摘要
大幅度降低甲醛与尿素的摩尔比(克分子比)是减少脲醛树脂胶中游离甲醛含量最有效的方法之一。低摩尔比(甲醛比尿素≤1.3)的脲醛树脂胶用于刨花板生产早有所闻,但用于胶合板生产尚不多见,究其原因主要是固化速度慢。从微观上讲,其树脂分子的交联程度低,用一般的固化剂难以达到良好的胶合性能。因之低摩尔比脲醛树脂胶如用于胶合板生产也必须解决固化问题。其途径。
This research indicated that the urea-formaldehyde resin glue with low molar ratio could reduce the content of free formol by three times. And taking 0.5% citric acid as firming agent is optimum. The active stage can be lengthened by adding just the right amount of triethanolamine, then the temperature is above 32℃.
出处
《林业科技》
北大核心
1989年第2期38-41,共4页
Forestry Science & Technology
