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首页> 外文期刊>Journal of Applied Polymer Science >Curing of low level melamine-modified urea-formaldehyde particleboard binder resins studied with dynamic mechanical analysis (DMA)
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Curing of low level melamine-modified urea-formaldehyde particleboard binder resins studied with dynamic mechanical analysis (DMA)

机译：用动态力学分析（DMA）研究低含量三聚氰胺改性的脲醛刨花板粘合剂树脂的固化

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摘要

Effects of resin formulation, catalyst, and curing temperature were studied for particleboard binder-type urea-formaldehyde (UF) and 6 ∼ 12%, melamine-modified urea-melamine-formaldehyde (UMF) resins using the dynamic mechanical analysis method at 125 - 160° C. In general, the JF and UMF resins gelled and, after a relatively Iona low modulus period, rapidly vitrified. The gel times shortened a the catalyst level and resin mix time increased. The cure slope of the vitrification stage decreased as the catalyst mix time increased, perhaps because of the deleterious effects of polymer advancements incurred before curing. For UMF resins, the higher extent of polymerization effected for UF base resin in resin synthesis increased the cure slope of vitrification. The cure times taken to reach the vitrification were longer for UMF resins than UF resins and increased with increased melamine levels. The thermal stability and rigidity of cured UMF resins were higher than those of UF resins and also higher for resins with higher melamine levels, to indicate the possibility of bonding particle-board with improved bond strength and lower formaldehyde emission. © 2005 Wiley Periodicals, Inc.
机译：研究了刨花板粘结剂型脲醛树脂（UF）和6＆SIM的树脂配方，催化剂和固化温度的影响。使用动态力学分析方法在125-160°C下使用12％的三聚氰胺改性的脲-三聚氰胺-甲醛（UMF）树脂; C.通常，JF和UMF树脂胶凝，并且在相对较低的Iona低模量周期后迅速玻璃化。凝胶时间缩短了催化剂水平，并且树脂混合时间增加了。玻璃化阶段的固化斜率随着催化剂混合时间的增加而降低，这可能是由于固化前聚合物前进的有害作用。对于UMF树脂，在树脂合成中对UF基础树脂进行更高程度的聚合会增加玻璃化的固化斜率。对于UMF树脂，达到玻璃化所需的固化时间比UF树脂更长，并且随着三聚氰胺含量的增加而增加。固化的UMF树脂的热稳定性和刚性高于UF树脂，并且对于三聚氰胺含量较高的树脂也更高，这表明粘合粘合密度与降低甲醛释放量的刨花板的可能性。 ＆复制; 2005 Wiley期刊公司

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