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Biological resistance and application properties of particleboard containing nano zinc oxide

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Document pages: 8 pages

Abstract: It is recommended that special particleboard (PBS) used in kitchens, bathrooms, hospitals and other specific products used indoors should have sufficient resistance to bacteria, molds and rotting fungi. This work studied the effects of zinc oxide nanoparticles (nano ZnO) added to melamine urea formaldehyde (MUF) adhesive on the selected biological, moisture and strength properties of monolayer PBS produced in the laboratory. PBS treated with nano zinc oxide has higher biological resistance: (1) up to 70 against gram-positive Staphylococcus aureus and 50 against Gram-negative Escherichia coli, because their bacterial activity decreased from 0.38 – 0.40 to 0.12 – 0.19 when using 1.0 McFarland bacterial inoculum ×   108 CFU ml; (2)gainst the molds Penicillium brevicompactum and Aspergillus niger by up to ca. 50–63 , since their growth intensities (0–4) on the top surfaces of treated PBs decreased according to a modified EN 15457 from 2.33–2.67 by up to 1.17–1.0; (3) against the brown-rot fungus Coniophora puteana by up to 85.7 , since their weight losses reduced according to a modified ENV 12038 from 17.4 by up to 2.5 . The presence of nano-ZnO in PBs uninfluenced their swelling, water absorption, and bending strength; however, it decreased their internal bond strength by up to 38.8 .

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