Color steel tile renovation coating and preparation method thereof

Abstract

The invention discloses a color steel tile renovation coating and a preparation method thereof. The color steel tile renovating coating provided by the invention comprises the following components in parts by mass: 40-65 parts of film-forming resin; 15 to 25 parts of a high flash point solvent; 5 to 10 parts of aluminum silver paste; 0 to 20 parts of pigment paste; 0.5 to 2 parts of benzotriazole; 0.05 to 0.2 part of cerium citrate; and 0.005 to 0.02 part of a drier. The preparation method of the color steel tile renovating coating is very simple, and the color steel tile renovating coating is obtained by uniformly mixing the components in batches. The color steel tile renovating coating is friendly to an old paint film and can be directly coated on a rusty surface with rust, the formed paint film is large in adhesive force, good in weather resistance and good in water resistance, and the color steel tile renovating coating is simple in preparation method, low in production cost and suitable for large-scale industrial production and application.

Description

Technical Field

[0001] The invention relates to the technical field of coatings, and in particular to a color steel tile renovation coating and a preparation method thereof. Background Art

[0002] Color steel tiles (also known as: colored corrugated tiles) are a kind of corrugated sheets made of color coated steel plates by roller rolling and cold bending. They are light, strong, colorful, easy to construct, fireproof, and rainproof, and have been widely used. As we all know, with the increase of years of use, colored steel tiles will inevitably have problems such as rust and paint film damage, and need to be refurbished and repaired in time. At present, the renovation methods of color steel tiles mainly include the following two methods: 1) First, remove rust and polish the surface of the color steel tiles, and then apply anti-rust paint. However, since the color steel tiles themselves are relatively thin and the rust is often deeply rooted, it is generally difficult to polish thoroughly; 2) Use rust conversion liquid to directly dissolve the rust and convert it into a black chelating filler, passivate it on the surface of the color steel tiles to form a protective paint film, and then apply anti-rust paint. However, since the effective ingredient of the rust conversion liquid is acid (for example, tannic acid, citric acid, phosphoric acid, etc.), it not only has the effect of converting and fixing rust, but also has a destructive effect on the old paint film (for example, it will cause the paint film to wrinkle, powder, whiten, fall off, etc.). This method is not suitable for color steel tiles with some rust and some old paint films still on. Studies have shown that in the renovation process of color steel tiles, the adhesion between the new coating and the rusty substrate or the old paint film is the key factor. Only by ensuring that the coating is stable and does not fall off can the ideal protection and decorative effect be achieved in the end. However, there is currently no renovation paint that can simultaneously deal with various degrees of rust on color steel tiles.

[0003] Therefore, it is of great significance to develop a renovation coating suitable for color steel tiles with various degrees of rust. Summary of the invention

[0004] The purpose of the present invention is to provide a color steel tile renovation coating and a preparation method thereof.

[0005] The technical solution adopted by the present invention is:

[0006] A color steel tile renovation paint, comprising the following components in parts by weight:

[0007] Film-forming resin: 40 to 65 parts;

[0008] High flash point solvent: 15 to 25 parts;

[0009] Aluminum paste: 5 to 10 parts;

[0010] Pigment slurry: 0 to 20 parts;

[0011] Benzotriazole: 0.5 to 2 parts;

[0012] Cerium citrate: 0.05 to 0.2 parts;

[0013] Drier: 0.005 to 0.02 parts;

[0014] The film-forming resin is polymerized from tung oil, soybean oil, linseed oil and auxiliary resin;

[0015] The auxiliary resin is at least one of phenolic resin, dehydrated malic anhydride resin and C9 petroleum resin.

[0016] Preferably, the film-forming resin is polymerized from the following components in parts by mass:

[0017] Tung oil: 1 to 4 parts;

[0018] Soybean oil: 5 to 10 parts;

[0019] Linseed oil: 3 to 9 parts;

[0020] Auxiliary resin: 15 to 35 parts.

[0021] Preferably, the film-forming resin is prepared by a preparation method comprising the following steps: mixing tung oil, soybean oil, linseed oil and tetramethylbenzene, adding an auxiliary resin and mixing, then reacting at 160°C to 170°C until the acid value is less than 5 mgKOH / g, then adding tetramethylbenzene to dilute the product, cooling it, filtering and obtaining the filtrate to obtain the film-forming resin.

[0022] Preferably, the flash point of the high flash point solvent is ≥ 60°C.

[0023] Further preferably, the high flash point solvent is at least one of tetramethylbenzene and 1500# solvent oil.

[0024] Preferably, the main component of the aluminum-silver paste is aluminum powder coated with stearic acid, and the mass percentage of the aluminum powder in the aluminum-silver paste is ≥60%.

[0025] Preferably, the pigment paste is at least one of white pigment paste, gray pigment paste, blue pigment paste, green pigment paste, yellow pigment paste, iron red pigment paste, red pigment paste, and purple pigment paste.

[0026] Preferably, the drying agent is at least one of manganese naphthenate, cobalt naphthenate, and copper naphthenate.

[0027] A method for preparing the above-mentioned color steel tile renovation coating comprises the following steps:

[0028] 1) dispersing aluminum paste and benzotriazole with a high flash point solvent to obtain an aluminum paste dispersion;

[0029] 2) Disperse the aluminum silver paste dispersion in the film-forming resin, then add the pigment paste to disperse, then add cerium citrate and a drying agent to disperse, and then obtain the color steel tile renovation paint.

[0030] Preferably, the dispersion method in step 1) is mechanical stirring, the stirring rate is 800r / min to 1000r / min, and the stirring time is 5min to 10min.

[0031] Preferably, the dispersion method in step 2) is mechanical stirring, and the stirring rate is 800r / min to 1000r / min.

[0032] The beneficial effects of the present invention are: the color steel tile renovation paint of the present invention is friendly to the old paint film, can be directly painted on the rusty surface with rust, the formed paint film has strong adhesion, good weather resistance and good water resistance, and its preparation method is simple and the production cost is low, and it is suitable for large-scale industrial production and application.

[0033] Specifically:

[0034] 1) The film-forming material in the color steel tile renovation coating of the present invention is polymerized by tung oil, soybean oil, linseed oil and auxiliary resin, wherein tung oil and linseed oil are drying oils, soybean oil is semi-drying oil, and the drying property of the film-forming resin can be flexibly adjusted by adjusting the ratio of the three. In addition, the film-forming material in the color steel tile renovation coating of the present invention has excellent fluidity and permeability, and can well penetrate into the pores on the surface of the color steel tile and fill them;

[0035] 2) The solvent in the color steel tile renovation coating of the present invention is a high flash point solvent, so the coating has a high flash point and is a safe chemical (meets the classification standard in "GB 30000.1-2024 Chemical Classification and Labeling Specification Part 1: General Rules");

[0036] 3) Benzotriazole is added to the color steel tile renovation paint of the present invention, which can not only react with metals such as iron to form a protective film, but also the aromatic ring inside the molecule has an oxidizing effect, which can reduce the oxidation state of iron, thereby playing a rust-fixing role. In addition, cerium citrate and benzotriazole have a synergistic effect, which can form a uniform and dense protective film on the surface of the color steel tile, and can provide good adhesion for the paint film for color steel tiles with different degrees of rust;

[0037] 4) The color steel tile renovation paint of the present invention contains a large amount of aluminum silver paste, and its flaky structure and light reflectivity can significantly improve the weather resistance and water resistance of the coating film, thereby providing better protection for the color steel tiles. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 This is the infrared spectrum of the film-forming resin in Example 1. DETAILED DESCRIPTION

[0039] The present invention will be further explained and illustrated below in conjunction with specific embodiments.

[0040] Embodiment 1:

[0041] A color steel tile renovation paint, the composition of which is shown in the following table:

[0042] Table 1 Composition of a color steel tile renovation coating

[0043]

[0044] Note:

[0045] The preparation method of the film-forming resin is as follows: 1.5 g of tung oil, 6 g of soybean oil, 4.4 g of linseed oil and 7.4 g of tetramethylbenzene are stirred evenly, and then 18.6 g of C9 petroleum resin is added and stirred evenly, and then the temperature is raised to 165°C and kept for reaction for 4 hours, and then the acid value is measured until the acid value is less than 5 mgKOH / g, and then 10.6 g of tetramethylbenzene is added to dilute the product, and then the temperature is lowered to below 70°C and the filtrate is filtered to obtain the film-forming resin.

[0046] The infrared spectrum of the film-forming resin in this embodiment is as follows: Figure 1 shown.

[0047] Depend on Figure 1 It can be seen that the characteristic peaks include the stretching vibration of methyl and methylene (3009cm -1 and 2927cm -1 、2854cm -1 ) and -C=C- double bond absorption (1605cm -1 ), the peak in the higher wave number band (about 1745cm -1 ) corresponds to the stretching vibration of C=O in the carboxylate ion, indicating that a film-forming resin with the expected structure and composition was indeed synthesized in this example.

[0048] The preparation method of the above-mentioned color steel tile renovation coating is as follows:

[0049] 1) adding aluminum paste and benzotriazole into tetramethylbenzene and soaking for 1 hour, then stirring at a stirring rate of 800 r / min for 5 minutes to obtain an aluminum paste dispersion;

[0050] 2) Slowly add the aluminum silver paste dispersion into the film-forming resin in a stirring state at a stirring rate of 900 r / min, then slowly add the white pigment paste in a stirring state until the material has no lumps, then add cerium citrate and manganese naphthenate, and continue stirring for 10 minutes to obtain the color steel tile renovation paint (recorded as sample 1).

[0051] Embodiment 2:

[0052] A color steel tile renovation paint, the composition of which is shown in the following table:

[0053] Table 2 Composition of a color steel tile renovation coating

[0054]

[0055] Note:

[0056] The preparation method of the film-forming resin is as follows: 3.5 g of tung oil, 9.1 g of soybean oil, 7.1 g of linseed oil and 5.29 g of tetramethylbenzene are stirred evenly, and then 30 g of C9 petroleum resin is added and stirred evenly, and then the temperature is raised to 165°C and kept for reaction for 4 hours, and then the acid value is measured until the acid value is less than 5 mgKOH / g, and then 10 g of tetramethylbenzene is added to dilute the product, and then the temperature is lowered to below 70°C and the filtrate is filtered to obtain the film-forming resin (infrared spectrum test shows that the film-forming resin with the expected structure and composition is indeed synthesized in this embodiment).

[0057] The preparation method of the above-mentioned color steel tile renovation coating is as follows:

[0058] 1) adding aluminum paste and benzotriazole into tetramethylbenzene and soaking for 1 hour, then stirring at a stirring rate of 1000 r / min for 5 minutes to obtain an aluminum paste dispersion;

[0059] 2) Slowly add the aluminum silver paste dispersion into the film-forming resin in a stirring state at a stirring rate of 1000 r / min, then add cerium citrate and cobalt naphthoate, and continue stirring for 10 minutes to obtain the color steel tile renovation paint (recorded as sample 2).

[0060] Embodiment 3:

[0061] A color steel tile renovation paint, the composition of which is shown in the following table:

[0062] Table 3 Composition of a color steel tile renovation coating

[0063]

[0064] Note:

[0065] The preparation method of the film-forming resin is as follows: 3.2 g of tung oil, 7.6 g of soybean oil, 6 g of linseed oil and 11.1 g of tetramethylbenzene are stirred evenly, and then 26 g of C9 petroleum resin is added and stirred evenly, and then the temperature is raised to 165°C and kept for reaction for 4 hours, and then the acid value is measured until the acid value is less than 5 mgKOH / g, and then 10 g of tetramethylbenzene is added to dilute the product, and then the temperature is lowered to below 70°C and the filtrate is filtered to obtain the film-forming resin (infrared spectrum test shows that the film-forming resin with the expected structure and composition is indeed synthesized in this embodiment).

[0066] The preparation method of the above-mentioned color steel tile renovation coating is as follows:

[0067] 1) adding aluminum paste and benzotriazole into tetramethylbenzene and soaking for 1 hour, then stirring at a stirring rate of 930 r / min for 5 minutes to obtain an aluminum paste dispersion;

[0068] 2) Slowly add the aluminum silver paste dispersion into the film-forming resin in a stirring state at a stirring rate of 930 r / min, then slowly add the purple pigment paste in a stirring state until the material has no lumps, then add cerium citrate and copper naphthenate, and continue stirring for 10 minutes to obtain the color steel tile renovation paint (recorded as sample 3).

[0069] Embodiment 4:

[0070] A color steel tile renovation paint, the composition of which is shown in the following table:

[0071] Table 4 Composition of a color steel tile renovation coating

[0072]

[0073] Note:

[0074] The preparation method of the film-forming resin is as follows: 2.7 g of tung oil, 6.1 g of soybean oil, 6 g of linseed oil and 15.3 g of tetramethylbenzene are stirred evenly, and then 23 g of C9 petroleum resin is added and stirred evenly, and then the temperature is raised to 165°C and kept for reaction for 4 hours, and then the acid value is measured until the acid value is less than 5 mgKOH / g, and then 6.7 g of tetramethylbenzene is added to dilute the product, and then the temperature is lowered to below 70°C and the filtrate is filtered to obtain the film-forming resin (infrared spectrum test shows that the film-forming resin with the expected structure and composition is indeed synthesized in this embodiment).

[0075] The preparation method of the above-mentioned color steel tile renovation coating is as follows:

[0076] 1) Add aluminum paste and benzotriazole into tetramethylbenzene and 1500# solvent oil and soak for 1 hour, then start stirring at a stirring rate of 950r / min for 5 minutes to obtain an aluminum paste dispersion;

[0077] 2) Slowly add the aluminum silver paste dispersion into the film-forming resin in a stirring state at a stirring rate of 950 r / min, then slowly add the blue pigment paste in a stirring state until the material has no lumps, then add cerium citrate and manganese naphthenate, and continue stirring for 10 minutes to obtain the color steel tile renovation paint (recorded as sample 4).

[0078] Embodiment 5:

[0079] A color steel tile renovation paint, the composition of which is shown in the following table:

[0080] Table 5 Composition of a color steel tile renovation coating

[0081]

[0082] Note:

[0083] The preparation method of the film-forming resin is as follows: 3.7 g of tung oil, 8.1 g of soybean oil, 6.4 g of linseed oil and 11.9 g of tetramethylbenzene are stirred evenly, and then 26.4 g of C9 petroleum resin is added and stirred evenly, and then the temperature is raised to 165°C and kept for reaction for 4 hours, and then the acid value is measured until the acid value is less than 5 mgKOH / g, and then 6.1 g of tetramethylbenzene is added to dilute the product, and then the temperature is lowered to below 70°C and the filtrate is filtered to obtain the film-forming resin (infrared spectrum test shows that the film-forming resin with the expected structure and composition is indeed synthesized in this embodiment).

[0084] The preparation method of the above-mentioned color steel tile renovation coating is as follows:

[0085] 1) adding aluminum paste and benzotriazole into tetramethylbenzene and soaking for 1 hour, then stirring at a stirring rate of 800 r / min for 5 minutes to obtain an aluminum paste dispersion;

[0086] 2) Slowly add the aluminum silver paste dispersion into the film-forming resin in a stirring state at a stirring rate of 800 r / min, then slowly add the blue pigment paste in a stirring state until the material has no lumps, then add cerium citrate and manganese naphthenate, and continue stirring for 10 minutes to obtain the color steel tile renovation paint (recorded as sample 5).

[0087] Comparative Example 1:

[0088] A color steel tile renovation paint, the composition of which is shown in the following table:

[0089] Table 6 Composition of a color steel tile renovation coating

[0090]

[0091] The preparation method of the above-mentioned color steel tile renovation coating is as follows:

[0092] 1) adding aluminum paste to tetramethylbenzene and soaking for 1 hour, then stirring at a stirring rate of 800 r / min for 5 minutes to obtain an aluminum paste dispersion;

[0093] 2) Slowly add the aluminum silver paste dispersion to the film-forming resin in a stirring state at a stirring rate of 800 r / min, then slowly add the blue pigment paste in a stirring state until the material has no lumps, then add manganese naphthenate, and continue stirring for 10 minutes to obtain the color steel tile renovation paint (recorded as comparison sample 1).

[0094] Comparative Example 2:

[0095] A color steel tile renovation paint, the composition of which is shown in the following table:

[0096] Table 7 Composition of a color steel tile renovation coating

[0097]

[0098] The preparation method of the above-mentioned color steel tile renovation coating is as follows:

[0099] 1) adding benzotriazole into tetramethylbenzene and soaking for 1 hour, then stirring at a stirring rate of 800 r / min for 5 minutes to obtain a benzotriazole dispersion;

[0100] 2) Slowly add the benzotriazole dispersion into the film-forming resin in a stirring state at a stirring rate of 800 r / min, then slowly add the blue pigment slurry in a stirring state until the material has no lumps, then add cerium citrate and manganese naphthoate, and continue stirring for 10 minutes to obtain the color steel tile renovation paint (recorded as comparison sample 2).

[0101] Comparative Example 3:

[0102] A color steel tile renovation paint (referred to as comparative sample 3) is exactly the same as the color steel tile renovation paint in Example 5, except that the weight of the film-forming resin is replaced by the alkyd resin AK2960E produced by Guangdong Tongde New Materials Co., Ltd.

[0103] Comparative Example 4:

[0104] A color steel tile renovation paint, the composition of which is shown in the following table:

[0105] Table 8 Composition of a color steel tile renovation coating

[0106]

[0107]

[0108] The preparation method of the above-mentioned color steel tile renovation coating is as follows:

[0109] 1) adding aluminum paste to tetramethylbenzene and soaking for 1 hour, then stirring at a stirring rate of 800 r / min for 5 minutes to obtain an aluminum paste dispersion;

[0110] 2) Slowly add the aluminum silver paste dispersion to the film-forming resin in a stirring state at a stirring rate of 800 r / min, then slowly add the blue pigment paste in a stirring state until the material has no lumps, then add cerium citrate and manganese naphthoate, and continue stirring for 10 minutes to obtain the color steel tile renovation paint (recorded as comparison sample 4).

[0111] Comparative Example 5:

[0112] A color steel tile renovation paint, the composition of which is shown in the following table:

[0113] Table 9 Composition of a color steel tile renovation coating

[0114]

[0115] The preparation method of the above-mentioned color steel tile renovation coating is as follows:

[0116] 1) adding aluminum paste and benzotriazole into tetramethylbenzene and soaking for 1 hour, then stirring at a stirring rate of 800 r / min for 5 minutes to obtain an aluminum paste dispersion;

[0117] 2) Slowly add the aluminum silver paste dispersion into the film-forming resin in a stirring state at a stirring rate of 800 r / min, then slowly add the blue pigment paste in a stirring state until the material has no lumps, then add manganese naphthenate, and continue stirring for 10 minutes to obtain the color steel tile renovation paint (recorded as comparison sample 5).

[0118] Performance Test:

[0119] 40 300mm×200mm color steel tiles were prepared in advance for making test panels. 20 of them were thoroughly polished of old paint, and then placed in a salt spray test box for 48 hours, and then taken out to dry, to obtain 20 rusty color steel tiles. The other 20 color steel tiles were not treated (including old paint film color steel tiles), and then sprayed with samples 1 to 5 and comparison samples 1 to 5 respectively to prepare a paint film with a thickness of 50μm to 60μm. The appearance, adhesion and weather resistance of the paint film were tested. The test results are shown in the following table:

[0120] Table 10 Appearance, adhesion and weather resistance test results of samples 1 to 5 and comparative samples 1 to 5

[0121]

[0122]

[0123] Note:

[0124] Paint film appearance: visual inspection.

[0125] Adhesion: Test with reference to "GB / T 9286-1998 Paint and varnish cross-cut test".

[0126] Weather resistance: Tested by QUVA, the paint film passes if it does not powder, crack or fall off; it fails if the paint film powders, cracks or falls off.

[0127] From Table 10, we can see that:

[0128] a) The adhesion of the samples of Examples 1 to 5 on both the color steel tiles containing old paint films and the rusty color steel tiles can reach level 1, while the adhesion of the sample of Comparative Example 1 on the rusty color steel tiles is level 2, indicating that the color steel tile renovation paint with the addition of benzotriazole and cerium citrate has better adhesion to the rusty substrate;

[0129] b) The paint films formed on the samples of Examples 1 to 5, whether on the color steel tile plates containing old paint films or on the rusty color steel tile plates, can pass the 200h weathering resistance test, while the paint films formed on the two substrates of the samples of Comparative Example 2 showed cracking and could not pass the 200h weathering resistance test, indicating that the aluminum silver paste can play a role in improving the weathering resistance of the paint film in the color steel tile renovation coating;

[0130] c) The adhesion of the samples of Examples 1 to 5 on both the color steel tiles with old paint films and the rusty color steel tiles can reach level 1, while the adhesion of the sample of Comparative Example 3 on the rusty color steel tiles is level 3, indicating that the film-forming resin synthesized from tung oil, soybean oil, linseed oil and auxiliary resin is more suitable for coating rusty substrates than conventional alkyd resins;

[0131] d) From the adhesion test data of the samples of Example 5, Comparative Example 4 and Comparative Example 5 on the rusty colored steel tile plate, it can be seen that benzotriazole and cerium citrate have a synergistic effect. When added together, the adhesion of the paint film can reach level 1;

[0132] In summary, the color steel tile renovation paint of the present invention can be directly applied on the rusty surface with rust, and the formed paint film has strong adhesion, good weather resistance and good water resistance, and is suitable for color steel tiles with various degrees of rust.

[0133] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. A color steel tile renovation coating, characterized in that: The composition comprises the following components in parts by weight: Film-forming resin: 40 to 65 parts; High flash point solvent: 15 to 25 parts; Aluminum paste: 5 to 10 parts; Pigment slurry: 0 to 20 parts; Benzotriazole: 0.5 to 2 parts; Cerium citrate: 0.05 to 0.2 parts; Drier: 0.005 to 0.02 parts; The film-forming resin is polymerized from tung oil, soybean oil, linseed oil and auxiliary resin; The auxiliary resin is at least one of phenolic resin, dehydrated malic anhydride resin and C9 petroleum resin.

2. The color steel tile renovation paint according to claim 1 is characterized in that: The film-forming resin is polymerized by the following components in parts by mass: Tung oil: 1 to 4 parts; Soybean oil: 5 to 10 parts; Linseed oil: 3 to 9 parts; Auxiliary resin: 15 to 35 parts.

3. The color steel tile renovation coating according to claim 1 or 2, characterized in that: The film-forming resin is prepared by a preparation method comprising the following steps: mixing tung oil, soybean oil, linseed oil and tetramethylbenzene, adding an auxiliary resin and mixing, then keeping the temperature at 160°C to 170°C for reaction until the acid value is less than 5mgKOH / g, then adding tetramethylbenzene to dilute the product, cooling it, filtering and collecting the filtrate to obtain the film-forming resin.

4. The color steel tile renovation coating according to claim 1 or 2, characterized in that: The flash point of the high flash point solvent is ≥60°C.

5. The color steel tile renovation coating according to claim 1 or 2, characterized in that: The main component of the aluminum-silver paste is aluminum powder coated with stearic acid, and the mass percentage of the aluminum powder in the aluminum-silver paste is ≥60%.

6. The color steel tile renovation paint according to claim 1 or 2, characterized in that: The pigment paste is at least one of white pigment paste, gray pigment paste, blue pigment paste, green pigment paste, yellow pigment paste, iron red pigment paste, red pigment paste, and purple pigment paste.

7. The color steel tile renovation coating according to claim 1 or 2, characterized in that: The drying agent is at least one of manganese naphthenate, cobalt naphthenate, and copper naphthenate.

8. A method for preparing a color steel tile renovation coating as claimed in any one of claims 1 to 7, characterized in that: The following steps are involved: 1) dispersing aluminum paste and benzotriazole with a high flash point solvent to obtain an aluminum paste dispersion; 2) Disperse the aluminum silver paste dispersion in the film-forming resin, then add the pigment paste to disperse, then add cerium citrate and a drying agent to disperse, and then obtain the color steel tile renovation paint.

9. The preparation method according to claim 8, characterized in that: Step 1) The dispersion method is mechanical stirring, the stirring rate is 800r / min to 1000r / min, and the stirring time is 5min to 10min.

10. The preparation method according to claim 8 or 9, characterized in that: Step 2) The dispersion method is mechanical stirring, and the stirring rate is 800r / min to 1000r / min.

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