Collection of sodium hexametaphosphate in textile printing and dyeing, there is always one you need

 After going around, we talked about the use of sodium hexametaphosphate in textile printing and dyeing, because sodium hexametaphosphate is really easy to use. Only with good auxiliaries in textile printing and dyeing can textiles be upgraded to a higher level. Today, let's take a closer look at the large collection of uses of sodium hexametaphosphate in textile printing and dyeing. There is always one you need.


(1) As a water softener, so that dyes and soaps will not precipitate or agglomerate

The pH value of sodium hexametaphosphate is close to neutral, and it can form complexes with calcium ions in hard water to achieve the purpose of soft water. Sodium hexametaphosphate is used as a water softener in dyeing or post-treatment. It can extract calcium ions and magnesium ions from the insoluble calcium soap, magnesium soap, or calcium dye and magnesium dye precipitates that have been generated, so that the precipitate can be dissolved again.


In other words, when sodium hexametaphosphate is introduced into the solution, sodium soap can be regenerated. Even when calcium soap or magnesium soap is formed, the clot of calcium soap or magnesium soap will disappear. In the same way, sodium hexametaphosphate can regenerate dyes.


(2) Prevent sodium alginate from precipitation and precipitation in case of calcium

Sodium alginate slurry is the most suitable slurry for reactive dyes, but care should be taken to prevent sodium alginate from infiltrating the calcium in hard water during manufacture to generate calcium alginate.


Therefore, sodium hexametaphosphate must be added to prevent the formation of calcium alginate. Under normal conditions, a dosage of 5-10 g/l is sufficient. Under special circumstances, it can be increased to 15-20 g/l. It can be added when preparing the printing paste or when preparing the original paste.


(3) As a cooking aid

When nylon hank yarn (polyamide fiber) is scoured with soap and soda ash before dyeing, adding sodium hexametaphosphate (about 0.3% of the weight of the yarn) can prevent soap from being consumed by hard water and improve the scouring effect.


(4) Treatment of recycled water

In the circulating water, due to the addition of sodium hexametaphosphate to reduce the hardness, it is not easy to produce calcium carbonate deposits and avoid blocking the water pipe. The dosage is about two parts per million.


(5) Treatment of boiler water. Sodium hexametaphosphate can also be used to treat hard water in the boiler, which can not only avoid the generation of scale, but also can re-dissolve the generated scale, but the price is higher than that of trisodium phosphate.


(6) Ingredients for synthetic detergents Sodium hexametaphosphate is an important ingredient in synthetic detergents (such as sodium alkyl sulfonate, sodium alkyl benzene sulfonate) because it has good water softening ability and washing aid ability.

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