Abstract: A hyperbranched polyurethane(HPU-OH) was successfully synthesized from isophorone diisocyanate (IP DI) and diethanolam (DEOA) via self-condensation. Mean- while, a prepolymer IP PEG200/HEA having isocyanate and double bond was synthesized from polyethylene glycol(PEG200), IPDI and 2-hydroxyethyl acrylate(HEA). Then a hy- perbranched polyurethane acrylate (HPUA) with flexible chains was synthesized by graft reac-tion of the prepared prepolymer and HPU-OH. The synthesis conditions were optimized. The structure and composition of HPUA were characterized by FT-IR, H NMR and GPC. Using I-hydroxy-cyclohexyl-phenyl-ketone Irgacure184)as a photoinitiator, the cured film of the Uv-curable HPUA was tested. The optimal synthesis conditions of IPDI/PEG200/HEA was that the composition was reacted at 35℃ for 120 min at the presence of DBTDL as a catalyst with its dosage 0. 037 5% of the weight of HEA. And the optimal synthesis conditions of HPUA was that the composition was reacted at 70℃ for 120 min at the presence of DBTDL with its dosage 0. 05 %. The number average molecular weight was 13 683 and PDI was 2.1 as observed by GPC. Compared with the commercialized product of its kind, the Uv-cured HPUA film displayed excellent properties such as fast Uv-curing speed 3 s, flexibility 1 mm, pencil hardness 2H and adhesion I level.

Key words: hyperbranched polyurethane acrylate, UV-curing, properties of Uv-cured coatings

摘要： 以异佛尔酮二异氰酸酯（ＩＰＤＩ）和二乙醇胺（ＤＥＯＡ）为原料，经一步法自缩聚反应制备超支化聚氨酯（ＨＰＵ－ＯＨ）。 再以聚乙二醇（ＰＥＧ２００）、ＩＰＤＩ 和丙烯酸羟乙酯（ＨＥＡ）为原料合成一端为异氰酸基团、另一端为双键的预聚体 ＩＰＤＩ／ ＰＥＧ２００ ／ ＨＥＡ，将其接枝到 ＨＰＵ－ＯＨ 后合成含柔性链超支化聚氨酯丙烯酸酯（ＨＰＵＡ）。 优化了合成条件；并采用 ＦＴ－ＩＲ、１Ｈ ＮＭＲ 和 ＧＰＣ 对其结构和组成进行了表征。 以 １－羟基环己基苯基甲酮（Ｉｒｇａｃｕｒｅ１８４）作为光引发剂，对 ＨＰＵＡ 涂膜紫外光固化后进行测试。 结果表明：优化后 ＩＰＤＩ／ ＰＥＧ２００ ／ ＨＥＡ 的合成条件为温度 ３５ ℃ 、催化剂二月桂酸二丁基锡（ＤＢＴ?ＤＬ）用量为丙烯酸羟乙酯质量的０. ０３７ ５％、反应时间为 １２０ ｍｉｎ；优化后 ＨＰＵＡ 的合成条件为温度 ７０℃ 、ＤＢＴＤＬ 用量为 ０.０５％、反应时间为 １２０ ｍｉｎ。 合成的 ＨＰＵＡ 产品数均相对分子质量（ Ｍｎ ） 为１３ ６８３，相对分子质量分布指数（ＰＤＩ）为 ２.１；与同类产品相比，其固化速度快且涂膜柔韧性优异，光固化速度为 ３ ｓ，柔韧性 １ ｍｍ，铅笔硬度 ２Ｈ，附着力 １ 级。

关键词: 超支化聚氨酯丙烯酸酯, 紫外光固化, 涂膜性能