Eakvanich Visit, Lakachaiworakun Putipong, Rachsiriwatcharabul Natworapol, Wattana Wassachol, Kalasee Wachara, Dangwilailux Panya
Department of Engineering, King Mongkut's Institute of Technology Ladkrabang, Chumphon Campus, Chumphon 86160, Thailand.
Department of Sustainable Industrial Management Engineering, Faculty of Engineering, Rajamangala University of Technology Phra Nakhon, Bangkok 10800, Thailand.
Polymers (Basel). 2025 Jun 20;17(13):1718. doi: 10.3390/polym17131718.
Occupational exposure to commercial formic and acetic acids through dermal contact and inhalation during rubber sheet processing poses significant health risks to workers. Additionally, the use of these acids contributes to environmental pollution by contaminating water sources and soil. This study investigates the potential of three types of wood vinegar-derived from para-rubber wood, bamboo, and eucalyptus-obtained through biomass pyrolysis under anaerobic conditions, as sustainable alternatives to formic and acetic acids in the production of ribbed smoked sheets (RSSs). The organic constituents of each wood vinegar were characterized using gas chromatography and subsequently mixed with fresh natural latex to produce coagulated rubber sheets. The physical and chemical properties, equilibrium moisture content, and drying kinetics of the resulting sheets were then evaluated. The results indicated that wood vinegar derived from para-rubber wood contained a higher concentration of acetic acid compared to that obtained from bamboo and eucalyptus. As a result, rubber sheets coagulated with para-rubber wood and bamboo vinegars exhibited moisture sorption isotherms comparable to those of sheets coagulated with acetic acid, best described by the modified Henderson model. In contrast, sheets coagulated with eucalyptus-derived vinegar and formic acid followed the Oswin model. In terms of physical and chemical properties, extended drying times led to improved tensile strength in all samples. No statistically significant differences in tensile strength were observed between the experimental and reference samples. The concentration of acid was found to influence Mooney viscosity, the plasticity retention index (PRI), the thermogravimetric curve, and the overall coagulation process more significantly than the acid type. The drying kinetics of all five rubber sheet samples displayed similar trends, with the drying time decreasing in response to increases in drying temperature and airflow velocity.
在橡胶片加工过程中，通过皮肤接触和吸入职业性暴露于商业用甲酸和乙酸会对工人构成重大健康风险。此外，这些酸的使用会因污染水源和土壤而造成环境污染。本研究调查了通过生物质在厌氧条件下热解获得的三种源自橡胶木、竹子和桉树的木醋液作为肋状烟熏片（RSS）生产中甲酸和乙酸的可持续替代品的潜力。使用气相色谱对每种木醋液的有机成分进行了表征，随后将其与新鲜天然乳胶混合以生产凝固橡胶片。然后评估了所得橡胶片的物理和化学性质、平衡水分含量及干燥动力学。结果表明，与从竹子和桉树获得的木醋液相比，源自橡胶木的木醋液中乙酸浓度更高。因此，用橡胶木和竹醋液凝固的橡胶片表现出与用乙酸凝固的橡胶片相当的吸湿等温线，用修正的亨德森模型能最好地描述。相比之下，用桉树木醋液和甲酸凝固的橡胶片遵循奥斯温模型。在物理和化学性质方面，延长干燥时间会提高所有样品的拉伸强度。在实验样品和参比样品之间未观察到拉伸强度有统计学显著差异。发现酸的浓度比酸的类型对门尼粘度、塑性保持指数（PRI）、热重曲线和整体凝固过程的影响更显著。所有五个橡胶片样品的干燥动力学呈现相似趋势，干燥时间随干燥温度和气流速度的增加而减少。
Zotero 插件
