اصلاح چسب اوره فرم ‏آلدهید با فورفورال برای کاهش انتشار فرم‏ آلدهید از تخته ‏خرده‏ چوب

نوع مقاله : مقاله پژوهشی

نویسندگان

1 کارشناس ارشد صنایع چوب و کاغذ، دانشکده منابع طبیعی، دانشگاه تهران،کرج، ایران

2 استاد گروه علوم و صنایع چوب و کاغذ، دانشکدة منابع طبیعی، دانشگاه تهران، کرج، ایران

3 استادیار گروه علوم و صنایع چوب و کاغذ، دانشکدة ‏منابع طبیعی، دانشگاه تهران، کرج، ایران

4 استاد دانشکده علوم، دانشگاه پیام نور تهران، تهران، ایران

5 استاد گروه علوم و صنایع چوب و کاغذ، دانشکده منابع طبیعی، دانشگاه تهران، کرج، ایران

چکیده

در این مطالعه اثر جایگزینی بخشی از فرم‏آلدهید با فورفورال در چسب اوره فرم‌آلدهید بر انتشار فرم‌آلدهید و خواص فیزیکی و مکانیکی تخته خرده‌ چوب بررسی شد. خواص مکانیکی شامل مدول‌ گسیختگی (MOR)، مدول الاستیسیته (MOE)، و چسبندگی داخلی (IB)، و خواص فیزیکی شامل جذب آب (WA)، واکشیدگی ضخامت (TS)، و انتشار فرم ‏آلدهید و همچنین گروه‏ها و پیوندهای موجود در چسب‏های سنتزشده توسط طیف مادون قرمز (FTIR) تعیین و اندازه‏ گیری شدند. نتایج نشان دادند جایگزینی بخشی از فرم ‏آلدهید با فورفورال در چسب اوره فرم ‏آلدهید، انتشار فرم ‏آلدهید، مدول‌ گسیختگی، و مدول الاستیسیته تخته ‏ها را کاهش می‏دهد. تخته‏ های ساخته‌شده با چسب اصلاح‌شده در سطح 50 درصد فورفورال بالاترین چسبندگی داخلی را داشتند. جذب آب تخته ‏ها بعد از 2 و 24 ساعت غوطه‏وری بر خلاف واکشیدگی ضخامت با اصلاح چسب‏ها کاهش یافت. کمترین میزان واکشیدگی ضخامت در تخته ‏های ساخته‌شده با چسب اوره فرم‏آلدهید صنعتی مشاهده شد. می‏توان بهترین تیمار و شرایط ساخت تخته‏ ها را از نظر MOR و MOE و پایداری ابعاد، استفاده از چسب اوره فرم ‏آلدهید (بدون در نظر گرفتن انتشار فرم‏ آلدهید)، و از نظر IB و جذب آب، استفاده از چسب اصلاح‌شده با 50 درصد فورفورال معرفی کرد. کمترین میزان انتشار فرم ‏آلدهید را تخته ‏های ساخته‌شده با چسب اوره فرم ‏آلدهید آزمایشگاهی داشتند.

کلیدواژه‌ها

عنوان مقاله [English]

Modification of Urea- Formaldehyde Resin with Furfural in Particleboard for Reduction of Formaldehyde Emission

نویسندگان [English]

  • Robab Ghafari 1
  • Kazem Doosthoseyni 2
  • Ali Abdolkhani 3
  • Seyed Ahmad Mirshokraie 4
  • Mohamad Mahdi Faezipor 5
1 M.Sc., Department of Wood and Paper Science and Technology, Faculty of Natural Resources, University of Tehran, Karaj, I. R. Iran
2 Professor, Department of Wood and Paper Science and Technology, Faculty of Natural Resources, University of Tehran, Karaj, I. R. Iran
3 Associate Professor, Department of Wood and Paper Science and Technology, Faculty of Natural Resources, University of Tehran, Karaj, I. R. Irann
4 Professor, Departmentof Chemistry, Payame Noor University, Tehran I.R., Iran
5 Professor, Department of Wood and Paper Science and Technology, Faculty of Natural Resources, University of Tehran, Karaj, I. R. Iran
چکیده [English]

Partial replacement of formaldehyde with furfural in the urea-formaldehyde resin on the formaldehyde
emission, physical and mechanical properties of particleboard was investigated. The modulus of
rupture (MOR), modulus of elasticity (MOE), internal bond (IB), water absorption (WA), thickness
swelling (TS) and formaldehyde emission (FE) of Poplar particleboards made with the modified
resins were measured and were compared with the conventional UF resin. Also, chemical structures of
the synthesized Resins were characterized by Fourier Transform Infrared Spectroscopy (FTIR). The
results indicated that modulus of rupture (MOR), modulus of elasticity (MOE) and formaldehyde
emission (FE) from boards was decreased by partial replacement of formaldehyde. Boards prepared
with modified resin with 50% furfural showed the highest internal bond (IB). Two and 24 hours water
uptake test of the boards prepared with modified resin unlike thickness swelling was decreased
compared to the conventional resin. Boards prepared with industrial urea-formaldehyde resin
presented the least thickness swelling. Best treatment and condition of preparing boards in terms of
MOR, MOE and stableness of dimensions, it can be introduced using urea-formaldehyde resin (except
formaldehyde emission), also in terms of IB and water absorption, using resin modified with 50%
furfural. Boards cured with conventional UF resin presented the least formaldehyde emission.

کلیدواژه‌ها [English]

  • formaldehyde emission
  • Furfural
  • Modulus of elasticity
  • modulus of rupture
  • Urea formaldehyde resin

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