There are many kinds of defoaming agents, organosiloxane, polyether, silicon and ether grafted, containing amine, imine and amide, with faster defoaming speed, longer foam suppression time, a wider range of applicable media, and even harsh medium environment such as high temperature, strong acid and strong alkali characteristics. Widely used to remove latex, textile sizing, food fermentation, biological medicine, coating, petrochemical, papermaking, industrial cleaning and other industries in the production process of harmful foam. Any factor that can destroy the stability of foam can be used for defoaming. Defoaming includes two factors: "suppressing bubbles" and "breaking bubbles". Silicone defoaming agent is given this function, it can reduce the surface tension of water, solution, suspension, etc., prevent the formation of foam, or reduce the original foam, usually has a selective effect. General physical defoaming method is difficult to defoaming instantaneously, while chemical and interface defoaming are very fast, convenient and efficient. In a word, defoaming agent refers to a chemical and interface chemical defoaming agent. As defoaming agent, low carbon alcohol, mineral oil, organic polar compounds and silicone resins. Its form has oil, solution, emulsion, foam. As defoaming agent, it has the characteristics of strong defoaming force, stable chemical properties, physiological inertia, heat resistance, oxygen resistance, corrosion resistance, gas dissolution, air permeability, easy diffusion, easy penetration, difficult to dissolve in defoaming system and no physical and chemical effects, less amount of defoaming agent, high efficiency and so on. Defoaming agents are of various varieties and widely used. The process of "inhibiting foam" and "breaking foam" of antifoam agent is: when the system is added with antifoam agent, its molecules are scattered desultorily on the liquid surface, which inhibits the formation of elastic film and terminates the generation of foam. When a large amount of foam is produced in the system, the antifoam agent is added, and the molecules are immediately dispersed on the surface of the foam, quickly spread out, forming a very thin double film layer, further diffusion, infiltration, layered invasion, thus replacing the original bubble membrane thin wall. Because of its low surface tension, high surface tension of the liquid flow to generate foam, such low surface tension of defoaming agent molecules at the gas-liquid interface between continuous diffusion, osmosis, make its membrane wall thinning, rapidly around the bubble at the same time by large surface tension membrane layer strong traction, so that the stress around the bubble imbalance, resulting in the "bubble". The defoamer molecules, which are insoluble in the system, re-enter the surface of another foam film, and so on, and all the bubbles are destroyed.

Notes on the use of silicone defoaming agent

1, should adopt a large number of, repeated criteria to add defoaming agent.

2. This product can also be heated and sterilized into the tank with raw liquid and fermentation base material, or it can also be used to prepare the water emulsion after indirect steam sterilization and "flow" into the tank for defoaming.

When inorganic silicon defoaming agent is being applied or sampled, adequate stir VAE emulsions are required.

A. Water bag type emulsion can be arbitrarily concentrated, but the stability of simultaneous emulsion will thus fall sharply, such as stratification and other scenes;

B. During concentration, please withdraw the water from the defoaming agent and stir it rapidly;

C. Because the emulsion is best stable at the original depth, because the concentrated emulsion must be shaved in a short period of time;

D. Emulsions are insensitive to ketone freezing and are susceptible to damage when measured above 40°C;

E. Frost prevention. Once frozen emulsions can remove frost in small cores, but must be tested before further application; F. Short time of intense oscillation or intense shear (such as the use of machine pumps, homogenizers, etc.) or stirring will destroy the stability of the emulsion;

G. Improving the viscosity of the emulsion or adding thickeners can improve the stability of the emulsion.