Influence of Silane Modified Wollastonite on Properties of Waterborne Anticorrosion Coatings

In coatings, pigments and fillers mainly rely on the host resin and dispersing additives to achieve uniform dispersion.

In water-based anti-corrosion coatings, the film-forming material is suspended in the system by emulsification, which is different from the resin in solvent-based coatings, which can be fully swelled in the system.

As a commonly used filler, wollastonite also faces the problem of agglomeration in water-based coatings.

Yi Minhua et al.

(1) The coating film has excellent resistance to salt spray.

(2) The adhesion between the coating film and the substrate and the water contact angle of the coating film gradually increased with the increase of the amount of silane coupling agent

(3) Silane-modified wollastonite can effectively improve the medium corrosion resistance of the coating film, especially in the coating film resistance to salt spray, salt water and humidity and heat

(4) The reasons for the improvement of the medium corrosion resistance of the modified wollastonite coating are as follows: first, the wollastonite achieves good dispersion in the matrix resin through the silane modifier, and the silane coupling agent passes through the hydrolyzed hydroxyl and The surface of wollastonite is anchored, and at the same time, the epoxy group is combined with the matrix resin, which improves the wetting and dispersion of the resin to wollastonite, strengthens the interface between the filler and the resin system, and effectively prevents the damage of external forces and media.