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热稳定剂的发展对PVC工业的发展有着巨大的推动作用,而复合钙锌热稳定剂是世界上公认的无毒、环保型热稳定剂,具有极大的应用空间。本文介绍了PVC的热降解机理以及钙锌复合热稳定削的作用机理,阐述了如何应用刚果红法对钙锌复合热稳定剂的热稳定性进行测试,最后分析了钙锌复合热稳定剂的应用以及发展前景。 相似文献
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以钙锌复合稳定剂(Ca-Zn)为稳定剂,对聚偏氯乙烯(PVDC)热稳定体系进行研究,采用刚果红法和热失重法测试了Ca-Zn含量对PVDC热分解脱氯化氢变色温度、变色时间以及热失重的影响。结果表明:纯PVDC受热后易分解,含4质量份Ca-Zn的PVDC,其刚果红试纸初始变色温度和完全变色温度与纯PVDC相比分别提高了18℃和24℃,试纸初始变色时间和完全变色时间分别延长了199s和804s,恒温热失重质量损失率降低了36.2%,等速升温热失重初始分解温度和最大速率峰对应温度分别提高了58.5℃和60℃,热分解温度和热稳定性大幅度提高。 相似文献
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The results of the evaluation of zinc maleate and zinc anthranilate as thermal stabilizers for poly(vinyl chloride) (PVC) are reported in this article. Calcium stearate, diphenyl isodecyl phosphite, and epoxidized soya oil were used as costabilizers. Both zinc compounds showed good stabilizing performance in static and dynamic tests, particularly at low concentrations. The best results were obtained with zinc anthranilate. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 77: 2603–2605, 2000 相似文献
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Two novel thermal stabilizers, zinc and calcium oxolinic complexes (Zn(Oxo)2 and Ca(Oxo)2), with superior tensile properties and notable thermal stability effect for polyvinyl chloride (PVC) are reported here. The complexes are synthesized without any organic solvents, and the structures are confirmed as Zn(C13H10NO5)2·H2O and Ca(C13H10NO5)2·3H2O by Fourier transform infrared spectroscopy, thermogravimetric analysis, X-ray fluorescence spectrometry, and elemental analysis. The PVC samples stabilized with the complexes show superior tensile strength and elongation at break compared with zinc and calcium stearates by tensile test. The results of Congo red test, dehydrochlorination test, and discoloration test show that: (1) Zn(Oxo)2 is better than zinc stearate as thermal stabilizer for PVC; (2) Zn(Oxo)2 and Ca(Oxo)2 show notable synergistic effect with calcium stearate and zinc norfloxacin respectively. The mechanism of the superior tensile properties and notable thermal stability effect is due to the ability of the complexes to absorbing HCl and reacting with PVC chains, which result in the special chain extension of PVC and the delay of autocatalytic effect and zipper-like dehydrochlorination. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136, 47004. 相似文献
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在无需催化剂的条件下用马来酸酐与十二醇反应制得了马来酸单十二酯中间体,经过皂化反应和复分解反应制备了聚氯乙烯(PVC)用热稳定剂马来酸单十二酯钙/锌,利用紫外吸收光谱和傅立叶变换红外光谱对中间体和最终产物进行了验证;通过热老化烘箱法、刚果红法、电导率法对添加马来酸单十二酯钙/锌复配体系的PVC热稳定性能进行了系统评价,并在热稳定性能和力学性能方面与添加传统硬脂酸钙/锌的PVC进行了对比。结果表明,马来酸单十二酯钙/锌复配后表现出良好的协同热稳定作用,能够有效地抑制PVC试样的初期着色和降解,使PVC的热稳定时间大幅增加,延长了PVC开始释放HCl的时间;马来酸单十二酯钙/锌的最佳复配质量比为3∶1。与添加硬脂酸钙/锌复配体系的PVC相比,相同条件下添加马来酸单十二酯钙/锌复配体系的PVC热稳定性能更优,且拉伸性能相差不大,表明制备的马来酸单十二酯钙/锌可以取代传统硬脂酸钙/锌应用于PVC体系中。 相似文献