A waterborne EAU anticorrosive coating and a preparation method thereof

Abstract

The application belongs to the technical field of building coatings, and particularly relates to a water-based EAU anticorrosive coating and a preparation method thereof. An anticorrosive and antifungal agent, the effective component of the anticorrosive and antifungal agent is composed of OBPA and thyme essential oil, and the mass ratio of the OBPA and the thyme essential oil is 1-7:15-1. The anticorrosive and antifungal agent of the application is composed of OBPA and thyme essential oil, and the combination of the OBPA and the thyme essential oil shows a synergistic effect on various molds, compared with a single effective component, the inhibition effect on molds can be improved, meanwhile, the use amount of the OBPA can be reduced, and the influence on human health can be avoided. In addition, the water-based EAU coating of the application selects the combination of the OBPA and the thyme essential oil as the anticorrosive and antifungal agent, which is helpful to improve the resistance of the water-based EAU coating to external microorganisms, and the water-based EAU coating is immune to the invasion and pollution of the microorganisms, and then the coating production, storage and use are ensured not to produce corruption and deterioration.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of architectural coatings, and particularly relates to a water-based EAU anticorrosive coating and a preparation method thereof. BACKGROUND

[0002] The components such as latex paint, resin emulsion and water-based paint 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, and in this process, the metabolic products such as enzymes and organic acids produced by microorganisms will cause changes in odor, color and viscosity of the coating, resulting in deterioration of the product. Bactericidal and mildew-proof agents can inhibit the growth of microorganisms, and the addition of an appropriate amount of suitable preservative and mildew-proof agent in the product can effectively prevent the invasion of microorganisms.

[0003] Mildew-proof agents can inhibit the growth of microorganisms, and the addition of an appropriate amount of suitable preservative and mildew-proof agent in the product can effectively prevent the invasion of microorganisms. There are many preservatives on the market, such as OBPA, BCM, OIT, IPBC, ZPT and DCOIT, etc. Among them, OBPA, the Chinese name: 10,10-oxobisphenyl pyridine, CAS registration number: 58-36-6, molecular formula: C 24 H 16 O3As2, the structure is:

[0004]

[0005] OBPA is an industrial mildew-proof agent, which can prevent mildew, antibacterial and antialgal at the same time, and is one of the most effective antibacterial agents in the industrial field. It can be added to plastic products, wall coatings, paints, inks and paper, etc. The effect is more excellent than other inorganic or organic antibacterial or mildew-proof agents. Although OBPA has the above advantages, it also has certain disadvantages: with its long-term use, various microorganisms have developed drug resistance to it, resulting in a gradual decrease in its inhibitory effect on various molds. Moreover, OBPA is an arsenic-containing compound, and a large amount of addition will affect human health.

[0006] In the coating industry, different preservative components can be combined and compounded in different proportions, and the combination and compounding of components with synergistic effect can improve the inhibitory effect on mold, reduce the amount and cost. CMIT / MIT+FR is a very common combination and compounding, which has high-efficiency and broad-spectrum bactericidal effect, but not all combinations and compounding of two or more preservative components can achieve the effect of synergistic effect.

[0007] Thyme essential oil is one of the essential oils with antiseptic function, and it is also disclosed in "Evaluation of Small Molecular Phenolic Compounds Bactericidal Activity and Synergistic Effect with Alkaloids, New Alkaloids and Juniperol" (Zhou Rui, Lanzhou University, May 1, 2021, Master's Thesis) that thyme essential oil, oregano essential oil and clove essential oil have inhibitory effect on the growth of Aspergillus flavus mycelium.

[0008] The inventors found through indoor synergistic test that the combination of OBPA and thyme essential oil in a certain mass ratio can improve the inhibitory effect on various molds, thereby improving the resistance of the coating to external microorganisms, preventing the coating from being invaded and contaminated by microorganisms, prolonging the shelf life of the water-based EAU coating, and making the water-based EAU coating have a longer storage time.

[0009] The information disclosed in this BACKGROUND section is only for the purpose of increasing the understanding of the general background of the application, and should not be taken as an acknowledgment or any form of suggestion that this information forms prior art that is known to those of ordinary skill in the art. SUMMARY

[0010] The purpose of the present application is to provide a method for making a building coating, which can improve the resistance of the coating to external microorganisms, prevent the coating from being invaded and contaminated by microorganisms, prolong the shelf life of the water-based EAU coating, and make the water-based EAU coating have a longer storage time.

[0011] To achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0012] The first purpose of the present application is to provide an antiseptic and mold-proof agent, the effective component of which is composed of OBPA and thyme essential oil, and the mass ratio of the OBPA and the thyme essential oil is 1-7:15-1.

[0013] The second purpose of the present application is to provide a water-based EAU antiseptic coating, which comprises the antiseptic and mold-proof agent.

[0014] As a preferred, the water-based EAU antiseptic coating is prepared from the following ingredients by weight parts: water-based EAU acrylic emulsion 55-65 parts, film-forming aid 1-3 parts, antiseptic and mold-proof agent 0.25-0.5 parts, pigment and filler 20-30 parts, thickening agent 0.2-0.6 parts, dispersing agent 0.75-1.0 parts, defoaming agent 0.2-0.4 parts and deionized water 15-20 parts.

[0015] As a preferred, the film-forming aid is alcohol fat twelve.

[0016] As a preferred, the pigment and filler is selected from one or more of titanium dioxide, mica powder and aluminum phosphate.

[0017] As a preferred, the thickening agent is a polyurethane thickening agent.

[0018] As preferred, the dispersant is a non-ionic dispersant or an anionic sodium salt dispersant.

[0019] As preferred, the defoaming agent is a silicone defoaming agent or a mineral oil defoaming agent.

[0020] A third object of the present application is to provide a preparation method of the water-based EAU anticorrosive paint, comprising the following steps:

[0021] S1. The dispersant and the defoaming agent are added to deionized water, stirred and dispersed at a speed of 400-450 rpm for 5-10 min, then the pigments and fillers are added while stirring, and then stirred and dispersed at a speed of 800-1000 rpm for 20-25 min to obtain a dispersion liquid;

[0022] S2. The dispersion liquid is ground in a grinding machine to make the fineness of the dispersion liquid less than 30 μm to obtain a paint semi-product;

[0023] S3. The water-based EAU acrylic emulsion, the film-forming aid, the anticorrosive and antifungal agent, and the thickening agent are added to the paint semi-product obtained in S2, and stirred and mixed at a speed of 400-450 rpm for 8-10 min to obtain the water-based EAU anticorrosive paint.

[0024] Compared with the prior art, the present application has the following beneficial effects:

[0025] (1) The anticorrosive and antifungal agent of the present application is composed of OBPA and thyme essential oil, and the combination of OBPA and thyme essential oil shows a synergistic effect on various molds, can improve the inhibition effect on molds compared with a single effective component, and can also reduce the use amount of OBPA to avoid affecting human health.

[0026] (2) The water-based EAU paint of the present application selects the combination of OBPA and thyme essential oil as the anticorrosive and antifungal agent, which helps to improve the resistance of the water-based EAU paint to external microorganisms, prevents the paint from being damaged and contaminated by microorganisms, and further ensures that the paint does not deteriorate during production, storage, and use. DETAILED DESCRIPTION

[0027] The following clearly and completely describes the technical solutions of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments.

[0028] In the following examples, the water-based EAU acrylic emulsion is purchased from Shanghai Aladdin Biochemical Technology Co., Ltd.

[0029] The polyurethane thickening agent is purchased from Guangzhou Huixiang Chemical Co., Ltd. (RW-8W).

[0030] Example 1

[0031] An aqueous EAU anticorrosive paint is prepared from the following components: 65 kg of aqueous EAU acrylic emulsion, 2 kg of ICI alcohol ester, 0.4 kg of anticorrosive and mildewproof agent, 25 kg of titanium dioxide as pigment and filler, 0.5 kg of polyurethane thickening agent, 0.75 kg of sodium lignosulfonate dispersant, 0.3 kg of Nopco NXZ defoaming agent, and 20 kg of deionized water; wherein the anticorrosive and mildewproof agent is composed of OBPA and thyme essential oil, and the mass ratio of OBPA to thyme essential oil is 5:1.

[0032] The preparation method of the above-mentioned aqueous EAU anticorrosive paint comprises the following steps:

[0033] S1. Add the dispersant and defoaming agent to the deionized water, stir and disperse at a speed of 450 rpm for 10 min, then add the pigment while stirring, and then stir and disperse at a speed of 1000 rpm for 25 min to obtain a dispersion liquid;

[0034] S2. Grind the dispersion liquid in a grinder to make the fineness of the dispersion liquid less than 30 μm to obtain a paint semi-product;

[0035] S3. Add the aqueous EAU acrylic emulsion, film-forming aid, anticorrosive and mildewproof agent, and thickening agent to the paint semi-product, and stir and mix at a speed of 450 rpm for 10 min to obtain the aqueous EAU anticorrosive paint.

[0036] Example 2 : OBPA and thyme essential oil synergistic test

[0037] 1. Test fungi: Aspergillus flavus, Paecilomyces variotii, Trichoderma viride, and Cladosporium herbarum, preserved on PDA medium for standby use.

[0038] 2. Test agents: 99% OBPA (Hubei Chushuo Biological Technology Co., Ltd.) and 99% thyme essential oil (Jiangxi Youshang Herbal Spice Co., Ltd.), first dissolved in DMSO, then diluted with 0.1% Tween-80 aqueous solution to prepare single-agent stock solutions, set multiple groups of ratios, and then diluted with 0.1% Tween-80 aqueous solution according to the equal ratio method to prepare 6 concentration gradients for standby use.

[0039] 3. Test method: mycelial growth rate method (Mou Liyi 1994)

[0040] 1 mL of the test agent was mixed with 9 mL of melted PDA medium, and poured into a sterile culture dish to make a drug-containing plate. After the medium solidified, 1 mycelium cake (5 mm in diameter) was placed in the center of the drug-containing plate, and 0.1% Tween-80 aqueous solution was used as a control, and 3 replicates were set for each treatment. After being placed in an incubator and cultured at 28±1°C for 3 days, the diameters of the mycelium colonies were measured by the cross method, and the inhibition rate was calculated.

[0041]

[0042] 4. Data analysis

[0043] The logarithmic values of the test agent concentrations and the probability values of the mycelium growth inhibition rates were subjected to regression analysis by using the DPS software, and the EC 50 values of the agents in each treatment were calculated, and the synergistic effect was evaluated according to the Wadlley method.

[0044] SR≥1.5 indicates a synergistic effect; SR≤0.5 indicates an antagonistic effect; 0.5

[0045] Table 1 Toxicity of OBPA (A) and thyme essential oil (B) to Aspergillus flavus

[0046]

[0047] As can be seen from Table 1, the synergistic coefficients of OBPA and thyme essential oil to Aspergillus flavus are all greater than 1.5 in the mass ratio of 1-7:15-1, showing a synergistic effect.

[0048] Table 2 Toxicity of OBPA (A) and thyme essential oil (B) to Paecilomyces variotii

[0049]

[0050] As can be seen from Table 2, the synergistic coefficients of OBPA and thyme essential oil to Paecilomyces variotii are all greater than 1.5 in the mass ratio of 1-7:15-1, showing a synergistic effect.

[0051] Table 3 Toxicity of OBPA (A) and thyme essential oil (B) to Trichoderma viride

[0052]

[0053] As can be seen from Table 3, the synergistic coefficients of OBPA and thyme essential oil to Trichoderma viride are all greater than 1.5 in the mass ratio of 1-7:15-1, showing synergistic effect.

[0054] Table 4 Toxicity of the combination of OBPA (A) and thyme essential oil (B) to Cladosporium herbarum

[0055]

[0056] As can be seen from Table 4, the synergistic coefficients of OBPA and thyme essential oil to Cladosporium herbarum are all greater than 1.5 in the mass ratio of 1-7:15-1, showing synergistic effect.

[0057] In summary, the combination of OBPA and thyme essential oil shows synergistic effect to Aspergillus flavus, Paecilomyces variotii, Trichoderma viride and Cladosporium herbarum and other molds, and compared with single effective component, can improve the inhibition effect on molds, and at the same time, can reduce the use amount of OBPA, avoiding the influence on human health.

[0058] The foregoing description of specific exemplary embodiments of the application is intended to be illustrative only and is not intended to limit the scope of the application in any way. Many variations and changes can be made by those skilled in the art without departing from the spirit and scope of the application. The examples described are chosen and described in order to explain the principles of the application and its practical application and to enable others skilled in the art to best utilize the application. It is intended that the scope of the application be defined by the claims appended hereto and their equivalents.

Claims

1. A preservative and antifungal agent, wherein the preservative and antifungal agent is used to inhibit the growth of Aspergillus flavus, Paecilomyces wannii, Trichoderma viride, and Trichoderma buddingii, characterized in that, The active ingredients of the preservative and antifungal agent consist of OBPA and thyme essential oil, and the mass ratio of OBPA to thyme essential oil is 1-7:15-1.

2. A water-based EAU anti-corrosion coating, characterized in that, Includes the preservative and antifungal agent as described in claim 1.

3. The water-based EAU anti-corrosion coating according to claim 2, characterized in that, By weight, the waterborne EAU anti-corrosion coating is prepared from the following components: 55-65 parts waterborne EAU acrylic emulsion, 1-3 parts film-forming aid, 0.25-0.5 parts anti-corrosion and anti-mildew agent, 20-30 parts pigments and fillers, 0.2-0.6 parts thickener, 0.75-1.0 parts dispersant, 0.2-0.4 parts defoamer, and 15-20 parts deionized water.

4. The water-based EAU anti-corrosion coating according to claim 3, characterized in that, The film-forming aid is 12-ol ester.

5. The water-based EAU anti-corrosion coating according to claim 3, characterized in that, The pigments and fillers are selected from one or more of titanium dioxide, mica powder, and aluminum phosphate.

6. The water-based EAU anti-corrosion coating according to claim 3, characterized in that, The thickener is a polyurethane thickener.

7. The water-based EAU anti-corrosion coating according to claim 3, characterized in that, The dispersant is a nonionic dispersant or an anionic sodium salt dispersant.

8. The water-based EAU anti-corrosion coating according to claim 3, characterized in that, The defoamer is an organosilicon defoamer or a mineral oil defoamer.

9. A method for preparing the waterborne EAU anticorrosive coating according to any one of claims 3-8, characterized in that, Includes the following steps: S1. Add the dispersant and defoamer to deionized water, stir and disperse at 400-450 rpm for 5-10 min, then add pigments and fillers while stirring, and then stir and disperse at 800-1000 rpm for 20-25 min to obtain a dispersion. S2. Add the dispersion to a grinder and grind it until the fineness of the dispersion is less than 30μm to obtain a semi-finished coating product; S3. Add the water-based EAU acrylic emulsion, film-forming aid, anti-corrosion and anti-mildew agent and thickener to the coating semi-finished product obtained in S2, and stir and mix at 400-450 rpm for 8-10 minutes to obtain the water-based EAU anti-corrosion coating.

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