In industrial production, some places that will produce foam will often use defoamer to eliminate harmful foam produced in the production process. In the process of using antifoam agent may also encounter many problems, today we will sum up the following problems and effects.






First, the problem of defoamer turbidity


The defoamer does not exist in the system in a dissolved state, but is generally suspended in the system, so the amount and color of the selected hydrophobic particles, silicone oil, and hydrophobic particles are crucial, which causes the performance of the defoamer to vary greatly, but as long as the defoamer effect is good and the foam suppression time is long, there is no big problem.






Second, the problem of anti-foaming time


The properties of silicone oil in defoamer determine the time of defoamer. The amount of silicone oil content determines the length of time that the defoamer is used in the system. The size of the particle size of the defoamer determines the filter resistance of the defoamer. If the particle size is too large or the defoamer is not sufficiently stirred, the defoamer used in sewage treatment will be filtered out many times. If the defoamer is filtered out in the filtration, it will affect the defoamer and the defoamer.






Third, the failure of defoamer


Acid and base stability problems, if the anti-foaming acid and alkali resistance is not good, resulting in the decomposition of silicone oil, resulting in the failure of anti-foaming agent; Certain chemicals dissolve the silicone oil into the system, so that the defoamer no longer has the effect of defoamer, but as a surfactant exists in the system, the system will foam more than without the addition of the defoamer.


The correct use of defoamer can achieve double the effect with half the effort. There are many kinds of defoamer on the market. The common ones are fermentation defoamer, sewage treatment defoamer, silicone defoamer, textile printing and dyeing defoamer, polyether defoamer and so on. Therefore, the appropriate defoamer must be selected according to the industry and application system, and the effect will be more obvious only in this way.






Four, enumerate the role of defoamer


Defoamer is mainly used to reduce surface tension and eliminate foam during processing. Foam production is mostly under the action of external forces, the surfactant contained in the solution at the interface between the solution and the air into the formation of bubbles and float, or like gelatin, protein and other colloidal substances into film, bubble caused. In food processing, such as fermentation stirring, boiling, concentration and other processes can produce a large number of bubbles, affecting the normal operation, must be eliminated in time or not produced.






Defoamer can be roughly divided into two categories: one can eliminate the generated bubbles, such as ethanol; The other can inhibit the formation of bubbles, such as emulsified silicone oil; At present, there are 7 kinds of defoamer permitted in China, such as emulsified silicone oil, high carbon alcohol fatty acid ester complex, polyoxyethylene polyoxyepropylene pentaerythritol ether, polyoxyethylene polyoxyepropanolamine ether, polyoxyepropylene glycerol ether, polyoxyethylene oxyglycerol ether and polydimethylsiloxane