The using of sodium tripolyphosphate

Sodium tripolyphosphate is indispensable excellent detergent additives, the majority of the detergent in an amount of 10 to 50%, and its main purpose can be summarized asthe following:

Chelation of metal ions. Daily washing water, in general, caused by hard metal ion containing (mainly Ca2 +, Mg2 +). In the washing process, that will work with soap or detergent active material to form an insoluble salt, so that not only increases the consumption of detergent, and the fabrics washed with unpleasant dark gray. Rev. tripolyphosphate hard metal ion chelating excellent performance, thereby eliminating the adverse effects of these metal ions.

Increase peptization, emulsification and dispersion effect. Dirt often contain bodily secretions (mainly protein and fatty substances), also contain from outside sand, dust, etc. And sodium tripolyphosphate having a swelling of the protein, and play solubilization effect peptization; the fatty substances may play a role in promoting emulsification; dispersion of solid particles in suspension effect there.

Buffer role. STPP has a large alkaline buffer, pH of the washing solution maintained at around 9.4, which is conducive to the removal of acidic soil.

Prevent caking effect. Hygroscopic powdered synthetic detergent, such as stored in high humidity areas, we must occur agglomeration. Caked detergent used is extremely inconvenient. And water to form sodium tripolyphosphate hexahydrate, a dry properties. When a large number of detergent formulations of sodium tripolyphosphate, will be able to play to prevent agglomeration caused by moisture absorption, and keep dry granular synthetic detergent.

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