Self-dispersing nano-diamond reinforced coating as well as preparation method and application thereof

Abstract

The invention discloses a self-dispersing nano-diamond reinforced coating as well as a preparation method and application thereof, and belongs to the technical field of protective coatings. The self-dispersing nano-diamond reinforced coating provided by the invention comprises a component A and a component B. The component A comprises the following components in parts by mass: 15-35 parts of epoxy resin, 1-30 parts of nano-diamond, 5-15 parts of a solvent and 0.5-1 part of a defoaming agent; and the component B comprises the following component in parts by mass: 2-15 parts of a curing agent. The coating is simple in ingredient, has good effects in adhesive force, impact strength, flexibility, neutral salt spray test and alkaline soaking, is a multifunctional transparent coating with corrosion resistance, wear resistance and antifouling performance at the same time, and has wide application scenes and practical value.

Description

Technical Field

[0001] The invention belongs to the technical field of protective coatings, and in particular relates to a self-dispersed nano-diamond reinforced coating and a preparation method and application thereof. Background Art

[0002] Metal materials are the most widely used structural materials in human society. With the continuous advancement of science and technology, the application environment of metal materials is becoming more and more complex, and the material protection problem that has always plagued mankind has become more complex and severe.

[0003] Material damage mainly includes physical damage such as collision and friction; corrosion damage such as acid and alkali chemical corrosion, electrochemical corrosion, etc.; and damage caused by the attachment of marine microorganisms. The most applicable, effective and lowest-cost method for protecting material damage is to use appropriate coatings. Usually, specific functional coatings are required to address different protection issues, such as mechanical protective coatings with high wear resistance and high toughness, anti-corrosion coatings for specific corrosive media, and anti-fouling coatings that prevent microbial attachment. Multiple coatings need to be applied layer by layer, and the adhesion between the coatings and between the coatings as a whole and the base must be guaranteed. This makes the thickness of the substrate protection coating in some environments reach thousands of microns. In addition, due to the functional requirements of the coating, there are many types of fillers, and the combination of the components of the various filler bonds is complicated. Dispersants, leveling agents, diluents and other raw materials are also required for mixing. Summary of the Invention

[0004] In view of the above-mentioned prior art, the present invention provides a self-dispersing nano-diamond reinforced coating and its preparation method and application, which solves the problems of complex ingredients and single function of the prior art coating.

[0005] In order to achieve the above-mentioned object, the technical solution adopted by the present invention is: providing a self-dispersing nano-diamond reinforced coating, including component A and component B, component A includes the following components in parts by weight: 15-35 parts of epoxy resin, 1-30 parts of nano-diamond, 5-15 parts of solvent, and 0.5-1 part of defoaming agent; component B includes the following components in parts by weight: 2-15 parts of curing agent.

[0006] The beneficial effects of the present invention are as follows: the self-dispersing nanodiamond-enhanced coating provided by the present invention utilizes the self-dispersibility, chemical stability, mechanical properties, optical properties and specific functional groups of nanodiamonds to achieve a self-dispersing effect in the main coating material, enhance the wear resistance of the coating, and achieve corrosion inhibition by adsorbing free oxygen in the corrosive medium. At the same time, the coating has good hydrophobicity and self-cleaning properties, which can achieve an anti-fouling function; the coating has simple ingredients and has achieved good results in adhesion, impact strength, flexibility, neutral salt spray test and alkaline immersion, indicating that it has an extremely long service life and can significantly reduce the frequency of maintenance and recoating, thereby reducing long-term use costs. In addition, the multifunctional integrated design avoids the complex process of multi-layer coating, further saving construction time and material costs, and has excellent industrial application prospects.

[0007] On the basis of the above technical solution, the present invention can also be improved as follows.

[0008] Furthermore, the mass ratio of component A to component B is 7 to 9:1.

[0009] Furthermore, the epoxy resin is bisphenol A epoxy resin or polyoxyethylene epoxy resin.

[0010] Furthermore, the nanodiamond has a spherical or flake-like shape and a particle size of 10 to 1000 nm.

[0011] The beneficial effects of adopting further technical solutions are: the morphology and particle size range of nanodiamonds can be flexibly adjusted according to actual needs, allowing the coating to adapt to different complex working conditions. The self-dispersing properties of nanodiamonds reduce dependence on additional dispersants, further reducing the content of harmful chemicals in the coating.

[0012] Furthermore, the solvent is xylene, n-butanol or water.

[0013] Furthermore, the defoaming agent is vinyl silicone oil, polyether ester or paraffin.

[0014] Furthermore, the curing agent is a phenalkamine epoxy curing agent or phthalic anhydride.

[0015] The present invention also provides a method for preparing a self-dispersed nano-diamond reinforced coating, comprising the following steps:

[0016] S1: Mix epoxy resin and solvent and stir evenly, then add nanodiamond and defoamer and continue stirring, and then disperse until the fineness is less than 80μm to obtain component A;

[0017] S2: Add the curing agent to component A and mix and stir evenly to obtain a self-dispersed nano-diamond reinforced coating.

[0018] The beneficial effects of the present invention are as follows: the preparation method provided by the present invention has a simple process flow, does not require complicated operations, can be prepared and used on site, reduces manpower and equipment costs, and has high industrial value.

[0019] The present invention also provides the application of self-dispersed nano-diamond reinforced coating in metal protection.

[0020] Furthermore, the application is to spray or brush the self-dispersed nano-diamond reinforced coating on a metal surface so that the coating dry film thickness is 60 to 400 μm.

[0021] The beneficial effects of the present invention are as follows: the self-dispersing nano-diamond reinforced coating provided by the present invention has good results in multiple experiments such as adhesion, impact strength, flexibility, neutral salt spray test and alkaline immersion, indicating that the coating has multifunctionality. The multifunctional coating does not need to be used in combination with other coatings in metal protection. One coating can solve multiple problems, reducing the use cost and saving time. DETAILED DESCRIPTION

[0022] The specific implementation methods of the present invention are described in detail below with reference to the embodiments.

[0023] Example 1

[0024] A self-dispersing nano-diamond reinforced coating comprises a component A and a component B. Component A comprises the following components in parts by mass: 30 parts of bisphenol A epoxy resin, 20 parts of spherical nano-diamonds with a particle size of 400 nm, 10 parts of xylene, and 0.7 parts of vinyl silicone oil; and component B comprises the following components in parts by mass: 8.6 parts of a phenalkamine epoxy curing agent.

[0025] The self-dispersed nano-diamond reinforced coating of this embodiment is prepared by the following steps:

[0026] S1: Mix bisphenol A epoxy resin and xylene and stir evenly, then add spherical nanodiamonds with a particle size of 400 nm and vinyl silicone oil and continue stirring, and then disperse them until the fineness is less than 80 μm to obtain component A;

[0027] S2: Add the phenolic amine epoxy curing agent to component A and mix and stir evenly to obtain a self-dispersed nano-diamond reinforced coating.

[0028] Example 2

[0029] A self-dispersing nano-diamond reinforced coating comprises a component A and a component B. Component A comprises the following components in parts by mass: 30 parts of bisphenol A epoxy resin, 2 parts of flaky nano-diamonds with a particle size of 1000 nm, 10 parts of n-butanol, and 0.7 parts of vinyl silicone oil; and component B comprises the following components in parts by mass: 6.1 parts of a phenalkamine epoxy curing agent.

[0030] The self-dispersed nano-diamond reinforced coating of this embodiment is prepared by the following steps:

[0031] S1: Mix bisphenol A epoxy resin and n-butanol and stir evenly, then add flaky nanodiamonds with a particle size of 1000 nm and vinyl silicone oil and continue stirring, and then disperse them to a fineness of less than 80 μm to obtain component A;

[0032] S2: Add the phenolic amine epoxy curing agent to component A and mix and stir evenly to obtain a self-dispersed nano-diamond reinforced coating.

[0033] Example 3

[0034] A self-dispersing nano-diamond reinforced coating comprises a component A and a component B. Component A comprises the following components in parts by mass: 35 parts of polyoxyethylene epoxy resin, 20 parts of spherical nano-diamonds with a particle size of 10 nm, 10 parts of water, and 0.7 parts of polyether ester; and component B comprises the following components in parts by mass: 7.3 parts of phthalic anhydride.

[0035] The self-dispersed nano-diamond reinforced coating of this embodiment is prepared by the following steps:

[0036] S1: Mix polyoxyethylene epoxy resin and water and stir evenly, then add spherical nanodiamonds with a particle size of 10 nm and polyether ester and continue stirring, and then disperse them until the fineness is less than 80 μm to obtain component A;

[0037] S2: adding phthalic anhydride to component A and mixing and stirring uniformly to obtain a self-dispersed nano-diamond reinforced coating.

[0038] Example 4

[0039] A self-dispersed nano-diamond reinforced coating comprises a component A and a component B. Component A comprises the following components in parts by mass: 35 parts of polyoxyethylene epoxy resin, 1 part of flaky nano-diamonds with a particle size of 1000 nm, 10 parts of water, and 0.7 part of paraffin wax; and component B comprises the following components in parts by mass: 7.3 parts of phthalic anhydride.

[0040] The self-dispersed nano-diamond reinforced coating of this embodiment is prepared by the following steps:

[0041] S1: Mix polyoxyethylene epoxy resin and water and stir evenly, then add flaky nanodiamonds with a particle size of 1000 nm and paraffin wax and continue stirring, and then disperse them until the fineness is less than 80 μm to obtain component A;

[0042] S2: adding phthalic anhydride to component A and mixing and stirring uniformly to obtain a self-dispersed nano-diamond reinforced coating.

[0043] Example 5

[0044] A self-dispersing nano-diamond reinforced coating comprises a component A and a component B. Component A comprises the following components in parts by mass: 25 parts of bisphenol A epoxy resin, 20 parts of spherical nano-diamonds with a particle size of 400 nm, 5 parts of xylene, and 0.5 parts of vinyl silicone oil; and component B comprises the following components in parts by mass: 7.2 parts of a phenalkamine epoxy curing agent.

[0045] The self-dispersed nano-diamond reinforced coating of this embodiment is prepared by the following steps:

[0046] S1: Mix bisphenol A epoxy resin and xylene and stir evenly, then add spherical nanodiamonds with a particle size of 400 nm and vinyl silicone oil and continue stirring, and then disperse them until the fineness is less than 80 μm to obtain component A;

[0047] S2: Add the phenolic amine epoxy curing agent to component A and mix and stir evenly to obtain a self-dispersed nano-diamond reinforced coating.

[0048] Example 6

[0049] A self-dispersing nano-diamond reinforced coating comprises a component A and a component B. Component A comprises the following components in parts by mass: 15 parts of bisphenol A epoxy resin, 30 parts of spherical nano-diamonds with a particle size of 400 nm, 15 parts of n-butanol, and 1 part of vinyl silicone oil; and component B comprises the following components in parts by mass: 7 parts of a phenalkamine epoxy curing agent.

[0050] The self-dispersed nano-diamond reinforced coating of this embodiment is prepared by the following steps:

[0051] S1: Mix bisphenol A epoxy resin and n-butanol and stir evenly, then add spherical nanodiamonds with a particle size of 400 nm and vinyl silicone oil and continue stirring, and then disperse them until the fineness is less than 80 μm to obtain component A;

[0052] S2: Add the phenolic amine epoxy curing agent to component A and mix and stir evenly to obtain a self-dispersed nano-diamond reinforced coating.

[0053] Example 7

[0054] A self-dispersing nano-diamond reinforced coating comprises a component A and a component B. Component A comprises the following components in parts by mass: 25 parts of polyoxyethylene epoxy resin, 20 parts of flaky nano-diamonds with a particle size of 500 nm, 10 parts of water, and 0.7 parts of polyether ester; and component B comprises the following components in parts by mass: 6.2 parts of phthalic anhydride.

[0055] The self-dispersed nano-diamond reinforced coating of this embodiment is prepared by the following steps:

[0056] S1: Mix polyoxyethylene epoxy resin and water and stir evenly, then add flaky nanodiamonds with a particle size of 500 nm and polyether ester and continue stirring, and then disperse them until the fineness is less than 80 μm to obtain component A;

[0057] S2: adding phthalic anhydride to component A and mixing and stirring uniformly to obtain a self-dispersed nano-diamond reinforced coating.

[0058] Example 8

[0059] A self-dispersed nano-diamond reinforced coating comprises a component A and a component B. Component A comprises the following components in parts by mass: 15 parts of polyoxyethylene epoxy resin, 20 parts of flaky nano-diamonds with a particle size of 500 nm, 10 parts of water, and 0.5 parts of paraffin wax; and component B comprises the following components in parts by mass: 5.1 parts of phthalic anhydride.

[0060] The self-dispersed nano-diamond reinforced coating of this embodiment is prepared by the following steps:

[0061] S1: Mix polyoxyethylene epoxy resin and water and stir evenly, then add flaky nanodiamonds with a particle size of 500 nm and paraffin wax and continue stirring, and then disperse them until the fineness is less than 80 μm to obtain component A;

[0062] S2: adding phthalic anhydride to component A and mixing and stirring uniformly to obtain a self-dispersed nano-diamond reinforced coating.

[0063] Comparative Example 1

[0064] A self-dispersing reinforced coating comprises a component A and a component B, wherein the component A comprises the following components in parts by mass: 30 parts of bisphenol A epoxy resin, 10 parts of n-butanol, and 0.7 parts of vinyl silicone oil; and the component B comprises the following components in parts by mass: 6.1 parts of a phenalkamine epoxy curing agent.

[0065] The self-dispersing reinforced coating of this embodiment is prepared by the following steps:

[0066] S1: Mix bisphenol A epoxy resin and n-butanol and stir evenly, then add vinyl silicone oil and continue stirring, and then disperse until the fineness is less than 80 μm to obtain component A;

[0067] S2: Add the phenolic amine epoxy curing agent to component A and mix and stir evenly to obtain a self-dispersion enhanced coating.

[0068] Comparative Example 2

[0069] A self-dispersing reinforced coating comprises a component A and a component B, wherein the component A comprises the following components in parts by mass: 35 parts of polyoxyethylene epoxy resin, 10 parts of water, and 0.7 parts of paraffin wax; and the component B comprises the following components in parts by mass: 7.3 parts of phthalic anhydride.

[0070] The self-dispersing reinforced coating of this embodiment is prepared by the following steps:

[0071] S1: Mix polyoxyethylene epoxy resin and water and stir evenly, then add paraffin wax and continue stirring, and then disperse until the fineness is less than 80 μm to obtain component A;

[0072] S2: Add phthalic anhydride to component A and mix well to obtain a self-dispersion enhanced coating.

[0073] Comparative Example 3

[0074] A self-dispersing reinforced coating comprises a component A and a component B, wherein the component A comprises the following components in parts by mass: 30 parts of bisphenol A epoxy resin, 2 parts of graphene, 10 parts of n-butanol, and 0.7 parts of vinyl silicone oil; and the component B comprises the following components in parts by mass: 6.1 parts of a phenalkamine epoxy curing agent.

[0075] The self-dispersing reinforced coating of this embodiment is prepared by the following steps:

[0076] S1: Mix bisphenol A epoxy resin and n-butanol and stir evenly, then add graphene and vinyl silicone oil and continue stirring, and then disperse until the fineness is less than 80 μm to obtain component A;

[0077] S2: Add the phenolic amine epoxy curing agent to component A and mix and stir evenly to obtain a self-dispersion enhanced coating.

[0078] Experimental example

[0079] Performance test: The coating properties of Examples 1 to 8 and Comparative Examples 1 to 3 were tested in accordance with GB / T 5210-2006, GB / T 1731-2020, GB / T 20624-2006, and GB / T1771-2007, mainly including adhesion, impact strength, flexibility, hardness, antifouling test, neutral salt spray test, and alkaline immersion.

[0080] The adhesion test method is to spray the coating on the metal substrate (the coating dry film thickness is 200μm), and then apply a pulling force at a constant speed until the coating peels off from the substrate.

[0081] The impact strength test method is to spray the coating on a 1kg steel ball (the coating dry film thickness is 400μm), and then let the steel ball fall freely from a height, using the recoil method to observe changes such as cracking and peeling on the coating dry film surface.

[0082] The flexibility test utilizes mandrels of varying diameters, with curvature radii of 1.0mm, 2.5mm, 5.0mm, and 7.5mm. A painted tinplate (coating dry film thickness 60μm) is placed on the mandrels of varying diameters and bent to test the coating's flexibility. The smallest mandrel diameter is the one that allows the coating to be bent without cracking. The minimum diameter, expressed in millimeters, is the assessed flexibility value.

[0083] The hardness test is to use a Mohs hardness tester to test the hardness of the dried paint film.

[0084] The anti-fouling test method is to place the painted tinplate (coating dry film thickness is 60μm) outdoors for 7 days and observe the dirt adhesion of the iron plate.

[0085] The neutral salt spray test and alkaline immersion test method is to place the painted tinplate (coating dry film thickness is 60μm) in neutral salt spray and alkaline solution to observe how long it takes to corrode.

[0086] The experimental results are shown in Table 1. The performance of the coatings prepared in Examples 1 to 8 is higher than that of the coatings prepared in Comparative Examples 1 to 3, indicating that the self-dispersing nanodiamond reinforced coating provided by the present invention has achieved multifunctional uses and effectively solved the problem of the single function of current protective coatings for metal materials.

[0087] Table 1 Performance test results

[0088]

[0089] Although the specific embodiments of the present invention have been described in detail in conjunction with the embodiments, this should not be construed as limiting the scope of protection of this patent. Within the scope described by the claims, various modifications and variations that can be made by those skilled in the art without creative work still fall within the scope of protection of this patent.

Claims

1. A self-dispersed nano-diamond reinforced coating, characterized in that: The invention comprises component A and component B. Component A comprises the following components in parts by mass: 15-35 parts of epoxy resin, 1-30 parts of nanodiamond, 5-15 parts of solvent and 0.5-1 part of defoamer; and component B comprises the following components in parts by mass: 2-15 parts of curing agent.

2. The self-dispersing nano-diamond reinforced coating according to claim 1, characterized in that: The mass ratio of component A to component B is 7 to 9:

1.

3. The self-dispersed nano-diamond reinforced coating according to claim 1, characterized in that: The epoxy resin is bisphenol A epoxy resin or polyoxyethylene epoxy resin.

4. The self-dispersed nano-diamond reinforced coating according to claim 1, characterized in that: The nano-diamond is in a spherical or flake shape, and has a particle size of 10 to 1000 nm.

5. The self-dispersed nano-diamond reinforced coating according to claim 1, characterized in that: The solvent is xylene, n-butanol or water.

6. The self-dispersed nano-diamond reinforced coating according to claim 1, characterized in that: The defoaming agent is vinyl silicone oil, polyether ester or paraffin.

7. The self-dispersed nano-diamond reinforced coating according to claim 1, characterized in that: The curing agent is a phenalkamine type epoxy curing agent or phthalic anhydride.

8. The method for preparing the self-dispersed nano-diamond reinforced coating according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1: Mix epoxy resin and solvent and stir evenly, then add nanodiamond and defoamer and continue stirring, and then disperse until the fineness is less than 80μm to obtain component A; S2: Add the curing agent to component A and mix and stir evenly to obtain a self-dispersed nano-diamond reinforced coating.

9. Use of the self-dispersed nano-diamond reinforced coating according to any one of claims 1 to 7 in metal protection.

10. The use according to claim 9, characterized in that: The self-dispersed nano-diamond reinforced coating is sprayed or brushed on the metal surface to make the coating dry film thickness be 60 to 400 μm.

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