Waterborne two-component paint seeds and loss of light - ask water-based paint experts
- 2020-02-22 17:51:45
- admin
Waterborne two-component paint seeds and loss of light - ask water-based paint experts
Question: Hello! I have two problems with the double-surface water-based topcoat. One is that when the film is thick, it is easy to produce rash [related to defoaming agent or related to water and curing agent to produce CO2?]. One is a double component. After mixing for 2 hours, it will lose light. What is the reason? Is there a solution? Thank you.
Answer: Our team of experts has had a heated discussion about your issue. Because we don't know your specific formula, we only guess based on the phenomenon you describe. Our experts have different opinions about your issue. We will now hand over the views of all the parties we have collected, and we hope to have a multi-faceted reference value for you.
View 1:
The seedsphenomenon that occurs when you encounter a thick film in a two-component water-based topcoat is due to the "Bernard vortex" phenomenon. Specifically, the solvent in the aqueous resin or the aqueous formulation system is not coordinated during the volatilization process. When the gas is generated, the surface of the paint film is dried and the gas is not discharged, so that dark bubbles or scorpions are formed below the paint film. To solve this problem, you need to adjust the recipe structure, especially to adjust the drying process of the recipe:
1. Pay attention to the drying speed of the resin itself
2. Pay attention to the coordination of additives
3. Pay attention to the choice of surface desiccant
As for your second question, this is due to the mismatch between the crosslinker and the resin and other additives in the formulation, and the cross-linking reaction is not normal. It is recommended to adjust the formulation structure and pay attention to the type and amount of additives.
View 2:
Question 1, if this phenomenon occurs only in thick film, it is likely that it is not caused by the problem of surface tension, that is, it is not necessarily the problem of defoaming. You can use a coating that avoids bubbles, such as scraping, to confirm.
Question 2, the two-component system has a certain period of use. After mixing the two components, the reaction starts in the prevention process, the molecular weight increases, and even cross-linking occurs. Intermolecular infiltration is affected during film formation, and it is impossible to form a microscopically flat film, which is macroscopically loss of light.
The first and second questions add up to look like you should use better quality resins and crosslinkers.
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