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Zastosowanie nanoczastek o zaprojektowanej budowie jako modyfikatorow farb proszkowych = : Use of nanoparticles of designed structure as modifiers of powder coatings

Properties and surface structure of coats made of titania-filled epoxy-polyester powder coatings produced by using silicone-acrylic powders as additives were presented. The powders were agglomerates of nanoparticles of core-shell architecture where core was a silicone resin of glass transition at -1... Full description

Contained in: Inzynieria materialowa Vol. 28, No. 5 (2007), p. 863-866
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ISSN: 0208-6247
Additional Keywords: ABRIEBFESTIGKEIT
KERNSTRUKTUR
MIKROGEFUEGE
NANOPARTIKEL
NANOPULVER
POLYMETHACRYLSAEUREESTER
PULVERLACK
SCHLAGFESTIGKEIT
SILICON:POLYMER
Notes: Copyright: Metadaten: TEMA, Copyright WTI-Frankfurt eG
Copyright: (C) Alle Rechte beim Herausgeber
Physical Description: 4 Seiten, 8 Bilder, 1 Tabelle, 15 Quellen
PPN (Catalogue-ID): WTI04588546X
Note: WTI TEMA DB
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Internes Format
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245 0 0 |a Zastosowanie nanoczastek o zaprojektowanej budowie jako modyfikatorow farb proszkowych =  |b Use of nanoparticles of designed structure as modifiers of powder coatings 
300 |a 4 Seiten, 8 Bilder, 1 Tabelle, 15 Quellen 
500 |a Copyright: Metadaten: TEMA, Copyright WTI-Frankfurt eG 
500 |a Copyright: (C) Alle Rechte beim Herausgeber 
520 |a Properties and surface structure of coats made of titania-filled epoxy-polyester powder coatings produced by using silicone-acrylic powders as additives were presented. The powders were agglomerates of nanoparticles of core-shell architecture where core was a silicone resin of glass transition at -110 deg C and shell was a methacrylic polymer of glass transition temperature 140 deg C. The powders were produced by spray drying of aqueous hybrid silicone-acrylic dispersions prepared by emulsion polymerization. The coatings contained nanoparticles of poly(methyl methacrylate), methyl methacrylate-glicydyl methacrylate copolymer and methyl methacrylate-acrylic acid. Core to shell mass ratio was 40/60. An improvement of extrudability of coatings modified with 3 % of powders was achieved. The edges of particles of the unmodified powder were more sharp than those of modified powder. No difference in appearance of coatings after 4 weeks storage at 40 deg C was observed. Substantial properties of the coats obtained from modified coatings were much better than those observed for unmodified coating. In particular, significant improvement was observed for impact resistance and drawability. The brittleness of the coats was considerably diminished due to addition of silicone-acrylic powders. The structural difference between unmodified coats and coats modified with 3 % of powder were evidenced by SEM studies of brittle fracture surfaces. The migration of silicone resin to the surface was evidenced by electron spectroscopy and chemical analysis. The content of silicon in the surface layer was 10 times higher than the calculated from average content of silicon in total mass of the coat (ca. 0.45 %). 
653 4 |a PULVERLACK 
653 4 |a NANOPULVER 
653 4 |a NANOPARTIKEL 
653 4 |a SCHLAGFESTIGKEIT 
653 4 |a ABRIEBFESTIGKEIT 
653 4 |a MIKROGEFUEGE 
653 4 |a KERNSTRUKTUR 
653 4 |a SILICON:POLYMER 
653 4 |a POLYMETHACRYLSAEUREESTER 
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