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| Performance evaluation of bonding system of walnut meal modified with glutaraldehyde |
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| DOI： |
| KeyWord:glutaraldehyde walnut meal bonding system performance evaluation |
| FundProject:国家级大学生创新训练项目 |
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| Abstract: |
| In order to prepare protein adhesive with excellent water resistance from walnut meal, a series of modified walnut meal bonding systems (MWMBS) were prepared with different amounts of glutaraldehyde as modifier. The basic properties, curing characteristics, bonding strength and structural characteristics were determined to evaluate the performance of the MWMBS. The results showed that the viscosity of MWMBS generally increased with the increase of amount of glutaraldehyde. The MWMBS had the appropriate cross-linking curing temperature, which can be completed within 160 ℃, especially when the amount of glutaraldehyde was 2.5%, the peak curing temperature was the lowest (123 ℃). The optimal bonding strength of plywood samples after 63 ℃ hot water treatment could reach 0.87 MPa, and the bonding system had excellent water resistance. Fourier infrared spectroscopy (FT-IR) analysis showed that aldehyde group (—COH) in glutaraldehyde could form good cross-linking with carboxyl group (—COOH) and amino group (—NH2) in walnut meal, which provided important support for the bonding strength and water resistance of the system. In conclusion, the MWMBS prepared with 2.5% glutaraldehyde exhibits superior performance. |
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