Abstract: The traditional UV-curable polyurethane resins were terminated with double bonds，with fewer polar groups，which reduced the adhesion of the coating on the surface ofwood. This paper adopted a two-step method to introduce a multi hydroxyl hyperbranchedstructure into polyurethane systems prepared with different isocyanates and block them， synthesizing a UV-curable polyurethane wood coating containing multi hydroxylhyperbranched structure. The properties of UV-curable polyurethane resin and wood coatingswere investigated by gel permeation chromatography（GPC）， nuclear magnetic resonance（NMR）， fourier infrared spectroscopy（FT-IR）， thermogravimetric analysis（TGA）， dynamic thermal mechanical analysis（DMA）. The results indicated that a polyhydroxy hyperbranched isocyanate with a molar ratio of —NCO to —OH of 1∶8 had been successfully prepared and introduced into polyurethane. Among them，the polyurethane with 1-isocyanato-4-［（ 4-isocyanatocyclohexyl）methyl］-cyclohexane as the main component had a tensile strength of 34. 69 MPa，an elastic modulus of 10. 64 MPa，a glass transition temperature of 102. 02 ℃， and a paint film adhesion of level 0. This method provided an innovative solution for UV-curable PU wood coatings with high strength and adhesion.

Key words: UV-curable, hyperbranched, polyurethane, wood coatings

摘要： 传统 UV固化聚氨酯树脂以端双键封端，极性基团少，降低了涂层在木材表面的附着力。采用两步法将一种多羟基的超支化结构引入由不同异氰酸酯制备的聚氨酯体系中并封端，合成了含有多羟基超支化结构的紫外光固化聚氨酯木器涂料。采用凝胶渗透色谱仪（ GPC）、核磁共振波谱仪（NMR）、傅立叶变换红外光谱仪（ FT-IR）、热重分析仪（ TG）、动态热机械分析仪（ DMA）等测试表征方法，研究了紫外光固化聚氨酯树脂及木器涂料的各项性能。结果表明： —NCO与— OH物质的量比为 1∶8的多羟基超支化异氰酸酯制备成功并引入到聚氨酯中，其中以六甲撑基二异氰酸酯为主体聚氨酯的拉伸强度达到 34. 69 MPa，弹性模量达到 10. 64 MPa，玻璃化转变温度为 102. 02 ℃，漆膜附着力为 0级。此方法为具有高强度、高附着力的 UV固化型聚氨酯木器涂料提供了创新解决方案。

关键词: UV固化, 超支化, 聚氨酯, 木器涂料

CLC Number: 

• TQ637. 83