Journal
PROGRESS IN ORGANIC COATINGS
Volume 150, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.porgcoat.2020.105974
Keywords
Waterborne epoxy coating; Labyrinthine structure; [3-(2-aminoethyl) aminopropyl]; trimethoxysilane; Modified graphene oxide
Funding
- State Key Laboratory of New Ceramic and Fine Processing Tsinghua University [KF201908]
- special project of achievements transformation of Qinghai Provincial Department of science and technology [2018-NN-149]
- support project of innovation and entrepreneurship training by Qinghai University [2019QX-08]
- innovation project of Kunlun elitist of Qinghai Province and training program for famous teachers of Qinghai university
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The new environmentally friendly modified graphene oxide/waterborne epoxy composite coating exhibited excellent corrosion resistance and slight harm to the environment. The modified graphene oxide improved dispersion and reduced aggregation, leading to a labyrinth structure corrosion path in the coating for enhanced protection efficiency.
A new environmentally friendly modified graphene oxide/waterborne epoxy composite coating (W-EMGO) is reported. The composite coating, developed by introducing graphene oxide modified with [3-(2-aminoethyl) aminopropyl] trimethoxysilane (MGO) into waterborne epoxy, exhibited excellent corrosion resistance and slight harm of solvent-based coating to the environment. The MGO displayed perfect dispersion and corrosion resistance, which reduced the aggregation of graphene oxide (GO) due to the coupling of functional groups. After modification, the lamellar structure of GO remains unchanged, and the interlayer spacing was increased. Crosslinking with resin to form a labyrinth structure corrosion path in the coating. Furthermore, the conductivity of GO decreased after the insertion of functional groups. The results demonstrated that the composite with a 0.5 wt.% content of MGO presented remarkably improved corrosion resistance with a protection efficiency (PE) of 99.7%.
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