Deepen the defoaming field, assist in efficient production, and provide one-stop foam solutions
Welcome to Nanjing Golden Key Biotechnology Co., Ltd.!
What are the production standards for defoamers set by defoamer manufacturers?
Release Date:
2020-12-11
Defoamer manufacturers explain that defoamers are not chemical substances that dissolve polyurethane foaming agents; rather, they can be dispersed into polyurethane foams in the form of liquids, encapsulated liquid particles, or liquid‑laden particles. Defoamers have a lower interfacial tension than the foam‑forming medium, allowing them to spontaneously penetrate the liquid film and induce bubble rupture. They readily spread across the aqueous surface and automatically distribute themselves at the foam interface. By carrying away successive layers of solution from the adjacent surface, they thin the liquid film until it reaches a critical thickness. As the liquid film ruptures, the foam collapses. The faster a defoamer spreads on the aqueous surface—resulting in progressively thinner films—the more rapidly the foam is destroyed, and the stronger its defoaming effect becomes. Thus, the reason for defoaming lies not only in its ease of spreading but also in the adsorption of defoamer molecules, which replace the surfactant molecules in the foam and create a membrane with reduced mechanical strength. Simultaneously, during the spreading process, portions of the surrounding solution are drawn away, further thinning the foam film, diminishing its structural integrity, and making the foam more susceptible to breakdown.
Defoamer manufacturer Let me explain: a defoamer is not a chemical that dissolves polyurethane foam; rather, it can be dispersed into the polyurethane foam either as a liquid or as an encapsulated liquid particle, or as a liquid containing dispersed particles. The defoamer has a lower interfacial tension than the foaming substance, allowing it to spontaneously penetrate the liquid film and induce bubble rupture. Defoamers readily spread across the aqueous surface and automatically distribute themselves at the foam–liquid interface. They carry away successive layers of solution from the adjacent surface, thinning the liquid film until it reaches a critical thickness. As the liquid film ruptures, the foam breaks apart. The faster the defoamer spreads on the aqueous surface, the thinner the liquid film becomes, the quicker the foam is destroyed, and the more pronounced the defoaming effect. Thus, the reason for defoaming lies not only in its ability to spread but also in its capacity to adsorb—defoamer molecules replace the surfactant molecules in the foam, forming a membrane with reduced mechanical strength. Simultaneously, during spreading, portions of the solution from the adjacent surface are removed, further weakening the foam’s liquid film, reducing its structural integrity, and making the foam more susceptible to breakdown.
Such a defoamer must simultaneously exhibit both defoaming and foam‑suppressing effects; in other words, it should not only rapidly break down foam but also prevent its re‑formation over time. This is likely related to whether the critical micelle concentration of the foaming agent (surfactant) in the aqueous solution has been exceeded. Beyond aqueous solutions, defoamers—typically organic liquids—can dissolve, thereby losing their ability to spread at the interface and significantly diminishing their effectiveness. Over time, as the defoamer gradually dissolves, its foam‑suppressing performance correspondingly declines.
Defoamer manufacturer Here are the various ingredients and functions of defoamers.
Defoamers typically consist of multiple components with distinct functions, namely: primary defoaming agents, auxiliary defoaming agents, polymeric carriers, asphalt emulsifiers or developers, and thickeners or composite additives.
(1) Key defoaming agents: These are specialized ingredients, typically insoluble particulate compounds such as hydrophobic silica, fatty amines, and paraffin wax. They are often formulated with methyl silicone oil.
(2) Auxiliary antifoaming agents: These are specific ingredients that provide a buffering effect, enhance the surface performance of the primary antifoaming agent, and exhibit a synergistic effect with it. Examples include fatty alcohols and oleate esters.
(3) Plasmid vector: Water serves as a convenient and cost-effective carrier for both the primary antifoam agent and the auxiliary antifoam agent.
Previous page
Previous page
Domestic Business Department
13770937137(Ms. Ge)
No. 5, Lingxiao Road, Lukou Subdistrict, Jiangning District, Nanjing City
Foreign Trade Department