涂料中VOC的散发与残留研究

发布时间：2018-01-03 01:25

  本文关键词：涂料中VOC的散发与残留研究　出处：《浙江大学》2015年硕士论文　论文类型：学位论文

  更多相关文章： 涂料 VOC 残留含量 检测方法

【摘要】：涂料散发VOC是室内环境污染的重要来源。近年来,虽然更为环保的水性漆的推广使得油性漆的使用频率降低,但水性漆也不能做到真正“零污染”。国内外学者的研究主要集中在湿漆膜VOC的散发上,并未关注干漆膜中VOC的残留检测及其对后续室内污染的影响。基于此,本文展开了影响漆膜VOC残留含量的影响因素和残留含量测定方法等的研究。 以重力法和环境小室法进行空间内湿漆膜散发实验,结果发现,漆膜厚度、环境湿度、含水量和VOC的挥发性都能对漆膜残留有不同程度的影响。湿漆膜的干化由散发控制阶段向内部扩散控制阶段转变,漆膜厚度在进入扩散控制阶段后才开始对残留含量产生影响,表现为漆膜越厚,残留含量越高。最后,慢挥发型(挥发压较低)VOC在漆膜干化后的有更多的残留,而易挥发的苯系物则很容易在油漆干化过程中散发完毕。说明研究水性涂料的长期散发应当更关注挥发压较低的VOC。。 观察乳胶漆湿膜在微池小室中的VOC浓度随时间变化。用理论估算残留和空白添加实验对甲醇萃取和微池热萃取法用于干漆膜残留含量检测进行了比较。微池热萃取法取得了和理论值相当的萃取量,甲醇萃取法有良好的平行性和回收率。 气液平衡特性曲线是湿涂料散发的一个重要参数。本研究设计了6.76L的不锈钢小室,并尝试用手持式光离子VOC检测仪对小室内丙二醇水溶液进行气相热平衡进行快速测定,得到26℃下丙二醇的蒸汽压为16.2Pa(0.1216mmHg)和亨利常数为7.48×106。这两数据与文献结果相符合,证明了方法的可行性。 文章最后对主要工作进行了总结,分析了存在的不足以及对后续研究的展望。
[Abstract]:Coating VOC is an important source of indoor environmental pollution. In recent years, although the more environmentally friendly water-based paint has been widely used, the use frequency of oil paint has been reduced. However, water-based lacquer can not achieve real "zero pollution". The research of domestic and foreign scholars mainly focuses on the distribution of wet film VOC. No attention has been paid to the detection of VOC residue in dry paint film and its influence on indoor pollution. Based on this, the factors affecting the residual content of VOC in paint film and the determination method of residual content were studied in this paper. The wet film distribution experiments were carried out by gravity method and environmental chamber method. The results showed that the film thickness and environmental humidity were obtained. The moisture content and the volatility of VOC can affect the film residue in varying degrees. The drying of wet paint film changes from the stage of emission control to the stage of internal diffusion control. After entering the diffusion control stage, the thickness of the paint film began to affect the residual content, which showed that the thicker the film, the higher the residual content. Finally. Slow volatilization (low volatile pressure) VOC has more residue after film drying. The volatile benzenes are easily distributed in the drying process of the paint. It shows that the study of the long-term emission of water-based coatings should pay more attention to VOC.whose volatile pressure is lower. The VOC concentration of wet film of latex paint in microcell chamber was observed with time. The methanol-extraction method and micro-cell thermal extraction method were used to detect the residual content of dry paint film by theoretical estimation and blank addition experiments. The extraction amount obtained by the pool thermal extraction method is equivalent to the theoretical value. Methanol extraction has good parallelism and recovery. The gas-liquid equilibrium characteristic curve is an important parameter of wet coating emission. A 6.76L stainless steel chamber was designed in this study. A portable VOC detector was used to determine the gas phase thermal equilibrium of propylene glycol aqueous solution in a small room. The vapor pressure of propanediol at 26 鈩，

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