Improving the Physical and Mechanical Performance of Laminated Wooden Structures by Low-Temperature Plasma Treatment

Ruslan Rushanovich Safin,Ruslan Khasanshin,Regina Salimgaraeva,Shamil Mukhametzyanov,Albina Safina,Natalia Kraysman,Nour Galyavetdinov

doi:10.3390/coatings11080918

Ruslan Rushanovich Safin, Ruslan Khasanshin + Show 5 more

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https://doi.org/10.3390/coatings11080918

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Journal: Coatings	Publication Date: Jul 30, 2021
Citations: 4	License type: CC BY 4.0

Affiliation: Kazan State Technological University

Abstract

This paper considers the effect of RF plasma on wood in improving the adhesion of binders to wood by increasing its surface wettability. Our study reveals that radiofrequency (RF) plasma treatment causes a greater than threefold decrease in the marginal wetting angle of wood. The greatest effect is achieved in RF plasma treatment in argon, which is on average 5% greater than that of RF plasma treatment in air or in propane/nitrogen mixture. In addition, the power of the RF plasma torch has the greatest influence, and the main influence comes from the voltage applied to the RF plasma torch; current does not have such a significant effect. To achieve a significant effect, the duration of exposure should be at least 5 min, with a total power of 4.05 kW. Studies have been conducted to determine the adhesive strength of wood. An increase in the strength of laminated beams made from RF-treated bars in relation to control samples was found. The greatest impact on the adhesion strength was revealed when using PVA-based glue, compared with the use of polyurethane-based adhesives and urea-formaldehyde resin.

Highlights

Galyavetdinov, N.; Salimgaraeva, R.; Abstract: This paper considers the effect of RF plasma on wood in improving the adhesion of binders to wood by increasing its surface wettability
This study aims at improving the adhesive properties of wood by increasing the wettability and adhesive strength of wood during radiofrequency plasma treatment
The results of the study of changes in the marginal wetting angle of wood depending on the duration of reduced-pressure RF plasma treatment in three plasma gases air) are are shown

Summary

Introduction

Galyavetdinov, N.; Salimgaraeva, R.; Abstract: This paper considers the effect of RF plasma on wood in improving the adhesion of binders to wood by increasing its surface wettability. The most promising area of application is large-span laminated wooden structures. The range of manufactured products includes beams, trusses, frames, and arch-type, large-span laminated wooden structures. The use of large-span laminated wooden structures reduces the cost of covering construction by almost one-third in comparison with more traditional structures made of metal and reinforced concrete. Despite all of these existing positive aspects, wood itself, as a material, has many disadvantages that limit its applicability to one degree or another, including in the production of large-span laminated wooden structures. A number of wood species have poor adhesion to some adhesives, which is a significant disadvantage, since this characteristic is important in the production of large-span laminated wooden structures, where the quality of the adhesive layer plays an important role. Above, it can be concluded that increasing the physical and mechanical qualities of lowgrade wood and increasing its adhesive qualities should be considered among the main issues to be addressed in the construction industry [1,2,3,4]

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