I. Technical Definition and Core Ingredients
Silicone defoamers are functional additives based on polydimethylsiloxane (silicone oil). They rapidly eliminate and persistently suppress foam by reducing liquid surface tension. Their chemical inertness imparts resistance to high temperatures, acids, alkalis, and oxidation. Their physical stability is reflected in their resistance to crystallization at low temperatures and volatility at high temperatures. In a typical formulation, silicone oil comprises 60%-80% of the total composition, supplemented by hydrophobic silica (as a synergist), emulsifiers (such as polyoxyethylene ether), and water or mineral oil as a carrier, forming a white, viscous emulsion with a stable pH between 6 and 8.

II. Performance Advantages and Application Scenarios
Highly Efficient Defoaming and Long-Lasting Foam Suppression
Silicone oil particles disrupt the gas-liquid interfacial tension, creating weak points in the foam bilayer and enabling rapid foam breakdown. For example, in the papermaking and pulping process, a 0.05%-0.1% addition can reduce foam height by 90% while suppressing new foam formation for over 8 hours. Penetration into Multiple Industries
Textile printing and dyeing: In the sizing process, water-based emulsion defoamers at a dosage of 0.2-0.25g/L eliminate sizing foam and prevent fabric defects.
Petrochemical: Ethyl silicone oil emulsions added to drilling mud maintain defoaming activity even at temperatures of 150°C, preventing spraying accidents.
Food and pharmaceuticals: FDA-compliant medical-grade defoamers increase dissolved oxygen efficiency by 15% in biopharmaceutical fermentation, shortening fermentation cycles.
Environmental and Economical: Compared to mineral oil defoamers, silicone products require 50%-70% less volume, and their biochemical oxygen demand (BOD) is less than 5mg/L, meeting environmental emission requirements. In paint production, their use can reduce in-tank foam volume by 95%, significantly improving filling efficiency.