پتانسیل ترکیب پلی‌آکریلات- سیلیکات سدیم در بهبود مقاومت به هوازدگی چوب پلیمر

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشیار، دانشگاه تربیت مدرس، دانشکدۀ منابع طبیعی، گروه علوم و صنایع چوب و کاغذ، ایران

2 دانشجوی کارشناسی ارشد، دانشگاه تربیت مدرس، دانشکدۀ منابع طبیعی، گروه علوم و صنایع چوب و کاغذ، ایران

چکیده

چکیده
این پژوهش با هدف تهیه نوعی چندسازه چوب-پلیمر از گونه چوب نراد با ترکیب‌هایی از سدیم سیلیکات و پلی‌آکریلات ساخته شد تا تأثیر آن بر بهبود آبشویی سدیم سیلیکات و مقاومت به تخریب ناشی از هوازدگی مورد بررسی قرار گیرد. برای این منظور، ابتدا نمونه‌های آزمونی، براساس استانداردهای مورد نظر تهیه شدند. سپس با استفاده از یک دستگاه سیلندر اشباع ، ابتدا تحت خلأ 5/0 بار به مدت 30 دقیقه و سپس فشار 6 بار به مدت 3 ساعت در حالت غوطه‌وری در درون سدیم سیلیکات و پلی‌آکریلات اشباع شدند. برای بررسی تأثیر این تیمارها بر میزان آبشویی سدیم سیلیکات از چوب و مقاومت در برابر هوازدگی ، نمونه‌های به مدت 80 روز در برابر هوازدگی هوازدگی طبیعی قرار داده شدند تا تغییرات ویژگی‌های آن مورد بررسی و مطالعه قرار گیرند. یافته‌ها نشان دادند که بودن پلی‌آکریلات پتانسیل بالایی را در کاهش آبشویی سدیم سلیکات داشته است. هم چنین پلی‌آکریلات سبب کاهش تغییرات رنگ و زبری سطح نمونه‌ها ناشی از تخریب در برابر هوازدگی طبیعی می‌گردد و این امر موجب افزایش آبگریزی و کاهش خاصیت تر شوندگی سطح نمونه‌ها در طی هوازدگی طبیعی شده است. از بین تیمارهای ترکیبی بررسی شده، تیمار S60- Pa50 - (1:2)، به دلیل بالاتر بودن میزان پلی‌آکریلات، بهترین عملکرد را نسبت به تیمار‌های دیگر در برابر هوازدگی طبیعی و کاهش آبشویی سدیم سیلیکات از خود نشان داد و به عنوان بهترین گزینه انتخاب شد.

کلیدواژه‌ها

عنوان مقاله [English]

Potential roles of polyacrylate- silicate sodium compound on weathering performance of a wood polymer composite

نویسندگان [English]

  • Behbood Mohebby 1
  • Marzieh Hajialiyan 2
1 Assoc., Prof., Tarbiat Modares University, Faculty of Natural Resources, Wood and Paper Science and Technology Department, I.R. Iran
2 MSc, Wood and Paper Science and Technology Department, Natural Resources Faculty, Tarbiat Modares University, Noor, Mazandaran, I.R. Iran
چکیده [English]

The aim of the current research work was to prepare a kind of the wood-polymer composite from fir wood with a combination of sodium silicate and polyacrylate compound and also to study their effects on prohibition in leaching of the sodium silicate and also increase in resistance of wood against the weathering. For this purpose, the test samples were initially prepared according to the standard methods. Afterwards, the specimens were impregnated with the sodium silicate and the polyacrylate under a vacuum of 0.5 bar for 30 minutes and then a pressure of 6 bar for 3 hours in a cylinder. The samples were then exposed to the natural weathering for 80 days period to study their weathering resistances, changes in color coordinates, roughness and also wettability of the treated wood as well as leaching of the impregnation compounds. The results showed that the presence of the polyacrylate had a higher potential performance to reduce leaching of the sodium silicate from wood. The polyacrylate also reduced the color changes and surface roughness of the samples due to the degradation during the weathering period. It was also revealed that the polyacrylate increased the hydrophobicity of the samples and reduced the wettability of the surface of the samples against the water droplets during the natural weathering. Among those treatments, the treatment S60- Pa50 - (1: 2) indicated the best performances compared to other treatments against the natural weathering and prohibition in leaching of the sodium silicate from the treated wood due to the higher amount of polyacrylate.

کلیدواژه‌ها [English]

  • Leaching
  • polyacrylate
  • wood polymer composites
  • sodium silicate
  • fir wood
  • natural weathering

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نشریه جنگل و فرآورده های چوب
دوره 75، شماره 2
شهریور 1401
صفحه 185-199

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