Epoxy anti-corrosive paint for underwater construction and preparation method

Abstract

The present invention relates to a smearing epoxy anti-corrosion coating for underwater concrete and steel structure and the preparation thereof, comprising the blending of component A and component B. The present invention is characterized in that the Component A consists of 20-40wt percent of solvent-free epoxide resin, 0-6wt percent of glycidyl ether epoxy active diluent, 13-50wt percent of barite powder, 0-30wt percent of titanium pigment, 0.5-2wt percent of modified polyamide thixotropic agent, 0.2-0.5wt percent of dispersant, 0.2-0.5wt percent of defoamer and 1-4wt percent of resin acceptor; the preparation viscosity is 40000-120000cP and the proportion is 1.5-2.5. The component B consists of 10-30wt percent of C5-C20 hydrocarbon chain Mannich di-benzene-ring epoxy curing agent, 2-10 percent of reaction typed promoter, 2, 4, 6-tri-dialkyl amine alkylamine methyl phenol. The coating of the invention has the advantages of strong adhesive attraction at the initial stage, excellent initial adhesive attraction under dynamic water, quick solidification in underwater construction and no drain and spalling, and can resist the impact of water with the speed of 1m per second, realize initial set in an hour to reach 30-50 percent of the design strength and reach more than 1MPa of bond strength in 24 hours, thereby overcoming the disadvantage of difficult coating under dynamic water of the existing epoxy coating.

Description

technical field [0001] The invention relates to an epoxy anti-corrosion coating, in particular to the epoxy anti-corrosion coating applied underwater on concrete and steel structures and its preparation. Background technique [0002] The strong corrosiveness of seawater will cause corrosion of concrete and steel structures, shorten the effective life, and endanger safety. Various existing anti-corrosion coatings such as epoxy anti-corrosion coatings, due to relatively low initial viscosity and poor initial adhesion, usually can only adhere to dry surfaces. Underwater construction will cause coating loss and peeling, especially more difficult to apply under dynamic water fixed. [0003] Chinese patent CN200610078029.7 discloses a heavy-duty anti-corrosion coating, by weight percentage: modified benzene-free epoxy resin 42-45, T31 type anion-cation exchange grease 8-10, 2500 mesh JS talcum powder 9-11, 2000 mesh UV quartz Powder 13-15; GE titanium dioxide 5-7, SPA-1 defoamer...

AI Technical Summary

Problems solved by technology

Although the surface drying time is shortened compared with the previous patent, it still takes 4 hours and hard work takes 24 hours. It also fails to effectively solve the problem of paint loss and peeling in underwater construction, especially in dynamic underwater construction. It is still difficult to use in dynamic underwater construction. ;Secondly, the coating has high requirements on the surface of the attachment, and the surface treatment must reach at least ST3 level, which is difficult to be used for underwater concrete surface coating

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