پژوهش های کاربردی مهندسی شیمی - پلیمر
فصلنامه علمی - پژوهشی

بررسی تأثیر نسبت NCO/OH، غلظت و نوع کاتالیست بر عمر کاربری سیستم بایندر بر پایه پلی‌بوتادین خاتمه‌یافته با هیدروکسیل

نوع مقاله : پژوهشی اصیل

نویسندگان

محسن آذرگون
عباس کبریت چی
موسی نظری

دانشگاه جامع امام حسین (ع)- دانشکده و پژوهشکده فنی و مهندسی- گروه مهندسی شیمی (مرکز علم و فناوری موسم)

چکیده
در این پژوهش اثر مقادیر مختلف دو نوع کاتالیست پخت رایج دی­بوتیل تین دی­لورات (DBTDL) و تری­فنیل بیسموت (TPB) و نسبت‌های مختلف NCO/OH (R) بر عمر کاربری و خواص فیزیکی سیستم بایندر پلی‌یورتانی بر پایه پلی­بوتادین خاتمه­یافته با هیدروکسیل (HTPB) مورد بررسی قرار گرفته است. با افزایش مقدار کاتالیست پخت برای هر دو نوع کاتالیست، سرعت افزایش ویسکوزیته سیستم بایندر بیش‌تر می‌گردد. همچنین با افزایش مقدار R از 8/0 تا ۱ سرعت افزایش ویسکوزیته و دانسیته اتصالات عرضی زیاد می‌شود. سیستم‌ بایندر برپایه ایزوفرون دی­ایزوسیانات (IPDI) دو مرحله مجزا افزایش ویسکوزیته با دو ثابت سرعت متفاوت را نشان می­دهد که این امر به حضور دو نوع گروه ایزوسیانات با واکنش‌پذیری‌های متفاوت در ساختار مولکولی این عامل پخت نسبت داده می‌شود. در ادامه خواص فیزیکی و تورم نمونه‌های بایندر مورد بررسی قرار گرفت. بر اساس این نتایج، بایندری که دارای بیش‌ترین دانسیته اتصالات عرضی است، دارای کم‌ترین میزان تورم هم می‌باشد. مقدار عمر کاربری از R 1 به 1/1، بر خلاف انتظار افزایش می­یابد. در هنگام استفاده از کاتالیست DBTDL، اثر تفاوت واکنش‌پذیری بین دو گروه ایزوسیانات IPDI به وضوح قابل تشخیص است ولی زمانی که از کاتالیست پخت TPB استفاده می­شود این تفاوت مشاهده نمی­شود.

کلیدواژه‌ها

عمر کاربری
کاتالیست‌پخت
مقدار R
ویسکوزیته
بایندر

موضوعات

عنوان مقاله English

Investigation the effect of NCO/OH ratio, amount and type of curing catayst on the Pot life of HTPB based binder system

نویسندگان English

Mohsen Azargoon
Abbas Kebritchi
Mosa Nazari
Imam Hossein Comprehensive University, Faculty of Engineering, Chemical Engineering Group
چکیده English

The pot life of high-energy composites is one of the most important parameters of their manufacturing process. This is mainly influenced by the pot life of the binder system. In this research, the effect of different amounts of two types of curing catalyst (dibutyltin dilaurate (DBTDL) and triphenyl bismuth (TPB)) and different ratios of NCO / OH (R) on the pot life and physical properties of the polyurethane binder system based on Hydroxyl-terminated polybutadiene (HTPB) was investigated. By increasing the amount of curing catalyst for both types of catalysts, the viscosity build-up of the binder system measured by the rotation viscometer was intensified. Also, increasing the amount of R from 0.8 to 1 increases the viscosity and crosslink density. Isophorone Diisocyanate (IPDI) binder system shows two distinct steps of increasing viscosity with two different rates, which is attributed to the presence of two different isocyanate groups in the molecular structure of IPDI with different reactivity. In the following, the physical properties and swelling of binder samples were investigated. Based on these results, binders with the highest crosslink density have the lowest swelling. The pot life value increases from R of 1 to 1.1, contrary to expectation, with pot life range value between R of 1 to 0.9. When using the DBTDL catalyst, it is clearly identifiable between different reactivity of two groups IPDI isocyanates, but when used with the TPB curing catalyst, this difference was not observed significantly.

کلیدواژه‌ها English

pot Life
Catalyst
R value
Viscosity
Binder
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