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ULTRAVIOLET TREATMENT FOR IMPROVING WOOD FILLER PHYSICAL PROPERTIES IN COMPOSITE PRODUCTION
Abstract
It is known that laminated wood structures are widely used in construction industry due to the advantages of the resulting monolithic composition. However, despite the large number of positive qualities, wood as a filler has certain disadvantages that can reduce the service life of products made of a wood composite material. Thus, wood filler in the process of hardening and drying of composite material, as well as during operation of structures made of this material, can alternately shrink and swell depending on atmospheric conditions, change shape and size, which contributes to occurrence of internal stresses and the destruction of contact zones, reducing the strength of the integral structure of the composite. Methods of modifying wood filler contribute to improving the performance of wood composite materials and expanding their application areas. Many researchers have confirmed that thermal modification of wood can increase its moisture resistance and biostability, reduce its hygroscopicity. However, heat treatment reduces the adhesion of the binder to the wood, which leads to an increase in pressure and time of pressing and affects the cost of the wood composite. At the same time, it is known that UV radiation affects the surface properties of organic materials. To this end, we have studied the influence of UV radiation on the wettability of thermally modified wood. It was found that UV irradiation of plywood samples increases the wettability of the surface of thermally modified wood, which subsequently has a positive effect on the adhesion of the binder. It was found that the optimal effect at a radiation power of 1.38W/m2 was achieved 60 minutes after the start of the treatment. The overall hygroscopicity of the wood practically does not change, remaining low after preliminary heat treatment. Based on the research, we suggested the two-stage wood filler modification technology in production of construction composite materials (laminated boards, glued products made of solid wood): the first stage included heat treatment over the entire thickness of the material, and the second stage -was UV surface treatment.
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