Ballast tank coating as well as preparation method and application thereof

Abstract

The invention relates to the technical field of paint coatings, and provides a ballast tank paint and a preparation method and application thereof.The ballast tank paint is composed of a component A and a component B. The mass ratio of the component A to the component B is 100: (5.1-7.4), the component A comprises 10-20 parts of I-type bisphenol A epoxy resin, 10-20 parts of II-type bisphenol A epoxy resin, 41-68 parts of pigment filler, 2.3-4.5 parts of auxiliaries and 10-12 parts of solvent, and the component A is obtained after three times of dispersing and stirring; the component B is an epoxy resin curing agent; and uniformly mixing and stirring the component A and the component B to obtain the ballast tank coating. The coating prepared by the invention has excellent mechanical properties, salt spray resistance, cathodic disbonding resistance, high and low temperature resistance and the like, and the raw materials and reaction products in the coating do not contain harmful substances, so that the influence on constructors and the environment is avoided.

Description

Technical Field

[0001] The present invention belongs to the technical field of paint coatings, and in particular relates to a ballast tank paint, a preparation method thereof, and an application thereof. Background Art

[0002] The primary function of ballast tanks is to ensure the stability, draft, and navigation performance of ships under different loading conditions by regulating the injection and discharge of ballast water. However, ballast tanks are exposed to alternating dry and wet marine atmospheric conditions for long periods of time, leading to severe corrosion.

[0003] Ballast tank coatings have emerged to effectively address ballast tank corrosion. As an economical and effective protective measure, coatings form a continuous protective film on the metal surface of ballast tanks, isolating seawater, oxygen, and other corrosive media, thereby slowing the onset of corrosion. With the continuous advancement of materials science and coatings technology, various new ballast tank coatings have been developed, and their performance has been gradually improved, including enhanced coating adhesion, corrosion resistance, and cathodic disbonding resistance.

[0004] Despite this, current ballast tank coatings still have many problems. For example: (1) In the complex and changing marine environment, the service life of most coatings is short, and the long-term protective performance needs to be further improved; (2) Products with longer service life are expensive and difficult to achieve large-scale application; (3) Some coatings contain harmful substances, which will cause harm to the environment and construction workers during the construction process and are no longer suitable for continued use. Therefore, it is urgent to develop a coating product with better performance, environmental protection and economy, which is of great significance to ensure the safe operation of ships, extend the service life of ships and reduce shipping costs. Summary of the Invention

[0005] The purpose of the present invention is to overcome the problems in the prior art of ballast tank coatings, such as insufficient service life, high cost of products that meet performance requirements, and the presence of harmful substances in the coatings, and to provide a ballast tank coating, a preparation method, and an application thereof.

[0006] The purpose of the present invention is to solve the problem through the following technical solutions:

[0007] In a first aspect, the present invention provides a ballast tank coating comprising:

[0008] (5.1~7.4) component A and component B,

[0009] The component A comprises the following ingredients in parts by weight:

[0010] 10-20 parts of type I bisphenol A epoxy resin, 10-20 parts of type II bisphenol A epoxy resin, 41-68 parts of pigments and fillers, 2.3-4.5 parts of additives, and 10-12 parts of solvents;

[0011] The B component is 5.1 to 7.4 parts by weight of epoxy resin curing agent.

[0012] Furthermore, the type I bisphenol A epoxy resin is 601 epoxy resin.

[0013] Furthermore, the type II bisphenol A epoxy resin is 828 epoxy resin.

[0014] Furthermore, the pigment filler is composed of aluminum silver paste, mica powder, silicon powder and mica iron oxide, wherein:

[0015] 6-8 parts of the aluminum-silver paste, 15-25 parts of mica powder, 15-25 parts of silicon powder, and 5-10 parts of mica iron oxide;

[0016] The size of the silicon micropowder is 800 mesh, the size of the mica powder is 600 mesh, the size of the mica iron oxide is 325 mesh, and the model of the aluminum-silver paste is ZNA-110 produced by Shandong Yinjian Metal Pigments Co., Ltd.

[0017] Furthermore, the auxiliary agent is composed of organic bentonite, silane coupling agent, dispersant, defoamer and leveling agent, wherein,

[0018] 1 to 1.5 parts of the organic bentonite, 1 to 1.5 parts of the silane coupling agent, 0.1 to 0.5 parts of the dispersant, 0.1 to 0.5 parts of the defoaming agent, and 0.1 to 0.5 parts of the leveling agent;

[0019] The dispersant is BYK-104S dispersant produced by BYK in Germany, the defoamer is BYK-085 defoamer produced by BYK in Germany, the leveling agent is BYK-390 leveling agent produced by BYK in Germany, the silane coupling agent is Dow Corning silane coupling agent 6040, and the organic bentonite is HFGEL-140SF organic bentonite produced by Zhejiang Fenghong.

[0020] Furthermore, the solvent is a mixed solution of xylene and n-butanol, and the mass ratio of xylene to n-butanol in the mixed solution is 7:3.

[0021] Furthermore, the epoxy resin curing agent is a modified alicyclic amine curing agent, which is R-5911-8 produced by Rich Chemical Co., Ltd.

[0022] In a second aspect, the present invention provides a method for preparing a ballast tank coating. The method comprises the following steps, based on the components and raw materials included in the ballast tank coating and the corresponding weight portions of the components and raw materials:

[0023] S1. Preparation of component A: First, type I bisphenol A epoxy resin, type II bisphenol A epoxy resin, additives, and solvent are dispersed and stirred for a first time to obtain a first resin slurry. Then, silicon micropowder, mica powder, and mica iron oxide are sequentially placed into the first resin slurry and dispersed and stirred for a second time to obtain a second resin slurry. Finally, aluminum silver paste is added to the second resin slurry and dispersed and stirred for a third time to obtain component A.

[0024] S2. Preparation of ballast tank coating: Component A and component B prepared in S1 are mixed and stirred in a mass ratio of 100:(5.1-7.4) to obtain ballast tank coating.

[0025] Furthermore, the rotation speed of the first dispersion stirring is 1000-1500 r / min, and the dispersion time is 10-15 min; the rotation speed of the second dispersion stirring is 1500-2500 r / min, and the dispersion time is 10-20 min; the rotation speed of the third dispersion stirring is 300-600 r / min, and the dispersion time is 10-20 min; the mixing stirring is carried out by manual stirring, and the stirring time is 1-2 min.

[0026] In a third aspect, the present invention provides an application of a ballast tank coating, wherein the ballast tank coating is used for protecting the inner wall of a ship's ballast tank, an offshore platform steel structure, or an oil and gas pipeline;

[0027] The ballast tank coating is applied to the surface of the substrate by spraying, roller coating or brushing, and is cured at room temperature to form a coating with a thickness of 80-200 μm.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] 1. The present invention uses a mixture of a macromolecular epoxy resin and a small molecular epoxy resin as the main film-forming substance, and uses a modified alicyclic amine curing agent to prepare a ballast tank coating. The coating has excellent mechanical properties, salt spray resistance, cathodic disbonding resistance, high and low temperature resistance, etc., and its performance meets the performance indicators specified in the "Performance Standard for Protective Coatings of Ship Ballast Tanks" (PSPC); since the coating prepared by the coating of the present invention has excellent salt spray resistance, the coating has a long service life in the marine environment; and the raw materials and reaction products in the coating do not contain harmful substances, so the coating is an environmentally friendly coating that will not affect construction personnel and the environment.

[0030] 2. The present invention uses a mixture of a large molecular epoxy resin and a small molecular epoxy resin as the main film-forming substance, and a modified alicyclic amine curing agent to prepare a ballast tank coating; wherein the large molecular epoxy resin and the small molecular epoxy resin are both bisphenol A type epoxy resins, and the epoxy groups are both at both ends of the molecular chain segment. The main difference is reflected in the length of the chain segment between the two epoxy groups. The molecular chain segment of the large molecular epoxy resin is longer. After reacting with the modified alicyclic amine curing agent, the cross-linking sites of the coating are far apart, and the anti-corrosion performance is relatively poor, but the coating has excellent flexibility; the molecular chain segment of the small molecular epoxy resin is shorter. After reacting with the modified alicyclic amine curing agent, the cross-linking sites of the coating are close to each other, the coating has a high cross-linking density, and excellent anti-corrosion performance, but the coating is relatively brittle; therefore, two epoxy resins with different molecular weights are compounded to make the coating have certain mechanical properties and anti-corrosion properties.

[0031] 3. The present invention uses a modified alicyclic amine curing agent as a supporting curing agent. Due to the particularity of the modified alicyclic amine curing agent, its amino group is located in the alicyclic side chain, and the side chain contains multiple methylene groups, so that its side chain is a long straight chain, wherein the alicyclic group increases the cross-linking density and improves the anti-corrosion performance, and the long straight chain side group provides flexibility, so that after the modified alicyclic amine curing agent reacts with the epoxy resin, its coating has excellent anti-corrosion performance and flexibility; and because the long straight chain and alicyclic group in the modified alicyclic amine are both hydrophobic groups, the curing agent and the resin have excellent moisture resistance and excellent adhesion on the wet interface.

[0032] 4. The present invention uses flaky structural materials such as aluminum silver paste and mica powder as fillers to extend the medium penetration distance, thereby improving the coating's resistance to medium penetration; aluminum powder is a more active metal with a lower standard electrode potential than iron. It can act as a sacrificial anode in the coating, reacting preferentially with the corrosive medium, thereby protecting the metal substrate from corrosion and inhibiting the occurrence of cathode stripping. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The accompanying drawings are incorporated in and constitute a part of this specification and, together with the description, serve to explain the principles of the invention.

[0034] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0035] Figure 1 is a flow chart of a method for preparing a ballast tank coating according to the present invention;

[0036] Figure 2This is a graph showing the impact strength test results of the coating formed by the ballast tank coating of the present invention;

[0037] Figure 3 This is a graph showing the test results of the coating flexibility formed by the ballast tank coating of the present invention;

[0038] Figure 4 1 is a graph showing the test results of neutral salt spray of the coating formed by the ballast tank coating of the present invention;

[0039] Figure 5 This is a graph showing the results of a cathodic disbonding resistance test of a coating formed by the ballast tank coating of the present invention. DETAILED DESCRIPTION

[0040] Exemplary embodiments will be described in detail herein, with examples illustrated in the accompanying drawings. In the following description, when referring to the drawings, identical numerals in different figures represent identical or similar elements, unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all possible embodiments consistent with the present invention. Instead, they are merely examples consistent with certain aspects of the present invention as detailed in the appended claims.

[0041] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the present invention is described in further detail below with reference to the accompanying drawings and embodiments.

[0042] The invention provides a ballast tank coating, which consists of a component A and a component B in a mass ratio of 100:(5.1-7.4).

[0043] Among them, component A includes the following ingredients in parts by weight: 10 to 20 parts of type I bisphenol A epoxy resin, 10 to 20 parts of type II bisphenol A epoxy resin, 41 to 68 parts of pigments and fillers, 2.3 to 4.5 parts of additives, and 10 to 12 parts of solvents.

[0044] Type I bisphenol A epoxy resin is 601 epoxy resin, which is a large molecular epoxy resin with a molecular weight of ≥2000; Type II bisphenol A epoxy resin is 828 epoxy resin, which is a small molecular epoxy resin with a molecular weight of ≤500.

[0045] The pigments and fillers are composed of aluminum-silver paste, mica powder, silica micropowder and mica iron oxide, among which, the aluminum-silver paste is 6 to 8 parts, the mica powder is 15 to 25 parts, the silica micropowder is 15 to 25 parts, and the mica iron oxide is 5 to 10 parts; the size of the silica micropowder is 800 mesh, the size of the mica powder is 600 mesh, and the size of the mica iron oxide is 325 mesh. The model of the aluminum-silver paste is ZNA-110 produced by Shandong Yinjian Metal Pigments Co., Ltd.

[0046] The additives are composed of organic bentonite, silane coupling agent, dispersant, defoaming agent and leveling agent, among which, the organic bentonite is 1 to 1.5 parts, the silane coupling agent is 1 to 1.5 parts, the dispersant is 0.1 to 0.5 parts, the defoaming agent is 0.1 to 0.5 parts, and the leveling agent is 0.1 to 0.5 parts; the dispersant is BYK-104S dispersant produced by BYK in Germany, the defoaming agent is BYK-085 defoaming agent produced by BYK in Germany, the leveling agent is BYK-390 leveling agent produced by BYK in Germany, the model of the silane coupling agent is Dow Corning silane coupling agent 6040, and the model of the organic bentonite is HFGEL-140SF organic bentonite produced by Zhejiang Fenghong.

[0047] The solvent is a mixed solution of xylene and n-butanol, and the mass ratio of xylene to n-butanol in the mixed solution is 7:3.

[0048] Component B is 5.1 to 7.4 parts by weight of epoxy resin curing agent, and the epoxy resin curing agent is a modified alicyclic amine curing agent, R-5911-8 produced by Rich Chemical Co., Ltd.

[0049] The above materials can be purchased on the market.

[0050] The present invention provides a method for preparing a ballast tank coating, referring to Figure 1 As shown, this preparation method is based on the component raw materials included in the ballast tank coating and the corresponding weight parts of the component raw materials, and specifically includes the following steps:

[0051] S1. Preparation of Component A: First, add Type I bisphenol A epoxy resin, Type II bisphenol A epoxy resin, additives, and solvent to a dispersing and stirring vessel and perform a first dispersion and stirring at a speed of 1000-1500 r / min for 10-15 minutes to obtain a first resin slurry. This ensures that the organobentonite in the additive is evenly dispersed in the first resin slurry. Then, add the silica powder, mica powder, and micaceous iron oxide in the pigments and fillers to the first resin slurry in sequence. Perform a second dispersion and stirring at a speed of 1500-2500 r / min for 10-20 minutes to obtain a second resin slurry. Finally, add the aluminum-silver paste in the pigments and fillers to the second resin slurry and perform a third dispersion and stirring at a speed of 300-600 r / min for 10-20 minutes to obtain Component A.

[0052] S2. Preparation of ballast tank coating: Component A and component B prepared in S1 are manually stirred in a mass ratio of 100:(5.1-7.4) for 1-2 minutes until uniformly stirred to obtain the ballast tank coating.

[0053] When in use, the ballast tank paint is sprayed, rolled or brushed on the surface of the substrate and cured at room temperature to form a corresponding coating with a thickness of 80-200 μm.

[0054] In order to further verify the performance of the ballast tank coating prepared by the present invention, the following examples are provided for further explanation:

[0055] The ballast tank coatings in Examples 1-5 are selected according to the weight parts of the corresponding ingredients in Table 1 below.

[0056] Table 1 Weight parts of each component corresponding to each embodiment

[0057]

[0058] Example 1

[0059] This embodiment 1 provides a ballast tank coating, which is composed of component A and component B in a mass ratio of 100:7.4.

[0060] Component A, calculated by weight, includes the following ingredients: 10 parts of bisphenol A epoxy resin type I, 20 parts of bisphenol A epoxy resin type II, 6 parts of aluminum paste, 15 parts of mica powder, 15 parts of silica powder, 10 parts of micaceous iron oxide, 1.5 parts of organic bentonite, 1.5 parts of silane coupling agent, 0.4 parts of dispersant, 0.3 parts of defoamer, 0.3 parts of leveling agent, and 10 parts of solvent. Component B, calculated by weight, includes 7.4 parts of epoxy resin curing agent.

[0061] This embodiment provides a method for preparing a ballast tank coating, which specifically includes the following steps:

[0062] S1. Preparation of Component A: First, add Type I bisphenol A epoxy resin, Type II bisphenol A epoxy resin, additives, and solvent to a dispersing and stirring vessel and perform a first dispersion and stirring at a speed of 1000 r / min for 15 minutes to obtain a first resin slurry. The organic bentonite in the additive is uniformly dispersed in the first resin slurry. Then, the silica powder, mica powder, and micaceous iron oxide in the pigments and fillers are sequentially added to the first resin slurry and a second dispersion and stirring is performed at a speed of 1500 r / min for 20 minutes to obtain a second resin slurry. Finally, the aluminum-silver paste in the pigments and fillers is added to the second resin slurry and a third dispersion and stirring is performed at a speed of 300 r / min for 20 minutes to obtain Component A.

[0063] S2. Preparation of ballast tank coating: Component A and component B prepared in S1 were manually stirred at a mass ratio of 100:7.4 for 2 minutes until uniformly mixed to obtain the ballast tank coating.

[0064] The ballast tank paint is sprayed on the surface of the ship's ballast tank and cured at room temperature to obtain a ballast tank paint coating with a thickness of 80 μm.

[0065] Example 2

[0066] This embodiment 2 provides a ballast tank coating, which consists of component A and component B in a mass ratio of 100:6.8.

[0067] Component A, calculated by weight, includes the following ingredients: 12.5 parts of bisphenol A epoxy resin type I, 17.5 parts of bisphenol A epoxy resin type II, 6 parts of aluminum paste, 22.3 parts of mica powder, 18 parts of silica powder, 10 parts of mica iron oxide, 1.4 parts of organic bentonite, 1 part of silane coupling agent, 0.1 part of dispersant, 0.1 part of defoamer, 0.1 part of leveling agent, and 11 parts of solvent. Component B, calculated by weight, includes 6.8 parts of epoxy resin curing agent.

[0068] This embodiment provides a method for preparing a ballast tank coating, which specifically includes the following steps:

[0069] S1. Preparation of Component A: First, add Type I bisphenol A epoxy resin, Type II bisphenol A epoxy resin, additives, and solvent to a dispersing and stirring vessel and perform a first dispersion and stirring at a speed of 1100 r / min for 14 minutes to obtain a first resin slurry. The organic bentonite in the additive is uniformly dispersed in the first resin slurry. Then, the silica powder, mica powder, and micaceous iron oxide in the pigments and fillers are sequentially added to the first resin slurry and a second dispersion and stirring is performed at a speed of 1700 r / min for 18 minutes to obtain a second resin slurry. Finally, the aluminum-silver paste in the pigments and fillers is added to the second resin slurry and a third dispersion and stirring is performed at a speed of 400 r / min for 18 minutes to obtain Component A.

[0070] S2. Preparation of ballast tank coating: Component A and component B prepared in S1 were manually stirred at a mass ratio of 100:6.8 for 1.5 min. After stirring evenly, the ballast tank coating was obtained.

[0071] The ballast tank paint is sprayed on the surface of the ship's ballast tank and cured at room temperature to obtain a ballast tank paint coating with a thickness of 100 μm.

[0072] Example 3

[0073] This embodiment 3 provides a ballast tank coating, which is composed of component A and component B in a mass ratio of 100:6.2.

[0074] Component A, calculated by weight, includes the following ingredients: 15 parts of bisphenol A epoxy resin type I, 15 parts of bisphenol A epoxy resin type II, 7 parts of aluminum paste, 23 parts of mica powder, 20.5 parts of silica powder, 5 parts of micaceous iron oxide, 1.3 parts of organic bentonite, 1.3 parts of silane coupling agent, 0.3 parts of dispersant, 0.3 parts of defoamer, 0.3 parts of leveling agent, and 11 parts of solvent. Component B, calculated by weight, includes 6.2 parts of epoxy resin curing agent.

[0075] This embodiment provides a method for preparing a ballast tank coating, which specifically includes the following steps:

[0076] S1. Preparation of Component A: First, add Type I bisphenol A epoxy resin, Type II bisphenol A epoxy resin, additives, and solvent to a dispersing and stirring vessel and perform a first dispersion and stirring at a speed of 1200 r / min for 13 minutes to obtain a first resin slurry. The organic bentonite in the additive is uniformly dispersed in the first resin slurry. Then, the silica powder, mica powder, and micaceous iron oxide in the pigments and fillers are sequentially added to the first resin slurry and a second dispersion and stirring is performed at a speed of 2000 r / min for 15 minutes to obtain a second resin slurry. Finally, the aluminum-silver paste in the pigments and fillers is added to the second resin slurry and a third dispersion and stirring is performed at a speed of 450 r / min for 15 minutes to obtain Component A.

[0077] S2. Preparation of ballast tank coating: Component A and component B prepared in S1 were manually stirred at a mass ratio of 100:6.2 for 1 min. After stirring evenly, the ballast tank coating was obtained.

[0078] The ballast tank paint is sprayed on the surface of the ship's ballast tank and cured at room temperature to obtain a ballast tank paint coating with a thickness of 150 μm.

[0079] Example 4

[0080] This embodiment 4 provides a ballast tank coating, which is composed of component A and component B in a mass ratio of 100:5.7.

[0081] Component A, calculated by weight, includes the following ingredients: 17.5 parts of bisphenol A epoxy resin type I, 12.5 parts of bisphenol A epoxy resin type II, 7 parts of aluminum paste, 25 parts of mica powder, 15 parts of silica powder, 7.2 parts of micaceous iron oxide, 1.2 parts of organic bentonite, 1.4 parts of silane coupling agent, 0.4 parts of dispersant, 0.4 parts of defoamer, 0.4 parts of leveling agent, and 12 parts of solvent. Component B, calculated by weight, includes 5.7 parts of epoxy resin curing agent.

[0082] This embodiment provides a method for preparing a ballast tank coating, which specifically includes the following steps:

[0083] S1. Preparation of Component A: First, add Type I bisphenol A epoxy resin, Type II bisphenol A epoxy resin, additives, and solvent to a dispersing and stirring vessel and perform a first dispersion and stirring at a speed of 1300 r / min for 12 minutes to obtain a first resin slurry. The organic bentonite in the additive is uniformly dispersed in the first resin slurry. Then, the silica powder, mica powder, and micaceous iron oxide in the pigments and fillers are sequentially added to the first resin slurry and a second dispersion and stirring is performed at a speed of 2200 r / min for 12 minutes to obtain a second resin slurry. Finally, the aluminum-silver paste in the pigments and fillers is added to the second resin slurry and a third dispersion and stirring is performed at a speed of 500 r / min for 13 minutes to obtain Component A.

[0084] S2. Preparation of ballast tank coating: Component A and component B prepared in S1 were manually stirred at a mass ratio of 100:5.7 for 2 minutes until uniformly mixed to obtain the ballast tank coating.

[0085] The ballast tank paint is sprayed on the surface of the ship's ballast tank and cured at room temperature to obtain a ballast tank paint coating with a thickness of 180 μm.

[0086] Example 5

[0087] This embodiment 5 provides a ballast tank coating, which consists of component A and component B in a mass ratio of 100:5.1.

[0088] Component A, calculated by weight, includes the following ingredients: 20 parts of bisphenol A epoxy resin type I, 10 parts of bisphenol A epoxy resin type II, 8 parts of aluminum paste, 24 parts of mica powder, 15 parts of silica powder, 7 parts of micaceous iron oxide, 1 part of organic bentonite, 1.5 parts of silane coupling agent, 0.5 parts of dispersant, 0.5 parts of defoamer, 0.5 parts of leveling agent, and 12 parts of solvent. Component B, calculated by weight, includes 5.1 parts of epoxy resin curing agent.

[0089] This embodiment provides a method for preparing a ballast tank coating, which specifically includes the following steps:

[0090] S1. Preparation of Component A: First, add Type I bisphenol A epoxy resin, Type II bisphenol A epoxy resin, additives, and solvent to a dispersing and stirring vessel and perform a first dispersion and stirring at a speed of 1500 r / min for 10 minutes to obtain a first resin slurry. The organic bentonite in the additive is uniformly dispersed in the first resin slurry. Then, the silica powder, mica powder, and micaceous iron oxide in the pigments and fillers are sequentially added to the first resin slurry and a second dispersion and stirring is performed at a speed of 2500 r / min for 10 minutes to obtain a second resin slurry. Finally, the aluminum-silver paste in the pigments and fillers is added to the second resin slurry and a third dispersion and stirring is performed at a speed of 600 r / min for 10 minutes to obtain Component A.

[0091] S2. Preparation of ballast tank coating: Component A and component B prepared in S1 were manually stirred at a mass ratio of 100:5.1 for 1 min. After stirring evenly, the ballast tank coating was obtained.

[0092] The ballast tank paint is sprayed on the surface of the ship's ballast tank and cured at room temperature to obtain a ballast tank paint coating with a thickness of 200 μm.

[0093] Performance Testing

[0094] In order to verify the performance of the ballast tank coating obtained in the above embodiments, the following test method was used for testing. The test results are shown in Table 2 and the attached Figure 2-5 .

[0095] The solid content test method for ballast tank coatings is to measure the prepared samples in accordance with the standard GB / T 1725-2007 "Paints, varnishes and plastics - Determination of non-volatile matter content".

[0096] The volatile organic compound content test method for ballast tank coatings is to measure the prepared samples in accordance with the standard GB / T 23986-2009 "Paints and varnishes - Determination of volatile organic compound (VOC) content - Gas chromatography method".

[0097] The ballast tank coating flexibility test method is based on GB / T 1731-1993 "Determination of paint film flexibility" to test the prepared samples.

[0098] The impact test method for ballast tank coatings is to test the prepared samples in accordance with the standard GB / T 1732-1993 "Determination of impact resistance of paint films".

[0099] The neutral salt spray resistance test method for ballast tank coatings is carried out according to the standard GB / T 1771-2007 "Paints and varnishes - Determination of resistance to neutral salt spray" on the prepared samples.

[0100] The cathodic disbonding resistance test method for ballast tank coatings is carried out on the prepared samples in accordance with the standard GB / T 7790-2008 "Paints and varnishes - Determination of resistance to cathodic disbonding of coatings exposed to seawater".

[0101] The test method for the alternating temperature resistance of ballast tank coatings is to measure the prepared samples in accordance with the standard JG / T 25-2017 "Test method for temperature change resistance of architectural coatings".

[0102] The test method for ballast tank wave tank simulation experiment of ballast tank coating is carried out on the prepared samples in accordance with the standard of GB / T6823-2008 "Ship Ballast Tank Paint".

[0103] The condensation tank simulation test method for ballast tank coatings is carried out according to the standard GB / T 6823-2008 "Ship Ballast Tank Paints".

[0104] Table 2 Performance test results of ballast tank coatings in various embodiments

[0105]

[0106] From the test results of Examples 1-5, it can be seen that by using high molecular weight epoxy resin and low molecular weight epoxy resin as the main film-forming substances, using aluminum powder and flaky mica powder in the aluminum-silver paste to improve the coating's resistance to media penetration and cathodic disbonding resistance, and finally using a modified alicyclic amine curing agent to further improve the coating's anti-corrosion and mechanical properties, the performance index requirements for ship ballast tank coatings set forth in PSPC can be met.

[0107] The test results of Examples 1-5 show that the coating of Example 2 exhibits the best cathodic disbonding resistance. This is due to the optimal combination of high-molecular-weight epoxy resin and low-molecular-weight epoxy resin with the modified alicyclic amine at this ratio, resulting in both excellent corrosion resistance and mechanical properties. Further adjustments to the ratio of high-molecular-weight epoxy resin to low-molecular-weight epoxy resin would disrupt this balance. Increasing the amount of high-molecular-weight epoxy resin enhances the mechanical properties of the coating, but correspondingly reduces its corrosion resistance. Increasing the amount of low-molecular-weight epoxy resin enhances its corrosion resistance, but deteriorates its mechanical properties.

[0108] It can be seen from the test results of Examples 1-5 that when the addition amount of high molecular weight epoxy resin increases, the cathodic stripping resistance of the coating will decrease. Comparing the experimental results of Examples 3-5, the cathodic stripping resistance of Example 5 is lower than that of Example 4. This is because the addition of aluminum-silver paste also has a corresponding effect on the cathodic stripping resistance of the coating. Within a certain range, the higher the addition amount of aluminum-silver paste, the better the cathodic stripping resistance of the coating.

[0109] The test results of Examples 1-5 demonstrate that the ballast tank coating prepared according to the present invention exhibits excellent salt spray resistance. After 5000 hours of neutral salt spray resistance, the coating exhibited no blistering, no peeling, and no rusting, exhibited adhesion ≥6 MPa, and had a VOC ≤280 g / L. This further demonstrates that the coating exhibits excellent mechanical properties, salt spray resistance, cathodic disbonding resistance, and high and low temperature resistance. Furthermore, the coating contains no harmful substances in its raw materials or reaction products, making it environmentally friendly and harmless to construction workers and the environment.

[0110] The foregoing description is intended only to provide specific embodiments of the present invention, which will enable those skilled in the art to understand and implement the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention.

[0111] It should be understood that the present invention is not limited to the above description and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. A ballast tank coating, characterized in that: It is composed of component A and component B with a mass ratio of 100:(5.1~7.4). The component A comprises the following ingredients in parts by weight: 10-20 parts of type I bisphenol A epoxy resin, 10-20 parts of type II bisphenol A epoxy resin, 41-68 parts of pigments and fillers, 2.3-4.5 parts of additives, and 10-12 parts of solvents; The B component is 5.1 to 7.4 parts by weight of epoxy resin curing agent.

2. The ballast tank coating according to claim 1, characterized in that: The type I bisphenol A epoxy resin is 601 epoxy resin.

3. The ballast tank coating according to claim 1, characterized in that: The type II bisphenol A epoxy resin is 828 epoxy resin.

4. The ballast tank coating according to claim 1, characterized in that: The pigments and fillers are composed of aluminum silver paste, mica powder, silicon powder and mica iron oxide, wherein: The aluminum-silver paste is 6 to 8 parts, mica powder is 15 to 25 parts, silicon powder is 15 to 25 parts, and mica iron oxide is 5 to 10 parts.

5. The ballast tank coating according to claim 1, characterized in that: The auxiliary agent is composed of organic bentonite, silane coupling agent, dispersant, defoamer and leveling agent, wherein: The organic bentonite is 1 to 1.5 parts, the silane coupling agent is 1 to 1.5 parts, the dispersant is 0.1 to 0.5 parts, the defoaming agent is 0.1 to 0.5 parts, and the leveling agent is 0.1 to 0.5 parts.

6. The ballast tank coating according to claim 1, characterized in that: The solvent is a mixed solution of xylene and n-butanol, and the mass ratio of xylene to n-butanol in the mixed solution is 7:

3.

7. The ballast tank coating according to claim 1, characterized in that: The epoxy resin curing agent is a modified alicyclic amine curing agent.

8. A method for preparing a ballast tank coating, characterized in that: The preparation method is based on the component raw materials included in the ballast tank coating according to any one of claims 1 to 7 and the corresponding weight parts of the component raw materials, and specifically comprises the following steps: S1. Preparation of component A: First, type I bisphenol A epoxy resin, type II bisphenol A epoxy resin, additives, and solvent are dispersed and stirred for a first time to obtain a first resin slurry. Then, silicon micropowder, mica powder, and mica iron oxide are sequentially placed into the first resin slurry and dispersed and stirred for a second time to obtain a second resin slurry. Finally, aluminum silver paste is added to the second resin slurry and dispersed and stirred for a third time to obtain component A. S2. Preparation of ballast tank coating: Component A and component B prepared in S1 are mixed and stirred in a mass ratio of 100:(5.1-7.4) to obtain ballast tank coating.

9. The method for preparing the ballast tank coating according to claim 8, characterized in that: The first dispersion stirring speed is 1000-1500 r / min, and the dispersion time is 10-15 min; The second dispersion stirring speed is 1500-2500 r / min, and the dispersion time is 10-20 min; The rotation speed of the third dispersing stirring is 300-600 r / min, and the dispersing time is 10-20 min; the stirring time of the mixing stirring is 1-2 min.

10. An application of the ballast tank coating according to any one of claims 1 to 7, characterized in that: The ballast tank coating is used for protecting the inner wall of ship ballast tanks, offshore platform steel structures or oil and gas pipelines; The ballast tank coating is applied to the surface of the substrate by spraying, roller coating or brushing, and is cured at room temperature to form a coating with a thickness of 80-200 μm.

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