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Defoamer manufacturers guide you through the advantages of silicone-based defoamers.
Release Date:
2021-12-03
As industry continues to advance, defoamers—key auxiliary agents in production—are receiving increasing attention across various sectors. Their varieties are expanding, and their performance is steadily improving. Next, a defoamer manufacturer will provide an in-depth overview of silicone‑based defoamers.
As industry continues to advance, defoamers—key auxiliary agents in manufacturing—are receiving increasing attention across various sectors. Their variety is steadily expanding, and their performance is continuously improving. Next, a leading defoamer manufacturer will provide an in-depth overview of silicone‑based defoamers.
Silicone-based defoamers primarily use aqueous siloxanes as the active ingredient, often formulated with additional carrier surfactants. They are characterized by low surface tension, high surface activity, strong defoaming performance, minimal dosage requirements, and low cost. The following are the advantages of silicone‑based defoamers in practical applications:
1. Wide range of applications: Due to its unique chemical structure, silicone oil is neither soluble in water nor in substances containing polar functional groups, nor in hydrocarbons or organic compounds containing hydrocarbon moieties. Because of its insolubility in various materials, silicone oil boasts a broad spectrum of applications and can be used effectively in both aqueous and oily systems.
2. Low surface tension: Silicone oil typically exhibits a surface tension of 20–21 dynes/cm, which is lower than that of water (72 dynes/cm) and most conventional defoaming agents, resulting in excellent defoaming performance.
3. Excellent thermal stability: Taking commonly used dimethyl silicone oil as an example, it can withstand temperatures up to 150°C for extended periods and over 300°C for short durations, with its Si–O bonds remaining intact. This ensures that silicone‑based defoamers can be employed across a broad temperature range.
4. Excellent chemical stability: Due to the high stability of the Si–O bond, silicone oils exhibit outstanding chemical stability and are highly resistant to chemical reactions with other substances. Consequently, provided it is formulated appropriately, an organosilicone defoamer can be used in systems containing acids, bases, or salts.
5. Physiological inertness: Silicone oil has been shown to be non‑toxic to humans and animals, with an LD50 exceeding 34 g/kg. Therefore, silicone‑based defoamers—when formulated with appropriate, non‑toxic emulsifiers—can be safely used in industries such as food, healthcare, pharmaceuticals, and cosmetics.
6. Strong defoaming performance: Silicone‑based or water‑soluble defoamers not only effectively break existing foam but also significantly inhibit foam formation, preventing its generation. They require only a very small dosage—typically one part per million (1 ppm) of the foaming medium—to achieve effective defoaming. The typical application range is 1 to 100 ppm. In addition to being cost‑effective, they do not contaminate the substances being treated.
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