碱木素硫化反应以及木素酚醛树脂固化性能的研究

Sulfuration Reaction of Soda Lignin and Adhesion Properties of Lignin-phenol-formaldehyde Resin

在碱性条件下对麦草碱木素进行硫化处理 ,降低其平均相对分子质量 ,脱除部分甲氧基 ,并增加芳香环上可反应官能团含量 ,以达到增加其反应活性的目的。实验表明 ,在硫用量 4%、加碱量 1 %、反应温度1 90℃、保温时间 1 5min条件下 ,获得的改性碱木素与苯酚、甲醛在酸性条件下反应制得的树脂具有较好的固化强度。

Wheat straw soda lignin was sulfurized in alkaline medium.A decrease in relative molecular mass and content of methoxyl group and an increase in the content of phonolic hydroxyl was observed.The reactivity of lignin was improved by the sulfuration treatment.The influence of the reaction conditions on the structural characteristics of lignin was studied.The experiments results indicate that the optimum reaction condition for the sulfuration process was:4% sulfur, 1% alkali,at 190℃ for 15 min.The strength of the lignin-phenol formaldehyde resin was increased when soda lignin was replaced by sulfurized soda lignin.The modification product can be used in plugging highly conductive subterranean zones of high temperature.