What are the steps in designing and developing defoamers?
There are many kinds of defoamers on the market at present, and their properties are different. The following is a brief introduction to the development process of defoamers. In the development process of defoamers, there are 4 key links:
Class I defoamers: chemical defoamers
It is mainly composed of various chemical substances, such as oleic acid, mineral oil, fat fluorobenzene, low alcohols and other chemical substances. It has little pollution to the environment and is cheap. At present, it is still widely used in the market. Because the defoaming and antifoaming properties are relatively poor, it cannot meet the production requirements of many foams.
Class III defoamers: polyether defoamers
The polyoxybutylene segment (EO) is a hydrophilic group; the polyoxypropylene segment (PO) is lipophilic. The defoamer has good defoaming and antifoaming properties, non-toxicity, non-irritation and good dispersibility. Defoamer Manufacturer In actual production, the relative content of polyether and the proportion of EO and po in the polyether segment are adjusted to meet the needs of various manufacturing industries. At present, the polyether defoamers on the market include linear polyethers, etheramines, fatty alcohol polyethers, oleic acid polyoxyethylene ethers and other polyether compounds.
The third defoamer: silicone defoamer
This type of agent has stronger defoaming and antifoaming properties than the first two defoamers. Because the use of silicone defoamers, there are many operating modes, generally polydimethylsiloxane, and some occasions also require silicones, such as ethyl, hydrocarbon, phenyl, etc. Dimethicone belongs to mdnm linear polymethylsiloxane, and its molecular structure is easy to bend the “yes” chain and molecular formula, which determines its following characteristics:
General working fluids and defoaming systems contain organic and inorganic substances, such as salts, alcohols, acids, alkalis, etc. These substances generally have demulsification effects. Defoamers are added to defoaming substances in small amounts, and the defoamers are completely in a new and different environment. If the defoamer is of low technical strength, and some general or problematic asphalt emulsifiers and asphalt emulsifiers are used, then this type of defoamer is easy to destroy the emulsion. If diluted with water, there will be low viscosity and asymmetry. After dilution, the mixing speed will be fast, which will also cause the emulsion to crack. The floating oil is as big as a needle, with a diameter of 0. Less than 1mm. Some of these oils selected are not easy to disperse for a long time, some will disperse after a period of time, and a thin layer of floating oil will form on the surface of the water, and some will even stick to the inner wall of the container filled with water dispersion liquid.
