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What are the functions of defoamers?
Release Date:
2022-10-31
There are many types of it; at the very least, this particularly crucial variety boasts a wealth of properties, making it an outstanding defoaming agent. First and foremost, it is a completely non‑toxic liquid, so you can use it without worrying about adverse health effects. Moreover, it has no distinct odor, ensuring a pleasant sensory experience, and it is entirely non‑toxic, causing no discomfort whatsoever.
There are many types of it; at the very least, this particularly crucial variety boasts a wealth of characteristics, making it an outstanding defoamer. First and foremost, it is a completely non‑toxic liquid, so you can use it without worrying about adverse health effects. Moreover, it has no distinct odor, ensuring a pleasant sensory experience, and it is entirely non‑toxic, causing no discomfort whatsoever.
When polyether antifoams are added to water, they disperse rapidly, which is why they are widely used not only in conventional industries but also deliver exceptionally strong performance in many other manufacturing sectors. In industries such as food processing and fermentation, as well as in cosmetics and pharmaceutical production, their effectiveness far surpasses that of other antifoaming agents; silicone‑based antifoams, by comparison, exhibit significantly lower efficacy.
Typically, polyether defoamers are synthesized from a variety of different end‑group compounds, and these base compounds serve as the basis for classifying polyether defoamers. Depending on their structure, polyether defoamers can be categorized into polyol‑type, oleate‑type, and amine‑ether‑type; each type exhibits distinct characteristics. Among these, polyol‑type and oleate‑type defoamers are the most widely used today and play crucial roles across numerous industries.
Compared with methyl silicone‑based defoamers, polyether defoamers are more widely used; however, in terms of performance, they also have certain limitations. Consequently, current research has shifted toward innovative design approaches, enabling the development of novel polyether formulations that can endow polyether defoamers with even superior properties. In short, polyether defoamers are characterized by a highly distinctive block architecture and well‑defined segmental spacing.
A series of experiments demonstrates that adding cutting oil significantly reduces the surface tension of water. When the concentration exceeds 1.60%, the interfacial tension decreases—specifically, by 1.9%. As the curve reveals, cutting oil behaves like a surfactant: once its concentration surpasses 1.68% (by weight), a large number of surface‑active substances accumulate at the liquid–gas interface, forming a monolayer film that brings the system’s surface tension to an optimal level. These surface‑active agents possess an amphiphilic structure—hydrophilic on one end and lipophilic on the other—making them prone to foam formation. In practice, when cutting oil is used at concentrations exceeding this threshold, the aqueous solution contains substantial amounts of such surface‑active compounds; during precision machining, as the oil circulates and comes into contact with abundant air, bubbles are generated. The surfactants in the cutting oil then selectively adsorb at the gas–liquid interface, creating a stabilizing film that keeps the foam persistently intact. As the machining process continues, the advantages of using a conventional defoaming agent become increasingly apparent. From the widespread adoption of these products, it is clear that wastewater‑treatment defoamers effectively deliver tangible benefits and cost‑effective solutions for users. Typically, conventional defoamers exhibit notable drawbacks: first, they can severely impair emulsion breaking, leading to cascading losses; second, if their emulsion‑breaking efficiency is poor, the rate of demulsification will fail to meet the performance standards expected of such agents.
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