Structural modification of waste cooking oil methyl esters as cleaner plasticizer to substitute toxic dioctyl phthalate
Structural modification of waste cooking oil methyl esters as cleaner plasticizer to substitute toxic dioctyl phthalate
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DOI：
10.1016/j.jclepro.2018.03.175
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发表时间：
2018-06
影响因子：
11.1
通讯作者：
Ting Zheng;Wu Zhenyu;Xie Qinglong;Jiaojiao Fang;Yunchen Hu;Meizhen Lu;Xia Fan;Nie Yong
中科院分区：
文献类型：
--
作者：
Ting Zheng;Wu Zhenyu;Xie Qinglong;Jiaojiao Fang;Yunchen Hu;Meizhen Lu;Xia Fan;Nie Yong
聚氯乙烯加工过程中使用的大多数增塑剂通常是有毒的石油基邻苯二甲酸酯。此外，大量的食用油成为世界各地的废物，幸运的是，废食用油有潜力成为合成不同生物材料的经济替代品。本研究旨在以废弃食用油甲酯为起始原料，合成一种性能优良、成本具有竞争力的清洁型生物增塑剂。本文对废食用油甲酯进行了结构改性，酯交换和环氧化反应，制备环氧废弃食用油2-乙基己基酯。采用响应面分析法研究了该反应的最佳条件：反应时间为7 h，C双键/FA/H2 O2的摩尔比为1.00/0.35/2.41，反应温度为65.84 °C，环氧乙烷的最大相对转化率为92%。研究了环氧废弃食用油2-乙基己基酯替代有毒增塑剂邻苯二甲酸二辛酯的增塑效果。结果表明，部分取代可显著提高PVC的力学性能和热性能，但抗迁移性能略有下降。与常规环氧化合物相比，环氧废油2-乙基己酯具有上级的低温性能、氧化稳定性，并显著降低了PVC的玻璃化转变温度。结果表明，以废食用油甲酯为原料，通过结构改性制备的环氧化合物是邻苯二甲酸二辛酯的有效替代物，可替代约40%的增塑剂。这可能导致废弃食用油材料的生态发展，并使塑化过程更加环保。
Most of the plasticizers used during poly (vinyl chloride) processing are typically toxic petroleum-based phthalates. Furthermore, large amount of edible oils become waste all over the world, fortunately, waste cooking oils have the potential to be an economic alternative for synthesizing different biomaterials. This study aimed to synthesis an improved properties and cost competitiveness cleaner bio-plasticizer using waste cooking oil methyl esters as staring raw materials. In this paper, waste cooking oil methyl esters were structurally modified i.e., transesterification and epoxidation reaction, to prepare epoxide waste cooking oil 2-ethylhexyl esters. Thein-situepoxidation was mainly studied by response surface methodology, with optimum conditions: reaction time was 7 h, molar ratio of Cdouble bondC bonds/FA/H2O2was 1.00/0.35/2.41, and reaction temperature was 65.84 °C with a maximum relative percentage conversion to oxirane of 92%. Also, the plasticizing effectiveness of epoxide waste cooking oil 2-ethylhexyl esters to substitute toxic plasticizer dioctyl phthalate were studied. Results showed that the mechanical and thermal performance of PVC samples was significantly improved with partial substitutions, while the migration resistance was slightly decreased. Comparison with conventional epoxy compound highlighted that epoxide waste cooking oil 2-ethylhexyl esters had superior low temperature property, oxidation stability, and remarkably reduced the glass transition temperature of PVC. In conclusion, the prepared epoxide via structural modification from waste cooking oil methyl esters proved to be an effective alternative to dioctyl phthalate, replacing about 40% of the total plasticizer. This may lead to the eco-development of waste cooking oil materials, and makes the plasticizing process more environmentally friendly.