Doping PEG as surfactant and film forming auxiliary to improve the solid content of the waterborne polyurethane

• Main Authors: Chung Ting, Cheng, 鄭仲廷
• Other Authors: 張淑美
• Format: Others
• Language: zh-TW
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/j8vef2

碩士 === 國立臺北科技大學 === 分子科學與工程系有機高分子碩士班 === 106 === High solids waterborne polyurethane (HSWPU) can increase the production efficiency of the factory due to the solvent evaporation time is reduced in processing applications. However, HSWPU has poor performance in liquidity, and it is inconvenient for processing and application. It needs to be overcome at this step. In the experiment, the anionic surfactant (sodium dodecyl sulfate) and the non-ionic surfactant (polyethylene glycol, Mn=200) were added at the end to improve the fluidity and storage stability. And to establish the data after adding the surfactant to the WPU. Polyethylene glycol can be used as a surfactant in the dispersion and can also be used as a film-forming auxiliary during film forming. In the study, Polytetramethylene ether glycol (PTMG) was polymerized with 4,4-dicyclohexylmethane diisocyanate (H12MDI). Dimethylolpropionic acid (DMPA) was used as the hydrophilic group and triethylamine (TEA) as a neutralizer, butanediol (BDO) was used as a chain extender. The surfactant was adding after the PU dispersed to assist dispersing. The study discussed the porperties of the anionic WPU with surfactant by changing the weight percentage and the type of the surfactants. In this experiment, the viscometer was used to observe the fluidity of the HSWPU dispersion, and it was found that the addition of surfactants was helpful to decrease the viscosity of the HSWPU dispersion. Fourier transform infrared spectrometer (FT-IR), Universal Tensile Tester, and Scanning Electron Microscope (SEM) were used to observe the relationship between the molecular structure of the WPU film and the effect of hydrogen bonding on mechanical properties. UV/Visible Spectrometer (UV-VIS), X-ray diffraction analysis (XRD), Thermogravimetric analyzer (TGA), Differential scanning calorimeter (DSC), Energy Scattering Spectrometer Analysis (EDS), contact angle measuring instrument and other instruments to observe other properties of WPU film.