What is defoaming agent?
Lencolo
2022-07-19
628
It is divided into antifoaming agent and antifoaming agent. Foam suppressor is mainly to control the generation of foam and will produce the foam elimination, mostly in the paint production and use process play a role; Bubble breaking agent is mainly produced by small bubbles from small to large, so that the bubble film gradually thin and their own bubble breaking, such additives in the whole process of coating play a role.
First, the generation of bubbles:
1, the presence of surfactant
2. Chemical reactions create bubbles
3. The air in the porous substrate overflows from inside the coating film
Two, defoaming mechanism:
Defoaming agent produces stable surface tension imbalance in foam system, which destroys surface viscosity and surface elasticity of foam system. Bubble breaking is divided into three processes: bubble redistribution, film thinning and film rupture.
Three, the application conditions of defoaming agent:
1, defoaming agent surface tension is less than the surface tension of the coating
2. The smaller the solvent solubility of defoaming agent, the better.
3, defoaming agent in the coating to have good dispersity
4, defoaming agent should not react with the composition of the paint.
5, defoaming agent should have a higher permeability, diffusion coefficient.
6, defoaming agent does not affect the final product performance
7, defoaming agent should not smell
8. Pay attention to the choice of price and performance
Four, the main types of defoaming agent:
Silicone system defoaming agent
Non - silicon defoaming agent
Fluorine modified defoamer
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