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首页> 外文期刊>Journal of Applied Polymer Science >Influence of Preparation Parameters on the CHT Curing Diagrams of MUF Polycondensation Resins
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Influence of Preparation Parameters on the CHT Curing Diagrams of MUF Polycondensation Resins

机译：制备参数对MUF缩聚树脂CHT固化图的影响

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摘要

Lignocellulosic substrates such as wood have been found to have a marked modifying influence on both lower-temperature and higher-temperature zones of TTT and CHT diagrams during hardening of formaldehyde-based polycondensates. While the modifying influence of the substrate has been described, the modifying influence of some of the most important manufacturing parameters of the resins on the CHT diagram, not having been previously investigated, are explored here and clear trends are shown. In the case of melamine-urea-formaldehyde (MUF) resins for wood adhesives, the molar ratio (M + U):F appear to be the dominant parameter influencing the relative position of gel and vitrification curves in relation to each other. The ratio of melamine to urea does not appear to have any effect on the relative position of the curve, lacking any clear trend, at least at the higher (M + U) molar ratio of 1:1.9 used for this series of resins. In the case presented for the first time, the influence of resin manufacturing parameters on CHT curing diagrams was studied in combination with the modifica-tions introduced by the substrate.
机译：已经发现木质纤维素基材（例如木材）在甲醛基缩聚物固化过程中对TTT和CHT图的低温和高温区域都有明显的影响。尽管已描述了基材的改性影响，但这里仍未探究过一些树脂最重要的制造参数对CHT图的改性影响，并显示了明显的趋势。在用于木材粘合剂的三聚氰胺-脲-甲醛（MUF）树脂的情况下，摩尔比（M + U）：F似乎是影响凝胶相对位置和玻璃化曲线彼此相对的主要参数。三聚氰胺与尿素的比例似乎对曲线的相对位置没有任何影响，没有明显的趋势，至少在用于该系列树脂的摩尔比（M + U）为1：1.9更高。在首次出现的情况下，结合基材引入的修改，研究了树脂制造参数对CHT固化图的影响。

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