مروری بر پلی یورتان های پایه آبی
الموضوعات :
هنگامه هنرکار
1
(تهران)
الکلمات المفتاحية: پلی یورتان های پایه آبی حلال چسب و روکش,
ملخص المقالة :
پلي يورتان هاي پايه آبي از لحاظ علمي، تجاري و صنعتي مورد توجه هستند. امروزه کاربرد حلال های آلی به دليل اشتعال پذیری و همچنین حساسيت بستر نسبت به آن ها، محدود شده است. به دلیل قيمت زياد حلال هاي آلي از طرفی و يكفيتد بسيار خوب پلي يورتا نهاي پايه آبي از سوی دیگر و همچنین با توجه به ملاحظات زيست محيطي دركاهش نشر حلال به اتمسفر، پلي يورتان هاي پايه آبي، جایگزین مناسبی برای حلال های آلی هستند. پلي يورتان هاي پايه آبي شامل مقدار بسيار اندك يا عاری از حلال، غيرسمي و غيرقابل اشتعالند و قابليت كاربرد در چسب و روكش ها را دارند و در دماي محيط تشكیل فيلم مي دهند. به علاوه، چسبندگي عالي به سطوح مختلف از جمله شيشه و الياف پليمري، انعطاف پذيري، خواص رئولوژيکی مطلوب و گرانروي كم در وزن مولكولي زياد از ديگر ویژگی های آن ها است. در این مقاله، روش های سنتزپلی یورتان های پایه آبی مورد بررسی قرار گرفته است.
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