Sodium Silicate

Sodium silicate  is an inorganic compound with the chemical formula Na2O·nSiO2. Its aqueous solution is commonly known as water glass and serves as a mineral binder. It is a soluble inorganic silicate with a wide range of applications

Sodium silicate is the most valuable filler in the soap-making industry. Incorporating sodium silicate into laundry soap can buffer its alkalinity, reduce its loss in water, enhance cleaning power, and prevent soap rancidity.

The modulus in sodium silicate is defined as: n=SiO2/Na2O (molar ratio), which indicates the composition of sodium silicate and serves as a key parameter, typically ranging between 1.5 and 3.5.

The higher the modulus of sodium silicate, the more difficult it is to dissolve in water. When n is 1, it can dissolve in room-temperature water, but as n increases, hot water is required for dissolution. When n exceeds 3, steam at more than 4 atmospheres of pressure is necessary for dissolution. A higher modulus of sodium silicate corresponds to a greater Si content, which increases the viscosity and promotes decomposition and hardening. Additionally, the bonding strength improves. Moreover, sodium silicates with different moduli exhibit varying degrees of polymerization, leading to significant differences in the silicate components of their hydrolysis products that are crucial for production applications. Consequently, sodium silicates with different moduli have distinct uses.

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