Maolin Xu,Chengyang Cao,Hongyun Hu,Yang Ren,Guangzhao Guo,Lifang Gong,Junwei Zhang,Tong Zhang,Hong Yao
With the massive production and discard of PVC artificial leather, it is urgently needed to find an efficient and environment-friendly method to dispose of this material made from PVC and blended cloth (BC). As a widely accepted way to dispose of municipal solid waste, pyrolysis was chosen for this study. The pyrolysis experiments of PVC, BC, and their mixture were conducted to characterize PVC artificial leather’s pyrolysis behavior and product characteristics. TG-FTIR and kinetics analysis showed the strong synergistic effect between PVC and cellulose in BC occurred at 240 °C – 314 °C, resulting in cellulose dehydration and aromatization. An exceptionally high tar yield of 54.96 wt% was obtained by fast pyrolysis of the mixture at 500 °C. GC–MS analysis of tar proved BC consisted of cellulose, PET, and PA. The high tar yield of co-pyrolysis came from the synergistic effects of PVC on cellulose and PET, both of which formed terephthalic acid, di(2-chloroethyl) ester (TADE). At 500 °C, the tar of the mixture mainly contained TADE (18.72 wt%), terephthalic acid (18.56 wt%), and aromatics (19.04 wt%). The co-pyrolysis interaction mechanism at 500 °C was deduced. Our study could provide theoretical guidance for recycling PVC artificial leather waste.
Zonglin He,Zhenhong Huang,Jiahui Chen,Ansheng Chen,Jiaoyan Ai,Lina Song,Baohua Liu
Poly (propylene carbonate) diol (PPCD) is one of the most attractive CO 2 copolymers. PPCD-based polyurethane has excellent mechanical properties and hydrophilicity, and is widely used in various fields. However, poor alkali resistance limits the application of PPCD-based polyurethane in wet-type artificial leather (WPL). In order to solve this problem, polyurethane solution (PUS) for wet-type artificial leather was prepared by using PPCD and polytetramethylene ether glycol (PTMG) as soft segments. The chemical structure, viscosity, molecular weight and distribution, physical and mechanical properties, thermal properties and dynamic mechanical thermal properties of PUS were characterized. The changes of the physical and mechanical properties of PUS films and surface morphology of WPLs after soaking in 10 wt% NaOH solution at room temperature for 24 h were studied, so as to evaluate the alkali resistance of polyurethane. The retention of tensile strength and tearing strength of PUS films modified by PTMG increased from 80% to 96% and from 89% to 100%, respectively. The scanning electron microscopy results showed that appropriate PTMG was beneficial to the formation of microporous structure for CO 2 -based polyurethane leather. The leather without PTMG showed agglomeration phenomenon, the micropores were not obvious, and the changes were obvious after soaking in alkali solution. After being modified by PTMG, the morphology of leather after soaking in alkali solution was basically unchanged. Polyurethane leather prepared with PTMG and PPCD as soft segments has excellent alkali resistance. These results suggest that PPCD could be a potential artificial leather material.
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