بررسی روش‌های مختلف پلیمرشدن امولسیونی در تهیه لاتکس‌های پرجامد

نوع مقاله : تالیفی

نویسندگان

1 گروه مهندسی پلیمریزاسیون دانشکده فرایند پژوهشگاه پلیمر و پتروشیمی ایران تهران

2 هیئت علمی

چکیده

از چالش‌های مطرح در پلیمرشدن ­های امولسیونی طی دو دهه گذشته، چگونگی افزایش مقدار جامد لاتکس پلیمر بوده است. در مقایسه با لاتکس معمولی، لاتکس پرجامد (HSC)، کسر حجمی بزرگی از فاز پراکنده مونومر، حتی بیش از %70 وزنی دارد. افزایش غلظت پلیمر لاتکس، مزایای مهمی چون افزایش بازده فضا–زمانی واکنشگاه، کاهش زمان تشکیل فیلم و خشک­ شدن آن و همچنین کاهش هزینه ­های نگهداری و حمل­ و­ نقل لاتکس را به­ همراه دارد. پلیمرشدن­ های امولسیونی متداول، ریز­امولسیونی، خودامولسیون ­سازی و امولسیونی غلیظ ­شده همگی برای آماده‌­سازی لاتکس‌های HSC استفاده شده ­اند و نتایج خوبی در سال‌های اخیر از آن­ها گزارش شده ‌است. تولید لاتکس ­های HSC با روشی تکرارپذیر، مستلزم کنترل دقیق توزیع اندازه ذرات است. برای تهیه لاتکس با مقدار جامد بیش از %60 یا %70 وزنی، توزیع اندازه ذرات باید کاملا گسترده یا چندقله ­ای باشد. افزون بر این، گران­روی لاتکس HSC به ­شدت نسبت به توزیع اندازه ذرات حساس است. در این مطالعه، پیشرفت‌های چند سال گذشته را که به­ طور عمده در فرایندهای آماده‌سازی این­گونه لاتکس­ ها و کاربرد آن­ها بوده به ­طور اجمالی مرور می­ شوند.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Investigation of Different Emulsion Polymerization Methods for Preparing High Solid Content Latexes

نویسنده [English]

  • Pedram Fasihi 1
1 polymerization processing engineering department,, polymer processing faculty, ,IPPI
2
چکیده [English]

One of the challenges in emulsion polymerization over the past two decades has been how to increase the solid content of polymer latex. Compared to conventional latex, high solid content latex (HSC) has a large volume fraction of the monomer dispersed phase, even more than 70% by weight. Increasing the concentration of polymer in latex, has important advantages such as increasing the space-time efficiency of the reactor, reducing the film formation and drying time, as well as reducing its storage and transportation costs. Conventional emulsion polymerization, mini-emulsion polymerization, self-emulsification polymerization, and concentrated emulsion polymerization have all been used to prepare HSC latexes, and good results have been reported in recent years. Production of HSC latexes in a reproducible manner requires precise control of the particle size distribution. To obtain a solid content above 60% or 70% by weight, the particle size distribution must be quite broad or multimodal. In addition, viscosity of HSC latex is highly sensitive to particle size distribution. In this study, the advances of the last few years, which are mainly in the preparation processes of such latexes and their applications are briefly reviewed.

کلیدواژه‌ها [English]

  • : emulsion polymerization
  • high solid content latex
  • preparation
  • particle size distribution
  • latex viscosity

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