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Fungal resistance of plywood produced from beech veneers treated with N-methylol melamine compounds and alkyl ketene dimer

Rotary cut Beech (Fagus sylvatica. L) veneers with dimension of 1.5 × 400 × 400 mm3 (rad × tang × long) were impregnated with three chemicals: N-methylol melamine (NMM-1 - 10% solid content), fatty acid modified N-methylol melamine/paraffin compound (mNMM-2 - 5% solid content), alkyl ketene dimer (AKD - 1% solid content). | 8 FUNGAL RESISTANCE OF PLYWOOD PRODUCED FROM BEECH VENEERS TREATED WITH N-METHYLOL MELAMINE COMPOUNDS AND ALKYL KETENE DIMER Trinh Hien Mai1, Tang Thi Kim Hong2 1 Vietnam National University of Forestry 2 Nong Lam University, Ho Chi Minh city Email: maith@vfu.edu.vn ABSTRACT Rotary cut Beech (Fagus sylvatica. L) veneers with dimension of 1.5 × 400 × 400 mm3 (rad × tang × long) were impregnated with three chemicals: N-methylol melamine (NMM-1 - 10% solid content), fatty acid modified N-methylol melamine/paraffin compound (mNMM-2 - 5% solid content), alkyl ketene dimer (AKD - 1% solid content). The impregnated veneers were pre-dried in a drying-oven at 40°C, 24 h to a moisture content of 3-8% before glue spreading. An amount of 160 g m-2 PF glue was applied per veneer. Afterwards, 5-layer-plywood was produced in a hot press (130°C) at 1.5 MPa (10 min pressing time). The resistance against white rot fungus (Pleurotus ostreatus) and brown rot fungus (Coniophora puteana) of the plywood was performed according to the ENV 12038. The plywood treated with 10% solid content of NMM-1 solution disclosed high protection to the brown rot fungus C. puteana and the white rot fungus P. ostreatus. While the treatment of veneers with 5% mNMM-2 and catalyst RB (an aluminium salt) imparted medium resistance to plywood against P. ostreatus and no resistance to C. puteana. The veneer treatment with 1% solid content of AKD totally failed to protect plywood from the brown rot fungus C. puteana and the white rot fungus P. ostreatus after 16 weeks of incubation. Keywords: alkyl ketene dimer, beech veneer, fungal resistance, N-methylol melamine. TÓM TẮT Ván mỏng bóc từ gỗ Dẻ gai (Fagus sylvatica. L) với kích thước 1,5 × 400 × 400 mm3 (XT × TT × DT) được ngâm tẩm với 3 loại hóa chất: N-methylol melamine (NMM-1-sử dụng ở hàm lượng rắn 10%), fatty acid modified N-methylol melamine/paraffin (mNMM-2-sử dụng ở hàm lượng rắn 5%), alkyl ketene dimer (AKD - sử dụng ở hàm lượng rắn 1%). Ván mỏng