Product Details
CasNo： 63148-62-9
MF： C6H18OSi2
Appearance： liquid
Delivery Time： 15 days
Packing： 200kg/drum
Purity： 99%
Product Details
Defoamer (Brand Model: 824)
Packaging Specification: 200 kilograms per blue - colored barrel
Composition
- Main Active Ingredient: Usually linear polysiloxane, and polydimethylsiloxane (silicone oil) is the most commonly used. Besides, there are also types like fluorosiloxane and ethylene glycol siloxane.
- Auxiliary Ingredients: Include emulsifiers (which evenly disperse silicone oil in water to form a stable emulsion system), stabilizers (used to improve the stability and shelf - life of the defoamer, preventing stratification and precipitation), and carriers (generally water or liquid paraffin, etc., which play the role of carrying and diluting).
Product PropertiesGenerally, it is a white viscous emulsion. There are also some semi - transparent liquid organic silicon defoamer products. The pH value is mostly between 6 and 8, and it is a weakly anionic or non - ionic type.
Working Principle
- Reducing Surface Tension: Surfactant molecules in the defoamer are adsorbed on the surface of the bubbles, significantly reducing the surface tension of the liquid, making it easier for the bubbles to be released from the liquid.
- Forming a Molecular Film: Its molecules can form a thin molecular film with strong adsorption capacity on the liquid surface. When the bubbles come into contact, they burst and dissipate under the action of surface tension.
- Inhibiting Gas Diffusion and Foam Generation: The lipophilic groups are adsorbed on the surface of the bubbles to form a stable film, which hinders the dissolution and aggregation of gas to form new bubbles.
Outstanding Advantages
- Powerful Defoaming Ability: It can effectively break the generated foam and significantly inhibit foam generation. Generally, adding one part per million (1ppm) of the weight of the foaming medium can achieve the effect. The common usage range is 1 - 100ppm. It has a low cost and does not contaminate the defoamed substance.
- Low Surface Tension: The surface tension of silicone oil is usually 20 - 21 dynes/cm, which is much lower than that of water (72 dynes/cm) and general foaming liquids, so the defoaming efficiency is excellent.
- Good Thermal Stability: Taking dimethyl silicone oil as an example, it can withstand 150°C for a long time and can withstand a high temperature of more than 300°C in a short time, and the Si - O bond will not decompose, making it suitable for a wide temperature range.
- Good Chemical Stability: The Si - O bond is stable, and the chemical properties are stable, making it difficult to react with other substances. Therefore, it can be used in systems containing acids, alkalis, and salts.
- Physiological Inertness: It is non - toxic to humans and animals, with a median lethal dose of more than 34 g/kg. With suitable non - toxic emulsifiers, it can be safely used in industries such as food, medical treatment, pharmaceuticals, and cosmetics.
- Wide Application Range: Due to the special chemical structure of silicone oil, it is neither miscible with water or substances containing polar groups, nor with hydrocarbons or hydrocarbon - containing organic substances. So it can be used in both water - based and oil - based systems.
- Environmentally Friendly and Economical: Its biochemical oxygen demand (BOD) is extremely low, which is friendly to the environment; only a small amount needs to be added to achieve high - efficiency defoaming, with a low cost of use and no impact on product performance.
Scope of Application
- Paper - making Field: In the processes of pulp washing and screening, as well as bleaching and wastewater treatment (especially for the treatment of black liquor that is difficult to defog), it can reduce the air content in the pulp and improve the overall production efficiency of pulp washing; it can also eliminate the foam generated by lignin and other surfactants.
- Chemical Industry Field: Such as in polymerization reactions, chemical reactions, solvent extraction, fermentation processes, etc., it is used to control the generation and diffusion of bubbles and foams, improving process efficiency and product quality.
- Food Field: Used for defoaming in the food processing process to ensure the smooth progress of production, and it is safe and non - toxic.
- Pharmaceutical Field: In the fermentation, concentration and other links of pharmaceutical production, it eliminates foam to ensure product quality.
- Textile Field: It plays a defoaming role in the textile sizing process, improving the quality of textiles.
- Sewage Treatment: During the sewage treatment process, it eliminates the foam generated by various substances, assisting the sewage treatment process.
Packaging and StorageIt is usually packaged in 200 - kilogram plastic barrels. There are also other packaging forms, such as 25 - kilogram plastic barrels. It should be stored at room temperature and avoid exposure to sunlight. Generally, the shelf life is one year.
