Common problems of water based paint: causes of shrinkage and solutions

Shrinkage, known as cratering, is a common problem with water-based paints。The main cause of shrinkage cavity is impurities in water-based paint. In particular, there is oil in the area where the shrinkage cavity occurs, making the area unable to be wetted.In practical operation, the main causes of shrinkage cavity are as follows:

1.The substrate is contaminated with oil or impurities

2.Apply a paint to the old paint or finish without sanding

3.The construction interval between the two paints is too long

4. Too much defoamer in the paint

The difference in surface tension is the main cause of the formation of shrinkage cavities. Low viscosity of the coating is conducive to the flow of the coating, and low thixotropy increases the flow time of the coating. Not conducive to the control of shrinkage holes.Therefore, reducing the source of shrinkage cavities which cause a difference in the surface tension of the coating, improving the viscosity of the coating and improving the thixotropy are all favorable for resisting the formation of shrinkage cavities.Specifically, the shrinkage cavity can be reduced from the following aspects:

1.Thoroughly polish and clean the substrate, and seal it with shellac if necessary

2.Shorten the interval and polish the surface to be painted

3.Add leveling agent appropriately

4.Check the compatibility between the antifoaming agent and the system, and choose the defoaming agent with good compatibility

5.Use a hydrophobic dispersant in combination with a high molecular weight thickener, and appropriately add an antifoaming agent to prevent agitation and foaming.

Sinograce Chemical production of water based paint chemical additives, such as defoaming agent, thickening agent, leveling agent, wetting agent, welcome to consult, there will be professional recommended for you.

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