Scholarly record
OZONE PROCESSING AS A METHOD FOR INCREASING ADHESIONAL PROPERTIES OF WOOD
Abstract
One of the most common areas of wood use is the creation of composite materials based on it. Moreover, active research on preliminary heat treatment of wood filler in the production of various composites has been carried out in recent years. This is due to the fact that heat treatment of wood is an environmentally friendly method that allows changing its color and performance properties, as well as reduce various negative factors: the impact of fungi and other biological organisms, shrinkage and warping in conditions of variable humidity. However, it is known that the process of heat treatment of wood increases water repellency, leads to poor wettability, thereby causing poor adhesion of adhesives to the surface of the wood. In this regard, studies on the ozonation of the surface of natural and thermally modified wood in order to increase the adhesive properties during bonding have been carried out, since it is known that ozone can be used to break down lignin and hemicellulose in many lignocellulosic materials. Ozone pretreatment has the following advantages: under the influence of ozone in polymer solutions, there is a decrease in molecular weight and saturation of oxygen-containing functional groups; ozone is a strong oxidative electrophilic reagent that interacts with lignin by double bonds, which effectively removes lignin. As a result of this pretreatment, no toxic products are formed for the subsequent process; the reaction is carried out at room temperature and atmospheric pressure. Thus, the purpose of this work is to conduct the ozonation process to improve the adhesion properties of the surface layer of birch wood veneer and reduce the consumption of glue during bonding, which will reduce the emission of harmful substances. Wettability tests were carried out for a control sample of natural and thermally modified wood, as well as for a sample of natural and thermally modified wood treated with ozone. The limiting wetting angle of the surface of birch veneer was experimentally determined by the sessile drop method with subsequent photofixation. As a result of the images obtained, graphical dependences of the influence of the duration of ozone treatment on the limiting wetting angle of various samples were constructed and the following results were established: for 10 seconds, it is observed that the limiting wetting angle of the drop on the control sample of thermally modified wood remains virtually unchanged, while the limiting wetting angle of the sample of thermally modified veneer treated with ozone rapidly decreases and reaches zero. Similar results are observed for natural wood veneer samples. However, it can be noted that the values of the limiting wetting angle of the veneer samples of thermally modified wood are higher than the values of the samples of natural wood veneer. Thus, it can be concluded that ozonation increases the surface wettability of the cellulose-containing material, which suggests the possibility of production.
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References15
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