بهینه‌سازی روشنی و مقاومت‌های مکانیکی خمیرکاغذ جوهرزدایی‌شدۀ تیشو با استفاده از پلیمرهای طبیعی پروتئین سویا ایزوله و کیتوزان با روش سطح پاسخ

نوع مقاله : مقاله پژوهشی

نویسندگان

1 فارغ‌التحصیل کارشناسی ارشد، گروه علوم و صنایع چوب و کاغذ، دانشکدة منابع طبیعی دانشگاه تهران، کرج، ایران

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

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

4 استادیار، گروه مهندسی پالایش زیستی، دانشکدۀ مهندسی فناوری‌های نوین، دانشگاه شهید بهشتی، پردیس زیرآب، سوادکوه، ایران

چکیده

مقاومت­های مکانیکی کمتر کاغذ بازیافتی به­واسطة ماهیت الیاف به‌کاررفته در تولید آنهاست. برای جبران کاهش مقاومت‌های کاغذ بازیافتی حاصل از الیاف بازیافتی و بهبود آنها از پلیمرهای مختلفی مانند نشاستة کاتیونی استفاده می­شود. امروزه تمایل جهانی، استفاده از مواد طبیعی و تجدیدپذیر است. در این تحقیق، از دو پلیمر نوع طبیعی شامل کیتوزان و پروتئین سویا به­همراه گلوتارآلدهید به‌عنوان پیوند‌دهندة عرضی برای بهینه­سازی خواص مقاومتی کاغذهای تیشو حاصل از الیاف جوهرزدایی‌شده استفاده شد. هنگام تهیۀ کاغذهای دست­ساز، به­ترتیب محلول­های کیتوزان به مقدار 0 تا 2 درصد، سپس گلوتارآلدهید به مقدار 2 تا 6 درصد و در نهایت پروتئین سویا به مقدار 1 تا 3 درصد برحسب وزن خشک کاغذ به سوسپانسیون خمیرکاغذ اضافه شد. پس از ساخت کاغذها، خواص آنها با روش‌های استاندارد اندازه­گیری و نتایج با استفاده از نرم­افزار Design Expert.10 و روش سطح پاسخ (RSM) مدل­سازی شد. نتایج و مدل­های حاصل از نرم­افزار نشان داد که این مواد، اثرهای مستقل و متقابل دارند و با افزودن آنها درجۀ روشنی کاغذ دست­ساز نسبت به نمونۀ شاهد تفاوت معنی‌داری می‌یابد. افزودن محلول کیتوزان، پروتئین سویا و گلوتارآلدهید سبب افزایش شاخص مقاومت کششی خشک و تر و شاخص مقاومت به پارگی شد (در حالت بهینه به­ترتیب افزایش 145، 35 و 70 درصدی نسبت به نمونۀ شاهد) که این افزایش مقاومت­ها در مقایسه با افزودنی­های رایج مانند نشاستة کاتیونی بیشتر بود.

کلیدواژه‌ها


عنوان مقاله [English]

Optimizing the brightness and mechanical strength of tissue paper made of deinked pulp using isolated soy protein and chitosan by using response surface methodology

نویسندگان [English]

  • Seyed Sajad Sazmand 1
  • Yahya Hamzeh 2
  • Sahab Hedjazi 3
  • Hamid Reza Rudi 4
1 MSc. Graduated, Department of Wood and Paper Sciences and Technology, Faculty of Natural Resources, University of Tehran, Shahid Chamran Blvd., 31585-4314, Karaj, I.R. Iran.
2 Prof., Department of Wood and Paper Sciences and Technology, Faculty of Natural Resources, University of Tehran, Shahid Chamran Blvd., 31585-4314, Karaj, I.R. Iran.
3 Assoc., Prof., Department of Wood and Paper Sciences and Technology, Faculty of Natural Resources, University of Tehran, Shahid Chamran Blvd., 31585-4314, Karaj, I.R. Iran.
4 Assist., Prof., New Technologies Faculty, Shahid Beheshti University, Zirab Science and Technology Campus, Savadkoh, Mazandaran Province, I.R. Iran.
چکیده [English]

The lower mechanical properties of paper made from recycled fiber is due to their inherent properties of the used fibers. In order to improve strengths, various polymers such as cationic polymer are used, while today the global trend is the utilization of natural and renewable materials. In this study, two biopolymers including chitosan (Ch), isolated soy protein (ISP) along with glutaraldehyde (GA) were used to optimize the mechanical properties of the tissue paper made from the de-inked fibers. For this purpose, at the first chitosan solution with loading level of 0% to 2%, then glutaraldehyde with loading level of 2% to 6%, and finally isolated soy protein with 1% to 3% levels were added to the pulp suspension. The properties of handsheets were measured by standard test methods and the results were modeled using Design Expert.10 software and response surface method (RSM). The results and obtained models showed that addition of these additives did not make a significant difference on brightness of the hand sheet paper compared with the control sample. However, the addition of these additives increased the dry and wet tensile and tear strengths, which in the optimal addition level the increasing levels for mentioned properties were 145%, 35% and 70%, respectively, compared with the control sample. The increasing rate of tensile and tear resistance were higher than increasing rate obtained by conventional dry strength agents, such as cationic starch.

کلیدواژه‌ها [English]

  • Isolated soy protein
  • Recycled paper
  • Chitosan
  • glutaraldehyde
  • strengths properties
  • Optical properties
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