APPLICATIONS OF POLYCARBOXYLATE LIGNINS IN THE SYNTHESIS OF UREA-FORMALDEHYDE RESINS

UDC 678.652’41’21:665.947.4

  • Kazhamiaka Aleksandr Aleksandrovich – external doctorate student, Deputy General Director for Production. JSC “Vitebskdrev” (7, Stakhanovskiy lane, 210008, Vitebsk, Republic of Belarus). E-mail: kozhemyako.a@wood.by

  • Kuzemkin Dmitriy Vladimirovich – PhD (Engineering), Assistant Professor, the Department of Oil and Gas Processing and Petroleum Chemistry. Belarusian State Technological University (13a, Sverdlova str., 220006, Minsk, Republic of Belarus). E-mail: kuziomkin@mail.ru

  • Gonchar Aleksandr Nikolaevich – Deputy Director for Scientific Work. SynergyCom SOOO (5, Urozhaynaya str., 247484, Prigorodnaya village, Rechitskiy district, Gomel region, Republic of Belarus). E-mail: agonchar@synergyhorizon.com

  • Dubodelova Ekaterina Vladimirovna – PhD (Engineering), Assistant Professor, the Department of Woodworking Technology. Belarusian State Technological University (13a, Sverdlova str., 220006, Minsk, Republic of Belarus). E-mail: katedubodelova@tut.by

  • Shpak Sergey Ivanovich – PhD (Engineering), Assistant Professor, the Department of Chemical Processing of Wood. Belarusian State Technological University (13a, Sverdlova str., 220006, Minsk, Republic of Belarus). E-mail: spak_s@belstu.by

DOI: https://doi.org/10.52065/2520-2669-2023-265-1-12

Keywords: polycarboxylate lignin, urea-formaldehyde resin, synthesis, particle boards, free formaldehyde content, tensile strength.

For citation: Kazhamiaka А. А., Kuzemkin D. V., Gonchar А. N., Dubodelova E. V., Shpak S. I. Applications of polycarboxylate lignins in the synthesis of urea-formaldehyde resins. Proceedings of BSTU, issue 2, Chemical Engineering, Biotechnologies, Geoecology, 2023, no. 1 (265), pp. 104–111. DOI: https://doi.org/10.52065/2520-2669-2023-265-1-12 (In Russian).

Abstract

Compositions of urea-formaldehyde (UF) resin modified with polycarboxylate lignin for particle boards have been developed. Valorization products of acidic and alkaline nature based on hydrolysis lignin marketed by SynergyCom SOOO under the brand name S-Drill™ BND have been used to promote the formation of a branched structure with an increased amount of methylol groups in the resulting oligomers by adjusting the concentration of hydrogen ions at different stages of resin synthesis. Tests of the modified UF resins showed that free formaldehyde content in the modified resin after synthesis over a period of 24 hours decreases with a lower intensity compared to the control sample by 70.0 and 57.6%, respectively. At the same time, the gelatinization time at 100°C increases by 31.4% for the control resin sample, and for the experimental one, by 2.6%. Samples of particle boards obtained using urea-formaldehyde resin modified with polycarboxylate lignin met the requirements of GOST 10632‒2014 for grade R1. For samples of particle boards on experimental resins, an increase in tensile strength perpendicular to the face by an average of 43% was observed, which indicates a high level of adhesion of the modified resins to the wood substrate. The results of the research have passed a comprehensive semi-industrial approbation at JSC “Rechitsadrev”.

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18.11.2022