Underwater solventless epoxy anti-corrosive coating and preparation method thereof

Abstract

The invention relates to an underwater solventless epoxy anti-corrosive coating and a preparation method thereof. The coating contains A component and B component and comprises the following components by weight percent: 20-25% of epoxy resin E-51, 12-17% of epoxy resin E-44, 3-8% of epoxy active diluent, 3.5-5% of plasticizer, 10-16% of talcum powder, 10-15% of sericite powder, 1.0-1.6% of thixotropic agent, 2-4% of titanium dioxide, 0.5-1.0% of coupling agent, 0.5-1.2% of dispersant, 0.5-1.2% of defoaming agent, 0.1-0.5% of carbon black, 12-15% of 1085 curing agent and 5-8% of 810 curing agent; wherein, B component comprises 1085 curing agent and 810 curing agent and the remainder is A component. The preparation method comprises the following steps: separately preparing A component and B component and when using, mixing A component and B component in a weight ratio of 4:1 evenly to obtain the underwater solventless epoxy anti-corrosive coating. The invention has simple process, strong product adhesion, high mechanical strength and corrosion resistance; the coating can be especially used to coat members in water at a low temperature, has fast curing rate and good flexibility of coating film, and is hard to peel, thus being applicable to the protection of steel structures such as gates of hydroelectric power stations, sediment bottom sluices and the like and concrete structures.

Description

Technical field: [0001] The invention relates to a preparation method of an anti-corrosion coating, in particular to a solvent-free epoxy anti-corrosion coating which can be painted under low temperature conditions and a preparation method thereof. Background technique: [0002] The steel structure and concrete structure in the water environment will be corroded by water for a long time, which will greatly shorten its life. If it is not repaired in time, there will be safety hazards. The existing anti-corrosion coatings are solvent-free anti-corrosion coatings based on epoxy resin. Most of them require the coating substrate to be dry during application, and cannot be painted on components in wet environments and water. At present, there are coatings that can be applied underwater on the market, but these coatings are difficult to apply in water at low temperature (5-12°C), and the coating film is brittle after curing, and it is easy to peel off in large pieces under the impa...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the shortcomings of the prior art, aiming at the shortcomings of the prior art that the coating cannot be coated at low temperature, the adhesion is not strong, the cured coating film is brittle, and the impact resistance and wear resistance are poor, to provide a coating that can be used at low temperature. The underwater environment-friendly epoxy anti-corrosion coating and its preparation method are used to coat the components in the water environment, have high adhesion, and can withstand the impact of sandy water flow for a long time