有机硅改性聚氨酯薄膜耐老化性能的研究
发布时间：2018-08-12 14:02
【摘要】：本文以端氨基聚二甲基硅氧烷(PDMS)为硅源,嵌段改性聚醚型聚氨酯。并采用旋涂法制备有机硅改性聚氨酯薄膜。利用自主设计的多环境因素老化实验箱对薄膜进行紫外环境暴露、臭氧环境暴露、紫外和臭氧双因素环境暴露老化实验。通过测试有机硅改性聚氨酯薄膜伴随老化时间延续的红外光谱和紫外可见光谱,研究了其色差和黄色指数的改变规律,分析了有机硅改性聚氨酯薄膜样品的耐老化性能,以及有机硅含量对聚氨酯薄膜耐老化性能的影响,分析了紫外和臭氧双因素环境对纯聚氨酯薄膜和有机硅改性聚氨酯薄膜的老化作用。在紫外环境暴露实验中,有机硅可以有效抑制聚氨酯薄膜的黄变。并且伴随有机硅含量的逐渐增加,改性聚氨酯薄膜的耐黄变性能逐渐提升;随着暴露时间的延长,聚氨酯薄膜在190-400nm的紫外吸光度逐渐增加;有机硅可以有效抑制聚氨酯薄膜的光氧化降解,并且伴随有机硅含量逐渐增大,改性聚氨酯薄膜光氧化降解速率逐渐变慢。在臭氧环境暴露实验中,有机硅可以有效抑制聚氨酯薄膜的黄变。并且伴随有机硅含量的逐渐增加,聚氨酯薄膜的耐黄变性能逐渐提升;有机硅的加入可以有效地抑制聚氨酯薄膜的光氧化降解;伴随有机硅含量逐渐增大,聚氨酯薄膜光氧化降解速率逐渐变慢。在短时间暴露实验过程中,有机硅含量对改性后的聚氨酯薄膜的抗光氧化老化能力影响不大,在长时间暴露实验过程中,有机硅含量越高,改性后的聚氨酯薄膜的抗光氧化老化能力越强。在紫外和臭氧双因素环境暴露实验中,有机硅可以有效抑制聚氨酯薄膜的黄变。并且伴随有机硅含量的逐渐增加,改性聚氨酯薄膜的耐黄变性能逐渐提升;随着暴露时间的延长,各聚氨酯薄膜在190-400nm的紫外吸光度逐渐增加; NH和 C=O伸缩振动峰峰高逐渐增加,峰宽逐渐增大,峰面积逐渐增大;随着有机硅含量增大,改性聚氨酯薄膜光氧化降解速率逐渐变慢。在紫外和臭氧双因素环境暴露实验中,有机硅改性聚氨酯薄膜表现出良好的耐紫外/臭氧老化性能;紫外和臭氧对纯聚氨酯薄膜存在明显的协同老化效应。
[Abstract]:In this paper, Polyether polyurethane was modified by block modification with amino terminated polydimethylsiloxane (PDMS) as silicon source. Silicone modified polyurethane films were prepared by spin coating method. The ultraviolet exposure, ozone exposure, ultraviolet and ozone two-factor environmental exposure tests were carried out by using the self-designed multi-environmental factors aging test box. The changes of color difference and yellow index of organosilicon modified polyurethane film were studied by means of infrared and ultraviolet visible spectra, and the aging resistance of organic silicon modified polyurethane film was analyzed. The effects of organosilicon content on the aging resistance of polyurethane films were analyzed. The aging effects of UV and ozone on pure polyurethane films and silicone modified polyurethane films were analyzed. In UV exposure experiments, silicone can effectively inhibit yellowing of polyurethane films. With the increase of organosilicon content, the yellowing resistance of the modified polyurethane film was improved, and the UV absorbance of the modified polyurethane film in 190-400nm increased with the prolongation of the exposure time. Organic silicon can effectively inhibit the photooxidative degradation of polyurethane films, and with the increase of organic silicon content, the photooxidation degradation rate of modified polyurethane films becomes slower. In ozone exposure experiments, silicone can effectively inhibit the yellowing of polyurethane films. With the increase of organic silicon content, the yellowing resistance of polyurethane film was gradually improved; the addition of organic silicon could effectively inhibit the photooxidation degradation of polyurethane film; with the increase of organic silicon content, The photooxidation degradation rate of polyurethane film is decreasing gradually. During the short exposure test, the content of organosilicon has little effect on the photooxidation resistance of the modified polyurethane film, and the higher the content of organosilicon is during the long time exposure, the higher the content of organic silicon is. The resistance to photooxidation of the modified polyurethane film is stronger than that of the modified polyurethane film. In UV and ozone exposure experiments, silicone can effectively inhibit the yellowing of polyurethane films. With the increase of organosilicon content, the yellowing resistance of the modified polyurethane films was gradually improved, and the yellowing resistance of the modified polyurethane films increased with the increase of exposure time. The UV absorbance of polyurethane films increased gradually in 190-400nm, the peak height and width of the peaks increased, the peak area increased with the increase of organosilicon content, and the peak height and the peak width increased gradually with the increase of organosilicon content. The photooxidation degradation rate of modified polyurethane film was gradually slowed down. In both UV and ozone exposure experiments, silicone modified polyurethane films exhibit good UV / ozone aging resistance, and UV and ozone have obvious synergistic aging effects on pure polyurethane films.
【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】：O633.14;TB383.2
本文编号：2179279
[Abstract]:In this paper, Polyether polyurethane was modified by block modification with amino terminated polydimethylsiloxane (PDMS) as silicon source. Silicone modified polyurethane films were prepared by spin coating method. The ultraviolet exposure, ozone exposure, ultraviolet and ozone two-factor environmental exposure tests were carried out by using the self-designed multi-environmental factors aging test box. The changes of color difference and yellow index of organosilicon modified polyurethane film were studied by means of infrared and ultraviolet visible spectra, and the aging resistance of organic silicon modified polyurethane film was analyzed. The effects of organosilicon content on the aging resistance of polyurethane films were analyzed. The aging effects of UV and ozone on pure polyurethane films and silicone modified polyurethane films were analyzed. In UV exposure experiments, silicone can effectively inhibit yellowing of polyurethane films. With the increase of organosilicon content, the yellowing resistance of the modified polyurethane film was improved, and the UV absorbance of the modified polyurethane film in 190-400nm increased with the prolongation of the exposure time. Organic silicon can effectively inhibit the photooxidative degradation of polyurethane films, and with the increase of organic silicon content, the photooxidation degradation rate of modified polyurethane films becomes slower. In ozone exposure experiments, silicone can effectively inhibit the yellowing of polyurethane films. With the increase of organic silicon content, the yellowing resistance of polyurethane film was gradually improved; the addition of organic silicon could effectively inhibit the photooxidation degradation of polyurethane film; with the increase of organic silicon content, The photooxidation degradation rate of polyurethane film is decreasing gradually. During the short exposure test, the content of organosilicon has little effect on the photooxidation resistance of the modified polyurethane film, and the higher the content of organosilicon is during the long time exposure, the higher the content of organic silicon is. The resistance to photooxidation of the modified polyurethane film is stronger than that of the modified polyurethane film. In UV and ozone exposure experiments, silicone can effectively inhibit the yellowing of polyurethane films. With the increase of organosilicon content, the yellowing resistance of the modified polyurethane films was gradually improved, and the yellowing resistance of the modified polyurethane films increased with the increase of exposure time. The UV absorbance of polyurethane films increased gradually in 190-400nm, the peak height and width of the peaks increased, the peak area increased with the increase of organosilicon content, and the peak height and the peak width increased gradually with the increase of organosilicon content. The photooxidation degradation rate of modified polyurethane film was gradually slowed down. In both UV and ozone exposure experiments, silicone modified polyurethane films exhibit good UV / ozone aging resistance, and UV and ozone have obvious synergistic aging effects on pure polyurethane films.
【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】：O633.14;TB383.2
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