Transparent super-hydrophilic coating containing nano material and preparation method of transparent super-hydrophilic coating

Abstract

The invention relates to the technical field of nano coatings, and discloses a transparent super-hydrophilic coating containing a nano material and a preparation method of the transparent super-hydrophilic coating, and the transparent super-hydrophilic coating comprises the nano material, polyvinyl alcohol, modified epoxy resin, a defoaming agent, a preservative, a curing agent, a solvent and water. According to the modified epoxy resin, more amino groups are connected to the surface of the epoxy resin, the hydrophilicity of the epoxy resin is improved, the stability of the epoxy resin can be improved through modification, and the characteristics of high temperature resistance, acid resistance and alkali resistance are improved. By adding the nano material, the wear resistance of the coating can be effectively improved. The transparent super-hydrophilic coating disclosed by the invention has the advantages of excellent hydrophilic property, strong adhesive force, difficulty in falling off, good high temperature resistance, acid resistance and alkali resistance, suitability for various industrial life application places and stable performance.

Description

Technical Field

[0001] The invention relates to the technical field of nano coatings, in particular to a transparent super-hydrophilic coating containing nano materials and a preparation method thereof. Background Art

[0002] Applying a coating on the surface of an object can effectively protect the surface from scratches, such as metals, from corrosion, and has the characteristics of easy cleaning and beautiful appearance. At present, there are coatings with various functions on the market, such as corrosion resistance, acid resistance, high temperature resistance, etc., which are subdivided into various fields, and the functions are also different, and one function will be highlighted. For such coatings, the application field is relatively small. Therefore, a coating with easy cleaning and good weather resistance is developed, which can be used in various environments to meet market demand. Summary of the invention

[0003] 1. Technical issues to be resolved

[0004] In view of the deficiencies of the prior art, the present invention provides a transparent super-hydrophilic coating containing nanomaterials and a preparation method thereof.

[0005] (II) Technical solution

[0006] A transparent super-hydrophilic coating containing nanomaterials comprises the following weight components:

[0007] 5-15 parts of nanomaterials, 10-20 parts of polyvinyl alcohol, 10-20 parts of modified epoxy resin, 1-2 parts of defoaming agent, 1-3 parts of preservative, 1-3 parts of curing agent, 20-50 parts of solvent, 50-90 parts of water;

[0008] The preparation method of the transparent super hydrophilic coating is as follows:

[0009] S1, bisphenol A epoxy resin and acrylic acid are mixed and stirred evenly, placed in an oil bath, the temperature is adjusted to 150-180° C., and stirred for reaction for 2-6 hours to obtain intermediate 1;

[0010] S2, placing diethylenetriamine in an ice water bath, passing nitrogen, slowly adding intermediate 1 and methanol solution dropwise, reacting at 20-30°C for 3-8h, removing methanol under reduced pressure, heating to 120-160°C and continuing the reduced pressure reaction for 2-6h to obtain a modified epoxy resin;

[0011] S3. Add modified epoxy resin and polyvinyl alcohol to the solvent in sequence, stir evenly, add nanomaterials and stir until evenly mixed, then add the mixture into water and stir continuously for 10 to 30 minutes, add defoaming agent, preservative and curing agent, stir evenly, seal and package to obtain a transparent super hydrophilic coating.

[0012] Preferably, in step S1, the mass ratio of bisphenol A epoxy resin to acrylic acid is 1:0.6-0.8.

[0013] Preferably, in step S2, the mass ratio of diethylenetriamine, intermediate 1 and methanol is 1:1.5-2:2-3.

[0014] Preferably, the nano material is one or more of nano aluminum oxide with a particle size of 20 to 40 nm, nano silicon dioxide with a particle size of 30 to 60 nm, and nano zinc oxide with a particle size of 20 to 50 nm.

[0015] Preferably, the defoaming agent is polydimethylsiloxane.

[0016] Preferably, the preservative is hydroxyisothiazolinone or methyl benzimidazole-5-carboxylate.

[0017] Preferably, the curing agent is 1061 or 1062.

[0018] Preferably, the solvent is ethylene glycol, isopropanol or N,N-dimethylformamide.

[0019] Preferably, the transparent super hydrophilic coating is used in construction engineering, road engineering, water conservancy engineering, and medical industries.

[0020] Preferably, the preparation steps are as follows:

[0021] The surface of the object to be coated is roughened and cleaned, placed in a dust-free room, dried at 60-80°C for 10-30 minutes, and a transparent super-hydrophilic coating is evenly sprayed. After spraying, it is dried at 50-80°C for 5-10 minutes, and dried at 200-400°C for 30-60 minutes. The coating on the surface of the object is completed.

[0022] (III) Beneficial technical effects

[0023] A transparent super-hydrophilic coating containing nanomaterials comprises: nanomaterials, polyvinyl alcohol, modified epoxy resin, defoaming agent, preservative, curing agent, solvent and water.

[0024] The modified epoxy resin increases the hydrophilicity of the epoxy resin by connecting more amino groups on the surface of the epoxy resin, and the stability of the epoxy resin can be increased by modification, and the properties of high temperature resistance, acid resistance and alkali resistance can be improved. Adding nanomaterials can effectively improve the wear resistance of the coating. The transparent super hydrophilic coating of the present invention has excellent hydrophilic properties, strong adhesion, is not easy to fall off, has good high temperature resistance, acid resistance and alkali resistance, is suitable for various industrial and living application places, and has stable performance. DETAILED DESCRIPTION

[0025] Example 1

[0026] The preparation method of the transparent super-hydrophilic coating is as follows:

[0027] S1. Mix 20 kg of bisphenol A epoxy resin and 12 kg of acrylic acid and stir evenly, place in an oil bath, adjust the temperature to 150° C., stir and react for 2 h to obtain intermediate 1.

[0028] S2. Place 18 kg of diethylenetriamine in an ice-water bath, pass nitrogen, slowly dropwise add intermediate 1 and 44 kg of methanol solution, react at 20°C for 3 h, remove methanol under reduced pressure, raise the temperature to 120°C and continue to react under reduced pressure for 2 h to obtain a modified epoxy resin.

[0029] S3. Add 10 kg of modified epoxy resin and 10 kg of polyvinyl alcohol to 20 kg of solvent ethylene glycol in sequence, stir evenly, add 5 kg of nano material nano alumina and stir until evenly mixed, then add the mixture to 50 kg of water and stir continuously for 10 min, add 1 kg of defoaming agent polydimethylsiloxane, 1 kg of preservative hydroxyisothiazolinone, and 1 kg of curing agent 1061, stir evenly, and seal and package to obtain a transparent super hydrophilic coating.

[0030] The spraying process is as follows:

[0031] The surface of the stainless steel countertop was roughened and cleaned, placed in a dust-free room, dried at 60°C for 10 minutes, and evenly sprayed with a transparent super-hydrophilic coating. After spraying, it was dried at 50°C for 5 minutes and dried at 200°C for 30 minutes. The surface coating of the stainless steel countertop was completed.

[0032] Example 2

[0033] The preparation method of the transparent super-hydrophilic coating is as follows:

[0034] S1. Mix 20 kg of bisphenol A epoxy resin and 16 kg of acrylic acid and stir evenly, place in an oil bath, adjust the temperature to 180° C., stir and react for 6 hours to obtain intermediate 1.

[0035] S2. Place 22 kg of diethylenetriamine in an ice-water bath, pass nitrogen, slowly dropwise add intermediate 1 and 54 kg of methanol solution, react at 30°C for 8 h, remove methanol under reduced pressure, raise the temperature to 160°C and continue the reduced pressure reaction for 6 h to obtain a modified epoxy resin.

[0036] S3. Add 20 kg of modified epoxy resin and 20 kg of polyvinyl alcohol to 50 kg of solvent isopropanol in sequence, stir evenly, add 15 kg of nano material nano silicon dioxide and stir until evenly, then add the above mixture into 90 kg of water and stir continuously for 30 minutes, add 2 kg of defoaming agent polydimethylsiloxane, 3 kg of preservative benzimidazole-5-carboxylic acid methyl ester, 3 kg of curing agent 1062, stir evenly, seal and package to obtain a transparent super hydrophilic coating.

[0037] The spraying process is as follows:

[0038] The surface of the stainless steel countertop was roughened and cleaned, placed in a dust-free room, dried at 80°C for 30 minutes, and evenly sprayed with a transparent super-hydrophilic coating. After spraying, it was dried at 80°C for 10 minutes and dried at 400°C for 60 minutes. The surface coating of the stainless steel countertop was completed.

[0039] Example 3

[0040] The preparation method of the transparent super-hydrophilic coating is as follows:

[0041] S1. Mix 20 kg of bisphenol A epoxy resin and 13 kg of acrylic acid and stir evenly, place in an oil bath, adjust the temperature to 160° C., stir and react for 3 hours to obtain intermediate 1.

[0042] S2. Place 20 kg of diethylenetriamine in an ice-water bath, pass nitrogen, slowly dropwise add intermediate 1 and 45 kg of methanol solution, react at 25 °C for 4 h, remove methanol under reduced pressure, raise the temperature to 130 °C and continue to react under reduced pressure for 3 h to obtain a modified epoxy resin.

[0043] S3. Add 12kg of modified epoxy resin and 12kg of polyvinyl alcohol to 30kg of solvent N,N-dimethylformamide in sequence, stir evenly, add 1kg of nano material nano zinc oxide and stir until evenly, then add the above mixture into 60kg of water and stir continuously for 20min, add 1kg of defoaming agent polydimethylsiloxane, 2kg of preservative hydroxyisothiazolinone, 2kg of curing agent 1062, stir evenly, seal and package to obtain a transparent super hydrophilic coating.

[0044] The spraying process is as follows:

[0045] The surface of the stainless steel countertop was roughened and cleaned, placed in a dust-free room, dried at 70°C for 20 minutes, and evenly sprayed with a transparent super-hydrophilic coating. After spraying, it was dried at 80°C for 10 minutes and dried at 300°C for 40 minutes. The surface coating of the stainless steel countertop was completed.

[0046] Example 4

[0047] The preparation method of the transparent super-hydrophilic coating is as follows:

[0048] S1. Mix 20 kg of bisphenol A epoxy resin and 15 kg of acrylic acid and stir evenly, place in an oil bath, adjust the temperature to 170° C., stir and react for 4 hours to obtain intermediate 1.

[0049] S2. Place 20 kg of diethylenetriamine in an ice-water bath, pass nitrogen, slowly dropwise add intermediate 1 and 50 kg of methanol solution, react at 25°C for 5 h, remove methanol under reduced pressure, raise the temperature to 150°C and continue to react under reduced pressure for 4 h to obtain a modified epoxy resin.

[0050] S3. Add 15 kg of modified epoxy resin and 15 kg of polyvinyl alcohol to 40 kg of solvent ethylene glycol in sequence, stir evenly, add 12 kg of nano materials nano alumina and nano silicon dioxide and stir until evenly mixed, then add the mixture into 80 kg of water and stir continuously for 20 min, add 1 kg of defoaming agent polydimethylsiloxane, 2 kg of preservative benzimidazole-5-carboxylic acid methyl ester, 3 kg of curing agent 1061, stir evenly, seal and package to obtain a transparent super hydrophilic coating.

[0051] The spraying process is as follows:

[0052] The surface of the stainless steel countertop was roughened and cleaned, placed in a dust-free room, dried at 70°C for 20 minutes, and evenly sprayed with a transparent super-hydrophilic coating. After spraying, it was dried at 60°C for 8 minutes and dried at 350°C for 50 minutes. The surface coating of the stainless steel countertop was completed.

[0053] Example 5

[0054] The preparation method of the transparent super-hydrophilic coating is as follows:

[0055] S1. Mix 20 kg of bisphenol A epoxy resin and 14 kg of acrylic acid and stir evenly, place in an oil bath, adjust the temperature to 160° C., stir and react for 5 hours to obtain intermediate 1.

[0056] S2. Place 18 kg of diethylenetriamine in an ice-water bath, pass nitrogen, slowly dropwise add intermediate 1 and 48 kg of methanol solution, react at 28 °C for 5 h, remove methanol under reduced pressure, raise the temperature to 150 °C and continue to react under reduced pressure for 5 h to obtain a modified epoxy resin.

[0057] S3. Add 18kg of modified epoxy resin and 16kg of polyvinyl alcohol to 45kg of solvent N,N-dimethylformamide in sequence, stir evenly, add 8kg of nanomaterials nano-silicon dioxide and nano-zinc oxide and stir until evenly, then add the above mixture into 70kg of water and stir continuously for 25min, add 2kg of defoaming agent polydimethylsiloxane, 1kg of preservative hydroxyisothiazolinone, 3kg of curing agent 1062, stir evenly, seal and package to obtain a transparent super hydrophilic coating.

[0058] The spraying process is as follows:

[0059] The surface of the stainless steel countertop was roughened and cleaned, placed in a dust-free room, dried at 80°C for 10 minutes, and evenly sprayed with a transparent super-hydrophilic coating. After spraying, it was dried at 80°C for 10 minutes and dried at 400°C for 30 minutes. The surface coating of the stainless steel countertop was completed.

[0060] Comparative Example 1

[0061] 15 kg of modified epoxy resin and 20 kg of polyvinyl alcohol are added to 50 kg of solvent ethylene glycol in sequence, and stirred evenly. 10 kg of nano material nano alumina is added and stirred until uniform. The mixture is then added to 60 kg of water and stirred continuously for 30 minutes. 2 kg of defoaming agent polydimethylsiloxane, 2 kg of preservative hydroxyisothiazolinone, and 2 kg of curing agent 1062 are added, stirred evenly, and sealed and packaged to obtain a transparent super hydrophilic coating.

[0062] The spraying process is as follows:

[0063] The surface of the stainless steel countertop was roughened and cleaned, placed in a dust-free room, dried at 60°C for 30 minutes, and evenly sprayed with a transparent super-hydrophilic coating. After spraying, it was dried at 80°C for 10 minutes and dried at 300°C for 60 minutes. The surface coating of the stainless steel countertop was completed.

[0064] Performance testing:

[0065] The reference standard for boiling water resistance test is GB / T 5237.4-2008, the reference standard for acid resistance test is GB / T 5237.4-2008, the reference standard for alkali resistance test is GB / T 9265-2009, and the reference standard for abrasion resistance test is ISO 8251-87.

[0066] Table 1

[0067]

[0068]

[0069] As can be seen from Table 1, the angles of Examples 1 to 5 are all less than 5°, indicating that Examples 1 to 5 have achieved super hydrophilicity.

[0070] Examples 1 to 5 have excellent boiling water resistance, acid resistance, alkali resistance and wear resistance.

[0071] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A transparent super-hydrophilic coating containing nanomaterials, characterized in that: The transparent super hydrophilic coating comprises the following components by weight: 5-15 parts of nanomaterials, 10-20 parts of polyvinyl alcohol, 10-20 parts of modified epoxy resin, 1-2 parts of defoaming agent, 1-3 parts of preservative, 1-3 parts of curing agent, 20-50 parts of solvent, 50-90 parts of water; The preparation method of the transparent super-hydrophilic coating is as follows: S1, bisphenol A epoxy resin and acrylic acid are mixed and stirred evenly, placed in an oil bath, the temperature is adjusted to 150-180° C., and stirred for reaction for 2-6 hours to obtain intermediate 1; S2, placing diethylenetriamine in an ice water bath, passing nitrogen, slowly adding intermediate 1 and methanol solution dropwise, reacting at 20-30°C for 3-8h, removing methanol under reduced pressure, heating to 120-160°C and continuing the reduced pressure reaction for 2-6h to obtain a modified epoxy resin; S3. Add modified epoxy resin and polyvinyl alcohol to the solvent in sequence, stir evenly, add nanomaterials and stir until evenly mixed, then add the mixture into water and stir continuously for 10 to 30 minutes, add defoaming agent, preservative and curing agent, stir evenly, seal and package to obtain a transparent super hydrophilic coating.

2. The transparent super-hydrophilic coating containing nanomaterials according to claim 1, characterized in that: In the step S1, the mass ratio of bisphenol A epoxy resin to acrylic acid is 1:0.6-0.

8.

3. The transparent super-hydrophilic coating containing nanomaterials according to claim 1, characterized in that: In the step S2, the mass ratio of diethylenetriamine, intermediate 1 and methanol is 1:1.5-2:2-3.

4. The transparent super-hydrophilic coating containing nanomaterials according to claim 1, characterized in that: The nano material is one or more of nano aluminum oxide with a particle size of 20 to 40 nm, nano silicon dioxide with a particle size of 30 to 60 nm, and nano zinc oxide with a particle size of 20 to 50 nm.

5. The transparent super-hydrophilic coating containing nanomaterials according to claim 1, characterized in that: The defoaming agent is polydimethylsiloxane.

6. The transparent super-hydrophilic coating containing nanomaterials according to claim 1, characterized in that: The preservative is hydroxyisothiazolinone or methyl benzimidazole-5-carboxylate.

7. The transparent super-hydrophilic coating containing nanomaterials according to claim 1, characterized in that: The curing agent is 1061 or 1062.

8. The transparent super-hydrophilic coating containing nanomaterials according to claim 1, characterized in that: The solvent is ethylene glycol, isopropanol or N,N-dimethylformamide.

9. An application of a transparent super-hydrophilic coating containing nanomaterials as claimed in claim 1, characterized in that: The transparent super-hydrophilic coating is used in construction engineering, road engineering, water conservancy engineering and medical industry.

10. The use of a transparent super-hydrophilic coating containing nanomaterials according to claim 9, characterized in that: The preparation steps are as follows: The surface of the object to be coated is roughened and cleaned, placed in a dust-free room, dried at 60-80°C for 10-30 minutes, and a transparent super-hydrophilic coating is evenly sprayed. After spraying, it is dried at 50-80°C for 5-10 minutes, and dried at 200-400°C for 30-60 minutes. The coating on the surface of the object is completed.

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