Study of properties of adhesive compositions based on melamine-urea-formaldehyde resin
https://doi.org/10.21266/2079-4304.2024.247.278-290
Abstract
The production of many materials and wood products depends on the technological operation of gluing. At the same time, the result of this technological operation is influenced by the characteristics of the adhesive composition, wood and external factors. To obtain a waterproof material, it is necessary to use a resin with appropriate indicators for gluing, for example, melamine urea formaldehyde resin with a melamine content of 20%. For a more detailed influence on the performance of products, it is possible to use various modifying additives. The nature of the interaction of adhesive compositions and wood is determined by the forces of mutual attraction of molecules, adhesion bonds are formed. When applying the adhesive composition on the surface of the veneer, the shape of the free surface of the liquid depends on the ratio of the surface tension forces at the phase boundary, on the intermolecular interaction of the adhesive composition with the surface of the veneer. To destroy the system of mutual attraction of the adhesive layer and the surface of the substrate, it is necessary to overcome the force by spending work (adhesion work). The study of the mechanism and basic patterns of interaction between the adhesive composition and the surface of the veneer during the application process will allow you to correctly select the amount and type of modifiers, adjusting the main characteristics of the adhesive composition and the surface of the veneer during the formation of the adhesive joint. To evaluate the work of adhesion and patterns of wetting and spreading, melamine urea formaldehyde resin and modifiers were used: technical aerosil, dolomite flour and technical lignosulfonates. The results of determining the critical surface tension and the work of adhesion are presented. It was determined that the optimal amount of modifiers is 10 mass parts. With this amount, good wetting ability is observed while ensuring the necessary strength of the finished product.
About the Author
E. G. Sokolova
St.Petersburg Forestry Technical University
Russian Federation
Russian Federation
SOKOLOVA Ekaterina G. – Associate Professor
194021. Institutsky line 5. St. Petersburg. Russia
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Review
For citations:
Sokolova E.G. Study of properties of adhesive compositions based on melamine-urea-formaldehyde resin. Izvestia Sankt-Peterburgskoj lesotehniceskoj akademii. 2024;1(247):278-290. (In Russ.) https://doi.org/10.21266/2079-4304.2024.247.278-290
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