How much do you know about the auxiliary stabilizer of calcium and zinc stabilizer? In recent years, due to the demand of environmental protection, the demand of calcium and zinc stabilizer is also increasing. The formulation of calcium and zinc stabilizer is also constantly improved. Calcium and zinc stabilizers are usually combined with other additives to achieve better results, these additives are called auxiliary stabilizers. So, what are these auxiliary stabilizers? Calcium and zinc stabilizer manufacturers xiaobian with you to understand.
1. Phosphite: phosphite is an auxiliary antioxidant and plays an important role in the antioxidant system. In PVC formula, it is generally believed that phosphite mainly plays the role of chelating agent, and has no obvious stabilizing effect when used alone. However, after being used with metal soap, it can complex metal chloride, improve heat resistance and weather resistance, and maintain transparency.
2, β-dione: β-dione is one of the widely used auxiliary stabilizers. It can be replaced with allyl chloride in PVC so as to stabilize the unstable components of PVC, form a strong combination of C-C, and become a relatively stable structure. It can produce obvious synergistic effect with calcium and zinc stabilizer, so as to change the initial and middle coloring of PVC plastic products.
3. Polyols: the mechanism of polyols as auxiliary stabilizers is similar to that of phosphite and β-diketone, which are all complexed zinc chloride, thus delaying the degradation process of PVC. This kind of varieties with β-diketone, epoxy compound, hydrotalcite used in soft PVC, has a good synergistic effect.
4, epoxy compounds: epoxy compounds and calcium and zinc stabilizers have a good synergistic effect. The principle is that epoxy soybean oil reacts with HC1 to form chlorohydrin, and then reacts with metal soap to transfer HC1 to metal soap, forming an epoxy ring again. In addition, in the presence of Lewis acids such as zinc compounds, epoxy soybean oil can replace allyl chloride to form stable ether compounds.
5. Antioxidants: Anaerobic conditions as the degradation of PVC thermal degradation and thermal oxidation under aerobic conditions, so the antioxidant components can be used as the stability of PVC, phenolic antioxidants with phosphite ester or thio ester, phosphite ester can be used independently, can show good stability, and the antioxidant system of both initial coloring, improves the long-term stability of the dual role, It cannot be ignored in formulation design.
6. Hydrotalc: one of the better auxiliary stabilizers in calcium and zinc stabilizer components is generally considered to be realized by absorbing HCL, and its HCL capacity is basically linear with thermal stabilization time. The mechanism is divided into two steps: first, the interlayer anion (such as CO3-) is replaced by Cl- through the exchange reaction, and then the hydroxide part on the layer is partially neutralized with HC1, and the layered structure is destroyed. Please add calcium and zinc stabilizer experts to analyze the synergistic effect of each component in zinc stabilizer!
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