A kind of water-based epoxy acrylic anticorrosive coating and preparation method thereof

Abstract

The present invention belongs to the technical field of anticorrosive coatings, and specifically relates to a water-based epoxy acrylic anticorrosive coating and a preparation method thereof. A preservative, wherein the preservative active ingredient is compounded with jinggangmycin and zinc pyrithione, and the mass ratio of the jinggangmycin to zinc pyrithione is 1-25:3-1. When the jinggangmycin and zinc pyrithione in the active ingredients of the antifungal agent of the present invention are combined and compounded in a certain mass ratio, the inhibitory effect on various molds can be improved, thereby effectively preventing the invasion of microorganisms and ensuring that the coating does not spoil during production, storage and use.

Description

Technical Field

[0001] The invention belongs to the technical field of anti-corrosion coatings, and particularly relates to a water-based epoxy acrylic anti-corrosion coating and a preparation method thereof. Background Art

[0002] Anticorrosive coatings contain organic substances, which provide basic conditions for the growth and reproduction of microorganisms. Under suitable conditions, the growth and reproduction of microorganisms will be promoted. During this process, the metabolites such as enzymes and organic acids produced by microorganisms will cause changes in the smell, color and viscosity of the coating, causing the product to deteriorate. Preservatives can inhibit the growth of microorganisms. Adding an appropriate amount of preservatives to the product can effectively prevent the invasion of microorganisms and ensure that the coating will not deteriorate during production and storage.

[0003] Zinc pyrithione is one of the commonly used mildew preventers. It is not only used as mildew and algae preventer, but also used in shampoo and cosmetics in the world. It can remove dandruff in shampoo. In actual use, zinc pyrithione can be used for dry film mildew prevention and dry film algae prevention. However, with the long-term use of a single active ingredient of preservatives, many microorganisms have developed resistance to it, resulting in a gradual reduction in its inhibitory effect on various molds.

[0004] Different antiseptic components can be combined and compounded in different proportions. Those with synergistic effects can improve the inhibitory effect on mold, reduce dosage and reduce costs. CMIT / MIT+FR is a very commonly used combination compound, which has a high-efficiency and broad-spectrum bactericidal effect, but not any combination of two or more antiseptic components can achieve a synergistic effect.

[0005] The inventors found through indoor synergistic tests that the combination of Jinggangmycin and zinc pyrithione in a certain mass ratio can improve the inhibitory effect on a variety of molds, thereby effectively preventing microbial invasion and ensuring that the paint does not spoil during production and storage.

[0006] The information disclosed in this background technology section is only intended to enhance the understanding of the overall background of the invention and should not be regarded as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art. Summary of the invention

[0007] The object of the present invention is to provide a water-based epoxy acrylic anticorrosive coating and a preparation method thereof, wherein the active ingredients of the antifungal agent, namely, jinggangmycin and zinc pyrithione, when combined and compounded in a certain mass ratio, can improve the inhibitory effect on various molds, thereby effectively preventing the invasion of microorganisms and ensuring that the coating does not spoil during the production and storage process.

[0008] To achieve the above object, the present invention provides the following technical solutions:

[0009] The first object of the present invention is to provide a preservative, wherein the effective ingredients of the preservative are compounded with validamycin and zinc pyrithione, and the mass ratio of validamycin to zinc pyrithione is 1-25:3-1.

[0010] The second object of the present invention is to provide the use of the preservative in the preparation of coatings.

[0011] The third object of the present invention is to provide a water-based epoxy acrylic anti-corrosion coating, which is prepared from the following ingredients by weight: 60-100 parts of water-based epoxy acrylic emulsion, 8-12 parts of film-forming aid, 0.75-2 parts of the mildew inhibitor, 10-14 parts of filler, 0-25 parts of pigment, 0.5-1 parts of thickener, 0.75-1.5 parts of dispersant, 0.3-0.7 parts of defoaming agent and 20-30 parts of deionized water.

[0012] Preferably, the film-forming aid is selected from one or more of dipropylene glycol methyl ether, ethylene glycol butyl ether and alcohol ester dodecahydrate.

[0013] Preferably, the filler is selected from one or more of titanium dioxide, precipitated barium sulfate, aluminum phosphate and mica powder.

[0014] Preferably, the pigment is titanium dioxide, zinc oxide, quartz powder or calcium carbonate.

[0015] Preferably, the thickener is HEC hydroxyethyl cellulose or an associative thickener.

[0016] Preferably, the dispersant is selected from one or more of sodium lignin sulfonate, sodium eicosyl sulfate and Tween-80.

[0017] Preferably, the defoamer is NXZ defoamer.

[0018] The fourth object of the present invention is to provide a method for preparing the waterborne epoxy acrylic anticorrosive coating, comprising the following steps:

[0019] S1. Add the water-based epoxy acrylic emulsion, filler, pigment and deionized water into the container and stir to mix evenly;

[0020] S2. The mixture was added to a grinder and ground through a 150-200 mesh sieve to remove solid impurities in the mixture to obtain a semi-finished coating;

[0021] S3. Add a film-forming aid, a mildew preventer, a thickener, a dispersant and a defoaming agent to the semi-finished coating obtained in S2, mix and stir to obtain a water-based epoxy acrylic anti-corrosion coating.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] (1) The active ingredients of the preservative of the present invention are prepared by combining Jinggangmycin and pyrithione zinc in a certain mass ratio, which can improve the inhibitory effect on various molds, thereby effectively preventing the invasion of microorganisms, and helping to ensure that the coating does not spoil during production, storage and use.

[0024] (2) The water-based epoxy acrylic anticorrosive coating of the present invention uses a combination of Jinggangmycin and zinc pyrithione as a mildew inhibitor, which helps to ensure that the coating does not spoil during production, storage and use. DETAILED DESCRIPTION

[0025] The following is a clear and complete description of the technical solution of the present invention. Obviously, the described embodiments are 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 technicians in this field without creative work are within the scope of protection of the present invention.

[0026] In the following examples, water-based epoxy acrylic emulsion was purchased from Green Union (Jining) Chemical Technology Co., Ltd.

[0027] Example 1 :Effective test of Jinggangmycin and pyrithione zinc

[0028] 1. Test mold

[0029] Cladosporium herbarum

[0030] Aspergillus versicolor

[0031] Penicillium purpurogenum

[0032] Store in PDA medium for later use.

[0033] 2. Test Agents

[0034] 99% Jinggangmycin technical (Wuhan Runze Weiye Technology Co., Ltd.)

[0035] 98% Zinc Pyrithione Technical (Henan Weitixi Chemical Technology Co., Ltd.)

[0036] 3. Dissolve the Jinggangmycin original drug with sterile water and the pyrithione zinc original drug with dimethyl sulfoxide, and then use 0.1% Tween-80 aqueous solution to prepare the dissolved original drugs into single-dose mother liquors, set up multiple groups of proportions, and dilute each single dose and each group of proportions with 0.1% Tween-80 aqueous solution in an isotropic method into 5 mass concentration gradients for standby use.

[0037] 4. Test method: Mycelium growth rate method (Mu Liyi 1994)

[0038] Mix 1 mL of the test agent with 9 mL of melted PDA medium and pour into a sterile culture dish to make a drug-containing plate. After the medium solidifies, place a mold cake (5 mm in diameter) in the center of the drug-containing plate, and use 0.1% Tween-80 aqueous solution as a control. Set up 3 replicates for each treatment. Place in an incubator and culture at 28±1℃ for 3 days. Measure the diameter of the mold colony growth using the cross method and calculate the inhibition rate.

[0039]

[0040] 5. Data Analysis

[0041] DPS software was used to perform regression analysis on the logarithmic value of the test agent concentration and the probability value of mycelium growth inhibition rate to calculate the EC of each treatment agent. 50 , and the co-toxicity coefficient (CTC value) of the mixture was calculated according to Sun Yunpei's method.

[0042] The synergistic effect of mixed drugs was evaluated according to the co-toxicity coefficient (CTC), that is, CTC≤80 was antagonistic, 80<CTC<120 was additive, and CTC≥120 was synergistic. The experimental results are shown in Table 1-3.

[0043] Table 1 Toxicity of the combination of Jinggangmycin (A) and zinc pyrithione (B) to Cladosporium waxleaf

[0044]

[0045] As can be seen from Table 1, the mass ratio of Jinggangmycin to zinc pyrithione in the range of 1-25:3-1 showed a synergistic effect on Cladosporium waxleaf.

[0046] Table 2 Toxicity of the combination of Jinggangmycin (A) and pyrithione zinc (B) to Aspergillus versicolor

[0047]

[0048] As can be seen from Table 2, the mass ratio of Jinggangmycin to pyrithione zinc showed a synergistic effect on Aspergillus versicolor in the range of 1-10:3-1, and showed an additive effect on Aspergillus versicolor in the range of 20-25:1.

[0049] Table 3 Toxicity of the combination of Jinggangmycin (A) and pyrithione zinc (B) to purple-producing Penicillium

[0050]

[0051] As can be seen from Table 3, the mass ratio of Jinggangmycin to pyrithione zinc in the range of 1-25:3-1 showed a synergistic effect on Penicillium purpurogenum.

[0052] In summary, the combination of Jinggangmycin and zinc pyrithione shows a synergistic effect on various molds such as Cladosporium waxleaf, Aspergillus colorimetricum and Penicillium purpurogenum, which can improve the inhibitory effect on various molds, and thus can effectively prevent the invasion of microorganisms and ensure that the coating does not spoil during production, storage and use.

[0053] Example 2

[0054] A water-based epoxy acrylic anticorrosive coating is prepared from the following ingredients: 60-100 kg of water-based epoxy acrylic emulsion, 12 kg of film-forming aid alcohol ester twelve, 0.8 kg of mildew preventer, 12 kg of filler calcium carbonate, 15 kg of pigment titanium dioxide, 0.6 kg of thickener HEC hydroxyethyl cellulose, 1.2 kg of dispersant sodium lignin sulfonate, 0.5 kg of NXZ defoamer and 30 kg of deionized water.

[0055] The preparation method of the water-based epoxy acrylic anticorrosive coating comprises the following steps:

[0056] S1. Add the water-based epoxy acrylic emulsion, filler, pigment and deionized water into the container and stir to mix evenly;

[0057] S2. The mixture was added to a grinder and ground through a 150-mesh sieve to remove solid impurities in the mixture to obtain a semi-finished coating;

[0058] S3. Add a film-forming aid, a mildew preventer, a thickener, a dispersant and a defoaming agent to the semi-finished coating obtained in S2, mix and stir to obtain a water-based epoxy acrylic anti-corrosion coating.

[0059] The foregoing description of specific exemplary embodiments of the present invention is for the purpose of illustration and demonstration. These descriptions are not intended to limit the present invention to the precise form disclosed, and it is clear that many changes and variations can be made based on the above teachings. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the present invention and its practical application, so that those skilled in the art can realize and utilize various different exemplary embodiments of the present invention and various different selections and changes. The scope of the present invention is intended to be limited by the claims and their equivalents.

Claims

1. A preservative, characterized in that The effective component of the preservative is prepared by compounding validamycin and zinc pyrithione, and the mass ratio of the validamycin to zinc pyrithione is 1-25:3-1.

2. Use of the preservative according to claim 1 in the preparation of coatings.

3. A water-based epoxy acrylic anticorrosive coating, characterized in that: The water-based epoxy acrylic anti-corrosion coating is prepared from the following ingredients in parts by weight: 60-100 parts of water-based epoxy acrylic emulsion, 8-12 parts of film-forming aid, 0.75-2 parts of the preservative according to claim 1, 10-14 parts of filler, 0-25 parts of pigment, 0.5-1 part of thickener, 0.75-1.5 parts of dispersant, 0.3-0.7 parts of defoamer and 20-30 parts of deionized water.

4. The water-based epoxy acrylic anticorrosive coating according to claim 3, characterized in that: The film-forming aid is selected from one or more of dipropylene glycol methyl ether, ethylene glycol butyl ether and alcohol ester dodecahydrate.

5. The water-based epoxy acrylic anticorrosive coating according to claim 3, characterized in that: The filler is selected from one or more of titanium dioxide, precipitated barium sulfate, aluminum phosphate and mica powder.

6. The water-based epoxy acrylic anticorrosive coating according to claim 3, characterized in that: The pigment is titanium dioxide, zinc oxide, quartz powder or calcium carbonate.

7. The water-based epoxy acrylic anticorrosive coating according to claim 3, characterized in that: The thickener is HEC hydroxyethyl cellulose or an associative thickener.

8. The water-based epoxy acrylic anticorrosive coating according to claim 3, characterized in that: The dispersant is selected from one or more of sodium lignin sulfonate, sodium eicosyl sulfate and Tween-80.

9. The water-based epoxy acrylic anticorrosive coating according to claim 3, characterized in that: The defoamer is NXZ defoamer.

10. The method for preparing the waterborne epoxy acrylic anticorrosive coating according to any one of claims 3 to 9, characterized in that: The following steps are involved: S1. Add the water-based epoxy acrylic emulsion, filler, pigment and deionized water into the container and stir to mix evenly; S2. The mixture was added to a grinder and ground through a 150-200 mesh sieve to remove solid impurities in the mixture to obtain a semi-finished coating; S3. Add a film-forming aid, a preservative, a thickener, a dispersant and a defoaming agent to the semi-finished coating obtained in S2, mix and stir to obtain a water-based epoxy acrylic anti-corrosion coating.

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