Wood Modification and Wood Preservation
َAmir Mohamad Nahofteh Estarabadi; Davood Rasouli; Taghi Tabarsa; Abolghasem Khazaeian
Abstract
Background and Objectives: Wood, as an organic material, is susceptible to deterioration by destructive factors such as fungi and insects. One approach to protect against these factors is the treatment of wood with preservatives. The use of waterborne preservatives is common due to the numerous advantages. ...
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Background and Objectives: Wood, as an organic material, is susceptible to deterioration by destructive factors such as fungi and insects. One approach to protect against these factors is the treatment of wood with preservatives. The use of waterborne preservatives is common due to the numerous advantages. However, when preservative-treated wood is exposed to outdoor environments, it becomes susceptible to weathering and leaching. The use of coatings can be an effective method in this regard. This research investigates the effectiveness of two transparent coatings, acrylic and alkyd, in enhancing the weathering resistance of wood specimens treated with waterborne preservatives. .Methodology: defect-free poplar wood specimens with dimensions of 12×10×2 cm3 (L, T, R) were prepared and then they were treated with preservatives ACC, CCB, and ACQ-C using the full-cell/pressure impregnation method. Subsequently, acrylic and alkyd transparent coatings were applied to the surface of the specimens. After applying the coatings, the specimens were exposed to natural weathering for one year.Results: The results indicated that the type of coating significantly influenced the color and adhesion resistance of specimens. Furthermore, the research findings demonstrated that all specimens experienced color changes and a decrease in coating adhesion resistance due to weathering. Among the coatings, the intensity of color changes and deterioration in specimens with acrylic coatings was higher compared to those with alkyd coatings. Conclusion: In general, it can be concluded that alkyd coatings exhibited better preservative performance against weathering for preservative-treated wood.Background and Objectives: Wood, as an organic material, is susceptible to deterioration by destructive factors such as fungi and insects. One approach to protect against these factors is the treatment of wood with preservatives. The use of waterborne preservatives is common due to the numerous advantages. However, when preservative-treated wood is exposed to outdoor environments, it becomes susceptible to weathering and leaching. The use of coatings can be an effective method in this regard. This research investigates the effectiveness of two transparent coatings, acrylic and alkyd, in enhancing the weathering resistance of wood specimens treated with waterborne preservatives. .Methodology: defect-free poplar wood specimens with dimensions of 12×10×2 cm3 (L, T, R) were prepared and then they were treated with preservatives ACC, CCB, and ACQ-C using the full-cell/pressure impregnation method. Subsequently, acrylic and alkyd transparent coatings were applied to the surface of the specimens. After applying the coatings, the specimens were exposed to natural weathering for one year. .Results: The results indicated that the type of coating significantly influenced the color and adhesion resistance of specimens. Furthermore, the research findings demonstrated that all specimens experienced color changes and a decrease in coating adhesion resistance due to weathering. Among the coatings, the intensity of color changes and deterioration in specimens with acrylic coatings was higher compared to those with alkyd coatings.Conclusion: In general, it can be concluded that alkyd coatings exhibited better preservative performance against weathering for preservative-treated wood. .Conclusion: In general, it can be concluded that alkyd coatings exhibited better preservative performance against weathering for preservative-treated wood. .
Abdolah Elyasy; Taghi Tabarsa; Hamidreza Mansouri; Alireza Shakeri
Abstract
Researches on antimicrobial coatings to protect surfaces from remnants of microorganisms on the surfaces in the environment that can lead to the spread of diseases in human societies, has attracted a remarkable interest. In this regard, the effects of chitosan nanofibers and clay nanoparticles (sodium ...
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Researches on antimicrobial coatings to protect surfaces from remnants of microorganisms on the surfaces in the environment that can lead to the spread of diseases in human societies, has attracted a remarkable interest. In this regard, the effects of chitosan nanofibers and clay nanoparticles (sodium montmorillonite) on antibacterial properties of melamine coatings were investigated. Urea formaldehyde and melamine formaldehyde resins were prepared by adding nanomaterials to each of them 1% by weight using a mechanical-ultrasound mixing method. The distribution and presence of nanomaterials in the resin and the antibacterial properties of melamine coatings were studied. To investigate the antibacterial properties of melamine coatings prepared, two type Gram-positive bacteria (Staphylococcus aureus) and Gram-negative bacteria (Escherichia coli) were used. The results of X-ray diffraction and field-emission electron microscopy images, confirmed the proper distribution of chitosan nanofibers and clay nanoparticles in the polymer. The results also showed that by adding nanomaterials to the resins used in the melamine coating, the antibacterial properties of the coatings can be remarkably improved. On the other hand, the study of antibacterial properties of coatings showed that chitosan nanofibers had stronger antibacterial properties than clay montmorillonite Na+ nanoparticles.
