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Monday, 23 September 2019

paint chemistry 101

2 Posts

Thursday 20 August 1998 1:00:00 am

What does the plasticizer do? (TXIB)
How will increasing the amount harm
the coating.

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Friday 18 September 1998 1:00:00 am

Plasticisers are usually non-film-forming products which are much softer than average paint films. When incorporated into paint formulations they remain in the film as it dries (because of their low volatility). In emulsion paints they help in film formation, acting in the same way as coalescent solvents.
Their main effect is on the dry film, making it softer and more flexible. This can help prevent cracking in thick films or over mobile substrates. Durability is improved by reducing the stresses acting on the coating. However, you should bear in mind that using too much plasticiser can make the film so soft that it becomes permanently tacky. This will lead to increased dirt pick-up so that the film appearance is affected. Also too high a level of plasticisers can interfere with binder performance and reduce the durability, wash resistance and abrasion performance of coatings. You should also avoid putting plasticisers into coatings which need hard films such as gloss paints, floor paints etc. as again they will reduce the binder performance.

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Tuesday 06 October 1998 1:00:00 am

Be careful when using plasticizers. You might want to consider looking at the Tg of the polymer instead. Chose your polymer carefully. If you chose a polymer properly you can avoid the increased VOC with using the plasticizer.
Good luck John Mahon

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