Calcium-zinc stabilizer can keep the product performance stable and slow down the aging speed of the product. It has become an indispensable additive and PVC stabilizer in the production process of plastic and rubber products.
At present, the widely used field of calcium-zinc stabilizer is still the plastic industry, which is used in the production process of plastic parts, plastic pipes, plastic films, wires and cables. The market trends of these products depend to a large extent on the development of the construction industry. Therefore, the rise and fall of the construction industry plays a crucial role in the market demand for PVC calcium and zinc stabilizers.
Due to the different metal activities of the complex calcium-zinc stabilizer system, the stability of various metal soaps to PVC is also different. In addition to calcium/zinc composite calcium-zinc stabilizers, new varieties of calcium/zinc/tin, aluminum/calcium/zinc, calcium/zinc/magnesium, rare earth/zinc composite calcium-zinc stabilizers have also appeared. If high active zinc soap or tin soap is used together, and barium, cadmium, zinc and other soaps are compounded, a synergistic effect can be produced and a good stabilization effect can be obtained.
Calcium and zinc stabilizers are now focusing on the development and application of calcium and zinc stabilizers. Calcium-zinc composite hot calcium-zinc stabilizer is one of the promising varieties. The commonly used calcium zinc hot calcium zinc stabilizer is cheap and has good lubricity. And it is very similar to the lead salt formula system in terms of formula, lubrication mechanism, processing technology and so on. Lead salts are easy to replace, but have poor thermal stability. Moreover, zinc soap often causes “burning zinc” of the product, which limits the use of zinc soap in occasions with high performance requirements.
Ca/Zn composite calcium zinc stabilizer can be divided into solid and liquid. During the processing of PVC products, the chlorides generated by the reaction of HCl released by PVC with zinc compounds are the real catalysts for the degradation of PVC polymer materials. The role of calcium carboxylate is that, once the above-mentioned zinc polymer complex is formed, it can neutralize HCl and inhibit the conversion of the zinc polymer complex to zinc chloride, thereby stabilizing the polymer.