The blistering of water-based coatings will affect the performance of the coating film and affect the effect of the coating film. Therefore, the coating must suppress its foam, and adding a defoamer is a good method. Good performance water-based paint defoamers can quickly solve the foam problem. This article analyzes the cause of paint foaming and gives a solution for defoaming.
(Picture: The role of water-based paint defoamer)
Cause analysis of paint blistering
Water-based coatings are prone to blistering due to the formulation or construction of the substrate.
1. Foaming caused by formula
Because the coating formulation contains surface active ingredients such as wetting agents and dispersing agents, it is easy to cause foam.
2. Improper surface treatment of substrate
Substances such as oxides and soluble salts on the surface of the substrate are the inducing points for coating blistering.
3. Residual solvents cause foaming
Inappropriate volatilization of solvents in some coatings can also cause solvent residues. If the coating itself is not firmly bonded, its water resistance will decrease, which will cause loss of adhesion and foaming of the coating.
For two-component polyurethane coatings, the air bubbles generated during the paint mixing have not disappeared, and the coating film has lost fluidity when the air bubbles overflow, and foaming will also occur at this time.
4. Residual gas on porous substrate
Solvents can also cause the coating film to foam on porous substrates such as cement and wood.
(Picture: Causes of paint blistering)
Water-based paint defoaming program
Water-based paint bubbles will affect the overall effect of construction and affect the aesthetics. Therefore, the coating system needs to defoam the foam, and adding a defoamer is a good solution.
Nanhui defoaming agent manufacturers are prone to foaming characteristics according to the formulation and construction characteristics of water-based paints. The water-based paint defoaming agent developed and designed is a type of compound paint defoaming agent. The dosage is small and the defoaming is obvious. Can eliminate large and small bubbles in the paint.
The water-based paint defoamer developed by Nanhui has the following advantages:
1. Insoluble in coating system;
2. Low surface tension and rapid defoaming;
3. The permeability coefficient is positive, and the spread coefficient is positive;
4. Strong stability and will not react with the coating system.
(Picture: Nanhui water-based paint defoamer provides free samples)
The defoaming principle of Nanhui water-based paint defoamer
1. Since the active component of the defoamer has a lower surface tension than the system, the permeability coefficient is positive. On the surface of the bubble, the defoamer droplet can penetrate the surfactant film on the stable shell and enter the bubble Inside the double layer.
2. Since the active component of the defoamer has a lower surface tension than the system, the spreading coefficient is positive, so the defoamer droplets have a high spreading tendency to expand the liquid/gas interface, and the defoamer Further spreading will reduce the thickness of the foam layer, and the change of stress will eventually lead to the rupture of the foam shell layer to achieve the effect of defoaming.
3. Due to the incompatibility between the defoamer and the system, the defoamer that penetrates into the foam film and spreads on the interface can push the surface active agent and the liquid in the double film layer away. When the thickness of the double film is lower than At the critical film thickness, the bubble bursts.
Nanhui is a manufacturer with years of application experience. It has far more defoaming technology than other antifoaming agents in the market. From the above cases, we prove the strength of our Nanhui defoamer. We have a group of excellent defoaming engineers, and an independent laboratory that facilitates defoaming experiments with foams that are difficult for customers to solve. If you want to know more about defoamer products, you can call our hotline: +86 13428601010.
This article is from the manufacturer of Nanhui defoamer (http://www.nhdefoamer.com/), please indicate the source if you need to reprint.
