基材润湿剂在水性涂料中的应用研究

Research on the Application of Substrate Wetting Agent in Water-borne Coatings

为综合评估不同结构类型的基材润湿剂在水性涂料中的应用,探讨了硅类及非硅类不同化学结构的基材润湿剂在水溶液中的表面张力、水解稳定性、抑泡性以及应用在水性涂料中的表面张力、初始基材表面润湿效果、热贮存后的基材润湿效果以及抑泡性能。结果表明:不同结构类型的基材润湿剂对水性涂料表面张力(γ_(lg))的影响均小于其对水溶液表面张力(γ_(lg))的影响;基材润湿效果受到水性涂料的表面张力(γ_(lg))和水性涂料与基材间的表面张力(γsl)的影响,基材润湿效果的稳定性由基材润湿剂化学结构决定,不同结构的硅类基材润湿剂均存在不同程度的水解稳定性问题,抗水解稳定的星型聚醚基材润湿剂则相对保持较高的基材润湿效果及稳定性。不同结构基材润湿剂水溶液抑泡性呈现比较大的差别,但在水性涂料中区别并不明显。

The application of different structure types of substrate wetting agents in waterborne coatings was evaluated comprehensively in this paper.The surface tension(γ_(lg)),hydrolytic stability,and bubble inhibition of silicone and non-silicon substrate wetting agents with different chemical structures in aqueous solution,as well as the surface tension(γ_(lg))applied to water-borne coatings,the initial surface wetting effect of the substrate,the wetting effect of the substrate after heat storage,and the influence on the bubble inhibition of the waterborne coating system were discussed.The results showed that the influence of substrate wetting agents with different structure on the surface tension(γ_(lg))of water-borne coatings would be reduced compared with that of aqueous solution.The wetting effect of the substrate would be affected by surface tension(γ_(lg))and surface tension(γsl)of water-borne coatings.The stability of the wetting effect of the substrate would be affected by the chemical structure of the substrate wetting agent.The wetting agents with different structure of silicon substrate indicated different degree of hydrolytic stability problems,while the star polyether substrate wetting agents with anti-hydrolytic stability maintain higher wetting effect and stability.The bubble inhibition of substrate wetting agent aqueous solution with different structure would show great difference,but the difference was not obvious in water-borne coatings.