Waterborne polyurethane high gloss finish for engineering machinery, and preparation method of waterborne polyurethane high gloss finish paint

Abstract

The invention provides waterborne polyurethane high gloss finish paint for engineering machinery. The waterborne polyurethane high gloss finish is prepared from a finish paint main agent component A and a composite curing agent component B, wherein the weight ratio of the component A to the component B is equal to (2-6) to 1; every 100 parts of the component A is prepared from the following raw materials in parts by weight: 50-70 parts of emulsion, 3-25 parts of pigment, 5-20 parts of filler, 2-3.5 parts of a wetting and dispersing agent, 2-6 parts of a cosolvent, 0.2-1 part of a leveling agent, 0.2-1 part of a substrate wetting agent, 0.2-1 part of a thickener, 0.2-1 part of a pH regulator, 0.2-1 part of a defoaming agent and the balance of deionized water; the component B is prepared from the following raw materials in parts by weight: 35-75 parts of a curing agent 2655, 20-75 parts of a curing agent 3900, 5-10 parts of a curing agent 401-70 and 20-35 parts of propylene glycol diacetate. The waterborne polyurethane high gloss finish paint provided by the invention solves the problem that a thick-film thick coating is prone to prickly heat, is easy in construction, and does not need a pneumatic mixer; after uniform manual stirring is performed, the deionized water can be added for adjusting the viscosity for realizing construction; a paint film formed by the finish paint is superior in the environmental weather resistance aspects such as salt-spray corrosion, xenon lamp aging, acid and alkali resistance and heat resistance compared with the existing same type of paint.

Description

technical field [0001] The invention belongs to the technical field of coatings, and in particular relates to a water-based polyurethane high-gloss finish paint for engineering machinery and a preparation method thereof. Background technique [0002] Coatings for construction machinery can be divided into primers and topcoats according to coatings, and solvent-based coatings, electrophoretic coatings and powder coatings according to construction methods. The types of topcoats for construction machinery have been diversified. In addition to traditional solvent-based topcoats, powder coatings have also been used in recent years. Commonly used solvent-based topcoats are alkyd topcoats, epoxy topcoats, acrylic topcoats and polyurethane topcoats. Alkyd resin topcoat is the first topcoat used for construction machinery. The paint film has a slow curing speed, a long drying time, and low hardness of the paint film, but it has high gloss, good elasticity, good fullness and weather ...

AI Technical Summary

Problems solved by technology

[0004] Chinese patent document CN102974520A discloses a coating process for applying water-based coatings to metal parts of construction machinery. The technology enables water-based coatings to be correctly used in the coating of metal parts of construction machinery, which solves the hazards and safety hazards caused by the traditional coating process of forklifts. However, this invention is only suitable for anti-corrosion coating of small mechanical parts. The surface coating of large machinery cannot meet the production needs of the existing coating line

It can be seen that the current water-based anti-corrosion coatings have poor corrosion resistance, initial water resistance and mechanical properties, and the paint film cannot be cured at room temperature, and the construction adaptability is low. Therefore, it cannot be applied to anti-corrosion coatings on the surface of engineering cranes.

[0005] To sum up, at present, in terms of construction of water-based two-component polyurethane topcoat, a pneumatic mixer needs to be equipped on the construction site to fully stir the coating components and curing agent before adding deionized water. The viscosity of the curing agent is relatively high. Difficult to construct, prone to prickly heat, easy to foam at the weld after baking, and poor chemical resistance, high VOC content, so it is difficult to promote on a large scale

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