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Characterization and Performance of Soy-Based Adhesives Cured with Epoxy Resin

机译：环氧树脂固化的大豆基胶粘剂的表征与性能

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Soy-based adhesives have attracted much attention recently because they are environmentally safe, low cost, and readily available. To improve the gluability and water resistance of soy-based adhesives, we prepared an enzyme-treated soy-based adhesive modified with an epoxy resin. We investigated the wet shear strength of plywood bonded with the modified adhesive using the boiling-water test. Fourier transformed infrared spectroscopy (FTIR) and 1H nuclear magnetic resonance analysis were used to characterize the reaction between epoxy groups and –NH2 groups in the modified soy-based adhesives. FTIR analysis confirmed the cross-linking structure in the cured adhesives. Viscosity and the solid content of soy-based adhesives gradually increased with the increasing amount of epoxy resin, but had little effect on its operability. Wet shear strength of plywood samples increased as the amount of epoxy resin was increased, whereas the inverse trend was observed regarding the water absorption of cured adhesives. Compared to an unmodified adhesive, the addition of 30% of epoxy resin increased the wet shear strength of plywood samples by 58.3% (0.95 MPa), meeting the requirement of the Chinese National Standard for exterior plywood. Differential scanning calorimetry and thermogravimetric analysis showed the improved thermostability of the cured adhesives after curing at 160 °C. These results suggest that epoxy resin could effectively improve the performance of enzyme-treated soy-based adhesives, which might provide a new option for the preparation of soy-based adhesives with high gluability and water resistance.
机译：大豆基粘合剂最近因其对环境安全，低成本和易于获得而备受关注。为了改善大豆基胶粘剂的粘合性和耐水性，我们制备了用环氧树脂改性的酶处理大豆基胶粘剂。我们使用沸水试验研究了用改性粘合剂粘合的胶合板的湿剪切强度。傅里叶变换红外光谱（FTIR）和 1 H核磁共振分析用于表征改性大豆基胶粘剂中环氧基与–NH2之间的反应。 FTIR分析证实了固化的粘合剂中的交联结构。大豆基胶粘剂的粘度和固体含量随着环氧树脂用量的增加而逐渐增加，但对其可操作性的影响很小。胶合板样品的湿剪切强度随环氧树脂用量的增加而增加，而固化胶的吸水率却​​呈现相反的趋势。与未改性的胶粘剂相比，添加30％的环氧树脂可使胶合板样品的湿剪切强度提高58.3％（0.95 MPa），满足中国国家对外墙胶合板的要求。差示扫描量热法和热重分析表明，在160℃下固化后，固化的粘合剂的热稳定性得到改善。这些结果表明环氧树脂可以有效地改善酶处理的大豆基胶粘剂的性能，这可能为制备具有高粘合性和耐水性的大豆基胶粘剂提供新的选择。

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