刨花板用大豆蛋白基胶黏剂的研究

Particle board with soy protein-based adhesives

为了提高刨花板用大豆Glycine max蛋白基胶黏剂的内结合强度和耐水性,在碱、尿素共同作用的大豆蛋白与酚醛树脂共聚(SPF)反应的基础之上,研究了在共聚之前经过交联的SPF与未经过交联的SPF对刨花板力学性能和吸水厚度膨胀率的影响。结果表明:1共聚之前经过交联的SPF胶黏剂刨花板24 h吸水厚度膨胀率满足国家标准GB/T 4897.3-2003中潮湿环境下的结构用板要求(≤10.0%)。其中,酚醛预聚液作为交联剂,刨花板内结合强度值满足标准中干燥状态下使用的家具及室内装修用板要求(≥0.40 MPa)。2傅里叶变换红外光谱(FT-IR)分析表明,交联剂主要与豆胶的伯胺反应,通过加成反应接到大豆蛋白分子链上。3差示扫描量热法(DSC)分析表明,交联剂与豆胶有比较明显的交联固化峰,交联反应比较理想。

To improve the internal bonding strength and water resistance of particle board using a soy protein- based adhesive, soy protein was treated with alkali and urea; then phenol formaldehyde resin was added to produce a soy protein-based adhesive （SPF）. The SPF adhesive was added to the particle board with and with- out a cross-linker and followed by copolymerization to study its mechanical properties and thickness swelling rate of water absorption. Analysis included Fourier Transform Infrared （Fr-IR） spectroscopy and Differential Scanning Calorimetry （DSC）. Results indicated that adding the SPF adhesive with the cross-linker before copolymerization had better water resistance, which met the GB/T 9846.3-2004 standard for particle board structures in a humid environment （~〈 10.0% ）. With preshrinking phenol formaldehyde as a cross-linker, the internal bonding strength of the particle board met the standards used in furniture and interior decoration re- quirements （1〉0.40 MPa）. The FT-IR and DSC results showed that the cross-linker agent mainly reacted with primary amine. DSC results also showed a strong reaction between the cross-linker and the protein. It inferred that adding cross-linker before the copolymerization was very important, which could improve the internal cohesion of soy protein-based adhesive. [Ch, 2 fig. 1 tab. 9 ref.]