Abstract
Propylene, methyl chloride, acetaldehyde, allyl chloride, acetone and methanol are detectable in the volatile gas generated from epichlorohydrin•ethylene oxide rubber (CHC) which has been heated at 160°C for 30min. Each volume of these gases is observed to increase with an increasing time of roll-blending with carbon black. The same kinds of gases are also determined in the volatile gas in CHC-vulcanization at 160°C. In addition, hydrogen sulfide is detectable in the vulcanizing compositions such as 2-mercapto imidazoline Pb3O4 and AF•CaCO3 at 160°C. The generation of hydrogen sulfide can be almost inhibited by addition of a sodium or calcium salt of AF in place of AF in the vulcanizing composition of AF•CaCO3. The volume of acetaldehyde and organic chloride can be also decreased by addition of ethylene urea or fatty amides in the vulcanizing composition described above.
