Effects of sepiolite addition to acrylic-latex paint on pull-off adhesion strength in nanosilver-impregnated and thermally-modified beech (Fagus orientalis L.) wood

Hamid R Taghiyari ¹, Petar Antov ², Abolfazl Soltani ³

¹Wood Science and Technology Department, Faculty of Materials Engineering &Interdisciplinary Sciences, Shahid Rajaee Teacher Training University (SRTTU), Tehran, 16788-15811, Iran. htaghiyari@sru.ac.ir.
²Department of Mechanical Wood Technology, Faculty of Forest Industry, University of Forestry, 1797, Sofia, Bulgaria.
³Department of Civil Engineering - Geotechnics, Faculty of Civil Engineering, Shahid Rajaee Teacher Training University (SRTTU), Tehran, 16788-15811, Iran.
⁴Department of Geography, Tourism, and Territorial Planning, Faculty of Geography, Tourism, and Sport, University of Oradea, 410087, Oradea, Romania. dilies@uoradea.ro.
⁵Department of Wood & Paper Science and Technology, Faculty of Natural Resources, University of Tehran, Karaj, 77871-31587, Iran.
⁶Department of Wood Industry, Faculty of Applied Sciences, Universiti Teknologi MARA (UiTM) Cawangan Pahang, 26400, Bandar Tun Razak, Malaysia.
⁷Laboratory of Biopolymer and Derivatives, Institute of Tropical Forestry and Forest Product, Universiti Putra Malaysia (UPM), 43400, Serdang, Malaysia.
⁸Department of Geography, Tourism, and Territorial Planning, Faculty of Geography, Tourism, and Sport, University of Oradea, 410087, Oradea, Romania.
⁹Department of Textiles, Leather and Industrial Management, Faculty of Energy Engineering and Industrial Management, University of Oradea, 410058, Oradea, Romania.

⁰Wood Science and Technology Department, Faculty of Materials Engineering &Interdisciplinary Sciences, Shahid Rajaee Teacher Training University (SRTTU), Tehran, 16788-15811, Iran. htaghiyari@sru.ac.ir.

Scientific Reports +

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February 20, 2024

View abstract on PubMed

Summary

Adding sepiolite to acrylic-latex paint decreased pull-off adhesion strength in wood coatings. Thermal modification also reduced adhesion, mainly due to wood polymer degradation.

Area Of Science

Materials Science
Wood Science
Coating Technology

Background

Sepiolite, a silicate mineral, enhances fire properties in solid wood coatings.
Pull-off adhesion strength is critical for paint and finish performance in furniture and heritage restoration.
Understanding sepiolite's impact on adhesion is vital for optimizing wood coating applications.

Purpose Of The Study

To investigate the effect of sepiolite on the pull-off adhesion strength of acrylic-latex paint on wood.
To evaluate how thermal modification and silver nano-suspension impregnation influence this adhesion.
To determine the combined effects of sepiolite, thermal treatment, and nano-suspension on wood coating adhesion.

Main Methods

Acrylic-latex paint with 10% sepiolite was applied to beech wood specimens.
Specimens were either unimpregnated or impregnated with silver nano-suspension.
Treated specimens underwent thermal modification at 185°C for 4 hours.
Pull-off adhesion strength was measured for all treatment combinations.

Main Results

Thermal modification significantly decreased pull-off adhesion strength, attributed to cell-wall polymer degradation (hemicelluloses) and altered lignin properties.
Sepiolite addition generally decreased adhesion across all treatments, though not always statistically significant.
The most significant adhesion decrease due to sepiolite was 21% in unimpregnated wood, while the least was 4% in thermally modified, nano-suspension-impregnated wood.

Conclusions

Thermal modification negatively impacts wood coating adhesion due to material degradation.
Sepiolite's effect on adhesion is generally negative, but its significance varies with other treatments.
Further research is needed on sepiolite in diverse coating systems to draw firm conclusions.

Keywords:

Coating and finish Paint pull-off strength Porous structure Sepiolite Silver nano-suspension Thermal modification