有机添加剂对脂环族聚醚型聚氨酯薄膜耐光氧老化性能影响

发布时间：2018-04-16 07:43

本文选题：脂环族聚醚型聚氨酯 + 有机添加剂　；参考：《燕山大学》2015年硕士论文

【摘要】：本论文选用有机紫外吸收剂UV-326、受阻胺HALS-622和抗氧剂AO-1010为添加剂,分别添加到脂环族聚醚型聚氨酯薄膜(异佛尔酮二异氰酸酯为硬段,聚四氢呋喃醚二醇为软段)中,采用本课题组自行研制的紫外/臭氧综合一体化老化装置对薄膜进行紫外、臭氧和紫外/臭氧综合环境的暴露实验。测试薄膜在不同暴露时间的红外光谱、紫外可见光谱、热重分析、色差和黄色指数,考察脂环族聚氨酯薄膜的耐老化性能及有机添加剂对聚氨酯薄膜耐老化性能的影响。研究结果表明:在紫外、臭氧和紫外/臭氧综合环境暴露实验中,各薄膜的色差、黄色指数和UV-vis光谱中的-C=O吸光度均随老化时间延长而增加。红外光谱显示, NH和 C=O峰均逐渐变宽,α/β-CH2峰和C O-C峰,以及 NH键与C N键的耦合峰均逐渐减弱。在单紫外条件下,有机紫外吸收剂UV-326对提高聚氨酯薄膜的耐老化性能具有显著的效果;在单臭氧条件下,抗氧剂AO-1010对提高聚氨酯薄膜的耐老化性能具有显著效果;在紫外/臭氧综合条件下,单一有机添加剂对提高聚氨酯薄膜的耐老化性能效果不明显。本文利用傅里叶红外变换光谱定量分析了脂环族聚醚型聚氨酯的光氧氧化行为,并对其光氧氧化降解机理进行了探讨。进一步对聚醚型聚氨酯结构的降解方式和降解产物进行了分析。老化前后对比分析说明,该类型聚氨酯中软段发生光氧化降解的主要原因是聚醚基团高度的光化学灵敏性。醚官能团氧化生成甲酸盐,甲酸盐进一步氧化生成乙烯和甲酸甲酯,并且重新生成甲酸盐,直到整个醚官能团降解完全。硬段降解的主要原因是氨基甲酸酯基团发生-C-N键和-C-O键的断裂,以及氨基甲酸酯中-NH位置的α-CH2发生氧化。
[Abstract]:In this paper, organic ultraviolet absorber UV-326, hindered amine HALS-622 and antioxidant AO-1010 were used as additives, respectively, to add aliphatic polyether polyurethane film (isophorone diisocyanate as hard segment, polytetrahydrofuranediol as soft segment).The ultraviolet, ozone and ultraviolet / ozone comprehensive environment exposure experiments were carried out with the UV / ozone integrated aging device developed by our team.The infrared spectra, UV-Vis spectra, thermogravimetric analysis, color difference and yellow index of the films at different exposure time were measured. The aging resistance of the films and the effects of organic additives on the aging resistance of the films were investigated.The results show that the chromatic aberration, yellow index and Ca-O absorbance in UV-vis spectra increase with the aging time in the UV, ozone and UV / ozone exposure experiments.The IR spectra show that the peaks of NH and Con O gradually widen, and the peaks of 伪 / 尾 -CH2 and C-O -C, as well as the coupling peaks of NH bond and C-N bond decrease gradually.Under the condition of single ultraviolet, organic ultraviolet absorbent UV-326 has remarkable effect on improving the aging resistance of polyurethane film, and antioxidant AO-1010 has remarkable effect on improving the aging resistance of polyurethane film under the condition of single ozone.Under the condition of UV / ozone synthesis, the effect of single organic additive on improving the aging resistance of polyurethane film is not obvious.In this paper, the photooxidation behavior of aliphatic polyether polyurethane was quantitatively analyzed by Fourier transform infrared spectroscopy, and the photooxidative degradation mechanism was discussed.The degradation methods and degradation products of polyether polyurethane structure were further analyzed.The comparative analysis before and after aging shows that the photochemical sensitivity of polyether group is the main reason of photooxidation degradation in soft segment of this type of polyurethane.The ether functional group was oxidized to formate and the formate was further oxidized to form ethylene and methyl formate and the formate was regenerated until the whole ether functional group was completely degraded.The main causes of hard segment degradation are the breaking of -C-N bond and -C-O bond of carbamate group and the oxidation of 伪 -CH2 in the position of -NH in carbamate.
【学位授予单位】：燕山大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TQ317;TB383.2

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