Method for preparing organic montmorillonite/polyurethane self-repair coating

Abstract

The invention discloses a method for preparing an organic montmorillonite / polyurethane self-repair coating. The method comprises the following steps: (1) organic treatment of montmorillonite, namely slowly adding an acidified modifier into an intensely stirred montmorillonite water solution, reacting at 80 DEG C for 24 hours, centrifuging, washing to obtain modified montmorillonite, then dissolving the modified montmorillonite into a mixed solvent (the ratio of ketone to deionized water is 1:1), intercalating a corrosion inhibitor into the modified montmorillonite, vacuumizing for 5 hours, washing, grinding, and sieving with a 350-mesh sieve to obtain organic montmorillonite; (2) preparation (parts by mass) of the organic montmorillonite / polyurethane self-repair coating, namely uniformly mixing 50-80 parts of hydroxyl resin, 1-5 parts of the organic montmorillonite, 1-40 parts of the mixed solvent and 3-10 parts of aid into a high-speed ball mill to obtain organic montmorillonite / hydroxyl resin, then uniformly mixing the modified hydroxyl resin and a curing agent at a certain mass ratio to obtain the organic montmorillonite / polyurethane self-repair coating, and drying and curing to form an organic montmorillonite / polyurethane self-repair coating layer.

Description

[0001] technical field [0002] The invention relates to a preparation method of an organic montmorillonite / polyurethane self-repairing coating, which belongs to the technical field of chemical coatings. Background technique [0003] Montmorillonite is a clay mineral with a 2:1 three-layer structure. Its unit cell is composed of two layers of silicon-oxygen tetrahedron sandwiching a layer of aluminum-oxygen octahedron. The tetrahedron and octahedron are connected by sharing oxygen atoms. The layer thickness is about 0.96nm, with exchangeable Na between the layers + , K + , Mg 2+ , Ca 2+ Ions, they are easily replaced by organic cations. These organic cations can change the surface of montmorillonite from hydrophilic to lipophilic, thereby reducing its surface energy and improving its compatibility with organic polymer monomers. When organic cations When it has an active functional group that reacts with the polymer monomer, its strong interaction can promote the inte...

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Problems solved by technology

However, there are still few relevant research reports on the effect of montmorillonite prepared by surface modifier first and then intercalation treatment on the corrosion resistance of polyurethane coatings.

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