Colloidal Silica

Sols

Link to Hebei Silicon Research Electronic Materials Co., L

The term silica sol is derived from silicic acid sol, or more accurately silicic acid aqua sol. Silica sols are colloidal dispersions solutions of silicic acid in water. Chemically speaking, a distinction should be made between colloidal dispersions of high molecular polysilicic acids and amorphous silica particles with particle sizes in the nm range. Insofar as dilute, colloidal silicic acid solutions are formed in chemical reactions, e.g. between an alkali silicate and acid, the solutions involved are often polysilicic acid solutions with a high molecular weight. Even after appropriate purification, they remain unstable and solidify by gelling. They cannot be produced in high concentration of up to approx. 50%. G-SIL products on the other hand are colloidal dispersions of silicon dioxide particles that are immensely stable and resistant to gelling. Depending upon the type, the products can be manufactured to a concentration of 50% and then dispatched in this form. We have decades of experience in the production and application of colloidal dispersions.

G-SIL products are being used in numerous branches of industry as bulk raw materials and as indispensable auxiliaries for special applications. Gujarat Silicon produces a wide range of products with a variety of properties. New product types are continually being developed for new applications.


Products

The G-SIL types are aqueous colloidal dispersions of amorphous silica (SiO2). The silica particles contained in it occur in the form of discrete spheres that are not cross linked with each other and that have been hydroxylated on the surface.

The alkaline types of silica sol are anionic. G-SIL types are produced from molecularly dissolved silicic acid by means of growth processes. They are not produced by re-dispersion of solid, fine, amorphous silica. The presence of crystalline silica components can therefore be ruled out.

The G-SIL types are X-ray amorphous. Stabilization of colloidal particles takes place as the result of charges on the surface of the particles and not, as often is the case with organic polymer dispersions, by way of surfactant substances.

G-SIL is synthesized in an aqueous medium, which consists exclusively of inorganic substances, with no organic solvents being present. Subsequent processing, if necessary using additives, allows further products with specially requested properties to be produced.

The G-SIL types contain colloidal distributed non water-soluble solid silica in an aqueous solution. The key feature of most applications is that the G-SIL types are used as colloidal solutions, and that after use, solid amorphous silica, which is insoluble in water, is left over.


G-SiL - Types

G &#; SiL GSL &#; 30 &#; SL2 Specific Surface Area
Solid Content
Ionicity 200 Sq.m/gm
30 %
Anionic G &#; SiL GSL &#; 30 &#; SL3 Specific Surface Area
Solid Content
Ionicity 300 Sq.m/gm
30 %
Anionic G &#; SiL GSL &#; 30F &#; SL3 Specific Surface Area
Solid Content
Ionicity
Additive 300 Sq.m/gm
30 %
Anionic
Biocide
e.g Formaldehyde G &#; SiL GSL &#; 40 &#; SL Specific Surface Area
Solid Content
Ionicity 200 Sq.m/gm
40 %
Anionic G &#; SiL GSL &#; 30 &#; AM3 Specific Surface Area
Solid Content
Ionicity 200 Sq.m/gm
30 %
Anionic
[ Ammonia Stabilized]

The principal applications of G-SiL SILICA SOL

The Following properties of the G-SiL types are of particular significance to its applications:

» transformation from non-crosslinked sol to specially crosslinked gel form
» finely distributed , colloidal form with G-SiL particles in the nm range
» high degree of purity, and in particular the almost total absence of alkalis and electrolytes
» solidilty , inertness , resistance to heat and temperature change of the dried G-SiL particles of amorphous silica.

The numerous possible uses of G-SiL can be divided up as follows:

Use as a binder
Examples - precision  casting  using  shell process   - production of vacuum-formed products made from inorganic fibers   - production of granules
Use as a surface modifier
Examples - anti slip treatments for linings   - anti-slip paper bags   - anti &#; blocking for films and aqueous coatings
Use in reactions of colloidal chemicals
Examples - fining of beverages   - paper retention   - modification of shortcrete   - binder for catalyst formulation

Examples of application by various types :

Steel & Foundry  sector

Precision casting using
the  Shell Process G-SiL GSL-30-SL3
G-SiL GSL-30-SL2 Coating of grain oriented
Silicon steel plates G-SiL GSL-30-SL2
G-SiL GSL-30-SL3 Refractory Sector Production of Vacuum Formed
Parts from Ceramic Fibre G-SiL GSL-40-SL
G-SiL GSL-30-SL2
G-SiL GSL-30-SL3 Mixing liquid for impression
Materials G-SiL GSL-30-SL2
G-SiL GSL-30-SL3 Coating Systems Adhesion reinforcement ,
Antiblocking and increasing the
Strength of aqueous emulsion paints G-SiL GSL-40-SL
G-SiL GSL-30-SL2
G-SiL GSL-30F-SL2 Construction Sector Additive for shortcrete G-SiL GSL-40-SL Catalyst Material Binders for Catalyst Formulation G-SiL GSL-30-AM3

G-SiL colloidal silica sol for foundry

There are few places where precision, strength, safety and reliability are more important than in a foundry. Colloidal silica is one of the most important products used in foundry operations.

The foundry sector uses more colloidal silica than practically any other industry in the world, and has done for a long time. Colloidal silica's main function at the foundry is as a binder used in:

• Refractory Fiber Bonding (RFB)
• Refractory Cement/ Ceramics
• Precision Investment Casting (PIC)

We have several products that will meet all of your requirements in these areas.

The right stuff
Refractory fiber bonding ( RFB )



Refractory fibers used in high temperature insulation products require a safe and reliable binder. Colloidal silica is used for this purpose. Products made in this way include parts for the steel and glass industries, coal and log fire parts, and insulation rings for radiant heaters. Such products are normally manufactured using a vacuum forming process. There are both organic (colloidal silica plus starch) and inorganic processes. Colloidal silica is ideal for refractory fiber bonding due to its ability to withstand continuous operating temperatures of C with little shrinkage and good resistance to thermal shock.

A vital ingredient
Ceramic



In the refractory cement/ceramics industry Colloidal Silica is used as a binder in the manufacturing of big molded high temperature insulation parts/blocks. They are mainly used in steel, aluminium and gas furnaces. The ability of Colloidal Silica to withstand continuous operating temperatures of C with little shrinkage and good résistance to thermal shock make it indispensable in the ceramics casting process

Perfect results
Investment casting



When it comes to investment casting, only the best materials give great results.

Colloidal Silica is the preferred binder in investment casting. It is used in the building of shells for ceramic molds during the investment casting process. It allows for greater intricacy of design and its high temperature tolerance and chemical inertness make it useful in binding a wide variety of refractory materials and for casting many metals and alloys.

Typical products made this way include turbine blades for aerospace and stationary engines, turbo fans and other parts for the automotive and weapons industries, medical and dental implants/instruments, and parts for household appliances.

Catalyst Material



Gujarat Silicon has various innovative raw material solutions for the catalyst formulator. Our specially developed Colloidal Silica have exclusive benefits and can effectively meet your needs in the following applications:

Colloidal Silica Binders for Spraydried and Extruded Catalysts

• Improved catalyst strength, attrition resistance, and surface area; Gujarat Silicon has a wide range of particle sizes, size distributions, and concentrations.


• Specially developed approach to reducing metal contaminants; Ultra high purity and Ammonia Stabilized Colloidal Silica.
  
  We understand the technical requirements for catalyst formulators and are capable of offering appropriate Colloidal Silica for various formulations.

Silica Based Zeolite

Gujarat Silicon expertise in producing nano particles offer's the formulator with new options to improve manufacturing efficiency and final catalyst performance, including the following benefits:

• Nanoparticle silica promotes more efficient zeolite formation
• Atomic level mixtures of silica and alumina promote efficient crystallization of zeolites
• Ultra high purity levels are available to reduce crystal defects

The Following properties of the G-SiL types are of particular significance to its applications:» transformation from non-crosslinked sol to specially crosslinked gel form» finely distributed , colloidal form with G-SiL particles in the nm range» high degree of purity, and in particular the almost total absence of alkalis and electrolytes» solidilty , inertness , resistance to heat and temperature change of the dried G-SiL particles of amorphous silica.The numerous possible uses ofcan be divided up as follows:There are few places where precision, strength, safety and reliability are more important than in a foundry. Colloidal silica is one of the most important products used in foundry operations.The foundry sector uses more colloidal silica than practically any other industry in the world, and has done for a long time. Colloidal silica's main function at the foundry is as a binder used in:We have several products that will meet all of your requirements in these areas.Refractory fibers used in high temperature insulation products require a safe and reliable binder. Colloidal silica is used for this purpose. Products made in this way include parts for the steel and glass industries, coal and log fire parts, and insulation rings for radiant heaters. Such products are normally manufactured using a vacuum forming process. There are both organic (colloidal silica plus starch) and inorganic processes. Colloidal silica is ideal for refractory fiber bonding due to its ability to withstand continuous operating temperatures of C with little shrinkage and good resistance to thermal shock.In the refractory cement/ceramics industry Colloidal Silica is used as a binder in the manufacturing of big molded high temperature insulation parts/blocks. They are mainly used in steel, aluminium and gas furnaces. The ability of Colloidal Silica to withstand continuous operating temperatures of C with little shrinkage and good résistance to thermal shock make it indispensable in the ceramics casting processWhen it comes to investment casting, only the best materials give great results.Colloidal Silica is the preferred binder in investment casting. It is used in the building of shells for ceramic molds during the investment casting process. It allows for greater intricacy of design and its high temperature tolerance and chemical inertness make it useful in binding a wide variety of refractory materials and for casting many metals and alloys.Typical products made this way include turbine blades for aerospace and stationary engines, turbo fans and other parts for the automotive and weapons industries, medical and dental implants/instruments, and parts for household appliances.Gujarat Silicon has various innovative raw material solutions for the catalyst formulator. Our specially developed Colloidal Silica have exclusive benefits and can effectively meet your needs in the following applications:Gujarat Silicon expertise in producing nano particles offer's the formulator with new options to improve manufacturing efficiency and final catalyst performance, including the following benefits:

Silica-based products are widely used across various industries for their unique properties and applications. Among these, colloidal silica and silica sol are two commonly referenced terms that, despite their similarities, have distinct differences. Understanding these differences can help in choosing the right product for specific applications.

Composition and Structure

Colloidal Silica

Colloidal silica consists of fine particles of amorphous silica dispersed in a liquid, typically water. These particles are spherical, with a typical size range from a few nanometers to several hundred nanometers. The stability of colloidal silica is achieved through the electrostatic repulsion between the particles, preventing them from agglomerating.

Silica Sol

Silica sol, on the other hand, is a type of colloidal silica but is specifically defined by its method of production and particle characteristics. Silica sol is produced through the polymerization of silicic acid, resulting in a stable dispersion of silicate particles in water. The particles in silica sol tend to be more uniform in size and shape compared to general colloidal silica.

Production Methods

Colloidal Silica

The production of colloidal silica typically involves the partial neutralization of sodium silicate with acid. This process leads to the formation of silica particles suspended in water. Various methods can be employed to control the size and distribution of these particles, such as adjusting the pH, temperature, and concentration of reactants.

Silica Sol

Silica sol is manufactured through a more controlled process of polymerization and peptization of silicic acid. The sol-gel process is often used, involving the transition of a solution into a gel, followed by a drying process to achieve a stable dispersion. This method allows for precise control over the particle size and distribution, resulting in a more homogeneous product.

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Applications and Uses

Colloidal Silica

Colloidal silica is used in a wide range of applications due to its versatility. In the paper industry, it serves as a retention aid and enhances paper quality. In the electronics sector, colloidal silica is used for polishing silicon wafers. Other applications include catalysis, coatings, and ceramics where its binding and stabilizing properties are valued.

Silica Sol

Silica sol finds its primary use in more specialized applications that benefit from its uniform particle size and stability. It is widely used in precision casting, particularly in the investment casting of metals, where it acts as a binder for refractory materials. Silica sol is also used in the production of advanced ceramics, coatings, and as a polishing agent in the semiconductor industry.

Stability and Handling

Colloidal Silica

The stability of colloidal silica is influenced by factors such as pH, ionic strength, and temperature. It is crucial to maintain these parameters within specific ranges to prevent the agglomeration of silica particles. Colloidal silica must be handled with care to avoid contamination and ensure consistent performance in applications.

Silica Sol

Silica sol, due to its controlled production process, exhibits higher stability compared to general colloidal silica. It can withstand a wider range of conditions without significant changes in its properties. This stability makes silica sol easier to handle and more reliable in critical applications where consistency is paramount.

Conclusion

In summary, while colloidal silica and silica sol are both silica-based dispersions used in various industries, they differ in terms of composition, production methods, applications, and stability. Colloidal silica is a broad category with diverse uses, whereas silica sol is a more specialized product with controlled properties suited for high-precision applications.

For those seeking more information or interested in purchasing these materials, contact us to discuss your needs with a reliable supplier who can provide detailed guidance and high-quality products tailored to your specific requirements.

Contact us to discuss your requirements of electronic grade silica sol. Our experienced sales team can help you identify the options that best suit your needs.