a) Silicates are stronger alkalis because of their low (Si O 2 / Na 2 O) ratio. For sodium silicates, this ratio can be changed by optionally adding sodium hydroxide.
The pH value of silicate solutions is relatively high. For example, 2O metasilicate pH for 5H is 30 grams / liter solution 12.8. This alkalinity provides the same advantages over organic soils as sodium carbonate.
Organic substance is faster in terms of hydrolysis rate, (Si O 2 / Na 2 O) is low. Similarly, saponification power will be directly related to the alkalinity of the silicate.
b) When silicates (Si O 2 / Na 2 O) ratio reaches 2, they are widely used due to their maximum detergent power.
The addition of silicates to surfactants, especially soap-type anionic materials, makes it possible to further reduce the surface tension (there is a synergistic effect).
The anti-redeposition potency of sulfonate-type surfactants is enhanced by the presence of silicates and their use as soap substitute is possible.
Silicates have excellent dispersing power enhanced by the presence of phosphates (also called deflocculating force). At higher concentration the effect is reduced. The curve passes through a variable maximum as a function of the other components of the medium.
Silicates are good emulsifying agents. Stable and well dispersed emulsions are obtained.
c) Silicates are also used because of their ability to prevent the attack of sensitive metals (aluminum and its alloys, zinc, tin) by strong alkalis.
Aluminum will undergo little or no corrosion, depending on its ratio (SiO 2 / Na 2 O) in the detergent product. In general, the ratio of products for cleaning aluminum devices should be greater than 1.
d) Interesting detergent properties are partially related to the ease with which silicates are adsorbed to surfaces. Unfortunately, desorption is very difficult and silicate products show white streaks that are difficult to remove during drying if they are rinsed poorly.
Whitish deposits that may occur due to silicate products can be dissolved with EDTA (Ethylene Diamine Tetracetic Acid).
e) Silicates are good buffering agents that ensure that the products containing them always operate at the same pH and thus maintain their hydrolysis power.
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