عملکرد پوشش‌های شفاف در مقاومت به هوازدگی چوب های تیمار شده با مواد حفاظتی

سابقه و هدف: چوب بعنوان یک ماده‌ای آلی توسط عوامل مخربی همچون قارچ‌ها و حشرات دچار تخریب می گردد. یکی از راههای حفاظت در برابر این عوامل، تیمار چوب آلات با مواد حفاظتی می باشد. استفاده از مواد حفاظتی محلول در آب به دلیل مزایایی زیادی که دارد بسیار متداول می‌باشد. استفاده از چوب آلات تیمار شده با این مواد حفاظتی در محیط های بیرونی، آنها را در معرض آبشویی و هوازدگی قرار می دهد. استفاده از پوشش ها می‌تواند روشی کارآمد در این زمینه باشد. در این تحقیق، کارایی دو پوشش شفاف آکریلیکی و آلکیدی جهت افزایش مقاومت به هوازدگی نمونه‌های چوبی تیمار شده با مواد حفاظتی محلول در آب مورد بررسی قرار گرفته است. مواد و روش ها: در این تحقیق از نمونه‌های چوبی سالم و بدون عیب از چوب صنوبر دلتوئیدس با ابعاد 12×10×2 سانتی متر (l،t،r) تهیه و با مواد حفاظتی acc (اسید مس-کروم)، ccb (مس- کروم-برون) وacq-c (آلکالاین مش-کوات) به روش خلا/فشار اشباع شدند و در ادامه از رنگ ای شفاف آلکیدی و آکریلیکی برای پوشش دهی سطح نمونه‌ها استفاده شد .و در نهایت پس از اعمال رنگ بر روی آن ها به مدت یکسال در معرض هوازدگی طبیعی قرار داده شدند.یافته‌ها: نتایج نشان داد نوع پوشش تاثیر معنی‌داری بر رنگ و مقاومت به چسبندگی نمونه‌های تیمار شده با مواد حفاظتی داشته است. همچنین نتایج این تحقیق نشان داد که کلیه نمونه ها در اثر هوازدگی دچار تغییرات رنگی و کاهش مقاومت چسبندگی پوشش مورد استفاده شده‌اند که در این بین شدت تغییر رنگ و تخریب نمونه های دارای پوشش آکریلیکی بیشتر از نمونه های آلکیدی بوده استنتیجه گیری: به طور کلی می توان گفت رنگ آلکیدی عملکرد حفاطتی بهتری برای چوب های تیمار شده در برابر هوازدگی از خود نشان داد.

transparent coatings performance on weathering resistance of 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.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. .