Synthesis and identification of water-reducible polyester resin curable with melamine resin and study of its anti-corrosive properties in compare with an imported commercial resin

Document Type : Research Article

Authors

1 Polymer and Color Engineering Department, Amirkabir University of Technology, Tehran, Iran

2 Color & Polymer Research Center, Amirkabir University of Technology

3 Department of Polymer and Color Engineering, Amir Kabir University of Technology, Tehran, Iran

/amnc.2021.10.37.2

Abstract

In this study, polyester resin has been synthesized using linear and cyclic monomers. In the next step, the synthesized resin was neutralized with amine and diluted with water to reach the water reducibility. All products were adjusted to a solid percentage of about 45, which was close to the solid percentage of common commercial resins, and then evaluated. Resin identification was performed using Fourier transform infrared (FTIR), Gel permeation chromatography (GPC) and Differential scanning calorimetry (DSC) tests. By the way, the Thermal gravimetric analysis (TGA) test was used to analyze the thermal degradation of the resin. The highest stability was obtained at pH=7. The synthesized resins were mixed with melamine resin in a weight ratio of 1:4 respectively then applied to the steel sheet for further detailed study of their performance in a coating system. To evaluate the anti-corrosion properties, a salt spray test was done while a commercial polyester resin was used as a reference. The results of the salt spray test showed that despite the hydrophilic nature of the synthesized resin, it shows good water resistance in the coating system.

Keywords

Main Subjects


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