Defoamers are widely used and has a wide variety. The application of water treatment defoamers is more than 60% of the defoamer market. How to choose the right products in many water treatment defoamers? How do you know the addition level of water treatment defoamer? The use of poor defoamers is not only time-consuming and costly, the foam problem can not be solved, and even affects the benign operation of the water treatment system itself.
How to choose water treatment defoamer
1.Water treatment Defoamer should be insoluble or poorly soluble in the foaming liquid to break the foam. The water treatment defoamer should be concentrated on the bubble film, and should remain in such a state for the foam inhibition. The water treatment defoamer used in the water system, the molecule of its active ingredient must be strong hydrophobic and weak hydrophilic, and the HLB value can be controlled within the range of 1.5-3 to achieve the best effect. Therefore, the defoamer is supersaturated in the foaming liquid, and it can easily reach the supersaturation state only if it is insoluble or poorly soluble. Insoluble or poorly soluble, it is easy to accumulate at the gas-liquid interface, and it is easy to concentrate on the bubble film to function at a lower concentration.
2.The surface tension is lower than that of the foaming liquid, and only the force between the molecules of the water treatment defoamer is small, and the surface tension is lower than that of the foaming liquid, and the defoamer particles can be immersed and expanded on the bubble film. It is worth noting that the surface tension of the foaming liquid is not the surface tension of the solution, but the surface tension of the foaming solution.
3.The water treatment defoamer requires a certain degree of affinity with the foaming liquid, because the defoaming process is actually the competition between the foam collapse speed and the foam formation speed, so the water treatment defoamer must be able to be rapidly disperse in the foaming liquid in order to be able to function quickly in a large range in the foaming liquid. Therefore, in order to make the defomaer spread faster, the active ingredient of the defoamer must have a certain degree of affinity with the foaming liquid. The active ingredient of the defoamer and the foaming liquid will dissolve when too close and will be difficult to disperse when too thin. Only when it is appropriate, the effect will be good. This is also the technical point of water treatment defoamer.
4.There must be no chemical reaction between the water treatment defoamer and the foaming liquid. If the defoamer reacts with the foaming liquid, on the one hand, the defoamer will lose the defoaming effect, on the other hand, harmful substances may be generated and the microorganisms growth may be affected and affect the operation of the water treatment system.
5.The volatility of the water treatment defoamer must be small, and the foam inhibition time must be long.
Post time: Jun-20-2019