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Home  > Forum  > Coatings & raw material failures  > Roughness in paint

Tuesday, 22 May 2018

Roughness in paint

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Wednesday 15 September 2004 1:00:00 am

Roughness in paint after storage in distempers with pvc of 78 - 80 and extenders used are of best quality fine extenders.

But roughness and bittiness tends to appear after sometime upon storage. Could I get the reason for this problem? It is occuring randomly.

The dispersants used are sodium salt of poly acrylate and ep 5. Sodium hexa meta phosphate is also used.tds of water used is less than 20.
Could it be because of a heat shock or stirring shock? Because of which this problem is occuring? Has anybody a personal experience?

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Monday 20 September 2004 1:00:00 am

Your problem is very specific and would need some specific descriptions of your materials and process. However, look closely at the oil absorption values of your extender. Your PVC is very high and you mentioned you are using FINE extenders. In storage, fillers and extenders continue absorption and you may have reached the maximum limit. I cannot say if your dispersing agents are suitable without knowing the resins and extenders you use. You also need a wetting AND dispersing agent (separate or multifunctional)to ensure that the extenders are properly incorporated. Allow also good processing time and consistent time everytime when adding your extenders.

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