yarn composite crystal modification, can solve problems such as difficult removal, insignificant crystallinity reduction, and yarn erosion, and achieves improved dimensional stability, excellent softness, and no The effect of dielectric 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. Uniformity, 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 yarn has a certain effect on cotton yarn, 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

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 yarn. 5 cotton yarns are placed in an airtight container, filled with liquid ammonia, and pressurized at a constant speed of 0.1 MPa / min to a modified pressure of 0.5 MPa. Press for 1min, and then release it to 0.005Mpa within 5 seconds at a depressurization rate of 0.3MPa / s. Finally, the modified medium in the cotton yarn is removed by high-speed centrifugal spin dehydration, microwave heating and vacuum vacuuming parallel evaporation method, that is, the composite crystal modification modified cotton yarn is obtained. 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 modification kettle heated by microwave is 1kW; the vacuum is pumped to negative pressure and below. Compared with the microscopic lattice of the cotton yarn, the microscopic lattice of the composite crystal modification modified...

Embodiment 2

[0028]A method for compound crystal modification modification of cotton yarn. 32 counts of cotton yarn are placed in an airtight container, filled with liquid ammonia, and pressurized at a constant speed of 0.1 MPa / min to a modified pressure of 0.8 MPa. Press for 5 minutes, and then release it to 0.008Mpa within 4 seconds at a depressurization rate of 0.3MPa / s. Finally, the modified medium in the cotton yarn is removed by high-speed centrifugal spin dehydration, microwave heating and vacuum vacuuming parallel evaporation method, that is, the composite crystal modification modified cotton yarn is obtained. Among them, the high-speed centrifugal rotation speed reaches 120rpm, the rotation time can reach 10min, and the radial draft reaches 2mm; the power of a single modification kettle heated by microwave is 5kW; the vacuum is pumped to negative pressure and below. Compared with the microscopic lattice of the cotton yarn, the microscopic lattice of the composite crystal modificat...

Embodiment 3

[0030] A method for compound crystal modification modification of cotton yarn. Put 80 counts of cotton yarn in an airtight container, fill it with liquid ammonia, pressurize at a constant speed of 0.1MPa / min to a modified pressure of 1Mpa, and hold the pressure 5min, and then instantly release to 0.005Mpa within 4 seconds at a depressurization rate of 0.4MPa / s. Finally, the modified medium in the cotton yarn is removed by high-speed centrifugal spin dehydration, microwave heating and vacuum vacuuming parallel evaporation method, that is, the composite crystal modification modified cotton yarn is obtained. 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 modification kettle heated by microwave is 10kW; the vacuum is pumped to negative pressure and below. Compared with the microscopic lattice of the cotton yarn, the microscopic lattice of the composite crystal modifi...

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 yarn. According to the method, the cotton yarn is placed in a closed container, a modification medium is added into the container, 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 yarn can be obtained. According to the crystal change and modified cotton yarn, pores are increased, degree of crystallinity is reduced, the yarn is soft, and therefore 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 yarn are improved greatly; the combined effect of vacuumization, high-speed centrifugal rotation and drafting and microwave is adopted, therefore, yarn quality is further improved, and modification efficiency is greatly improved.

Description

technical field [0001] The invention relates to a compound crystal modification modification method of cotton yarn, specifically a modification method by boosting the modification medium to the modification pressure, maintaining the pressure for a period of time, and then releasing the pressure instantaneously, and then adopting vacuum pumping and high-speed centrifugation Cotton yarn complex crystal transformation modification method with rotary drafting and microwave combined action and removal of modifying medium. Background technique [0002] Cotton yarn is slender and soft, has good hygroscopicity, strong alkali resistance, organic solvent resistance, bleach resistance and heat insulation and heat resistance. It is the largest natural yarn. 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 ...

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): D06B5/16D06B15/00D06M11/61D06M101/06
Inventor 孟婥黄双孙以泽徐洋
Owner DONGHUA UNIV
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