By John S. Dick
This e-book is a realistic consultant to within your means formulating of rubber compounds to accomplish optimum processing and function. It offers a radical dialogue of the foundations of rubber compounding, rubber trying out, and the way a variety of compound alterations have an effect on various homes and try out measurements. Partial Contents: Rubber Compounding. Compound Processing features and trying out. Vulcanizate actual houses, functionality features, and trying out. Rubber Compound Economics. The Technical venture method of Experimental layout and Compound improvement. Elastomer choice. common goal Elastomers and Blends. strong point Elastomers. Polyurethane Elastomers. Thermoplastic Elastomers. Recycled Rubber
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Extra info for Rubber Technology 2E: Compounding and Testing for Performance
Direct shrinkage measurements. 1 Mooney Stress Relaxation In 1996, a new Part B for measuring stress relaxation was added to ASTM D1646, the Mooney Viscosity Standard. This new method is widely used in the rubber industry because it can measure Mooney viscosity as well as stress relaxation decay rates. Stress relaxation tests are run on the same specimen immediately after completing viscosity measurements. For example, an ML 1 4 test (large rotor, 1 minute preheat, 4 minutes run) can be performed on a raw rubber sample followed by a two minute stress relaxation at the end of the test.
Dick [Refs. on p. 441 Tackiness Tackiness refers to the ability of an uncured rubber compound to stick to itself or another compound with a short dwell time and a moderate amount of applied pressure . This property is very important whenever rubber products, such as tires or conveyor belts, are built by laying one calendered or extruded rubber ply on top of another. The uncured product must hold together before it is placed in a mold or press for cure. Usually compounds based on natural rubber have good building tack.
2. 1 1 Log-log plot of RPA dynamic complex viscosity q* vs. /s (frequency sweep). 12 Comparison of power law slopes for shear thinning as measured with a capillary rheometer vs. an oscillating rheometer (RPA). The Rubber Process Analyzer is very simple to operate and versatile in applying different shear rates by either varying the frequency or varying the strain. It is a unique instrument because it can apply very high strains to an uncured rubber specimen in a sealed pressurized cavity and achieve very repeatable results.