Rubber technology requirements

The viscosity of elastomeric adhesives determines their method of application. Typically, solvent-borne rubber compounds require low viscosities for application. Thus, viscosities lower than 0.6 Pas for spray, curtain or dip applications are required, whereas for brush application viscosities lower than 5 Pa s are generally used. Roll- coating technology requires viscosities between 5 and 15 Pa s. 

Rubber technology is a mature science with a history going back some 150 years or more. Over the years a number of scientific discoveries (e.g. curing with sulphur to increase resilience and recovery, and the use of antioxidants to lengthen service life) have contributed to the material s dominance in applications requiring elasticity/recovery upon deformation combined with durability. Additives are used in rubbers in order to ensure that they possesses the correct properties to be processed, have the physical properties appropriate for the application, and sufficient stability and resistance to ageing in service. There are three basic steps associated with the processing of rubber ... 

Although the author enumerates some application details of rubber seals, the primary focus of this book is on the characteristics of rubbers as seals. Their manufacturing procedures, the implications of their physical and chemical characteristics for sealing in fluid and hydraulic systems, how rubbers seal and prevent leaks, what properties are required for sealing function, and how they change before and after installation are also discussed. It is hoped fliat this will draw mechanical engineers closer to rubber technology. 

Historically, the most popular in tire industry was chlorine-butyl rubber (CBR). CEPDC cauotchouc had limited application, because required level of rubbers ozone resistance in rubber technology, traditionally, ere-... 

Following the manner of presentation in the previous sections, the subject of viscoelasticity will be explained by reference to experiments familiar to the practitioner of rubber technology. This is a rather unorthodox approach and different from the usual one, which begins with an introduction of the theory. The experiment is tensile stress-strain measurement. In the rubber industry tensile measurements are routinely performed with crosslinked specimens. Here, we are concerned with gum-rubber behaviour. Therefore, we must perform the measurements with uncrosslinked specimens. First, compression-moulded specimens must be prepared they require special attention, which will be described next. 

Dynamic properties of rubber materials with respect to tire technology requirements. 

The research in this area has a great potential from scientific and technological aspects and requires further exploration. However, the reported attempts are a welcoming endeavor to hydrogenate nitrile rubber in latex form. 

Despite of 150-year s history of vulcanization process, it is impossible to consider that fundamental and applied researches in direction of vulcanization systems perfection are completed. For today one of the ways of rubbers properties improvement is the synthesis and application of the new chemicals-additives, including, vulcanization active, that is connected, first of all, with reduction of global stocks of zinc ores as basic raw material for reception of traditional activator - zinc oxide. Besides, modem increase of industrial potential and the accumulation of big quantity wastes derivate the problems of ecological character, which require the emergency decision. Therefore creation of resourcesaving technologies of the new compounds reception from products of secondary raw material processing has paramount importance. 

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