In daily life, a large amount of foam will be produced when washing clothes, and substances with good foaming properties are called foaming agents. For example, some anionic surfactants such as sodium fatty acid, sodium alkyl benzene sulfonate, sodium alkyl sulfate, etc. have good foaming properties. foaming performance.

The direct cause of foam generation is that surfactants reduce the surface tension of the solution. Different foam systems show different stability. The main influencing factors include: foaming solution surface tension, foam surface viscosity, solution viscosity, and surface tension self-healing. (i.e. Gibbs surface elasticity and Ma-rangoni effect), electric double layer repulsion and entropic repulsion on the liquid film surface, hydrophobic end structure of surfactant and steric hindrance effect, etc.

How to eliminate foam caused by washing clothes?
Generally we use chemical methods, which mainly include chemical reaction methods and adding defoaming agents. The chemical reaction method refers to adding reagents to chemically react with the foaming agent to generate water-insoluble substances, thereby reducing the concentration of surfactants in the liquid film and causing the foam to burst. Since the composition of the foaming agent is uncertain, the chemical reaction method will produce insoluble substances, which have the disadvantage of easily remaining on clothes. The most widely used defoaming method at present is to add a defoaming agent. The advantages of this method are high foam breaking efficiency and easy use. However, finding a suitable and efficient defoaming agent is the key.

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