Kasman, Muhammad Zaki (2022) Optimization of compression molding process for mixing natural rubber with synthetic rubber. Masters thesis, Universiti Teknikal Malaysia Melaka.
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Abstract
NR/EPDM mixed development has continuously grown due to its superior physical characteristics and good weathering resistance, especially zoning. EPDM offers improved chemical resistance and oxidation, whereas NR has great strength and excellent dynamic characteristics. Through different procedures, such as latex dippers and extruding and calendaring, compression moldings, these rubber-based goods may be produced. For economic reasons, compression molding is an important method. The major problem of this procedure is that portion of the discrepancy is directly linked to the process parameter, which makes this technique less sustainable. Distortion and shrinking are two main issues related to elastomer compression. Because of the flexibility of the rubber material and the temperature that affects the material, it may become distorted by removing the rubber portion from the mold by deepening it. Furthermore, the reduction is the result of a restricted period for solidified material. Micro-fractures developed beneath the optical microscopic images on the rubber surface. This work focuses in this field on the investigation of the parameters of compression molding (i.e., temperature, pressure, heating time, and pressure time) and their impact on the mechanical characteristics of NR/EPDM elastomers (i.e., ultimate tensile strength (UTS), cross-lines and exenteration errors). The aim of the research is to determine optimal settings for processing compression molding. The optimization is accomplished using RSM and the Box Behnken technique as experimental design for a total of 29 runs. A mathematical model for each response is developed to access the relationship between the parameters. Furthermore, in the measurement of important input variables and potential interactions, the suitability of the models is statistically evaluated using an analysis of variance (ANOVA). Finally, numerical optimization is used to optimize several objective outcomes and verify anticipated results. Between 93% and 96%, there is a strong agreement between the experimental combinations and the chosen parameter combinations, confirming the solution as an optimum running condition. The results show that temperature and heating are the major components that affect ultimate tensile strength, while there is just one important temperature parameter for cross-link density. The temperature of UTS and link density decreases with the deterioration of the heat (the temperature is too high for NR/EPDM). Therefore, the procedure under the NR/EPDM degrading point is suggested to prevent scissoring rubber to improve the mechanical characteristics afterward.
| Item Type: | Thesis (Masters) |
|---|---|
| Uncontrolled Keywords: | Elastomers, Elastomers, Molding Rubber, Molding (Chemical technology) |
| Subjects: | T Technology > T Technology (General) T Technology > TS Manufactures |
| Divisions: | Library > Tesis > FKP |
| Depositing User: | F Haslinda Harun |
| Date Deposited: | 16 Oct 2023 11:02 |
| Last Modified: | 16 Oct 2023 11:02 |
| URI: | http://eprints.utem.edu.my/id/eprint/26924 |
| Statistic Details: | View Download Statistic |
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