Water-based paint and preparation method thereof

Abstract

The invention discloses a water-based paint and a preparation method thereof. The water-based paint comprises the following components in percentage by weight: a component A: 20-35% of a water-based epoxy curing agent, 20-30% of deionized water, 0.1-1% of a dispersing agent, 0.1-0.5% of a defoaming agent, 10-25% of titanium dioxide, 3-10% of an anticorrosive pigment, 10-30% of precipitated barium sulphate and 0.5-2% of other auxiliaries; and the component B comprises 100% of water-borne epoxy resin. The water-based anticorrosive paint has the beneficial effects that by strictly controlling the volume concentration of the pigment in the water-based anticorrosive paint and the equivalence ratio of the water-based epoxy curing agent to the water-based epoxy resin, the prepared water-based anticorrosive paint has more excellent salt mist resistance, salt water resistance and good mechanical performance compared with common anticorrosive paint; meanwhile, the water-based anti-corrosion coating has a good mixed service life end point mark, and field construction application is facilitated.

Description

Technical Field

[0001] The invention relates to the technical field of waterborne epoxy anticorrosive coatings, and in particular to a waterborne coating and a preparation method thereof. Background Art

[0002] As people's awareness of environmental protection and safety increases, water-based coatings have become an important direction and research hotspot for coating development. Among water-based anti-corrosion coatings, water-based epoxy anti-corrosion coatings have become the focus of water-based coatings due to their good anti-corrosion properties.

[0003] At present, conventional water-based epoxy coatings have many limitations, such as insufficient long-term resistance to salt spray and salt water. Secondly, during construction, the change in viscosity of conventional water-based epoxy coatings after mixing is different from that of solvent-based two-component epoxy coatings, and there is no obvious end-of-mixing service life mark, which brings difficulties and quality risks to on-site construction. Some water-based epoxy coatings have a very short applicability period despite increased viscosity after mixing, which is not conducive to actual on-site operation. Summary of the invention

[0004] The purpose of the present invention is to provide a water-based coating and a preparation method thereof in order to solve the above-mentioned problems.

[0005] The present invention achieves the above-mentioned purpose through the following technical solutions:

[0006] A water-based paint and a preparation method thereof. The percentage content of each component in the water-based paint is as follows: component A: 20-35% of a water-based epoxy curing agent, 20-30% of deionized water, 0.1-1% of a dispersant, 0.1-0.5% of a defoamer, 10-25% of titanium dioxide, 3-10% of an anticorrosive pigment, 10-30% of precipitated barium sulfate, and 0.5-2% of other additives; component B: 100% of a water-based epoxy resin.

[0007] Furthermore, the percentage of each component in the water-based paint is as follows: component A: 22-30% water-based epoxy curing agent, 22-28% deionized water, 0.2-0.8% dispersant, 0.2-0.4% defoamer, 12-18% titanium dioxide, 5-8% anticorrosive pigment, 15-25% precipitated barium sulfate, and 0.6-1.5% other additives; component B: 100% water-based epoxy resin.

[0008] Furthermore, the percentage content of each component in the preferred water-based coating is as follows: component A: 25-28% water-based epoxy curing agent, 22-28% deionized water, 0.5-0.6% dispersant, 0.2-0.3% defoamer, 15-20% titanium dioxide, 4-6% anticorrosive pigment, 15-20% precipitated barium sulfate, and 0.6-1.2% other additives; component B: 100% water-based epoxy resin.

[0009] Furthermore, the distribution ratio of component A to component B in the water-based coating is 1:1. By strictly controlling the contents of component A and component B, the anti-corrosion performance of the water-based anti-corrosion coating after preparation is better than that of ordinary anti-corrosion coatings.

[0010] Further, the preparation method of the water-based coating is as follows:

[0011] Step 1: Preparation of component A: mix the water-based epoxy curing agent with part of deionized water, defoamer and dispersant evenly, add anticorrosive pigments one by one under stirring, and use water to control the viscosity, then stir the mixture at high speed to meet the fineness requirements, add titanium dioxide, precipitated barium sulfate and other additives under stirring, stir evenly, and filter the mixed material to obtain component A;

[0012] Step 2: Pour component B into the designated container and stir component B evenly in advance;

[0013] Step 3: Add the prepared component A to the stirred component B, and mix the components A and B evenly to complete the preparation of the water-based coating.

[0014] Furthermore, in step 1, each component is used according to the optimal ratio, and the materials are mixed mainly by using a high-speed mixer.

[0015] Furthermore, the purpose of mixing component B in step 2 is to prevent precipitation of component B from affecting the uniformity of the final mixed water-based coating.

[0016] Furthermore, the pigment volume concentration in the water-based coating prepared in step 3 is 30-35%, and the equivalent ratio of the water-based epoxy curing agent to the water-based epoxy resin is 0.9-1. Studies have shown that when the pigment volume concentration in the water-based anti-corrosion coating is 30-35%, the mechanical properties and anti-corrosion effect of the water-based coating are the best; at the same time, when the equivalent ratio of the water-based epoxy curing agent to the water-based epoxy resin is 0.9-1, the water-based anti-corrosion coating has the best salt water resistance, hardness and flexibility.

[0017] Furthermore, the experimental results show that after 1000 hours of salt spray test, there is no blistering, rust or defects in the non-scribe damaged area of ​​the water-based anti-corrosion coating; the average corrosion spread width of the scribe damaged area is 1.2mm, indicating that the water-based epoxy coating has excellent salt spray resistance.

[0018] The beneficial effects of the present invention are:

[0019] The present invention strictly controls the pigment volume concentration and the equivalent ratio of the water-based epoxy curing agent to the water-based epoxy resin in the water-based anti-corrosion coating, so that the prepared water-based anti-corrosion coating has better salt spray resistance, salt water resistance and good mechanical properties than ordinary anti-corrosion coatings. At the same time, the water-based anti-corrosion coating has a good mixed service life end mark, which is beneficial to on-site construction applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The present invention provides a flow chart of a water-based coating and a preparation method thereof. DETAILED DESCRIPTION

[0021] A water-based paint and a preparation method thereof. The percentage content of each component in the water-based paint is as follows: component A: 20-35% of a water-based epoxy curing agent, 20-30% of deionized water, 0.1-1% of a dispersant, 0.1-0.5% of a defoamer, 10-25% of titanium dioxide, 3-10% of an anticorrosive pigment, 10-30% of precipitated barium sulfate, and 0.5-2% of other additives; component B: 100% of a water-based epoxy resin.

[0022] In this embodiment, the percentage of each component in the water-based paint is as follows: component A: 22-30% water-based epoxy curing agent, 22-28% deionized water, 0.2-0.8% dispersant, 0.2-0.4% defoamer, 12-18% titanium dioxide, 5-8% anticorrosive pigment, 15-25% precipitated barium sulfate, and 0.6-1.5% other additives; component B: 100% water-based epoxy resin.

[0023] In this embodiment, the percentage content of each component in the preferred water-based coating is as follows: component A: water-based epoxy curing agent 25-28%, deionized water 22-28%, dispersant 0.5-0.6%, defoamer 0.2-0.3%, titanium dioxide 15-20%, anticorrosive pigment 4-6%, precipitated barium sulfate 15-20%, other additives 0.6-1.2%; component B: water-based epoxy resin 100%.

[0024] In this embodiment, the distribution ratio of component A to component B in the water-based coating is 1:1. By strictly controlling the contents of component A and component B, the anti-corrosion performance of the water-based anti-corrosion coating after preparation is better than that of ordinary anti-corrosion coatings.

[0025] In this embodiment, the preparation method of the water-based coating is as follows:

[0026] Step 1: Preparation of component A: mix the water-based epoxy curing agent with part of deionized water, defoamer and dispersant evenly, add anticorrosive pigments one by one under stirring, and use water to control the viscosity, then stir the mixture at high speed to meet the fineness requirements, add titanium dioxide, precipitated barium sulfate and other additives under stirring, stir evenly, and filter the mixed material to obtain component A;

[0027] Step 2: Pour component B into the designated container and stir component B evenly in advance;

[0028] Step 3: Add the prepared component A to the stirred component B, and mix the components A and B evenly to complete the preparation of the water-based coating.

[0029] In this embodiment, the components in step 1 are used according to the optimal ratio, and the materials are mixed mainly by using a high-speed mixer.

[0030] In this embodiment, the purpose of mixing component B in step 2 is to prevent precipitation of component B from affecting the uniformity of the final mixed water-based coating.

[0031] In this embodiment, the pigment volume concentration in the water-based coating prepared in step 3 is 30-35%, and the equivalent ratio of the water-based epoxy curing agent to the water-based epoxy resin is 0.9-1. Studies have shown that when the pigment volume concentration in the water-based anti-corrosion coating is 30-35%, the mechanical properties and anti-corrosion effect of the water-based coating are the best; at the same time, when the equivalent ratio of the water-based epoxy curing agent to the water-based epoxy resin is 0.9-1, the water-based anti-corrosion coating has the best salt water resistance, hardness and flexibility.

[0032] In this embodiment, the experimental results show that after 1000 hours of salt spray test, the non-line damaged area of ​​the water-based anti-corrosion coating has no blistering, no rust, and no defects; the average corrosion spread width of the line damaged area is 1.2 mm, indicating that the water-based epoxy coating has excellent salt spray resistance.

[0033] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A water-based coating and a preparation method thereof, characterized in that: The percentage content of each component in the water-based paint is as follows: component A: 20-35% water-based epoxy curing agent, 20-30% deionized water, 0.1-1% dispersant, 0.1-0.5% defoamer, 10-25% titanium dioxide, 3-10% anticorrosive pigment, 10-30% precipitated barium sulfate, and 0.5-2% other additives; component B: 100% water-based epoxy resin.

2. A water-based paint and a preparation method thereof according to claim 1, characterized in that: The percentage content of each component in the water-based paint is as follows: component A: 22-30% water-based epoxy curing agent, 22-28% deionized water, 0.2-0.8% dispersant, 0.2-0.4% defoamer, 12-18% titanium dioxide, 5-8% anticorrosive pigment, 15-25% precipitated barium sulfate, and 0.6-1.5% other additives; component B: 100% water-based epoxy resin.

3. A water-based paint and a preparation method thereof according to claim 1, characterized in that: The preferred percentages of the components in the water-based paint are as follows: component A: 25-28% water-based epoxy curing agent, 22-28% deionized water, 0.5-0.6% dispersant, 0.2-0.3% defoamer, 15-20% titanium dioxide, 4-6% anticorrosive pigment, 15-20% precipitated barium sulfate, and 0.6-1.2% other additives; component B: 100% water-based epoxy resin.

4. A water-based paint and a preparation method thereof according to claim 1, characterized in that: The distribution ratio of component A to component B in the water-based paint is 1:

1.

5. A water-based paint and a preparation method thereof according to any one of claims 1 to 4, characterized in that: The preparation method of the water-based coating is as follows: Step 1: Preparation of component A: mix the water-based epoxy curing agent with part of deionized water, defoamer and dispersant evenly, add anticorrosive pigments one by one under stirring, and use water to control the viscosity, then stir the mixture at high speed to meet the fineness requirements, add titanium dioxide, precipitated barium sulfate and other additives under stirring, stir evenly, and filter the mixed material to obtain component A; Step 2: Pour component B into the designated container and stir component B evenly in advance; Step 3: Add the prepared component A to the stirred component B, and mix the components A and B evenly to complete the preparation of the water-based coating.

6. A water-based paint and a preparation method thereof according to claim 5, characterized in that: In step 1, each component is used according to the optimal ratio, and the materials are mixed mainly by using a high-speed mixer.

7. A water-based paint and a preparation method thereof according to claim 5, characterized in that: The purpose of mixing component B in step 2 is to prevent the precipitation of component B from affecting the uniformity of the final mixed water-based coating.

8. A water-based paint and a preparation method thereof according to claim 5, characterized in that: The pigment volume concentration in the water-based paint prepared in step 3 is 30-35%, and the equivalent ratio of the water-based epoxy curing agent to the water-based epoxy resin is 0.9-1.

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