The choice of quality of defoaming agent should conform to what factors?-Iota

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Service > The choice of quality of defoaming agent should conform to what factors?

The choice of quality of defoaming agent should conform to what factors?

We must first determine the need to use the defoaming agent system is water system or oily system.As the fermentation industry, you should use oily defoamer, such as polyether modified silicon orpolyether. Water-based paint industry to water-based defoaming agent, defoaming agent. Choose adefoaming agent, adding in the comparison, the reference price, the most suitable defoaming agentproducts the most economical. The quality of defoaming agent should comply with the following:

In 1, foaming liquid insoluble or sparingly soluble

For the burst bubble defoaming agent, should be concentrated, in a bubble on. Of Foamicidesituation, should concentrate in an instant, the defoaming situation should be kept in this state. So the defoaming agent in foaming solution is supersaturated, only the solubility is easy to reach saturation. Solubility, it is easy to gather at the gas-liquid interface, it is easy to concentrate in a bubble, can play a role in low concentration. For the water system of defoaming agent, molecularactive ingredients, must be strong weak hydrophobic hydrophilic, HLB value in the range of 1.53,only the best effect.

2, the surface tension is lower than the foaming liquid

Only the defoamer intermolecular force is small, the surface tension is lower than the foaming liquid,defoaming agent particles can and immersed in the film bubble expansion. It is worth noting that,surface tension of the solution is not foaming liquid, but also the surface tension of global solution.

3, and foaming liquid affinity to a certain extent

The defoaming process is actually the collapse of the bubble velocity and bubble formation ratecompetition, so the defoaming agent must be able to quickly dispersed in the foaming liquid, play a role in foaming liquid in order to quickly range widely in. To make the defoaming agent spread rapidly, eliminating affinity agent and foaming liquid active ingredients must have a certain degree of. Defoaming agent active ingredient and foaming liquid too dear, will dissolve; too sparse anddifficult to disperse. Only appropriate affinities, efficiency will be good.

4, and the foaming liquid is not a chemical reaction

Defoaming agent and foaming liquid reaction, a defoaming agent will lose effect, on the other hand may produce harmful substances, affect the growth of microorganisms.