High-solid epoxy coating as well as preparation method and application thereof

Abstract

The invention relates to a high-solid epoxy coating as well as a preparation method and application thereof. The high-solid epoxy coating comprises 20-50 parts of liquid epoxy resin; 5-20 parts of solid epoxy resin; 5-15 parts of a reactive diluent; 0-20 parts of an organic solvent; the component B comprises the following raw materials in parts by weight: 60-100 parts of a Manny base curing agent; 0-40 parts of a polyamide curing agent; 0.5 to 3 parts of a curing accelerator; the weight ratio of the component A to the component B is 100: (15-35), and the curing accelerator is a compound of phenols and organophosphate. The phenol and/or organophosphate are/is used as the curing accelerator, so that the curing speed is increased, the curing temperature is reduced, and the purpose of further shortening the hard drying time under the condition of high solid content is achieved. Organophosphate containing carboxyl or hydroxyl as a functional group plays a role of a cross-linking agent, so that the coating forms a more compact net-shaped structure, and the strength and toughness of a paint film are more excellent. And the use of organophosphorus ester can improve the water resistance of the paint film. The paint film prepared by the invention has good water resistance.

Description

technical field [0001] The invention relates to the field of coatings, in particular to a high-solid epoxy coating, a preparation method and an application thereof, and belongs to the technical field of coatings. Background technique [0002] As humans pay more and more attention to the ecological environment, governments of various countries have imposed strict restrictions on the VOC content in coatings. Therefore, high solid content, solvent-free, powder, and water-based coatings can be developed rapidly. Especially in the coatings of modern automobiles and rail vehicles, in order to avoid major changes in the construction production line, high-solid coatings are one of the fastest-growing coatings. Due to its construction performance and required construction conditions of high-solid coatings are basically the same as those of solvent-based coatings, the original coating line can be used without major modification. Most of the high-solid coatings use epoxy resin, polye...

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Problems solved by technology

Patent CN201110351130.6 discloses a high-performance, high-solid general-purpose modified epoxy antirust coating and its preparation method. Group A is: E44 epoxy resin 10-20; NPPN-631 epoxy resin 10-20; terpene Resin 5-15; Indene resin 4-18; BYK defoamer 0.1-1.0; HX leveling agent 0.1-1.0; rheological additive 0.1-1.5; active silica 5-20; mixed solvent 10-20; Pigment and filler 10-30; B component: cardanol modified amine 10-40; modified silane coupling agent 0.5-3, the solid content of the coating can only reach more than 71%, but the viscosity exceeds 1000mpa s , and the hard drying time is less than 24h, neither the viscosity nor the curing speed is suitable for the automotive coating process

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