Solutions . . . For water-based two-part PU wood paint bubble problem.

Water-based two-part PU wood paint bubble problem
With the increasing maturity of water-based wood paint, customer performance requirements for water-based wood paint is also constantly improving, water-based two-part PU wood paint development is also more and more attention. We know that the water-like system due to the presence of more surfactants, bubble problems have been more prominent. The water-based two-component PU also releases some carbon dioxide gas further due to its side effects, and the bubble problem becomes more acute

. Moreover, the production of this part of the gas is often in the paint film at the beginning of part of the table dry, the system of these reaction bubbles will be more difficult to remove. Especially in the higher film thickness construction conditions, to completely solve the water-based two-part PU bubble problem becomes extremely difficult, paint film is particularly prone to tweezers bubbles.
" for the water-based two-part PU wood paint bubble problem,
such as the use of more effective de-foaming agent treatment, often has not been able to completely solve the reaction bubble at the same time, but also brought new defects (such as shrink holes).
use some relatively mild de-foaming agents, through reasonable combination with other additives, can more effectively achieve formula balance, formula optimization.
1, pre-construction de-foaming
First of all, we need to find a de-foaming agent to meet the water-based two-part PU wood paint just when the construction of de-foaming needs, before the table dry to remove the bubbles in the system. TEGO and Airex 902 W of the Created® Coatings Additives line of business are recommended here as the preferred de-foaming agent. The emulsion-type de-foaming agent provides a good de-foaming effect at the same time, can ensure high compatible, thus avoiding the paint film shrink holes and other defects.
2, the removal of the reaction bubble in the 1930s
Next, the next challenge we face is the appearance of the reaction bubble in the later stage, at which point the paint film begins to enter the table drying process, which is very detrimental to the removal of micro-bubbles. SURFYNOL® AD 01 is a molecular-type de-foaming agent with excellent compatibleity, with a high boiling point that helps extend the opening hours of the paint film and effectively helps to take the resulting reaction bubbles out of the paint film. In addition, SURFYNOL ® AD 01 promotes film forming, helping to further reduce the amount of film-forming additives and the construction of VOC. In addition, it provides additional dynamic wetting to help improve rapid wetting and spray atomization during construction, improve construction tolerance, and reduce batch-to-batch differences. Of course, as a versatile additive, its single aspect of performance is not particularly strong, recommended for use with, and need a higher amount of addition than conventional additives.
1: Water-based two-part PU bright finish paint, TEGO® Airex 902 W with SURFYNOL® AD 01 effect
3, avoid the use of stable foam surfactant
Finally, we also need to try to avoid the use of stable foam surfactants (including substrate wetting agents, leveling, feel agents, and even wetting dispersants, etc.), reduce the pressure on the system deblistering, avoid the appearance of hazelnut bubbles, thereby helping to improve the thickness of the film that can be constructed. Twin substrate moisturizer TEGO® Twin 4100 and emulsion-based embossing agent TEGO® Glide 494, these two foam-suppressing, efficient products are more suitable for such needs.
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1, in the water-based two-component PU wood paint, we recommend TEGO® Airex 902 W with SURFYNOL® AD 01 and TEGO® Twin 4100 combination to achieve formula optimization, to solve the problem of bubbles / reaction bubbles.
2, such as the sense of opponent also has higher requirements, can be further combined with the ® Glide 494.
3, of course, the water system is complex and diverse, a set of solutions may not meet the needs of all systems, Ewing coating additives business line has a very rich product range, can provide formula designers with more solutions.
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