At present, the dyeing process of polyester fabrics in the printing and dyeing industry still uses the traditional acid dye bath condition dyeing method. By adopting this method, the disadvantages of poor quality, low output and high production cost exist in the production process, and it is increasingly unsuitable for production needs, especially for dyeing polyester fabrics after alkaline processing. The existence of these problems lies in the lack of alkaline dyeing auxiliaries, while sodium hexametaphosphate technical grade is a more widely used dyeing auxiliaries in phosphate products.

Let's look at the advantages of alkaline dyeing auxiliaries:

Alkaline dyeing auxiliaries are used as special dyeing auxiliaries for alkaline dyeing of polyester fabrics, so that the alkaline dyeing method has been popularized. After optimizing alkali-resistant disperse dyes and using special alkali agents, polyester fabrics can be dyed under alkaline conditions, so that the fabrics have bright colors, reduce chromatic aberrations, stains, and other defects, greatly improve product yield, quality, and reduce cost of production.

Look at the use of sodium hexametaphosphate in alkaline dyeing auxiliaries:

The alkaline dyeing auxiliary is composed of three components: powdered sodium carbonate, borax, and sodium hexametaphosphate. The percentages of the three components are sodium carbonate No₂Co₃ 22-26% borax, Na₂B₄O₇10H₂O 20-23% sodium hexametaphosphate (NaPo₃) ₆ 54-55%, and the three components are calculated by weight percentage.

Stir the three components evenly in proportion. It is required that the fineness of the alkaline dyeing auxiliary agent is above 60 mesh. The commercial alkaline dyeing auxiliaries realized by this method are solid, and need to be dissolved in water when used, so that they can chelate and soften the water quality, disperse in the aqueous solution, make the aqueous solution alkaline and stabilize the PH value of the dye solution, etc. performance. Sodium hexametaphosphate is precisely able to chelate metal calcium and magnesium ions in the aqueous solution to achieve the effect of softening and dispersing water.