如果需要平衡相当大的表面张力差异,可以使用聚硅氧烷。根据其化学结构,它们可以大大降低液态涂料的表面张力。 因此,它们可以优先用于改善基材润湿,并作为防缩孔的助剂。由于与涂料体系有合适的不相容性,聚硅氧烷也有消泡剂的作用。此外,有机硅助剂还可以改善固化漆膜的表面滑爽,从而有助于改善划痕和抗粘连性。
聚丙烯酸酯只能平衡小的表面张力差,不降低或轻微降低液体涂层的表面张力。
它们主要用于改善流平。然而,具有合适的的不相容性,这些产品也可表现出消泡性能。此外,也有一组具有表面活性的低分子量表面活性剂,可用于降低表面张力,因为它们具有像表面活性剂一样典型的两性结构(极性/非极性)。
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