The Effect of Hydroxypropyl Methylcellulose and Silane Coupling Agent on the Performance of Magnesium Phosphate Based Fireproof Coatings for Steel Structures
CHEN Yongda1, HU Zhiqi2, GUAN Yan3,4,*, CHANG Jun2, CHEN Bing4,5
1 School of Civil Enginerering, University of Science and Technology Liaoning, Anshan 114051, Liaoning, China 2 Faculty of Infrastructure Engineering, Dalian University of Technology, Dalian 116024, Liaoning, China 3 School of Material and Metallurgy, University of Science and Technology Liaoning, Anshan 114051, Liaoning, China 4 Liaoning Provincial Magnesium Materials and Magnesium Resources Engineering Research Center, Anshan 114051, Liaoning, China 5 School of Naval Architecture, Ocean & Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
Abstract: A new magnesium phosphate (MPC) based steel structure fireproof coating was modified using two additives, hydroxypropyl methylcellulose (HPMC) and silane coupling agent (SCA), and the influence of these two additives on the macroscopic indicators such as mechanical properties and thermal protection performance of the coating was studied. Analyze the influence mechanism of additives on the hydration process and hydration products of coatings, and explored the effect of additives on the salt corrosion resistance of coatings through electrochemical analysis methods. The results indicate that the addition of HPMC can reduce the dry density and thermal conductivity of coatings, improve the fire resistance of coatings, while SCA has a relatively small impact on these. The addition of two additives will have a negative impact on the compressive mechanical properties of the coating, but on the other hand, it can improve the bonding ability between the coating and the steel plate. The microscopic test results show that the addition of the two additives does not change the phase composition of the coating. The electrochemical test results show that both additives can improve the salt corrosion resistance of the coating.
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2025, Vol. 39 
