Jeong Keuk Min, Hong Yeo Joo, Saha Prosenjit, Park Seong Ho, Kim Jin Kuk
Department of Materials Engineering and Convergence Technology, Gyeongsang National University, Jinju, South Korea.
Columbian Chemicals Korea, Jeonam, South Korea.
Waste Manag Res. 2014 Nov;32(11):1113-22. doi: 10.1177/0734242X14545375. Epub 2014 Aug 8.
In this study, a composite has been prepared by mixing waste rubber, such as ethylene-propylene-diene-monomer and low-density poly ethylene foaming, with supercritical carbon dioxide. In order to optimise the foaming process of the waste ethylene-propylene-diene-monomer-low-density poly ethylene composite, the variations of pressure and temperature on the foamed Microcell formation were studied. As indicated in scanning electron microscope photographs, the most uniform microcellular pattern was found at 200 bar and 100 °C using 30% by weight of waste ethylene-propylene-diene-monomer. Carbon dioxide could not be dissolved uniformly during foaming owing to extensive cross-linking of the waste ethylene-propylene-diene-monomer used for the composite. As a result the presence of un-uniform microcells after foaming were observed in the composite matrix to impart inferior mechanical properties of the composite. This problem was solved with uniform foaming by increasing the cross-link density of low-density poly ethylene using 1.5 parts per hundred dicumyl peroxide that enhances composite tensile and compressive strength up to 57% and 15%, respectively. The composite has the potential to be used as a foaming mat for artificial turf.
在本研究中，通过将废橡胶（如三元乙丙橡胶和低密度聚乙烯泡沫）与超临界二氧化碳混合制备了一种复合材料。为了优化废三元乙丙橡胶-低密度聚乙烯复合材料的发泡过程，研究了压力和温度对微孔形成的影响。扫描电子显微镜照片显示，使用30%重量比的废三元乙丙橡胶时，在200巴和100℃下可获得最均匀的微孔结构。由于用于复合材料的废三元乙丙橡胶存在大量交联，发泡过程中二氧化碳无法均匀溶解。结果，在复合材料基体中观察到发泡后存在不均匀的微孔，导致复合材料的机械性能较差。通过使用每百份1.5份过氧化二异丙苯提高低密度聚乙烯的交联密度来实现均匀发泡，从而解决了这个问题，这使得复合材料的拉伸强度和压缩强度分别提高了57%和15%。该复合材料有潜力用作人造草皮的发泡垫。
