پوششهای ضدحریق و مقاوم در برابر آتش: مروری بر مبانی، بهینهسازی فرمولاسیون و فناوریهای نوین
محورهای موضوعی : پلیمرها در انرژی و کاربردهای بهداشتی و محیطی
1 - پژوهشگاه نیرو
کلید واژه: پوششهای منبسطشونده, پوششهای غیرمنبسطشونده, نانوکامپوزیت, روش سل-ژل, حفاظت غیرفعال در برابر آتش, بهینهسازی فرمولاسیون.,
چکیده مقاله :
پوششهای ضدحریق و مقاوم در برابر آتش به عنوان یکی از کارآمدترین و اقتصادیترین راهکارهای حفاظت غیرفعال، نقش کلیدی در تأخیر اشتعال، کاهش انتقال حرارت و محدود کردن گسترش شعله ایفا میکنند. این مقاله مروری با هدف نظاممندسازی دانش موجود در چهار حوزه اصلی تدوین شده است: نخست، مبانی و سازوکارهای عملکرد با تمایز دو دسته پوششهای منبسطشونده (تشکیل لایه زغالی متورم با قابلیت انبساط تا ۱۰۰ برابر) و غیرمنبسطشونده (مکانیسم فاز گازی یا تشکیل لایه شیشهای). دوم، بهینهسازی فرمولاسیون مبتنی بر شواهد تجربی صنعتی که نشان میدهد انتخاب چسب پلیمری مناسب، نسبت بهینه اجزای اصلی و افزودنیهای نانورسی و الیاف تقویتکننده تأثیر مستقیمی بر پایداری حرارتی و یکپارچگی لایه زغالی دارند. سوم، فناوریهای نوین نظیر نانوکامپوزیتها و روش سل-ژل که با ایجاد پوششهای شفاف و حفظ زیبایی زیرلایه، دامنه کاربرد این سامانهها را به طور قابل توجهی گسترش دادهاند. در بخش پایانی، با توجه به چالشهای مرتبط با کاربرد مستقیم پوششها بر روی زیرلایههای حساس (آسیبهای شیمیایی، کاهش استحکام و تغییرات ظاهری)، رویکرد «کاربرد غیرمستقیم» بر روی مواد پشتیبان به عنوان راهکاری کمتأثیر و منطبق با اصول برگشتپذیری پیشنهاد میشود. با این وجود، فقدان پژوهشهای نظاممند در مقایسه مستقیم فرمولاسیونهای مختلف و ارزیابی پایداری طولانیمدت این پوششها، همچنان یک خلا اساسی در دانش فعلی است.
Fire-retardant and fire-resistant coatings, as one of the most efficient and cost-effective passive protection strategies, play a key role in delaying ignition, reducing heat transfer, and limiting flame spread. This review article aims to systematize the existing knowledge in four main areas: first, the fundamentals and mechanisms of action, distinguishing between two categories of intumescent coatings (forming a swollen char layer with expansion capability of up to 100 times) and non-intumescent coatings (gas-phase mechanism or glassy layer formation). Second, formulation optimization based on industrial experimental evidence, demonstrating that the selection of an appropriate polymer binder, optimal ratio of main components, and nano-clay and reinforcing fiber additives have a direct impact on the thermal stability and integrity of the char layer. Third, emerging technologies such as nanocomposites and the sol-gel method, which, by creating transparent coatings while preserving the aesthetic appearance of the substrate, have significantly expanded the application range of these systems. In the final section, considering the challenges associated with the direct application of coatings onto sensitive substrates (chemical damage, reduced mechanical strength, and aesthetic alterations), the "indirect application" approach onto supporting materials is proposed as a low-impact strategy consistent with the principles of reversibility. Nevertheless, the lack of systematic studies in direct comparison of different formulations and evaluation of the long-term durability of these coatings remains a fundamental gap in current knowledge.
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