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Application scope of pentahydrate sodium silicate, nonahydra

Sodium metasilicate is an inorganic substance with the chemical formula Na2SiO3, which is a white granular crystal. It is a low molecular weight crystal obtained by the hydrothermal reaction of ordinary foaming alkali and caustic soda. The products include anhydrous, pentahydrate, and nonahydrate, among which nonahydrate only exists in the Chinese market.
 

Application scope of sodium metasilicate pentahydrate

Among the varieties of sodium metasilicate, the most commonly used and typical is pentahydrate sodium metasilicate, whose crystal formula is usually written as Na2SiO3 · 5H2O. In fact, it is a tetrahydrate of sodium dihydrogen orthosilicate with two cations, with a solubility of 50g/100g water at 20 ℃ and a melting point of 72 ℃. Five water sodium metasilicate has the general characteristics of sodium silicate and sodium metasilicate, and has a certain ability to bind calcium and magnesium ions, especially with a binding capacity for magnesium ions greater than 260mgMgCO3/g (35 ℃, 20min).
 

1. Washing aids

Sodium metasilicate is easy to mix with other commonly used diluents such as soda ash, phosphate, sodium humate, etc. to form a suitable dilution and gelatinization agent, which has better gelatinization performance than a single gelatinization agent. Sodium metasilicate pentahydrate has strong wetting, emulsifying, and saponification effects on fatty substances, and has strong degreasing properties. It is widely used in the preparation of various detergents and is the best substitute for sodium tripolyphosphate.
 

2. Metal surface treatment

Silicates undergo hydrolysis in water, and the resulting silicic acid is insoluble in water. Instead, it is suspended in a micelle structure in the tank solution. This solvated micelle has the ability to suspend and disperse solid dirt particles, and has an emulsifying effect on oil stains, which is beneficial for preventing dirt from re depositing on the surface of the workpiece. Silicates have a buffering effect, meaning that their pH value remains almost unchanged in the presence of acidic dirt.
 
Silicates can also form precipitates with high valence metal ions in water, remove iron salts from water, and chelate calcium and magnesium ions, which can be said to have a softening effect on water in a certain sense. Silicates also have corrosion resistance and are metal corrosion inhibitors, so alkaline cleaning agents used for non-ferrous metals, especially aluminum, zinc, tin and other components, almost all contain silicates.
 

3. Ceramic grinding aids

The reason why sodium metasilicate has a diluting effect is that it can increase the surface charge density of the micelles in the mud, thereby increasing the double layer and zeta potential, and increasing the repulsive force between particles; At the same time, the silicate anions contained in sodium metasilicate can form insoluble substances with harmful ions such as Ca2+and Mg2+in the mud, promoting the exchange of Na+and reducing the viscosity of the mud while increasing its fluidity. Specially suitable as an additive for ceramic slurry injection molding.
 

4. Refractory raw materials, de ink raw materials, and plastic and water retaining agents.

 

Application scope of nine water sodium metasilicate

The molecular formula of sodium metasilicate is Na2SiO3 · 9H2O. The crystal water content reaches 58%, and the solubility (20 ℃) is 38g/100g water, but the dissolution rate is relatively fast; The melting point is 41.6 ℃, and at 30-40 ℃, crystal water will be released, causing inconvenience to use; During storage, the phenomenon of self dissolution and solidification is quite severe. In many industries such as ceramics that do not require crystal water, the amount of sodium metasilicate used is not small, and the market is relatively stable, with an annual demand of 70000 to 100000 tons.
 
1. It is mainly used as an adhesive for paper, wood, welding rods, casting, refractory materials, and as a filling material in the soap industry, as well as a soil stabilizer and rubber waterproofing agent. Also used for paper bleaching, mineral flotation, and synthetic detergents. It is a component of inorganic coatings and a raw material for a series of products such as silicone, molecular sieves, and precipitated white carbon black.
 
2. Used as an analytical reagent, fabric fireproof agent, adhesive, hardener, weighting agent, and filler. Also used for ore flotation and petroleum refining.
 
3. The adhesive industry uses adhesives for corrugated paper, cardboard, plywood, wood, packaging materials, refractory materials, and building materials. Used in the chemical industry to manufacture silicates, silica gel, silica sol, molecular sieves, white carbon black, and silicon aluminum catalysts. The foundry industry is used for manufacturing grinding wheels and sanding. The textile industry is used for bleaching, dyeing, and sizing of textiles, as well as as as a cooking aid for cotton fabrics and a stabilizer for hydrogen peroxide bleaching. The detergent industry extensively uses heavy scale detergents, which can form precipitates with heavy metal ions, soften water, prevent dirt from re depositing on clothing, and also have corrosion inhibition, wetting, and emulsifying properties; It is also specially used as a hard surface washing aid. It can also be used as a soil stabilizer, rubber waterproofing agent, paper bleaching agent, cutting coolant rust inhibitor, soap filler, metal preservative, etc. It is also used in mineral flotation, refractory and ceramic production, food preservation, etc.
 
4. It can be used for fire prevention of wood, extending the storage period of poultry eggs, and as an efficient detergent and water softener. Used as an anti-corrosion agent for aluminum tubes in toothpaste.
 

Application range of anhydrous sodium metasilicate

Anhydrous sodium metasilicate is a salt of silicic acid, belonging to inorganic salt products, with the molecular formula Na2SiO3 · nH2O. It is a non-toxic, odorless, and pollution-free white powder or crystalline particle. Easy to dissolve in water and dilute alkali solution, insoluble in alcohol and acid. The aqueous solution is alkaline.
 

1. Washing powder detergent.

ISS and 4A zeolite have complementary functions, and when mixed in a reasonable ratio, they can completely replace STPP in laundry detergent. It can not only produce ordinary laundry powder by spray drying as the pre ingredient, but also produce concentrated laundry powder by agglomeration as the base powder. The product has good liquidity, no agglomeration, no caking, and strong decontamination power.
 

2. Laundry cream and laundry detergent additives.

Good compatibility with surfactants and bleaching agents, no hydrolysis, no precipitation.
 

3. Dishwashing detergent.

The oil absorption value is as high as 70%, and its ability to remove oil stains replaces that of hydrated sodium silicate (oil absorption value of 38%).
 

4. Industrial cleaning agents and additives.

ISS is an important component of various cleaning agents such as metal cleaning agents, heavy oil cleaning agents, oil pipeline dredging cleaning agents, and bottle and bottle cleaning agents. It has strong cleaning power and anti-corrosion and rust prevention effects.
 

5. Clean the oil stains directly.

ISS can be directly mixed into an appropriate concentration of aqueous solution without the need for surfactants to clean oil stains.
 

6. Ceramics, cement, refractory materials, and grinding aids.

ISS has a unique effect of reducing coagulation and depolymerization, which can effectively shorten the fine grinding time, improve the strength of the embryo and cement grade in the production of ceramics, cement, and refractory materials.
 

7. Cement additives and dispersants for construction.

 

8. Electroplating rust removal and polishing agent, pH buffering agent.

 

9. Cotton yarn steaming, paper bleaching, fabric finishing agent.

 

10. Used as adhesives and cement dispersants in crude oil, natural gas, and underwater drilling projects.

 

11. Metal anti-corrosion and rust inhibitor.

 

12. Blast furnace maintenance and masonry adhesive.

 

13. Production of additives for special lubricants and thixotropes.

 

14. Glass reinforcement agent.

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