【摘要】 以尿素和纳米氧化镁(MgO)为改性剂,利用木质素部分替代苯酚,三步共聚制备了木质素基酚醛树脂胶粘剂,系统考察了尿素添加量、MgO添加量、木质素添加量等过程参数对木质素基酚醛树脂胶粘剂的密度、黏度、固含量和游离甲醛含量的影响,并采用FTIR和DSC对木质素基酚醛树脂胶粘剂官能团结构和热固化特性进行表征。结果表明,在尿素和MgO协同催化作用下,木质素添加量可以提高到45%,并且热固化性能显著提高。更多还原

【Abstract】 Urea and nano-MgO as modifiers,phenol was partially replaced by the lignin,and lignin-based phenolic resin binder was prepared by a three-step copolymerization.The density,viscosity,solid content and free formaldehyde content of the lignin-based phenolic resin adhesive were investigated systematically by the process parameters,including urea addition,MgO addition and lignin addition.The functional structure and thermal curing characteristics for lignin-based phenolic resin adhesive were characterized by FTIR and DSC,respectively.The results demonstrated that under the synergistic catalysis of urea and MgO,lignin addition could be increased to 45%,and the thermal curing performance was remarkably improved.更多还原