What is hydrophobic fumed silica used for?

Hydrophobic fumed silica is generally a post-treated product. SiSiB hydrophobic silicas is produced by the chemical reaction of hydrophilic silica with reactive silanes or silicone fluids, like chlorosilanes, hexamethyldisilazane and polydimethysiloxane. They have water-repellent properties and are no longer dispersible in water.

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SiSiB fumed silicas are widely used in silicone adhesives & sealants, silicone elastomers, coatings & inks, composites, personal care cosmetics and fire extinguisher. They are used to for rheology control (thickening, anti-sag, anti-setting, thixotropy), reinforcing (improve strength).

Hydrophobic silicas are very effective thixotropic in polar adhesives and sealants like isocyanate resins, epoxy resins, silicone resins, polyurethane resins and vinylester resins. And they can be used for reinforcing silicones without thickening.

Additionally, SiSiB hydrophobic fumed silica improves the water resistance of moisture-sensitive formulations such as cosmetic preparations and flowability of powders.

Also, hydrophobic pyrogenic silica by SiSiB, a reliable silicone manufacturing company, has excellent storage stability and process ability; they are widely used as an anti-settling and anti-sagging agent of pigments. 

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In the realm of nanomaterials, fumed silica emerges as a versatile substance with properties that can be tailored for various applications. One significant distinction lies in its hydrophilic and hydrophobic attributes. Understanding the factors influencing the selection between these two forms of fumed silica is paramount for optimizing product performance. Let&#;s delve into the world of fumed silica and explore the key considerations that shape this choice.

The Genesis of Fumed Silica

Fumed silica comes into being through a high-temperature hydrolysis process involving silicon halides in a hydrogen-oxygen flame. The resultant nanoscale amorphous powder exhibits unique characteristics that find utility across diverse industries.

What Are The Materials And Processes Used To Manufacture Fumed Silica?

Fumed silica, or pyrogenic silica, colloidal silicon dioxide, is an amorphous white inorganic powder that has high specific surface area, nano-scale primary particle size and a relatively high (among silica&#;

Hydrophilic Fumed Silica: Properties and Applications

Hydrophilic fumed silica is characterized by surface hydroxyl groups that readily interact with water molecules, endowing it with water-attracting qualities. This type of fumed silica smoothly wets surfaces and disperses within water-based systems. It&#;s particularly suited for non-polar or low-polarity products.

Applications of hydrophilic fumed silica extend to non-polar systems such as methyl siloxanes, polyvinyl chloride (PVC), and various hydrocarbons. It also finds a place in low-polarity systems like MS Polymers and STP-E, contributing to stability and dispersion.

Hydrophobic Fumed Silica: A Shift in Properties

By treating hydrophilic fumed silica with modifying agents, its surface hydroxyl groups can be either reacted or masked, leading to hydrophobicity. Hydrophobic fumed silica repels water, making it ideal for medium to high-polarity systems.

In contrast to its hydrophilic counterpart, hydrophobic fumed silica suits systems like polyurethanes, polyols, epoxy resins, and other polar environments. Its reduced polarity aligns with higher-polarity product systems.

Why Fumed Silica Need To Be Treated To Be Hydrophobic?

Fumed silica is available in both hydrophilic and hydrophobic forms. However, its hydrophilic nature makes it unsuitable for certain applications. Untreated fumed silica has many silanol groups on its surface,&#;

Factors Influencing the Choice

Three primary factors govern the selection between hydrophilic and hydrophobic fumed silica:

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1. Inherent Properties of Fumed Silica

The polarity of the product system determines the compatibility of fumed silica. Hydrophilic fumed silica aligns with non-polar and low-polarity systems, whereas hydrophobic fumed silica is suited for medium to high-polarity environments. As the polarity of the system increases, the polarity of the fumed silica should decrease.

2. Application System and Scenario

The nature of the application system is a key determinant. Hydrophilic fumed silica finds favor in non-polar systems such as PVC, while hydrophobic fumed silica is fitting for epoxy resins and high-polarity environments. Matching the fumed silica polarity to the application system is crucial for optimal performance.

3. Cost Considerations

Cost plays a significant role in the selection process. Hydrophilic fumed silica is generally more cost-effective than its hydrophobic counterpart. This aspect is vital for applications where cost sensitivity is a primary concern.

conclusion

In conclusion, the choice between hydrophilic and hydrophobic fumed silica rests on a careful analysis of the product&#;s nature, the application system, cost considerations, and the desired dispersion method. Hydrophilic fumed silica is best suited for products requiring interaction with water molecules, while hydrophobic fumed silica serves well in scenarios where water repellency or specific processing methods are required. Ultimately, the decision should be aligned with the product&#;s requirements and the overall cost-effectiveness of the chosen fumed silica variant.

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My name is Van, I&#;m the business manager of HIFULL, I have been in Fumed Silica Industry for more than 10 years. Feel free to contact me. I&#;m happy to provide you the best service and products.

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