Calcium And Zinc Stabilizer Processing Performance
Calcium and zinc stabilizer by the dosage form is divided into solid, liquid and paste three categories, according to the classification of PVC products can be divided into: profiles, pipe, cable, calendering film with calcium and zinc stabilizer.
Calcium and zinc stabilizer from the calcium salt, zinc salt, lubricants, Ca-Zn Stabilizer antioxidants as the main component of the use of special composite process and synthesis. It not only can replace lead and cadmium salts and organic tin and other toxic stabilizers, but also has a very good thermal stability, light stability and transparency and color strength. Practice has proved that in the PVC resin products, processing performance, Ca-Zn Stabilizer thermal stability is equivalent to lead salt stabilizer, is a good non-toxic stabilizer.
Calcium-zinc stabilizers are usually compounded with other auxiliaries to achieve the best results, which are called auxiliary stabilizers. Ca-Zn Stabilizer So what are these auxiliary stabilizers? Calcium zinc stabilizer professional manufacturer of small series with you to understand.
Β-diketone is one of the most widely used auxiliary stabilizers. It can be replaced with allyl chloride in PVC to stabilize the unstable components of PVC, forming a strong combination of C-C, and become a relatively stable structure. It can produce significant synergistic effect with calcium and zinc stabilizer, Ca-Zn Stabilizer thus improving the initial and mid-term coloring of PVC plastic products.
Phosphite is an auxiliary antioxidant and plays an important role in the antioxidant system. In the PVC formula is generally believed that the main role of phosphite chelating agent, when used alone no significant stabilization effect, but with the metal soap and after use, can complex metal chloride, Ca-Zn Stabilizer improve heat resistance and weather resistance, to maintain transparency.
3, polyol compounds
The mechanism of polyol as auxiliary stabilizer is similar to that of phosphite and β-diketone, which is the zinc chloride formed by complexation, thus delaying the degradation process of PVC. This type of variety with β-diketone, epoxy compounds, hydrotalcite with soft PVC used, with excellent synergies.
Since the degradation of PVC follows the thermal degradation under anaerobic conditions and the thermal oxygenation under aerobic conditions, the antioxidant can be used as a stabilizing component of PVC, with phenolic antioxidants in combination with phosphites or thioesters Can be used alone phosphite, Ca-Zn Stabilizer can show a good stabilizing effect, and this antioxidant system both to improve the initial coloring, improve the long-term stability of the dual role in the formula design can not be ignored.
5, epoxy compounds
Epoxy compounds and calcium and zinc stabilizers have a good synergistic effect. The principle is the epoxy soybean oil and HC1 reaction to produce chlorinated alcohol, and then react with the metal soap HC1 transferred to the metal soap, re-formation of epoxy ring. In addition, Ca-Zn Stabilizer epoxy soybean oil can displace allyl chloride in the presence of a Lewis acid such as a zinc compound to form a stable ether compound.
One of the high-performance auxiliary stabilizers in the calcium-zinc stabilizer is generally believed to be achieved by absorbing HCL, and its HCL capacity is substantially linear with the thermal stability time. The mechanism is divided into two steps: first, the anions (such as CO3-) between the interlayers are replaced by Cl- by the exchange reaction, and then the hydroxide moiety on the layer is neutralized with HC1 and the lamellar structure is destroyed.