resumo
This paper describes a study in which EPDM-based rubber composites were investigated aiming at developing formulations subjected to restrictions on cost and the properties of the material. The contents of components other than calcium carbonate, paraffinic oil, and CBS vulcanising accelerator, as well as additives and processing conditions, were kept constant. Fractional factorial design coupled with computational numerical optimisation was used to minimise the number of mixtures. The results demonstrate that statistical design of experiments and particle swarm optimisation (PSO) algorithms are promising methods to design composition variables. Mixture costs as low as 1.92 US$/kg can be achieved in compositions containing, for example, 107 phr of calcium carbonate, 95 phr of paraffinic oil, and 1.13 phr of CBS accelerator. The corresponding composite property-predicted values were 66.8 Shore A for hardness, tensile strength of 7.8 MPa, 570.8% elongation at break, and 23.0% rebound resilience.) is demonstrates that, in this way, the desired product with specified characteristics can be comfortably manufactured at minimum cost.
palavras-chave
RESPONSE-SURFACE METHODOLOGY; STYRENE-BUTADIENE RUBBER; TRIAXIAL PORCELAIN; DESIGN; COMPRESSION; STRENGTH; BEHAVIOR; HARDNESS; BODIES; SET
categoria
Materials Science
autores
Correia, SL; Palaoro, D; Segadaes, AM
nossos autores
Ana Maria B C Segadães
Professor(a) Jubilado(a)agradecimentos
This research was supported by UDESC-Joinville Project 15085/2011 (Sivaldo Leite Correia). The authors appreciate the financial support received from the Brazilian Research Agencies CNPq (Sivaldo Leite Correia) and CAPES (Denilso Palaoro) and from the Santa Catarina State Research Agency FAPESC (Project 3338/2013) and are thankful to NSO Borrachas Ltda (Joinville-SC, Brazil) for providing the raw materials and access to its laboratories for the development of this work.