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以玉米淀粉为接枝骨架,过硫酸铵为引发剂,与接枝单体乙酸乙烯酯-丙烯酸乙酯进行接枝共聚反应,制取淀粉基木材胶粘剂。对得到的淀粉接枝共聚物进行了表征分析及性能研究。IR谱图表明,样品除了保持淀粉的特征吸收峰外,在1730～1740cm-1之间出现了羰基特征吸收峰;X-粉末衍射谱图表明,样品多为弥散峰,证明淀粉接枝共聚物基本为少量结晶态与无定形态共存的结构;TG、DTA曲线证实了接枝共聚反应的发生,且淀粉接枝共聚物的热稳定性优于纯玉米淀粉;性能测试结果表明,制备的胶粘剂具有较好的高温稳定性、粘接性、耐寒性和储存稳定性;各项指标已达到了国家标准HG/T2727-95中聚乙酸乙烯酯木材胶粘剂的性能指标,特别是压缩剪切干强度远远超过了国家标准。
Using starch as graft, ammonium persulfate as initiator, graft copolymerization with vinyl acetate-ethyl acrylate was carried out to prepare starch-based wood adhesive. The obtained starch graft copolymer was characterized and analyzed. The IR spectrum showed that the carbonyl group showed a characteristic absorption peak at 1730-1740 cm-1 in addition to the characteristic absorption peak of starch. The X-ray powder diffraction spectrum showed that the sample mostly had a dispersion peak, indicating that the starch graft copolymer The results of TG and DTA curves confirmed the graft copolymerization. The thermal stability of starch graft copolymers was better than that of pure corn starch. The results of the performance test showed that the prepared adhesives Has good high temperature stability, adhesiveness, cold resistance and storage stability; the indicators have reached the national standard HG / T2727-95 Polyvinyl acetate wood adhesive performance indicators, especially the compressive shear strength Far more than the national standard.