蓝光固化低黏型聚氨酯丙烯酸酯低聚物的合成及其性能研究

Synthesis and Properties of Low-Viscosity Blue-Light Cured Urethane Acrylate Oligomer

以异佛尔酮二异氰酸酯、聚丙二醇1000和丙烯酸羟乙酯为主要原料,采用两步法合成低黏型二官能团聚氨酯丙烯酸酯低聚物。通过二正丁胺滴定法和红外光谱法对合成反应进程进行跟踪监测,讨论反应温度、物料配比以及催化剂用量对合成过程的影响。结果表明合成聚氨酯丙烯酸酯低聚物的最佳工艺条件为:第一步反应温度80℃,不加催化剂,反应时间7h;第二步反应温度为50℃,催化剂用量占总量的0.05%,阻聚剂用量占总量的0.1%,反应时间2h。采用旋转流变仪和光量热系统对合成产物的流变性能和蓝光聚合性能进行评价,结果表明:在优化的合成条件下,所制得的聚氨酯丙烯酸酯低聚物具有黏度低、蓝光聚合性能优良的特点,能够满足蓝光固化纺织品数码印花墨水对低聚物流变和蓝光聚合性能的要求。

Low viscosity urethane acrylate oligomer with two functional groups was synthesized with two-step method by using isophorone diisocyanate（IPDI）,propylene glycol 1000（PPG-1000）and hydroxyethyl acrylate（HEA）as principal raw materials.Di-n-butylamine titration and infrared spectroscopy were used to track and monitor synthetic reaction process.The effects of reaction temperature,material molar ratio,catalyst dosage on the synthesis process of urethane acrylate oligomer were discussed.The results show the optimal conditions are listed as follows：in Stage 1,reaction temperature 80℃,no catalyst,and reaction time 7h;in Stage 2,reaction temperature 50℃,catalyst dosage 0.05% of total weight,polymerization inhibitor dosage 0.1% of total weight and reaction time 2h.Rotational rheometer and photo-differential scanning calorimetry（Photo-DSC）were used to assess rheological property and blue light polymerization property of synthetic product.The results show that urethane acrylate oligomer prepared under optimized synthesis conditions has low viscosity and blue light polymerization property and can satisfy the requirements of rheological and blue light induced polymeric performance for oligomer in photocurable digital printing ink.