Preparation and properties of natural rubber filled with channel black

Abstract

The effects of γ-aminopropyltriethoxysilane (KH 550), 1,6-bis(N,N′-dibenzothiazolylformamyldisulfide)-hexane (WY 988), mixing temperature and time on Mooney viscosity, curing characteristics, physical and mechanical property, compression set, creep property and their stability of natural rubber compounds filled with channel black had been investigated. The results showed that with the addition of KH 550, Shore A hardness and modulus at 300% of vulcanizates increased, and compression set and creep property were significantly improved. The optimum amount of KH 550 was 0.9 phr, the stability of Mooney viscosity, the difference between maximum torque and minimum torque (MH-ML), Shore A hardness and modulus at 300% of vulcanizates were significantly improved. As for the compounds mixed at elevated temperature and prolonged time or with the addition of WY 988, the stability of Mooney viscosity, MH-ML, Shore A hardness and modulus at 300% of the compounds were improved significantly. Shore A hardness and modulus at 300% of the vulcanizate increased while compression set and creep increment decreased.

Keywords

• channel black
• natural rubber
• stability
• mooney viscosity
• curing characteristics
• physical and mechanical property