Wang Na, Wang Xinhui, Lang Jinyan, Hu Zhenhua, Zhang Heng
College of Marine Science and Biological Engineering, Qingdao University of Science & Technology, Qingdao 266042, China.
School of Food Engineering, Ludong University, Yantai 264025, China.
Polymers (Basel). 2021 Jun 22;13(13):2039. doi: 10.3390/polym13132039.
A new type of waterborne polyurethane acrylate was synthesized for use as a UV curing coating. The N,N-dihydroxy methyl ethyl-3-Methyl aminopropanoate monomer was first prepared via adding reactions of methyl acrylate and diethanol amine with methyl alcohol as the solvent. Then, the hyperbranched prepolymer was obtained by addition of trimethylolpropane with toluenesulfonic acid as catalyst and N,N-dimethyl formamide as solvent. The resulting hyperbranched and organosilicone modified waterborne polyurethane acrylates was synthesized through the mixed reaction of prepolymer and Hydroxy silicone oil, polyethylene glycol-1000, toluene diisocynate, dimethylolpropionic acid, 1,2-propylene glycol, hydroxyethyl acrylate, and triethylamine with dibutyltin dilaurate as the catalyst. The molecular structures were characterized by FT-IR and H NMR spectroscopy and GPC analysis and the thermal stability was studied by using TGA. Moreover, the influence of contemodnt of hydroxyl silicone oil, dimethylolpropionic acid, polyethylene glycol-1000, and prepolymer to various of properties such as glossiness, hardness, adhesive force, abrasion resistance, water absorption, elongation at break and tensile strength of films were analyzed. The temperature and catalyst dosage impact on percent conversion of isocyanate group (-NCO) were also studied. It was proven that the best dosage of hydroxyl silicone oil and dimethylolpropionic acid were 4.6%, the dosage of polyethylene glycol-1000 was 50%, and the amount of hyperbranched prepolymer was 0.5%, which could make the film achieve the optimum properties. The percent conversion of isocyanate group (-NCO) was maximum when reacting two hours at 80 °C with 0.2% catalyst.
合成了一种新型的水性聚氨酯丙烯酸酯用作紫外光固化涂料。首先以甲醇为溶剂，通过丙烯酸甲酯与二乙醇胺的加成反应制备N,N-二羟甲基乙基-3-甲基氨基丙酸酯单体。然后，以甲苯磺酸为催化剂、N,N-二甲基甲酰胺为溶剂，加入三羟甲基丙烷得到超支化预聚物。以二月桂酸二丁基锡为催化剂，通过预聚物与羟基硅油、聚乙二醇-1000、甲苯二异氰酸酯、二羟甲基丙酸、1,2-丙二醇、丙烯酸羟乙酯和三乙胺的混合反应，合成了所得的超支化有机硅改性水性聚氨酯丙烯酸酯。通过傅里叶变换红外光谱（FT-IR）、核磁共振氢谱（H NMR）和凝胶渗透色谱（GPC）分析对分子结构进行了表征，并使用热重分析仪（TGA）研究了热稳定性。此外，分析了羟基硅油、二羟甲基丙酸、聚乙二醇-1000和预聚物的含量对薄膜的光泽度、硬度、附着力、耐磨性、吸水性、断裂伸长率和拉伸强度等各种性能的影响。还研究了温度和催化剂用量对异氰酸酯基（-NCO）转化率的影响。结果表明，羟基硅油和二羟甲基丙酸的最佳用量均为4.6%，聚乙二醇-1000的用量为50%，超支化预聚物的用量为0.5%，此时薄膜性能最佳。当在80℃下反应2小时且催化剂用量为0.2%时，异氰酸酯基（-NCO）的转化率最高。
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