Why is the purity of Low Sodium Type Colloidal Silica/Silica Sol so high?

Low Sodium Type Colloidal Silica/Silica Sol is a basic material widely used in many high-tech industries, and has attracted much attention for its extremely high purity and good physical and chemical properties. It is mainly composed of a stable colloidal solution formed by nano-scale silica particles dispersed in water. High purity is the key characteristic of this material, especially in the fields of electronics, semiconductors, precision casting, etc., the high purity of low sodium type colloidal silica sol makes it the first choice. So, what factors determine the high purity of low sodium type colloidal silica?

1. The purity of low sodium type colloidal silica sol is closely related to the raw materials used in its preparation process. In order to ensure that the final product has extremely high purity, the silica raw materials selected in the production process must meet high purity standards. Usually, the impurity content in these raw materials is extremely low, especially the content of metal ions and alkali metals (such as sodium, potassium, etc.) is strictly controlled. By using high-purity silica powder or solution as the base material, silica sol can ensure the purity of its chemical composition at the source.

2. Advanced purification technology is used in the preparation of low-sodium silica sol to remove impurities and unwanted elements as much as possible. In the process of preparing silica sol, high-temperature hydrolysis is usually used to generate nano-sized silica particles, and impurities are continuously removed through filtration and centrifugation. In particular, for the removal of sodium ions, special process technology is used to make the sodium ion content in the silica sol reach an extremely low level to ensure that it meets the characteristics of low sodium. These complex and precise purification processes significantly improve the overall purity of the product.

3. In the process of preparing low-sodium colloidal silica, the control of the production environment is crucial. The introduction of any external impurities will affect the purity of the silica sol. Therefore, the production facilities must be carried out in a dust-free environment to avoid contamination by particulate matter, metal particles and other impurities in the air. At the same time, the reaction equipment and containers must also be made of inert materials to avoid chemical reactions with the reactants. Usually, these reactors will use specific materials, such as glass or corrosion-resistant metals, to ensure that no additional impurities are introduced during the production process.

4. Another key factor in the high purity of low-sodium silica sol is the removal of sodium ions. Ordinary silica sol may contain a small amount of sodium ions, which come from the solvent or by-products of the reaction process. In order to produce low-sodium products, special ion exchange technology or reverse osmosis process is used in the production process, through which most of the sodium ions are effectively removed, so that the sodium content in the final product is extremely low. Low sodium content helps to improve the chemical purity of silica sol and significantly enhances its heat resistance and stability.

5. The high purity of low-sodium colloidal silica also depends on multiple filtration and fine separation processes. By using nano-filters and ultrafiltration equipment, most of the impurities in silica sol can be completely filtered out. Especially in the final stage of production, silica sol will undergo several precision filtrations to ensure the uniformity of particle distribution and the high purity of the material. These multiple filtration steps can remove tiny particles, ionic impurities and other potential contaminants to ensure that the final purity of the product meets the requirements.