In order to understand the explosion hazard of powder coatings during spraying process，the explosion kinetics and thermodynamic parameters of epoxy，polyester and acrylicpowder coatings were studied by means of Siwek 20L sphere explosive device. At the same time，combined with TG and DSC analysis methods in different atmosphere，the hazard of explosion process of different kinds of powder coatings were compared. The results showed that the acrylic powder coatings showed the highest maximum explosion pressure and pressure rising rate among the three，which were 0. 730 MPa and 76. 0 MPa /s，and the explosion hazard grade was St2 grade. The maximum explosion pressure and pressure rising rate of polyester powdercoatings were the lowest，which were 0. 617 MPa and 37. 9 MPa /s，and the explosion hazard grade was St1 grade. The glass transition temperatures of epoxy，polyester and acrylic powder coatings were 62 ℃，57 ℃ and 58 ℃ rescpevtively. The weight loss rates in inert atmosphere were 52. 9%，98. 0% and 97. 3%. And the air atmosphere could increase the weight loss rate.
QIN Wen-Jing
,
FAN Bin
,
LIU Jia-Wei
,
WANG Yao
,
XIAO Qiu-Beng
. Study on Explosion Kinetics and Thermodynamics of Powder Coatings[J]. Paint & Coatings Industry, 2019
, 49(11)
: 40
-44
.
DOI: 10.12020/j.issn.0253-4312.2019.11.40
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