Effect of weathering on wood treated with tall oil combined with some additives

Huseyin Sivrikaya,Ahmet Can

doi:10.4067/s0718-221x2016005000063

Abstract

Growing interest on bio-based material has led to focus on environmentally benign wood treatment systems because of the environmental concerns. Tall oil is a by-product from pulp and paper industry, contains resin and fatty acids, and is biodegradable. Tall oil treated wood can provide some reduction in water uptake and increase in decay resistance. In this research crude tall oil was dissolved in ethanol at 5, 10 and 15 % concentrations in the treatment of Scots pine according to full cell process. Dyestuff, iron oxide and sodium ascorbate were used an additive as 0,5 %. Weathering performance of tall oil and tall oil combined with additives were investigated in accelerated weathering chamber by application of ultraviolet irradiation and water spray. It is taken for granted that increasing concentration results in higher weight percent gain in treated samples. The best results were obtained with 10 % tall oil and iron oxide which indicated minimum total color changes. Colour measurements and visual examination revealed that iron oxide was the most effective additive in reducing weathering effect and lowering the total colour change.

Highlights

Wood can be treated with preservatives to improve decay and water resistance, photodegradation and fire retardance when expose to adverse conditions
Most wood protection systems rely on a toxic mode of action against biological deterioration, but these preservatives are hampered with some potential environmental concerns (Rowell 2006)
Tall oil rosin, distilled tall oil, tall oil heads, and tall oil pitch are the refined products by fractional distillation of crude tall oil (CTO) (Ramanen 2014)

Summary

Introduction

Wood can be treated with preservatives to improve decay and water resistance, photodegradation and fire retardance when expose to adverse conditions. Most wood protection systems rely on a toxic mode of action against biological deterioration, but these preservatives are hampered with some potential environmental concerns (Rowell 2006). Tall oil is known an environmentally friendly, biodegradable, can reduce water uptake (Van Eckeveld et al 2001) and the growth of fungi in wood (Paajanen and Ritschkoff 2002). It is obtained as a by-product from softwoods according to kraft process in the production of pulp. To production of purified crude tall oil (CTO) in the sulphate pulping process, tall oil soap is separated from the pulping liquor. Tall oil rosin, distilled tall oil, tall oil heads, and tall oil pitch are the refined products by fractional distillation of CTO (Ramanen 2014)

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