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Sep 28, 2016
The effectiveness of defoamers must first be determined inthe laboratory. Itis not advisable to transfer lab test results to production scale withoutfurther testing. Ourwork in the test method developed, combined with the paint manufacturing andconstruction process conditions, the defoamer Gongjiao evaluation is feasible. Different test methods can be selectedaccording to different construction conditions (such as brushing, spraying,dipping, printing, etc.).
Stirring test
For our users, the simplest test method is the stirring test. Under certain conditions, a piece ofturbine blades was used to infiltrate air into the coating system under testwith defoamers. Immediatelyafter the stirring, the material was poured into a graduated measuring bottleand then weighed. The difference in weight was used to determine the amount ofair infiltrated into the system, and the effect of the antifoaming agent wasdeduced. The test alsoshows how much air is present in the system in the form of spherical bubbles.
Another test method is used to detect the number of macrobubbles. Under certainconditions, the air infiltrated into the system, and then measure the height ofthe same weight of material through the measuring cylinder to evaluate theeffectiveness of defoamers. Methodcan guide us in the actual work of mixing capacity of selected containers.
Many defoamers can also cause paint film defects, such asshrinkage, which, like the foam problem, are undesirable for all of our inkproducers. Which can only beused by bulk, before and after a large number of experiments and experiments.