Comparison of phosphate and phosphate-free detergent additives

　　For several years, sodium tripolyphosphate happen to be an fundamental detergent additive while in the area of artificial detergent. it may increase the washing efficiency of surfactants, dispersion, emulsification, dirt compatibilization, chelation of very difficult lime scale and magnesium ions, and create soluble sophisticated substance to stop dirt redeposition, buffer alkalinity to increase the rewashing function.

　　At the identical time, phosphorus also contributes to drinking water eutrophication, the proliferation of algae and phytoplankton and sea red-colored tide. it really is the culprit accountable for drinking watertop quality deterioration of rivers and lakes.

　　The shortcomings of phosphorus-containing detergent make consumers even more inclined to non-phosphorus detergent. you can get several non-phosphorus detergent additives, 4A zeolite, sodium metasilicate, crystalline layered sodium disilicate and modified sodium disilicate (MDS), etc.

　　Property comparisons of those additives are as follows:

　　① softened drinking water property：

　　name MDS STPP sodium metasilicate 4A zeolite

　　35℃ 20min CaCO3 mg/g(product) 352.93 347.60 164 301.40

　　35℃ 20min MgCO3 mg/g(product) 402.50 251.30 210 77

　　②water solubility：

　　name MDS Sodium metasilicate layered disilicate 4Azeolite STPP

　　20℃ solubility ≥80 50 insoluble insoluble 17

　　③decontamination index：

　　name MDS STPP 4A zeolite Standard powder

　　Decontamination index 1.46 1.50 1.31 1.00

　　Comparing these parameters above, it is apparent that MDS is even more spectacular versus the other phosphorus-free additives. Therefore, MDS can be a new detergent additive in detergent industry.