Zero-VOC (volatile organic compound) water-based emulsion coating applied to container maintenance and preparation method thereof

Abstract

The invention discloses a zero-VOC (volatile organic compound) water-based emulsion coating applied to container maintenance and a preparation method thereof. The coating is prepared from the following components in parts by weight: 50 to 60 parts of water-based hybrid emulsion, 1 to 3 parts of coalescing agent, 0.5 to 1 part of wetting dispersant, 0.2 to 0.4 part of defoaming agent, 0.5 to 1 part of adhesion promoter, 0.3 to 0.5 part of thickening agent, 10 to 20 parts of pigment, 3 to 5 parts of anti-rust pigment, 0.5 to 1 part of corrosion inhibitor, 0.2 to 0.4 part of base material wetting agent and 15 to 26 parts of deionized water. Wherein the water-based hybrid emulsion is a water-based single-component acrylic acid epoxy hybrid emulsion, and the coalescing agent is an alcohol ether compound. Under the condition of zero VOC, high performance of the coating is kept, and the coating has the advantages of being high in drying speed, good in salt spray resistance and weather resistance, free of VOC and the like.

Description

Technical Field

[0001] The invention relates to the field of container coatings, in particular to a zero-VOC water-based emulsion coating used for container maintenance and a preparation method thereof. Background Art

[0002] Containers are large cargo containers with certain strength, rigidity and specifications for turnover. When using containers to transport goods, goods can be loaded directly at the shipper's warehouse and unloaded at the consignee's warehouse. When changing vehicles or ships in the middle of the journey, there is no need to take the goods out of the container and reload them.

[0003] As a supporting product for containers, container coatings must not only meet their functional requirements, but also match the container production level. During operation, containers are often exposed to complex outdoor environments such as strong sunlight, humidity, and seawater, and must withstand collisions and friction during storage and transportation.

[0004] Traditional solvent-based paints are commonly used in the container repair field. This type of product contains more organic solvents and a higher VOC content, which pollutes the environment, wastes energy, and has high costs. In recent years, with the continuous implementation and improvement of environmental protection policies, traditional solvent-based paints are being replaced by more environmentally friendly paints, and container repair manufacturers also need environmentally friendly paints to achieve compliance production. Based on this, the present invention proposes a zero-VOC water-based emulsion paint for container repair. Summary of the invention

[0005] The purpose of the present invention is to provide a zero-VOC water-based emulsion paint for container maintenance and a preparation method thereof, so as to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical scheme: a zero-VOC water-based emulsion coating used for container maintenance, wherein the coating comprises, by weight: 50 to 60 parts of water-based hybrid emulsion, 1 to 3 parts of film-forming aid, 0.5 to 1 part of wetting dispersant, 0.2 to 0.4 parts of defoaming agent, 0.5 to 1 part of adhesion promoter, 0.3 to 0.5 parts of thickener, 10 to 20 parts of pigment, 3 to 5 parts of anti-rust pigment, 0.5 to 1 part of corrosion inhibitor, 0.2 to 0.4 parts of substrate wetting agent, and 15 to 26 parts of deionized water.

[0007] Preferably, the aqueous hybrid emulsion is an aqueous single-component acrylic-epoxy hybrid emulsion.

[0008] Preferably, the film-forming aid is an alcohol ether compound, tripropylene glycol butyl ether, with a boiling point of 276° C., which does not fall within the VOC range.

[0009] Preferably, the wetting and dispersing agent is a comb copolymer of polyether alkanolamine.

[0010] Preferably, the defoaming agent is a polyether siloxane copolymer.

[0011] Preferably, the adhesion promoter is γ-glycidyloxypropyltrimethoxysilane.

[0012] Preferably, the thickener is an associative thickener.

[0013] Preferably, the pigment is titanium dioxide.

[0014] Preferably, the anti-rust pigment is a small-particle zinc phosphate / molybdate composite pigment.

[0015] Preferably, the corrosion inhibitor is an aqueous solution of an organic zinc chelate.

[0016] Preferably, the substrate wetting agent is an organosilicon gemini structure surfactant.

[0017] The present invention also provides a method for preparing the above-mentioned zero-VOC water-based emulsion paint for container maintenance, comprising the following steps:

[0018] First, add deionized water, stir at a low speed, then slowly add a wetting dispersant, a defoamer, a pigment and an anti-rust pigment in sequence, stir at a high speed for 15 minutes and disperse using a grinding device for 15 minutes, then slowly add an aqueous hybrid emulsion, a film-forming aid, an adhesion promoter, a substrate wetting agent, a corrosion inhibitor, deionized water and a thickener in sequence, stir evenly, and obtain a single-component coating;

[0019] The single-component paint can be applied after adding an appropriate amount of water and mixing thoroughly. The VOC content of the applied paint is zero.

[0020] Compared with the prior art, the present invention has the following beneficial effects: the present invention maintains high performance of the coating while maintaining zero VOC, which is specifically manifested in the advantages of fast drying speed, good salt spray resistance and weather resistance, and zero VOC. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] Example 1: A zero-VOC water-based emulsion paint used for container maintenance, wherein the single components are calculated by weight: 50 parts of water-based hybrid emulsion, 2 parts of film-forming aid, 0.7 parts of wetting dispersant, 0.3 parts of defoaming agent, 0.5 parts of adhesion promoter, 0.5 parts of thickener, 15 parts of pigment, 5 parts of rust-proof pigment, 0.5 parts of corrosion inhibitor, 0.2 parts of substrate wetting agent, and 25.3 parts of deionized water.

[0023] The preparation method of the coating of Example 1 is as follows:

[0024] First, add deionized water, stir at a low speed, then slowly add a wetting dispersant, a defoamer, a pigment and an anti-rust pigment in sequence, stir at a high speed for 15 minutes and disperse using a grinding device for 15 minutes, then slowly add an aqueous hybrid emulsion, a film-forming aid, an adhesion promoter, a substrate wetting agent, a corrosion inhibitor, deionized water and a thickener in sequence, stir evenly, and obtain a single-component coating;

[0025] Add appropriate amount of water to the single-component paint and mix thoroughly before construction.

[0026] Example 2: A zero-VOC water-based emulsion paint used for container maintenance, wherein the single components are calculated by weight: 55 parts of water-based hybrid emulsion, 2 parts of film-forming aid, 0.7 parts of wetting dispersant, 0.3 parts of defoaming agent, 0.5 parts of adhesion promoter, 0.4 parts of thickener, 15 parts of pigment, 5 parts of rust-proof pigment, 0.5 parts of corrosion inhibitor, 0.2 parts of substrate wetting agent, and 20.4 parts of deionized water.

[0027] The preparation method of the coating of Example 2 is as follows:

[0028] First, add deionized water, stir at a low speed, then slowly add a wetting dispersant, a defoamer, a pigment and an anti-rust pigment in sequence, stir at a high speed for 15 minutes and disperse using a grinding device for 15 minutes, then slowly add an aqueous hybrid emulsion, a film-forming aid, an adhesion promoter, a substrate wetting agent, a corrosion inhibitor, deionized water and a thickener in sequence, stir evenly, and obtain a single-component coating;

[0029] Add appropriate amount of water to the single-component paint and mix thoroughly before construction.

[0030] Example 3: A zero-VOC water-based emulsion paint used for container maintenance, wherein the single components are calculated by weight: 60 parts of water-based hybrid emulsion, 2 parts of film-forming aid, 0.7 parts of wetting and dispersing agent, 0.3 parts of defoaming agent, 0.5 parts of adhesion promoter, 0.3 parts of thickener, 15 parts of pigment, 5 parts of rust-proof pigment, 0.5 parts of corrosion inhibitor, 0.2 parts of substrate wetting agent, and 15.5 parts of deionized water.

[0031] The preparation method of the coating of Example 3 is as follows:

[0032] First, add deionized water, stir at a low speed, then slowly add a wetting dispersant, a defoamer, a pigment and an anti-rust pigment in sequence, stir at a high speed for 15 minutes and disperse using a grinding device for 15 minutes, then slowly add an aqueous hybrid emulsion, a film-forming aid, an adhesion promoter, a substrate wetting agent, a corrosion inhibitor, deionized water and a thickener in sequence, stir evenly, and obtain a single-component coating;

[0033] Add appropriate amount of water to the single-component paint and mix thoroughly before construction.

[0034] The specific raw material components are shown in Table 1 below:

[0035] Raw material name Example 1 Example 2 Example 3 Water-based hybrid emulsion 50 55 60 Film-forming aids 2 2 2 Wetting and dispersing agents 0.7 0.7 0.7 Defoaming agent 0.3 0.3 0.3 Adhesion promoter 0.5 0.5 0.5 Thickener 0.5 0.4 0.3 pigment 15 15 15 Anti-rust pigment 5 5 5 Corrosion Inhibitors 0.5 0.5 0.5 Substrate wetting agent 0.2 0.2 0.2 Deionized water 25.3 20.4 15.5

[0036] Comparative Example 1: Solvent-based acrylic topcoat commonly used on the market.

[0037] Comparative Example 2: Water-based acrylic exterior paint commonly used on the market.

[0038] In order to better reflect the characteristics of the zero-VOC water-based one-component acrylic epoxy hybrid emulsion coating for container maintenance provided by the embodiments of the present invention, the above-mentioned Examples 1-3 are prepared into paints and Comparative Examples 1-2 are simultaneously tested for relevant coating properties, and the test results are compared.

[0039] Table 2 Repair box exterior paint performance:

[0040]

[0041] It can be seen from the data in Table 2 that the zero-VOC water-based one-component acrylic epoxy hybrid emulsion coatings for container maintenance in Examples 1-3 of the present invention have the advantages of better salt spray resistance and weather resistance, zero VOC, etc. compared with the commercially available solvent-based acrylic coatings and water-based acrylic coatings in Comparative Examples 1-2.

[0042] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. Zero VOC water-based emulsion paint used for container maintenance, characterized by: The single component includes the following ingredients by weight: 50-60 parts of aqueous hybrid emulsion, 1-3 parts of film-forming aid, 0.5-1 part of wetting and dispersing agent, 0.2-0.4 part of defoaming agent, 0.5-1 part of adhesion promoter, 0.3-0.5 part of thickener, 10-20 parts of pigment, 3-5 parts of rust-proof pigment, 0.5-1 part of corrosion inhibitor, 0.2-0.4 part of substrate wetting agent and 15-26 parts of deionized water.

2. The zero-VOC water-based emulsion paint for container maintenance according to claim 1, characterized in that: The aqueous hybrid emulsion is an aqueous single-component acrylic-epoxy hybrid emulsion.

3. The zero-VOC water-based emulsion paint for container maintenance according to claim 1, characterized in that: The film-forming aid is an alcohol ether compound.

4. The zero-VOC water-based emulsion paint for container maintenance according to claim 1, characterized in that: The wetting and dispersing agent is a comb-shaped copolymer of polyether alkanolamine.

5. The zero-VOC water-based emulsion paint for container maintenance according to claim 1, characterized in that: The anti-rust pigment is a small-particle zinc phosphate / molybdate composite pigment.

6. The zero-VOC water-based emulsion paint for container maintenance according to claim 1, characterized in that: The substrate wetting agent is an organosilicon twin structure surfactant.

7. The zero-VOC water-based emulsion paint for container maintenance according to claim 1, characterized in that: The corrosion inhibitor is an aqueous solution of an organic zinc chelate.

8. The zero-VOC water-based emulsion paint for container maintenance according to claim 1, characterized in that: The adhesion promoter is: γ-glycidyloxypropyltrimethoxysilane.

9. The method for preparing a zero-VOC water-based emulsion coating for container maintenance according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1: First, add deionized water, stir at a low speed, then slowly add the wetting dispersant, defoamer, pigment and anti-rust pigment in sequence, stir at a high speed for 15 minutes and disperse using a grinding device for 15 minutes, then slowly add the water-based hybrid emulsion, film-forming aid, adhesion promoter, substrate wetting agent, corrosion inhibitor, deionized water and thickener in sequence, stir evenly, and obtain a single-component coating; S2: Add appropriate amount of water to the single-component paint and mix thoroughly before construction.

10. The method for preparing a zero-VOC water-based emulsion coating for container maintenance according to claim 9, characterized in that: The VOC content of the coating applied in step S2 is zero.

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