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Nov 23, 2020
Silicone defoamer is a white viscous emulsion. It has been used in various industrial fields since the 1960s, but large-scale and comprehensive rapid development started in the 1980s. As an organosilicon defoamer, its application fields are also very wide, attracting more and more attention from all walks of life. In the chemical, paper, coating, food, textile, pharmaceutical and other industrial sectors, silicone defoamer is an indispensable auxiliary in the production process. It can not only remove foam on the liquid surface of the process medium in the production process, thereby improving filtration, The separation, gasification, and drainage effects of washing, extraction, distillation, evaporation, dehydration, drying and other technological processes ensure the capacity of containers for various materials.
Advantages of silicone defoamers
(1) Wide application range: Due to the special chemical structure of silicone oil, it is neither compatible with water or substances containing polar groups, nor with hydrocarbons or organic substances containing hydrocarbon groups. Due to the insolubility of silicone oil to various substances, it has a wide range of applications. It can not only use water system to defoam, but also can be used in oil system.
(2) Low surface tension: The surface capacity of silicone oil is generally 20-21 dyne/cm, which is smaller than that of water (72 dyne/cm) and general foaming liquids, and has good defoaming performance.
(3) Good thermal stability: Taking the commonly used dimethyl silicone oil as an example, it can withstand 150°C for a long time and 300°C for a short time, and its Si-O bond will not decompose. This ensures that the silicone defoamer can be used in a wide temperature range.
(4) Good chemical stability: Because the Si-O bond is relatively stable, the chemical stability of silicone oil is very high, and it is difficult to chemically react with other substances. Therefore, as long as the formulation is reasonable, silicone defoamers are allowed to be used in systems containing acids, alkalis and salts.
(5) Physiological inertia: Silicone oil has been proven to be non-toxic to humans and animals, and its half-lethal dose is greater than 34 g/kg. Therefore, silicone defoamers (with suitable non-toxic emulsifiers, etc.) can be safely used in the food, medical, pharmaceutical and cosmetic industries.
(6) Strong defoaming power: Silicone defoamer can not only effectively break the foam that has been generated, but also can significantly inhibit the foam and prevent the formation of foam. Its usage is very small, as long as adding one part per million (1ppm) of the foaming medium weight, it can produce defoaming effect. The commonly used range is 1 to 100 ppm. Not only is the cost low, but also does not pollute the defoamed substance.
Use of silicone defoamer
Silicone defoamers have a wide range of uses and applications, and are used in erythromycin, linomycin, abamectin, gentamicin, penicillin, oxytetracycline, tetracycline, tylosin, glutamic acid, lysine Acid, citric acid, xanthan gum and other fermentation industries are used as defoamers. It is also used in textiles, printing and dyeing, coatings, dyes, papermaking, printing inks, oil fields, sewage treatment and other fields. When used in printing and dyeing, it has good compatibility with the additives in the dyeing bath, and does not affect the shade and color fastness.
Organosilicon is used as a spray dye defoaming agent, and there have been many reports in the literature. In the old dyeing process, dimethyl polysiloxane defoamer is generally used to achieve satisfactory defoamer effect and ensure uniform dyeing. But the new dyeing process uses high-temperature and high-pressure machinery, in which the dyed material is moved by the jet of dyeing liquid and dyed at the same time. Although the generated foam can be defoamed by ordinary silicone defoamers, under high temperature and high pressure, ordinary silicone defoamers will produce film-like precipitation and cause spots on the dyed object. The above shortcomings can be overcome by using block copolymers, because these defoamer components can be dissolved in cold water, but not in hot water, so they can have a defoaming effect. But the defoaming effect of this copolymer defoamer alone is not satisfactory. If a certain amount of misty SiO2 is added to the copolymer, a satisfactory defoaming effect can be achieved and a uniformly dyed fabric can be produced. . Used for defoaming in high temperature dyeing process and fermentation process of polyester fabric. In addition, it can also be used for the defoaming of the diethanolamine desulfurization system and the defoaming of various oils, cutting fluids, antifreeze, water-based inks and other systems. It is also suitable for the printing industry to wash off the uncured resin after the photosensitive resin plate is made. Foam is a very representative, excellent performance and versatile silicone defoamer.