Analysis on the application of chemical dyes by environmental protection dye manufacturers 1. Select chemical dyes according to fiber properties. Because of their different properties, various fibers need to choose suitable chemical dyes when they are dyed. For example, when cotton fiber is dyed, because its molecular structure contains many hydrophilic hydroxyl groups, it is easy to absorb moisture and expand, can react chemically with reactive groups, and is more alkali-resistant, so you can choose direct, reduction, vulcanization, ice chemistry Dyes and reactive chemical dyes. Polyester is highly hydrophobic and is not resistant to alkali at high temperatures. Under normal circumstances, the above chemical dyes should not be used, but disperse chemical dyes should be selected for dyeing.

2. Select chemical dyes according to the purpose of the dyed material. Because the dyed material is used differently, the fastness requirements of the dyed product are also different. For example, cloth used as window cloth is not often washed, but it is often exposed to sunlight. Therefore, when dyeing, you should choose chemical dyes with higher light fastness. As the dyeing of underwear and light-colored fabrics worn in summer, because it needs to be washed and exposed frequently, chemical dyes with high fastness to washing, light and perspiration should be selected.