Chemical recycling bisphenol A type epoxy resin based on degradation in nitric acid

2003 EcoDesign 3rd International Symposium on Environmentally Conscious Design and Inverse Manufacturing Pub Date : 1900-01-01 DOI:10.1109/ECODIM.2003.1322687

K. Dilafruz, M. Kubouchi, W. Dang, H. Sembokuya, K. Tsuda

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引用次数: 3

Abstract

The method for recycling of bisphenol A type epoxy resin based on degradation in nitric acid was investigated. It examined chemical recycling of bisphenol A type epoxy resin cured with 1,8-menthandiamine. The immersion temperature was controlled at 80 degrees C in 4M and 6M nitric acid and three kinds of products were recovered. Size exclusion chromatography and FT-IR analysis were conducted to investigate the molecular weight distributions and chemical structures of the recovered products. The results of these analyses showed that the extract possessed high yield and was employed for repolymerizing process. To prepare recycled resin the same bisphenol A type epoxy resin and the curing agent phthalic anhydride were chosen. Neutralized extract was added to this epoxy system, then the mechanical properties and thermal properties were evaluated and compared with virgin resin. The results obtained from the differential scanning colorimeter (DSC) and three-point bending test showed that the recycled resin has much higher glass transition temperature (Tg) and mechanical strength. It was concluded that recycled resin formed a better network structure and mechanical strength than virgin resin.

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基于硝酸降解的化学回收双酚A型环氧树脂

研究了基于硝酸降解法回收双酚A型环氧树脂的方法。研究了1,8-氨基二胺固化双酚A型环氧树脂的化学回收。将浸泡温度控制在80℃，在4M和6M的硝酸中，回收了3种产品。采用粒径排斥色谱法和红外光谱分析研究了回收产物的分子量分布和化学结构。结果表明，该萃取物收率高，可用于再聚合。选用同种双酚A型环氧树脂和固化剂邻苯二酸酐制备再生树脂。将中和后的萃取物加入到该环氧体系中，对其力学性能和热性能进行了评价，并与原树脂进行了比较。差示扫描比色仪(DSC)和三点弯曲试验结果表明，再生树脂具有较高的玻璃化转变温度(Tg)和机械强度。结果表明，再生树脂具有较好的网状结构和机械强度。

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2003 EcoDesign 3rd International Symposium on Environmentally Conscious Design and Inverse Manufacturing

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