Foam is a bubble that is a dispersion system with a gas/liquid, gas/solid, gas/liquid/solid interface. This form refers to the presence of insoluble gases in liquids or solids, or in separate bubbles surrounded by their membranes ( Bubble). A state in which a plurality of bubbles gather together and is separated from each other by a film is called a foam. Foam also has a wide range of uses in people's production and life: like flotation, fire fighting, dusting, washing, making foam ceramics and plastics; sometimes it needs to be eliminated, such as fermentation, coatings, paper, printing and dyeing, removing body flatulence, boiler water, Wastewater treatment and the manufacture of prisms (or glass).
The surface and the inside are uniform pure water and the pure surfactant does not blister, and it is difficult to form an elastic film, and even if it is unstable, it will disappear instantly. However, there is a surfactant in the solution. After the bubble is formed, the hydrophilic group and the hydrophobic group in the molecule are adsorbed by the bubble wall due to the intermolecular force, forming a regular arrangement, and the hydrophilic group faces the water phase, and is hydrophobic. The base faces the inside of the bubble, thereby forming an elastic film at the bubble interface, which is highly stable and is not easily broken under normal conditions. The stability of the foam is related to surface tack and elasticity, electrical repellency, movement of the surface film, temperature, evaporation and the like. Furthermore, the bubble is inversely related to the surface tension of the liquid, and the smaller the tension, the easier it is to foam. In life and production, sometimes the emergence of bubbles has caused many inconveniences to people, so it is necessary to defoam.
Any factor that can destroy the stability of the foam can be used for defoaming. Defoaming covers the two factors of "bubbling" and "breaking". Silicone defoamers provide this function, which reduces the surface tension of water, solutions, suspensions, etc., prevents the formation of foam, or reduces the original foam, usually with a selective effect. The general physical defoaming method is difficult to defoam instantaneously, while the chemical and interface defoaming is very fast, convenient and efficient.
In summary, an antifoaming agent refers to an agent having chemical and interfacial chemical defoaming action. Examples of the antifoaming agent include low alcohols, mineral oils, organic polar compounds, and silicone resins. The form is oil type, solution type, emulsion type, foam type. As defoamer, it has strong defoaming ability, stable chemical stability, physiological inertness, heat resistance, oxygen resistance, corrosion resistance, dissolved gas, gas permeability, easy diffusion, easy to penetrate, insoluble in defoaming system and irrational influence. The foaming agent is used in a small amount and high efficiency.
Defoamers are available in a wide variety of applications. The antifoaming agent "bubble" and "breaking foam" process is: when the system is added with antifoaming agent, its molecules are disorderly spread on the surface of the liquid, inhibiting the formation of elastic film, that is, terminating the generation of foam. When the system produces a large amount of foam, the defoaming agent is added, and the molecules are immediately dispersed on the surface of the foam, rapidly spreading, forming a very thin double film layer, further diffusing, infiltrating, and layering intrusion, thereby replacing the thin wall of the original bubble film. Because of its low surface tension, it flows to the liquid with high surface tension of foam, so that the low surface tension defoamer molecules diffuse and penetrate between the gas-liquid interface, and the membrane wall is rapidly thinned, and the foam is simultaneously affected by the surrounding surface. The film with a large tension is strongly drawn, so that the stress around the foam is unbalanced, causing it to "break". The defoamer molecules that are insoluble in the system re-enter the surface of the other foam film, and so on, all the foams are completely destroyed.
Author: Kim Jin Plastic Co., Ltd., Dongguan City,
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