Preparation method of modified biomass liquefaction resin adhesive with high water resistance

Abstract

The invention relates to a preparation method of a modified biomass liquefaction resin adhesive with high water resistance. The method comprises the following technological steps: Step 1, preparation of a biomass phenol liquefaction product; Step 2, preparation of biomass phenol liquefaction formaldehyde resin, namely a component A; Step 3, preparation of melamine urea-formaldehyde resin, namely a component B; and Step 4, preparation of the modified biomass liquefaction resin adhesive with high water resistance. The invention has advantages as follows: the modified biomass liquefaction resin adhesive with high water resistance is stable to store; a sizing technology and a hot-pressing technology of the adhesive provided by the invention are the same as those of a traditional phenolic resin adhesive; cost is low; toxicity is low; and water-resistant bonding strength of the biomass liquefaction resin adhesive can be greatly enhanced. It shows through tests that bonding strength mean value of a poplar plywood form test piece prepared from the adhesive prepared by the method reaches more than 1.5MPa after the poplar plywood form test piece successively undergoes 4h of water boiling, 20h of drying at 63+ / -2 DEG C, 4h of water boiling and natural cooling.

Description

technical field [0001] The invention relates to the preparation of a highly water-resistant modified biomass liquefied resin adhesive for outdoor wood-based panels by using biomass materials such as peanut shells, camellia oleifera shells, bark powder, and walnut shells through phenol liquefaction, resinization, and modification technologies method. The invention belongs to the technical fields of comprehensive utilization of agricultural and forestry biomass and wood adhesives. Background technique [0002] Biomass materials such as peanut shells, camellia oleifera shells, bark powder, and walnut shells are rich in lignin, hemicellulose and other components, and their degree of polymerization is relatively low. They can be degraded under the liquefaction catalysis of phenol and strong acid. Reactive small molecular substances, and then react with formaldehyde to make biomass liquefied resin adhesive. Compared with traditional phenolic resins, this type of adhesive has the...

AI Technical Summary

Problems solved by technology

However, during the liquefaction conversion process of biomass materials, cellulose and some cellulose degradation products contain a large number of hydrophilic groups, and these hydrophilic groups cannot fully participate in the reaction with formaldehyde in the further resinification process. As a result, the water resistance of the biomass liquefied resin adhesive is not ideal, and it is not suitable for the production of outdoor high water resistance structural plywood, such as outdoor heavy bamboo flooring, ship plywood, container floor, train car floor, etc.