Colour fastness to soap washing of textile fabrics

Colour fastness to soap washing of textile fabrics

Many people misunderstand or do not understand "the color fastness to soap washing of textile fabrics". Lets explore the knowledge of "the color fastness to soap washing of textile fabrics".

1. Comparison of test methods for color fastness to soap washing

Soaping color fastness is one of the more common color fastness evaluation items.Soaping fastness refers to the degree of fading of colored fabric after soaping under specified conditions, which includes the original color fading and white cloth color staining.

The original color fading refers to the fading of colored fabric before and after soaping;White cloth staining is the white cloth and colored fabric in a certain way sewed together, after soaping, because of the color of the fabric faded and the white cloth stained.The degree of discoloration or staining should be tested under the specified light source and rated with standard grey card. The results are classified 5 levels, with 5 being good and 1 being poor.

2. Relationship between dye structure, dyeing and post-treatment process and color fastness of soaping

A significant number of textiles, including cotton, wool, polyester, nylon and their blends, and spandex elastic fabrics, are routinely tested with grades 3 or below for nylon and acetate linings.

Although different fiber materials use different dyes and printing and dyeing processing technology, but the problems are quite similar.This is mainly related to the floating color of cloth and the transfer of some colored fiber particles, so it is also related to the dye varieties, dyeing process and post-treatment process used.

3, reactive dye dyeing product soaping color fastness depends on the unfixed dye

Taking reactive dyes as an example, theoretically speaking, due to the covalent bond between dyes and fibers, washing cannot easily cause dye desorption, fading and osmotic color. Therefore, the color fastness of reactive dyes dyeing products depends on the amount of unfixed dyes (hydrolyzed dyes and a small amount of unreactive dyes).If the removal of hydrolyzed dyes by soaping is not enough, the subsequent washing will continue to fade.The soaps fastness is also related to the bonding stability of the bonded dyes.

Therefore, the factors affecting the color fastness to soaping are the structure and performance of dyes, followed by dyeing and dyeing processes.Reactive dye solid rate is high, or the hydrolysis rate is slow, the amount of hydrolysis dye is small, the amount of dye to be washed and removed is also small.Unfixed dyes and hydrolytic dyes have low directness, good water solubility, not easy to stain and easy to wash and remove.And dye concentration is high, the amount of residual dye, it is not easy to wash away.

4. Soaping fastness is also closely related to dyeing process

In addition, soaping fastness is also closely related to dyeing process.Dye adsorption and diffusion, solid color rate is high, less residual and hydrolysis dyes, easy to wash away.The dyeing process is reasonable, the covalent bond between dye and fiber is not easy to break during dyeing and post-treatment, and the color fastness of soaping is good.

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