The Effect of the Modification of Mica by High-Temperature Mechanochemistry on the Anticorrosion Performance of Epoxy Coatings.

Yahui Cai,Yu Cui,Li Liu,Fandi Meng,Rui Liu,Hongpeng Zheng,Fuhui Wang

doi:10.3390/polym13030378

Yahui Cai, Yu Cui + Show 5 more

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https://doi.org/10.3390/polym13030378

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Journal: Polymers	Publication Date: Jan 26, 2021
Citations: 14	License type: CC BY 4.0

Affiliation: Northeastern University, Chinese Academy of Sciences

Abstract

Epoxy resin was directly grafted onto the surface of mica powder by high-temperature mechanical ball milling. This method was used to achieve a chemical reaction between the epoxy resin and mica that cannot be carried out under conventional circumstances. The results show that an epoxy resin layer with a thickness of approximately 10 nm formed on the surface of the mica. This modified mica filler exhibited a significant change in its hydrophilic properties. The dispersion of mica and its compatibility with organic coatings also significantly improved. In addition, the modified mica filler was added to the epoxy coating. The improvement of the coating’s compactness and toughness is the reason for its anti-corrosion performance enhancement.

Highlights

Epoxy resin has excellent adhesion; low shrinkage; and good permeability resistance to water, acids, alkalis, and other corrosive media
The epoxy resin and mica were weighed and mixed according to a mass ratio of 1:1, and the mixture was added into the grinding tank of the 500 mL high-temperature ball mill for the grinding test
Under the mechanochemical modification treatment at room temperature, the average particle size of the mica drops to 4.01 μm

Summary

Introduction

Epoxy resin has excellent adhesion; low shrinkage; and good permeability resistance to water, acids, alkalis, and other corrosive media. It has been commonly used as an anti-corrosion coating in both industrial and daily-life applications [1,2,3,4,5,6,7]. Mica can theoretically improve the anti-permeability and strength of the coating [16]. It can reduce the number of high-priced pigments and decrease the costs. Direct additions of inorganic mica into organic coatings tend to result in poor dispersion, agglomeration, and the formation of a large number of pores and cracks in the coating, which lead to the degradation of the coating performance [17]

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Results

Conclusion