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在树脂制备过程中,用木素磺酸钠(SL)替代苯酚(CP),用戊二醛替代甲醛,除了形成木素磺酸钠-甲醛树脂和苯酚-甲醛树脂之外,还形成了一种新的热固性酚醛树脂——木素磺酸钠-戊二醛树脂。利用这些树脂制备热固性材料,并用剑麻纤维增强得到复合材料。用反气相色谱法、热重分析法、冲击实验以及挠曲实验分析了原材料和/或热固性材料及复合材料的性质。在复合材料基质制备中,用SL替代CP,可使相对应的复合材料的冲击强度从400 J/m提高到800～1000 J/m,这表明用SL替代CP可大大提高冲击强度。当用SL制备树脂时,剑麻纤维的可湿性增强,复合材料的纤维-基质界面的黏附力更强,有利于冲击过程中负荷从基质转移到纤维上。当进行冲击实验和挠曲实验时,负荷从基质到纤维的转移机理不同。热重分析结果显示,在制备基质过程中用SL作为酚醛型试剂不会影响复合材料的热稳定性。
In the preparation of the resin, phenol (CP) was replaced by sodium lignin sulfonate (SL) and glutaraldehyde was substituted for formaldehyde. In addition to the formation of sodium lignosulfonate-formaldehyde resin and phenol-formaldehyde resin, New thermosetting phenolic resin - sodium lignosulphonate - glutaraldehyde resin. Thermosetting materials were prepared using these resins and the composite was reinforced with sisal fibers. The properties of raw and / or thermosetting materials and composites were analyzed by inverse gas chromatography, thermogravimetric analysis, impact testing and flexing experiments. In the preparation of composite matrix, the substitution of CP for CP with SL could increase the impact strength of the corresponding composites from 400 J / m to 800 ~ 1000 J / m, which indicated that the substitution of CP with CP could greatly improve the impact strength. When SL was used to prepare resins, the wettability of sisal fibers was enhanced, and the composite had stronger adhesion at the fiber-matrix interface, which facilitated the transfer of load from the matrix to the fibers during impact. When conducting impact experiments and flexing experiments, the mechanism of load transfer from matrix to fiber is different. Thermogravimetric analysis showed that the use of SL as a phenolic reagent in the preparation of matrix did not affect the thermal stability of the composites.