In the realm of industrial materials, precipitated silica stands out as a versatile and indispensable component across various sectors.
Characteristics of Precipitated Silica
Precipitated silica, often referred to as synthetic amorphous silica, is a white powder with a CAS number of 10279-57-9. It possesses a BET surface area ranging from 35 to 350 square meters per gram, making it highly effective for a multitude of uses. This material is characterized by its purity, typically 95%, and its origin can be traced to various regions globally, including China.
Production Process
The production of precipitated silica involves a complex chemical reaction. It typically begins with the reaction of an alkali metal silicate with a mineral acid at temperatures ranging from 60 to 95 degrees Celsius. During this process, the pH is maintained, and stirring continues for a duration of 7.5 to 10.5 hours. The reaction continues until a precipitate forms with a suspension solids concentration of 90 to 120 grams per liter. The pH is then adjusted to less than or equal to 5, and the precipitate is filtered, washed, dried, and if necessary, ground to achieve the desired particle size.
Applications of Precipitated Silica
Precipitated silica finds widespread application in various industries:
●Plastics and Rubbers: It acts as a reinforcing filler, improving tensile strength, tear resistance, and wear properties.
●Paper Manufacturing: It enhances the opacity, brightness, and printability of paper products.
●Inks and Coatings: Its high surface area and adsorbency make it ideal for use in inks and coatings, providing improved flow and coverage.
●Food and Feed Grades: Precipitated silica is also used as an anti-caking agent, free-flow agent, and glidant in food and feed applications.
Industry-Specific Attributes
In the realm of industry-specific attributes, precipitated silica demonstrates its versatility:
High Surface Area: Its large surface area allows for enhanced interaction with other materials, making it effective in various catalytic and adsorptive processes.
Chemical Stability: It is resistant to many chemicals, making it suitable for use in harsh environments.
Non-toxic and Inert: Precipitated silica is generally regarded as safe for use in food, cosmetics, and pharmaceuticals.
Conclusion
Precipitated silica is a critical material in the modern industrial landscape. Its unique properties and wide range of applications make it indispensable across various sectors. From plastics and rubbers to paper manufacturing and inks, precipitated silica continues to play a pivotal role in driving innovation and efficiency. With suppliers committed to delivering high-quality, customized solutions, the future of precipitated silica looks promising, promising to continue shaping the technological advancements of tomorrow.