Silicone oil defoamer is a kind of auxiliary agent, its function is to eliminate the foam formed by the material in the production process.Silicone defoaming agent is a kind of white viscous emulsion, its application field is also very wide, more and more attention from all walks of life.What is the deactivation mechanism of silicone oil defoamer?Xinjia to give you a summary. 

    Silicone oil defoaming agents generally include several different silicone oil, some of which are easier to leave the oil phase, dissolved into the micelles of surfactant molecules, so that the composition of the oil phase of the antifoaming agent dispersion changes, in order to reduce the activity of the antifoaming agent.

    Generally speaking, silicone oil with large molecular weight is insoluble in surfactant solvent, but commercial silicone oil often contains small molecules of silicone oil, which is easy to be solubilized by surfactant molecules, leading to the change in the composition of defoaming agent, and the ability to reduce defoaming.

    The formation of silicone oil layer on the foam film is the premise of defoaming, but in the process of defoaming, the silicone oil layer formed by the defoaming agent dispersion on the foam film will be slowly emulsified and then into the solution, making the defoaming performance is reduced.It can be said that the process of defoaming to deactivation is the spreading of the silicone oil layer on the foam film - the process of oil bridge formation/emulsification.

    When the silicone oil layer just began to enter the surface of the foam film, the spreading rate will increase, but with the process of defoaming silicone oil will continue to emulsify, the spreading rate will be reduced and the formation of oil bridge will be reduced, when there is no spreading silicone oil layer on the foam film, the defoaming agent is deactivated.

Silicone oil defoaming agent body as the active component of the hydrophobic solid particles in contact with the surfactant solution for a long time, will slowly detach from the defoaming agent dispersion and then into the solution.These lost silicon defoamer scattered experience as inserting resistance is too large to enter the bubble membrane surface, and some have entered the foam on the membranes of the silicone oil molecules are adsorbed onto the surface of the solid particles and then into the solution, cause the bubble defoaming agent on the membranes of the dispersions of hydrophobic drops, hydrophilic enhancement, finally makes the defoaming performance loss.

    When the silicone oil defoaming performance is deactivated, the working performance will also be affected.When we use silicone oil defoaming agent, we must pay attention to the performance protection of the defoaming agent and choose qualified and high-quality silicone oil defoaming agent.In addition to defoaming, silicone oil defoaming agent also has the advantages of low cost and no pollution of the material being defoaming.