شناسایی ساز و کار چسبندگی پوشش های چوب و تکنیک های ارزیابی نفوذ پوشش

نوع مقاله : مقاله مروری

نویسندگان

1 استادیار، گروه علوم و صنایع چوب و کاغذ، دانشکده منابع طبیعی، دانشگاه تهران

2 دانشجوی دکتری، دانشکده منابع طبیعی، دانشگاه تهران

چکیده

در این مطالعه سازوکار نفوذ پوشش‌‌های مختلف به بافت چوب مورد بررسی قرار گرفته است. بر اساس نتایج پژوهش‌‌های انجام شده در زمینه بررسی‌‌های میکروسکوپی، میزان نفوذ پوشش به بافت چوب سوزنی‌‌برگان و پهن‌‌برگان متفاوت بوده است. در میان عوامل موثر بر میزان نفوذ، تاثیر ساختار آناتومی از اهمیت بالاتری نسبت به سایر عوامل برخوردار می‌‌باشد. در این مطالعه، ابتدا سلول‌‌های چوبی از دیدگاه آناتومی مورد بررسی قرار گرفت و سپس، سازوکار‌‌های نفوذ پوشش به بافت چوب بررسی شد. به طور کلی، شناخت ساختار آناتومی چوب و ویژگی های پوشش، کمک شایانی به بهبود روش‌های پوشش‌دهی چوب کرده است. نتایج نشان داد، آماده‌‌سازی سطح زیرین پوشش نظیر رنده‌‌کاری و سنباده‌‌زنی سبب ایجاد تغییرات نفوذ پوشش در بافت چوب می‌‌شود. همچنین، سنباده‌‌زنی باعث تغییر شکل سلول و مسدود‌شدن منافذ شده و یا حتی کاملا از نفوذ پوشش جلوگیری می‌‌کند. محل نفوذ پوشش در بافت چوب در داخل حفرات آوندی و منافذ می‌‌باشد. پوشش‌های پایه آب توانسته‌‌اند نفوذ بیشتری نسبت به پوشش‌‌های پایه حلال در چوب داشته باشند. به‌علاوه، وسایل چوبی دارای سطح زبر، جذب بیشتری از پوشش را دارد و باعث بهبود عملکرد در جذب مواد رنگی می‌‌شود.

کلیدواژه‌ها

dor 20.1001.1.22517278.1399.10.3.1.6

موضوعات


عنوان مقاله [English]

Identify the mechanism of Adhesion wood coatings and coating penetration assessment techniques

نویسندگان [English]

  • Hadi Gholamiyan 1
  • behnam gholampoor 2
1 Department of Wood and Paper Science & Technology, Faculty of Natural Resources, University of Tehran
2 Department of Wood and Paper Science & Technology, Faculty of Natural Resources, University of Tehran
چکیده [English]

In this study, the mechanism of penetration of various coatings on wood texture was investigated. Based on the results of microscopic studies, the penetration of the coating into the texture of soft and hard wood has been different. Among the factors affecting the penetration rate, the effect of anatomical structure is more important than other factors. In this study, wood cells were examined from an anatomical point of view and then, the mechanisms of coating penetration into wood tissue were investigated.In general, understanding the anatomical structure of wood and the characteristics of the coating has greatly contributed to the improvement of wood coating methods.The results showed that the preparation of the substrate surface such as grating and sanding causes changes in the penetration of the coating in the wood texture.Also, sanding causes the cell to deform and clog pores, or even completely prevent the coating from penetrating.The coating penetrates the wood tissue inside the vessel, wood rays and punctuation. Water-based coatings have been able to have more penetration than solvent-based coatings in wood. In addition, wood with a rough surface absorbs more of the coating and improves performance in absorbing pigments.

کلیدواژه‌ها [English]

  • surface energy
  • Adhesion
  • Permeability
  • Viscosity
  • microscope
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