The working principle of calcium zinc stabilizer：
Zinc soap stabilizer is a poor stabilizer for PVC. It is a short-acting heat stabilizer. The sample with zinc soap will turn black when heated, which is called “zinc burning” phenomenon. The main reason is that the produced ZnCl2 is very strong. Acid, has the effect of catalyzing the removal of HCl, its initial coloring is excellent, the effect of preventing fouling is good, it can improve the weather resistance, and most of the zinc soaps are non-toxic, and show ideal stability in the gel formulation of paste resins ,The effect is that it not only absorbs HCl, but also reacts with allyl chloride to stabilize PVC. Zinc soap cannot be used alone.
Calcium soap stabilizer is a good stabilizer for PVC. It is a long-lasting heat stabilizer. Samples with calcium soap have an initial coloring phenomenon! Nor can it be used alone.
Therefore, traditionally, zinc soap and calcium soap heat stabilizer are combined to take advantage of the synergistic effect of the two. In order to increase the stability performance, hydrotalcite must be added. The hydrotalcite absorbs hydrogen chloride and has stronger stability performance, making it have a very wide range of Application areas.
In addition to some traditional uses of organotin, solid calcium-zinc composite stabilizers can also be used in some traditional uses of lead salts, such as large-diameter pipes and electrical insulating materials.
Post time: May-10-2021