Organosilicon defoamer introduction-HongYe silicon...

Organosilicon defoamer introduction       Defoaming agent is used to suppress or eliminate surfactant foam in various production processes. When adding defoaming agent in the foam fluid, because of defoaming agent has low surface tension, therefore, bubble membrane contact arc surface tension foam part decrease dramatically, the surface tension is out of balance and the bubble film to rupture strength decrease, so as to achieve the purpose of defoaming.       Defoaming agent is used to suppress or eliminate surfactant foam in various production processes. When adding defoaming agent in the foam fluid, because of defoaming agent has low surface tension, therefore, bubble membrane contact arc surface tension foam part decrease dramatically, the surface tension is out of balance and the bubble film to rupture strength decrease, so as to achieve the purpose of defoaming. Consumer type foaming agent is more, silicone, polyether, fat, fatty acids, esters, alcohols, ethers, amines, etc.. But using silicone and polyether two defoamer performance is superior, wide application range, variety is also more, at present domestic and foreign development and production of most of the species in the two class. Especially the organosilicon defoamer, because of its excellent characteristics, has been recognized as an ideal and promising defoaming agent. Defoamer agent the following advantages: 1 wide application: because of the special chemical structure of silicone oil, it is neither with water or a polar group-containing substances dissolves, dissolved organic matter and not containing hydrocarbons or hydrocarbon. Therefore, defoaming agent in water, animal and plant oil and mineral oil in high boiling point uniformly dissolved. The insoluble silicone on all kinds of material, and wide application, not only the use of water system defoaming, and also can be used in oil system. 2.Surface tension is small: kinds of viscosity of silicone oil, its surface is generally 20-21 dyne / cm, than water (72 dyne / cm) and general foaming liquid surface tension are much smaller, this is also another reason defoamer agent wide application. 3 good thermal stability: to two methyl silicone oil used as example, it long time can withstand 150 degrees Celsius, the short time can be more than 300 degrees Celsius, the Si-O decomposition. To ensure the defoaming agent can be used in wide temperature ranges. 4 good chemical stability: due to the Si-O key is relatively stable, so the chemical stability of silicone oil is very high, it is difficult to react with other substances. Therefore, as long as reasonable formulation, defoaming agent allows the use of acid, alkali, salt system. 5 physiological inert: silicone oil has been shown to have no toxicity to human and livestock, the half lethal dose greater than 34 g / kg. So the organosilicon defoamer (in a suitable emulsifier Mix) can be safely used in food, medical, pharmaceutical and cosmetics industry. 6 defoaming ability: defoaming agent not only can effectively get rid of the generated bubble, but also can significantly inhibit the bubble, to prevent the bubble. Its use is very few, one millionth as long as adding foaming weight (1ppm), which can produce the defoaming effect. The range is 1 to 100ppm. Used in this way, not only low cost, and no pollution was defoaming substances. The organosilicon defoaming agent has the advantages mentioned above, so the application of more and more used in place of other types of defoaming agent, especially in the pharmaceutical, medical and food fermentation industry, other types of defoaming agent is unable to compare. Organosilicon defoamer according to the physical form of pure silicone oil, silicone oil, silicone oil mixture solution (silicon cream) and four types of silicone oil emulsion. But no matter what kind of antifoaming agent, must have the following conditions: The ability of eliminating surface 1 surface agent should be less than the blister fluid; 2 defoaming agent must be insoluble in blister fluid; 3 defoaming agent must be well dispersed in the foaming liquid or maintain good contact. At the same time, in order to obtain the defoaming effect, defoaming agent should be added in the bubble before. Of course, in case of emergency, also can be added at any time in order to eliminate acoustic foam.