Leaching properties of wood treated with copper and boron compounds combined with water repellents

Abstract

In this study, leaching performances of ammonium copper quat (ACQ) and boric acid (BA) chemicals, which are highly used in wood protection industry, were studied. Micronized copper quat (MCQ) and Nano boron (NB) were used as reference materials to ACQ and BA preservatives. Scots pine (Pinus sylvestris L.) wood samples were impregnated according to the full cell method with ACQ at 2,4 % concentration, BA at 4% concentration and MCQ and NB at 1% concentration levels. ACQ and BA impregnated samples were then, impregnated for a second time using 5 different water-repellent materials (tall oil, linseed oil, sodium silicate, methyl hydrogen silicone, N'-N-(1, 8-Naphthalyl) hydroxylamine). Polyethylene glycol 600 and aluminium sulphate were administered in the form of single impregnation by making a homogeneous mixture with ACQ and BA. In variotions made using ACQ, BA and water repellent materials, all variations except ACQ+MHS were failed to prevent copper and boron leaching. In samples impregnated with ACQ+MHS, only 3 % copper leaching was obtained. In addition, the copper leaching in samples impregnated with ACQ were lower compared to copper leaching in samples impregnated with MCQ. It was found that samples impregnated with NB showed high resistance towards to leaching. According to the results of leaching test, the non-leached boron amount in samples impregnated with NB was 42.88 %.

Keywords

• alkaline copper quat (acq)
• boric acid (ba)
• micronized copper quat (mcq)
• nano boron (nb)
• leaching test
• alkali bakır kuat (acq)
• borik asit (ba)
• mikronize bakır kuat (mcq)
• nano bor (nb)
• yıkanma testi