燃焼法によるゴム中のカーボンの定量

概要

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The combustion method used for the determination of carbon black contents in the black rubber, is based on distilling the test sample in a stream of carbon dioxide and removing rubber fraction. But actually it is impossible to calculate the amount of raw black in the test sample by the formula specified in ASTM, because of the existence of the residual ash, the residues formed by the carbonization of polymer, and the removal of volatile matters in the raw black. We have determined corrective factors for these items and proposed a formula to determine the amount of raw black. Furthermore, ASTM specifies the use of the standard sample to correct the aberration resulting from the interaction between the polymer and the black, but we have determined previously the corrective factor for this interaction by using the standard sample, and developed new procedure, by which the amount of black in the test sample can be calculated directly. On numerous test runs for the latex-black masterbatches on our pilot plant, it has been found that the difference between the calculated values from the material balance and the analytical results by our new procedure, is negligibly small.
日本ゴム協会の論文