NR is usually masticated for viscosity reduction through breakdown of the long molecular chains to facilitate subsequent processing steps (e.g., extrusion and calendering) and improve rheological properties, such as die swell, shrinkage and building tack.
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Ethylene propylene diene polymers (EPDM) are the most widely used rubbers in the range of available synthetic rubbers for non-tire applications. Due to the unsaturated backbone, EPDM can be employed in various applications in which characteristics such as resistance to ozone, heat and moisture, flexibility at low temperatures, a wide range of tensile strength and hardness levels, and excellent electrical insulating properties are important
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In order to investigate all the effects of the processing parameters on the mixing properties without having to do a number of experiments, the statistical tool, called response surface methodology (RSM), has been used. This technique has the capability to evaluate all the effects of the parameters on the responses, which include linear, non-linear and interaction effects. Simultaneous Effects of Mixing Parameters on Internal Mixing of Rubber and Carbon Black Using Response Surface Methodology
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The disposal of scrap rubber has been a concern since its vulcanization with sulfur and heat was accidentally discovered by Charles Goodyear in 1839. In addition to the scrap generated in production, there is the question of discarded rubber goods that have outlived their usefulness for their original function. Traditionally, this waste had ended up in landfills, contributing to the growing problem of overcrowding. Scrap tires are a well-publicized category of scrap rubber, as each year automobiles produce 246 million waste tires in the United States alone.
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Processing promoters (additives) improve the efficiency of compound mixing and processing, and facilitate complex manufacturing processes.
Processing additives influence the whole production process, from compounding to the finishing of the rubber article.
by Michael F. Drenski, Wayne F. Reed, Piotr Kozminski, Terry Hogan, Bridgestone Research Americas The production of SBR via anionic
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by Hans P. Hurlimann, ETH Zurich Why is there so little discussion these days on basic problems of rubber compounding?
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by Glenn Wray, Hexpol Compounding Selecting and compounding the right elastomer for wire and cable production is a balancing act.
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