In industrial production, many harmful foams are often generated, which, if not treated in time, can cause capacity limitations, waste of raw materials, longer production cycles, inaccurate measurement, environmental impact and other problems. In order to deal with the situation, in addition to the use of physical defoaming method, more use to add defoamer to deal with. Water-based defoamer defoaming speed, long foam inhibition time, chemical stability, a wide range of good characteristics, widely used in petrochemical, metal processing fluid, sewage treatment, fermentation, paper and other fields. We usually contact or understand the water-based defoamer, a wide variety of different numbers, but it is likely to be a small part of the family of water-based defoamer, the following we comb for the basics of water-based defoamer, to facilitate the future work life, improve the ability to identify and deepen product understanding.
First of all, due to the wide application of water-based defoamer, in the process of application in various fields, for ease of transport, storage, ease of use and other reasons, defoamer mainly presents the following four forms: 1, oil type Mostly seen as pure silicone products, such as polyether modified silicone oil or the introduction of other functional groups of modified silicone oil, or diluted with organic solvents, generally higher cost of direct use, the effect is poor or due to the presence of solvents affect the environment; 2, oily paste The appearance of paste, similar to grease paste, easy to transport, easy to store, relatively speaking, when put need to dilute or add after the phase; 3, dispersion type powdered very small body points dispersed in insoluble carrier; 4, emulsion type presents a milky white viscous liquid, is the most used in various industries, the most widely used products, generally for the compounding type products; 5, solid or powder type presents solid, flaky or powder, mostly in the food or water treatment, processing difficulties and placement requirements are more demanding; Secondly, water-based defoamers can be divided into natural oils and fats, polyethers, silicones (tree esters, modified silicone oil, silicone oil, etc.), high-carbon alcohols, fatty acids and derivatives based on the structure and composition
Again, in order to strengthen the water-based defoamer a certain function or dedicated in a specific process, water-based defoamer can be divided into alkali-resistant, acid-resistant, high viscosity, cationic, etc., see the following chart for details.
In addition, about the water-based defoamer, based on the use of various defoaming substances before and after the time, and divided into the first generation of defoamer (mineral oil, amide, low alcohol, fatty acid esters, phosphate esters, etc.), the second generation of defoamer (polyether class), the third class of defoamer (silicone class), the specific time point of the division is no longer presented.
In summary, we briefly sorted out the various classifications of water-based defoamer, here, please readers in the mind of the various classifications to arrange a combination, analysis of which combinations have cross, which combinations are purely seamless merger, because only the combination of some classifications in one piece, is more conducive to the identification of the market defoaming products.
After the classification of water-based defoamer, the next combing water-based defoamer other knowledge. In addition to a few pure material products on sale, the market is mostly seen products are compounded, the reason is actually relatively simple, defoaming itself from the perspective of the principle of action can be subdivided into bubble breaking, foam inhibition, defoaming three effects, a single substance often does not have all the functions, or there are difficult to enter, slow diffusion, poor spreading and other defects, compounding both to solve the problem, but also to avoid the complex chemical reaction.
Then, we follow the above ideas, discuss the defoaming product compounding needs to consider several points of focus: 1, volatility can not be too strong, otherwise the action time will be greatly shortened; 2, neither too affinity to the foaming medium, nor completely insoluble, otherwise the addition is too large or easy to separate; 3, surface tension needs to be lower than the foaming medium; 4, can not react with the foaming medium, chemical stability is good; 5, need to meet the foaming medium of the whole process, can not be in the process of rising / falling temperature, rising / falling pressure, PH value changes in the short-term failure; 6, need to have other required matters, such as storage of short-term non-separation settlement, high efficiency of defoaming, good dispersion, etc..
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