Lee Jung Joon, Cho Mi Yeon, Kim Bo-Hyun, Lee Sunjong
Research Institute of Sustainable Manufacturing System, Korea Institute of Industrial Technology, Cheonan 31056, Korea.
Materials (Basel). 2018 Oct 4;11(10):1898. doi: 10.3390/ma11101898.
Development of eco-friendly polymer foams is an urgent research topic because of the serious environmental pollution caused by trash heaps and the time-release of harmful gases. Polymer PVC foam using azodicarbonamide as a chemical foaming agent has been highly requested for further improvement due to the residual ammonia gas that continuously leaks out. Here, we demonstrate an effective and costless process for the reduction of releasing ammonia from PVC foams using the overcoat technology of deodorants. We have selected four candidate materials, gelite, zeolite, terra alba, and fumed silica as original materials for the deodorant of ammonia, and they showed an ammonia deodorization rate (ADR) of over 80% without any treatment except the fumed silica. When we over-coated the UV-curing agent mixed deodorants on the PVC foams (thickness ~300 µm), the ADR of the terra alba and zeolite complex foams was remarkably higher than 90%, however, the specific gravity and chromaticity were not changed within 20%. This indicates that our developed process using deodorant layer for ammonia reduction has a high potential for the production of eco-friendly polymer foams.
由于垃圾堆造成的严重环境污染以及有害气体的缓释问题，开发环保型聚合物泡沫是一个紧迫的研究课题。由于持续泄漏的残留氨气，以偶氮二甲酰胺作为化学发泡剂的聚氯乙烯（PVC）聚合物泡沫急需进一步改进。在此，我们展示了一种使用除臭剂外涂层技术减少PVC泡沫中氨气释放的有效且低成本的方法。我们选择了四种候选材料，即白土、沸石、陶土和气相二氧化硅作为氨气除臭剂的原材料，除气相二氧化硅外，它们未经任何处理时的氨气除臭率（ADR）就超过了80%。当我们在PVC泡沫（厚度约300 µm）上涂覆紫外线固化剂混合除臭剂时，陶土和沸石复合泡沫的ADR显著高于90%，然而，比重和色度在20%以内没有变化。这表明我们开发的使用除臭剂层减少氨气的工艺在生产环保型聚合物泡沫方面具有很大潜力。
