Effect of 2,2-Bis(Hydroxymethyl) Propionic Acid Content on the Properties of Aqueous Polyurethane
As a multi-functional environmental protection material, waterborne polyurethanes (WPUs) has received increasing attention due to their excellent elasticity, such as wear resistance, flexibility and wide range of substrate suitability. In the field of ink printing, waterborne polyurethane materials have became an effective alternative to solvent-based polyurethane adhesives. However, the performance of WPUs still needs to be improved. In this paper, acetone-dilution method was used to synthesize the required waterborne polyurethane with different amount of DMPA. The particle size of the synthetic polyurethane emulsion is determined by the particle size distribution (PSD). Transmission electron microscopy (TEM) was used to confirm that the synthesized emulsion had a spherical structure. By comparing the solids content, the water absorption test and the adhesion test, it was confirmed that the content of DMPA has a great influence on the polyurethane system. As the DMPA content increases, the average particle size of the polyurethane can be reduced, and the adhesion of the emulsion to the substrate can be improved, but the water resistance decreases due to the increase of the hydrophilicity. Therefore, the comprehensive effect is best when the added amount of DMPA is 5%.
KeywordsWaterborne polyurethane Macrodiol DMPA Water absorption
This study was funded by a National Natural Science Foundation of China (21376008)—Design, Synthesis and Structure-Activity Relationship of Novel Emulsions for Water-based Inks.
- 4.Li, R., & Shan, Z. (2018). Enhancement of thermal conductivity of PEG-PPG-based waterborne polyurethane coating by incorporating ordered polyethylene glycol fragment. Polymer Testing.Google Scholar
- 5.Hou, L., Ding, Y., Zhang, Z., et al. (2015). Synergistic effect of anionic and nonionic monomers on the synthesis of high solid content waterborne polyurethane. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 467(467), 46–56.Google Scholar