Analysis of the color fastness of reactive dyes to chlorine

Analysis of the color fastness of reactive dyes to chlorine

In the process of wearing and using textiles and clothing, it is inevitable that washing powder or disinfectant with bleaching effect will be used for cleaning and disinfection. Therefore, international regulations on textile and clothing washing labels, such as ISO 3758, ASTM D5489 and GB/T 8685 All require bleaching. 

At present, bleaching is mainly divided into chlorine bleaching and non-chlorine bleaching, and the bleaching agents used are sodium hypochlorite and hydrogen peroxide aqueous solution respectively. 

The test method of color fastness to chlorine varies greatly according to the end use and use area of the textile. European EN standards, Japanese JIS standards, and Chinese GB/T standards all adopt ISO standards, which are mainly divided into two types: color fastness to chlorinated water and color fastness to chlorine bleaching; the American AATCC standard generally adopts the AATCC TS-001 standard. Spot method for determining bleach symbols in US wash instructions. According to ISO and JIS method standards, after soaking the sample, soak it in a hypochlorite solution for 60 minutes, then wash and dry it.

According to different washing types, the AATCC standard is divided into 4 washing temperatures and 4 drying programs, and for different fabrics, the stirring speed of the washing machine, the washing time, the drying speed, the final drying time, and the outlet air temperature and cooling of the dryer Time has different requirements. The biggest difference between this standard and other methods is that it is aimed at the assessment of color fastness to repeated washing at home, that is, unless there are special requirements, repeated washing is required 5 times. For the color fastness test of reactive dyes to chlorine, 19 common reactive dyes, including light three primary colors, medium three primary colors, dark three primary colors, black and bright colors, were selected to discuss their color fastness to chlorine under different test methods for reference. 

(1) The color fastness of dyes to chlorinated water mainly depends on the molecular structure of the color body. 

(2) The chlorine resistance of the single color will affect the chlorine resistance of the three primary colors. Generally, the chlorine resistance of the single color is good, and the chlorine resistance of the three primary colors is good. 

(3) The color fastness to chlorine of reactive dyes basically increases with the increase of the mass fraction of dyes. 

(4) The practical effect of the fixing agent on the color fastness of reactive dyes to chlorine varies depending on the type of the fixed reactive dye and the variety of the fixing agent. The improvement effect is not obvious, and the highest level can be increased by 1.

We have related dyeing machines, you can refer to

Normal Temperature Lab Textile Garment Dyeing Machine GT-D16

This Textile Garment Dyeing Machine is designed for testing dyeing recipes, including mixing, washing, blanching, fixation, dyeing, and assessing fastness of various fabrics under room temperature conditions. Its test glass features flip vertical movement for uniform dyeing with excellent repeatability. 

High Temperature Lab Sample Dyeing Machine GT-D15

This Lab Sample Dyeing Machine apply for dyeing and washing color fastness testing of dyeing knitted fabric, woven fabric, yarn, cotton, loose fibre, zipper, shoe material and other high-temperature hand sample & middle sample.Its high temperature dyeing machine design for dyeing, chemical, raw material, cloth industry, can simulate actual produce condition exactly, meeting requirement technology effect.

IR Lab Dyeing Machine GT-D22

This IR Lab Dyeing Machine  is oil bath type infrared laboratory dyeing machine, it combine the advantages of traditional glycerol dyeing machine with common infrared dyeing machine together. It’s apply to dyeing and testing the color fastness of the knitted fabric, woven fabric, yarn, cotton, loose fiber, zipper etc. ir dyeing machine was special design for dyeing industry, chemical industry, raw material, cloth which can simulate the production conditions exactly and reach the process effect.

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