水性聚氨酯油墨连接料结构设计及性能研究

发布时间：2018-05-01 06:43

  本文选题：水性聚氨酯 + 油墨　； 参考：《长春工业大学》2017年硕士论文

【摘要】：用异氟尔酮二异氰酸酯(IPDI)、聚丙二醇(PPG)、二羟甲基丙酸(DMPA)和1,4-丁二醇为主要原材料,通过两步聚合法合成一系列水性聚氨酯(WPU)分散体。运用傅里叶红外光谱(FTIR)、透射电子显微镜(TEM)、示差扫描量热分析(DSC)、热重分析(TGA)、X射线衍射(XRD)、偏光显微镜(POM)、接触角测试和力学性能测试等多种表征方法分析了WPU分散体的粘度、粒径、固含量以及WPU胶膜的结构、相分离程度、热性能、结晶性能、透湿性能、力学性能和透光率等。重点研究了硬段/软段的摩尔比(rm)对WPU性能的影响,其次还研究了亲水单体(DMPA)、中和度和扩链温度对WPU性能的影响。研究rm对WPU的影响时,rm分别取3,4,5,发现所制备的WPU分散体均具有较高的固含量,高达到40%、较低的粘度,其粘度范围是20-50mp.s和较小的粒径,其粒径范围是54.7-87.9nm。所有分散体表现出较好的电荷稳定性,其胶膜具有较低的结晶性能和较高的耐热性能,三个样品的最高热分解温度在400℃左右,硬段的降解温度在220-330℃,而软段的降解温度在330-400℃。WPU样品胶膜都具有较高的透光率,其范围在87%-99%之间。正是因为WPU具有这些特性,可以作为水性聚氨酯油墨连接料直接使用,不用去除有机溶剂。研究DMPA、中和度和扩链温度对WPU性能的影响时,发现不同的DMPA含量及不同的中和度对WPU分散体储存稳定性、粒径和粘度均有不同程度的影响,当DMPA含量大于2%时,WPU才能形成稳定的分散体,分散体粒径范围在21.5-51nm之间。当WPU分散体中和度小于或等于70%时,分散体不稳定。当扩链温度分别为40℃、50℃、60℃、70℃时,WPU分散体稳定性没有明显变化,胶膜吸水率降低,粘结强度增加。
[Abstract]:A series of waterborne polyurethane (WPUU) dispersions were synthesized by two-step polymerization with isoflurone diisocyanate (IPDI), polypropanediol (PPG), dimethylol propionate (DMPA) and 1,4-butanediol as the main raw materials. The viscosity and particle size of WPU dispersion were analyzed by Fourier transform infrared spectroscopy (FTIR), transmission electron microscope (TEM), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), X-ray diffraction (XRD), polarizing microscope (POM), contact angle test and mechanical property test. Solid content and structure, phase separation degree, thermal property, crystallization property, moisture permeability, mechanical property and light transmittance of WPU film. The influence of the molar ratio of hard segment to soft segment on the properties of WPU was studied, and the effects of hydrophilic monomer, neutralization degree and chain extension temperature on the properties of WPU were also studied. When studying the effect of RM on WPU, we found that the prepared WPU dispersions have higher solid content, up to 40% and lower viscosity. The viscosity ranges from 20-50mp.s and smaller particle size to 54.7-87.9 nm. All the dispersions showed good charge stability, and the film had lower crystallization property and higher heat resistance. The highest thermal decomposition temperature of the three samples was about 400 鈩，

本文编号：1828213