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Jan 11, 2018
In the process of industrial production, if a large number of bubbles exist, it will bring a lot of troubles to the production process, for example, the production capacity will be greatly restricted; the waste of raw materials and products will be caused; the quality of products will be affected; the environment will be polluted, So if it can not be properly resolved, it is no exaggeration to say that the "bubble" will become our stumbling block and become a "bottleneck" in some processes. Therefore, in the production process how to effectively control the foam has become the focus of the researchers! In fact, a lot of foam can be eliminated by defoamers. Defoamers generally eliminate foam by either of the following two methods. 1. Defoamers spread in the foam, the proliferation of double-layer membrane formed in the foam wall, in the process of diffusion will stabilize the role of the surfactant row, and reduce the surface tension of the foam to destroy the foam self-healing Effect, the bubble burst. 2. Defoamers may enter the foam wall, but only to a very limited extent, together with the blowing agent to form a mixed monolayer. If the cohesion of such a monolayer is poor, the foam will rupture. Defoamers commonly used in industry generally can be divided into organic defoamers, silicone defoamers and polyether defoamers and other three categories. Among them, silicone defoamers are more and more popular due to their strong defoaming ability, low concentration and little toxicity to human and environment. Silicone defoamer made of silicone and SiO2 by a certain percentage of composite. The defoamers thus prepared are water-insoluble, rather hard to emulsify, have low surface viscosities, lower surface tension than some surfactants, and can interfere with the surface elasticity of the foam film and the like, and are particularly effective in defoaming the oil-soluble solution Good; modified composite silicone antifoaming emulsion diffusivity, antifoaming ability and better performance. At home and abroad are mostly used in such defoamers.