engleski

Influence of Liquefied Wood pH Values As a Hardener on Particleboards Properties

Wood liquefaction is a new technique of chemical wood processing, and its aim is to convert wood material in environment frendly and biodegradable polymer materials, and increase percentage of its utilization. Nowdays, according to previous published researches, maximum attention attracted wood liquefaction in presence of some organic reagents and the most interesting are two methods. The first method is the preparation in presence of phenol, which resulted in liquefaction products rich with phenol units. The second liquefaction method was achieved in presence of polyhydric alcohols. Wood composite materials and fragmented wood-based panels (particleboards, fibreboards, OSB, MDF, WPC and other panels) are materials of the future. With their wide spectra of potential applications these materials occupy almost all fields of use. Quality of wood composite materials does not exclusively depend on wood species and their properties applied in production, but with application of other essential non-wooden synthetic chemical components, such as a different types of resins and adhesives, hardeners and paraffin emulsion, which were designed in accordance with the requirements of everyday use and utilisation demands. According to above, this research has focused on the possibility of using liquefied wood (LW) as a hardener in particleboards production, and the impact of different LW pH values on the polymer structure and adhesion-cohesion properties of polymerization of urea-formaldehyde (UF) and melamine-urea- formaldehyde (MUF) adhesives. Furthermore, aim of this research was also the influence of mentioned new adhesion system on the particleboards physical and mechanical properties, and formaldehyde emission.

Liquefied wood; Particleboards; Hardeners; Urea- and Melamine-Urea Formaldehyde Resins

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