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Overview

To examine the activation energy and the temperature coefficient for an indirect vulcanization process in comparison with those in press vulcanization, measurements of the modulus were made for 3 kinds of natural rubber compounds with compositions of practical use.An induction period was noticed by the modulus method even for the press cure, according to the operating conditions.The value was far larger for indirect vulcanization.The activation energy and temperature coefficient for indirect vulcanization were estimated to have almost the same value as those in press vulcanization, provided the induction period was considered, though the comparison could not be made exactly because of the essential difference of accuracy for the 2 processes.

Nippon Gomu Kyokaishi

Activation energy and vulcanization temperature coefficient. II. Activation energy and vulcanization coefficient by Mooney scorch time

Author: Ikkaku, K.

An experiment was made to obtain the activation energy and temperature coefficient in press vulcanization from the measurements of Mooney scorch time for 3 kinds of natural rubber compoundsBy assuming the time lag to be 2 min., both in the case of 5 points and 10 points rise, a linear relation was obtained between the log of scorch time (t - 2) and the reciprocal of the absolute temperature (1/T).From the results, it was apparent that the activation energy of the compounded rubber could be obtained much more efficiently by this method than by the modulus method, and that the temperature coefficient of vulcanization, calculated from the activation energy, was subject to a smaller error.

Toso Kogaku

Technical trends in titanium oxide pigments

Author: Ishida, Kuniteru

The suitability of Ti oxide (I) pigments as coating materials and the possibility of use of I of noncoating grade as functional industrial materials are reviewed with 15 references

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