摘要
Urea-isobutyraldehyde-formaldehyde (UIF) resin was synthesized from urea, isobutyraldehyde, and formaldehyde using sulfuric acid as a catalyst by one pot method. The effects of molar ratios of isobutyraldehyde to formaldehyde (n(I)/n(F)) and aldehyde to urea (n(A)/n(U)) on the yield, hydroxyl value (vs KOH) and softening point of the resin were investigated. The structure of the resin was characterized by FT-IR, 1H-NMR and 13C-NMR. The results show that when the molar ratio of urea to isobutyraldehyde to formaldehyde (n(U)/n(I)/n(F)) is 1.0/3.0/3.0, the yield UIF resin is 67.1%, and the softening point and hydroxyl value are 88 ℃ and 37 mg/g, respectively. The FT-IR, 1H-NMR and 13C-NMR results show that the lactam is formed by aminomethylation from urea, isobutyraldehyde, and formaldehyde.
Urea-isobutyraldehyde-formaldehyde （UIF） resin was synthesized from urea, isobutyraldehyde, and formaldehyde using sulfuric acid as a catalyst by one pot method. The effects of molar ratios of isobutyraldehyde to formaldehyde （n（I）/n（F）） and aldehyde to urea （n（A）/n（U）） on the yield, hydroxyl value （vs KOH） and softening point of the resin were investigated. The structure of the resin was characterized by FT-IR, 1H-NMR and ^13C-NMR. The results show that when the molar ratio of urea to isobutyraldehyde to formaldehyde （n（U）/n（I）/n（F）） is 1.0/3.0/3.0, the yield UIF resin is 67.1%, and the softening point and hydroxyl value are 88℃ and 37 mg/g, respectively. The FT-IR, ^1H-NMR and ^13C-NMR results show that the lactam is formed by aminomethylation from urea, isobutyraldehyde, and formaldehyde.
基金
Project(2006A10902001) supported by the Science and Technology Plan of Guangdong Province, China
Project(2007Z3-D0351) supported by the Science and Technology Plan of Guangzhou City, China
