环氧树脂掺杂对地质聚合物木材胶黏剂性能的影响

Effects of epoxy resin doping on properties of geopolymer wood adhesive

【目的】为了解决地质聚合物木材胶黏剂的界面相容性差等问题,采用环氧树脂为有机掺杂剂构建有机–无机交联网络的方法,研究环氧树脂掺杂对地质聚合物木材胶黏剂综合性能的影响。【方法】将地质聚合物与环氧树脂、聚醚胺、硅烷偶联剂KH550共混制备地质聚合物基木材胶黏剂,分析不同有机掺杂剂对胶黏剂性能的影响作用,结合FTIR、XPS、SEM-EDS和锥形量热仪等分析有机掺杂剂的作用机制。【结果】不同有机物掺杂均会提高地质聚合物浆体的黏度,当环氧树脂和聚醚胺的质量分数分别为4.8%和1.2%(GECS6)时,地质聚合物浆体黏度较低,有利于均匀施胶。不同物质掺杂均会不同程度地提高地质聚合物基胶合板的胶合强度,GECS6的湿态胶合强度达到较优值0.87 MPa,相比于纯地质聚合物胶黏剂提高了248%。相较于纯地质聚合物,有机掺杂地质聚合物胶合板的热释放速率和总热释放量分别下降了7.01%和17.95%,阻燃性能得到一定程度的提高。【结论】环氧树脂与硅烷偶联剂协同作用,构建了有机–无机交联网络,提高了地质聚合物胶黏剂与木材的相容性及浆体的致密性,解决了地质聚合物木材胶黏剂的界面相容性差的问题,从而增强了胶合板的胶合强度和阻燃性能。

[Objective]In order to solve the problems of poor interfacial compatibility of geopolymer wood adhesive,epoxy resin was used as an organic dopant to construct organic-inorganic crosslinking network,so as to improve the comprehensive performance of epoxy resin doping on geopolymer wood adhesive.[Method]Geopolymer-based wood adhesive was prepared by blending geopolymer with epoxy resin,polyether amine,and silane coupling agent KH550.The effects of different organic dopants on performance of the adhesive were analyzed,and the mechanism of organic dopants was analyzed by combining FTIR,XPS,SEM-EDS,and conical calorimeter.[Result]Different organic doping improved the viscosity of geopolymer slurry.Given the mass fraction of epoxy resin of 4.8%and polyether amine of 1.2%(GECS6),the viscosity of geopolymer slurry was lower,which was conducive to the uniform application of adhesive.Different doping substances improved the bond strength of geopolymer-based plywood to varying degrees.The wet bond strength of GECS6 reached a better value of 0.87 MPa,which was higher than that of pure geopolymer adhesive by 248%.Compared with pure geopolymer adhesive,the heat release rate and total heat release of the organically doped geopolymer plywood decreased by 7.01%and 17.95%,respectively,and the fire resistance properties were improved to a certain extent.[Conclusion]The synergistic effect of epoxy resin and silane coupling agent constructs an organic-inorganic crosslinking network,which can improve the compatibility between geopolymer adhesive and wood,improve the densification of paste,and solve the problem of poor interfacial compatibility of geopolymer wood adhesive,thus enhance bond strength and fire resistance of plywoods.