Epoxy resin coating as well as preparation method and application thereof

Abstract

The invention discloses an epoxy resin coating as well as a preparation method and application thereof. The epoxy resin coating comprises the following components in parts by weight: 80-120 parts of epoxy resin, 40-60 parts of a curing agent, 10-20 parts of filler, 5-10 parts of a catalyst and 20-40 parts of a solvent, the curing agent is prepared from 2-amino-4-sulfonamide phenol and octopamine according to the weight ratio of 1 to (0.5 to 2.5). The epoxy resin coating prepared by the invention can be cured at 100 DEG C or below, and still has good wear resistance and aging resistance.

Description

Technical Field

[0001] The present invention relates to the field of material technology, and more specifically, to an epoxy resin coating and a preparation method and application thereof. Background Art

[0002] With the rapid development of the automobile industry, the requirements for automobile coatings are getting higher and higher. Traditional automobile coatings usually require high temperatures during the curing process, usually above 100°C, which not only increases energy consumption, but may also cause thermal damage to other parts on the surface of the car. For example, the car bumper is injection molded with composite plastic materials, and the plastic will deform after being subjected to high temperatures and cannot fit the car body. Moreover, after high-temperature curing, the performance of the coating may also be affected, such as wear resistance and aging resistance.

[0003] Therefore, it is of great economic value to develop an epoxy resin coating that can be cured below 100°C and still have good wear resistance and aging resistance. Summary of the invention

[0004] The purpose of the present invention is to solve the deficiencies of the prior art and to provide an epoxy resin coating and a preparation method and application thereof.

[0005] To achieve the above object, the technical solution adopted by the present invention is:

[0006] In a first aspect, the present invention provides an epoxy resin coating comprising the following components in parts by weight:

[0007] Epoxy resin 80-120 parts, curing agent 40-60 parts, filler 10-20 parts, catalyst 5-10 parts, solvent 20-40 parts;

[0008] The curing agent is 2-amino-4-sulfonamidophenol and octopamine (hydroxyphenylethanolamine) in a weight ratio of 1: (0.5-2.5).

[0009] The epoxy resin coating prepared by the present invention can be cured below 100° C. and still has good wear resistance and aging resistance, as shown below:

[0010] The present invention finds that when the epoxy resin coating uses 2-amino-4-sulfonamidophenol and ocpamine (hydroxyphenylethanolamine) of specific types and usage ratios as curing agents for the epoxy resin, the epoxy resin coating can promote the curing reaction of the epoxy resin at a temperature below 100° C., accelerate the curing speed, and shorten the curing time; at the same time, since 2-amino-4-sulfonamidophenol and ocpamine (hydroxyphenylethanolamine) have multiple sites for curing reaction with the epoxy resin and have rigid benzene ring groups, they can react with the epoxy resin to form a stable complex network structure, which can resist or buffer the influence of the curing temperature, so that the epoxy resin coating still has strong wear resistance and aging resistance after being cured below 100° C.

[0011] Preferably, the weight ratio of the 2-amino-4-sulfonamidophenol to ocpamine (hydroxyphenylethanolamine) is 1:(1-2).

[0012] Preferably, the weight proportion of the epoxy resin is 90-110 parts.

[0013] Preferably, the epoxy resin is at least one of epoxy resin E44 and epoxy resin E51.

[0014] More preferably, the epoxy resin is epoxy resin E44 and epoxy resin E51 in a weight ratio of 1:(0.1-2).

[0015] More preferably, the epoxy resin is epoxy resin E44 and epoxy resin E51 in a weight ratio of 1:(0.5-1.5).

[0016] In the present invention, when a specific ratio of epoxy resin E44 and epoxy resin E51 is used, the epoxy resin cures faster at temperatures below 100°C, and the network structure formed by the epoxy resin and the curing agent is more stable and complex, so that the epoxy resin coating has a stronger ability to resist or buffer the effects of the curing temperature, and is more conducive to improving the wear resistance and aging resistance of the epoxy resin coating after curing below 100°C.

[0017] Preferably, the filler is at least one of wollastonite, bentonite, barium sulfate, calcium carbonate, mica powder and talc powder.

[0018] More preferably, the filler is wollastonite and mica powder in a weight ratio of 1:(0.1-1.5).

[0019] More preferably, the filler is wollastonite and mica powder in a weight ratio of 1:(0.5-1.2).

[0020] Preferably, the catalyst is nonylphenol.

[0021] Preferably, the solvent is at least one of ethyl acetate, toluene, dibutyl phthalate, ethanol, acetone and butanol.

[0022] Preferably, the epoxy resin coating further comprises at least one of a pigment, a leveling agent and a defoaming agent.

[0023] More preferably, the weight proportion of the pigment is 15-35 parts.

[0024] More preferably, the weight proportion of the leveling agent is 0.1-3 parts.

[0025] More preferably, the weight proportion of the defoaming agent is 0.5-4 parts.

[0026] Pigments, leveling agents, and defoaming agents commonly used in the art can be used in the present invention. For example, the pigment is at least one of titanium dioxide, red iron oxide, toluidine red, scarlet powder, cadmium red, molybdenum chrome orange, ultramarine, iron blue, chrome green, carbon black, and iron black; the defoaming agent is an organosilicon defoaming agent, specifically BYK-021 and the like; the leveling agent is an organosilicon leveling agent, specifically BYK-333 and the like.

[0027] In a second aspect, the present invention provides a method for preparing an epoxy resin coating, comprising the following steps:

[0028] Firstly, other components except the curing agent and the catalyst are mixed, and then the curing agent and the catalyst are added and mixed to obtain the epoxy resin coating.

[0029] In a third aspect, the present invention provides an application of epoxy resin coating in automobiles.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] The epoxy resin coating prepared by the present invention can be cured below 100° C. and still has good wear resistance and aging resistance, as shown below:

[0032] The present invention finds that when the epoxy resin coating uses 2-amino-4-sulfonamidophenol and ocpamine (hydroxyphenylethanolamine) of specific types and usage ratios as curing agents for the epoxy resin, the epoxy resin coating can promote the curing reaction of the epoxy resin at a temperature below 100° C., accelerate the curing speed, and shorten the curing time; at the same time, since 2-amino-4-sulfonamidophenol and ocpamine (hydroxyphenylethanolamine) have multiple sites for curing reaction with the epoxy resin and have rigid benzene ring groups, they can react with the epoxy resin to form a stable complex network structure, which can resist or buffer the influence of the curing temperature, so that the epoxy resin coating still has strong wear resistance and aging resistance after being cured below 100° C.

[0033] In the present invention, when a specific ratio of epoxy resin E44 and epoxy resin E51 is used, the epoxy resin cures faster at temperatures below 100°C, and the network structure formed by the epoxy resin and the curing agent is more stable and complex, so that the epoxy resin coating has a stronger ability to resist or buffer the effects of the curing temperature, and is more conducive to improving the wear resistance and aging resistance of the epoxy resin coating after curing below 100°C. DETAILED DESCRIPTION

[0034] In order to better illustrate the purpose, technical solutions and advantages of the present invention, the present invention will be further described below in conjunction with specific embodiments.

[0035] The experimental methods in the following examples and comparative examples without specifying specific conditions are generally carried out according to conventional conditions in the art or according to conditions recommended by the manufacturer; the raw materials, reagents, etc. used, unless otherwise specified, are all raw materials and reagents that can be obtained from commercial channels such as conventional markets.

[0036] In each embodiment and comparative example of the present invention, the use of reagents is as follows:

[0037] Epoxy resin E44, 6101, Baling Petrochemical;

[0038] Epoxy resin E51, EP CYD-128, Baling Petrochemical;

[0039] Wollastonite, C909735, MacLean;

[0040] Mica powder, dry process mica powder, D875287, McLean;

[0041] Pigment, titanium dioxide, T818992, McLean;

[0042] Defoamer, silicone defoamer, BYK-021, BYK;

[0043] Leveling agent, silicone leveling agent, BYK-333, BYK.

[0044] Example 1

[0045] This embodiment provides an epoxy resin coating, comprising the following components in parts by weight:

[0046] 100 parts of epoxy resin, 50 parts of curing agent, 15 parts of filler, 7 parts of catalyst nonylphenol, 30 parts of solvent ethyl acetate, 25 parts of pigment, 1.5 parts of leveling agent, 2 parts of defoaming agent;

[0047] The curing agent is 2-amino-4-sulfonamidophenol and octopamine (hydroxyphenylethanolamine) in a weight ratio of 1:1.5;

[0048] The epoxy resin is epoxy resin E44 and epoxy resin E51 in a weight ratio of 1:1;

[0049] The filler is wollastonite and mica powder in a weight ratio of 1:0.8.

[0050] The preparation method of the above-mentioned epoxy resin coating comprises the following steps:

[0051] Firstly, other components except the curing agent and the catalyst are mixed, and then the curing agent and the catalyst are added and mixed to obtain the epoxy resin coating.

[0052] Examples 2-5 and Comparative Examples 1-3

[0053] Examples 2-5 and Comparative Examples 1-3 provide different epoxy resin coatings, which differ from Example 1 in that the weight ratio of 2-amino-4-sulfonamidophenol and ocpamine is different, and the rest is consistent with Example 1, as shown in the following table:

[0054] Table 1 Weight ratio of 2-amino-4-sulfonamidophenol and octopamine in Examples 1-5 and Comparative Examples 1-3

[0055]

[0056]

[0057] Examples 6-7 and Comparative Examples 4-5

[0058] Examples 6-7 and Comparative Examples 4-5 provide different epoxy resin coatings, which differ from Example 1 in that the weight fractions of the curing agent are different, and the rest are consistent with Example 1, as shown in the following table:

[0059] Table 2 Parts by weight of curing agent in Examples 1, 6-7 and Comparative Examples 4-5

[0060] Curing agent weight parts / part Example 1 50 Example 6 40 Example 7 60 Comparative Example 4 10 Comparative Example 5 80

[0061] Embodiment 8-14

[0062] Examples 8-14 provide different epoxy resin coatings, which differ from Example 1 in that the weight ratio of epoxy resin E44 to epoxy resin E51 is different, and the rest is consistent with Example 1, as shown in the following table:

[0063] Table 3 Weight ratio of epoxy resin E44 and epoxy resin E51 in Examples 1, 8-14

[0064]

[0065] Examples 15-18 and Comparative Examples 6-7

[0066] Examples 15-18 and Comparative Examples 6-7 provide different epoxy resin coatings, which differ from Example 1 in that the weight fractions of epoxy resin are different, and the rest are consistent with Example 1, as shown in the following table:

[0067] Table 4 Weight parts of epoxy resin in Examples 1, 15-18 and Comparative Examples 6-7

[0068] Epoxy resin weight parts / part Example 1 100 Embodiment 15 90 Example 16 110 Embodiment 17 80 Embodiment 18 120 Comparative Example 6 60 Comparative Example 7 140

[0069] Examples 19-24

[0070] Examples 19-24 provide different epoxy resin coatings, which differ from Example 1 in that the weight ratios of wollastonite and mica powder in the filler are different, and the rest are consistent with Example 1, as shown in the following table:

[0071] Table 5 Weight ratio of wollastonite and mica powder in fillers of Examples 1, 19-24

[0072] Weight ratio of wollastonite and mica powder Example 1 1:0.8 Embodiment 19 1:0.5 Embodiment 20 1:1.2 Embodiment 21 1:0.1 Embodiment 22 1:1.5 Embodiment 23 1:0 Embodiment 24 0:1

[0073] Embodiment 25

[0074] This embodiment provides an epoxy resin coating, comprising the following components in parts by weight:

[0075] 80 parts of epoxy resin, 40 parts of curing agent, 10 parts of filler, 5 parts of catalyst nonylphenol, 20 parts of solvent ethyl acetate, 15 parts of pigment, 0.1 parts of leveling agent, 0.5 parts of defoaming agent;

[0076] The curing agent is 2-amino-4-sulfonamidophenol and octopamine (hydroxyphenylethanolamine) in a weight ratio of 1:1.5;

[0077] The epoxy resin is epoxy resin E44 and epoxy resin E51 in a weight ratio of 1:1;

[0078] The filler is wollastonite and mica powder in a weight ratio of 1:0.8.

[0079] The preparation method of the above-mentioned epoxy resin coating comprises the following steps:

[0080] Firstly, other components except the curing agent and the catalyst are mixed, and then the curing agent and the catalyst are added and mixed to obtain the epoxy resin coating.

[0081] Embodiment 26

[0082] This embodiment provides an epoxy resin coating, comprising the following components in parts by weight:

[0083] 120 parts of epoxy resin, 60 parts of curing agent, 20 parts of filler, 10 parts of catalyst nonylphenol, 40 parts of solvent ethyl acetate, 35 parts of pigment, 3 parts of leveling agent, 4 parts of defoamer;

[0084] The curing agent is 2-amino-4-sulfonamidophenol and octopamine (hydroxyphenylethanolamine) in a weight ratio of 1:1.5;

[0085] The epoxy resin is epoxy resin E44 and epoxy resin E51 in a weight ratio of 1:1;

[0086] The filler is wollastonite and mica powder in a weight ratio of 1:0.8.

[0087] The preparation method of the above-mentioned epoxy resin coating comprises the following steps:

[0088] Firstly, other components except the curing agent and the catalyst are mixed, and then the curing agent and the catalyst are added and mixed to obtain the epoxy resin coating.

[0089] Comparative Example 8

[0090] This comparative example provides an epoxy resin coating, comprising the following components in parts by weight:

[0091] 100 parts of epoxy resin, 50 parts of curing agent, 15 parts of filler, 7 parts of catalyst nonylphenol, 30 parts of solvent ethyl acetate, 25 parts of pigment, 1.5 parts of leveling agent, 2 parts of defoaming agent;

[0092] The curing agent is 2-amino-4-sulfonamidophenol and 4-hydroxybenzylamine in a weight ratio of 1:1.5;

[0093] The epoxy resin is epoxy resin E44 and epoxy resin E51 in a weight ratio of 1:1;

[0094] The filler is wollastonite and mica powder in a weight ratio of 1:0.8.

[0095] The preparation method of the above-mentioned epoxy resin coating comprises the following steps:

[0096] Firstly, other components except the curing agent and the catalyst are mixed, and then the curing agent and the catalyst are added and mixed to obtain the epoxy resin coating.

[0097] Performance Testing

[0098] The performance tests of the epoxy resin coatings of the embodiments and comparative examples are as follows:

[0099] 1. Wear resistance test:

[0100] 35g of the epoxy resin coating of each embodiment or comparative example was coated on a 50mm*50mm*2mm tinplate plane and cured at 60°C for 8h to obtain a test sample; then, the test sample was subjected to a wear resistance test according to GB / T 1768-2006. Specifically, under the conditions of a rubber grinding wheel load of 1000g and a test rotation number of 1000 revolutions, the wear mass of the epoxy resin coating was measured (accurate to 0.1mg). The greater the wear mass, the worse the wear resistance of the epoxy resin coating;

[0101] 2. Aging resistance test:

[0102] 35g of the epoxy resin coating of each embodiment or comparative example was coated on a 50mm*50mm*2mm tinplate plane, and cured at 60°C for 8h to obtain a test sample; then, the test was performed for 900h according to method B of GB / T 23987-2009, and the aging resistance of the epoxy resin coating was graded according to Table 23 "Evaluation of comprehensive aging performance grade of protective paint film" of GB / T 1766-2008, and the larger the grade, the worse the aging resistance of the epoxy resin coating;

[0103] 3. Adhesion test:

[0104] 35 g of the epoxy resin coating of each embodiment or comparative example was applied on a 50 mm*50 mm*2 mm tinplate plane and cured at 60° C. for 8 h to obtain a test sample; then, the test sample was subjected to an adhesion test according to GB / T 9286-2021. The greater the adhesion level, the worse the adhesion of the epoxy resin coating;

[0105] 4. Pencil hardness test:

[0106] 35g of the epoxy resin coating of each embodiment or comparative example was coated on a 50mm*50mm*2mm tinplate plane and cured at 60°C for 8h to obtain a test sample; then a pencil hardness test was performed on the test sample according to GB / T 6739-2006, and the greater the pencil hardness, the greater the hardness of the epoxy resin coating;

[0107] The experimental results are shown in the following table:

[0108] Table 6 Performance test results of water-based coatings in various embodiments and comparative examples

[0109]

[0110]

[0111]

[0112] It can be seen from Table 6 that the epoxy resin coating prepared by the present invention can be cured below 100°C and still has good wear resistance and aging resistance, as follows:

[0113] The present invention finds that when the epoxy resin coating uses 2-amino-4-sulfonamidophenol and ocpamine (hydroxyphenylethanolamine) of specific types and usage ratios as curing agents for the epoxy resin, the epoxy resin coating can promote the curing reaction of the epoxy resin at a temperature below 100° C., accelerate the curing speed, and shorten the curing time; at the same time, since 2-amino-4-sulfonamidophenol and ocpamine (hydroxyphenylethanolamine) have multiple sites for curing reaction with the epoxy resin and have rigid benzene ring groups, they can react with the epoxy resin to form a stable complex network structure, which can resist or buffer the influence of the curing temperature, so that the epoxy resin coating still has strong wear resistance and aging resistance after being cured below 100° C.

[0114] It can be seen from Examples 1 and 8-14 that in the present invention, when a specific ratio of epoxy resin E44 and epoxy resin E51 is used, the epoxy resin cures faster at temperatures below 100°C, and the network structure formed with the curing agent is more stable and complex, making the epoxy resin coating more capable of resisting or buffering the effects of the curing temperature, and is more conducive to improving the wear resistance and aging resistance of the epoxy resin coating after curing below 100°C.

[0115] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. An epoxy resin coating, characterized in that: The composition comprises the following components in parts by weight: Epoxy resin 80-120 parts, curing agent 40-60 parts, filler 10-20 parts, catalyst 5-10 parts, solvent 20-40 parts; The curing agent is 2-amino-4-sulfonamidophenol and octanoic acid amine in a weight ratio of 1: (0.5-2.5).

2. The epoxy resin coating according to claim 1, characterized in that: The weight ratio of the 2-amino-4-sulfonamidophenol to ocpamine is 1:(1-2).

3. The epoxy resin coating according to claim 1, characterized in that: The weight proportion of the epoxy resin is 90-110 parts.

4. The epoxy resin coating according to claim 1, characterized in that: Including at least one of the following (1)-(2); (1) The epoxy resin is at least one of epoxy resin E44 and epoxy resin E51; (2) The filler is at least one of wollastonite, bentonite, barium sulfate, calcium carbonate, mica powder and talc powder.

5. The epoxy resin coating according to claim 4, characterized in that: Including at least one of the following (1)-(2); (1) The epoxy resin is epoxy resin E44 and epoxy resin E51 in a weight ratio of 1:(0.1-2); (2) The filler is wollastonite and mica powder in a weight ratio of 1: (0.1-1.5).

6. The epoxy resin coating according to claim 5, characterized in that: Including at least one of the following (1)-(2); (1) The epoxy resin is epoxy resin E44 and epoxy resin E51 in a weight ratio of 1:(0.5-1.5); (2) The filler is wollastonite and mica powder in a weight ratio of 1: (0.5-1.2).

7. The epoxy resin coating according to claim 1, characterized in that: Including at least one of the following (1)-(3); (1) The catalyst is nonylphenol; (2) The solvent is at least one of ethyl acetate, toluene, dibutyl phthalate, ethanol, acetone, and butanol; (3) The epoxy resin coating further comprises at least one of a pigment, a leveling agent and a defoaming agent.

8. The epoxy resin coating according to claim 7, characterized in that: Including at least one of the following (1)-(3); (1) The weight proportion of the pigment is 15-35 parts; (2) The weight proportion of the leveling agent is 0.1-3 parts; (3) The weight proportion of the defoaming agent is 0.5-4 parts.

9. A method for preparing the epoxy resin coating according to any one of claims 1 to 8, characterized in that: The steps include: Firstly, other components except the curing agent and the catalyst are mixed, and then the curing agent and the catalyst are added and mixed to obtain the epoxy resin coating.

10. Use of the epoxy resin coating according to any one of claims 1 to 8 in automobiles.

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