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| Preparation of epoxy soybean oil wood adhesive and optimization of its hot-pressing process |
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| KeyWord:epoxy soybean oil maleic anhydride water resistance hot-pressing process adhesive performance |
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| Abstract: |
| In order to develop environmentally friendly and renewable adhesives with excellent water resistance, with epoxy soybean oil (ESO) as raw material, maleic anhydride (MA) as curing agent and zinc acetylacetonate (Zn(acac)2) as catalyst, ESO wood adhesive and poplar plywood were prepared. The effect of MA dosage on the performence of adhesive was studied. The catalyst dosage was optimized by DSC analysis, and the adhesive was analyzed by infrared spectroscopy and TG/DTG. Then, the hot-pressing process was optimized by orthogonal experiment. The results showed that the best adhesive performance was achieved at 27% of MA dosage. The optimal dosage of catalyst was 3%. Infrared spectroscopy and TG/DTG analysis proved that ESO underwent crosslinking and curing reaction with MA. The optimal hot-pressing process conditions were obtained as follows: hot-pressing temperature 150 ℃, hot-pressing time 10 min, hot-pressing pressure 2 MPa, and glue spread 320 g/m2. Under these conditions, the wet bonding strength was 1.613 MPa, which was in line with the national requirement of Class Ⅱ ordinary plywood（≥0.70 MPa）. The preparation method of adhesive has advantages such as simplicity, efficiency and environmental friendliness, and it is a promising strategy for achieving sustainable application of ESO in wood product production, with great industrial application potential. |
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