含柔性链超支化聚氨酯丙烯酸酯的制备及表征  

Synthesis and Characterization of Hyperbranched Polyurethane Acrylate with Flexible Chains

作　　者：董海晖 向洪平[1] 刘晓暄[1] 

机构地区：[1]广东工业大学材料与能源学院,广州510006

出　　处：《涂料工业》2017年第6期46-50,56,共6页Paint & Coatings Industry

基　　金：广州市产学研协同创新重大专项

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(DBTDL)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(M_n)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。A hyperbranched polyurethane （HPU-OH） was successfully synthesized from isophorone diisocyanate （IPDI） and diethanolamine （DEOA） via self- condensation. Mean- while, a prepolymer IPDI/PEG200/HEA having isocyanate and double bond was synthesized from polyethylene glycol （PEG200）, IPDI and 2-hydroxyethyl acrylate （HEA）. Then a hyperbranehed polyurethane acrylate （HPUA） with flexible chains was synthesized by graft reaction of the prepared prepolymer and HPU-OH. The synthesis conditions were optimized. The structure and composition of HPUA were characterized by FT-IR, ^1H NMR and GPC. Using 1 -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 1 level.

关 键 词：超支化聚氨酯丙烯酸酯 紫外光固化 涂膜性能 

分 类 号：TQ637.83[化学工程—精细化工]