Basalt scale reinforced anticorrosive paint, preparation method thereof, coating and coated product

Abstract

The invention discloses a basalt flake reinforced anticorrosive coating, which comprises epoxy resin, a curing agent, basalt flakes and carbon nanotubes, the mass ratio of the epoxy resin to the curing agent is (1-4): 1, the mass ratio of the basalt flakes to the epoxy resin is (0.4-1): 1, and the mass ratio of the carbon nanotubes to the basalt flakes is (0.01-0.02): 10. On the basis, the invention further discloses a preparation method of the basalt flake reinforced anticorrosive paint, a coating and a coated product. The composite material is suitable for the marine environment, can meet multiple requirements of ships, offshore platforms and other marine equipment for adapting to the dynamic corrosion environment, long-acting corrosion resistance, wear resistance, impact resistance, electromagnetic shielding, electromagnetic interference resistance and the like, and is excellent in comprehensive performance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of coating, in particular to a basalt flake reinforced anticorrosive coating, a preparation method thereof, a coating layer and a coated product. BACKGROUND

[0002] The ocean environment contains rich resources and development potential, but also has severe corrosion and dynamic mechanical challenges. In the marine environment, seawater itself is a strong corrosive medium, and high salinity, oxygen content, marine organisms and their metabolites in seawater can directly or indirectly accelerate the corrosion process of metal components. At the same time, waves, tides, currents will produce reciprocating stress and impact on metal components. Therefore, submarines, ships, offshore platforms and other marine equipment need to be made of high-strength, corrosion-resistant materials and rely on high-performance anticorrosive coatings for long-term protection.

[0003] At present, the anticorrosive coatings used in the marine environment are mainly formed by epoxy coatings, polyurethane coatings and silicone resin coatings, which have certain limitations in severe marine environments. For example, although the epoxy coating has excellent chemical corrosion resistance and adhesion, its rigid molecular structure is difficult to adapt to the dynamic corrosion environment, and the protection mechanism is mainly passive barrier, which is difficult to deal with progressive damage, and the protection performance gradually decreases after long-term use. The polyurethane coating has good flexibility, but it is prone to hydrolysis in high temperature and high humidity environment, and its water resistance is inferior to that of the epoxy system, and its mechanical strength and wear resistance are insufficient, usually relying on the enhancement of the intermediate coating, increasing the process complexity. Although the silicone resin coating has excellent weather resistance, its mechanical properties are poor, and its mechanical strength is insufficient, which is easy to wear and peel off, and it is difficult to meet the structural protection requirements of marine equipment alone.

[0004] It can be seen that various anticorrosive coatings focus on optimizing single performance, such as only improving corrosion resistance or flexibility, and lack of comprehensive solutions for multiple functions. This single performance-oriented design makes it difficult to meet the comprehensive needs of marine equipment adapting to the marine environment. SUMMARY

[0005] The purpose of the present application is to provide a basalt flake reinforced anticorrosive coating, a preparation method thereof, a coating layer and a coated product to meet the comprehensive needs of marine equipment adapting to dynamic corrosion environment, long-term corrosion resistance, wear resistance and impact resistance.

[0006] In order to achieve the above purpose, the technical scheme adopted by the present application is as follows:

[0007] The basalt flake reinforced anticorrosive coating comprises an epoxy resin, a curing agent, basalt flake and carbon nanotubes, the mass ratio of the epoxy resin to the curing agent is (1-4):1, the mass ratio of the basalt flake to the epoxy resin is (0.4-1):1, and the mass ratio of the carbon nanotubes to the basalt flake is (0.01-0.02):10.

[0008] Further, the curing agent is polyether amine.

[0009] Further, the surface of the basalt flake is coated with graphene.

[0010] The application further provides a preparation method of the basalt flake reinforced anticorrosive coating.

[0011] S1. The epoxy resin, the basalt flake and the carbon nanotubes are mixed and stirred for 4-8 hours according to the proportion to obtain a mixed slurry;

[0012] S2. The curing agent is added into the mixed slurry according to the proportion and stirred for 4-10 hours to obtain the basalt flake reinforced anticorrosive coating.

[0013] Further, the method further comprises the following step before step S1:

[0014] S0. The surface of the basalt flake is coated with graphene.

[0015] The application further provides a basalt flake reinforced anticorrosive coating layer, which is formed by curing the basalt flake reinforced anticorrosive coating.

[0016] Further, the thickness of the coating layer is 20-100 microns, and the curing time of the coating layer at normal temperature is 20-24 hours.

[0017] The application further provides a coated product, which comprises a substrate and a coating layer attached to the surface of the substrate, and the coating layer is the basalt flake reinforced anticorrosive coating layer.

[0018] The application has the following beneficial effects:

[0019] 1. The basalt flake is used as the substrate, the stable mechanical properties of the basalt flake can provide a stable physical skeleton for the coating layer, and the basalt flake has excellent chemical stability and excellent chemical corrosion resistance.

[0020] 2. The flaky basalt flakes are evenly dispersed in the coating, which has a certain stress dispersion effect, and can play a role in strengthening and toughening. It enables the coating to adapt to the dynamic stress generated by the impact of waves, tides and other forces, and blocks the crack propagation path, preventing microcracks from connecting and forming corrosion channels, thus playing a role in progressive damage protection.

[0021] 3. Basalt flakes naturally possess dielectric and magnetic loss capabilities, and the staggered structure formed by the stacked flake structure can extend the propagation path of electromagnetic waves. Combined with carbon nanotubes to enhance conductivity and increase dielectric loss, this can significantly improve the wave absorption of the coating, thereby improving the electromagnetic shielding and electromagnetic interference resistance of the coating.

[0022] 4. The coating has simple components and a streamlined preparation process, which helps to improve production efficiency, achieve rapid mass production, reduce production error rate, and make the coating quality easier to control and maintain consistency between batches. Attached Figure Description

[0023] Figure 1 This is a scanning electron microscope image of basalt flakes from the present invention.

[0024] Figure 2 This is a scanning electron microscope image of the basalt flake-reinforced anti-corrosion coating of the present invention. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0026] Example 1:

[0027] This invention provides a basalt flake-reinforced anti-corrosion coating, comprising epoxy resin, a curing agent, basalt flakes, and carbon nanotubes. The mass ratio of epoxy resin to curing agent is (1-4):1. The mass ratio of basalt flakes to epoxy resin is (0.4-1):1, and the mass ratio of carbon nanotubes to basalt flakes is (0.01-0.02):10.

[0028] Basalt flakes are thin sheet materials made from basalt ore through a unique process of high-temperature melting, diversion, separation, and precipitation. They are chemically extremely stable, have excellent resistance to chemical corrosion, and possess stable mechanical properties.

[0029] The surface morphology of basalt flakes and coatings was analyzed using scanning electron microscopy (SEM). For example... Figure 1 , 2As shown, the coating adopts a composite system design, taking basalt flakes as the base to form a coating layer with a stable physical skeleton, high stability, and good impact resistance and wear resistance. Thanks to the corrosion resistance of basalt flakes and the dense barrier formed by the staggered arrangement of the flaky structure, the coating also performs well in corrosion resistance and can effectively resist environmental erosion.

[0030] The flaky basalt flakes are uniformly dispersed in the coating and also have a certain stress dispersion effect, which can enhance and toughen the coating. The use of polyether amine as the curing agent can offset the brittleness caused by the addition of basalt flakes, improve the toughness, impact resistance and flexibility of the coating. The combination of the two makes the coating resistant to the reciprocating stress and impact formed by waves, tides, currents and other dynamic corrosion environments.

[0031] In addition, the flaky structure of basalt flakes can also block the crack propagation path, avoid the formation of corrosion channels through the connection of micro-cracks generated after long-term protection, and play a role in progressive damage protection.

[0032] Basalt naturally contains iron oxides (FeO, FeO3, etc.) and conductive minerals (magnetite), so basalt flakes also have dielectric loss and magnetic loss capabilities. When applied in coatings, the staggered structure formed by the staggered arrangement of the flaky structure of basalt flakes can also extend the propagation path of electromagnetic waves, making the coating have a certain wave-absorbing property.

[0033] In the present application, carbon nanotubes (CNTs) and graphene materials are used to further improve the wave-absorbing performance of basalt flakes. When graphene is used for modification, graphene can be coated on the surface of basalt flakes by electrophoretic deposition, solution immersion and other methods.

[0034] Both graphene and carbon nanotubes can effectively improve the electrical conductivity of the coating, enhance the dielectric loss, improve the wave-absorbing property of the coating, and correspondingly improve the electromagnetic shielding ability and electromagnetic anti-interference ability of the coating.

[0035] Tests have found that the imaginary part of the dielectric constant (ε') of the fiber modified by carbon nanotubes is increased by 3-5 times. The coating has a minimum wave-absorbing reflection loss of -30dB to -60dB, has high wave-absorbing ability, and can effectively absorb electromagnetic waves of various frequencies in the frequency range of 6-18GHz.

[0036] Example 2:

[0037] On the basis of the above-mentioned example 1, the present application also provides a basalt flake reinforced corrosion-resistant coating formed by curing the above-mentioned basalt flake reinforced corrosion-resistant coating. The curing time of the coating at room temperature is 20-24 hours, and the coating thickness is 20-100μm.

[0038] The basalt flake reinforced anticorrosive coating comprehensively and balances stability, flexibility, corrosion resistance, wear resistance, impact resistance, dynamic adaptability and other performances, can build a long-acting protection system, effectively cope with the complex and changeable marine environment, and meet the comprehensive needs of marine equipment.

[0039] Embodiment 3:

[0040] On the basis of the above-mentioned embodiment 2, the application further provides a coated product, comprising a substrate and a coating layer attached to the surface of the substrate, wherein the coating layer is the above-mentioned basalt flake reinforced anticorrosive coating. The substrate can be a metal fastener, a small-sized part or component of an instrument, or a large structure or carrier such as a ship, a naval vessel or a marine wind power foundation structure. The coating layer is firmly attached to the substrate and can provide long-acting protection to the substrate to avoid the substrate from being eroded by the external environment.

[0041] Embodiment 4:

[0042] The application further provides a preparation method of the basalt flake reinforced anticorrosive coating for preparing the above-mentioned basalt flake reinforced anticorrosive coating. The preparation method comprises the following steps: S1. mixing and stirring epoxy resin, basalt flake and carbon nanotube according to the proportion for 4-8 hours to obtain a mixed slurry; S2. adding a curing agent into the mixed slurry according to the proportion and stirring for 4-10 hours to obtain the basalt flake reinforced anticorrosive coating.

[0043] In the case of using graphene modification, the following step S0 is further included before step S1: S0. coating graphene on the surface of the basalt flake.

[0044] Based on the preparation method, the whole coating preparation process is simple and easy to implement, and is beneficial to improving the production efficiency, realizing rapid mass production and reducing the production failure rate. During the production process, the coating quality is more stable and controllable, and the quality consistency of each batch of coating is good.

[0045] Embodiment 5:

[0046] The basalt flake reinforced anticorrosive coating is prepared by using the preparation method in the above-mentioned embodiment 4, and the coating is coated on the substrate to obtain a corresponding coated product. The specific steps are as follows:

[0047] (1) 10g of epoxy resin, 10g of basalt flake and 0.01g of carbon nanotube are weighed according to the proportion, mixed and stirred for 4 hours to obtain a mixed slurry;

[0048] (2) 3g of polyether amine curing agent is taken according to the proportion, added into the mixed slurry and stirred for 4 hours to obtain the basalt flake reinforced anticorrosive coating;

[0049] (3) a hacksaw blade is selected as the substrate, and the basalt flake reinforced anticorrosive coating with a thickness of 50μm is coated on the substrate;

[0050] (4) curing for 24 hours at the ventilated place to obtain a coated article with basalt flake reinforced anticorrosive coating.

[0051] Comparative Example 1:

[0052] A coated article with pure epoxy coating was prepared, and the specific steps were as follows:

[0053] (1) 10 g of epoxy resin and 3 g of polyether amine curing agent were weighed and mixed and stirred for 4 hours to obtain an epoxy coating;

[0054] (2) a cold-rolled steel plate was selected as the substrate, and the epoxy coating was coated on the substrate to a thickness of 50 μm;

[0055] (3) curing for 24 hours at the ventilated place to obtain a coated article with pure epoxy coating.

[0056] Comparative Example 2:

[0057] A basalt flake reinforced anticorrosive coating without modification of carbon nanotubes and graphene and a coated article thereof were prepared, and the specific steps were consistent with Example 5, except that no carbon nanotubes were added.

[0058] The coatings of Comparative Example 1, Comparative Example 2 and Example 5 were tested, and the test results are shown in the following table.

[0059]

[0060]

[0061] According to the test results, basalt flake can effectively improve the flexibility, hardness and wave absorption properties of the coating, and on this basis, the addition of carbon nanotubes further enhances the electrical conductivity and wave absorption properties of the coating.

[0062] Although the present application is specifically demonstrated and introduced in combination with preferred embodiments, it should be understood by those skilled in the art that various changes can be made to the present application in form and detail without departing from the spirit and scope of the present application as defined in the appended claims, and all such changes are within the protection scope of the present application.

Claims

1. A basalt flake reinforced anticorrosive coating, characterized by: The epoxy resin, the curing agent, basalt flakes and carbon nanotubes, the mass ratio of the epoxy resin to the curing agent is (1-4) : 1, the mass ratio of the basalt flakes to the epoxy resin is (0.4-1) : 1, and the mass ratio of the carbon nanotubes to the basalt flakes is (0.01-0.02) :

10.

2. The basalt flake reinforced anticorrosive coating according to claim 1, characterized in that: The curing agent is polyether amine.

3. The basalt flake reinforced anticorrosive coating as claimed in claim 1, wherein: The surface of the basalt flakes is coated with graphene.

4. A process for the preparation of basalt flake reinforced anticorrosive coating for the preparation of the basalt flake reinforced anticorrosive coating as claimed in any one of claims 1 to 3, characterized in that, The method comprises the following steps: S1. The epoxy resin, basalt flakes and carbon nanotubes are mixed and stirred according to the proportion for 4-8 hours to obtain a mixed slurry; S2. The curing agent is added into the mixed slurry according to the proportion and stirred for 4-10 hours to obtain the basalt flake reinforced anticorrosive coating.

5. The preparation method of the basalt flake reinforced anti-corrosion coating as described in claim 4, characterized in that, Before step S1, the following step is further included: S0. The surface of the basalt flakes is coated with graphene.

6. A basalt flake reinforced anticorrosive coating, characterized by: The coating is formed by curing the basalt flake reinforced anticorrosive coating according to any one of claims 1-3.

7. The basalt flake reinforced anticorrosive coating according to claim 6, characterized by: The thickness of the coating is 20-100 μm, and the curing time of the coating at normal temperature is 20-24 hours.

8. A coated article characterized by: The coating is formed by curing the basalt flake reinforced anticorrosive coating according to any one of claims 1-3. The coating is formed by curing the basalt flake reinforced anticorrosive coating according to any one of claims 1-3.

Images