Method for dyeing cotton at low temperature by edible pigment

A food coloring and cotton dyeing technology, which is applied in the field of textile dyeing, can solve the problems of difficult degradation of dyeing wastewater, high pH value of dyeing wastewater, and increased difficulty in sewage treatment, so as to improve dyeing rate, color fastness to soaping, The effect of improving color fastness

Pending Publication Date: 2021-08-31

NANTONG UNIVERSITY

7 Cites 3 Cited by

AI-Extracted Technical Summary

Problems solved by technology

However, the dyeing temperature of cotton is generally 90-100 °C, which consumes a lot of energy.

At the same time, it needs to be washed many times after dyeing, and the dyeing wastewater is difficult to degrade

Although the Chinese invention patent 201110240401.0 discloses a cotton dyeing process, the dyeing process is complicated and different amounts of NaOH need to be added in different time periods

Since NaOH is a strong alkali, the pH value of the dye solution during the dyeing process is 12-...

Abstract

The invention provides a method for dyeing cotton at low temperature by using edible pigment. The method comprises the following steps of dissolving the edible pigment and carboxymethyl chitosan in deionized water, adjusting the pH value of a solution to 5-6 by using sodium hydroxide, heating the solution to 50-60 DEG C, adding laccase, and uniformly stirring to obtain a cotton dyeing solution with the dyeing bath ratio of (30: 1)-(10: 1); and adding cotton, reacting for 4-5 hours, washing and drying the cotton, and thus obtaining the edible pigment enzymatic dyed cotton. Compared with a traditional dyeing process, the method has the advantages that the use of chemical auxiliaries is reduced, environment-friendly auxiliaries are used, the cost is reduced, the dyeing temperature is 50-60 DEG C, and the energy loss is greatly reduced. The edible pigment used in the invention is natural edible pigment, such as tea polyphenol extracted from tea leaves, or synthetic edible pigment, such as carmine, brilliant blue and lemon yellow. The used edible pigment is green, safe, harmless, energy-saving and environment-friendly.

Application Domain

Dyeing process

Technology Topic

Food coloringChemistry +7

Examples

Experimental program(4)
Effect test(1)

Example Embodiment

[0023] Example 1:

[0024] 0.03 g of a carboxymethyl chitin of 0.03 g of a purity of 98% of tea polyphenol and 0.02 g of a substitution of 0.8 was dissolved in 25 ml of deionized water and the solution pH of 5 was adjusted with sodium hydroxide, and the solution was warmed to 55 ° C. To add 0.20 g of laccase (from the pyridiariosis, the enzyme is 0.1 U / mg) and stir evenly, then add 1G bleached cotton fabric (surface density 175.4 g / m) 2 ), Reaction 4h. After the reaction, the tea polyphenol stained cotton was washed 5 min in warm water at 55 ° C, followed by washing at 19 ° C water. Finally, 15 min was dried at 95 ° C.

Example Embodiment

[0025] Example 2:

[0026] 0.05 g of Carmine red and 0.02 g of a 0.02 g of a 0.02 g of a carboxymethyl chitin were dissolved in 25 ml deionized water and the solution pH of 5.5 was adjusted with sodium hydroxide, and then 0.20 g of laccase was added to 60 ° C. (From the branch of Zhu Hongbin, enzyme is 0.1 U / mg) and stir evenly, then add 1G bleached cotton fabric (surface density 175.4g / m) 2 ), Reaction 4h. After the reaction, the tea polyphenol stained cotton was washed 5 min in warm water at 55 ° C, followed by washing at 19 ° C water. Finally, 15 min was dried at 95 ° C.

Example Embodiment

[0027] Example 3:

[0028] 0.05 g of a carboxymethyl chitin of 0.05 g of lemon yellow and 0.7 is 0.7 is dissolved in 25 ml deionized water and the solution pH of 6 is adjusted with sodium hydroxide. After the solution is warmed to 50 ° C, 0.20g laccase is added. (From the pyridiariosis, enzyme is 10U / mg) and stir evenly, then add 1G bleached cotton fabric (surface density 175.4 g / m) 2 ), Reaction 4h. After the reaction, the tea polyphenol stained cotton was washed 5 min in warm water at 55 ° C, followed by washing at 19 ° C water. Finally, 15 min was dried at 95 ° C.

PUM

Property	Measurement	Unit
Areal density	175.4	g/m²

Description & Claims & Application Information

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Classification and recommendation of technical efficacy words

reduce energy consumption
low cost

Method for dyeing cotton at low temperature by edible pigment

AI-Extracted Technical Summary

Problems solved by technology

Abstract

Examples

Example Embodiment

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

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