A kind of preparation method of glass flakes modified by carboxyl-terminated nitrile rubber coating

Abstract

The invention provides a preparation method for carboxyl-terminated nitrilo butadiene rubber coated and modified glass flakes. The preparation method comprises the following six steps: drying treatment of glass flakes; water-removing treatment of carboxyl-terminated nitrilo butadiene rubber; water-removing treatment of a solvent; preparation of a slurry; preparation of surface activated and modified glass flakes; preparation of the carboxyl-terminated nitrilo butadiene rubber coated and modified glass flakes. The preparation method has the advantages that the surfaces of the glass flakes are subjected to grafting modification according to an organic / inorganic hybridization method, so that chemical bonding is formed between the glass flakes and epoxy resin, the interface compatibility between the glass flakes and epoxy resin can be remarkably improved, the problem that an inorganic filler on the surface of paint is liable to fall off under the pressure alternating condition is solved, the corrosion resistance and the penetration resistance of an corrosion-resistant coating can be remarkably enhanced, and the service life of the corrosion-resistant coating can be remarkably prolonged; the carboxyl-terminated nitrilo butadiene rubber coated and modified glass flakes can be not only independently added into corrosion-resistant paint, but also combined with other fillers of the corrosion-resistant paint for use, so that the water absorption of the corrosion-resistant coating is reduced from 5% to 3%, the shock resistance is improved from 30 cm to 40 cm, and the flexibility value is reduced from 3 mm to 2 mm.

Description

technical field [0001] The invention belongs to the technical field of coatings, in particular the invention relates to a method for preparing glass flakes coated and modified by carboxyl-terminated nitrile rubber. Background technique [0002] A large number of studies have shown that adding glass flake fillers to anti-corrosion coatings can change the structure of the coating and improve the corrosion protection performance of the coating. Because the glass flakes are arranged parallel to each other and overlapped inside the coating, it not only divides the coating into many small spaces and greatly reduces the shrinkage stress and expansion coefficient of the coating, but also forms a barrier to prevent the diffusion of corrosive media, prolonging the penetration of corrosive media into The time of the substrate, thus effectively enhancing the anti-penetration performance and mechanical strength of the coating, and improving the anti-corrosion performance. [0003] Epoxy...

AI Technical Summary

Problems solved by technology

However, due to the huge difference in surface energy between glass flakes and epoxy resin, the interface between the two is a fragile physical bond, so it is difficult for glass flakes to disperse evenly in epoxy resin, resulting in a large number of microscopic defects during the curing process of the coating.

Especially under the action of alternating pressure in the deep sea environment, the inorganic filler on the surface of the coating is easy to fall off, and the probability of toughness and brittle fracture of the coating is greatly increased, thereby reducing the mechanical properties of the anti-corrosion coating and affecting the service life

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