تأثیر استفاده از لجن فعال، نشاستۀ کاتیونی و نانوکیتوزان بر ویژگی‌های فیزیکی و مقاومتی خمیرکاغذ بازیافتی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکتری صنایع چوب و کاغذ واحد چالوس، دانشگاه آزاد اسلامی، چالوس، ایران

2 دانشیار گروه صنایع چوب و کاغذ، واحد چالوس، دانشگاه آزاد اسلامی، چالوس، ایران

3 استادیار گروه صنایع چوب و کاغذ، واحد چالوس، دانشگاه آزاد اسلامی، چالوس، ایران

چکیده

این تحقیق با هدف بررسی تأثیر افزودن لجن فعال کارخانۀ کاغذسازی، نشاستۀ کاتیونی و نانو­کیتوزان بر ویژگی­های فیزیکی و مقاومتی خمیر­کاغذ بازیافتی انجام گرفت. به همین منظور، ابتدا لجن فعال در زمان 30 دقیقه با فورفورال 3 درصد پیش‌تیمار و سپس در حمام بن‌ماری با دمای 75 و 100 درجۀ سانتی­گراد و زمان­های 45 و 90 دقیقه‏ تیمار شد و با نسبت­­های مختلف با خمیر روزنامۀ باطله، مخلوط و پالایش شده و نشاستۀ کاتیونی 5/1 درصد و نانوکیتوزان 2 درصد به آن افزوده شد. نمونه­های آزمونی مطابق با استانداردTAPPI  با وزن پایۀ 120 گرم بر متر مربع تهیه و ویژگی‌های فیزیکی و مقاومتی آنها اندازه­گیری و مقایسه شد. نتایج نشان داد که با افزایش لجن فعال تیمارنشده به خمیرکاغذ بازیافتی، مقاومت به پارگی، مقاومت به حلقه شدن، مقاومت به ترکیدن و تعداد تا شدن کاهش و جذب آب افزایش یافت. با تیمار شیمیایی لجن فعال با فورفورال، افزایش محسوسی در مقاومت به پارگی، مقاومت به حلقه شدن، مقاومت به ترکیدن، مقاومت به تا شدن و کاهش مقاومت کششی و جذب آب مشاهده شد. با افزودن نشاستۀ کاتیونی و نانو­کیتوزان، افزایش چشمگیری در همۀ ویژگی­های مقاومتی و کاهش جذب آب نمونه­ها مشاهده شد. بررسی طیف FT-IR نمونه­های تیمارشده نشان داد که تیمار فورفورال موجب تقویت و فعال شدن گروه­های عاملی هیدروکسیل موجود در سطح الیاف لجن فعال‌شده می‌شود، به‌طوری ­که مناسب‌ترین ویژگی­ها در سطح 5 درصد لجن در دمای 100 درجۀ سانتی­گراد و زمان 90 دقیقه بوده است.

کلیدواژه‌ها

عنوان مقاله [English]

Effect of using activated sludge, cationic starch and nano-chitosan on physical and strength properties of old newspaper recycled pulp

نویسندگان [English]

  • Naghmeh Amani 1
  • Ramin Veysi 2
  • Majid Kiaei 2
  • Abdollah Najafi 2
  • Eshagh Ebadi 3
1 Ph.D. Student, Department of Wood Science and Paper Technology, Chalous Branch, Islamic Azad University, Chalous, I.R. Iran
2 Assoc., Prof., Department of Wood and Paper Engineering, Chaloos Branch, Islamic Azad University, Chaloos, I.R. Iran
3 Assist., Prof., Department of Wood and Paper Engineering, Chaloos Branch, Islamic Azad University, Chaloos, I.R. Iran
چکیده [English]

This study aimed to study the effect of using paper making activated sludge, cationic starch and nano-chitosan on physical and strength properties of old newspaper recycled pulp (ONP). For this purpose, the activated sludge was pre-treated for 30 min in 3% furfural and then treated with it in a water bath at 75 and 100 ° C for 45 and 90 min. Afterwards, it was mixed and refined with waste newsprint paper pulp at different mixing ratios. Finally, cationic starch 1.5% and nano-chitosan 2% were added. The test specimens were prepared from pulps with 120 gr/m2 basis weight according to TAPPI standard and the physical and strengths properties were measured and compared. The results showed that the strengths properties (tear, ring crush test, burst, folding strength) decreased and the physical properties (water absorption) increased with the increase of untreated sludge in ONP. Chemical treatment with furfural sludge showed a tangible increase in tear strength, ring crush test, burst strength and folding strength and a decrease in tensile strength and water absorption. Also, the addition of cationic starch and nano-chitosan significantly increased the strengths properties and decreased water absorption of the samples. FT-IR spectrum of the treated samples showed that treatment with furfural strengthen and activate the functional groups on the surface of sludge fibers.The most appropriate mixing ratio of sludge was at 5% level at 100° C, and 90 min.

کلیدواژه‌ها [English]

  • Furfural
  • newsprint paper
  • activated sludge
  • nano-chitosan
  • cationic starch

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نشریه جنگل و فرآورده های چوب
دوره 73، شماره 3
آبان 1399
صفحه 365-378

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