antifoamer

antifoamer

Silicone defoamer is a compound emulsion with polydimethylsiloxane as the main active component, together with emulsifier and dispersion aid. It is insoluble in water, but can be easily dispersed in aqueous system to form stable emulsion. It has low surface tension and excellent foam-breaking and foam-suppressing performance. It shows good chemical stability within a wide temperature and pH range, and will not decompose or lose efficiency rapidly under neutral, weakly acidic and weakly alkaline conditions. It does not react with most water treatment chemicals. Strong concentrated acid, strong alkali and high temperature for a long time will break the emulsion system, causing oil separation and decline of defoaming effect. It is non-flammable, low volatile, and has little influence on the basic properties of the treated medium at normal dosage. It will not affect the activity of biological bacteria when used in biochemical wastewater treatment tanks under proper adding amount.

Applicaion of antifoamer

Silicone defoamer is a high-efficiency foam control agent based on polydimethylsiloxane emulsion system. It can rapidly penetrate into foam films, reduce the surface elasticity of foam walls and accelerate foam rupture, while forming a hydrophobic barrier on the liquid surface to suppress the regeneration of new foam. It is suitable for foaming systems caused by surfactants, protein substances, organic colloids and microbial metabolites. In wastewater treatment, it is widely used in aerobic biochemical pools, anoxic pools, flotation tanks, aeration tanks, sedimentation tanks and sludge thickening & dewatering processes to solve massive foam issues induced by high organic load, aerobic aeration and extracellular polymer substances. It is also applied in papermaking pulp preparation, white water circulation and paper coating sections to reduce foam interference to fiber retention and sheet forming. In textile printing and dyeing, it controls foam in desizing, scouring, bleaching and dyeing baths to guarantee uniform dyeing quality. It works steadily in fermentation, monosodium glutamate, antibiotic and enzyme production industries without restraining the growth of strains at recommended dosage. Other typical application fields include paint and latex coating production, adhesive processing, chemical synthesis, circulating cooling water, seawater desalination and mineral flotation. It has obvious advantages such as fast defoaming rate, long foam inhibition duration, low addition amount and wide adaptability to temperature and pH. Its emulsion structure makes it easy to disperse evenly in aqueous media. It shows good compatibility with flocculants, coagulants, scale inhibitors and non‑oxidizing biocides under normal working conditions. However, it should be avoided in processes with strict silicon limit, such as certain ultrafiltration, reverse osmosis and electronic-grade water systems, because silicon deposition may cause membrane or equipment fouling. It can be added by metering pump continuously or dosed intermittently at foaming points. Dilution with clean water before use is optional according to on-site working conditions. Compared with polyether and mineral oil defoamers, silicone defoamer maintains stable performance at higher temperature and will not produce oil stains on finished products easily.

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