The Scaly Inorganic Packing Modification And Its Effects On Properties Of The Coating

The scaly inorganic packing possesses the characteristics of close overlap and parallel arrangement, which can improve the compactness and anti-permeability of coatings. Glass flake is widely used in anticorrosive coatings due to its excellent chemical stability, rust resistance, alkali resistance, salt fog resistance, and weather resistance. However, the glass flake has a bad compatibility with the polymer due to the significant difference between their chemical structure and physical form, which seriously affected the anticorrosion performance of the coating. Therefore, the surface modification of the glass flake has become an issue in research recently.The purpose of the research is to improve the compatibility between the glass flake and the resin. The surface activation-modified glass flakes were prepared by usingtoluene-2,4-diisocyanate, hexamethylene diisocyanateand 2,3-Epoxypropoxy propyltrimethoxysilicane as the active bridging agent, respectively. The GF-g-CTBN were prepared by grafting carboxyl-terminated liquid nitrile rubber on the surface of the GF-TDI, the GF-HDI andthe GF-KH560. The GF-TDI-BTA and the GF-TDI-05 FD were prepared by grafting 1H-Benzotriazole and N,N-Carbonyldiimidazoleon the surface of the GF-TDI. The modified effects were characterized by FTIR, SEM, and EDS. The epoxy varnish paints were prepared by using the common and modified glass flake, E44, and NX2015 as the filler, film-forming materials, and curing agent, respectively. The effect of modified glass flake on the adhesion, chemical resistance, shear and tensile properties, water absorption, impact resistance of the coatings were investigated.It was found from the results that the characteristic peaks of organic matters and the elements of carbon and nitrogen were showed up on the surface of the modified glass flake. Moreover, the surface morphology of the modified glass flakes exhibited significant changes compared to the common ones, which indicated that the surface of glass flakes were successfully covered with organic matters. The modified glass flakes had good compatibility with the resin, and uniformly dispersed in the coatings. Additionally, the adhesion, chemical resistance, shear and tensile properties, anti-penetration properties, impact resistance of the epoxy varnish coatings were improved. The as-prepared modified glass flakes are significant in improving the performance and increasing the lifespan of the anticorrosive coatings, as well as enlarging the application range of the glass flake packing.