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Study of the adhesion of silicate-based coating formulations on a wood substrate
ID Cheumani-Yona, Arnaud Maxime (Author), ID Žigon, Jure (Author), ID Dahle, Sebastian (Author), ID Petrič, Marko (Author)

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Abstract
Silicate coatings are environmentally friendly inorganic-based products that have long been used for mineral substrates and protection of steel against corrosion. The development and acceptance of these coatings in the wood sector require some adjustments in formulations or special preparation of the surface to be coated to obtain durable finishes. In this work, the adhesion of various silicate-based formulations to a beech wood substrate (Fagus sylvatica L.), was assessed with the main objective to study relevant parameters and potential improvements. Adhesion strength was determined by pull-off and cross-cut tests. Other coating properties such as scratch, impact, and water resistance were also determined. Surface roughness and interface were analyzed using confocal laser scanning microscopy (CLSM) and scanning electron microscopy (SEM), and coating curing was studied by attenuated total reflection-infrared spectroscopy (ATR FTIR). The results showed that adhesion was highly dependent on formulation, penetration of the coatings into wood, and mechanical anchoring. Increasing the content of solid particles in the coating formulations or adding a polyol (glycerol, xylose), which probably acted as a coalescent, considerably decreased the adhesion strength, probably by blocking penetration into the wood by forming aggregates. Adhesion was improved by pre-mineralization of the surface, and substitution of a part of the potassium silicate binder with potassium methyl siliconate reduced the formation of cracks caused by dimensional instability of the wood.

Language:English
Keywords:coating, silicate, water glass, wood, potassium methyl siliconate, adhesion
Work type:Article
Typology:1.01 - Original Scientific Article
Organization:BF - Biotechnical Faculty
Publication status:Published
Publication version:Version of Record
Year:2021
Number of pages:15 str.
Numbering:Vol. 11, iss. 1, art. 61
PID:20.500.12556/RUL-127539 This link opens in a new window
UDC:630*829
ISSN on article:2079-6412
DOI:10.3390/coatings11010061 This link opens in a new window
COBISS.SI-ID:46144771 This link opens in a new window
Publication date in RUL:14.06.2021
Views:629
Downloads:154
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Record is a part of a journal

Title:Coatings
Shortened title:Coatings
Publisher:MDPI AG
ISSN:2079-6412
COBISS.SI-ID:523035673 This link opens in a new window

Licences

License:CC BY 4.0, Creative Commons Attribution 4.0 International
Link:http://creativecommons.org/licenses/by/4.0/
Description:This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.
Licensing start date:07.01.2021

Secondary language

Language:Slovenian
Keywords:premazi, silikati, les, kalijev metil silikonat, oprijem

Projects

Funder:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije
Project number:N4-0117
Name:Silikatni premazi za les z odlično trajnostjo

Funder:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije
Project number:P4-0015
Name:Les in lignocelulozni kompoziti

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