In industry, if the foam problem does not take the correct method, it will be very difficult to deal with, then you can try defoaming agent for defoaming, not only the operation is simple, but also the effect is obvious. Next, let’s dig deeper into Silicone Defoamers to see how many details you have overlooked.
During the production and use of coatings, foam problems often occur. If the shares are not eliminated in time, the fluidity of the coating will be affected, resulting in surface defects, unevenness, and cracking during film formation, which will eventually lead to increased production costs. , so we must use a cost-effective method to solve this problem in order to recover the loss.
There are many kinds of defoamers, including mineral oil, silicone, and polyether, etc., which have many advantages such as self-emulsification, easy dispersion, strong versatility, good defoaming, and long-lasting foam suppression. All in one, it will not affect the film-forming properties after use, and will not cause defects on the surface of the paint, especially for water-based paint systems.
The amount of defoaming agent is very small, only one thousandth to three thousandths can achieve obvious defoaming effect, so it is widely used in water-based coatings, inks, inks, varnishes, leather edge oils, papermaking, coating , laminating glue, latex paint, adhesives and other fields.
At present, for the foam problem, the following three methods are usually used for defoaming.
1. Mechanical defoaming method
Mechanical defoaming is generally used in situations where heating is required to cause product deterioration and foam separation, such as under rapid pressure changes, centrifugal separation of solutions and foams, spraying foam systems with compressed air, ultrasonic filtration, etc.
2. Physical defoaming method
Generally speaking, physical defoaming mainly adopts the method of changing temperature to defoam and suppress foam. As the temperature increases, the viscosity of the solution decreases and the solvent evaporates, causing the foam to collapse. When the temperature decreases, the surface elasticity of the foam decreases, and the low temperature causes icing, which destabilizes the structure of the foam and causes the foam to burst.
3. Chemical defoaming method
The chemical defoaming method mainly relies on the addition of silicone defoaming agent, which is a convenient and effective defoaming and antifoaming method among the three methods. It mainly depends on changing the pH value, salting out, and changing the chemical reaction of the foam. The principle is that after the defoaming agent is added to the defoaming agent, the defoaming molecules will be randomly distributed on the surface of the liquid, spread out quickly, and form a thin double-layer film, which will further diffuse, penetrate, and invade in layers, gradually Replace the thin wall of the original foam, hinder the formation of elastic film, destroy the self-healing ability of the foam, and make the foam burst.
According to different scenarios and different defoaming requirements, choose the defoaming method and defoaming agent that suit you. We can provide you with the most suitable defoamer for you, welcome to buy.
Post time: Feb-22-2023