为了研究复合型固化剂对酚醛树脂(PF)适用期、胶接性能的影响,同时实现酚醛树脂的快速固化,在分析添加了单组分固化剂羟甲基脲(MMU)、碳酸丙烯酯(PC)、碳酸钠(Na2CO3)和氢氧化镁(Mg(OH)2)的酚醛树脂相关性能指标的基础上,对单组分固化剂进行复配得到了复合型固化剂,并对复配前后的相关性能指标进行了分析。结果表明:单组分固化剂可以提高PF树脂的胶合强度,但不能满足胶合板生产至少4 h适用期的要求; MMU+Na2CO3复合固化剂不仅在7 h内黏度变化较小,而且可以显著提高PF树脂的固化速度,使胶合板的热压时间由330 s缩短至270 s,且产品质量达到国家标准中Ⅰ类胶合板胶合强度(≥0.7 MPa)的要求。试验表明,MMU+Na2CO3是一种可用于胶合板生产的PF树脂快速固化剂。
Abstract
In order to meet fast curing requirements of PF resin without pot life and wet shear strength,compound curing agents were obtained by combination of single curing agent, including methylolureas(MMU), propylene carbonate(PC), sodium carbonate(Na2CO3), magnesium hydrate(Mg(OH)2).By comparing the properties of PF resins added with single with the compound curing agents, it indicated that: Although single curing agent improved the on wet shear strength of plywood, but pot lifes was too short to meet the production requirement of at least 4 hours. The compound curing agent of MMU+Na2CO3 showed obvious effect on fast curing PF resin by shortening the hot pressing time from 330 s to 270 s, and the plywood wet shear strength reached the class Ⅰ of Chinese industry standard(≥0.7 MPa). The compound curing agent of MMU+Na2CO3 was a suitable fast curing agent which could be used in plywood production.
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基金
收稿日期:2014-02-18 修回日期:2014-05-20
基金项目:国家自然科学基金项目(31200441); 中央级公益性科研院所基本科研业务专项基金项目(CAFINT2013K03); “十二五”国家科技支撑计划(2012BAD24B04)
第一作者:陈玉竹,博士生。*通信作者:储富祥,研究员。E-mail:chufuxiang@caf.ac.cn。
引文格式:陈玉竹,储富祥,范东斌,等. 复合型酚醛树脂固化剂的研究[J]. 南京林业大学学报:自然科学版,2015
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