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Vulcanization and the rubber process scorch Send date: 2012-11-19 15:25
Production whether in daily life or lives, about some of the basic properties of matter, the basic phenomena related to chemical properties, we have to understand the necessary. Master these helps that we use to use, it may be appropriate to extend the life of these objects. Rubber mesh some rubber characteristics.

What is the vulcanization of rubber? The term "curing" historic, first natural rubber products with sulfur crosslinking agent named, with the development of the rubber industry, can now use a variety of non-sulfur crosslinking agent for crosslinking. Vulcanized more scientific significance should be "cross-linking" or "bridging", the process of the linear polymer is formed by crosslinking of the polymer mesh. I.e. from the physical properties is a process of plastic rubber into an elastic rubber or hard rubber. The meaning of "curing" includes not only the actual cross-linking process, and further comprising generating a crosslinking method.

The curing process can be divided into what four stages? What are the characteristics of each? A: the glue correctly predicted tensile strength measurements (or curemeter) you can see the whole the vulcanization vulcanization process can be divided into induction, pre-sulfur, the vulcanization and persulfate (on the natural rubber is vulcanized reversion) four stages.

Cure induction period (scorch time), crosslinking is not yet started, the plastic material has good fluidity. This stage decided to scorch and processing of rubber security. The end of this stage, the plastic material starts crosslinking and loss of fluidity. Sulfide induction period in addition to the nature of raw rubber, mainly depending on the additives used, such as delayed sexual accelerator can get a longer scorch time, and higher processing safety. The cure induction period, that is, to a certain speed of crosslinking the pre-curing stage. Pre-vulcanization of the degree of crosslinking is low, even to the latter part of vulcanized rubber Tensile strength, elasticity can not reach the desired level, but the tear and rip the performance than the corresponding vulcanization. Rubber products to reach the stage of the vulcanization, the physical properties of the vulcanized rubber or near the optimum point, or to achieve the performance of the consolidated balance. After the vulcanization stage (vulcanization flat area), is defined by the sulfur stage, there are two situations: natural rubber "reversion" phenomenon (elongation strength decline), most of the synthetic rubber (butyl rubber) and elongation strength continue to increase. For any rubber, vulcanization is not just cause crosslinking, but also due to thermal and other factors, the role of production the production of the linked chain and a molecular chain fracture. This phenomenon throughout the vulcanization process. Persulfate stage, still have the edge if the cross-linking

What is scorch? A: the scorching rubber sulfuration early in the process. The scorch substantially affect the accumulation of plastic material during the process of heat and time, can also be called the heat history of the plastic material. The thermal history of the rubber more than long, more than high temperature, you can gradually shorten the scorch time of rubber. (The rubber heat storage processing process, early vulcanization (cross-linking) and lose the current performance and the ability to reprocess, which is called scorch phenomenon. Scorch problem to solve what ways? Usually by under way to address: (1) adjust the curing system, sulfenamide accelerator using greatly improved scorch performance. (2) to improve the the rubber storage and processing conditions, such as strengthening cooling; (3) the use of anti-scorching 
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