Water-based anticorrosive paint for color steel tile roof renovation and preparation method of water-based anticorrosive paint

Abstract

The invention provides a water-based anticorrosive paint for color steel tile roof renovation, which is characterized by comprising the following components in parts by mass: 60-80 parts of base paint and 16-24 parts of high-reflection additive filler, the high-reflection additive filler is prepared by the following steps: S1, crushing mixed aluminum powder and titanium dioxide, and uniformly dispersing the crushed mixed aluminum powder and titanium dioxide into a dispersing agent to obtain a mixture A; s2, sequentially adding a grinding aid and triethanolamine into the mixture A, and stirring at 25-28 DEG C for 1-3 hours to obtain the high-reflection additive filler. According to the water-based anticorrosive paint for color steel tile roof renovation, the high-reflection additive filler is introduced, and the mixed aluminum powder and titanium dioxide used in the preparation process of the high-reflection additive filler both have high refractivity and high light activity and can effectively absorb, reflect and scatter ultraviolet rays. The reflection effects of the mixed aluminum powder and the titanium dioxide are mutually superposed, so that the coating has higher reflectivity, the temperature of the surface of an object is more effectively reduced, and heat transfer to the interior of the object is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of anti-corrosion coating preparation, and in particular to a water-based anti-corrosion coating for renovation of color steel tile roofs and a preparation method thereof. Background Art

[0002] Water-based anti-corrosion paint is an environmentally friendly paint that uses water as a solvent or dispersion medium. It is non-toxic, odorless, non-flammable and non-explosive, and has high safety during storage, transportation and construction.

[0003] Color steel tiles are a lightweight, high-strength building material that is widely used in roofs and walls of industrial plants, warehouses, houses and other buildings. However, with the increase in years of use, the surface of color steel tiles is prone to rust and aging. The existing maintenance method is mostly renovation through water-based anti-corrosion paint, but the reflective performance of traditional water-based anti-corrosion paint is general and cannot effectively reflect sunlight, resulting in high indoor room temperature of color steel tile houses in hot weather. Therefore, there is an urgent need for a water-based anti-corrosion paint for renovation of color steel tile roofs. Summary of the invention

[0004] In view of the above-mentioned deficiencies in the prior art, the present invention provides a water-based anti-corrosion coating for renovation of color steel tile roofs and a preparation method thereof.

[0005] According to one aspect of the present invention, a water-based anti-corrosion coating for renovation of color steel tile roofs is provided.

[0006] A water-based anticorrosive paint for renovation of color steel tile roofs, comprising the following components in parts by weight: 60 to 80 parts of base paint, 16 to 24 parts of high-reflective additive filler;

[0007] Highly reflective additive fillers are prepared by the following steps:

[0008] S1. The mixed aluminum powder and titanium dioxide are crushed and evenly dispersed in a dispersant to obtain a mixture A;

[0009] S2. Add a grinding aid and triethanolamine to mixture A in sequence, stir at 25-28° C. for 1-3 hours to obtain a highly reflective added filler.

[0010] Preferably, in the high-reflective additive filler preparation step S1, the mass ratio of the mixed aluminum powder to titanium dioxide is (3-5): (1-3).

[0011] Preferably, in the high-reflective additive filler preparation step S1, the mixture uniformly dispersed in the dispersant is stirred at a speed of 200 to 300 rpm for 0.5 to 0.7 h.

[0012] Preferably, the particle size of the mixed aluminum powder is 400-500 mesh.

[0013] Preferably, the particle size of titanium dioxide is 300-400 mesh.

[0014] Preferably, in the high-reflective additive filler preparation step S2, the mass ratio of the grinding aid to triethanolamine is (2-4): (0.5-0.7).

[0015] Preferably, in the high-reflective additive filler preparation step S2, the stirring speed is 300-400 rpm.

[0016] The water-based anticorrosive coating for renovation of color steel tile roofs provided by the present invention introduces a high-reflective additive filler. The mixed aluminum powder and titanium dioxide used in the preparation process of the high-reflective additive filler have high refractive index and high photoactivity, and can effectively absorb, reflect and scatter ultraviolet rays. The reflective effects of the mixed aluminum powder and titanium dioxide are superimposed on each other, so that the coating has a higher reflectivity, thereby more effectively reducing the temperature of the surface of the object and reducing the transfer of heat to the inside of the object. In addition, the triethanolamine used in the preparation process of the high-reflective additive filler has good water solubility, and this water-soluble oily agent can form a physical adsorption film during the preparation process, which plays a lubricating role under a relatively low load. In the high-reflective additive filler containing mixed aluminum powder and titanium dioxide, this lubricating effect helps to reduce the friction between the mixed aluminum powder and titanium dioxide, improve the dispersibility and uniformity of the coating, and thus effectively improve the overall reflectivity of the coating.

[0017] Preferably, the mass ratio of the base paint to the high-reflective added filler is 5:(1-2).

[0018] Preferably, calculated by weight, the raw materials used to prepare the base paint include 70 parts of epoxy resin, 1 to 3 parts of film-forming aid, 3 to 5 parts of inorganic pigment, and 0.3 to 0.5 parts of dispersant.

[0019] Preferably, the epoxy resin is a waterborne epoxy resin.

[0020] The water-based anti-corrosion coating for renovation of color steel tile roofs provided by the present invention uses water-based epoxy resin as a resin matrix. The water-based epoxy resin and a film-forming aid undergo a chemical cross-linking reaction at room temperature, so that the epoxy resin is cured into an insoluble spatial network structure. The cured resin coating has a dense molecular structure and can effectively block the penetration of corrosive substances.

[0021] Preferably, the component further comprises 16 to 30 parts of additives by mass.

[0022] Preferably, calculated by weight, the raw materials used to prepare the additive include 20 to 30 parts of a dispersant, 10 to 20 parts of a defoamer, 5 to 10 parts of a leveling agent, and 5 to 10 parts of a thickener.

[0023] According to another aspect of the present invention, there is provided a method for preparing a water-based anti-corrosion coating for renovation of a color steel tile roof, comprising the following steps:

[0024] S1. Preparation of additives;

[0025] S2. preparing a base paint, the base paint containing the fatty acid resin, the film-forming aid, the inorganic pigment and the dispersant;

[0026] S3. Mixing the additives in step S1 and the base paint in step S2, heating to 20 to 24° C. to obtain a mixture B;

[0027] S4. Add the high-reflective filler into the mixture B in step S3 in multiple times, stir for 0.5 to 0.8 hours, add a thickener, and obtain a water-based anti-corrosion coating for color steel tile roof renovation.

[0028] Preferably, the stirring speed of preparing the additive in step S1 is 1500-1700 rpm, and the stirring time is 2-3 hours.

[0029] Preferably, the stirring speed of preparing the base paint in step S2 is 300-500 rpm. DETAILED DESCRIPTION

[0030] The following is a further clear and complete description of the technical features in the technical solution provided by the present invention in conjunction with the specific implementation methods. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0031] Example 1

[0032] Highly reflective additive fillers are prepared by the following steps:

[0033] S1. The mixed aluminum powder and titanium dioxide are crushed and evenly dispersed in a dispersant to obtain a mixture A;

[0034] S2. The grinding aid and triethanolamine were sequentially added to the mixture A and stirred at 25 ° C for 1 hour to obtain a highly reflective filler;

[0035] Among them, the mass ratio of mixed aluminum powder to titanium dioxide is 3:1;

[0036] Wherein, the particle size of the mixed aluminum powder is 400 mesh;

[0037] Wherein, the particle size of titanium dioxide is 300 mesh;

[0038] Among them, the mass ratio of the grinding aid to triethanolamine is 2:0.5.

[0039] A water-based anti-corrosion coating for renovation of color steel tile roofs, the coating being prepared by the following steps: 16 parts by weight of an additive and 60 parts by weight of a base paint are mixed, heated to 20° C. to obtain a mixture B, and then 16 parts by weight of a high-reflection additive filler are added to the mixture B in multiple portions, stirred for 0.5 hours, and a thickener is added to obtain a water-based anti-corrosion coating for renovation of color steel tile roofs;

[0040] The additive is prepared by mixing 20 parts by mass of a dispersant, 10 parts by mass of a defoamer, 5 parts by mass of a leveling agent, and 5 parts by mass of a thickener under stirring at a stirring speed of 1500 rpm for 2 hours;

[0041] The base paint is prepared by mixing 70 parts by mass of waterborne epoxy resin, 1 part by mass of film-forming aid, 3 parts by mass of inorganic pigment and 0.3 parts by mass of dispersant at a stirring speed of 300 rpm.

[0042] Among them, the mass ratio of base paint to high-reflective added filler is 5:1.

[0043] Example 2

[0044] Highly reflective additive fillers are prepared by the following steps:

[0045] S1. The mixed aluminum powder and titanium dioxide are crushed and evenly dispersed in a dispersant to obtain a mixture A;

[0046] S2. The grinding aid and triethanolamine were sequentially added to the mixture A and stirred at 26.5 ° C for 2 hours to obtain a highly reflective filler;

[0047] Among them, the mass ratio of mixed aluminum powder to titanium dioxide is 4:2;

[0048] Wherein, the particle size of the mixed aluminum powder is 450 mesh;

[0049] Among them, the particle size of titanium dioxide is 350 mesh;

[0050] Among them, the mass ratio of the grinding aid to triethanolamine is 3:0.6.

[0051] A water-based anti-corrosion coating for renovation of a color steel tile roof, the coating being prepared by the following steps: 23 parts by weight of an additive and 70 parts by weight of a base paint are mixed, heated to 22° C. to obtain a mixture B, and then 20 parts by weight of a high-reflection additive filler are added to the mixture B in multiple portions, stirred for 0.65 hours, and a thickener is added to obtain a water-based anti-corrosion coating for renovation of a color steel tile roof;

[0052] The additive is prepared by mixing 25 parts by mass of a dispersant, 15 parts by mass of a defoamer, 7 parts by mass of a leveling agent, and 7 parts by mass of a thickener under stirring at a stirring speed of 1600 rpm for 2.5 hours;

[0053] The base paint is prepared by mixing 70 parts by mass of waterborne epoxy resin, 2 parts by mass of film-forming aid, 4 parts by mass of inorganic pigment and 0.4 parts by mass of dispersant at a stirring speed of 400 rpm.

[0054] Among them, the mass ratio of base paint to high-reflective added filler is 5:1.5.

[0055] Example 3

[0056] Highly reflective additive fillers are prepared by the following steps:

[0057] S1. The mixed aluminum powder and titanium dioxide are crushed and evenly dispersed in a dispersant to obtain a mixture A;

[0058] S2. The grinding aid and triethanolamine were sequentially added to the mixture A and stirred at 28 ° C for 3 hours to obtain a highly reflective filler;

[0059] Among them, the mass ratio of mixed aluminum powder to titanium dioxide is 5:3;

[0060] Wherein, the particle size of the mixed aluminum powder is 500 mesh;

[0061] Wherein, the particle size of titanium dioxide is 400 mesh;

[0062] Among them, the mass ratio of the grinding aid to triethanolamine is 4:0.7.

[0063] A water-based anti-corrosion coating for renovation of color steel tile roofs, the coating being prepared by the following steps: 30 parts by weight of an additive and 80 parts by weight of a base paint are mixed, heated to 24° C. to obtain a mixture B, and then 24 parts by weight of a high-reflection additive filler are added to the mixture B in multiple portions, stirred for 0.8 hours, and a thickener is added to obtain a water-based anti-corrosion coating for renovation of color steel tile roofs;

[0064] The additive is prepared by mixing 30 parts by mass of a dispersant, 20 parts by mass of a defoamer, 10 parts by mass of a leveling agent, and 10 parts by mass of a thickener under stirring at a stirring speed of 1700 rpm for 3 hours;

[0065] The base paint is prepared by mixing 70 parts by mass of waterborne epoxy resin, 3 parts by mass of film-forming aid, 5 parts by mass of inorganic pigment and 0.5 parts by mass of dispersant at a stirring speed of 500 rpm.

[0066] Among them, the mass ratio of base paint to high-reflective added filler is 5:2.

[0067] Example 4

[0068] This embodiment provides a water-based anti-corrosion coating for renovation of color steel tile roofs. Compared with Example 1, the difference in composition is that titanium dioxide is not added in the preparation process of the high-reflective additive filler. In addition to the above differences, the materials, formula ratios and preparation operations used in this embodiment are strictly consistent with those in Example 1.

[0069] Example 5

[0070] This embodiment provides a water-based anticorrosive coating for renovation of color steel tile roofs. Compared with Example 1, the difference in composition is that triethanolamine is not added in the preparation process of the high-reflective additive filler. In addition to the above differences, the materials, formula ratios and preparation operations used in this embodiment are strictly consistent with those in Example 1.

[0071] Comparative Example 1

[0072] This comparative example provides a water-based anticorrosive coating for renovation of color steel tile roofs. Compared with Example 1, the difference in composition is that an equal amount of acrylic resin is used to replace water-based epoxy resin. Except for the above difference, the materials, formula ratios and preparation operations used in this comparative example are strictly consistent with those in Example 1.

[0073] Test Case

[0074] 1. Participants

[0075] In this test example, the water-based anti-corrosion coating for renovation of color steel tile roofs prepared in Examples 1 to 5 and Comparative Example 1 was used as a test object to conduct relevant performance tests.

[0076] 2. Test content

[0077] (1) Reflective heat insulation performance

[0078] The solar reflectance and near-infrared reflectance of water-based anti-corrosion coatings used for renovation of color steel tile roofs were tested according to the provisions of 6.4 of JG / T235-2014.

[0079] The hemispherical emissivity of water-based anti-corrosion coatings used for renovation of color steel tile roofs was tested according to the provisions of 6.5 of JG / T235-2014.

[0080] The thermal insulation temperature difference of water-based anti-corrosion coatings used for renovation of color steel tile roofs was tested in accordance with the provisions of Appendix B of GBT25261-2018.

[0081] (2) Anti-corrosion performance

[0082] The water resistance and salt resistance of the paint film after the water-based anti-corrosion paint for color steel tile roof renovation are used to characterize the weather resistance of the coating. Among them, the water resistance refers to the national standard GB / T 1733-1993 (Method A), and the salt resistance refers to the national standard GB / T1763-1989.

[0083] 3. Experimental results

[0084] Table 1 Test results of relevant properties of water-based anticorrosive coatings for color steel tile roof renovation

[0085]

[0086] The relevant performance test results of the water-based anti-corrosion coatings for color steel tile roof renovation provided in Examples 1 to 5 and Comparative Example 1 are shown in Table 1.

[0087] The solar reflectance of Examples 1 to 3 is relatively high, maintained between 92.3% and 93.1%, indicating that these coatings can effectively reflect sunlight and reduce heat absorption. The solar reflectance of Example 4 (without titanium dioxide) and Example 5 (without triethanolamine) has decreased, especially Example 5 has decreased significantly, indicating that titanium dioxide and triethanolamine play an important role in improving the solar reflectance. The solar reflectance of Comparative Example 1 (using acrylic resin) is the lowest, only 84.7%, indicating that water-based epoxy resin is superior to acrylic resin in improving reflective performance.

[0088] Similar to the sunlight reflectance, the near infrared reflectance of Examples 1 to 3 is also high, maintained between 91.2% and 92.6%. The near infrared reflectance of Examples 4 and 5 decreased, and the near infrared reflectance of Comparative Example 1 was the lowest. This shows that titanium dioxide and triethanolamine are also helpful in improving the near infrared reflectance, and water-based epoxy resin is superior to acrylic resin in this respect.

[0089] The hemispherical emissivity of Example 1 is the highest, at 94.5%, indicating that it can effectively dissipate the absorbed heat in the form of thermal radiation. The hemispherical emissivity of Examples 2 to 5 gradually decreases, and the hemispherical emissivity of Comparative Example 1 is the lowest. This shows that the addition of titanium dioxide and triethanolamine helps to improve the hemispherical emissivity of the coating, and the water-based epoxy resin is also better than the acrylic resin in this respect.

[0090] The thermal insulation temperature difference of Example 1 is the largest, which is 23.6°C, indicating that it has the best thermal insulation effect. The thermal insulation temperature difference of Examples 2 to 5 gradually decreases, and the thermal insulation temperature difference of Comparative Example 1 is the smallest, which is only 9.4°C. This further confirms the role of titanium dioxide, triethanolamine and water-based epoxy resin in improving the thermal insulation performance of the coating.

[0091] The above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit the protection scope of the present invention. Although the present invention is described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the technical solutions of the present invention can be modified or equivalently replaced, but these modifications or replacements are all within the protection scope of the present invention.

Claims

1. A water-based anti-corrosion coating for renovation of color steel tile roofs, characterized in that: The invention comprises the following components in parts by weight: 60 to 80 parts of base paint and 16 to 24 parts of high-reflective additive filler; The high reflective additive filler is prepared by the following steps: S1. The mixed aluminum powder and titanium dioxide are crushed and evenly dispersed in a dispersant to obtain a mixture A; S2. Add a grinding aid and triethanolamine to mixture A in sequence, stir at 25-28° C. for 1-3 hours to obtain a highly reflective added filler.

2. The water-based anticorrosive coating for color steel tile roof renovation according to claim 1, characterized in that: In the high-reflective additive filler preparation step S1, the mass ratio of the mixed aluminum powder to the titanium dioxide is (3-5): (1-3).

3. The water-based anticorrosive coating for color steel tile roof renovation according to claim 1, characterized in that: The particle size of the mixed aluminum powder is 400-500 meshes.

4. The water-based anticorrosive coating for color steel tile roof renovation according to claim 1, characterized in that: The particle size of the titanium dioxide is 300-400 meshes.

5. The water-based anticorrosive coating for color steel tile roof renovation according to claim 1, characterized in that: In the high-reflection additive filler preparation step S2, the mass ratio of the grinding aid to the triethanolamine is (2-4): (0.5-0.7).

6. The water-based anticorrosive coating for color steel tile roof renovation according to claim 1, characterized in that: The mass ratio of the base paint to the high-reflective added filler is 5:(1-2).

7. The water-based anticorrosive coating for color steel tile roof renovation according to claim 1, characterized in that: Calculated by weight, the raw materials used to prepare the base paint include 70 parts of epoxy resin, 1-3 parts of film-forming aid, 3-5 parts of inorganic pigment, and 0.3-0.5 parts of dispersant.

8. The water-based anticorrosive coating for color steel tile roof renovation according to claim 7, characterized in that: The epoxy resin is a water-based epoxy resin.

9. The water-based anticorrosive coating for color steel tile roof renovation according to claim 1, characterized in that: Calculated by weight, the component also includes 16 to 30 parts of additives.

10. A method for preparing a water-based anticorrosive coating for renovation of color steel tile roofs as claimed in claims 1 to 9, characterized in that: The following steps are involved: S1. Preparing additives in a reactor at 1500 to 1700 rpm; S2. preparing a base paint, the base paint containing the fatty acid resin, the film-forming aid, the inorganic pigment and the dispersant; S3. Mixing the additives in step S1 and the base paint in step S2, heating to 20 to 24° C. to obtain a mixture B; S4. Add the high-reflective filler into the mixture B in step S3 in multiple times, disperse and stir for 0.5 to 0.8 hours, add a thickener, and obtain a water-based anti-corrosion coating for color steel tile roof renovation.

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