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11374 The Effect of Cooling Time on Properties of Thermoplastic Powder Coating Films for Telecommunication Plants

Picture for 11374 The Effect of Cooling Time on Properties of Thermoplastic Powder Coating Films
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Product Number: 51300-11374-SG
ISBN: 2011 11374 CP
Author: Yukitoshi Takeshita, Takashi Sawada, Takao Handa and Tamotsu Kudo
Publication Date: 2011
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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.

Key words: thermoplastic polyester powder, cooling time, crystallinity, coating film, adhesion force, specular gloss
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.

Key words: thermoplastic polyester powder, cooling time, crystallinity, coating film, adhesion force, specular gloss
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