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Sep 30, 2016
Roller coating test method is very close to the actualcoating construction conditions, so that different defoamers can distinguishthe role played by. Youcan even try out the amount of added. In the roller coating test, a porous sponge roller pad, the 40grams of paint on the substrate is not adsorbed, can be a dedicated test cardcan also be other standardized test paper jam. The total coating area was 500 cm2. Before each test, therollers were wetted with the same amount of water to ensure reproducibility ofeach test. Wet film coatingrate of about 300 g / m2.
After the coating was dried, the test paper was comparedagain to evaluate the surface defects of the test panels. If the panel is backlit in a standardlight source, it is easier to distinguish the performance of the defoamer bycarefully observing the bubbles that appear as light spots.
The above-mentioned stirring test, flow coating test and rollcoating test are all useful for testing the effect and performance of theantifoaming agent. Todetermine the best defoamer for the product variety and dosage, to meet such asthe substrate, system, printing or construction conditions and other factors onthe defoamer requirements.