Why does sodium hexametaphosphate need to be added as an additive in the textile printing and dyeing process?

In textile printing and dyeing, it is well known that soft water is needed, and soft water is one of the important conditions for ensuring quality. There are many auxiliaries for textile printing and dyeing. Sodium hexametaphosphate is used to improve the quality of textile printing and dyeing, thereby increasing the added value of textiles.

Calgon SHMP

Sodium Hexametaphosphate

1.Use as a water softener to prevent fuel and soap from settling and caking.

The pH value of sodium hexametaphosphate is close to neutral, and it can form a complex with calcium ions in hard water to achieve the purpose of softening water. Sodium hexametaphosphate is used as a water softener to form insoluble calcium soap, magnesium soap or magnesium fuel precipitate and redissolve. In other words, introducing sodium hexametaphosphate into the solution can regenerate sodium soap and even formed calcium soap or The clumps of calcium or magnesium soap will also disappear. In the same way, sodium hexametaphosphate can regenerate fuel.

2. Prevent sodium alginate from precipitating when exposed to calcium.

Sodium alginate slurry is the most suitable slurry for active fuel, but care should be taken to prevent sodium alginate from seeping into the calcium in hard water during manufacture to form calcium alginate.

Therefore sodium hexametaphosphate must be added to prevent the formation of calcium alginate. Under normal conditions, the dosage of 5-10 g/L is sufficient. In special circumstances, it can be increased to 1 liter. It can be added when preparing the printing paste or the original paste.

3. As a cooking aid

When scouring nylon skein (polyamide fiber) with soap and soda ash before dyeing, adding sodium hexametaphosphate (about 0.3% of the weight of the skein) can cause the liver to be 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, the hardness is reduced, so calcium carbonate precipitates are less likely to form and blockage of water pipes is avoided. The dosage is about one million parts.

5. Treatment of boiler water

Sodium hexametaphosphate can also be used to treat hard water in the furnace. It can not only avoid the generation of scale, but also dissolve the scale that has been generated, but the price is higher than 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 ability.

Textile printing and dyeing auxiliaries are a development and operation-oriented industry. While vigorously developing new products and new technologies, it also needs to spend more effort to research products and provide comprehensive technical services and technical support. The comprehensive advantages of sodium hexametaphosphate can reduce fixed asset investment, avoid continuous large-scale production, use intermittent production close to the field, and produce on demand to avoid unnecessary losses.

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