Preparation of Aqueous Polyurethane Dispersions Using Aromatic Diisocyanate |
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| Authors: | Shunji Sugano Charoen Chinwanitcharoen Shigeyoshi Kanoh Toshiro Yamada Shunichi Hayashi Kaoru Tada |
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| Institution: | 1. Negami Chemical Industrial Co., Ltd., Ro-22, Dorin-machi, Nomi-city, Ishikawa, 929-0125, Japan;2. Department of Chemical Engineering, Faculty of Engineering, Burapha University, Chonburi, 20131, Thailand;3. Department of Chemistry and Chemical Engineering, Faculty of Engineering, Kanazawa University, Kakuma-machi, Kanazawa, 920-1192, Japan;4. Diaplex Co., Ltd., 5-2, Ebisuminami 1-chome, Shibuya-Ku Tokyo, 150-0022, Japan |
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| Abstract: | Aqueous polyurethane dispersions were prepared by the reaction of hydroxyl-terminated poly(ethylene adipate), ethylene glycol, dimethylol propionic acid and aromaic diisocyante, 4,4′-diphenylmethane diisocyanate. The influence of molecular weight of oligoester and molar ratio between isocyanate and hydroxyl groups (NCO/OH) in the prepolymerization step were investigated. Molecular weight, particle size and particle size distribution were measured and compared. It was verified that the molecular weight increases with increasing in NCO/OH molar ratio. The results suggest that the hard segment content plays an important role in particle size and particle size distribution of the dispersions. |
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| Keywords: | aqueous dispersions aromatic diisocyanate hard segment content particle size dispersion polyurethanes |
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