Two-component high zinc epoxy priming paint and preparation method thereof

Abstract

The invention provides a two-component high zinc epoxy priming paint and a preparation method thereof. The two-component high zinc epoxy priming paint comprises a component A and a component B; the component A is a modified polyamide curing agent; the component B comprises 6-9wt% of epoxy resin, 0.2-0.5wt% of a modified polyamide wax thickener, 5-10wt% of an alcohol and alcohol ether ester environmentally-friendly solvent, 0.3-1wt% of a silane coupling agent and 80-88wt% of zinc powder; and the two-component high zinc epoxy priming paint is prepared by mixing the component A with the component B according to a weight ratio of the component B to the component A of 100:(2-5). The priming paint adopts the curing agent to cure, and can resist various solvents, the mass fraction of solids is greater than 90%, the zinc content in non-volatile matters reaches above 96%, a film obtained by using the priming paint has high hardness and good adhesion and can provide good protection when a coating layer is damaged, and the priming paint has the advantages of no layering or precipitation after long-term storage, convenient construction, low surface treatment requirements, and easy popularization.

Description

technical field [0001] The invention belongs to the technical field of coatings, in particular to a two-component high-zinc epoxy primer coating. Background technique [0002] Metal corrosion pervades all fields of national production, from daily life to industrial and agricultural production, from the realization of new technology to the development of cutting-edge science, there are corrosion problems. Due to corrosion, equipment and facilities fail, which not only consumes precious resources and energy, but even causes catastrophic accidents, resulting in huge direct economic losses, and indirect economic losses are difficult to estimate. [0003] Therefore, it is necessary to use coating anti-corrosion technology, and epoxy zinc-rich primer is currently commonly used anti-corrosion coating. [0004] 1. The content of metal zinc in the two-component dry film of epoxy zinc-rich paint in the prior art is low. When the coating film is aged and damaged, the paint film will l...

AI Technical Summary

Problems solved by technology

[0006] 3. It is called cold galvanized coating: the cold galvanized coating developed by Tsinghua University and related units is a high solid content composed of new polymer resin, specially treated zinc powder, special additives and composite solvents One-component coating; Roval cold galvanized products are one-component zinc-rich coatings with high zinc content, which are formulated from three parts: zinc powder with a purity higher than 90%, volatile solvents and organic resins The amount of galvanized coating (more than 96% zinc in the dry film); 82. One-component anti-corrosion cold-dip galvanized coating, a high-performance galvanizing agent with a thin film pure zinc content of 95%; American CRC model 18412, named cold-dip galvanized paint, containing 95% zinc; they are all one-component coatings, The content of zinc powder in the dry film is more than 95%, and the cathodic protection and barrier protection of zinc are used to protect steel, which has low hardness, poor adhesion, and cannot meet the matching requirements.

[0007] One-component epoxy anti-corrosion coatings and cold-dip galvanized coatings mainly rely on solvent volatilization or oxidative drying to form films. They have poor solvent resistance and will be re-dissolved when encountering soluble solvents. At the same time, the paint film has low hardness and high adhesion. Less than the adhesion specified by the two-component epoxy resin coating, it is not indicated in the supporting requirements of the ISO12944-5:2007 standard that it can be used, making it difficult to promote and apply the product