| Autor: |
Tsvetkova, I. N., Krasil'nikova, L. N., Khoroshavina, Y. V., Galushko, A. S., Frantsuzova Yu, V., Kychkin, A. K., Shilova, O. A. |
| Zdroj: |
Journal of Sol-Gel Science & Technology; Nov2019, Vol. 92 Issue 2, p474-483, 10p |
| Abstrakt: |
Tetraethoxysilane-derived silica sols stable to sedimentation as well as kinetically and "sol-gel@paint" compositions based on beeswax dissolved in tetraethoxysilane with addition of polyorganosiloxanes, siloxane block copolymer, and hydrophobized aerosil synthesized within this study served as a base for the development of a new technique for preparation of coniferous wood protective coatings. The surface morphology of the coatings was investigated along with their chemical composition, hydrophobicity/hydrophilicity, and adhesion and water absorption. The laboratory tests for biostability with respect to wood-destroying fungi and full-scale climatic tests in the conditions of Extreme North of Russia were performed upon the pine wood coated with developed coatings and their results are presented in this study. Highlights: New two-layer wood protective coatings based on silica sols, wax, and siloxanes were developed A SiO2 matrix is shown to be a film-forming basis with the wax serving only as a chemically unbound filler All coatings developed reduced the water absorption of wood significantly (15–35% vs. 98%) Both wax and siloxane block copolymer contribute to maintaining a high hydrophobicity level of the coatings The solution of H3BO3 in glycerin used as a modifier increases weatherability and funginertness of the coatings [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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