تخمین طول عمر واشرآب بند EPDM طبق اصل انطباق زمان و دما و اثر بارگذاری نانوذرات بر آن

نوع مقاله : پژوهشی اصیل

نویسندگان

1 شیراز، دانشگاه شیراز، دانشکده مهندسی شیمی، نفت و گاز، بخش مهندسی شیمی

2 شیراز، جاده شیراز، سپیدان، صنایع لاستیک فراپیشتاز هونام(فراراب)

چکیده
فرضیه: به دلیل توسعه کاربرد لاستیک­ها در صنایع مختلف ، خصوصیات و طول عمر مفید مواد لاستیکی دارای اهمیت ویژه­ای در مراحل طراحی بوده و منجر به اطمینان از کارایی و ضمانت اجزاء لاستیکی خواهد بود. در این مطالعه، ویژگی­ها و طول عمر مفید قطعات لاستیکی EPDM مورد استفاده به عنوان آب­بند یا درزگیر در لوله های تقویت شده با الیاف شیشه، GRP مورد بررسی قرار گرفت و اثر افزودن نانوذره سیلیکا و جفت­کننده سیلانی Si69بر روی این ویژگی ها مطالعه شد.

روش: در این کار، آزمون­ها تحت شرایط پیرشدگی تسریع یافته انجام گرفت بطوریکه نمونه ها در محدوده دمایی 25-90 درجه سانتیگراد به مدت 60 روز تحت شرایط پیرشدگی قرار گرفتند. سپس تخمین طول عمر نمونه ها با استفاده از اصل انطباق زمان- دما و همچنین با استفاده از مدل ویلیامز لندل فری (WLF) ، بر روی داده­های آزمون­های کشش و مانایی فشار صورت گرفت. آزمون کشش تحت استاندارد ISO 12244 و آزمون مانایی فشار بر اساس استاندارد ISO 815 بر روی نمونه های لاستیکی انجام شد. اثر پیرشدگی بر روی نمونه­های با و بدون نانوذره سیلیکا توسطFTIR بررسی گردید. همچنین از آزمون­های میکروسکوپ الکترونی روبشی (SEM) و میکروسکوپ الکترونی عبوری (TEM) برای مشاهده نحوه پخش ذرات نانوسیلیکا در نمونه های لاستیک EPDM استفاده شد.

یافته ها: بر اساس نتایج به دست آمده، طول عمر مفید به ترتیب برای نمونه های لاستیکی با و بدون و نانوذره سیلیکا و عامل جفت­کننده Si69 در دمای اتاق حدود 63 و 35 سال برآورد شد. مشاهده شد که وجود نانوذرات سیلیکای اصلاح شده خواص مکانیکی و حرارتی EPDM را بهبود می بخشد و همچنین باعث افزایش طول عمر مفید این الاستومر می شود.

کلیدواژه‌ها

موضوعات


عنوان مقاله English

Lifetime Prediction of EPDM Rubber Seals Using Time-Temperature Superposition Principle and the Effect of Nanoparticles Loading on It

نویسندگان English

شادی حسن آجیلی 1
Milad Parsafard 2
1 Shiraz, Shiraz University, Faculty of Chemical, Oil and Gas Engineering, Department of Chemical Engineering
2 Shiraz, Shiraz Road, Sepidan, Farapishtaz Honam Rubber Industries (Farab)
چکیده English

Hypothesis: Because of the widespread use of rubbers in different industries, estimating the rubber material properties and its lifetime are very important in design procedure to assure the quality and safety of the rubber components. In this study, the properties and useful lifetime prediction of EPDM rubber parts used in the production of sealing gaskets and sealants for GRP pipes were investigated and the effect of adding silica nanoparticles as well as Si69 coupling agent on these characteristics was studied.



Methods: In this work, the samples were tested under accelerated aging conditions and aged in the temperature range of 25-90 °C until 60 days. Then time-temperature superposition was carried out on tensile test and compression set results using Williams Landel Ferry (WLF) model to estimate useful lifetime of the samples. Tensile test was conducted under ISO 12244 standard and compression set test was performed according to ISO 815 standard on rubber samples. Aging effect on samples with and without silica was analyzed with FTIR. In addition, scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were performed to observe the dispersion condition of silica nanoparticles in EPDM samples.



Findings: According to obtained results, TEM images showed no sign of nanoparticles agglomeration within the samples due to presence of Si69 and SEM graphs depicted a uniform distribution of particles in the matrix. Using time-temperature superposition principle, the lifetime was estimated about 63 and 35 years at room temperature for the rubber samples with and without silica and Si69 coupling agent, respectively. It was observed that the presence of modified silica nanoparticles improves the mechanical and thermal properties of EPDM and also increases the useful lifetime of this elastomer.

کلیدواژه‌ها English

EPDM rubber
Time-temperature superposition principles
Useful lifetime
silica
Coupling agent
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