酸化マグネシウムの特性値と非イオウ変性CRの物性値の関係

概要

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Except for one brand, all Japanese magnesium oxides tested proved to be of low activity, notwithstanding their classification as "light calcined". (Report No. 1)Tests on Neoprene type W compounds showed that:1) In gum stock compounds accelerated with 2-mencapto-imidazoline, Japanese low activities magnesium oxides. gave somewhat less scorch resistance than the high activity magnesium oxides. However, in lightly loaded compounds with carbon black, hard clay or whiting, the differences in magnesium oxide activity was of little significance.2) In lightly loaded carbon black, clay or whiting compounds accelerated with 2-mercapto-imidazoline and tetra-methyl-thiuram-disulfide, the scorch resistance and state of cure based on modulus given by Japanese magnesium oxides were poorer, but the differences were not as great as in the case of Neoprene GNA compounds.3) In lightly loading carbon black, clay or whiting compounds accelerated with tetra-methyl-thiuram-monosulfide, di-o-tolylguanidine and sulfur, the scorch resistance and states of cure based on modulus given by Japanese magnesium oxides were much lower.
日本ゴム協会の論文