Modified epoxy resin, preparation method thereof and antibacterial coating material for decorative plate

Abstract

The invention relates to modified epoxy resin, a preparation method thereof and an antibacterial coating material for a decorative plate, in particular to modified epoxy resin which is characterized by being prepared by mixing a modifier and epoxy resin, the modifier is prepared by mixing 1, 3, 5-tris (carboxymethyl) benzene, malonic acid and acetone, and the modifier and the epoxy resin are mixed to obtain the modified epoxy resin. Adding bisphenol A diglycidyl ether and an initiator, and heating to react; the modified epoxy resin is used for preparing the antibacterial coating material for the decorative plate, and the antibacterial coating material for the decorative plate is characterized by comprising the following components in parts by weight: 20-35 parts of modified epoxy resin, 3-8 parts of a diluent, 2-4 parts of a dispersing agent, 2-4 parts of a defoaming agent, 2-4 parts of titanium dioxide, 2-4 parts of cuprous oxide and 20-30 parts of ethanol.

Description

Technical Field

[0001] The invention belongs to the technical field of coating materials, and in particular relates to a modified epoxy resin, a preparation method thereof and an antibacterial coating material for a decorative plate. Background Art

[0002] Epoxy resin is widely used in the field of coatings due to its good adhesion, chemical resistance and processability. However, the micropores or microcracks formed in the curing process of epoxy resin may serve as penetration channels for corrosive media such as water, oxygen, and chloride ions, causing corrosion at the interface between the coating and the metal, thereby causing the coating to peel off and blister. In the prior art, materials such as graphene, boron nitride and MX are added to solve the above problems.

[0003] For example, CN113429859A discloses a functionalized mesoporous silica modified epoxy resin coating and a preparation method thereof, wherein the coating uses functionalized mesoporous silica as a filler and is blended and modified with epoxy resin to obtain a functionalized mesoporous silica modified epoxy resin coating. Although the method described in the patent has a physical barrier effect, it is not suitable for large-scale commercial production due to its high preparation cost, so it is necessary to develop a new modified epoxy resin coating for decorative panels. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a modified epoxy resin, a preparation method thereof and an antibacterial coating material for decorative panels.

[0005] To achieve the purpose of the present invention, the present invention provides a modified epoxy resin on one hand, which is prepared by mixing a modifier with an epoxy resin, wherein the preparation method of the modifier is to mix 1,3,5-tri(carboxymethyl)benzene, malonic acid and acetone, add bisphenol A diglycidyl ether and an initiator, and heat the reaction.

[0006] Preferably, the mass ratio of the modifier to the epoxy resin is (0.8-1):10.

[0007] Preferably, the initiator is triphenylphosphine.

[0008] Preferably, the reaction temperature of the heating reaction is 100°C to 140°C.

[0009] Preferably, the molar ratio of 1,3,5-tri(carboxymethyl)benzene, malonic acid and bisphenol A diglycidyl ether is 2:2:1.

[0010] In some preferred embodiments, the present invention provides an antibacterial coating material for decorative panels, characterized in that it comprises, by weight: 20-35 parts of the above-mentioned modified epoxy resin, 3-8 parts of a diluent, 2-4 parts of a dispersant, 2-4 parts of a defoaming agent, 2-4 parts of titanium dioxide, 2-4 parts of cuprous oxide, and 20-30 parts of ethanol.

[0011] In some preferred embodiments, the present invention provides an antibacterial coating material for decorative panels, characterized in that it comprises, by weight: 20-30 parts of the above-mentioned modified epoxy resin, 3-6 parts of a diluent, 2-4 parts of a dispersant, 2-4 parts of a defoaming agent, 2-3 parts of titanium dioxide, 2-3 parts of cuprous oxide, and 20-25 parts of ethanol.

[0012] In some preferred embodiments, the present invention provides an antibacterial coating material for decorative panels, characterized in that, in parts by weight, it comprises: 25 parts of the above-mentioned modified epoxy resin, 5 parts of diluent, 3 parts of dispersant, 3 parts of defoaming agent, 3 parts of titanium dioxide, 2 parts of cuprous oxide, and 25 parts of ethanol.

[0013] In some preferred embodiments, the diluent described in the present invention is dipropylene glycol methyl ether.

[0014] In some preferred embodiments, the dispersant described in the present invention is hydroxypropyl methylcellulose.

[0015] In some preferred embodiments, the defoamer described in the present invention is DF-89 water-based coating defoamer.

[0016] The present invention also provides a method for preparing an antibacterial coating material for a decorative plate, comprising: 1) Mix 4-8g of the above modifier with 40-60g of epoxy resin, and stir at 50-70°C for 2-3 hours to obtain a modified epoxy resin; 2) Weigh the modified epoxy resin, diluent, dispersant, defoamer, titanium dioxide, cuprous oxide, and ethanol according to the above weight percentages; 3) Add the modified epoxy resin, diluent and defoamer into the mixer for mixing and stirring at a speed of 600-700r / min for 30-40min; 4) Add dispersant, titanium dioxide, cuprous oxide, wetting agent and ethanol, stir at a speed of 300-400 r / min, stir for 10-20 min, and after stirring, obtain an antibacterial coating material for decorative panels.

[0017] Compared with the prior art, the present invention has the following beneficial effects: The inventors of the present invention have found that the antibacterial coating material for decorative panels of the present invention improves the impact resistance and adhesion of epoxy resin by modifying the epoxy resin, and has good antibacterial properties. DETAILED DESCRIPTION

[0018] The following representative examples are intended to better illustrate the present invention, but are not intended to limit the scope of the present invention. Unless otherwise specified, the materials used in the following examples were commercially available.

[0019] Sources of some raw materials: Epoxy resin was purchased from Shanghai MacLean Biochemical Technology Co., Ltd.

[0020] The above raw material manufacturer models are only specifically selected to support the raw materials in the embodiments and are adopted in the experiments. In the actual production and preparation process, the sources of raw materials are not limited to the above manufacturer models.

[0021] Mix 1,3,5-tri(carboxymethyl)benzene (15.1 g), malonic acid (6.2 g) and acetone (200 ml), add bisphenol A diglycidyl ether (10.21 g) and triphenylphosphine (0.4 g), start stirring and heat at 120°C for 10 hours, filter, wash the filter cake with ethyl acetate, and vacuum dry to obtain a modifier.

[0022] Embodiment 1: An antibacterial coating material for decorative panels, characterized in that, in parts by weight, it comprises: 25 parts of the above-mentioned modified epoxy resin, 5 parts of diluent, 3 parts of dispersant, 3 parts of defoamer, 3 parts of titanium dioxide, 2 parts of cuprous oxide, and 25 parts of ethanol, and its preparation method comprises: 1) 5 g of the above modifier was mixed with 50 g of epoxy resin and stirred at 60° C. for 3 hours to obtain a modified epoxy resin; 2) Weigh the modified epoxy resin, diluent, dispersant, defoamer, titanium dioxide, cuprous oxide, and ethanol according to the above weight percentages; 3) Add the modified epoxy resin, diluent and defoamer into the mixer for mixing and stirring at a speed of 600 r / min for 30 min; 4) adding dispersant, titanium dioxide, cuprous oxide, wetting agent and ethanol, stirring at a speed of 300 r / min for 10 min, and completing the stirring to obtain an antibacterial coating material for decorative panels.

[0023] Embodiment 2: An antibacterial coating material for decorative panels, characterized in that, in parts by weight, it comprises: 20 parts of the above-mentioned modified epoxy resin, 5 parts of diluent, 3 parts of dispersant, 3 parts of defoamer, 3 parts of titanium dioxide, 3 parts of cuprous oxide, and 20 parts of ethanol, and its preparation method comprises: 1) 4 g of the above modifier was mixed with 50 g of epoxy resin and stirred at 60° C. for 3 hours to obtain a modified epoxy resin; 2) Weigh the modified epoxy resin, diluent, dispersant, defoamer, titanium dioxide, cuprous oxide, and ethanol according to the above weight percentages; 3) Add the modified epoxy resin, diluent and defoamer into the mixer for mixing and stirring at a speed of 700 r / min for 40 min; 4) adding dispersant, titanium dioxide, cuprous oxide, wetting agent and ethanol, stirring at a speed of 400 r / min for 20 min, and completing stirring to obtain an antibacterial coating material for decorative panels.

[0024] Embodiment 3: An antibacterial coating material for decorative panels, characterized in that, in parts by weight, it comprises: 30 parts of the above-mentioned modified epoxy resin, 5 parts of diluent, 2 parts of dispersant, 4 parts of defoamer, 3 parts of titanium dioxide, 3 parts of cuprous oxide, and 30 parts of ethanol, and its preparation method comprises: 1) 7 g of the above modifier was mixed with 60 g of epoxy resin and stirred at 70° C. for 3 hours to obtain a modified epoxy resin; 2) Weigh the modified epoxy resin, diluent, dispersant, defoamer, titanium dioxide, cuprous oxide, and ethanol according to the above weight percentages; 3) Add the modified epoxy resin, diluent and defoamer into the mixer for mixing and stirring at a speed of 700 r / min for 40 min; 4) adding dispersant, titanium dioxide, cuprous oxide, wetting agent and ethanol, stirring at a speed of 400 r / min for 20 min, and completing stirring to obtain an antibacterial coating material for decorative panels.

[0025] Embodiment 4: An antibacterial coating material for decorative panels, characterized in that, in parts by weight, it comprises: 30 parts of the above-mentioned modified epoxy resin, 5 parts of diluent, 3 parts of dispersant, 3 parts of defoamer, 3 parts of titanium dioxide, 3 parts of cuprous oxide, and 25 parts of ethanol, and its preparation method comprises: 1) 6 g of the above modifier was mixed with 40 g of epoxy resin and stirred at 70° C. for 2 hours to obtain a modified epoxy resin; 2) Weigh the modified epoxy resin, diluent, dispersant, defoamer, titanium dioxide, cuprous oxide, and ethanol according to the above weight percentages; 3) Add the modified epoxy resin, diluent and defoamer into the mixer for mixing and stirring at a speed of 700 r / min for 40 min; 4) adding dispersant, titanium dioxide, cuprous oxide, wetting agent and ethanol, stirring at a speed of 400 r / min for 20 min, and completing stirring to obtain an antibacterial coating material for decorative panels.

[0026] An antibacterial coating material for decorative panels, characterized in that, in parts by weight, it includes: 25 parts of epoxy resin, 5 parts of diluent, 3 parts of dispersant, 3 parts of defoaming agent, 1 part of titanium dioxide, and 25 parts of ethanol. Its preparation method includes: weighing the above components respectively according to the above weight percentages, adding them into a blender for mixing and stirring, the speed is 600r / min, the stirring time is 30min, and the antibacterial coating material for decorative panels is obtained.

[0027] The decorative panels prepared in Examples 1 to 4 and Comparative Example 1 were subjected to performance tests using antibacterial coating materials.

[0028] (1) Adhesion (pull-off method): test standard GB / T 5219-2006; (2) Impact resistance: test standard GB / T 1732-2020; (3) Antibacterial properties: Test standard GB / T21866-2008.

[0029] Table 1 Performance test results Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Adhesion (MPa) 20.9 20.8 19.0 19.4 16.3 Impact resistance (cm) 52 52 51 51 48 Antibacterial rate against Escherichia coli 99.9% 99.9% 99.9% 99.9% 98.0% Antibacterial rate against Staphylococcus aureus 99.9% 99.9% 99.9% 99.9% 98.0% Therefore, compared with the comparative example, the antibacterial coating material for decorative panels of the present invention has good impact resistance, good adhesion and excellent antibacterial performance.

[0030] Although the present invention has been described in detail above, it is understood by those skilled in the art that various modifications and changes can be made to the present invention without departing from the spirit and scope of the present invention. The invention is not restricted by the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principle of the present invention shall be equivalent replacement methods and shall be included in the protection scope of the present invention.

Claims

1. A modified epoxy resin, characterized in that: The invention is prepared by mixing a modifier with an epoxy resin, wherein the preparation method of the modifier is as follows: 1,3,5-tri(carboxymethyl)benzene, malonic acid and acetone are mixed, bisphenol A diglycidyl ether and an initiator are added, and the mixture is heated for reaction.

2. A modified epoxy resin according to claim 1, characterized in that: The mass ratio of the modifier to the epoxy resin is (0.8-1):

10.

3. A modified epoxy resin according to claim 1, characterized in that: The initiator is triphenylphosphine.

4. A modified epoxy resin according to claim 1, characterized in that: The reaction temperature of the heating reaction is 100°C to 140°C.

5. A modified epoxy resin according to claim 1, characterized in that: The molar ratio of the 1,3,5-tri(carboxymethyl)benzene, malonic acid and bisphenol A diglycidyl ether is 2:2:

1.

6. An antibacterial coating material for decorative panels, characterized in that: In parts by weight, it comprises: 20-35 parts of the modified epoxy resin according to any one of claims 1-6, 3-8 parts of a diluent, 2-4 parts of a dispersant, 2-4 parts of a defoaming agent, 2-4 parts of titanium dioxide, 2-4 parts of cuprous oxide, and 20-30 parts of ethanol.

7. The antibacterial coating material for decorative panels according to claim 6, characterized in that: In parts by weight, it comprises: 25 parts of the modified epoxy resin according to any one of claims 1 to 6, 5 parts of a diluent, 3 parts of a dispersant, 3 parts of a defoaming agent, 3 parts of titanium dioxide, 2 parts of cuprous oxide, and 25 parts of ethanol.

8. The antibacterial coating material for decorative panels according to claim 6, characterized in that: The diluent is dipropylene glycol methyl ether, the dispersant is hydroxypropyl methylcellulose, and the defoamer is DF-89 water-based paint defoamer.

9. The method for preparing the antibacterial coating material for decorative panels according to claim 6, comprising: 1) Mix 4-8 g of the modifier prepared according to claim 1 with 40-60 g of epoxy resin, and stir at 50-70° C. for 2-3 hours to prepare a modified epoxy resin; 2) Weigh the modified epoxy resin, diluent, dispersant, defoamer, titanium dioxide, cuprous oxide, and ethanol prepared in step 1) according to the weight percentages described in claim 6; 3) Add the modified epoxy resin, diluent and defoamer into the mixer for mixing and stirring at a speed of 600-700r / min for 30-40min; 4) Add dispersant, titanium dioxide, cuprous oxide, wetting agent and ethanol, stir at a speed of 300-400 r / min, stir for 10-20 min, and after stirring, obtain an antibacterial coating material for decorative panels.