用PET瓶后解聚中间体合成PET基聚氨酯改性醇酸树脂:涂层性能和热行为

IF 2.3 4区 材料科学 Q2 Chemistry Journal of Coatings Technology and Research Pub Date : 2022-12-16 DOI:10.1007/s11998-022-00705-y
Ferda Civan Çavuşoğlu, Işıl Acar
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引用次数: 1

摘要

以消费后的聚对苯二甲酸乙酯(PET)瓶与二丙二醇(DPG)和水同时水解-糖酵解反应得到的解聚中间体为原料,合成了聚氨酯改性醇酸树脂。为此,首先以塔尔油脂肪酸(TOFA)、三甲基丙烷(TMP)、邻苯二酸酐(PA)和二丙二醇(DPG)为原料,合成了含油量为50%的四组分醇酸基准树脂。在相同的反应条件下,使用不同数量和类型的纯化和分馏解聚中间体(不水溶性部分WIF和水溶性结晶部分WSCF)合成了pet基醇酸树脂。在pet基醇酸树脂的合成中,部分或全部使用解聚中间体代替醇酸树脂配方中的二酸和/或二醇组分。为了确定聚氨酯改性醇酸树脂合成的最佳改性比,将参考醇酸树脂与甲苯二异氰酸酯(TDI)以不同的摩尔比(NCO/OH: 1/ 1,1 /2和1/3)反应,根据表面涂层性能确定最佳NCO/OH比为1/1。然后,将pet基醇酸树脂与TDI按最佳配比进行改性反应,制备出所有pet基聚氨酯改性醇酸树脂。在研究结束时,我们观察到废弃PET中间体(WIF或WSCF)的使用对物理/化学表面涂层和热性能没有任何负面影响;相反,某些性能优于参比树脂。综上所述,pet基聚氨酯改性醇酸树脂可以作为一种廉价、环保、相对经济的合成涂料粘结剂组分。在合成聚氨酯改性醇酸树脂时,使用一定量的废PET中间体代替二元酸和/或二元醇组分,既降低了原料成本,又通过对回收PET的再评价有利于环境。因此,它既可以回收消费后的PET瓶,这是一种有价值的废物,也可以提供廉价的原材料,而不影响其涂料配方的特性。这些结果在可持续性和废物管理方面是显着的,此外对经济和油漆行业也很重要。
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Synthesis of PET-based urethane-modified alkyd resins from depolymerization intermediates of post-consumer PET bottles: coating properties and thermal behaviors

Urethane-modified alkyd resins were synthesized using the depolymerization intermediates obtained from simultaneous hydrolysis–glycolysis reactions of post-consumer poly(ethylene terephthalate) (PET) bottles with dipropylene glycol (DPG) and water. For this aim, first, the synthesis of a four-component reference alkyd resin having an oil content of 50% was synthesized by using tall oil fatty acid (TOFA), trimethylolpropane (TMP), phthalic anhydride (PA), and dipropylene glycol (DPG). The PET-based alkyd resins were also synthesized using different amounts and types of purified and fractionated depolymerization intermediates (water-insoluble fraction, WIF, and water-soluble and crystallizable fraction, WSCF) under the same reaction conditions. For the synthesis of PET-based alkyd resins, the depolymerization intermediates were used partially or completely instead of dibasic acid and/or diol components in alkyd resin formulations. In order to determine the optimum modification ratio for urethane-modified alkyd resin synthesis, the reference alkyd resin was reacted with toluene diisocyanate (TDI) at different molar ratios (NCO/OH: 1/1, 1/2, and 1/3), and the optimum NCO/OH ratio was determined as 1/1, according to the surface coating properties. And, then, all PET-based urethane-modified alkyd resins were prepared by the modification reactions of the PET-based alkyd resins with TDI at an optimum ratio. At the end of the study, it was observed that the use of waste PET intermediates (WIF or WSCF) did not cause any negative effects on physical/chemical surface coating and thermal properties; on the contrary, some properties were obtained as superior than that of the reference resin. In conclusion, it seems possible to use PET-based urethane-modified alkyd resin could be used as a cheap, environmentally friendly, and relatively economic binder component in synthetic paint formulations. In the synthesis of urethane-modified alkyd resin, using a certain amount of waste PET intermediate instead of dibasic acid and/or diol component will reduce raw material costs and also benefit the environment by re-evaluation of recycled PET. Thus, it could be both possible to recycle of post-consumer PET bottles, which are a valuable waste, and to provide cheap raw materials without compromising its features for paint formulations. These results are remarkable in terms of sustainability and waste management besides are also important for the economy and paint industry.

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来源期刊
Journal of Coatings Technology and Research
Journal of Coatings Technology and Research CHEMISTRY, APPLIED-MATERIALS SCIENCE, COATINGS & FILMS
CiteScore
4.40
自引率
8.70%
发文量
0
期刊介绍: Journal of Coatings Technology and Research (JCTR) is a forum for the exchange of research, experience, knowledge and ideas among those with a professional interest in the science, technology and manufacture of functional, protective and decorative coatings including paints, inks and related coatings and their raw materials, and similar topics.
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