Formulation design system for waterborne coatings - defoaming agent and defoaming agent 2

2019-07-11

Types of defoaming agents

Character

Application

Mineral oil

Strong anti-bubble ability

Low price

Poor system compatibility

Easy migration

Primer

Matte

Organic silicon class

Strong defoaming ability

higher price

Different product performance differences

Large adjustment space

Improper selection can cause film defects

Influence gloss, flow equality

Various coatings

Non-silicone non-oil

Good security

Low probability of defects

Does not affect the gloss

But the amount is slightly larger

Insufficient bubble breaking ability

higher cost

Various types of coatings, especially in high gloss finishes


There are many defoamers on the market, and the choices are very cautious and can be noted in several ways:

1. Controlled compatibility, that is, to achieve the balance between defoaming and surface effects, both defoaming and prevention of defects such as shrinkage cavities and poor leveling.

2. Defoaming according to the construction conditions and methods, such as brushing, spraying and roller coating, face different degrees of foaming, and also means different defoaming agents.

3. The balance between foam suppression and foam breaking can be reasonably matched according to different processing and construction methods.

4. Long-term defoaming performance. Many defoamers will gradually reduce their defoaming performance during storage of the paint, and the antifoaming agent content in the paint should be higher when designing the formula.

The amount of defoaming agent is 0.05% to 0.5% of the whole formulation, preferably about 0.1%. If the defoaming agent used exceeds 0.5% to have a good defoaming effect, the defoaming agent should be considered.Different resin systems are sensitive to defoamers. The type and amount of aqueous defoamer selected must be determined experimentally, depending on the system.

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