توسعۀ مقاومت‌های خمیرکاغذ کرافت صنوبر با نانوفیبر ‌سلولزی تهیه‌شده از ساقۀ برنج

نوع مقاله: مقاله پژوهشی

نویسندگان

1 کارشناس ارشد دانشگاه تهران

2 دانشیار دانشگاه تهران

3 دانشیار موسسه تحقیقات جنگل ها و مراتع کشور

چکیده

این تحقیق با هدف توسعۀ مقاومت‌های خمیرکاغذ کرافت­لاینر با نانوفیبر سلولزی تهیه‌شده از ساقۀ برنج انجام گرفت. در این تحقیق، چوب صنوبر دلتوئیدس (P. deltoides) رقم 55-69 به­عنوان گونه‌ای موفق، تندرشد و زودبازده برای تولید خمیرکاغذ انتخاب شد. عوامل متغیر پخت کرافت شامل سولفیدیته، قلیا، درجۀ حرارت و مدت زمان، هر کدام در سه سطح و نسبت مایع پخت به مادۀ چوبی 4 به 1 در نظر گرفته شد. پخت بهینه براساس عدد کاپای 2/17 و بازده 94/53 درصد خمیرکاغذ با شرایط زیر شامل سولفیدیتۀ 23 درصد، قلیای فعال 18 درصد، زمان 180 دقیقه و دمای 170 درجۀ سانتی­گراد انتخاب شد. سپس این خمیرکاغذ برای دستیابی به درجۀ روانی 333 میلی‌لیتر درجۀ کانادایی پالایش شد و از آن کاغذهای دست­ساز با جرم پایۀ 60 گرم بر سانتی­متر مربع ساخته شد. افزودن نانوفیبر با سوسپانسیون خمیرکاغذ در سه سطح 5، 10 و 15 درصد براساس وزن خشک خمیرکاغذ انجام گرفت و در مدت زمان 5 دقیقه هم‌زده شد، سپس از خمیرهای تیمارشده، کاغذهای دست­ساز با جرم پایۀ مذکور تهیه شد. نتایج نشان داد که همۀ مقاومت­های کاغذ کرافت با افزایش مصرف نانوفیبرسلولزی افزایش یافت. با افزودن 15 درصد نانوفیبر سلولزی به سوسپانسیون خمیرکاغذ، شاخص کشش 31/26 درصد، شاخص ترکیدن 08/20 درصد، شاخص پارگی 07/10 درصد، مقدار سفتی ­خمشی 48/24 درصد و مقاومت به لهیدگی حلقوی 38/52 درصد افزایش یافت. نتایج کلی، حاکی از تأثیر مثبت افزودن نانوفیبر سلولزی به خمیرکاغذ کرافت صنوبر دلتوئیدس، در بهبود مقاومت­های کاغذ کرافت­لاینر است.

کلیدواژه‌ها


عنوان مقاله [English]

Development of poplar Kraft pulp strengths with cellulose nano fiber of rice straw

نویسندگان [English]

  • Saleh Ghahramani 1
  • Sahab Hedjazi 2
  • Saeed Mahdani 3
چکیده [English]

This study was carried out to make cellulose nanofiber reinforced Kraft liner paper from rice straw. In this regard, P.deltoides clone 69-55 as a fast growth and high yield biomass species was selected for pulp production. Variable factors of Kraft pulping process including sulfidity, active alkali, temperature and time were applied in three levels and liquor to wood ratio of 4:1. Optimum conditions of Kraft cooking were found as 23% sulfidity, 18% active alkali, 170 °C, and 180 min. cooking temperature and time, respectively. The pulping yield and kappa number of control pulp were measured as 53.94% and 17.2, respectively. Then, the pulp was refined to achieve freeness degree of 333 ml.CSF. Nano-cellulose fiber of rice straw was added to improve the strength of control kraft pulp. The nanofibers at 5, 10 and 15% loadings were mixed with pulp suspension and 60 g/m2 handsheets were manufactured by means of a laboratory handsheet maker. It was found that all the strength characteristics of prepared papers were improved by addition of nanofibers in different levels. Tensile, burst, and tear indices increased up to 26.31%, 20.08%, and 10.07%, respectively by addition of 15% cellulose nanofibers to the control pulp suspension. Moreover, bending stiffness and RCT improved to 24.48%, and 52.38%, respectively. The overall results indicated that incorporation of cellulose nanofibers had a positive effect on kraft liner pulp produced from P.deltoides.

کلیدواژه‌ها [English]

  • Kraft pulp
  • deltoeidos poplar
  • kraft liner
  • paper strength
  • cellulose nano fiber
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