The role of aluminum silicate in coatings
ã€China Aluminum Network】 1. Superfine aluminum silicate replaces part of titanium dioxide, its dry film hiding power will not change, and it can improve the whiteness of the paint. If the amount of titanium dioxide is not changed, the dry film hiding power is obviously improved, and the whiteness is greatly improved.
2. The pH range of ultrafine aluminum silicate is 9.7 to 10.8, which has a pH buffering effect. In particular, in the storage of vinyl acetate emulsion paint, it is possible to prevent the pH value from being lowered due to the hydrolysis of vinyl acetate, to increase the dispersion stability of the latex paint, and to avoid the corrosion of the inner wall of the metal container.
3, the ultra-fine, grid structure of aluminum silicate makes the latex paint system slightly thickened, has a good suspensibility, and prevents the occurrence of solids sinking and surface water separation phenomenon.
4, ultra-fine aluminum silicate latex paint has a good scrub resistance, weather resistance, in addition to shorten the surface dry time.
5, ultra-fine aluminum silicate extinction effect, so in the semi-gloss, matt paint can be used as an economic matting agent, should not be used in glossy paint.
Note: Ultra-fine aluminum silicate must be dispersed evenly in order to show better synergistic effect, otherwise it may make emulsion paint thicken. Replacing part of titanium dioxide with ultra-fine aluminum silicate is a commonly used technology in the coating industry at home and abroad, and it has obvious economic benefits. The appropriate amount of ultrafine aluminum silicate in the matt, semi-gloss paint is 15 to 25% of the amount of titanium dioxide (4 to 6% of the total amount of paint). However, the amount of substitution of the different formulations is also different. It is recommended that each user Before the application of some small test, to replace the amount of titanium dioxide with a larger limit without affecting the film hiding power to achieve better results.
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