EVALUATION OF THE DURABILITY OF WATER-DISPERSION LACQUER VD AK11L WHEN PAINTING OAK WOOD

UDC 678.4.023

  • Kopylova Tamara Ignatievna − Director of the Unitary Enterprise Arsen (90a-7a, R. Luxemburg str., 220036, Minsk, Republic of Belarus). E-mail: ta3110@mail.ru

  • Guzii Sergii Grygorovych − PhD (Engineering), Senior researcher, the Department of fire prevention in settlements. National University of Civil Defence of Ukraine (94, Chernishevska str., Kharkiv, 61023, Ukraine). E-mail: guziy@nuczu.edu.ua

  • Bazhelka Ihar Konstantirovich − PhD (Engineering), Assistant Professor, Head of the Department of Woodworking Technology. Belarusian State Technological University (13a, Sverdlova str., 220006, Minsk, Republic of Belarus). E-mail: bikbstu@mail.ru

  • Kanavalava Anastasiya Alexandrovna − Master’s degree student. Belarusian State Technological University (13a, Sverdlova str., 220006, Minsk, Republic of Belarus). E-mail: anastasiyakonov@gmail.com

DOI: https://doi.org/10.52065/2519-402X-2021-246-30-236–241

Key words: adhesion, acrylic lacquer, weatherability, oak, period of operation.

For citation: Kopylova T. I., Guzii S. G., Bazhelka I. K., Kanavalava A. A. Evaluation of the durability of water-dispersion lacquer VD AK11L when painting oak wood. Proceedings of BSTU, issue 1, Forestry. Nature Management. Processing of Renewable Resources, 2021, no. 2 (226), pp. 236–241 (In Russian). DOI: https://doi.org/10.52065/2519-402X-2021-246-30-236–241.

Abstract

The paper presents the results of full-scale and accelerated tests on the durability assessment of VD AK11L water-dispersion varnish applied to oak wood. During the period from three to six months of holding the samples in atmospheric conditions, no changes were noted in both the continuity of the varnish film and the color of the substrate. In the period from six to nine months, the varnish film does not deteriorate, but darkening of the oak wood is recorded. On the twelfth month of testing, there is a 22.5-fold decrease in the adhesion of the film to the substrate in comparison with the control sample. The weakening of the varnish film is associated with destructive processes from the action of solar radiation. A year of full-scale tests corresponds to 10 years of operation. After 100 cycles of accelerated tests, no changes were found in both the continuity of the varnish and the adhesion of the film to the substrate. After 75 cycles of accelerated tests, an increase in the mass of the samples by 7.64% is observed in comparison with the control composition due to an increase in the water saturation of the film due to the weakening of bonds between polymer molecules. The design life of the coating is (12.6 ± 10)% years. The error between the two test methods does not exceed 12.6%. After a year of storage in a closed container, the dynamic viscosity increases 2.15 times compared to the initial one. However, the varnish can be freely applied to the oak surface due to minor shear forces from 7.82 to 63.47 dyne/cm2 in the speed range from 0.106 to 0.954 1/sec.

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20.03.2021