SMSIL Technology

In daily chemical industry, with the development of detergent products without phosphate, Sodium metasilicate as active high alkalinity and PH buffer indices in inorganic electrolytes, has the strong wetting, emulsification, and the effect of saponification oil, in removing dirt, dispersion and suspension has excellent performance, and can prevent dirt deposit again, is generalized phosphating developing a substitute for STPP is the most effective first, widely used in a variety of phosphorus-free daily chemical products, with strong oil performance.
1. Environmentally friendly and phosphorus-free, it is the most effective substitute for sodium tripolyphosphate
2. Stronger ability to remove/disperse/suspend dirt.
3. Strong alkalinity and cost reduction
Action of sodium metasilicate pentahydrate
1.1.1； Buffering effect
The main components in the oil stain are oil and fatty acids, which are saponified under the action of alkali. The oil stain changes from water-insoluble matter to water-soluble matter, so it is washed away by water. Sodium metasilicate has a stronger pH buffer than other reducing substances, and in the process of neutralizing acidic dirt, oil stain, and oil emulsification, the pH value changes less with the change of alkalinity, acidity, or concentration in its solution. This feature makes the of Meta silicic acid play a great role in the washing process and make it more widely used.
Among inorganic electrolytes, sodium metasilicate has the highest silver impact index, so it plays a great role in decontamination and cleaning.
1.1.2 washing effect
Washing is the process of cleaning dirt from its attached surface. Therefore, the nature of the cleaning agent has a great impact on the decontamination effect. Sodium metasilicate has the best ratio of alkaline and soluble SiO: that best meets the requirements of the cleaning agent. It can disperse grease and dirt into small, suspended particles and rinse it off. No longer deposited on the surface of the washed object.
Sodium metasilicate can promote the decontamination of non-ionic detergent. The effect of sodium metasilicate with the same molar content is close to STPP (Penta sodium).
1.1.3 anti-corrosion effect
The anti-corrosion performance of sodium metasilicate directly comes from soluble SiO components. In the washing process, when used with highly corrosive substances, it will provide anti-corrosion effect, which can reduce the corrosion of phosphate, other substances, and surfactants to the washed substances, especially tin, aluminum, copper, and soft metal alloys.
1.2 application of sodium Penta narcissus silicate in detergent.
1.2.1 application in type 1 washing powder
Design a basic formula (see Formula 1 in Table 3), then reduce the content of STPP respectively and replace it with Meta silicic acid pentahydrate. The formula composition and decontamination power are shown in Table 1.

It can be seen from the test that the decontamination value of partially replacing STPP with sodium metasilicate pentahydrate decreases with the increase of substitution amount, but in the above standard formula, even if STPP is reduced to 12%, the decontamination index of the washing powder can meet the national standard.