مروری بر پوشش‌های پلاستی‌سول پلی(وینیل کلراید) و رئولوژی آن

نوع مقاله : مقاله مروری

نویسندگان

1 دانشجوی کارشناسی ارشد، گروه پژوهشی رزین و افزودنی‌ها، پژوهشگاه رنگ

2 استادیار، گروه پژوهشی رزین و افزودنی‌ها، پژوهشگاه رنگ

چکیده

پلاستی‌سول یا خمیرهای بر پایه رزین پلی(وینیل کلراید) که به عنوان کف‌پوش، عایق زیربدنه خودرو و دیگر مصارف مشابه استفاده می‌شوند، نوع خاصی از پوشش هستند که دارای مقدار محدودی حلال فرار می‌باشند. این نوع پوشش به دلیل غلظت زیاد رزین و امکان اعمال ضخامت بالا، خواص مکانیکی، مقاومت خوردگی و خواص عایق گرمایی بسیار خوبی دارد. سازوکار تشکیل فیلم این نوع پوشش نیز متفاوت است به این ترتیب که پس از اعمال آن روی سطح، با گرمادهی ریزساختار‌ها تغییر کرده و خمیر به حالت ژل فیزیکی می‌رسد. سپس با افزایش بیشتر دما فرآیند ذوب آغاز می‌شود و طی آن ژل حاصله ذوب می‌گردد و ضمن همگن‌شدن و هم‌ترازی به خواص نهایی می‌رسد. مطالعه رئولوژی در این نوع پوشش حائز اهمیت است، زیرا پلاستی‌سول در ابتدا حالت خمیری دارد و معمولا به روش افشاندن اعمال می‌شود و کنترل فرآیند‌های ژل و ذوب نیز با استفاده از رئولوژی امکان‌پذیر است. در این مقاله ابتدا به معرفی پلاستی‌سول، ترکیبات آن و فرآیند‌های ژل و ذوب می‌پردازیم، سپس مروری بر عوامل موثر بر رئولوژی آن خواهیم داشت.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

A Review on the Poly (Vinyl Chloride) Plastisol Coatings and Its Rheology

نویسندگان [English]

  • Behrouz Eftekhari 1
  • Malihe Pishvaei 2
1 Department of Resin and Additives, Institute for Color Science and Technology
2 Department of Resin and Additives, Institute for Color Science and Technology
چکیده [English]

Coatings based on plastisol or paste of poly (vinyl chloride), which are mainly used as flooring and automotive underbody coatings, are a special type of coating that has a limited amount of volatile solvent. Due to the high concentration of the resin and the possibility of applying high thickness, this type of coating has excellent mechanical properties, corrosion resistance, and thermal insulation properties. The mechanism of film formation of this type of coating is also different so that after applying it on the substrate, the microstructures are changed by heating, thus the paste becomes a physical gel. Then with the further increase of temperature, the fusion process begins, in which the gel is melted and reaches the final properties while homogenizing and leveling. It is important to study the rheology of plastisol coatings, both at the beginning which is in the form of a paste that is usually applied by spraying and after being subjected to gelation and fusion processes, which can be controlled using rheology. In this article, we will first introduce plastisol, its components followed by gelation and fusion processes, and lastely we will review the factors affecting the rheology of poly (vinyl chloride) plastisol.
 

کلیدواژه‌ها [English]

  • Plastisol
  • poly (vinyl chloride)
  • automotive underbody coating
  • gelation and fusion
  • Rheology
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