国産酸化マグネシウムの特性値とイオウ変性CRの物性値との関係
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概要
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Several "synthetic rubber grade" magnesium oxides produced and commercially available in Japan were compared with "CR Grade" magnesium oxides produced abroad and imported into Japan.Japanese magnesium oxides were classified by the manufactures as "light" or "light calcined" magnesium oxides, but, their higher bulk density suggested that most of them do not belong to the "light calcined" category of magnesium oxides.Except for one brand, iodine absorption tests indicated that Japanese "synthetic rubber grade" magnesium oxides tested belong to the low activity grades. In Neoprene GNA compounds, the one exception, classified as high activity grade, gave good scorch resistance and a high state of cure based on modulus, while all other Japanese magnesium oxides tested gave less processing safety and bin storage stability according to their Mooney scorch time values.The combination of 8phr of the low activity magnesium oxide and 5phr of Zine oxide gave less scorch resistance than the combination of 4phr of high activity magnesium oxide and 5phr of Zine oxide.The combination of 16phr of low activity magnesium oxide and only 1phr of Zine oxide gave the same scorch resistance as that of 4phr of high activity magnesium oxide and 5phr of Zine oxide.
- 一般社団法人 日本ゴム協会の論文