阻燃疏水PET制备及性能
康菡子，王彦博，袁璐璇，蒋文伟
四川大学化学工程学院，成都 610207
Preparation and Properties of Flame-retardant Hydrophobic PET
Kang Hanzi, Wang Yanbo, Yuan Luxuan, Jiang Wenwei
College of Chemical Engineering, Sichuan University, Chengdu 610207, China
摘要：通过回收废旧聚对苯二甲酸乙二酯(PET)制得对苯二甲酸(PTA)，采用PTA、正辛基三甲氧基硅烷、2-羧乙基苯基次磷酸(CEPPA)和乙二醇(EG)进行共聚，制得阻燃疏水改性PET。通过傅立叶变换红外光谱、X射线光电子能谱、热失重分析、极限氧指数(LOI)测试以及接触角测试对改性PET的结构、热稳定性、阻燃性能以及疏水性能进行研究。结果表明，该方法不仅有效地实现了废旧PET的回收利用，而且由于正辛基三甲氧基硅烷和CEPPA实现了PET的阻燃疏水共聚改性，成功制得了高附加值产品。由于磷硅协同阻燃作用，改性PET的阻燃性能提高，LOI由21.1%提高至25.6%，最大质量变化速率降低，由32.01%/min降低至30.48%/min，基体的分解速率延缓；改性PET的接触角由91.0°提高至128.9°，表明正辛基三甲氧基硅烷显著提高了PET的疏水性能。
Abstract：Terephthalic acid (PTA) was produced by recycling waste polyethylene terephthalate (PET), and flame-retardant hydrophobic PET was obtained by copolymerization of PTA, N-octyl trimethoxy silane, 2-carboxyethyl phenyl phosphinic acid (CEPPA) and ethylene glycol (EG). The structure, thermal stability, flame retardancy and hydrophobic properties of the modified PET were studied by Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, thermogravimetric analysis, limiting oxygen index test and contact angle test. The results show that the method not only effectively realizes the recycling of waste PET, but also realizes the flame-retardant hydrophobic copolymerization modification of PET through N-octyl trimethoxy silane and CEPPA, and successfully produces high value-added products. Under the synergistic flame-retardant effect of phosphorous and silicon, the flame-retardant performance of modified PET is improved, the limiting oxygen index increases from 21.1% to 25.6%, the maximum mass change rate of PET is reduced from 32.01%/min to 30.48%/min, and the decomposition of the matrix speed is delayed. The contact angle of modified PET increases from 91.0° to 128.9°, indicating that N-octyl trimethoxy silane significantly improves the hydrophobic properties of PET.
关键词：废旧聚对苯二甲酸乙二酯；共聚；改性；阻燃性；疏水性
Keywords：waste polyethylene terephthalate; copolymerization; modification; flame retardancy; hydrophobicity
本文引用格式：
康菡子，王彦博，袁璐璇，等.阻燃疏水PET制备及性能[J].工程塑料应用，2021，49(2)：40-44.
Kang Hanzi，Wang Yanbo，Yuan Luxuan，et al. Preparation and properties of flame-retardant hydrophobic PET[J]. Engineering Plastics Application，2021，49(2)：40-44.
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