They are good, anti-foam

Posted by draken on April 4th, 2023

Bubbles are what form when large amounts of gas are released from a liquid because, at low density, they float to the surface where the bubbles coalesce and become separate gas particles in the liquid membrane. soft separated. head" and a glass of beer. Foam causes major problems in manufacturing processes and processing and is controlled by using defoamers. Examples of these methods include the use of defoamer in diesel fuel, if there is no defoamer, the fuel pump will cause cavitation and foam, causing the inability to pump liquid, and since diesel fuel pumping the pump itself. , the final destruction of the redemption; In the same way, mixing the powder that is separated into a liquid carrier is a precision molding process, which is injected into the air and sometimes onto the foam. Liquids containing foam usually exhibit high viscosity and thixotropic rheology, causing the density and air to decrease, and the foam itself is usually hard and often hard to the hand. Therefore, we should not be surprised that the presence of entrained air or the presence of surface "bubble" causes many problems in all surface coating systems and indeed in PIC and similar factories. The physics of foam formation is relatively simple and is based on the creation of voids that are stretched by surface tension and friction. But the foam's stability, instability, and process of breaking are a simple matter of the surface effect, polarity, and (my new word of the week) the Marangoni effect. I don't want to explain it in depth, suffice it to say that the account is very simple, and explained very well and clearly in Wikipedia. I recommend you to search the article "Foam".

What is a Defoamer?

The word defoamer or defoamer is often used interchangeably in the industry or industry, here I will consider it as the same word, but semantically defoamer is often used to break foam is real, and the defoamer prevents it from happening. be First in this blog I will not distinguish between the two, but it is different for 'vaults' as they say.

How does it work?

In general, a defoamer is insoluble in the foaming medium and has surfactant properties, i.e. It is a surfactant, as discussed last week, but it has three main properties:

low viscosity

Ability to quickly spread over foam. The flow of the air-water interface that destroys the air-water air of the foam.

The last sentence is very good, but it means that it causes a small bubble to burst into a larger, weaker bubble, which breaks again and breaks the bottom of the top. The attached air bubbles likewise coalesce into larger bubbles that are more turbulent, and the larger bubbles rise more quickly to the surface of the larger liquid, where they can spread.

What are they made of?

At that time, 1-Ethylhexanol, 2-Ethylhexanol, 2-Ethylhexanol is a very rich alcohol, which is rarely in water, is small and volatile. They are still used today for A

antifoam