Performance requirements of coatings in water glass investment casting
Author: Date: 2021-3-2 14:59:21
Sodium silicate casting coating is a water-based coating composed of a mixture of sodium silicate binder,refractory powder,surfactant and defoamer. In addition to ensuring the good working characteristics of the shell and the high quality requirements of the casting ,It should also have good process performance.
① The coating should have good hang-coating and covering properties,so that it can hang and cover the surface of the investment mold more evenly and tightly.
② The coating should have good fluidity and appropriate viscosity,so that the surface of the investment mold has a suitable coating thickness,and can be evenly distributed without accumulation or flow.
③. After the paint is fully stirred,it should be well dispersed,even up and down,without precipitation,agglomeration,bubbles,and stable performance.