The Investigation and Preparation of UV-Curable Solvent-Free Waterborne Polyurethane Acrylate

• Main Authors: Lyu, GuoJhih, 呂國志
• Other Authors: Lee, DaKong
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/25035193897836731002

碩士 === 國立宜蘭大學 === 化學工程與材料工程學系碩士班 === 100 === UV-curable waterborne polyurethane acrylate (UV-PUA) has the advantages of pollution reduction, energy saving and rapid hardening. It has been widely used as inks, sealants and textile treatments. In this study three series of solvent free UV-PUA were synthesized by using m-TMXDI：PCD-L4671：DMBA：TEA：mixed chain extender with the molar ratio of 3：1：1：1：0.8. Three different reactive acrylate monomers with various functionality of double bonds and hydroxyl group：Hydroxyethlacrylate (HEA)；Bisphenol A glycerolate dimethacrylate (DDA) and Pentaerythritol triacrylate (PETA) were adopted as the chain extenders. The mixed chain extenders in this study used are EDA mixed with various reactive acrylate monomers (HEA or DDA or PETA) with various equivalent ratios of 10：0；8：2；6：4；4：6；2：8 and 0：10. The properties were characterized by particle size, attenuated total reflectance fourier transform infrared (ATR-FTIR), gel fraction, tensile property, differential scanning calorimetry, dynamic mechanical analysis, and thermal gravimetric analysis. From the study we can reveal the following results：(1) In this study non-solvent UV-PUA as can be produced base on m-TMXDI successfully. (2) All UV-PUAs display superior tensile strength than corresponding PUD, the introducing reactive acrylic monomers into PUD cause the crosslinks structure after UV-curing thus improved the strength property and solvent resistance of final products. The mixed chain extenders with the same equivalent ratio, the PETA based UV-PUA has the higher C=C content, thus it exhibits the higher tensile strength and thermal stability than those HEA and DDA based UV-PUA. (3) UV-PUAs exhibit improved thermal stability than corresponding PUD. The 50 wt % loss temperature were increased from 309℃ for T41BE to 388℃ for TE0P10. (4) A series of UV-PUA based on HEA, DDA and PETA with the same amount of C=C content of 0.669 meq/g were investigated. DDA based UV-PUA displays higher modulus, strength property than those HEA and PETA based UV-PUA, it is due to the rigidity benzyl structure.