تاثیر پارامترهای واکنش در سنتز رزین فنل فرمالدئید و ارزیابی خواص محصول

سلطان الکتابی, فریبا; نیرومند, حمید

تاثیر پارامترهای واکنش در سنتز رزین فنل فرمالدئید و ارزیابی خواص محصول

نوع مقاله : پژوهشی اصیل

نویسندگان

فریبا سلطان الکتابی ¹

حمید نیرومند ²

¹ گروه فنی مهندسی، واحد شهرضا، دانشگاه آزاد اسلامی، شهرضا، ایران.

² ﮔﺮوه ﻓﻨﻰ ﻣﻬﻨﺪﺳﻰ، واﺣﺪ ﺷﻬﺮﺿﺎ، داﻧﺸﮕﺎه آزاد اﺳﻼﻣﻰ، ﺷﻬﺮﺿﺎ، ایﺮان.

چکیده

موضوع تحقیق: در ایﻦ ﭘﮋوﻫﺶ روش ﺳﻨﺘﺰ رزیﻦ ﻓﻨﻮل ﻓﺮﻣﺎﻟﺪﻫﯿﺪ که می‌تواند در صنعت چوب و نئوپان کاربرد داشته باشد ﻣﻮرد ﺑﺮرﺳﻰ ﻗﺮار ﮔﺮﻓﺘﻪ اﺳﺖ. این رزین به دو صورت نوولاک و رزول تهیه می شود که با تغییر شرایط واکنش محصولات متفاوتی تشکیل می شوند. رزول به عنوان چسب مایع در صنعت چوب و نئوپان استفاده می شود.

روش تحقیق: عوامل ﻣﺨﺘﻠﻔﻰ ﻣﺎﻧﻨﺪ ﻧﺴﺒﺖ ﻣﻮﻟﻰ ﻓﺮﻣﺎﻟﺪﻫﯿﺪ ﺑﻪ ﻓﻨﻮل،pH محیط واﮐﻨﺶ، دﻣﺎ و زﻣﺎن واﮐﻨﺶ و مقدار خروج آب حاصل از واکنش در سنتز رزین رزول و خواص محصول نهایی موثر می‌باشند. سنتز این ماده در شرایط واکنشی با نسبت مولی ﻓﺮﻣﺎﻟﺪﻫﯿﺪ ﺑﻪ ﻓﻨﻮل از 1/84 تا 2/50،pH محیط واﮐﻨﺶ از 4/0 تا 10/85، دمای واکنش از 80 تا C^◦ 100، زمان واکنش از 0/5 تا 4 ساعت و مقدار آب حاصل خروجی بر حسب عدد بدون بعد دی هیدراتاسیون 0/18 تا 1/02 انجام شد.

نتایج اصلی: نتایج نشان دادند که بیشترین زمان پایداری محصول به مدت 18 روز با نسبت مولی 2، محیط قلیایی در pH 9 تا 10، دمای90 تا C^◦ 95 و زمان واکنش2 ساعت به دست آمد. علاوه بر این گرانروی، چگالی، زمان ژلینگی و درصد جامدات در محصول به ترتیب cP 180،g/cm³ 1/224،S 30 و 51/20% حاصل شدند. با افزودن دی اتیلن گلایکول و اوره خواص محصول بهینه شد. با افزودن 8% دی اتیلن گلایکول زمان پایداری به 105 روز افزایش یافت و با افزودن 4% اوره میزان فرمالدهید آزاد در محصول به 1/29%کاهش یافت. با توجه به خواص محصول تولید شده می توان برای تولید انبوه رزین از شرایط واکنش به دست آمده استفاده نمود.

کلیدواژه‌ها

ﺳﻨﺘﺰ رزول

شرایط واکنش

ﻧﺴﺒﺖ ﻣﻮﻟﻰ ﻓﺮﻣﺎﻟﺪﻫﯿﺪ ﺑﻪ ﻓﻨﻮل

ﭘﺎیﺪاری

زمان ژلینگی

موضوعات

مهندسی پلیمریزاسیون

عنوان مقاله English

The effect of reaction parameters in phenol formaldehyde resin synthesis and the evaluation of product properties

نویسندگان English

Fariba Soltanolkottabi ¹

Hamid Niroomand ²

¹ Department of Chemical Engineering, Shahreza Branch, Islamic Azad University, Shahreza, Iran.

² Department of Chemical Engineering, Shahreza Branch, Islamic Azad University, Shahreza, Iran.

چکیده English

Abstract

Research subject: In this research, the synthesis method of phenol-formaldehyde resin has been investigated, which can be used in the wood and chipboard industry. This resin is prepared in two forms, Novolac and Resole, which different products are formed by changing the reaction conditions. Resole is used as a liquid adhesive in the wood and chipboard industry.

Research approach: Various parameters are effective in the synthesis of the resin and the properties of the final product such as the molar ratio of formaldehyde to phenol, the pH of the reaction medium, the temperature and time of the reaction, and the amount of water released from the reaction. The synthesis of this material was carried out under reaction conditions with the molar ratio of formaldehyde to phenol from 1.84 to 2.50, the reaction medium pH from 4.0 to 10.85, the reaction temperature from 80 to 100 ^◦C, the reaction time from 0.5 to 4 h, and the water output amount in the term of dehydration dimensionless number from 0.18 to 1.02.

Main results: The results showed that the maximum product stability time was obtained for 18 days at the molar ratio of 2, the alkaline medium at pH 9 to 10, the reaction temperature at 90 to 95 ^◦C, and reaction time at 2 h. Moreover, viscosity, density, gelation time, and percentage of solids were obtained 180 cP, 1.224 g/cm³, 30 S, and 51.20%, respectively. Product properties were optimized by adding diethylene glycol and urea. The stability time increased to 105 days by adding 8% diethylene glycol and the free formaldehyde amount in the product decreased to 1.29% by adding 4% urea. According to the properties of the created product, the obtained reaction conditions can be used for the mass production of the resin.

کلیدواژه‌ها English

Synthesis of resole

Reaction conditions

Molar ratio of formaldehyde to phenol

Stability

Gelation time

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