اصلاح اپوکسی توسط پلی یورتان و تاثیرات آن بر خواص سایشی و چسبندگی

بهرام نیا, حامد; محمدیان سمنانی, حمیدرضا; حبیب الله زاده, علی; عبدوس, حسن

اصلاح اپوکسی توسط پلی یورتان و تاثیرات آن بر خواص سایشی و چسبندگی

نوع مقاله : پژوهشی اصیل

نویسندگان

حامد بهرام نیا ¹

حمیدرضا محمدیان سمنانی ¹

علی حبیب الله زاده ¹

حسن عبدوس ²

¹ سمنان، دانشگاه سمنان، دانشکده مهندسی مواد و متالورژی

² سمنان، دانشگاه سمنان، پردیس علوم و فناوری های نوین، دانشکده نانو فناوری

چکیده

چکیده

هدف تحقیق: در این پژوهش، اصلاح اپوکسی توسط پلی یورتان بصورت موفقیت آمیز انجام شد و تاثیر آن بر خواص سایشی و چسبندگی مورد واکاوی قرار گرفت. مهمترین نگرانی در ترکیب این دو پلیمر، تشکیل ژل بهنگام مواجهه رزین اپوکسی و ایزوسیانات موجود در پلی یورتان بود.

روش تحقیق: یک راه حل برای غلبه بر این مشکل، کنترل فعالیت شیمیایی ایزوسیانات است. بنابراین به منظور کاهش فعالیت شیمیایی ایزوسیانات و جلوگیری از تشکیل ژل در اثر ترکیب اپوکسی و پلی یورتان، ابتدا پیش پلیمر پلی یورتان حاوی 58/3 درصد وزنی ایزوسیانات، با ترکیب پلی تترا متیلن گلایکول 2000 (PTMG 2000) و تولوئن دی ایزوسیانات (2,4-TDI)، تهیه و با اضافه کردن ۲۰ درصد وزنی از آن به رزین اپوکسی، فرآیند پخت با استفاده از دی متیل تیوتولوئن دی آمین (DMTDA)، بعنوان عامل پخت مشترک و‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍ همچنین عملیات حرارتی خاص، کامل شد.

اهم نتایج: نتایج طیف بینی تبدیل فوریه زیر قرمز نشان داد، فرآیند اصلاح با حذف پیک های مربوط به اپوکساید و ایزوسیانات در طیف مخصوص به نمونه تهیه شده، و همچنین ایجاد یک پیک پهن مربوط به گروه های هیدروکسیل ثانویه (C-O) در اثر باز شدن حلقه های اپوکساید، موفقیت آمیز بوده است. آزمون چسبندگی نیز، افزایش چسبندگی به زیرآیند فولاد کربنی، در نتیجه تولید هیدروکسیل ثانویه حین این آمیخته سازی را تائید کرد. اگرچه سختی پرسوز در اپوکسی اصلاح شده به میزان 5% کاهش یافت اما با کاهش 17 برابری مدول الاستیک (طبق نتیجه آزمون کشش)، مقاومت سایشی بر اساس آزمون سایش، 6 برابر بهبود یافت. سرانجام با در نظر گرفتن تصاویر میکروسکوپ الکترونی روبشی- نشر میدان مغناطیسی، بهم پیوستن حفرات، بعنوان سازوکار سایش معرفی شد.

کلیدواژه‌ها

آمیخته سازی

اپوکسی

پلی یورتان

سایش

چسبندگی

موضوعات

مهندسی پلیمریزاسیون

عنوان مقاله English

Epoxy Modification by Polyurethane and Its Effects on Abrasion and Adhesion Properties

نویسندگان English

Hamed Bahramnia ¹

Hamidreza Mohammadian Semnani ¹

ali habibolah zadeh ¹

Hassan Abdoos ²

¹ Semnan, Semnan University, Metallurgical and Materials engineering Department

² Semnan, Semnan University, Faculty of Science and New Technologies, Nano Technology Department

چکیده English

Abstract

Research subject: In this research, epoxy modification was successfully performed by polyurethane and its effect on abrasion and adhesion properties have been investigated. The most important concern in the blending of these polymers was the formation of gels upon exposure of epoxy resin and isocyanate in polyurethane.

Research approach: One solution to overcome this problem is to control the chemical activity of Isocyanate. Therefore to reduce the chemical activity of isocyanate and prevent gel formation due to the combination of epoxy and polyurethane, first polyurethane prepolymer containing 3.58 wt.% NCO was prepared by mixing poly tetra methylene glycol 2000 (PTMG 2000) and toluene di isocyanate (2,4-TDI); and then by adding 20 wt.% of it to the epoxy resin, the curing process was completed by using dimethyl thio-toluene di amine (DMTDA) as a common curing agent and also specific heat treatment.

Main results: Fourier transformation infrared spectroscopy results showed that the modification process has been successful by elimination of the peaks related to epoxide and isocyanate groups in the prepared sample in addition to the formation of a broad peak related to secondary hydroxyl group (C-O) due to the opening of epoxide rings. Pull off tests also confirmed increasing adhesion to carbon steel substrate as a result of secondary hydroxyl generation through this blending. Although, the Persoz hardness of modified epoxy decreased by 5%, but with a 17-fold reduction of elastic modulus (as per tensile test result), abrasion resistance improved 6 times according to abrasion test. Finally, joining of the cavities to each other is introduced as the abrasion mechanism by considering the field emission- scanning electron microscope images.

کلیدواژه‌ها English

Blending

Epoxy

Polyurethane

Abrasion

Adhesion

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