从VOCs释放和能耗角度分析水性涂料在汽车外饰塑料件涂装领域的应用前景

Application Prospects of Waterborne Coatings for Automotive Exterior Plastic Parts as Viewed from VOCs Release and Energy Consumption

详细调研了汽车外饰塑料件3条溶剂型涂料涂装线和1条水性涂料涂装线的生产运行数据及其使用的供应商涂料配比数据,对2类涂料涂装过程的挥发性有机物(VOCs)释放量和总能耗(生产过程和涂装过程能耗之和)进行了对比。结果表明:涂装过程中使用水性涂料比溶剂型涂料在VOCs释放方面有大幅削减,在末端使用集中热力燃烧装置(RTO)的情况下,2种涂装线的VOCs释放浓度目前均能够达标;而水性涂料比溶剂型涂料的总能耗大约多55%,改用水性涂料后,涂装释放的VOCs削减效果很显著,但其能耗有所增加。因此,水性涂料需要在涂装工序方面进行精简,水性涂料涂装线生产效率的提高也是未来推广水性涂料使用亟待解决的实际问题。

The production and operation data of three solvent- based coating lines and one waterborne coating line for automobile exterior plastic parts and the related suppliers and their coatings formulations are investigated in detail. The VOCs emissions for the two types of coating process and the total energy consumption (the sum of the production process and the coating process) are compared. The results show that the use of waterborne coatings during the coating process significantly reduces VOCs emission compared to sol? vent-based coatings. With the use of regenerative thermal oxidizer (RTO), the VOCs emission concentrations of the two types of coating lines can quailed to the current standard. The total energy consumption of the waterborne coatings was approximately 55% more than that of the solvent-based coatings while the application of waterborne coatings reduces significantly the VOCs emission. Therefore, the coating process of the waterborne coatings needs to be streamlined. The improvement of the coating efficiency of the waterborne coatings is also a practical problem that needs to be solved in the future conducive for further development of the waterborne coatings.