低温TGIC固化耐候性粉末涂料用聚酯树脂的合成及性能研究

Preparation and Properties of Polyester Resin for Low Temperature Curable TGIC-Based Weatherable Powder Coatings

合成了一种低温固化粉末涂料用聚酯树脂,测试了树脂酸值和玻璃化温度等理化指标,分别对聚酯树脂粉末涂料进行了抗粉霜性能测试、高压水煮测试和老化测试。通过差示扫描量热仪(DSC)采用不同升温速率对其固化动力学进行了研究;采用Kissinger方程和Crane方程对固化动力学方程参数中的活化能Ea、频率因子A0、反应级数n进行了计算,得到了固化动力学理论方程。该聚酯树脂既满足了低温固化的反应活性,又能保证在低温固化过程中粉末涂料具有良好的流平,由该聚酯制得的由TGIC固化的低温固化粉末涂料具有良好的涂膜性能、优异的抗粉霜性能、良好的耐水和耐候性能。

A polyester resin for low temperature curing powder coatings was synthesized,and the physical-chemical properities of the resin were tested,such as acid value and glass transition temperature.The chalking resistance,high pressure anti-boiling and aging resistant properties of the powder coatings were also tested.The curing kinetics were studied via different heating rates by differential scanning calorimeter(DSC).Furthermore,by using Kissinger equation and Crane equation,some parameters including activation energy Ea,frequency factor A0 and the reaction order n were calculated to obtain a theoretical equations of curing kinetics.The results showed that the polyester resin satisfied the reaction activity of the low temperature curing process,meanwhile,ensured a good leveling property of the powder coatings during low temperature curing process.The low temperature curing powder coatings based on the polyester resin had good film properties such as chalking resistance,high pressure anti-boiling and aging resistance.