キシレン変性メラミン樹脂によるSBRの改質補強について-1-

概要

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It was stated in our previous paper that xylene-melamine resin prepared by modification of melamine formaldehyde resin with xylene formaldehyde had good dispersive effect on SBR and gave SBR excellent reinforcement. In this paper, the effects of xylene-melamine resin on SBR were studied in further details. The results were obtained as follows. 1) The effect of reinforcement on SBR depended on the composition of xylene-melamine resin. A maximum value of tensile strength was obtained from a resin consisting of 80 parts of xylene resin and 100 parts of melamine resin. 2) The vulcanization rates were generally decreased by addition of xylene-melamine resin. 3) Some kinds of accelerators affected the cure rate of resin. The acidic compounds, thiurame and thiazole increased the cure rate, but, the basic compounds, guanidine and imidazole decreased it. 4) The relationship between the amount of xylene-melamine resin and its reinforcing effect on SBR was examined. Maximum value of tensile strength was shown when the resin of 25 phr was added into SBR. 5) The milling time to the optimum physical properties of reinforced SBR was somewhere between 6 and 9 minutes, the physical properties were rather reduced when the milling time was longer. Dispersion state of resins in the cured SBR was also observed under a phase-contrast microscope.
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