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旨在对低密度聚乙烯蜡进行化学接枝改性,改善其可乳化性能,从而制备高稳定性改性聚乙烯蜡微乳液。首先以丙烯酸作为接枝单体,采用悬浮溶胀接枝法对低密度聚乙烯蜡进行化学接枝改性;然后,通过选取适当的阴离子乳化剂和非离子乳化剂的复配体系,对接枝改性的聚乙烯蜡产物进行乳化。结果表明:采用SDS和Tween80等比例复配,控制乳化温度为90~95℃,乳化剂用量为聚乙烯蜡的10%、乳化时间为30min时,采用相转变乳化法可制得高稳定性的聚乙烯蜡微乳液。采用FTIR对改性聚乙烯蜡进行了结构表征,证明了丙烯酸被成功地接枝到了聚乙烯蜡分子上,并通过DSC分析研究了其熔点和结晶情况的变化:聚乙烯蜡的熔点为102.41℃,丙烯酸接枝改性聚乙烯蜡的熔点为102.85℃;改性聚乙烯蜡与未改性的聚乙烯蜡的比结晶度为77.7%。 相似文献
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The deep reason of severe disaster weather with the relationship among the earth nutation, rotation and atmospheric change is explored based on the effective results about the disaster weather prediction of the long term made by the variation of the earth rotation in near 10 years. It is discussed the relationship between the subtropical anticyclone and subtropical easterlies to aim at the problem of high temperature and drought in the globe, further more, the comparison analysis has been made to the earth nutation and the variation of rotation. The research results show that the reasons of severe disaster weather not only are due to atmosphere itself, but have some variation information of earth movement which could be used for the weather forecast. 相似文献
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金属表面用硅烷处理液的制备工艺及表征 总被引:1,自引:0,他引:1
研究了一种金属表面硅烷化处理液制备工艺,并对该处理液以及经过处理后钢表面薄膜进行了分析和评价。结果表明:此工艺所得硅烷处理液的性能优良,能够在长时间内具有较好的稳定性及防腐效果。这一结果对开展金属表面硅烷化处理以及相应处理液研究均具有参考价值。 相似文献