标题:
有机硅改性水性UV聚氨酯的合成与性能The Synthesis and Properties of UV Curable Waterborne Po-lyurethane Modified by Organosilicon
作者:
李文渊, 曹有名, 周心其
关键字:
紫外光固化, 水性聚氨酯, 改性, 有机硅, 涂料UV Curable; Waterborne Polyurethane; Modification; Organosilicon; Coating
期刊名称:
《Hans Journal of Chemical Engineering and Technology》, Vol.2 No.3, 2012-07-26
摘要:
以甲苯二异氰酸酯(TDI)、聚乙二醇1000(PEG1000)、双羟甲基丙酸(DMPA)、甲基丙烯酸羟乙酯(HEMA)等为原料，制备出UV固化的水性聚氨酯涂料(UV-WPU)，同时用3-氨丙基三乙氧基硅烷进行改性；研究了DMPA用量、有机硅用量、中和度等对乳液黏度和涂膜吸水率的影响；采用红外光谱对聚氨酯结构进行了表征。结果表明，红外光谱分析证实产物具有预期结果；随着羧酸根(–COOH)含量增加，乳液黏度增加，涂膜吸水率提高；有机硅改性提高了水性聚氨酯(WPU)体系交联密度，使得乳液黏度增加，涂膜吸水率下降，耐水性能提高。
UV curable waterborne polyurethane (WPU) coatings were prepared by serial steps method using toluene diisocyanate (TDI), polyethylene glycol (PEG, MW = 1000), α, α-dimethylol propionic acid (DMPA), 2-hydroxyethyl methacrylate (HEMA) as raw material, and UV-WPU was modified with 3-triethoxysilylpropylamine in this paper. The effect of different DMPA content, organosilicon addition and the degree of neutralization on the viscosity of UV-WPU emulsion and the water absorption properties of the curing film was investigated. The synthesized polyurethane structure was confirmed by the Fourier transform infrared spectroscopy (FTIR). The FTIR analysis identified that the target product be expected waterborne UV polyurethane, and with –COOH content increasing, the emulsion viscosity of the WPU increased and the water absorption of the films increased; and the organosilicon modified PU improved the crosslinking density, the viscosity of the WPU emulsion increased rapidly and the water absorption of the films decreased.