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采用静电喷涂工艺,将硅胶粉和粉末涂料组成的混合物喷涂到铝箔表面,加热固化后进一步浸渍到氯化锂或氯化钙饱和盐溶液中,获得除湿换热器铝箔表面吸湿涂层。对吸湿涂层进行扫描电子显微镜及其能谱、比表面积孔隙分析及热失重等表征。结果表明:涂层能够均匀分散在铝箔表面;改性后的吸湿涂层平均孔径略有增大,孔容和比表面积略有减小;吸湿涂层质量损失主要集中在较低温度段(30～200℃)和较高温度段(300～600℃),前者与吸附剂脱附有关,后者与涂料热分解有关。静态、动态吸附测试表明,改性后吸湿涂层的吸附性能都有较大的改善。
The electrostatic spraying process is adopted to spray a mixture of the silica powder and the powder coating onto the surface of the aluminum foil and further impregnate the saturated salt solution of lithium chloride or calcium chloride after heating and curing to obtain the moisture absorption coating on the surface of the aluminum foil of the dehumidifying heat exchanger. The hygroscopic coatings were characterized by scanning electron microscopy and energy spectrum, pore specific surface area analysis and thermogravimetry. The results show that the coating can be uniformly dispersed on the surface of the aluminum foil. The average pore size of the modified hygroscopic coating slightly increases and the pore volume and specific surface area slightly decrease. The mass loss of the hygroscopic coating mainly concentrates in the lower temperature range ~ 200 ℃) and higher temperature (300 ~ 600 ℃), the former is related to desorption of adsorbent, which is related to the thermal decomposition of paint. Static and dynamic adsorption tests show that the adsorbed properties of modified absorbent coatings are greatly improved.