A kind of flexible weather-resistant epoxy coating containing diisocyanate and preparation method thereof

Abstract

The present invention belongs to the technical field of architectural coatings, and provides a flexible weather-resistant epoxy coating containing diisocyanate and its application. The present invention adopts polyurethane-modified epoxy resin instead of hydrogenated epoxy resin, thereby increasing the flexibility of component A and reducing the cost of raw materials. Meanwhile, component B adopts alicyclic amine, polyether amine and epoxy accelerator, thereby further improving the weather resistance of epoxy coating and reducing the cost of epoxy coating.

Description

Technical Field

[0001] The invention relates to the technical field of waterproof coatings and discloses a flexible weather-resistant epoxy coating containing diisocyanate and a preparation method thereof. Background Art

[0002] With the progress of the times, the demand for multifunctional coatings has gradually increased, for example, antibacterial waterproof coatings, flame retardant waterproof coatings, aging-resistant waterproof coatings and anti-corrosion waterproof coatings, heat-reflecting heat-insulating coatings, etc. Among them, epoxy coatings are usually obtained by reacting two-component A component and B component, and A component is composed of epoxy resin (such as bisphenol A resin and bisphenol F resin), active diluent, coupling agent, pigment, filler and some additives; amine curing agent constitutes B component of epoxy coating. Ordinary epoxy resins contain benzene rings in their molecular structure, and are usually used in the field of coatings. The weather resistance is poor. Even in occasions where weather resistance requirements are not high, such as below the water level change zone (external positions in hydraulic structures that are often soaked in water), daily sunlight exposure is also prone to yellowing and aging. In order to solve this problem, hydrogenated bisphenol A resins (such as EP-4080 resins) are usually used to replace ordinary epoxy resins, and react with aliphatic or alicyclic curing agents, but such a two-component formula usually leads to obvious brittleness of epoxy cured products, and the cost of raw materials is high, which is not conducive to the promotion and use of products.

[0003] Sometimes, in order to solve the disadvantage of the lack of flexibility of the cured product, polythiol curing agent and polyetheramine curing agent are also used. Because the polythiol curing agent has a thiol group, the coating will emit an unpleasant odor during the construction and maintenance process, and it is easy to pollute the surrounding environment, which cannot meet the requirements of green environmental protection and is not conducive to the promotion and use of the product; the polyetheramine curing agent is not highly active at room temperature and is suitable for use under medium temperature conditions (usually heated to 80-130°C), and the water resistance of the cured product is not good enough, and it is not suitable for large-scale use in the field of hydraulic structures that usually require cold construction. Therefore, it is necessary to study an epoxy coating that is both weather-resistant and flexible. Summary of the invention

[0004] The following is a summary of some aspects of the present invention, but is not intended to limit the present invention. When there is a discrepancy between the disclosure of this specification and the referenced document, the disclosure of this specification shall prevail.

[0005] The purpose of the present invention is to provide a flexible weather-resistant epoxy coating and its application. The epoxy coating provided by the present invention has both flexibility and weather resistance.

[0006] A flexible weather-resistant epoxy coating containing diisocyanate, comprising independently packaged component A and component B;

[0007] The A component includes the following components in percentage by weight:

[0008] Polyurethane modified epoxy resin 60-80%, active diluent 7-15%, silane coupling agent 1-5%, carbon black 0.10-0.15%, titanium dioxide 4-4.5%, weather-resistant filler 5-8%, defoamer 0.5-0.8%, dispersant 0.3-0.5%;

[0009] The B component includes the following components in percentage by mass:

[0010] Alicyclic amine 70-80%, epoxy accelerator 1-3%, polyether amine 15-30%.

[0011] Furthermore, the mass ratio of component A to component B is 100:(10-15).

[0012] Furthermore, the polyurethane modified epoxy resin is obtained by copolymerizing a polyurethane prepolymer, bisphenol A resin and bisphenol F resin; and the polyurethane prepolymer is obtained by copolymerizing a diisocyanate, polypropylene glycol PPG400 and polypropylene glycol PPG1000.

[0013] A flexible weather-resistant epoxy coating containing diisocyanate, comprising independently packaged component A and component B; the mass ratio of component A to component B is 100:12;

[0014] The A component includes the following components in percentage by weight:

[0015] Polyurethane modified epoxy resin 75%, active diluent 12%, silane coupling agent 2%, carbon black 0.1%, titanium dioxide 4%, weather-resistant filler 6%, defoamer 0.5%, dispersant 0.4%;

[0016] The B component includes the following components in percentage by mass:

[0017] Alicyclic amine 75%, epoxy accelerator 2%, polyether amine 23%;

[0018] The polyurethane modified epoxy resin is obtained by copolymerizing a polyurethane prepolymer, a bisphenol A resin and a bisphenol F resin, wherein the mass ratio of the polyurethane prepolymer to the bisphenol A resin and the bisphenol F resin is 5:1:1; and the polyurethane prepolymer is obtained by copolymerizing a diisocyanate, polypropylene glycol PPG400 and polypropylene glycol PPG1000.

[0019] Furthermore, the diisocyanate is selected from one or more of 4,4'-diisocyanate dicyclohexylmethane, dicyclohexylmethane diisocyanate, 1,4-cyclohexane diisocyanate, isophorone diisocyanate, and hexamethylene diisocyanate.

[0020] Furthermore, the mass ratio of the diisocyanate to polypropylene glycol PPG400 and polypropylene glycol PPG1000 is 1:(3-8):(3-8), and preferably the mass ratio of the diisocyanate to polypropylene glycol PPG400 and polypropylene glycol PPG1000 is 1:5:4.

[0021] Furthermore, the diisocyanate is dicyclohexylmethane diisocyanate and hexamethylene diisocyanate, wherein the mass ratio of dicyclohexylmethane diisocyanate to hexamethylene diisocyanate is 2 to 6:1, and more preferably the mass ratio of dicyclohexylmethane diisocyanate to hexamethylene diisocyanate is 3:1.

[0022] Furthermore, the bisphenol A resin preferably includes Nan Ya NPEL-128 bisphenol A resin; and the bisphenol F resin is preferably NPEL-170 bisphenol F resin produced by Kunshan Nan Ya.

[0023] Furthermore, the active diluent is 1,6-hexanediol diacrylate; the silane coupling agent is vinyl triethoxysilane; and the weather-resistant filler is quartz.

[0024] Furthermore, the defoamer includes an organosilicon defoamer and a non-silicon defoamer; the organosilicon defoamer is preferably Euka P-570 defoamer; the non-silicon defoamer is preferably Euka 590 defoamer; the mass ratio of the organosilicon defoamer to the non-silicon defoamer is 2:1.

[0025] Furthermore, the dispersant preferably includes Euka 680U dispersant and Euka 730U dispersant, and the mass ratio of the Euka 730U dispersant to the Euka 680U dispersant is preferably 2:3.

[0026] Furthermore, the alicyclic amine preferably includes o-diaminomethylcyclopentane (TDC-850) and isophoronediamine (IPDA), and the mass ratio of o-diaminomethylcyclopentane (TDC-850) to isophoronediamine (IPDA) is preferably 3:1; the epoxy accelerator is preferably 2,4,6-tris(dimethylaminomethyl)phenol (DMP-30 or K54); and the polyetheramine is Huntsman D2000.

[0027] In the present invention, a method for preparing a flexible weather-resistant epoxy coating containing diisocyanate preferably comprises the following steps:

[0028] (1) first mixing a polyurethane modified epoxy resin, a reactive diluent, a silane coupling agent, carbon black, titanium dioxide, a weather-resistant filler, a defoaming agent and a dispersant to obtain a component A;

[0029] (2) performing a second mixing of the alicyclic amine, the epoxy accelerator and the polyether amine to obtain a component B;

[0030] (3) After obtaining component A and component B, the present invention places component A and component B independently. When they are needed, component A and component B are stirred and mixed according to a mass ratio and then applied.

[0031] Beneficial technical effects of the present invention

[0032] Compared with the prior art, the technical solution of the present invention has the following advantages:

[0033] 1. The present invention adopts polyurethane modified epoxy resin instead of hydrogenated epoxy resin, which increases the flexibility of component A and reduces the cost of raw materials. At the same time, component B adopts alicyclic amine, polyether amine and epoxy accelerator, wherein alicyclic amine makes epoxy coating have good weather resistance, polyether amine further improves the flexibility of epoxy coating, and an appropriate amount of epoxy accelerator shortens the surface drying time of epoxy coating and improves construction efficiency. DETAILED DESCRIPTION

[0034] Unless otherwise indicated or there is an obvious conflict in the context, all technical and scientific terms used herein have the same meaning as those generally understood by those of ordinary skill in the art to which the invention belongs. If there is a conflict, the definitions provided in the application shall prevail. When a trade name appears in this article, it is intended to refer to the corresponding commodity or its active ingredient. All patents, published patent applications and publications cited herein are incorporated herein by reference.

[0035] Embodiment 1:

[0036] A flexible weather-resistant epoxy coating containing diisocyanate, comprising independently packaged component A and component B; the mass ratio of component A to component B is 100:12;

[0037] The A component includes the following components in percentage by weight:

[0038] Polyurethane modified epoxy resin 75%, active diluent 12%, silane coupling agent 2%, carbon black 0.1%, titanium dioxide 4%, weather-resistant filler 6%, defoamer 0.5%, dispersant 0.4%;

[0039] The B component includes the following components in percentage by mass:

[0040] Alicyclic amine 75%, epoxy accelerator 2%, polyether amine 23%;

[0041] The polyurethane modified epoxy resin is obtained by copolymerizing a polyurethane prepolymer, a bisphenol A resin and a bisphenol F resin, wherein the mass ratio of the polyurethane prepolymer to the bisphenol A resin and the bisphenol F resin is 5:1:1; and the polyurethane prepolymer is obtained by copolymerizing a diisocyanate, polypropylene glycol PPG400 and polypropylene glycol PPG1000.

[0042] The mass ratio of the diisocyanate to dicyclohexylmethane diisocyanate and hexamethylene diisocyanate is 3:1; the mass ratio of the diisocyanate to polypropylene glycol PPG400 and polypropylene glycol PPG1000 is 1:5:4; the bisphenol A resin is preferably Nan Ya NPEL-128 bisphenol A resin; the bisphenol F resin is NPEL-170 bisphenol F resin produced by Kunshan Nan Ya; the active diluent is 1,6-hexanediol diacrylate; the silane coupling agent is preferably 1,6-hexanediol diacrylate; the silane coupling agent is preferably 1,6-hexanediol diacrylate; the bisphenol A resin ... The agent is vinyl triethoxysilane; the weather-resistant filler is quartz; the defoaming agent includes a silicone defoaming agent and a non-silicon defoaming agent, the silicone defoaming agent is preferably Euka P-570 defoaming agent, and the non-silicon defoaming agent is preferably Euka 590 defoaming agent, and the mass ratio of the silicone defoaming agent and the non-silicon defoaming agent is 2:1; the dispersant preferably includes Euka 680U dispersant and Euka 730U dispersant, and the mass ratio of the Euka 730U dispersant to the Euka 680U dispersant is preferably 2:3.

[0043] In addition, the alicyclic amine preferably includes o-diaminomethylcyclopentane (TDC-850) and isophoronediamine (IPDA), and the mass ratio of o-diaminomethylcyclopentane (TDC-850) and isophoronediamine (IPDA) is preferably 3:1; the epoxy accelerator is preferably 2,4,6-tris(dimethylaminomethyl)phenol (DMP-30 or K54); and the polyetheramine is Huntsman D2000.

[0044] In the present invention, a method for preparing a flexible weather-resistant epoxy coating containing diisocyanate preferably comprises the following steps:

[0045] (1) first mixing a polyurethane modified epoxy resin, a reactive diluent, a silane coupling agent, carbon black, titanium dioxide, a weather-resistant filler, a defoaming agent and a dispersant to obtain a component A;

[0046] (2) performing a second mixing of the alicyclic amine, the epoxy accelerator and the polyether amine to obtain a component B;

[0047] (3) After obtaining component A and component B, the present invention places component A and component B independently. When they are needed, component A and component B are stirred and mixed at a mass ratio of 100:12, and then applied.

[0048] Performance Test:

[0049] Preparation of flexible weather-resistant epoxy coating: Component A and component B are mixed at a mass ratio of 100:12, stirred at 1400 rpm for 4 minutes at room temperature to obtain a flexible weather-resistant epoxy coating, and the following tests are performed:

[0050] 1. Tensile properties of room temperature air curing: dumbbell I-type specimens were prepared according to the provisions of GB / T 528-2009, and the specimens were cured in an environment with room temperature (23±2)℃ and humidity (50±10)%. After 7 days, the tensile properties were tested to be 13MPa and the elongation at break was 80%; after 28 days, the tensile properties were tested, the tensile strength was 25MPa, and the elongation at break was 45%;

[0051] 2. Bonding strength: Test the bonding strength according to the method specified in 7.9 of JC / T 2217-2014. The samples were prepared in the following ways: ① The dry base surface was not coated with Gumid epoxy interface agent, but directly coated with flexible weather-resistant epoxy coating, and the following three methods were adopted for curing: a. Soak in room temperature water for 28 days after 7 days of air curing at room temperature; b. Soak in room temperature water for 28 days after 21 days of air curing at room temperature; c. Soak in room temperature water for 7 days after 21 days of air curing at room temperature; c. Soak in room temperature air curing at room temperature for 7 days. ② The dry base surface was coated with Gumid epoxy interface agent, and flexible weather-resistant epoxy coating was applied after the interface agent was dry, and the same three methods were adopted for curing. During the above process, the coating on the sample block did not peel, crack or peel off. The bonding strength was tested by pulling, and the data are shown in Table 1.

[0052] Table 1 Adhesion strength test results

[0053]

[0054] It can be seen from Table 1 that no matter what kind of brushing and curing method is adopted, the obtained flexible weather-resistant epoxy coating has good bonding strength, which is greater than the 2.5MPa specified by the national standard.

[0055] 3. Weather resistance: The samples above were made under the same conditions and air-cured at room temperature for 7 days, including those coated with Gumid epoxy interface agent and those directly coated with flexible weather-resistant epoxy coating. After 720 hours of artificial weather aging, there was no powdering and yellowing, indicating good weather resistance.

[0056] 4. According to the tests on the coating's anti-seepage pressure, frost resistance, chemical resistance (acid resistance, alkali resistance, salt resistance) and impact resistance in JC / T 2217-2014, the coating has no cracking, peeling or flaking.

[0057] Embodiment 2:

[0058] A flexible weather-resistant epoxy coating containing diisocyanate, comprising independently packaged component A and component B; the mass ratio of component A to component B is 100:12;

[0059] The A component includes the following components in percentage by weight:

[0060] Polyurethane modified epoxy resin 67%, active diluent 15%, silane coupling agent 5%, carbon black 0.1%, titanium dioxide 4%, weather-resistant filler 8%, defoamer 0.5%, dispersant 0.4%;

[0061] The B component includes the following components in percentage by mass:

[0062] Alicyclic amine 80%, epoxy accelerator 1%, polyether amine 19%;

[0063] The polyurethane modified epoxy resin is obtained by copolymerizing a polyurethane prepolymer, a bisphenol A resin and a bisphenol F resin, wherein the mass ratio of the polyurethane prepolymer to the bisphenol A resin and the bisphenol F resin is 5:1:1; and the polyurethane prepolymer is obtained by copolymerizing a diisocyanate, polypropylene glycol PPG400 and polypropylene glycol PPG1000.

[0064] The mass ratio of the diisocyanate to dicyclohexylmethane diisocyanate and hexamethylene diisocyanate is 4:1; the mass ratio of the diisocyanate to polypropylene glycol PPG400 and polypropylene glycol PPG1000 is 1:5:5; the bisphenol A resin is preferably Nan Ya NPEL-128 bisphenol A resin; the bisphenol F resin is NPEL-170 bisphenol F resin produced by Kunshan Nan Ya; the active diluent is 1,6-hexanediol diacrylate; the silane coupling agent is preferably 1,6-hexanediol diacrylate; the silane coupling agent is preferably 1,6-hexanediol diacrylate; the bisphenol A resin ... The agent is vinyl triethoxysilane; the weather-resistant filler is quartz; the defoaming agent includes a silicone defoaming agent and a non-silicon defoaming agent, the silicone defoaming agent is preferably Euka P-570 defoaming agent, and the non-silicon defoaming agent is preferably Euka 590 defoaming agent, and the mass ratio of the silicone defoaming agent and the non-silicon defoaming agent is 2:1; the dispersant preferably includes Euka 680U dispersant and Euka 730U dispersant, and the mass ratio of the Euka 730U dispersant to the Euka 680U dispersant is preferably 2:3.

[0065] In addition, the alicyclic amine preferably includes o-diaminomethylcyclopentane (TDC-850) and isophoronediamine (IPDA), and the mass ratio of o-diaminomethylcyclopentane (TDC-850) and isophoronediamine (IPDA) is preferably 3:1; the epoxy accelerator is preferably 2,4,6-tris(dimethylaminomethyl)phenol (DMP-30 or K54); and the polyetheramine is Huntsman D2000.

[0066] In the present invention, a method for preparing a flexible weather-resistant epoxy coating containing diisocyanate preferably comprises the following steps:

[0067] (1) first mixing a polyurethane modified epoxy resin, a reactive diluent, a silane coupling agent, carbon black, titanium dioxide, a weather-resistant filler, a defoaming agent and a dispersant to obtain a component A;

[0068] (2) performing a second mixing of the alicyclic amine, the epoxy accelerator and the polyether amine to obtain a component B;

[0069] (3) After obtaining component A and component B, the present invention places component A and component B independently. When they are needed, component A and component B are stirred and mixed at a mass ratio of 100:12, and then applied.

[0070] Performance Test:

[0071] Preparation of flexible weather-resistant epoxy coating: Component A and component B are mixed at a mass ratio of 100:12, stirred at 1400 rpm for 4 minutes at room temperature to obtain a flexible weather-resistant epoxy coating, and the following tests are performed:

[0072] 1. Tensile properties of room temperature air curing: dumbbell I-type specimens were prepared according to the provisions of GB / T 528-2009, and the specimens were cured in an environment with room temperature (23±2)℃ and humidity (50±10)%. After 7 days, the tensile properties were tested to be 11MPa and the elongation at break was 75%; after 28 days, the tensile properties were tested, the tensile strength was 23MPa, and the elongation at break was 40%;

[0073] 2. Bonding strength: Test the bonding strength according to the method specified in 7.9 of JC / T 2217-2014. The samples were prepared in the following ways: ① The dry base surface was not coated with Gumid epoxy interface agent, but directly coated with flexible weather-resistant epoxy coating, and the following three methods were adopted for curing: a. Soak in room temperature water for 28 days after 7 days of air curing at room temperature; b. Soak in room temperature water for 28 days after 21 days of air curing at room temperature; c. Soak in room temperature water for 7 days after 21 days of air curing at room temperature; c. Soak in room temperature air curing at room temperature for 7 days. ② The dry base surface was coated with Gumid epoxy interface agent, and flexible weather-resistant epoxy coating was applied after the interface agent was dry, and the same three methods were adopted for curing. During the above process, the coating on the sample block did not peel, crack or peel off. The bonding strength was tested by pulling, and the data are shown in Table 2.

[0074] Table 2 Adhesion strength test results

[0075]

[0076] It can be seen from Table 2 that no matter what kind of brushing and curing method is adopted, the obtained flexible weather-resistant epoxy coating has good bonding strength, which is greater than the 2.5MPa specified by the national standard.

[0077] 3. Weather resistance: The samples above were made under the same conditions and air-cured at room temperature for 7 days, including those coated with Gumid epoxy interface agent and those directly coated with flexible weather-resistant epoxy coating. After 720 hours of artificial weather aging, there was no powdering and yellowing, indicating good weather resistance.

[0078] 4. According to the tests on the coating's anti-seepage pressure, frost resistance, chemical resistance (acid resistance, alkali resistance, salt resistance) and impact resistance in JC / T 2217-2014, the coating has no cracking, peeling or flaking.

[0079] Embodiment 3:

[0080] A flexible weather-resistant epoxy coating containing diisocyanate, comprising independently packaged component A and component B; the mass ratio of component A to component B is 100:12;

[0081] The A component includes the following components in percentage by weight:

[0082] Polyurethane modified epoxy resin 75%, active diluent 12%, silane coupling agent 2%, carbon black 0.1%, titanium dioxide 4%, weather-resistant filler 6%, defoamer 0.5%, dispersant 0.4%;

[0083] The B component includes the following components in percentage by mass:

[0084] Alicyclic amine 75%, epoxy accelerator 2%, polyether amine 23%;

[0085] The polyurethane modified epoxy resin is obtained by copolymerizing a polyurethane prepolymer, a bisphenol A resin and a bisphenol F resin, wherein the mass ratio of the polyurethane prepolymer to the bisphenol A resin and the bisphenol F resin is 5:1:1; and the polyurethane prepolymer is obtained by copolymerizing a diisocyanate, polypropylene glycol PPG400 and polypropylene glycol PPG1000.

[0086] The mass ratio of the diisocyanate to 4,4'-diisocyanate dicyclohexylmethane and dicyclohexylmethane diisocyanate is 5:1; the mass ratio of the diisocyanate to polypropylene glycol PPG400 and polypropylene glycol PPG1000 is 1:5:4; the bisphenol A resin is preferably Nan Ya NPEL-128 bisphenol A resin; the bisphenol F resin is NPEL-170 bisphenol F resin produced by Kunshan Nan Ya; the active diluent is 1,6-hexanediol diacrylate; the silicone The alkane coupling agent is vinyl triethoxysilane; the weather-resistant filler is quartz; the defoamer includes a silicone defoamer and a non-silicon defoamer, the silicone defoamer is preferably Euka P-570 defoamer, the non-silicon defoamer is preferably Euka 590 defoamer, and the mass ratio of the silicone defoamer and the non-silicon defoamer is 2:1; the dispersant preferably includes Euka 680U dispersant and Euka 730U dispersant, and the mass ratio of the Euka 730U dispersant to the Euka 680U dispersant is preferably 2:3.

[0087] In addition, the alicyclic amine preferably includes o-diaminomethylcyclopentane (TDC-850) and isophoronediamine (IPDA), and the mass ratio of o-diaminomethylcyclopentane (TDC-850) and isophoronediamine (IPDA) is preferably 3:1; the epoxy accelerator is preferably 2,4,6-tris(dimethylaminomethyl)phenol (DMP-30 or K54); and the polyetheramine is Huntsman D2000.

[0088] In the present invention, a method for preparing a flexible weather-resistant epoxy coating containing diisocyanate preferably comprises the following steps:

[0089] (1) first mixing a polyurethane modified epoxy resin, a reactive diluent, a silane coupling agent, carbon black, titanium dioxide, a weather-resistant filler, a defoaming agent and a dispersant to obtain a component A;

[0090] (2) performing a second mixing of the alicyclic amine, the epoxy accelerator and the polyether amine to obtain a component B;

[0091] (3) After obtaining component A and component B, the present invention places component A and component B independently. When they are needed, component A and component B are stirred and mixed at a mass ratio of 100:12, and then applied.

[0092] Performance Test:

[0093] Preparation of flexible weather-resistant epoxy coating: Component A and component B are mixed at a mass ratio of 100:12, stirred at 1400 rpm for 4 minutes at room temperature to obtain a flexible weather-resistant epoxy coating, and the following tests are performed:

[0094] 1. Tensile properties of room temperature air curing: dumbbell I-type specimens were prepared according to the provisions of GB / T 528-2009, and the specimens were cured in an environment with room temperature (23±2)℃ and humidity (50±10)%. After 7 days, the tensile properties were tested to be 11MPa and the elongation at break was 73%; after 28 days, the tensile properties were tested, the tensile strength was 22MPa, and the elongation at break was 42%;

[0095] 2. Bonding strength: Test the bonding strength according to the method specified in 7.9 of JC / T 2217-2014. The samples were prepared in the following ways: ① The dry base surface was not coated with Gumid epoxy interface agent, but directly coated with flexible weather-resistant epoxy coating, and the following three methods were adopted for curing: a. Soak in room temperature water for 28 days after 7 days of air curing at room temperature; b. Soak in room temperature water for 28 days after 21 days of air curing at room temperature; c. Soak in room temperature water for 7 days. ② The dry base surface was coated with Gumid epoxy interface agent, and flexible weather-resistant epoxy coating was applied after the interface agent was dry, and the same three methods were adopted for curing. During the whole process, there was no peeling, cracking or flaking of the coating on the sample. The bonding strength was tested by pulling, and the data are shown in Table 3.

[0096] Table 3 Adhesion strength test results

[0097]

[0098] It can be seen from Table 3 that no matter what kind of brushing and curing method is adopted, the obtained flexible weather-resistant epoxy coating has good bonding strength, which is greater than the 2.5MPa specified by the national standard.

[0099] 3. Weather resistance: The samples above were made under the same conditions and air-cured at room temperature for 7 days, including those coated with Gumid epoxy interface agent and those directly coated with flexible weather-resistant epoxy coating. After 720 hours of artificial weather aging, there was no powdering and yellowing, indicating good weather resistance.

[0100] 4. According to the tests on the coating's anti-seepage pressure, frost resistance, chemical resistance (acid resistance, alkali resistance, salt resistance) and impact resistance in JC / T 2217-2014, the coating has no cracking, peeling or flaking.

[0101] Embodiment 4:

[0102] A flexible weather-resistant epoxy coating containing diisocyanate, comprising independently packaged component A and component B; the mass ratio of component A to component B is 100:12;

[0103] The A component includes the following components in percentage by weight:

[0104] Polyurethane modified epoxy resin 75%, active diluent 12%, silane coupling agent 2%, carbon black 0.1%, titanium dioxide 4%, weather-resistant filler 6%, defoamer 0.5%, dispersant 0.4%;

[0105] The B component includes the following components in percentage by mass:

[0106] Alicyclic amine 75%, epoxy accelerator 2%, polyether amine 23%;

[0107] The polyurethane modified epoxy resin is obtained by copolymerizing a polyurethane prepolymer, a bisphenol A resin and a bisphenol F resin, wherein the mass ratio of the polyurethane prepolymer to the bisphenol A resin and the bisphenol F resin is 5:1:1; and the polyurethane prepolymer is obtained by copolymerizing a diisocyanate, polypropylene glycol PPG400 and polypropylene glycol PPG1000.

[0108] wherein the diisocyanate is dicyclohexylmethane diisocyanate; the mass ratio of diisocyanate to polypropylene glycol PPG400 and polypropylene glycol PPG1000 is 1:5:4; the bisphenol A resin is preferably Nan Ya NPEL-128 bisphenol A resin; the bisphenol F resin is NPEL-170 bisphenol F resin produced by Kunshan Nan Ya; the active diluent is 1,6-hexanediol diacrylate; the silane coupling agent is vinyl triethoxysilane; the weather-resistant filler is quartz; the defoamer includes an organosilicon defoamer and a non-silicon defoamer, the organosilicon defoamer is preferably Euka P-570 defoamer, the non-silicon defoamer is preferably Euka 590 defoamer, and the mass ratio of the organosilicon defoamer and the non-silicon defoamer is 2:1; the dispersant preferably includes Euka 680U dispersant and Euka 730U dispersant, and the mass ratio of the Euka 730U dispersant to the Euka 680U dispersant is preferably 2:3.

[0109] In addition, the alicyclic amine preferably includes o-diaminomethylcyclopentane (TDC-850) and isophoronediamine (IPDA), and the mass ratio of o-diaminomethylcyclopentane (TDC-850) and isophoronediamine (IPDA) is preferably 3:1; the epoxy accelerator is preferably 2,4,6-tris(dimethylaminomethyl)phenol (DMP-30 or K54); and the polyetheramine is Huntsman D2000.

[0110] In the present invention, a method for preparing a flexible weather-resistant epoxy coating containing diisocyanate preferably comprises the following steps:

[0111] (1) first mixing a polyurethane modified epoxy resin, a reactive diluent, a silane coupling agent, carbon black, titanium dioxide, a weather-resistant filler, a defoaming agent and a dispersant to obtain a component A;

[0112] (2) performing a second mixing of the alicyclic amine, the epoxy accelerator and the polyether amine to obtain a component B;

[0113] (3) After obtaining component A and component B, the present invention places component A and component B independently. When they are needed, component A and component B are stirred and mixed at a mass ratio of 100:12, and then applied.

[0114] Performance Test:

[0115] Preparation of flexible weather-resistant epoxy coating: Component A and component B are mixed at a mass ratio of 100:12, stirred at 1400 rpm for 4 minutes at room temperature to obtain a flexible weather-resistant epoxy coating, and the following tests are performed:

[0116] 1. Tensile properties of room temperature air curing: dumbbell I-type specimens were prepared according to the provisions of GB / T 528-2009, and the specimens were cured in an environment with room temperature (23±2)℃ and humidity (50±10)%. After 7 days, the tensile properties were tested to be 12MPa and the elongation at break was 71%; after 28 days, the tensile properties were tested, the tensile strength was 23MPa, and the elongation at break was 43%;

[0117] 2. Bonding strength: Test the bonding strength according to the method specified in 7.9 of JC / T 2217-2014. The samples were prepared in the following ways: ① The dry base surface was not coated with Gumid epoxy interface agent, but directly coated with flexible weather-resistant epoxy coating, and the following three methods were adopted for curing: a. Soak in room temperature water for 28 days after 7 days of air curing at room temperature; b. Soak in room temperature water for 28 days after 21 days of air curing at room temperature; c. Soak in room temperature water for 7 days after air curing at room temperature. ② The dry base surface was coated with Gumid epoxy interface agent, and flexible weather-resistant epoxy coating was applied after the interface agent was dry, and the same three methods were adopted for curing. During the above process, the coating on the sample block did not peel, crack or peel off. The bonding strength was tested by pulling, and the data are shown in Table 4.

[0118] Table 4 Adhesion strength test results

[0119]

[0120] It can be seen from Table 4 that no matter what kind of brushing and curing method is adopted, the obtained flexible weather-resistant epoxy coating has good bonding strength, which is greater than the 2.5MPa specified by the national standard.

[0121] 3. Weather resistance: The samples above were made under the same conditions and air-cured at room temperature for 7 days, including those coated with Gumid epoxy interface agent and those directly coated with flexible weather-resistant epoxy coating. After 720 hours of artificial weather aging, there was no powdering and yellowing, indicating good weather resistance.

[0122] 4. According to the tests on the coating's anti-seepage pressure, frost resistance, chemical resistance (acid resistance, alkali resistance, salt resistance) and impact resistance in JC / T 2217-2014, the coating has no cracking, peeling or flaking.

[0123] Embodiment 5:

[0124] A flexible weather-resistant epoxy coating containing diisocyanate, comprising independently packaged component A and component B; the mass ratio of component A to component B is 100:20;

[0125] The A component includes the following components in percentage by weight:

[0126] Polyurethane modified epoxy resin 75%, active diluent 12%, silane coupling agent 2%, carbon black 0.1%, titanium dioxide 4%, weather-resistant filler 6%, defoamer 0.5%, dispersant 0.4%;

[0127] The B component includes the following components in percentage by mass:

[0128] Alicyclic amine 75%, epoxy accelerator 2%, polyether amine 23%;

[0129] The polyurethane modified epoxy resin is obtained by copolymerizing a polyurethane prepolymer, a bisphenol A resin and a bisphenol F resin, wherein the mass ratio of the polyurethane prepolymer to the bisphenol A resin and the bisphenol F resin is 5:1:3; and the polyurethane prepolymer is obtained by copolymerizing a diisocyanate, polypropylene glycol PPG400 and polypropylene glycol PPG1000.

[0130] The mass ratio of the diisocyanate to dicyclohexylmethane diisocyanate and hexamethylene diisocyanate is 1:1; the mass ratio of the diisocyanate to polypropylene glycol PPG400 and polypropylene glycol PPG1000 is 1:2:2; the bisphenol A resin is preferably Nan Ya NPEL-128 bisphenol A resin; the bisphenol F resin is NPEL-170 bisphenol F resin produced by Kunshan Nan Ya; the active diluent is 1,6-hexanediol diacrylate; the silane coupling agent is preferably 1,6-hexanediol diacrylate; the silane coupling agent is preferably 1,6-hexanediol diacrylate; the bisphenol A resin ... The agent is vinyl triethoxysilane; the weather-resistant filler is quartz; the defoaming agent includes a silicone defoaming agent and a non-silicon defoaming agent, the silicone defoaming agent is preferably Euka P-570 defoaming agent, and the non-silicon defoaming agent is preferably Euka 590 defoaming agent, and the mass ratio of the silicone defoaming agent and the non-silicon defoaming agent is 1:1; the dispersant preferably includes Euka 680U dispersant and Euka 730U dispersant, and the mass ratio of the Euka 730U dispersant to the Euka 680U dispersant is preferably 5:3.

[0131] In addition, the alicyclic amine preferably includes o-diaminomethylcyclopentane (TDC-850) and isophoronediamine (IPDA), and the mass ratio of o-diaminomethylcyclopentane (TDC-850) and isophoronediamine (IPDA) is preferably 1:1; the epoxy accelerator is preferably 2,4,6-tris(dimethylaminomethyl)phenol (DMP-30 or K54); and the polyetheramine is Huntsman D2000.

[0132] In the present invention, a method for preparing a flexible weather-resistant epoxy coating containing diisocyanate preferably comprises the following steps:

[0133] (1) first mixing a polyurethane modified epoxy resin, a reactive diluent, a silane coupling agent, carbon black, titanium dioxide, a weather-resistant filler, a defoaming agent and a dispersant to obtain a component A;

[0134] (2) performing a second mixing of the alicyclic amine, the epoxy accelerator and the polyether amine to obtain a component B;

[0135] (3) After obtaining component A and component B, the present invention places component A and component B independently. When they are needed, component A and component B are stirred and mixed at a mass ratio of 100:20, and then applied.

[0136] Performance Test:

[0137] Preparation of flexible weather-resistant epoxy coating: Component A and component B are mixed at a mass ratio of 100:20, stirred at a speed of 1400 rpm for 4 minutes at room temperature to obtain a flexible weather-resistant epoxy coating, and the following tests are performed:

[0138] 1. Tensile properties of room temperature air curing: dumbbell I-type specimens were prepared according to the provisions of GB / T 528-2009, and the specimens were cured in an environment with room temperature (23±2)℃ and humidity (50±10)%. After 7 days, the tensile properties were tested to be 4.5MPa and the elongation at break was 21%; after 28 days, the tensile properties were tested, the tensile strength was 7.7MPa, and the elongation at break was 27%;

[0139] 2. Bond strength: Test the bond strength according to the method specified in 7.9 of JC / T 2217-2014. The samples were prepared in the following ways: ① The dry base surface was not coated with Gumid epoxy interface agent, but directly coated with flexible weather-resistant epoxy coating, and the following three methods were adopted for curing: a. Soak in room temperature water for 28 days after 7 days of room temperature air curing; b. Soak in room temperature water for 28 days after 21 days of room temperature air curing; c. Soak in room temperature air curing for 7 days. ② The dry base surface was coated with Gumid epoxy interface agent, and flexible weather-resistant epoxy coating was applied after the interface agent was dry, and the same three methods were adopted for curing. During the above process, the coating on the sample block was peeling, cracking and flaking.

[0140] 3. Weather resistance: The samples above were made under the same conditions and air-cured at room temperature for 7 days, including those coated with Gumid epoxy interface agent and those directly coated with flexible weather-resistant epoxy coating. After 720 hours of artificial weather aging, both showed powdering and yellowing, indicating poor weather resistance.

[0141] 4. According to the tests on the coating's anti-seepage pressure, frost resistance, chemical resistance (acid resistance, alkali resistance, salt resistance) and impact resistance in JC / T 2217-2014, the coating showed cracking, peeling and flaking.

[0142] The above is a description of a specific embodiment of the present invention. It should be understood that the present invention is not limited to the above embodiment, and the above embodiment and description are only for illustrating the principle of the present invention.

[0143] Those skilled in the art may make various non-substantial changes and improvements to the present invention without departing from the concept of the present invention, all of which fall within the scope of protection claimed by the present invention.

Claims

1. A flexible weather-resistant epoxy coating containing diisocyanate, comprising independently packaged component A and component B; The A component includes the following components in percentage by weight: Polyurethane modified epoxy resin 60-80%, active diluent 7-15%, silane coupling agent 1-5%, carbon black 0.10-0.15%, titanium dioxide 4-4.5%, weather-resistant filler 5-8%, defoamer 0.5-0.8%, dispersant 0.3-0.5%; the B component includes the following components in percentage by mass: Alicyclic amine 70-80%, epoxy accelerator 1-3%, polyether amine 15-30%.

2. The coating according to claim 1, characterized in that The mass ratio of the component A to the component B is 100:(10-15).

3. The coating according to claim 2, characterized in that The polyurethane modified epoxy resin is obtained by copolymerizing a polyurethane prepolymer, bisphenol A resin and bisphenol F resin; and the polyurethane prepolymer is obtained by copolymerizing a diisocyanate, polypropylene glycol PPG400 and polypropylene glycol PPG1000.

4. The coating according to claim 1, characterized in that The diisocyanate is selected from one or more of 4,4'-diisocyanate dicyclohexylmethane, dicyclohexylmethane diisocyanate, 1,4-cyclohexane diisocyanate, isophorone diisocyanate, and hexamethylene diisocyanate.

5. The coating according to claim 1, characterized in that The bisphenol A resin preferably includes Nan Ya NPEL-128 bisphenol A resin; the bisphenol F resin is preferably NPEL-170 bisphenol F resin produced by Kunshan Nan Ya.

6. The coating according to claim 1, characterized in that The active diluent is 1,6-hexanediol diacrylate; the silane coupling agent is vinyl triethoxysilane; and the weather-resistant filler is quartz.

7. The coating according to claim 1, characterized in that The defoamer comprises an organosilicon defoamer and a non-silicon defoamer; the organosilicon defoamer is preferably Euka P-570 defoamer; the non-silicon defoamer is preferably Euka 590 defoamer; the mass ratio of the organosilicon defoamer and the non-silicon defoamer is 2:

1.

8. The coating according to claim 1, characterized in that The dispersant preferably includes Euka 680U dispersant and Euka 730U dispersant, and the mass ratio of the Euka 730U dispersant to the Euka 680U dispersant is preferably 2:

3.

9. The coating according to claim 1, characterized in that The alicyclic amine preferably includes o-diaminomethylcyclopentane (TDC-850) and isophoronediamine (IPDA), and the mass ratio of o-diaminomethylcyclopentane (TDC-850) and isophoronediamine (IPDA) is preferably 3:1; the epoxy accelerator is preferably 2,4,6-tris(dimethylaminomethyl)phenol (DMP-30 or K54); and the polyetheramine is Huntsman D2000.

10. A method for preparing a flexible weather-resistant epoxy coating containing diisocyanate, characterized in that: The preparation method preferably comprises the following steps: (1) first mixing a polyurethane modified epoxy resin, a reactive diluent, a silane coupling agent, carbon black, titanium dioxide, a weather-resistant filler, a defoaming agent and a dispersant to obtain a component A; (2) performing a second mixing of the alicyclic amine, the epoxy accelerator and the polyether amine to obtain a component B; (3) After obtaining component A and component B, the present invention places component A and component B independently. When they are needed, component A and component B are stirred and mixed according to a mass ratio and then applied.

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