Single-component water-based black paint for automobile and preparation method thereof

Abstract

The invention relates to single-component water-based black paint for an automobile and a preparation method thereof. The single-component water-based black paint for the automobile is prepared by mixing three components A, B and C according to the weight ratio of 4 to (4 to 7) to (0.05 to 0.2), wherein the component A is prepared from the following components in parts by weight: 3 to 7.5 parts ofhigh-pigment carbon black, 15 to 35 parts of water, 3 to 10 parts of methyl ethylene glycol, 0.3 to 2.5 parts of base material wetting agent and 1.5 to 7.5 percent of dispersant; the component B is an aliphatic polyurethane dispersion body; the component C is a rheological agent. According to the single-component water-based black paint for the automobile, the compatibility problem of raw materials is remarkably improved, and the flowability, storage stability, luster, blackness and a blue phase are improved.

Description

technical field [0001] The invention belongs to the technical field of coatings, and in particular relates to a single-component water-based black paint for automobiles and a preparation method thereof. Background technique [0002] Paint, formerly known as paint, refers to a substance that can be applied to the surface of an object, firmly combined with the volume, and forms a solid film with a certain strength. The coating of an automobile body is a multi-layer system, usually including an electrophoretic deposition primer layer, a middle paint layer, Topcoat layer, etc. The topcoat, as the last layer of coating, must have several functions: 1. Good appearance: including high fullness, high gloss, good leveling, no shrinkage cavity, no prickly heat, etc.; 2. Excellent protection performance: including good hardness, good flexibility, good weather resistance, good water resistance, good salt spray resistance, etc.; 3. Excellent construction: including good wettability, not ...

AI Technical Summary

Problems solved by technology

[0004] Patent document CN104312399B discloses a high-blackness blue-phase black topcoat and its preparation method. The high-blackness blue-phase black topcoat is compounded with hydroxyl acrylic resin, hydroxyl polyester resin and various additives. Excellent performance, good leveling, good weather resistance, good hardness, and good scratch resistance; patent document CN106800874A discloses a water-based two-component polyurethane topcoat and its preparation method, but the curing agent in the topcoat Contains both hydrophilic and hydrophobic polyisocyanate curing agents, and the content of water-based hydroxyl acrylic dispersion in component A is high, and the acid and alkali resistance of the product is unbalanced

[0005] The general water-based one-component black paint on the market is generally resistant to water at 40°C for 3-5 days and then wrinkles and delaminates obviously. After being stored at 40°C for 1-3 days, water will be separated obviously, and at the same time, it will be condensed after being placed at 0°C for 1-3 days. , loss of liquidity, and insufficient blackness and blue phase, unable to meet the needs of the high-end market

The reason for this problem is that an important problem in the process of preparing water-based paint is how to make the oil-soluble polymer soluble in water. The solutions mainly include salt-forming method, alcoholysis method, and the method of introducing non-ionic hydrophilic groups. etc. Through the above methods, its defects can be improved, but it is often difficult to give full consideration to properties such as paint film compactness, raw material miscibility, and fluidity.

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