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Dec 26, 2017
Defoamers are added to the system with high shear, but excessive shear forces weaken the defoaming effect. Defoamer over-dispersion and poor dispersion, are not conducive to the effectiveness of defoamers play, add defoamer when using a relatively low shear force, the initial defoaming effect may be good, but after the storage phase, defoaming The effect of the agent may be reduced.
In general, defoamers are designed to be used in the state of supply. If the shear force is insufficient when added, the defoamer of 100% active can be pre-diluted with alcohol or coalescent. The dilution ratio is in the range of 1: 1 to 1: 9 dilution for defoamers to facilitate the addition and improvement of the size distribution of defoaming particles. This will help to improve defoaming efficiency and reduce the tendency of shrinkage. Pre-dilution of defoamers will generally reduce the long-term stability of the antifoam actives and hence the storage stability of the defoamers after dilution.
Many defoamers can also cause paint film defects, such as shrinkage, which, like the foam problem, are undesirable for all of our ink producers. Which can only be used by bulk, before and after a large number of experiments and experiments.