METHOD OF PRODUCTION OF ADHESIVE FOR PRODUCTION OF LAMINATED TIMBER BEAM Russian patent published in 2014 - IPC C09J161/28 C08L61/28 B27G11/00 

FIELD: woodworking industry.

SUBSTANCE: method of production of adhesive comprises the steps of loading of formaldehyde-containing component, a modifier, melamine, urea, heating the reaction mixture, exposure, adding ammonium chloride to pH of 4.9-5.1 of the mixture, cooling, adjusting the mixture with the modifier solution to pH 9.8-10. 2. And formaldehyde-containing component, a modifier, ethylene glycol and melamine is loaded at first, and then heating of the reaction mixture, exposure, cooling is carried out, then urea is loaded, then ammonium chloride is added, the mixture is cooled and adjusted with the modifier solution to pH 9.8-10.2. And the formaldehyde-containing component is used as urea-formaldehyde concentrate, and the modifier - as polyfunctional organic acid salt.

EFFECT: processing of urea-formaldehyde concentrate with the modifier enables to prevent the Cannizzaro reaction, which ultimately reduces the consumption of melamine and free formaldehyde content while maintaining the technological properties of the adhesive resin.

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