苯代三聚氰胺增韧改性三聚氰胺树脂的制备及光谱分析

利用三聚氰胺、甲醛和苯代三聚氰胺增韧剂在碱性条件下制备了改性三聚氰胺甲醛树脂(BG-MF)，并将其浸渍牛皮纸使用直接浸渍方法来制得层积板。研究加入不同添加量的苯代三聚氰胺对共缩聚树脂结构、结晶性、力学性能、耐燃烧、耐沸水等性能的影响。核磁共振氢谱图(1H-NMR)结果显示，改性后树脂BG-MF在化学位移δ7.0~7.6处出现了尖锐的特征峰，主要归属于苯代三聚氰胺中的苯环的氢质子峰；红外光谱(FTIR)结果显示，BG-MF红外结果除了与三聚氰胺甲醛树脂(MF)具有相同的特征吸附峰外，在1 557和774 cm-1出现了新的特征吸收峰，主要归属于苯代三聚氰胺中的苯环骨架的特征吸收峰，说明苯代三聚氰胺参与缩聚反应。X射线衍射图谱分析说明BG加入后晶型有轻微变化，主要是由于MF中含有N元素，有大量的氢键产生，进而形成不规则的部分微小晶体。改性后树脂用于浸渍层积板的制备，DMA测试结果显示，当BG含量达到15%时在137.2 ℃储能模量为20 228 MPa，比未改性MF树脂的峰顶储能模量17 050 MPa提高了18.6%，表明改性后树脂胶接强度提高。从拉伸实验结果可以看出，苯代三聚氰胺含量约为15%时，增韧效果最好。氧指数从36.2升高到38.4，表明苯代三聚氰胺的加入其阻燃性能有所增强。

Preparation and Spectral Analysis of Melanmine-Formaldehyde Resin Modified by Benzoguanamine

In this paper, the MF resin was modified by Benzoguanamine (BG). The effects of different dosage of BG on the molecular structure, tensile strength, elongation at break, resistance to combustion and boiling water resistance were respectively investigated in details. 1H-NMR spectra showed that, after the modification with benzoguanamine, the appearance of new proton signals at 7.0~7.6 ppm were attributed to the hydrogen protons of benzene ring. FTIR spectra showed that, after the modification with benzoguanamine, the appearance of 1 557 and 774 cm-1 in BG-MF resins were attributed to the skeleton vibration peak of benzene ring confirmed the success in the synthesis of BG-MF resin. X ray diffraction (XRD) analysis showed that crystal of BG-MF resin had a slight change, this was mainly due to the presence of a large amount of N elements in BG-MF, resulting in the formation of a large number of hydrogen bonds, thereby forming irregular local micro crystals. The DMA test results showed that, the peak storage modulus of MF resin was increased from 17 050 to 20 228 MPa when the BG content reaches 15%, indicating that the bonding strength of BG-MF resin was improved. The tensile strength and toughness of the dipping laminated plate were increased. The elongation at break was increased by 22% at the addition of 15% BG. The oxygen index was increased from 36.2 to 38.4, showing that the flame retardancy of BG-MF resin was improved. However, the boiling water resistance of BG-MF resin was not obvious.