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采用气相色谱,在强酸(pH≈1)及脲和甲醛过量的条件下,通过测量脲、异丁醛和甲醛反应体系中异丁醛浓度随时间的变化,研究了脲-异丁醛-甲醛树脂的合成反应动力学,探讨了脲、异丁醛和甲醛的反应机理。结果表明,在反应体系中,脲、异丁醛和甲醛反应对异丁醛的反应级数为1,其反应表观活化能为77.05kJ·mol-1。脲、异丁醛和甲醛的反应为Mannich反应。
By gas chromatography, the change of the concentration of isobutyraldehyde in urea, isobutyraldehyde and formaldehyde reaction system over time under the conditions of strong acid (pH≈1) and excess urea and formaldehyde, the effects of urea-isobutyraldehyde-formaldehyde Resin synthesis reaction kinetics, discusses the reaction mechanism of urea, isobutyraldehyde and formaldehyde. The results showed that the reaction order of urea, isobutyl aldehyde and formaldehyde to isobutyraldehyde was 1, and the apparent activation energy of reaction was 77.05 kJ · mol-1 in the reaction system. The reaction of urea, isobutyraldehyde and formaldehyde is Mannich reaction.