Study on bonding properties of cellulose-based epoxy resin and its wood adhesive
Liquid cellulose-based epoxy resin(PHECEP)was synthesized by grafting liquefaction reaction with ethylene oxide(EO)using alkali activated cellulose as raw material.Then,using E-51 as the matrix resin,amine T31 as the curing agent,silica powder,silane coupling agent KH-560 and PHECEP as modifiers,cellulose-based epoxy resin adhesive was prepared,and its mechanical properties,thermal properties,and chemical resistance were tested.The research results showed that,when the addition amount of PHECEP was 20%,the impact strength increased from 2.9 kJ/m2 to 50.9 kJ/m2.When the addition amount of PHECEP was 5%,the tensile shear strength of cellulose-based adhesive cured for 7 d at room temperature was 171.1%higher than that of pure E-51.After adding PHECEP,the actual tensile shear strength was higher than the tested strength,and the tolerance was better in small molecule solvents.Through the comprehensive evaluation of mechanical properties,wet/dry bonding strength,thermal stability,and chemical resistance of PHECEP/E-51 materials,the relatively optimal formula of wood adhesive was obtained as follows:5%PHECEP(relative to the mass of E-51),1%KH-560,60%silica powder,and 18%T31 curing agent(relative to the total mass of PHECEP and E-51,respectively).
cellulosecellulose-based epoxy resinbisphenol A type epoxy resinwood adhesivebonding property
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