Influence of TMTM as the Secondary Accelerator on Blooming Resistance of NBR-PVC Blends
NBR-PVC copolymer blend provides a combination of better chemical resistance and weathering resistance. In NBR-PVC blends, di-accelerator system is normally used to achieve desired properties with better cross-linking density. Tetramethylthiurammonosulphide (TMTM) is widely used as the secondary accelerator to achieve various properties like heat ageing and high cross-linking density. When TMTM level is exceeding the soluble limit, blooming phenomena observed in the di-accelerator system. This study deals with the effect of accelerator system on blooming phenomena in NBR-PVC material. Various combinations of tetramethylthiurammonosulphide (TMTM), Mercapto-benzothiazole disulphide (MBTS) and N-Cyclohexyl-2-benzothiazole sulfenamide (CBS) were worked out to eliminate the blooming effect with desired functional properties are discussed in this paper.
KeywordsNBR-PVC blends TMTM Blooming Ozone resistance Compound mixing Secondary accelerator
The authors would like to thank WABCO India Limited to support this project and like to express my gratitude to Mr. V. P. Balaji from WABCO for the valuable technical guidance and support.
The authors also would like to thank Mr. Nermaiselvan and M/S Roop Polymer management for the excellent support provided to carry out experimental trials.
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