What is the difference between silica sol VS water glass

What is the difference between Silica Sol VS Water Glass?

Many people think of water glass and silica sol when saying the adhesive. These is the 2 adhesives widely used in precision casting. So what is the difference between silica sol and water glass? Now let&#;s learn it together.

If you want to learn more, please visit our website Hebei Silicon Research Electronic Materials Co., L.

Silica sol characteristics

Silica sol is a dispersion of nano-sized silica particles in water or in a solvent. It is a colloidal solution, odorless and non-toxic. Since SiO2 in the silica sol contains a large amount of water and hydroxyl groups, the molecular formula of the silica sol is SiO2.nH2O.

Water glass characteristics

The water glass is in the state of sodium silicate solution. Also known as saponin. An aqueous solution of sodium silicate is commonly known as water glass. Sodium silicate is a colorless, slightly colored transparent or translucent viscous liquid in a system in which water is used as a dispersing agent. Solid sodium silicate is a colorless, slightly colored transparent or translucent glass block. The form is divided into liquid, solid, and water quenching. In theory, these substances are called &#;colloids.&#;

How to distinguish between silica sol VS water glass

1&#;&#;The characteristics of the two are different, as above.

2&#;&#; Different uses.

The main uses of silica sol are as follows:

1. Used as a binder for various refractory materials, featuring strong adhesion and high-temperature resistance ( ° C &#; ° C).

2. It is used in the coating industry to make the coating firm, and it can resist dirt, dust, aging, fire, and other functions.

3. For thin shell precision casting, it can make the shell type strong and the casting smoothness is high. It is better in shape than water glass. Instead of silicate molding, it reduces costs and improves operating conditions.

4. Silica sol has a high specific surface area. It can be used in catalyst manufacturing and catalyst carriers.

5. Used in the paper industry. It can be used as a cellophane release agent, a photographic paper pretreatment agent, a cement bag anti-slip agent, and the like.

6. Used as a sizing agent for the textile industry. It is used together with oil to treat the spinnability of wool and rabbit hair, reduce breakage, prevent flying flowers, improve yield and increase economic benefits.

7. Used as a silicon steel sheet treatment agent, a picture tube dispersant, a floor wax anti-slip, and the like.

The use of water glass is as follows: in chemical production.

1. It is used to make silica gel, white carbon black, zeolite molecular sieve, sodium metasilicate pentahydrate, silica sol, layered silicon, instant powdered sodium silicate, sodium potassium silicate, etc. Silicate products. It is the basic raw material of silicon compounds.

2. In the light industry, it is an indispensable raw material in detergents such as washing powder and soap. It is also a water softener and a preservative.

3. Used in the textile industry for dyeing, bleaching, and sizing

4. Widely used in the machinery industry for casting, grinding wheel manufacturing and metal preservatives, etc.

5. Used in the construction industry to manufacture quick-drying cement, acid-resistant cement waterproof oil, soil curing agent, refractory materials, etc.

6. Silicon fertilizer can be produced in agriculture

In addition, it is used as a silicon-aluminum catalyst for catalytic cracking of petroleum, a filler for soap, an adhesive for corrugated paper, a metal preservative, a water softener, a detergent builder, a refractory material and a ceramic raw material.

JC Casting is a Silica Sol investment Casting and Water Glass Casting manufacturer in China. Contact us here for more information about JC Casting, obtain a quote, or to discuss your water glass project requirements in more detail. Alternatively, please get in touch using the details below.

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Suspensions of fine amorphous silica particles in a liquid

If you want to learn more, please visit our website hydrophilic silica.

Colloidal silicas are suspensions of fine amorphous, nonporous, and typically spherical silica particles in a liquid phase. It may be produced by Stöber process from Tetraethyl orthosilicate (TEOS).

Properties

Usually they are suspended in an aqueous phase that is stabilized electrostatically. Colloidal silicas exhibit particle densities in the range of 2.1 to 2.3 g/cm3.

Most colloidal silicas are prepared as monodisperse suspensions with particle sizes ranging from approximately 30 to 100 nm in diameter. Polydisperse suspensions can also be synthesized and have roughly the same limits in particle size. Smaller particles are difficult to stabilize while particles much greater than 150 nanometers are subject to sedimentation.

Manufacture

Colloidal silicas are most often prepared in a multi-step process where an alkali-silicate solution is partially neutralized, leading to the formation of silica nuclei. The subunits of colloidal silica particles are typically in the range of 1 to 5 nm. Whether or not these subunits are joined depends on the conditions of polymerization. Initial acidification of a water-glass (sodium silicate) solution yields Si(OH)4.

If the pH is reduced below 7 or if salt is added, then the units tend to fuse together in chains. These products are often called silica gels. If the pH is kept slightly on the alkaline side of neutral, then the subunits stay separated, and they gradually grow. These products are often called precipitated silica or silica sols. Hydrogen ions from the surface of colloidal silica tend to dissociate in aqueous solution, yielding a high negative charge. Substitution of some of the Si atoms by Al is known increase the negative colloidal charge, especially when it is evaluated at pH below the neutral point. Because of the very small size, the surface area of colloidal silica is very high.

The colloidal suspension is stabilized by pH adjustment and then concentrated, usually by evaporation. The maximum concentration obtainable depends on the on particle size. For example, 50 nm particles can be concentrated to greater than 50 wt% solids while 10 nm particles can only be concentrated to approximately 30 wt% solids before the suspension becomes too unstable.

Applications

See also

References