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首页> 外文期刊>Journal of Applied Polymer Science >Examination of Selected Synthesis Parameters for Typical Wood Adhesive-Type Urea-Formaldehyde Resins by ~(13)C-NMR Spectroscopy.II
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Examination of Selected Synthesis Parameters for Typical Wood Adhesive-Type Urea-Formaldehyde Resins by ~(13)C-NMR Spectroscopy.II

机译：〜（13）C-NMR光谱法检测典型的木材粘合型脲醛树脂的合成参数

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摘要

A particleboard adhesive-type urea-formaldehyde (UF) resin was made at a formaldehyde ratio of 2.10 and added with a second urea at low temperature to the typical final formaldehyde/urea ratio of 1.15. Time samples taken during heat treatments of the resin sample up to 70deg C over a period of 250 min showed decreases in Type II/IIi hydroxymethyl group content, accompanied with decreases in resin sample viscosity and increases in formaldehyde emission of bonded particleboards. The results indicate that various hydroxymethyl groups of polymeric UF resin components migrate to the second urea to form Type I hydroxymethyl groups. Time samples taken during the room-temperature storage of the resin sample over a period of 1 month behaved similarly initially, but in the later stage, some polymerization progressed, shown by increases in viscosity and methylene and methylene-ether group contents.
机译：以甲醛比为2.10制备刨花板粘合剂型脲醛（UF）树脂，并在低温下添加第二脲至典型的最终甲醛/脲比为1.15。在250分钟内对树脂样品进行最高70摄氏度的热处理期间所采集的时间样品显示II / IIi型羟甲基含量降低，同时树脂样品粘度降低，粘合刨花板的甲醛释放量增加。结果表明，聚合的UF树脂组分的各种羟甲基迁移至第二脲以形成I型羟甲基。树脂样品在室温下保存1个月以上所采集的时间样品起初表现类似，但在后期阶段，一些聚合反应进行了，表现为粘度和亚甲基及亚甲基醚基含量的增加。

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