Osemeahon Sunday A, Akinterinwa Ayodele, Fasina Esther, Andrew Fartisincha P, Shagal Muhammed H, Kareem Semiu A, Reuben Usaku, Onyebuchi Patience U, Adelagun Olubukola R, Esenowo David
Department of Chemistry, Modibbo Adama University, PMB 2076, Yola, Nigeria.
Department of Science Laboratory Technology, Modibbo Adama University, PMB 2076, Yola, Nigeria.
Heliyon. 2024 Mar 13;10(6):e27868. doi: 10.1016/j.heliyon.2024.e27868. eCollection 2024 Mar 30.
Waste management is fundamental to resource and environmental sustainability. Expanded polystyrene (EPS) and polyurethane (PU) waste plastics were recycled and applied as binder in emulsion paint formulation. The recycled polystyrene (rPS) and polyurethane (rPU) were blended into composite resins, where toluene was used as the solvent. The blends of rPS and rPU were optimized, while some physicochemical properties of the composite blends (rPS/PU) were evaluated. The results showed that the incorporation of rPU into rPS increased the viscosity (1818 mPa-3924 mPa), rate of gelation (dry-to-touch time: 15 min-0.25 min), moisture content (2.7%-8.1%), moisture uptake (3.2%-5.0%), solid content (48%-53.4%) and density (0.82 g/cm to 1.050.82 g/cm) of the rPS/PU composite resins. Characterization was carried out using Fourier transform infrared (FT-IR) spectroscopy, X-ray diffraction (XRD), thermogravimetric analysis (TGA), scanning electron microscope (SEM), and atomic force microscopy (AFM). The results summarily showed that there are interactions among the rPS and rPU molecules in the composite, where complimentary structural and morphological characteristics were also achieved. The composite resin also exhibited superior bond strength (0.5-4.24 Mpa) on wood, cast mortar, ceramic, and steel surfaces due to its stronger intra- and inter-surface interactions compared to the neat rPS resin. The composite resin was used as a binder in the formulation of emulsion paint. The paint exhibited stronger resistance to water, among other superior properties, when compared to the paints formulated using neat rPS and conventional polyvinyl acetate (PVA) resins. The reduction of plastic waste in this study holds potential for the production of highly water-resistant emulsion paint for outdoor and indoor applications.
废物管理是资源和环境可持续性的基础。发泡聚苯乙烯（EPS）和聚氨酯（PU）废塑料被回收，并用作乳胶漆配方中的粘合剂。将回收的聚苯乙烯（rPS）和聚氨酯（rPU）混合成复合树脂，其中甲苯用作溶剂。对rPS和rPU的混合物进行了优化，同时评估了复合混合物（rPS/PU）的一些物理化学性质。结果表明，将rPU加入rPS中会提高rPS/PU复合树脂的粘度（1818 mPa - 3924 mPa）、凝胶化速率（表干时间：15分钟 - 0.25分钟）、水分含量（2.7% - 8.1%）、吸水量（3.2% - 5.0%）、固含量（48% - 53.4%）和密度（0.82 g/cm³至1.050.82 g/cm³）。使用傅里叶变换红外（FT - IR）光谱、X射线衍射（XRD）、热重分析（TGA）、扫描电子显微镜（SEM）和原子力显微镜（AFM）进行了表征。结果总体表明，复合材料中rPS和rPU分子之间存在相互作用，同时还实现了互补的结构和形态特征。与纯rPS树脂相比，复合树脂由于其更强的表面内和表面间相互作用，在木材、铸模砂浆、陶瓷和钢表面也表现出优异的粘结强度（0.5 - 4.24 Mpa）。该复合树脂用作乳胶漆配方中的粘合剂。与使用纯rPS和传统聚醋酸乙烯酯（PVA）树脂配制的涂料相比，该涂料表现出更强的耐水性以及其他优异性能。本研究中塑料废物的减少为生产用于户外和室内应用的高耐水乳胶漆提供了潜力。
