A. Haehl
Dec 1, 1950
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Journal
Rubber Chemistry and Technology
Abstract
Abstract One conclusion to be drawn from the present work is that a combination of zinc dibutyldithiocarbamate and benzothiazolyl disulfide is a particularly advantageous one for the manufacture of cellular rubber. By means of this combination of accelerators it is possible, by proper balancing of their proportions and of the percentage of sulfur, to adjust at will the stability of the rubber mixture with respect to blowing and to the rate of vulcanization as soon as blowing is complete. The good solubility of zinc dibutyldithiocarbamate in rubber guarantees a very rapid onset of vulcanization after the blowing action. It is evident that the most suitable method for manufacturing cellular rubber products is stepwise vulcanization. At the beginning, for example, heating may be at a temperature corresponding to 2 kg. per sq. cm. steam pressure, which allows satisfactory blowing of the rubber mixture; following this the temperature is raised rapidly to a point corresponding to 4 kg. per sq. cm. steam pressur...