کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7107281 | 1460525 | 2015 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Studies on silicone-acrylic hybrid aqueous dispersions and corresponding silicone-acrylic nanopowders designed for modification of powder coatings and plastics
ترجمه فارسی عنوان
مطالعات بر روی پراکندگی آب های هیدرولیک سیلیکون-اکریلیک و نانوپودرهای سیلیکون-اکریلیک مربوط به اصلاح پوشش پودر و پلاستیک
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کلمات کلیدی
پوشش پودر اپوکسی و پلی استر، پوشش پودر پلی استر، هسته نانوذرات پوسته، اصلاح کننده تاثیر، سیلیکون،
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
تکنولوژی و شیمی فرآیندی
چکیده انگلیسی
Epoxy-polyester and polyester coatings were modified with 3% of NP-DASI “nanopowders” consisting of core-shell nanoparticles having silicone resin of very low glass transition temperature (Tg) in the core and poly(methyl methacrylate) of high Tg in the shell. The nanopowders were obtained through spray drying of corresponding aqueous dispersions with core-shell particle structure which were synthesized in a process of emulsion polymerization of methyl methacrylate monomer in aqueous dispersions of silicone resins with different compositions resulting from different compositions of silicone monomers used for their synthesis. A designed experiment was conducted where the effect of composition of silicone resin on the properties of cured coatings was studied. It was confirmed that modification with that “nanopowder” significantly affected the properties of cured coatings, in particular impact resistance and cupping as well as surface properties. Regarding mechanical properties the influence of modification with “nanopowder” was generally more distinct for epoxy-polyester coatings than for polyester coatings. Specifically, great increase in impact and cupping resistance was observed for modified coatings and was explained by absorption of mechanical stresses by particles of low modulus silicone resin which were released from core-shell nanoparticles in the process of curing of the coatings. Other mechanical properties of cured modified and unmodified coatings (abrasion resistance, hardness, scratch resistance, elasticity and adhesion to steel) as well as appearance of the coatings (gloss and whiteness) did not differ much. Water resistance and salt fog resistance were slightly better for modified coatings. Testing the surface properties of modified coatings by XPS and AFM revealed the presence of silicone resin on coating surface what was reflected in higher contact angle and lower SFE as compared to unmodified coatings. That phenomenon was explained by migration of silicone resin to the coating surface.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Progress in Organic Coatings - Volume 78, January 2015, Pages 419-428
Journal: Progress in Organic Coatings - Volume 78, January 2015, Pages 419-428
نویسندگان
Janusz Kozakiewicz, Izabela Ofat, Joanna Trzaskowska, Helena KuczyÅska,