On the Study of the Effect of Different Ionic Groups on the Physical Property of Water-Based PU Resins

• Main Authors: Jin-Horng Chiang, 姜錦宏
• Other Authors: D. Y. Chao
• Format: Others
• Language: zh-TW
• Published: 2000
• Online Access: http://ndltd.ncl.edu.tw/handle/94412219271892374845

碩士 === 中國文化大學 === 應用化學研究所 === 88 === The reaction of toluene diisocyanate(TDI) with dimethylol propionic acid（DMPA）or 1,3-propane sultone（ES-200）and other additives to form the structure of water-based polyurethane resin has been proven by FT-IR spectra. In aqueous solution, the surface tension of water-based polyurethane are seen to increase with increasing the concentration of dimethylol propionic acid（DMPA）. This is because the adsorption of hydrophobic at the surface of water, becoming even more order. Under the same experimental condition, the surface tension of water-based polyurethane appears to decrease with increasing the concentration of 1,3-propane sultone（ES-200）, respectively, as a result of hydrophobic of 1,3-propane sultone（ES-200）adsorbed at the surface of the aqueous solution. The viscosity of water-based PU resin in aqueous solution is seen to decrease with increasing the concentration of dimethylol propionic acid（DMPA）or 1,3-propane sultone（ES-200）, as a result of decreased free volume resulting from intermolecular interaction of PU ionomer molecule itself which may form compact conformation or micell-link structure. Experimental results indicate that both tensile strength and the modulus of self-cured film of PU ionomer molecule appear to decrease with increasing the concentration of dimethylol propionic acid（DMPA）or 1,3-propane sultone（ES-200）, as the result of the formation of compact conformation or micell structure resulting from strong intermolecular interaction of PU ionomer molecule. For the elongation of self-cured film of PU ionomer, it appears to increase with increasing dimethylol propionic acid（DMPA）or 1,3-propane sultone（ES-200）, as a result of the intermolecular and intermolecular interaction of this ionomer molecule. The number average particle size of water-based PU resin molecule in aqueous solution appears to increase with an increase of the concentration of dimethylol propionic acid（DMPA）or 1,3-propane sultone（ES-200）, the reason because the interaction between ionomer-ionomer molecules and ionomer-water molecules may increase the free volume of the ionomer molecules, thus causing their number average particle size to increase. For the peel strength of PU ionomer, it appears to decrease with increasing dimethylol propionic acid（DMPA）, the because of increased of hydrophobic groups, this may be the reason to explain why the peel strength becomes weak. Under the same experimental condition, the peel strength of PU ionomer, it appears to increase with increasing 1,3-propane sultone（ES-200）, the because of increased of hydrophilic groups, this may be the reason to explain why the peel strength becomes strong.