树枝状紫外光固化树脂的合成及其性能

Synthesis and properties of dendritic UV-curing resin

为了减少活性稀释剂在紫外光固化树脂中的使用,合成了低黏度树枝状紫外光固化树脂。首先,采用发散法以乙二胺为反应核,在25℃下通过与甲基丙烯酸甲酯进行Michael加成及酰胺化两步迭代反应,合成了1.0代树枝状大分子聚酰胺胺(G1.0PAMAM)。其次,通过丙烯酸羟乙酯与0.5代PAMAM反应合成端羟基PAMAM大分子。最后,通过顺丁烯二酸酐(MA)及甲基丙烯酸缩水甘油酯(GMA)对其进行改性,合成了树枝状PAMAM紫外光固化树脂。通过傅里叶变换红外光谱(FT IR)对其进行表征。对PAMAM紫外光固化树脂的黏度温度特性进行了研究,测定了G0.5PAMAM和G1.5PAMAM紫外光固化涂膜具有良好的热稳定性,附着力均为1、铅笔硬度分别为3H和4H、柔韧性分别为3 mm和5 mm,并详细讨论了分子结构对涂层性能的影响。

In order to reduce the use of active diluent in UV-curable resin,low viscosity dendritic UV-curable resin was synthesized.Firstly,the 1.0 generation dendritic macromolecule polyamide-amine(G1.0PAMAM)was synthesized using ethylenediamine as the reaction nucleus by means of a two-step iterative reaction of Michael addition and amidation with methyl methacrylate at 25℃.Secondly,hydroxy-terminated PAMAM macromolecules were synthesized by reacting hydroxyethyl acrylate with half-generation PAMAM.Finally,dendritic PAMAM resin was synthesized by modifying maleic anhydride(MA)and glycidyl methacrylate(GMA).It was characterized by Fourier transform infrared spectroscopy(FT-IR).The viscosity-temperature properties of PAMAM UV-curable resin were studied.Good thermal stabilities of G0.5PAMAM and G1.5PAMAM UV-curable film were determined,adhesive force were 1,the hardness of pencil were 3H and 4H respectively,the flexibility were 3 mm and 5 mm respectively,and effects of molecular structure on the properties of the coating were discussed in details.