Caracterização de compostos elastoméricos á base de EPDM com cargas híbridas

• Ano de defesa: 2012
• Autor(a) principal: Caleffi, Fabíola da Silva Unzelte
• Orientador(a): Pereira, Nilson Casimiro
• Banca de defesa: Miranda, Leila Figueiredo de , Esper, Fábio José
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Presbiteriana Mackenzie
• Programa de Pós-Graduação: Engenharia de Materiais
• Departamento: Escola de Engenharia Mackenzie (EE)
• País: Brasil
• Palavras-chave em Português: EPDM; borrachas; cargas
• Área do conhecimento CNPq: CNPQ::ENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICA
• Link de acesso: http://dspace.mackenzie.br/handle/10899/24234

Many studies have been done looking for new applications become viable for the ash of rice husks micronized. These studies include the use of this material as a reinforcing filler in elastomeric compounds to substitute other materials, to promote better mechanical performance such as tensile strength at break, hardness, elongation, and reduce the cost. The objective of this study was to obtain and characterize the elastomeric compounds based on EPDM and carbon black as filler and different concentrations of black ash of rice husks micronized and compare their performance with elastomeric compounds based on EPDM containing only black as filler smoke. The elastomer was processed in a calender with the respective filler, processing aids, plasticizers and curing system. After processing by calendering, the elastomeric compound has been tested that includes the rheological and rheometry testing by Dynamic Mechanical Thermal Analysis (DMTA). These tests showed, respectively, the parameters of speed of healing and glass transition temperature (Tg). Subsequently the material was cured in a hydraulic press with heating. To test resistance to oil, the specimens were immersed in ASTM oil 3 to measure the percentage of swelling. Were also performed mechanical tests of compression permanent deformation (compression set), tensile strength, tear strength, resilience and hardness Shore A. Through the results, it was observed that the addition of black ash rice hulls in the compounds modifies the glass transition temperature (Tg), but practically does not change the rheology during vulcanization. Compounds containing 20% black ash of rice husks showed better mechanical properties of tensile strength, tear strength and elongation. For higher concentrations, there is only the behavior of the filler. The addition of ash from rice hulls black also increases the hardness and improved oil swelling resistance and reduces permanent deformation to compression and resiliency.