Why should rubber be plasticized? What are the purposes of plasticizing? | Haisheng Questions and Answers
Rubber has good elasticity, but this valuable property brings great difficulties to the production of the product. If the elasticity of the raw rubber is not reduced first, most of the mechanical energy will be consumed in elastic deformation during processing, and it will not be possible to obtain The required shape rubber processing technology has certain requirements for the plasticity of the raw rubber. For example, mixing requires a Mooney viscosity of about 60, and rubber requires a rubber Mooney viscosity of about 40. Otherwise, it cannot be smoothly operated. Some raw rubbers are very hard and have a viscosity. Very high, lacking basic, necessary process performance-good plasticity. In order to meet the requirements of various processes, plasticization must be performed to make the raw rubber cut the molecular chain under the action of mechanical, thermal, chemical, etc., and reduce the molecular weight. Temporarily loses elasticity of the rubber and turns it into a soft, plastic compound. It can be said that raw rubber plastic smelting is the basis of other processes.
The purpose of raw rubber mastication is: first, to obtain a certain degree of plasticity for raw rubber, making it suitable for the requirements of processes such as mixing, calendering, extrusion, molding, vulcanization, and manufacturing of glue and sponge rubber; The plasticity of the glue is homogenized in order to obtain a uniform quality compound
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