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首页> 外文期刊>Building and Environment >Multi-layered approach to determine diffusion coefficients through polymer films: Estimating the biocide release from paints
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Multi-layered approach to determine diffusion coefficients through polymer films: Estimating the biocide release from paints

机译：确定通过聚合物膜的扩散系数的多层方法：估算涂料中杀菌剂的释放量

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摘要

Biocides - added to facade coatings like paints and renders to reduce microbial growth on the outer surfaces of buildings - are known to leach into the environment, when the facades are getting in contact with rainwater. The leaching process is described as diffusion controlled process. Nevertheless, no comprehensive data on diffusion coefficients is available so far. The present study aimed for determining the diffusion coefficients in paint of eight biocides, applying an easy, reproducible method. The study was performed using a paint closely related to commercially available paints. It suggests a new method to determine diffusion coefficients in paint films by submerging paint films consisting of several layers with water for 1 h intervals over a period of 30 h. By determining the biocide concentrations in the water after the contacting time, the mass flow of biocides across the paint film was calculated. The resulting diffusion coefficients varied from (0.27 +/- 0.07).10(-15)m(2) s(-1) for Cybutryn to (11.97 +/- 3.14).10(-15)m(2) s(-1) for Diuron.
机译：当外墙与雨水接触时，杀菌剂会添加到外墙涂料（如油漆）中，并减少建筑物外表面的微生物生长，因此会渗入环境。浸出过程称为扩散控制过程。然而，到目前为止，尚无关于扩散系数的全面数据。本研究旨在确定一种八种杀菌剂在涂料中的扩散系数，采用一种易于复制的方法。该研究是使用与市售油漆密切相关的油漆进行的。它提出了一种新的方法来确定漆膜中的扩散系数，方法是在30小时内将由几层组成的漆膜用水浸没1 h间隔。通过确定接触时间后水中杀生物剂的浓度，可以计算出整个涂膜中杀生物剂的质量流量。所得的扩散系数从Cybutryn的（0.27 +/- 0.07）.10（-15）m（2）s（-1）到（11.97 +/- 3.14）.10（-15）m（2）s（ -1）对于Diuron。

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