Preparation method and use method of waterborne epoxy primer for automobile aftermarket

Abstract

The invention provides a preparation method and a use method of a waterborne epoxy primer for an automobile aftermarket. The preparation method comprises the following steps: adding powder and a dispersing agent into an epoxy emulsion, and then adding a cosolvent, a wetting agent, an anti-flashing and anti-embroidering agent, a defoaming agent, water and color paste to obtain a component A; anhydride or a mixture of specific fatty amine and water is used as a component B, and the specific fatty amine is water-dispersed or polyether-modified fatty amine; wherein the cosolvents in the component A comprise at least three cosolvents with different boiling points, and the at least three cosolvents with different boiling points have boiling point differences. When being applied to vehicles in the automobile aftermarket, the paint has the characteristics of quick drying, low VOC (Volatile Organic Compounds), high hardness and high adhesive force.

Description

technical field [0001] The invention relates to the technical field of automotive aftermarket coatings, in particular to a preparation method and a using method of a water-based epoxy primer for the automotive aftermarket. Background technique [0002] The requirements for coatings in the automotive aftermarket are different from those of the OEMs, which is caused by the different application scenarios of coatings in the automotive OEMs and the automotive aftermarket. In the automobile OEM, after spraying the paint on the vehicle, it is baked at a temperature above 100 ℃. In the automotive aftermarket, the baking temperature after spraying paint on vehicles should not be too high, otherwise it will cause damage to auto parts. Therefore, baking is generally performed at 55-70 °C. Based on this, coatings applied to auto OEMs cannot be directly applied to the automotive aftermarket, or even if they are directly applied to the automotive aftermarket, the effect will be poor. ...

AI Technical Summary

Problems solved by technology

However, the anti-corrosion epoxy primer used as the bottom layer is generally not taken seriously because of its small amount, simple coating process and low performance requirements.

Compared with oil-based primers, existing water-based epoxy primers have disadvantages such as slow drying speed, easy flash rust on the substrate, low hardness, and poor impact resistance.

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