Do you know how to choose defoamer correctly?
Defoamers and antifoams can be divided into five categories according to their forms: solid particle defoamer, lotion defoamer, dispersed defoamer, oil defoamer and paste defoamer;
According to their application in different industrial production, they can be divided into textile industry defoamer, papermaking defoamer, wastewater treatment defoamer antifoam, coating defoamer, food industry defoamer, and petroleum industry defoamer antifoam.
According to their chemical structure and composition, they can be divided into mineral oils, alcohols, fatty acids, and fatty acid ester defoamer, amide defoamer, phosphate ester defoamer, organosilicon defoamer antifoam, polyether defoamer, and polyether modified polysiloxane defoamer.
So how to choose the right defoamer?
In order to break the foam, the defoamer should be concentrated on the foam film. For the case of defoamers, they should be concentrated and concentrated instantly, and for the case of foam suppressants, they should be kept in this state frequently. So defoamers are in a supersaturated state in the foaming solution, and only insoluble or insoluble can they easily reach a supersaturated state. Insoluble or insoluble, it is easy to aggregate at the gas-liquid interface, concentrate on the bubble membrane, and function at lower concentrations. For defoamers used in water systems, the molecules of the active ingredient must be strong hydrophobic and weak hydrophilic, with an HLB value in the range of 1.5-3 for the best effect.
Only when the intermolecular force of defoamers is small and the surface tension is lower than that of the foaming solution, can defoamer particles immerse and expand on the foam film. It is worth noting that the surface tension of the foaming solution is not the surface tension of the solution, but the surface tension of the co foaming solution.
Since the defoaming process is actually a competition between the foam collapse speed and the foam generation speed, the defoamer must be able to disperse rapidly in the foaming liquid so that it can quickly play a role in a wider range of foaming liquid. To make defoamers diffuse quickly, the active ingredients of defoamers must have a certain degree of affinity with the foaming solution. The active ingredients of defoamers are too close to the foaming solution and will dissolve; Too sparse and difficult to disperse. Only when close and distant are appropriate, can the effectiveness be good.
The defoamer reacts with the foaming solution, causing the defoamer to lose its effectiveness and potentially producing harmful substances that affect the growth of microorganisms.
Firstly, it is necessary to determine the system that requires the use of defoamers, whether it is water-based or oil-based. In the fermentation industry, oil-based defoamers such as polyether modified silicon or polyether based ones should be used. The water-based coating industry requires water-based defoamer and organosilicon defoamers. By selecting the defoamer, comparing the amount added, and then referring to the price, the most suitable and economical defoamer product can be obtained.
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