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| Preparation and performance of cold-pressed walnut cake based wood adhesive |
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| DOI：10.12166/j.zgyz.1003-7969/2019.11.022 |
| KeyWord:walnut cake wood adhesive preparation performance |
| FundProject:云南省教育厅科学研究基金项目（2018JS336） |
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| Abstract: |
| In order to improve the water resistance of protein based wood adhesive, the branched polymers(PEI) was used as modifier, walnut cake with 160 meshes was employed as raw material, the effects of reaction conditions and PEI dosage on bond strength of plywood were investigated by heating under alkaline conditions. Meanwhile, the curing characteristic of adhesive with different PEI dosage was analyzed by DSC, and the functional groups before and after curing were investigated by FT-IR.The results indicated that the adhesive prepared under the conditions of PEI dosage 30%-40%, pretreatment temperature 90 ℃ and pretreatment time 1 h could meet plywood standard of III type.Overall, the more the PEI dosage was added, the higher the curing peak temperature was, which meant the higher the degree of chemical reaction, the better the improvement of the bond strength. FT-IR results showed that chemical bonding between active amino and imino groups in PEI and carboxyl and amino groups in protein of walnut cake pyrolytic solution existed during curing process.Therefore, PEI was helpful for improvement of water resistance and bond strength of walnut cake based wood adhesive. |
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