Elimination mechanism and application of foaming agent-Iota

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Service > Elimination mechanism and application of foaming agent

Elimination mechanism and application of foaming agent

Elimination mechanism of foaming agent

Defoaming agent into double membrane molecular orientation in the foam, mechanical damageand achieve balance oriented film defoaming or defoaming purpose.

Defoaming agent and foaming agent to react with the chemical reaction method, such as foam soap,adding acid to turn stearic acid, can also add calcium, magnesium and other metal ions, which leads to the formation of stearic acid salt is insoluble in water, thus leading to the breakdown of the bubble disappear.

The decrease in the membrane strength method defoaming agent for non polar solvent such as kerosene, gasoline, diesel oil, etc.. These organic hydrocarbons on the surface of the liquid can be quickly spread, take away part of the foaming agent, the film thinning and rupture strength decreased. The antifoaming agent must be emulsified before application in papermaking, orkerosene will pollute the fiber.

Most of defoaming agent of alcohols using small molecules, such as ethanol, alcohol, they can enter the bubble Double molecular orientation in the membrane, the membrane strength decreased, andthe diffusion of these polar molecules to foam molecules into the water, leading to the bubble burst.

The resulting local tension difference can significantly reduce the surface tension of the surfactant and the hydrophobic solid particles, such as fluorinated surfactants, silicone oil, polyether, highcarbon alcohol, colloidal silica, two stearyl ethylenediamine (EBS) to enter the bubble bilayer membrane, causing membrane surface tension in local decreased, while the rest of the film it still maintains a high surface tension, the tension between the strong tension traction this tension is if the part, which leads to the bursting of the bubble.

Application of defoaming agent

The alkaline pulping process, will produce a large amount of foam, then add defoaming agent mainly for polyether, fatty acid esters.

Defoaming agent general for emulsion added wet process, surfactant and hydrocarbon compound,with double stearic acid amide, stearic acid polyoxyethylene ester defoaming effect.