When printing and dyeing, which of sodium hexametaphosphate or soda ash has better softening effect?
The pretreatment of pure cotton or polyester-cotton fabric is mainly to remove impurities on the cotton fiber, so that the fabric has good printing and dyeing processing performance. The conventional desizing, scouring and bleaching processes are set up for different impurities. Which of the commonly used additives in printing and dyeing, sodium hexametaphosphate or soda ash, has better softening effect? When dyeing artificial cotton with direct dyes, soft water is an important condition to ensure quality, especially for some direct copper salt dyes. When dyeing cotton fabrics, soda ash soft water is often used, but when dyeing viscose fabrics, the desired effect may not be achieved. First, let's take a look at the comparison of sodium hexametaphosphate and soda ash: The pH value of soda ash is higher. Due to the low degree of polymerization of viscose fiber, such as the dyeing temperature is set at the boiling point, it is easy to cause the breakage and hydrolysis ...