帘式涂布幕帘稳定性影响因素研究

Study on the Factors Affecting Curtain Stability in Curtain Coating

关键词:  幕帘稳定性  导杆  增稠剂  固含量  颜料配比

Key Words:stability of curtain  guide rod  thickener  solid content  proportion of pigments

摘要:研究了帘式涂布中导杆、增稠剂、涂料固含量、颜料配比对幕帘稳定性的影响。结果表明，增加幕帘与导杆的结合力，可提高幕帘的稳定性；对于没有加入表面活性剂的涂料来说，未加聚乙烯醇（PVA）时的可操作最小流量为1.64 cm2/s，PVA用量为1.5份时的可操作最小流量为3.07 cm2/s；对于加入了表面活性剂的涂料来说，PVA用量为0.5份时的可操作最小流量为1.95 cm2/s，PVA用量为1.5份时的可操作最小流量为1.55 cm2/s；涂料固含量对幕帘稳定性影响有限；高岭土用量为20份时的可操作最小流量为1.92 cm2/s，高岭土用量为40份时的可操作最小流量为2.24 cm2/s。

Abstract:The influences of guide rod, thickener, coatings solid content and pigments formulation of coatings on curtain stability in curtain coating were studied. The results showed that the stability of curtain could be improved by increasing the binding force between coatings and guide rod. For the coatings without surfactant, when PVA dosage was 1.5 parts, the operational minimum flow increase from 1.64 c m²/s to 3.07 c m²/s; for coatings with surfactant, when PVA dosage increased from 0.5 part to 1.5 parts, the operational minimum flow decreased from 1.95 c m²/s to 1.55 c m²/s. Coatings solid content had a little effects on curtain stability. When clay content increased from 20 parts to 40 parts, the operational minimum flow increased from 1.92 c m²/s to 2.24 c m²/s．