Weather-resistant nano-elastic paint and preparation method thereof

Abstract

The present application relates to the technical field of nano elastic paint, in particular to a kind of weather-resistant nano elastic paint and preparation method thereof, comprising: epoxy resin, modified glass flake, nano titanium dioxide and organic solvent are placed into high-speed dispersion machine, stirring is uniform, and mixed material is obtained;Curing agent is placed into high-speed dispersion machine, continue stirring, and weather-resistant nano elastic paint is prepared.The present application improves the overall performance of elastic paint by coating nano titanium dioxide on the surface of glass flake and using additional nano titanium dioxide together, specifically, the coated nano titanium dioxide improves the ultraviolet light resistance of glass flake, can well reduce the damage of ultraviolet light to coating, and improves weather resistance;And, modified glass flake overlaps in coating matrix and forms a barrier, combined with nano titanium dioxide can be filled in the gap of insufficient overlap, so that the coating has excellent corrosion resistance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of nano-elastic paint, in particular to a weather-resistant nano-elastic paint and a preparation method thereof. BACKGROUND

[0002] Nano-coating is a protective material widely used in modern industrial industry, which has achieved good application in many aspects such as concrete facility base protection, metal material surface treatment protection, building equipment protection, etc. By using the small size effect, surface and interface effect, quantum size effect of nano-particles, the application of nano-technology to coating synthesis process to prepare nano-functional coating has become an important development direction of modern coating research.

[0003] By adding glass flake to the coating matrix, the glass flake layer-by-layer arrangement in the coating can form a good sealing barrier to improve the corrosion resistance of the coating. Even if part of the coating is added with nano-filler to improve the weather resistance, the anti-ultraviolet performance of the glass flake is general, thereby affecting the weather resistance of the final coating. Based on this, a weather-resistant nano-elastic paint and a preparation method thereof are provided. SUMMARY

[0004] In view of the shortcomings of the prior art, the present application provides a weather-resistant nano-elastic paint and a preparation method thereof, which improves the overall performance of the elastic paint by coating nano-titanium dioxide on the surface of the glass flake and adding additional nano-titanium dioxide.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a weather-resistant nano-elastic paint, comprising the following raw materials by weight: epoxy resin 40-50 parts, modified glass flake 20-25 parts, nano-titanium dioxide 10-15 parts, curing agent 5-10 parts, and organic solvent 5-10 parts.

[0006] Preferably, the modified glass flake and nano-titanium dioxide are prepared as follows: S1, glass microflakes with a flake diameter of more than 3mm are placed in a saturated calcium hydroxide solution for treatment, and after the treatment is completed, the pretreated glass microflakes are obtained by filtering and drying; S2, the pretreated glass microflakes are dispersed in deionized water, and the pH is adjusted to 2-4 with hydrochloric acid, the temperature of the system is controlled at 65-75℃, then the titanium tetrachloride ethanol solution prepared from titanium tetrachloride and anhydrous ethanol is added dropwise, and after the reaction is completed, the filter solid and filtrate are obtained by suction filtration; S3, the filter solid is washed and ground after calcination to obtain modified glass flake with a flake diameter of less than 0.1mm; S4, continue to add titanium tetrachloride to the filtrate, and after reaction and calcination, nano-titanium dioxide is prepared.

[0007] Preferably, in step S1, the treatment temperature is 80-90℃, and the treatment time is 8-12h.

[0008] Preferably, in step S2, the concentration of the titanium tetrachloride ethanol solution is 220 g / L; and the reaction time is 1-1.5 h.

[0009] Preferably, in step S2, the molar ratio of glass microplates to titanium tetrachloride is 1:(0.1-0.2).

[0010] Preferably, in step S1, the diameter of the glass micro-flakes is 3-5 mm; in step S3, the diameter of the glass flakes is 0.05-0.1 mm.

[0011] Preferably, in step S4, the amount of titanium tetrachloride added is 10-15% of the total mass of the filtrate.

[0012] Preferably, the curing agent is a cashew oil-modified epoxy curing agent or a polyamide epoxy curing agent.

[0013] Preferably, the organic solvent is any one or a combination of butanol, toluene, and xylene.

[0014] This invention also provides a method for preparing a weather-resistant nano-elastic paint, comprising the following steps:

[0015] (1) Place epoxy resin, modified glass flakes, nano titanium dioxide and organic solvent into a high-speed disperser and stir evenly to obtain a mixture;

[0016] (2) Put the curing agent into a high-speed disperser and continue stirring to obtain a weather-resistant nano-elastic paint.

[0017] This invention provides a weather-resistant nano-elastic paint and its preparation method, which has the following advantages compared with the prior art:

[0018] This invention improves the overall performance of elastic paint by coating the surface of glass flakes with nano-sized titanium dioxide and using additional nano-sized titanium dioxide. Specifically, the coated nano-sized titanium dioxide enhances the UV protection capability of the glass flakes, effectively reducing UV damage to the coating and improving weather resistance. Furthermore, the modified glass flakes overlap to form a barrier within the coating matrix, and the nano-sized titanium dioxide fills the gaps in the insufficient overlap, resulting in excellent corrosion resistance of the coating.

[0019] In this invention, when coating titanium dioxide, glass microflakes with larger diameters are used to reduce agglomeration and facilitate uniform coating of titanium dioxide on the surface of the microflakes. Then, through grinding, uniformly coated glass flakes can be obtained, thereby further improving the weather resistance of the coating.

[0020] This invention uses calcium hydroxide solution to pretreat glass microsheets, generating a layer of silicate hydrate on their surface. This silicate hydrate acts as a buffer during calcination, reducing the thermal expansion stress between the glass and titanium dioxide, thereby reducing the amount of cracks in the titanium dioxide coating and improving the coating performance to a certain extent. Detailed Implementation

[0021] The following embodiments are provided to illustrate the implementation of this application in detail, so that the process of how this application uses technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0022] Example 1

[0023] The modified glass flakes and nano-titanium dioxide were prepared as follows:

[0024] S1. Place glass micro flakes with a diameter of 3 mm into a saturated calcium hydroxide solution and treat at 90°C for 8 hours. After treatment, filter and dry to obtain pretreated glass micro flakes.

[0025] S2. Disperse the pretreated glass micro-slabs in deionized water and adjust the pH to 4 with hydrochloric acid. Control the system temperature to 65℃, and then add a 220g / L titanium tetrachloride ethanol solution prepared by titanium tetrachloride and anhydrous ethanol. After reacting for 1.5h, filter to obtain the solid and filtrate. The molar ratio of glass micro-slabs to titanium tetrachloride is 1:0.1.

[0026] S3. The filter solid is rinsed, calcined, and then ground to obtain modified glass flakes with a diameter of 0.1 mm.

[0027] S4. Add titanium tetrachloride to the filtrate. The amount of titanium tetrachloride added is 10% of the total mass of the filtrate. After reaction and calcination, nano-titanium dioxide is obtained.

[0028] Example 2

[0029] The modified glass flakes and nano-titanium dioxide were prepared as follows:

[0030] S1. Place glass micro flakes with a diameter of 5 mm into a saturated calcium hydroxide solution and treat at 80°C for 12 hours. After treatment, filter and dry to obtain pretreated glass micro flakes.

[0031] S2. Disperse the pretreated glass micro-slabs in deionized water and adjust the pH to 2 with hydrochloric acid. Control the system temperature to 75℃, and then add a 220g / L titanium tetrachloride ethanol solution prepared by titanium tetrachloride and anhydrous ethanol. After reacting for 1 hour, filter the solution to obtain the solid and filtrate. The molar ratio of glass micro-slabs to titanium tetrachloride is 1:0.2.

[0032] S3. The filter solid is rinsed, calcined, and then ground to obtain modified glass flakes with a diameter of 0.05 mm.

[0033] S4. Add titanium tetrachloride to the filtrate. The amount of titanium tetrachloride added is 15% of the total mass of the filtrate. After reaction and calcination, nano-titanium dioxide is obtained.

[0034] Example 3

[0035] The modified glass flakes and nano-titanium dioxide were prepared as follows:

[0036] S1. Place glass micro flakes with a diameter of 4 mm into a saturated calcium hydroxide solution and treat at 85°C for 10 h. After treatment, filter and dry to obtain pretreated glass micro flakes.

[0037] S2. Disperse the pretreated glass microplates in deionized water and adjust the pH to 3 with hydrochloric acid. Control the system temperature to 70℃, and then add a 220g / L titanium tetrachloride ethanol solution prepared by titanium tetrachloride and anhydrous ethanol. After reacting for 1.2h, filter to obtain the solid and filtrate. The molar ratio of glass microplates to titanium tetrachloride is 1:0.15.

[0038] S3. The filter solid is rinsed, calcined, and then ground to obtain modified glass flakes with a diameter of 0.08 mm.

[0039] S4. Add titanium tetrachloride to the filtrate. The amount of titanium tetrachloride added is 12% of the total mass of the filtrate. After reaction and calcination, nano-titanium dioxide is obtained.

[0040] Example 4

[0041] A weather-resistant nano-elastic paint comprises the following raw materials in parts by weight: 50 parts epoxy resin, 20 parts modified glass flakes from Example 1, 15 parts nano titanium dioxide from Example 1, 5 parts cashew oil modified epoxy curing agent, and 10 parts toluene.

[0042] The preparation method of the above-mentioned weather-resistant nano-elastic paint includes the following steps:

[0043] (1) Place epoxy resin, modified glass flakes, nano titanium dioxide and toluene into a high-speed disperser and stir evenly to obtain a mixture;

[0044] (2) The cashew oil-modified epoxy curing agent was placed in a high-speed disperser and stirred continuously to obtain a weather-resistant nano-elastic paint.

[0045] Example 5

[0046] A weather-resistant nano-elastic paint comprises the following raw materials in parts by weight: 40 parts epoxy resin, 25 parts modified glass flakes from Example 2, 10 parts nano titanium dioxide from Example 2, 10 parts polyamide epoxy curing agent, and 5 parts xylene.

[0047] The preparation method of the above-mentioned weather-resistant nano-elastic paint includes the following steps:

[0048] (1) Place epoxy resin, modified glass flakes, nano titanium dioxide and xylene into a high-speed disperser and stir evenly to obtain a mixture;

[0049] (2) Put the polyamide epoxy curing agent into a high-speed disperser and continue stirring to obtain a weather-resistant nano-elastic paint.

[0050] Example 6

[0051] A weather-resistant nano-elastic paint comprises the following raw materials in parts by weight: 45 parts epoxy resin, 22 parts modified glass flakes from Example 3, 12 parts nano titanium dioxide from Example 3, 8 parts cashew oil modified epoxy curing agent, and 8 parts butanol.

[0052] The preparation method of the above-mentioned weather-resistant nano-elastic paint includes the following steps:

[0053] (1) Place epoxy resin, modified glass flakes, nano titanium dioxide and butanol into a high-speed disperser and stir evenly to obtain a mixture;

[0054] (2) The cashew oil-modified epoxy curing agent was placed in a high-speed disperser and stirred continuously to obtain a weather-resistant nano-elastic paint.

[0055] Comparative Example 1

[0056] A weather-resistant nano-elastic paint and its preparation method are basically the same as those in Example 6, except that the modified glass flakes are replaced with ordinary glass flakes (0.08 mm in diameter).

[0057] Comparative Example 2

[0058] A weather-resistant nano-elastic paint and its preparation method are basically the same as in Example 6, except that the modified glass flakes and nano-titanium dioxide are prepared as follows:

[0059] S1. Place glass micro flakes with a diameter of 0.08 mm into a saturated calcium hydroxide solution and treat at 85°C for 10 h. After treatment, filter and dry to obtain pretreated glass micro flakes.

[0060] S2. Disperse the pretreated glass microplates in deionized water and adjust the pH to 3 with hydrochloric acid. Control the system temperature to 70℃, and then add a 220g / L titanium tetrachloride ethanol solution prepared by titanium tetrachloride and anhydrous ethanol. After reacting for 1.2h, filter to obtain the solid and filtrate. The molar ratio of glass microplates to titanium tetrachloride is 1:0.15.

[0061] S3. The filter solid is rinsed, calcined, and then ground to obtain modified glass flakes with a diameter of 0.08 mm.

[0062] S4. Add titanium tetrachloride to the filtrate. The amount of titanium tetrachloride added is 12% of the total mass of the filtrate. After reaction and calcination, nano-titanium dioxide is obtained.

[0063] Comparative Example 3

[0064] The modified glass flakes and nano-titanium dioxide were prepared as follows:

[0065] S1. Disperse glass microplates with a diameter of 4 mm in deionized water and adjust the pH to 3 with hydrochloric acid. Control the system temperature at 70℃, and then add a 220 g / L titanium tetrachloride ethanol solution prepared by titanium tetrachloride and anhydrous ethanol. After reacting for 1.2 h, filter to obtain solid and filtrate. The molar ratio of glass microplates to titanium tetrachloride is 1:0.15.

[0066] S2. The filtered solid is rinsed, calcined, and then ground to obtain modified glass flakes with a diameter of 0.08 mm.

[0067] S3. Add titanium tetrachloride to the filtrate. The amount of titanium tetrachloride added is 12% of the total mass of the filtrate. After reaction and calcination, nano-titanium dioxide is obtained.

[0068] Comparative Example 4

[0069] A weather-resistant nano-elastic paint comprises the following raw materials in parts by weight: 45 parts epoxy resin, 22 parts modified glass flakes from Example 3, 8 parts cashew oil modified epoxy curing agent, and 8 parts butanol.

[0070] The preparation method of the above-mentioned weather-resistant nano-elastic paint includes the following steps:

[0071] (1) Place epoxy resin, modified glass flakes and butanol into a high-speed disperser and stir evenly to obtain a mixture;

[0072] (2) The cashew oil-modified epoxy curing agent was placed in a high-speed disperser and stirred continuously to obtain a weather-resistant nano-elastic paint.

[0073] Quality Inspection

[0074] The weather-resistant nano-elastic paints prepared in Examples 4-6 and Comparative Examples 1-4 were sprayed onto samples and their performance was tested after standing at room temperature for 7 days. The specific results are shown in the table below.

[0075] 1. Abrasion resistance: Tested according to GB / T1768-89 Test method for abrasion resistance of paint film, with a load of 500g and a sanding speed of 500r.

[0076] 2. Weather resistance: The coating was tested for weather resistance by UV aging in a UV aging test chamber. The coating was placed in a UV aging chamber with UV radiation (313nm, 1.25kw) and continuously irradiated. The degree of aging of the coating was observed at regular intervals.

[0077] 3. Salt spray resistance test: The coating samples are tested for salt spray resistance using a salt spray test chamber.

[0078] Table 1 Abrasion Resistance

[0079]

[0080]

[0081] Table 2 Weather resistance and salt spray resistance

[0082]

[0083] As can be seen from the table above, the coatings in Comparative Examples 1-4 are not as good as those in Example 6 in terms of weather resistance, salt spray resistance, and wear resistance. This indicates that modifying glass flakes by coating them with nano-titanium dioxide can significantly improve the overall quality of the coating. Furthermore, coating with large-diameter glass micro-flakes first and then refining them into small-diameter glass flakes can reduce the problem of poor coating effect caused by agglomeration, thereby improving the weather resistance of the coating. Using nano-titanium dioxide and modified glass flakes in combination can fill the gaps in the modified glass flake stack barrier in the coating, thereby improving the salt spray resistance of the coating.

[0084] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A weather-resistant nano-elastic paint, characterized in that, The raw materials include the following parts by weight: 40-50 parts epoxy resin, 20-25 parts modified glass flakes, 10-15 parts nano titanium dioxide, 5-10 parts curing agent, and 5-10 parts organic solvent. The modified glass flakes and nano-titanium dioxide were prepared as follows: S1. Place glass micro flakes with a diameter of 3 mm or more into a saturated calcium hydroxide solution for treatment. After treatment, filter and dry to obtain pretreated glass micro flakes. S2. Disperse the pretreated glass microslices in deionized water and adjust the pH to 2-4 with hydrochloric acid. Control the system temperature to 65-75℃. Then add a titanium tetrachloride ethanol solution prepared by titanium tetrachloride and anhydrous ethanol. After the reaction is completed, filter the solution to obtain the solid and filtrate. S3. The filter solid is rinsed, calcined, and then ground to obtain modified glass flakes with a diameter of less than 0.1 mm. S4. Add titanium tetrachloride to the filtrate, and after reaction and calcination, obtain nano titanium dioxide. In step S1, the processing temperature is 80-90℃ and the processing time is 8-12h; In step S2, the concentration of the titanium tetrachloride ethanol solution is 220 g / L; the reaction time is 1-1.5 h.

2. The weather-resistant nano-elastic paint according to claim 1, characterized in that, In step S2, the molar ratio of glass microplates to titanium tetrachloride is 1:(0.1-0.2).

3. The weather-resistant nano-elastic paint according to claim 1, characterized in that, In step S1, the diameter of the glass micro flakes is 3-5 mm; in step S3, the diameter of the glass flakes is 0.05-0.1 mm.

4. The weather-resistant nano-elastic paint according to claim 1, characterized in that, In step S4, the amount of titanium tetrachloride added is 10-15% of the total mass of the filtrate.

5. The weather-resistant nano-elastic paint according to claim 1, characterized in that, The curing agent is either cashew oil-modified epoxy curing agent or polyamide epoxy curing agent.

6. The weather-resistant nano-elastic paint according to claim 1, characterized in that, The organic solvent is any one or a combination of butanol, toluene, and xylene.

7. The method for preparing the weather-resistant nano-elastic paint according to any one of claims 1-6, characterized in that, Includes the following steps: (1) Place epoxy resin, modified glass flakes, nano titanium dioxide and organic solvent into a high-speed disperser and stir evenly to obtain a mixture; (2) Put the curing agent into a high-speed disperser and continue stirring to obtain weather-resistant nano-elastic paint.

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