Not all the magnesium oxide can be used in CPE. Because the quality of magnesium oxide has significant implications for the performance of rubber type chlorinated polyethylene. Generally speaking, according to the bulk density, the magnesium oxide can be divided into light magnesium oxide and heavy magnesium oxide. According to the chemical active degree, it can be divided into high activity, middle activity, low activity and relative inertness magnesium oxide. Generally speaking, only the light magnesium oxide can be used for the vulcanizing agent of CPE. When you choose magnesium oxide, you should not just pay attention to the content, and mistake for the high content id better. What’s more, you should think about the quality of magnesium oxide from bulk density, active level(iodine absorption value or citric acid value), content, thickness, surface modification and other aspects. And then, selecting magnesium oxide after the experiment comparison.
A large number of tests show that the comprehensive quality has great relationships with the curing speed of CPE rubber, sizing material’s strength of extension, elongation at break and other physical properties. As a general rule, the light magnesium oxide with moderate activity is always applied by most formulas. At the same time, the more fine magnesium oxide’s granularity, the acid absorption speed is better. If you use appropriate coupling reagent to manage the surface, the magnesium oxide has a better dispersibility and consistency with rubber. In addition, it is more suitable to add and use in the rubber mixing.