ANALYSIS OF THE INFLUENCE OF FIRE RETARDANTS ON THE CURING OF ADHESIVES IN PLYWOOD PRODUCTION

UDC 674.812-419

Leonovich Oleg Konstantinovich – PhD (Engineering), Assistant Professor, the Department of Woodworking Technology. Belarusian State Technological University (13a Sverdlova str., 220006, Minsk, Republic of Belarus). E-mail: OKL2001@mail.ru

Konyakhina Olga Vadimovna – Master’s degree student, the Department of Woodworking Technology. Belarusian State Technological University (13a Sverdlova str., 220006, Minsk, Republic of Belarus). E-mail: ikarija88@mail.ru

DOI: https://doi.org/ 10.52065/2519-402X-2025-288-12.

Key words: plywood, fire retardant, adhesion, resin, strength, fire resistance.

For citation: Leonovich O. K., Konyakhina O. V. Analysis of the influence of fire retardants on the curing of adhesives in plywood production. Proceedings of BSTU, issue 1, Forestry. Nature Management. Processing Renewable Resources, 2025, no. 1 (288), pp. 114–124 (In Russian). DOI: 10.52065/2519-402X-2025-288-12.

Abstract

The article discusses studies aimed at studying the influence of various basic flame retardants on the parameters of the gelatinization process of adhesive compositions used in the production of plywood. Methods for increasing the fire resistance of plywood are analyzed by impregnating veneer with fire retardant compounds before gluing, introducing fire inhibitors into the glue, impregnating plywood in autoclaves under vacuum, and surface treatment with flame retardants. The basic mechanisms of fire protection and suppression of wood smoldering are given. It has been noted that when using fire retardants, the adhesion of adhesives to the surface of impregnated veneer is significantly reduced. Various options for the use of fire retardants are described, affecting the speed of gluing and adhesion to wood material. It is emphasized that the use of fluoride and boron compounds significantly reduces the strength of the adhesive joint. The influence of these components when using phenolic and phenolresorcinol resins as binders and the change in curing kinetics when using ammonium salts are considered. It has been observed that the use of sodium fluoride significantly slows down the curing of binders. It is proposed to continue research on increasing the fire resistance of plywood based on urea-formaldehyde resin using various adhesive compositions and modifications with depolymerized hydrolytic lignin and to propose options for fire retardants that do not weaken the adhesion of binders and wood material. In solving a multi-aspect problem, focus on finding possible advantages that may arise when using a fire retardant in combination with a modifier.

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