بررسی اثر تنش گرمایی بر ویژگی‌های سطحی پوشش‌های چوب

نوع مقاله : مقاله پژوهشی

نویسندگان

گروه علوم و صنایع چوب و کاغذ، دانشکده منابع طبیعی، دانشگاه تهران، کرج، ایران، صندوق پستی: 4111

چکیده

در این پژوهش به بررسی تاثیر استفاده از چرخه حرارتی بر تغییرات مقاومت به ضربه و سختی برخی پوشش­های مورد استفاده در صنعت چوب و مبلمان پرداخته شده است. از گونه چوب چنار و از سه نوع پوشش آکریلیک، پلی­یورتان و آلکیدی ساخت کارخانه ریف استفاده شد. همچنین از آزمون­های سختی خراشی، سختی سنج آونگی، ضربه و زبری جهت بررسی خواص سطحی نمونه­ها قبل و بعد از پوشش­دهی و تیمار حرارتی استفاده شد. نتایج نشان داد در میان پوشش­ها بیشترین میزان مقاومت در برابر سختی خراشی و سختی آونگی مربوط به پوشش آلکیدی بود. اما در نتایج آزمون ضربه و زبری سطح مشخص گردید که پوشش آکریلیکی دارای مقاومت بیشتری نسبت به سایر پوشش­های پلی­یورتان و آلکیدی می­باشد. در اثر تنش حرارتی میزان مقاومت­ها به طور کلی در تمامی پوشش­ها کاهش یافت و بهترین عملکرد مربوط به پوشش آکریلیکی بود. همچنین، نتایج تحلیل آماری نشان داد اختلاف معناداری میان پوشش‌های آکریلیکی و آلکیدی مشاهده می‌شود.

کلیدواژه‌ها

عنوان مقاله [English]

Investigation of the Effect of Heat Stress on the Surface Properties of Wood Coatings

نویسندگان [English]

  • Hadi Gholamiyan
  • Ahmad Javid
Department of Wood and Paper Science and Technology, Faculty of Natural Resources, University of Tehran, P. O. Box: 4111, Karaj, Iran
چکیده [English]

This study investigates the effects of the thermal cycles on changes in impact resistance and hardness of some coatings used in the wood and furniture industries. Platanus wood species and three types of acrylic, polyurethane, and alkyd coatings made by the Reef factory were used. Also, scratch hardness, pendulum hardness, impact, and roughness tests were used to evaluate the surface properties of the samples before and after coating and thermal stresses. The results showed that the highest resistance to scratch hardness and pendulum hardness among the coatings were related to alkyd coatings. However, in the impact and surface roughness tests, it was found that Acrylic coating has more resistance than other polyurethane and alkyd coatings. Due to thermal stresses, the resistance generally decreased in all coatings, and the best performance was obtained with Acrylic coating. Also, the statistical analysis results showed a significant difference between Acrylic and alkyd coatings.

کلیدواژه‌ها [English]

  • Plane Wood
  • Coating
  • Thermal stresses
  • Alkyd
  • Polyurethane
  • Acrylic

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