Sodium tripolyphosphate is indispensable excellent detergent additives, the majority of the detergent in an amount of 10 to 50%. Its main role can be summarized as the following.
① chelation of metal ions: daily wash water, usually caused by hard-containing metal ions (mainly Ca2 +, Mg2 +). In the washing process, they form insoluble salts with the soap or detergent active, so that not only the increase in the consumption of detergent and fabric make an unpleasant washed dark gray. Sodium tripolyphosphate having a metal ion chelate of hardness excellent performance, which can eliminate the adverse effects of these metal ions.
② improve peptization, emulsification and dispersion effects: dirt often contain human secretions (mainly protein and fatty substances), also contains from outside sand, dust, etc. The protein with sodium tripolyphosphate swelling, solubilization and play peptization effect; fatty substances may play a role in promoting emulsification; dispersed solid particles suspended role there.
③ buffer: sodium tripolyphosphate having a large alkaline buffer, pH value of the washing solution was kept at about 9.4, thereby facilitating the removal of acidic soils.
④ prevent caking effect: hygroscopic powder synthetic detergent, such as moisture stored in larger places, would occur agglomeration. When caked detergent is very inconvenient to use. After the sodium tripolyphosphate hexahydrate absorbent formed with dry properties. When there are a lot of detergent formulations STPP when you can play to prevent caking phenomenon caused due to moisture absorption, keep dry granular synthetic detergent.
