Abstract
AbstractGround tire rubber (GTR) with crosslinked structure shows hardly any plasticity and processability, giving rise to its relatively poor properties. The thermal-mechanical shearing devulcanization can effectively break the three-dimension crosslinked network structure and restore a certain extent of plasticity and processability. In this work, reclaimed rubber (RR) was obtained by thermal-mechanical shearing devulcanization as a potential filler for natural rubber. The vulcanization process, mechanical properties, microstructure of RR/natural rubber (NR) compounds composites were investigated. It was found that the NR vulcanizates containing 30 phr of RR as filler showed the higher tensile strength and elongation at break. Microstructural characterization analysis on a sample containing 30 phr of RR revealed the existence of strong interactions between the natural rubber matrix and RR, suggesting that RR and NR appeared to be well-matched, undergoing simultaneous curing and forming a continuous phase.
Highlights
structure shows hardly any plasticity Canladsspirocceastsiaobni:li1t7y,B37p, r1o5dAu2c1tion of waste rubbers is increasing rapidly [1]. giving rise to its relatively poor properties
With increasing the amount of RR, and the cure rate increased, whereas the scorch time and optimum cure time decreased continuously. This could be explained as due to the fact that reclaimed rubber was obtained by the desulfurization and regeneration of the ground tire rubber powder, and contains carbon black and small molecules, the specially structured reclaimed rubber can be used as an elastic filler in Natural rubber (NR), because reclaimed rubber and natural rubber showed better compatibility with natural rubber than the other fillers
The morphologies of the RR/NR and Ground tire rubber (GTR)/NR compounds were examined by scanning electron microscope (SEM) (S-6390; Hitachi, Tokyo, Japan) at an accelerating voltage of 30 kV
Summary
NR, grade SVR3L, with mooney viscosity (ML[1+4]100°C of 72, relative density of 0.93 g/cm, ash content of 0.42% and polyisoprene content of 91-94% was supplied by the Creative Polymers Co., Ltd. (Bangkok, Thailand). GTR powder, with the particle size of 30 mesh, volatile component content of 6 wt%, rubber content of 58 wt%, carbon black content of 30 wt%, and ash content of 6 wt% was purchased from the Nantong Huili Rubber Co. Other curing ingredients and additives such as triethylene amine, dioctyl phthalate, petroleum resin, zinc oxide (ZnO), stearic acid (SA), N-Cyclohexyl-2-benzothiazole sulfonamide (CZ), tetramethyl thiuram disulfide (TMTD), N -1 , 3 - dimet hy lbutyl - N ′ - p h e ny l - p - p h e ny lenediamine (6PPD) and sulfur were purchased from Bayer (M) Sdn. Bhd. Using 100 phr of rubber as the reference, the amount of sulfurizing agent and reagents are as follow: 100 phr rubber, 5.0 phr ZnO, 2.0 phr SA, 0.5 phr CZ, 0.2 phr TMTD, and 2.0 phr sulfur
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