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Method for increasing deep color stability of hemp cloth

A technology for fabric dyeing and color fastness, applied in textiles and papermaking, biochemical fiber treatment, fiber treatment, etc. The effect of color improvement, bright color and high color fastness

Inactive Publication Date: 2008-01-16
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the structure of hemp fiber itself and its supramolecular structure are quite different from those of cotton fiber. The main manifestations are that the colloids in the hemp fiber such as lignin are difficult to remove, and the crystallinity of the hemp fiber is higher, so that the hemp fabric has a darker dyeing property. Poor, low color fixation rate, poor dyeing vividness
These shortcomings seriously restrict the production of hemp fabrics, and the added value of exports is not high
People use processes such as denaturation to treat hemp fabrics. After dyeing, the hand feeling is poor, and the color fixation rate is not improved much.

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

[0015] (1) Take 200g hemp fabric, add water at 1:10 according to bath ratio (ratio of hemp fabric weight to aqueous solution volume, the same below), add 2g L -1 sodium hydroxide, then heated to 50°C, washed for 60 minutes, and then washed with tap water;

[0016] (2) Place the washed hemp fabric in the enzymolysis tank, add pectinase with a concentration of 8g / L, control the pH value to 6.5, the temperature is 60°C, the bath ratio is 1:10, and the treatment is performed for 1.5 hours. Take out, wash with water and dry;

[0017] (3) Dye the hemp fabric after enzyme treatment after washing and drying. The dyeing formula is: reactive red X-3B dye concentration 4% (dye concentration is relative to the hemp fabric weight), pH is 6, and temperature is 110°C , the pressure is 0.3MPa, the liquor ratio is 1:10, the dyeing accelerator NaNO 3 The concentration is 10g / L, the concentration of the dyeing accelerator NaCl is 20g / L, the concentration of the leveling agent NaCl is 30g / L, an...

Embodiment 2

[0019] (1) Take 200g of hemp fabric, add water at a liquor ratio of 1:8, and add 4g·L -1 Sodium hydroxide, then heated to 40 ° C, washed for 50 minutes, and then washed with tap water;

[0020] (2) Place the washed hemp fabric in the enzymolysis tank, add pectinase with a concentration of 10g / L, control the pH value to 8.5, the temperature is 50°C, and the bath ratio is 1:15, and treat for 2 hours. Take out, wash with water and dry;

[0021] (3) Dye the hemp fabric after the enzyme treatment after washing and drying. The dyeing formula is: reactive yellow X-R dye concentration 3% (the dye concentration is relative to the hemp fabric weight), the pH is 4, the temperature is 130° C., and the pressure 0.5MPa, liquor ratio 1:15, concentration of dyeing accelerator NaCl 20g / L, leveling agent NaCl concentration 40g / L, heating rate 3°C / min, after rising to the specified temperature, keep warm for 30min After the heat preservation is over, cool down to 65°C at a rate of 1°C / min, dis...

Embodiment 3

[0023] (1) Take 200g of hemp fabric, add water at a liquor ratio of 1:9, and add 3g·L -1 Sodium hydroxide, then heated to 45 ° C, washed for 55 minutes, and then washed with tap water;

[0024] (2) Place the washed hemp fabric in the enzymolysis tank, add pectinase with a concentration of 9g / L, control the pH value to 7, the temperature is 40°C, the bath ratio is 1:13, and the treatment is 1.7 hours. Take out, wash with water and dry;

[0025] (3) Dye the hemp fabric after the enzyme treatment after washing and drying. The dyeing formula is: reactive black KN-B dye concentration 3.5% (the dye concentration is relative to the hemp fabric weight), pH is 3, and the temperature is 120°C , the pressure is 0.4MPa, the liquor ratio is 1:12, the dyeing accelerator Na 2 SO 4 The concentration is 15g / L, the concentration of dyeing accelerator NaCl is 10g / L, the concentration of leveling agent NaCl is 35g / L, and the heating rate is 2°C / min. After rising to the specified temperature, k...

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 discloses a method for increasing the color fastness of dark dye of hemp fabrics. Firstly, the hemp fabrics are washed with sodium hydroxide prior to dyeing; then the washed hemp fabrics are treated with pectinase in an enzymolysis tank and sequentially dyed; the dyeing liquid is removed and the dyed fabrics are washed with a mixture of water and soaping agent until the washing liquid is clear; and finally the fabrics are dehydrated and dried. In this invention, the hemp fabrics are treated with pectinase prior to high-temperature high-pressure dyeing, so as to appropriately reduce the crystallization degree of hemp fabrics while further dissolving colloid substances, thereby facilitating the attachment of dye to the hemp fabric. Simultaneously the fibers are loosened after the treatment with pectinase, so that the dyed hemp fabrics have bright color, soft hand touch and high color fastness. The hemp fabrics dyed by this method is superior in that the color fastness to soaping reaches 4-5 levels and the color fastness to rubbing reaches 4 level.

Description

technical field [0001] The invention relates to a fabric dyeing method, in particular to a method for improving the dark color fastness of hemp fabric. Background technique [0002] Hemp fiber is one of the earliest natural textile fibers utilized by humans. But because tetrahydrocannabinol (THC) contained in cannabis can produce stimulants and drugs, cannabis planting was prohibited in the world as early as 1937, causing the research and development of hemp fiber to be basically at a standstill. Since Britain developed low-toxic cannabis (THC<0.3%) in 1992, Western countries have lifted the ban on cannabis cultivation. Because hemp fiber fabric has excellent properties such as no itching, friction resistance, antibacterial, antibacterial health care, mildew resistance and excellent anti-ultraviolet radiation, and no need for fertilization and spraying drugs in hemp cultivation, so hemp fiber is also known as As "the functional green fiber of the 21st century", so hemp,...

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 Applications(China)
IPC IPC(8): D06P1/44D06P3/66D06M16/00
Inventor 冯新星陈建勇朱海霖张建春郭玉海张华鹏
Owner ZHEJIANG SCI-TECH UNIV
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