淀粉基人造板胶粘剂的制备和表征
首发时间:2019-01-10
摘要:通过将醋酸乙烯酯(VAC)接枝到玉米淀粉分子上,再将得到的产物与N-羟甲基丙烯酰胺(NMA)进行交联聚合反应了合成了一种新型的可生物降解、可再生、绿色环保的淀粉基人造板胶粘剂。与传统淀粉胶粘剂相比,与NMA交联的胶粘剂(SWA-N)的耐水性大幅提高,超过了1MPa;通过粒径分析、热重分析(TGA)、傅立叶红外光谱(FTIR)、共聚焦拉曼显微镜(CRM)和固体核磁(13C-CPMAS)等手段进行分析,结果表明:性能的提高是由于交联密度的提高以及复杂的网络结构的形成,这种网状结构可以抑制胶粘剂在热压过程中和吸水过程中的过度膨胀,从而使试件能保持完整结构。
关键词: 玉米淀粉 N-羟甲基丙烯酰胺 交联 醋酸乙烯酯 接枝 人造板胶粘剂
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Preparation and characterization of starch-based adhesive for wood-based panels
Abstract:A new biodegradable, renewable, and environmentally friendly starch-based adhesive for wood-based panels was synthesized. The synthesis was conducted by grafting polymerization of vinyl acetate (VAC) monomer onto corn starch and crosslinking polymerization with N-methylol acrylamide (NMA). Compared with the traditional starch-based wood adhesive, the water resistance of starch-based adhesive with NMA (SWA-N) was greatly improved to more than 1 MPa; this exceeds the Chinese standard by 40%. The results from various analyses, including particle size, contact angle, thermogravimetric analysis (TGA), Fourier-transform infrared (FTIR), confocal Raman microscopy (CRM) and 13C- CPMAS, indicated that such improved performance is due to increased crosslinking density and formation of complex network structure. Such complex network structure was found to inhibit excessive expansion of the adhesive during high temperature pressing and water absorption. As a result, the internal structure of the adhesive remained intact when subjected to hot pressing and placed in wet conditions.
Keywords: corn starch N-methylol acrylamide crosslinking vinyl acetate graft polymerization adhesive for wood-based panels
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