Detection and use of silicone defoamers
In the actual industrial production field, different types of defoamers are very frequently used pharmaceutical products, and to a certain extent, they are also the most powerful guarantee for the normal progress of industrial production. However, there are many types of defoamers in the field of industrial production, and these different types of defoamer products are also widely used in actual applications. Users must learn to detect and use them correctly. The following is a detailed introduction by industry experts taking silicone defoamer products as an example.
In fact, the most direct reason why defoamers are widely used in the production and life fields is that they are guided by actual needs. In the process of making foam ceramics and plastics in life production, such as flotation, fire extinguishing, dust removal, washing, sometimes it is necessary to eliminate the bubble substances generated in the manufacturing process. These bubbles are non-gas-intolerant substances that exist in industrial production liquids or solids. They are substances that exist independently on the surface of the film. Common ones are oily bubbles and water-based bubbles. In this regard, it is necessary to add a certain amount of water-based defoamer or silicone defoamer.
Usually, in the actual use of silicone defoamers, they should have a defoaming and suppressing effect on foam, that is, it can quickly destroy the foam while also suppressing the generation of foam for a long time. When using, we often find that the defoamer loses its effectiveness after being added to the solution for a while, and it is necessary to continue to add the defoamer to prevent the formation of foam.
According to experts in the professional research and development of defoamers, the reason for this situation may be that the critical micelle cmc concentration of the surfactant in the solution exceeds. In the solution exceeding cmc, the defoamer may not be solubilized, so that it loses its surface spreading effect, and the defoaming effect decreases. Therefore, when adding the defoamer, continue to add the defoamer as the defoaming effect decreases.
Organic silicon defoamers do not mean that as long as they can inhibit foam or prevent foam generation, they are real defoamers. Real defoamers need to be tested in many aspects. The following is an introduction to the specific test items:
The performance of organic silicon defoamers that need to be tested mainly includes defoaming rate, defoaming ability, foam suppression ability, storage stability, water solubility, acid and alkali resistance, physiological toxicity, high temperature resistance and optimal usage. Usually the most important are defoaming performance and foam suppression performance, and different industries have different performance requirements for defoamers.
Different performances of silicone defoamers require different test methods, but there are many ways to test defoaming and foam suppression, and any defoamer must be tested. The most commonly used test methods are West German Industrial Standard Method, Air Blowing Method, Air Blowing Method, Titration Method, etc. In terms of the defoaming effect, factors that can break and suppress the growth of foam can be used for defoaming.
Usually, in order to prevent the formation of foam, foam is needed in the early stage of production to achieve the defoaming effect. Bubbles and surface tension are negatively correlated. To reduce surface tension, chemical defoaming is generally more appropriate and quick, and defoamers are important auxiliary agents in chemical defoaming. There are many varieties of defoamers and a wide range of uses. Most of the defoamers that suppress foam on the market are added after the production of foam to spread it on the foam surface.
After spreading on the surface, a double film is formed, and the principle of diffusion and penetration replaces the original bubble film to achieve the defoaming effect.
