رزین های پلی یورتان اکریلیک پلی ال
اکتبر 14, 2019
رزین های اپوکسی
نوامبر 16, 2019

واکنش هاردنر ایزوسیانات دزمودور n75 با رزین اکریلیک پلی اول پلی یورتان

محاسبه مقدار هاردنر برای رزین اکریلیک پلی ال پلی یورتان

رزین های اکریلیک پلی ال (اول) پلی یورتان polyurethane acrylic polyol resin به همراه هاردنر های ایزوسیانات الیفاتیک محلول در حلال Aliphatic polyisocyanate biuret (HDI homopolymer) مانند Desmodur N 75 bayer  یا Tolonate HDB 75 MX برای تولید پوشش های محافظتی صنعتی و خودرویی استفاده می شوند.

مقدار هاردنر ایزوسیانات الیفاتیک پلی یورتان برای پخت کامل رزین های اکریلیک پلی ال پلی یورتان بسیار مهم است، در صورتی که این مقدار استکیومتر نباشد و هاردنر کمتر باشد پخت به صورت کامل انجام نمی شود که در نتیجه مقاومت شیمیایی، فیزیکی و حلالی مورد نظر بدست نمی آید. در صورتی که هاردنر مورد محاسبه بیشتر از هاردنر مورد نیاز باشد هاردنر های مازاد با رطوبت محیط واکنش می دهند و تولید سفیدک و ناهمواری بر روی سطح مورد نظر می کند همچنین از نظر اقتصادی نیز به ظرر تولید کننده می باشد.

برای محاسبه مقدار هاردنر ایزوسیانات الیفاتیک (در این مورد هاردنرbayer   یا  Tolonate HDB 75 MX) مورد نیاز برای رزین اکریلیک پلی اول ابتدا باید اکی والان وزنی گروه OH را بدست آوریم (اصولا این عدد از سوی تولید کننده داده می شود)

EW OH = equivalent weight of OH in grams = 17 x 100 (%OH)

مقدار هاردنر مورد نیاز:

Hardener (grams) = NCO / OH x EWNCO

مقدار رزین مورد نیاز :

Resin (grams) = EWOH =EW (oh) درصد جامد / درصد کل

اکی والان هاردنر:

Equivalent hardener = EWNCO = 42 x 100 / (%NCO)

مثال:

رزین اکریلیک پلی اول دارای 4% گروه OH و با درصد جامد 60 درصد است

هاردنر مورد استفاده نیز هاردنر ایزوسیانات Covestro Desmodur N 75 BA است

EWOH (مقدار جامد) = 17 x 100 / 4 = 425 gr

EWOH (مقدار رزین) = 425 / (60/100) = 708 gr

.

مقدار استیکیومتر گروه NCO به OH 1 به 1 است:

NCO/OH = 1:1

همانطور که در اطلاعات فنی هاردنر ایزوسیانات Covestro Desmodur N 75 BA آمده است درصد NCO مقدار 16.5 درصد است.

NCO % = 16.5 %  

مقدار هاردنر خالص بدون حلال:

NCO = 42 x 100 / 16.5 = 255 gr

درصد هاردنر 75 درصد می باشد:

Hardener = 255 x 75 / 100 = 280 gr

با استفاده از یک معادله ساده مقدار هاردنر ایزوسیانات Covestro Desmodur N 75 BA مورد نیاز برای 100 گرم رزین های اکریلیک پلی ال (اول) پلی یورتان polyurethane acrylic polyol resin با 4% گروه OH محلول در حلال 60 درصد جامد را بدست می آوریم.

مقدار 39.6 گرم از هاردنر دزمودور N 75 برای پخت کامل رزین مورد نظر لازم است.

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