Preparation and Properties of Fly Ash-Based Geopolymer Inorganic Coatings

Abstract

Abstract: The fly ash-based geopolymer inorganic coatings were prepared with low-calcium fly ash as the main raw material, sodium silicate and sodium hydroxide as the composite alkaline activator, silane coupling agent (KH550) as the reinforcing material, and silicone acrylic emulsion as the auxiliary film-forming material. The effects of silane coupling agent content, reaction temperature and water-solid ratio on the film-forming property, water resistance and scrub resistance of geopolymer inorganic coatings were studied, and the microstructure and high temperature resistance of inorganic coatings were characterized by XRD, FTIR, SEM, TG-DSC. The results show that, when the preparation temperature, the water-solid ratio and the content of silane coupling agent are 60 ℃, 0.31 (mass ratio) and 3.6% (mass fraction), respectively. The obtained geopolymer inorganic coating has good film-forming performance at room temperature without cracking, the mass water absorption rate of the coating is 1.84% in 24 h, the scrub resistance reaches 12 000 times, and the hardness of 7 d is 154 s. The geopolymer inorganic coating is mainly composed of amorphous aluminosilicate gel. The cluster featured products formed by hydrolysis and bonding of silane coupling agent fill the pores of geopolymer coating, which increase the compactness of the coating and inhibit the generation of cracks. The mass loss rate of the coating is 12.0% to 13.0% when TG-DSC is measured between 25 ℃ and 800 ℃, and no obvious thermal decomposition is found, which indicates that the coating has good high temperature resistance.

Key words: waterborne coating, fly ash, fly ash-based geopolymer, coating, silane coupling agent, film-forming property, water resistance, scrub resistance

CLC Number:

TQ630

FAN Ying, LI Yuan, LIU Changming, YANG Bin, LIU Xueting. Preparation and Properties of Fly Ash-Based Geopolymer Inorganic Coatings[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(12): 4020-4029.

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