Serpentinite as accelerator and activator of the process of vulcanization of natural rubber (NR) and copolu00ecmeros random styrene - butadienos (SBR) and as a reinforcement of the vulcanized rubbers

摘要

In the production of natural rubber (NR) or synthetic (SBR), the vulcanization process increases the strength retrativa and reduces the permanent deformation introduced after the elimination of the mechanical loading of a material. During this process, there is the formation of cross links between the linear polymeric chains.In the proposed process by Goodyear in 1839 have 100 parts per weight of natural rubber, 8 parts by weight of sulfur and a cure time of 5 hours to 142 degrees Celsius.Currently, for the production of natural rubber have 100 parts by weight sulfur to three parts by weight, an activator such as zinc oxide to 5 parts by weight, stearic acid to one part by weight, an accelerator such as mercapto benzoitiazole - MBT, 1 part by weight, and antioxidants C Coca Cola, for example, phenols and amines, with the healing going on in 20 minutes to 142 198 C.The present invention proposes to attach to the current model of vulcanization of natural rubber (NR) and synthetic (SBR) serpentinite, a silicate inorganic magnesium, in quantity and particle size, which will act as the accelerator and activator of the process, leading to reduction in the time of PR. It is vulcanizau00e7ao (scorch time)Reduction of curing time and increase speed of cure and a gain of mechanical properties in the final product, acting as an agent of reinforcement. The organic or inorganic silicates, until then, introduced in the vulcanization process were not recommended due to make a C Omportamento inhibition to the vulcanisation process.On the contrary, the serpentinite has proved to be effective as an accelerator and activator of the vulcanization process in this study, in addition to provide structural reinforcement to the end product. Hence its uniqueness.The results obtained in this discovery shows that the introduction of 20 sym of serpentinite in particle sizes of less than 0.5 mm apart from the known additives in the curing process in natural rubber (NR) and sinteticas (SBR) was able to activate the process of Vulcan Modules (i.e.: reduce the scorch time ") and increase the speed of vulcanization (accelerator).One can see that the serpentinite reduces by about 50 sym time of vulcanization and increases by about 200 sym (bend) the speed of vulcanization; was able to slightly increase the modulus of elasticity and substantially to the mechanical resistance (increase of 30 sym ) and the defo Rmau00e7u00e3o in fracture (an increase of more than 100 sym ).These results show that the serpentinite is acting as accelerator and activator of the vulcanization process, and as a reinforcement for rubber.