Abstract
The objective of this work was to evaluate the efficiency of the industrial preservative treatment with Chromated Copper Borate (CCB) in different concentrations and pressure time in the autoclave through retention and penetration in Eucalyptus wood. Nine Eucalyptus trees were felled, debarking and cut into fence posts with a length of 2.20 meters and diameters ranging from 9.2 to 15.4 cm. The Eucalyptus fence posts were submitted to the industrial autoclave (Bethel method) in nine conditions, according to the CCB concentration and the pressure times: 1.5%, 2.0%, and 2.5% and 30, 60 and 90 minutes. The retention and penetration tests were performed. The application of 1.5% CCB concentration and 30 minutes of pressure in the autoclave provided penetration and retention according to the levels required for the application of the wood as fence posts in contact with the soil, and is the conditions indicated for the treatment E. urograndis wood preservative with CCB.
Highlights
Wood is a material of organic origin, and depending on the environmental conditions to which it is submitted it might be deteriorated by biological degradation agents, as well as by chemical reactions (LOPES et al, 2017)
The total retention of Chromated Copper Borate (CCB) for Urograndis wood submitted to autoclave preservative treatment as a function of pressure time was satisfactory for all conditions employed, with significant differences (Table 1)
The highest retention was observed in the condition that used the longest pressure time (60 and 90 minutes), the shortest time applied is sufficient according to ABNT NBR 9480 (ASSOCIAÇÃO BRASILEIRA DE NORMAS TÉCNICAS, 2009), which states the minimum retention should be 6.5 kg active ingredient per m3 to treated fence post in contact with soil
Summary
Wood is a material of organic origin, and depending on the environmental conditions to which it is submitted it might be deteriorated by biological degradation agents (bacteria, fungi, insects), as well as by chemical reactions (LOPES et al, 2017). Despite its low natural durability, Eucalyptus wood is the main source of raw material for the production of cellulose pulp, energy and solid products, as in the furniture industry and rural construction, such as fence posts (INDÚSTRIA BRASIELIRA DE ÁRVORES, 2018). For applications in their solid form, the treatment of Eucalyptus wood becomes a fundamental part, mainly in contact with soil or under conditions that favour the attack of xylophage agents, as it improves its resistance to deterioration. Industrial methods (with an autoclave and presence of pressure) are regarded as more environmentally safe and efficient compared to non-pressure methods because of the degree of control that industrial components provide during the wood treatment process
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