Thermoplastic polyester resin is known for the fact that the heating condition has an effect on the degree of crystallinity. Therefore, it seems certain that the coating condition will also affect the degree of crystallinity of a coating film. We focused on the relationship between the cooling time employed in the film preparation process and the degree of crystallinity as regards thermoplastic polyester powder we developed. The coating was formed by dipping the test pieces in a fluidized polyester powder vessel. The test pieces were subsequently cooled in air to form the film, and finally immersed in a water bath. We refer to this cooling time in air as the air-cooled time. We found that when the air-cooled time increased, the degree of crystallinity increased. Moreover, as the degree of crystallinity increased, the adhesive strength and the specular gloss decreased. We therefore found that the improvement in the film performance is related to the reduction in the air-cooled time.

Subject
Thermoplastic coatings, Films, Zinc rich coatings, Coatings, Melting, Adhesive strength, Powder coatings, Powders, Polyester, Specular gloss, Thermoplastics, Impact resistance, Test specimen
Keywords:
thermoplastic polyester powder, cooling time, crystallinity, coating film, adhesion force, specular gloss
© 2011 Association for Materials Protection and Performance (AMPP). All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means (electronic, mechanical, photocopying, recording, or otherwise) without the prior written permission of AMPP. Positions and opinions advanced in this work are those of the author(s) and not necessarily those of AMPP. Responsibility for the content of the work lies solely with the author(s).
2011
Association for Materials Protection and Performance (AMPP)
You do not currently have access to this content.