FILK Freiberg Institute gGmbH
The friction of elastomers on dry substrates such as steel, glass or plastics often results in very high friction coefficients and associated friction instabilities, which can usually lead to undesired noise and heavy abrasion. Currently, rubber materials that are supposed to have a low coefficient of friction are coated with a bonded coating, flocked or halogenated in several steps (e.g. vehicle seals). However, these processes involve the use of environmentally hazardous substances and/or additional work steps and thus higher production costs. In addition, friction instabilities can be observed, especially with aging rubber materials, which harden due to loss of plasticizer and other aging mechanisms and lose their flexibility in contact with other substrates (e.g. windshield wipers or printing rollers). The partial replacement of reinforcing carbon blacks by novel, layered carbon fillers (graphene nanoplatelets) promises a significant improvement in this area. Investigations have shown that, on the one hand, an alignment of the platelets is very effective as a diffusion barrier for gases and other low-molecular substances such as plasticizers. On the other hand, friction on dry substrates can be significantly reduced, which is related to the formation of a graphite lubricating film. The aim of this project is the development of low-friction and ageing-stable elastomer composites using layered nano-fillers based on carbon (graphene nanoplatelets). On the one hand, the development of low-friction and ageing-stable elastomer materials will eliminate the problem of high friction against various substrates, which is typical for this class of polymers, without the need for surface coatings. On the other hand, the products manufactured in this way can be used for a longer period of time, as aging and wear are to be significantly minimized. Thus, it is possible to significantly increase both the service properties and the service life of elastomer products. This justifies the additional material costs of the nanofillers used, especially since only small quantities are required.
Abstract
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