Formulation design system for waterborne coatings

Formulation design system for waterborne coatings - film forming AIDS 2

2020-02-22 10:09:29
admin

The film-forming aids for waterborne wood coatings are generally alcohol ether type solvents. The most commonly used filming aids such as diethanol ethers, propylene glycol ethers and N-methylpyrrolidone have high and low boiling points.Water-based wood coatings in the summer construction, the water volatilization is faster, that is, the surface is relatively fast, some of the moisture may be enclosed in the coating film before drying, resulting in white coating or poor leveling.Therefore, it is possible to delay the drying speed of the coating film by adding a small amount of a suitable and suitable high boiling point solvent, to extend the opening time of the coating film, and to improve the workability and the appearance of the coating film. In winter, due to the lower temperature, the drying speed of waterborne wood coatings is slower, that is, the evaporation of water is slower, but the filming aids are relatively faster than water, and some may evaporate with water, so that waterborne wood coatings cannot The formation of a dense coating results in blushing and cracking of the coating of the aqueous wood coating.Therefore, when adding a film-forming auxiliary, it is necessary to consider overcoming the workability of the water-based wood coating in different seasons, and also considering the drying speed as much as possible. This is also the most difficult technical point of the water-based wood coating, especially the high Tg. Acrylic dispersion is more difficult to solve.Therefore, a variety of filming aids to match is the best choice.

The film-forming auxiliaries have a problem of compatibility with the resin system. In one system, a good film-forming auxiliary may cause system instability, or seriousness, or poor recoatability in another water-based wood lacquer.The formula should be designed with full consideration of this point, and the best filming aid and its dosage should be selected through experiments.

Sinograce Chemical produces water based coating,Water-based glue, polyurethane coating

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