高固含量UV固化水性聚氨酯丙烯酸酯的制备及性能研究

Study on Preparation and Performance of High Solid Content UV-curing Waterborne Polyurethane Acrylate

摘要:

以聚乙二醇600双丙烯酸酯（PEG600DA）作为可聚合非离子乳化剂制得高固含量（54%）紫外光固化水性聚氨酯丙烯酸酯乳液（UV-WPUA）。采用傅里叶红外（FTIR）、粒径分析仪、热重分析仪（TGA）、示差扫描量热仪（DSC）和力学性能测试考察了不同w（PEG600DA）对乳液及胶膜性能的影响。结果表明：随w(PEG600DA)从0%增至10.87%，乳液粒径从48.16nm降至 27.09nm，后增至78.52nm；乳胶膜软段玻璃化转变温度Tgs上升，硬段玻璃化转变温度Tgh下降；拉伸强度从22.19 MPa先增至27.82 MPa后降低到17.13MPa，断裂伸长率从315.17%降至203.93%；而w(PEG600DA)增加到6.09%时，胶膜的热稳定性最高，分解率为10%、30%和50%的热分解温度分别提高了16.324、18.804、17.547℃。

Abstract:

A series of high content UV-curable waterborne polyurethane /polyacrylate emulsion (UV-WPUA) were synthesized by Polyethylene glycol 600 diacrylate (PEG600DA) as polymerizable nonionic emulsifier. The structure and properties of UV-WPUA emulsion and films were characterized by Fourier transform infrared spectroscopy (FTIR), Dynamic laser light scattering instrument (Size), thermogravimetric analysis (TGA), Differential scanning calorimeter (DSC) and Mechanics Performance Testing. The results showed that: When PEG600DA mass fraction increased from 0% to 10.87%, the emulsion partical size decreeased from 48.16 nm and 27.09 nm, after increased to 78.52 nm, the glass transition temperature of soft section (Tgs) rised, and the glass transition temperature of hard segment (Tgh) decreased, the tensile strength firstly increased from 22.19 to 27.82MPa，and then descended to 17.13, the elongation at break reduced from 315.17% to 203.93. when PEG600DA content was 6.09%, the thermal stability of the film was optimal，the thermal decomposition temperatures with 10%, 30% and 50% weight loss were improved by 16.324, 18.804 and 17.547 ℃ respectively.