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What are the defoamers that can be used in machine washable dishwashing detergent formulations?

Experiments with the actual use of antifoam need to be separated, nowadays dishwashers are mostly washed by jetting, foam can make the pump less efficient and reduce the water pressure of the jetting liquid. In addition, the foam will form an uneven film of water on the dishes, leaving water stains or streaks after drying, affecting the stain removal effect. This phenomenon is particularly noticeable with glassware. Therefore, the surfactant used for the catalytic drying agent is usually a nonionic low-foaming surfactant. The main ones are fatty alcohol alkoxylates, capped alcohol ethers, and polyoxyethylene/polyoxypropylene block copolymers (especially trans-block or random block).

Foam control can be achieved when the temperature exceeds the cloud point of the surfactant. In order to balance the wetting and foaming effects, this is often achieved by combining two or more low-foaming surfactants: the surfactant with a slightly higher cloud point acts as the wetting agent, while the surfactant with a lower cloud point mainly exerts a foaming effect. Adding the appropriate antifoam agent is enough. In practice, there are many factors to control foam.

Anti-foaming agents can sometimes be added to the formulation in order to further reduce the foam in automatic dishwashers. Commonly used in automatic dishwashing detergents are phosphate dibasic, silicone oil, etc., of which the former is used more.

General silicone oil defoamer used more, the specific labeling of everyone is imitation of a big brand, directly find your familiar silicone oil manufacturers, find them to detergent in the solubility of good silicone oil defoamer can be, and some may affect the translucency of the product to a certain extent, the price of the fully transparent is high.

Why do you need to add additional defoamer to the detergent, if the surface activity content is lowered, the foam will be reduced?

Defoamer improves rinsability and reduces the foam to less than the surface activity, and the cleaning power is weaker.

Hand wash detergent rarely need to add defoamer, basically do not add, because the evaluation method of the national standard is based on the foam persistence to determine whether it is qualified. Machine washing will directly choose low-foaming table living.

Defoamer to improve easy rinsing, reduced to the surface activity of the foam to become less, cleaning power is also weak.

Will the addition of defoamer affect the degreasing and emulsifying performance of degreasing agent, because defoamer will affect other surface active performance?

The main reason for the foam is due to the presence of surface-active substances, which are good foaming agents with foaming characteristics, which will lead to a large number of foams in the process of use. Cleaning agent defoamer dosage is small, high content, a small amount of additive can effectively eliminate a large number of foam in the washing powder, foam suppression effect is good; chemical properties are stable, added to the washing powder will not affect its basic properties and quality, will not affect the subsequent cleaning effect, will not be chemically reactive with it.

Put mineral oil, emulsifier, gas silicon, heating treatment, the product can only inhibit foam, not defoaming. What is the problem?

These things increase the interfacial tension, affecting the foaming, and defoaming needs to destroy the foam.

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