High solid heavy-duty modified epoxy paint and preparation method thereof

Abstract

The application relates to the technical field of paint, in particular to a high-solid heavy-duty modified epoxy paint and a preparation method thereof, which comprises a main paint and a curing agent, the main paint contains bisphenol A epoxy resin, bisphenol F epoxy resin, toughened epoxy resin, active diluent, functional filler and special anti-rust pigment, and the curing agent is a polyamide and modified alicyclic amine compound system, the paint has a solid content of greater than or equal to 90%, a VOC of less than or equal to 100 g / L, a single-coat film forming thickness of 500 micrometers, and excellent flexibility, fast drying property, cathode peeling resistance and long-acting corrosion resistance.

Description

Technical Field

[0001] This application relates to the technical field of coatings, and in particular to a high-solids-content, heavy-duty anti-corrosion modified epoxy paint and its preparation method. Background Technology

[0002] In the field of coating technology, epoxy heavy-duty anti-corrosion coatings are widely used for the protection of equipment and steel structures in harsh corrosive environments such as marine engineering, petrochemicals, and new energy due to their excellent adhesion and chemical resistance. With increasingly stringent environmental regulations, reducing volatile organic compound (VOC) emissions has become a mandatory industry requirement, and high-solids epoxy coatings have become the mainstream development direction because they can significantly reduce VOCs.

[0003] In existing technologies, high-solids-content heavy-duty anti-corrosion epoxy coatings are mainly achieved by increasing the resin and solids content and optimizing the pigment and filler system. However, high-solids-content coatings face several prominent drawbacks in practical applications. Specifically, firstly, increasing the solids content usually leads to a sharp increase in the viscosity of the system, resulting in poor workability, difficulty in leveling, and a tendency to produce defects such as "orange peel" and "pinholes," which seriously affect the appearance and protective integrity of the coating. To reduce the viscosity during application, a large amount of diluent is often added, which not only increases VOC emissions, violating the original intention of environmental protection, but also causes internal stress in the coating during the drying process, increasing the brittleness of the coating. Under thermal cycling or impact conditions, it is prone to micro-cracks or even peeling, ultimately reducing its long-term protective capability. Secondly, traditional epoxy resins have a high crosslinking density after curing, resulting in a hard and brittle coating with insufficient flexibility and impact resistance, making it difficult to meet the long-term protection requirements in extreme environments. Furthermore, existing high-solids-content epoxy paints generally suffer from slow drying speeds and short pot life after mixing. The former prolongs the construction cycle, while the latter easily leads to material waste during on-site construction. Summary of the Invention

[0004] To address the aforementioned deficiencies, this application provides a high-solids-content, heavy-duty anti-corrosion modified epoxy paint and its preparation method.

[0005] The above-mentioned objective of this application is achieved through the following technical solution:

[0006] A high-solids, heavy-duty anti-corrosion modified epoxy paint is composed of a main paint and a curing agent. By weight, the main paint comprises the following components:

[0007] 100-150 parts bisphenol A epoxy resin;

[0008] 50-100 parts of bisphenol F epoxy resin;

[0009] 50-100 parts toughened epoxy resin;

[0010] 20-30 parts reactive diluent;

[0011] 20-30 parts petroleum resin;

[0012] 1 to 5 parts dispersant;

[0013] 1 to 5 parts defoamer;

[0014] 20-30 parts titanium dioxide;

[0015] 50-100 parts of functional filler;

[0016] 50-100 parts of filler;

[0017] 30-50 parts of special anti-rust pigment;

[0018] 1 to 5 parts of silane coupling agent;

[0019] 20-30 parts plasticizer;

[0020] 1 to 5 parts of anti-sagging agent;

[0021] 20-30 parts solvent;

[0022] The curing agent comprises the following components:

[0023] 20-25 parts polyamide curing agent;

[0024] 50-100 parts of modified alicyclic amine.

[0025] Furthermore, the weight ratio of bisphenol A epoxy resin, bisphenol F epoxy resin and toughening epoxy resin in the main paint is 6:(3-4):(3-4).

[0026] Furthermore, the active diluent is selected from at least one of Changshu Naisu PLR603A and Green Home AGE.

[0027] Furthermore, the petroleum resin is selected from at least one of Lüttger LA300 and Jingtian New Materials JT-312.

[0028] Furthermore, the functional filler is flaky glass flakes with a mesh size of 100–325 mesh.

[0029] Furthermore, the filler is a mixture of 325-mesh precipitated barium sulfate, 1250-mesh mica powder and 1250-mesh silicon micro powder, wherein the weight ratio of precipitated barium sulfate, mica powder and silicon micro powder is (4-6):(2-4):1.

[0030] Furthermore, the special anti-rust pigment is selected from at least one of zinc phosphate, aluminum tripolyphosphate and zinc phosphomolybdate, wherein when the special anti-rust pigment is a mixture of zinc phosphate, aluminum tripolyphosphate and zinc phosphomolybdate, the weight ratio of zinc phosphate, aluminum tripolyphosphate and zinc phosphomolybdate is (1-3):(1-2):(1-2).

[0031] Furthermore, the silane coupling agent is selected from at least one of Momentive's MP-200 and A-187.

[0032] Furthermore, the plasticizer is selected from at least one of DOP and DMP.

[0033] The second objective of this invention is achieved through the following technical solution:

[0034] A method for preparing a high-solids content heavy-duty anti-corrosion modified epoxy paint includes the following steps:

[0035] S10: According to the formula, add bisphenol A epoxy resin, bisphenol F epoxy resin, toughening epoxy resin, reactive diluent, petroleum resin, dispersant, defoamer and solvent accounting for 60% to 80% of the total solvent volume into a stainless steel mixing tank in sequence, and disperse at a stirring speed of 600 to 800 r / min for 10 to 15 min to form a uniform and transparent base material.

[0036] S20: At a stirring speed of 800 r / min, add anti-sagging agent, titanium dioxide, filler, plasticizer and silane coupling agent in sequence, continue stirring for 15 min, then increase the speed to 1500 r / min, add special anti-rust pigment, disperse at high speed for 15 min to obtain premixed slurry;

[0037] S30: Transfer the premixed slurry to a sand mill and grind it to a fineness of ≤35μm;

[0038] S40: Return the ground slurry to the mixing tank, start the stirring at 400-600 r / min, add the functional filler, and stir for 10-15 min;

[0039] S50: Add the remaining solvent and filter through an 80-mesh vibrating screen to obtain the main paint;

[0040] S60: Add the polyamide curing agent and the modified cycloaliphatic amine to another container according to the formula, disperse at 600-800 r / min for 10 min, and filter through a 200 mesh filter to obtain the curing agent;

[0041] S70: Mix the main paint and the curing agent at a weight ratio of 5:1, then add 5% of the main paint weight of thinner, and stir evenly to obtain the high solids content heavy-duty anti-corrosion modified epoxy paint.

[0042] In summary, this invention, through the above-mentioned resin selection, curing agent compounding, filler gradient design, and step-by-step preparation process, can solve the technical problems of high-solids epoxy paints, such as high viscosity and difficult construction, brittleness and easy cracking, slow drying efficiency and low efficiency, rapid microporous penetration, weak cathodic disbondment, and difficulty in meeting VOC standards. It is suitable for the protection of harsh corrosive environments such as offshore platforms, cross-sea bridges, petrochemical storage tanks, and offshore wind power towers. Attached Figure Description

[0043] Figure 1 These are the pull-out adhesion test results of high-solids heavy-duty anti-corrosion modified epoxy paint samples 1-5 prepared in Examples 1-5 of this application;

[0044] Figure 2 These are the seawater immersion test results of the high solids content heavy-duty anti-corrosion modified epoxy paint samples 1-5 prepared in Examples 1-5 of this application;

[0045] Figure 3 These are the salt spray corrosion resistance test results of the high solids content heavy-duty anti-corrosion modified epoxy paint samples 1-5 prepared in Examples 1-5 of this application;

[0046] Figure 4 These are the cathodic disbondment resistance test results of high-solids heavy-duty anti-corrosion modified epoxy paint samples 1-5 prepared in Examples 1-5 of this application. Detailed Implementation

[0047] It should be noted that the following detailed descriptions are exemplary and intended to provide further illustration of the invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0048] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the present invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof. It should be understood that the scope of protection of the present invention is not limited to the specific embodiments described below; it should also be understood that the terminology used in the embodiments of the present invention is for the purpose of describing specific embodiments and not for limiting the scope of protection of the present invention.

[0049] As described in the background section, existing high-solids epoxy paints suffer from problems in practical applications, such as high application viscosity, poor flexibility, slow drying speed, short pot life, insufficient coating density, weak resistance to cathodic disbondment, and VOC emissions that are difficult to meet environmental protection requirements. To address these issues, this invention provides a high-solids heavy-duty anti-corrosion modified epoxy paint and its preparation method through synergistic design of the resin system, composite regulation of the curing agent, gradient compounding of functional fillers, and refined control of the preparation process.

[0050] In a first aspect, the present invention provides a high-solids-content, heavy-duty anti-corrosion modified epoxy paint, comprising a main paint and a curing agent, wherein the main paint comprises the following components by weight:

[0051] 100-150 parts bisphenol A epoxy resin;

[0052] 50-100 parts of bisphenol F epoxy resin;

[0053] 50-100 parts toughened epoxy resin;

[0054] 20-30 parts reactive diluent;

[0055] 20-30 parts petroleum resin;

[0056] 1 to 5 parts dispersant;

[0057] 1 to 5 parts defoamer;

[0058] 20-30 parts titanium dioxide;

[0059] 50-100 parts of functional filler;

[0060] 50-100 parts of filler;

[0061] 30-50 parts of special anti-rust pigment;

[0062] 1 to 5 parts of silane coupling agent;

[0063] 20-30 parts plasticizer;

[0064] 1 to 5 parts of anti-sagging agent;

[0065] 20-30 parts solvent;

[0066] The curing agent comprises the following components:

[0067] 20-25 parts polyamide curing agent;

[0068] 50-100 parts of modified alicyclic amine.

[0069] Preferably, the weight ratio of bisphenol A epoxy resin, bisphenol F epoxy resin, and toughening epoxy resin in the main paint is 6:(3-4):(3-4); wherein, the introduction of bisphenol F epoxy resin can reduce the overall viscosity of the system, while improving the crosslinking density and chemical resistance; further, the toughening epoxy resin is a carboxyl-terminated liquid nitrile rubber modified epoxy resin, selected from Huntsman Hypro1340 or Liansheng LSE-103-30, with an acrylonitrile content of 18%-22% and an epoxy equivalent of 450-550 g / eq. This component will form a sea-island structure microphase separation during the curing process, giving the coating ductility and impact resistance, and can effectively inhibit the propagation of microcracks caused by thermal stress or mechanical vibration.

[0070] Preferably, the reactive diluent is selected from at least one of Changshu Naisu PLR603A and Green Home AGE; wherein, the reactive diluent is a monofunctional glycidyl ether compound selected from at least one of Changshu Naisu PLR603A and Green Home AGE, which participates in the curing reaction, is non-volatile, and is used to adjust the initial viscosity of the system to avoid VOC exceeding the standard by using non-reactive solvents.

[0071] Preferably, the petroleum resin is selected from at least one of Lüttger LA300 and Jingtian New Materials JT-312; wherein the petroleum resin is a C5 / C9 copolymer aliphatic petroleum resin, selected from at least one of Lüttger LA300 and Jingtian New Materials JT-312, with a softening point of 90-110℃ and an acid value of less than 1mgKOH / g. This component has good compatibility with epoxy resin, can reduce the surface tension of the system, improve leveling, and enhance the wetting and adhesion ability to low surface energy substrates (such as sandblasted carbon steel and concrete).

[0072] Preferably, the functional filler is flaky glass flakes with a mesh size of 100-325. The glass flakes are arranged in parallel overlapping patterns in the coating to create a maze-like barrier path, which can extend the penetration path of corrosive media such as water, oxygen, and chloride ions, thereby improving the barrier performance.

[0073] Preferably, the filler is a mixture of 325-mesh precipitated barium sulfate, 1250-mesh mica powder, and 1250-mesh silica powder, wherein the weight ratio of precipitated barium sulfate, mica powder, and silica powder is (4-6):(2-4):1; specifically, precipitated barium sulfate provides volume filling and abrasiveness, mica powder has a flake structure, which can further enhance barrier properties, and silica powder has spherical inorganic particles, which can reduce internal stress and improve coating density.

[0074] Preferably, the special anti-rust pigment is selected from at least one of zinc phosphate, aluminum tripolyphosphate, and zinc phosphomolybdate. When the special anti-rust pigment is a mixture of zinc phosphate, aluminum tripolyphosphate, and zinc phosphomolybdate, the weight ratio of zinc phosphate, aluminum tripolyphosphate, and zinc phosphomolybdate is (1-3):(1-2):(1-2). Specifically, aluminum tripolyphosphate hydrolyzes to generate polyphosphate ions, which form a dense passivation film with metal cations. Zinc phosphate provides corrosion inhibition, while zinc phosphomolybdate has both redox buffer and cathodic inhibition functions. Their synergistic effect can improve electrochemical stability and enhance resistance to cathodic disbondment.

[0075] Preferably, the silane coupling agent is selected from at least one of Momentive's MP-200 and A-187; specifically, the silane coupling agent is at least one of γ-glycidoxypropyltrimethoxysilane and N-β-(aminoethyl)-γ-aminopropylmethyldimethoxysilane, namely A-187 and MP-200, and its addition amount is 1 to 5 parts. This component forms a chemical bond at the interface between epoxy resin and inorganic filler, improving the dispersion stability of filler and coating adhesion, especially in humid or salt spray environments, it can maintain interface integrity.

[0076] Preferably, the plasticizer is selected from at least one of DOP and DMP; specifically, the plasticizer is at least one of dioctyl phthalate (DOP) and dimethyl phthalate (DMP), with a molecular weight of 278-390 and a boiling point above 300°C. This component can be embedded in the cross-linked network to reduce the glass transition temperature, improve low-temperature toughness, and prevent the coating from becoming brittle under thermal cycling.

[0077] Preferably, the anti-sagging agent is at least one of polyamide wax powder and fumed silica, and the amount added is 1 to 5 parts; wherein, the polyamide wax powder deassociates under shear force to achieve thixotropic control; the fumed silica provides structural strength through a hydrogen bond network, and the two work together to ensure that there is no sagging or settling when a single coat is 500 μm thick.

[0078] Preferably, the solvent is a high-boiling-point environmentally friendly solvent, selected from diethylene glycol butyl ether, propylene glycol methyl ether acetate or a mixture thereof, with a boiling point range of 200-250°C and a VOC contribution rate of less than 10%. This solvent is only used to adjust the viscosity during the grinding stage, and the residual amount in the final product is controlled within the range of total VOC ≤ 100 g / L.

[0079] Preferably, the polyamide curing agent is selected from Air Chemical 115 or Danbao Resin 650, with an amine value of 200-250 mgKOH / g and a viscosity of 8000-12000 mPa·s (25°C); the modified alicyclic amine is selected from Air Chemical 2726 or Junjiang Technology D6973, with an active hydrogen equivalent of 40-60 g / eq and a viscosity of 300-600 mPa·s (25°C); wherein, the polyamide provides a long pot life and flexibility, and the modified alicyclic amine provides rapid curing and high crosslinking density.

[0080] Secondly, the present invention provides a method for preparing a high-solids-content heavy-duty anti-corrosion modified epoxy paint, comprising the following steps:

[0081] S10: According to the formula, add bisphenol A epoxy resin, bisphenol F epoxy resin, toughening epoxy resin, reactive diluent, petroleum resin, dispersant, defoamer and solvent accounting for 60% to 80% of the total solvent volume into a stainless steel mixing tank in sequence, and disperse at a stirring speed of 600 to 800 r / min for 10 to 15 min to form a uniform and transparent base material.

[0082] S20: At a stirring speed of 800 r / min, add anti-sagging agent, titanium dioxide, filler, plasticizer and silane coupling agent in sequence, continue stirring for 15 min, then increase the speed to 1500 r / min, add special anti-rust pigment, disperse at high speed for 15 min to obtain premixed slurry;

[0083] S30: Transfer the premixed slurry to a sand mill and grind it to a fineness of ≤35μm;

[0084] S40: Return the ground slurry to the mixing tank, start the stirring at 400-600 r / min, add the functional filler, and stir for 10-15 min;

[0085] S50: Add the remaining solvent and filter through an 80-mesh vibrating screen to obtain the main paint;

[0086] S60: Add the polyamide curing agent and the modified cycloaliphatic amine to another container according to the formula, disperse at 600-800 r / min for 10 min, and filter through a 200 mesh filter to obtain the curing agent;

[0087] S70: Mix the main paint and the curing agent at a weight ratio of 5:1, then add 5% of the main paint weight of thinner, and stir evenly to obtain the high solids content heavy-duty anti-corrosion modified epoxy paint.

[0088] Preferably, in step S10, the dispersant is selected from at least one of BYK-182 and BYK-110, and its molecular structure contains multiple anchoring groups, which can be adsorbed onto the surface of various inorganic pigments and fillers to prevent flocculation; the defoamer is selected from at least one of BYK-051 and Evcona 2620-85D, and is a polyether-modified siloxane, which can eliminate microbubbles generated during high-speed dispersion and avoid pinhole defects.

[0089] Preferably, in step S20, the filler and special anti-rust pigment are added in stages. First, high-density filler (such as barium sulfate) is added to establish the basic rheology, and then active anti-rust pigment is added to avoid the latter being over-coated and losing its corrosion inhibition effect.

[0090] Preferably, in step S40, the glass flakes are added separately after grinding, because their flake structure is easily broken during the sand milling process. Mixing them separately at low speed can maintain their aspect ratio and orientation, thereby maximizing the barrier effect.

[0091] Preferably, the diluent is selected from at least one of propylene glycol methyl ether acetate and diethylene glycol butyl ether.

[0092] The following examples further illustrate the present invention, but do not constitute a limitation thereof. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0093] The raw materials used in the following examples are all commercially available, including:

[0094] The bisphenol A epoxy resin is selected from at least one of Nan Ya 128 and Phoenix E51;

[0095] Bisphenol F epoxy resin is selected from at least one of Phoenix 830 and Nanya 170;

[0096] The toughening epoxy resin is selected from at least one of Huntsman Hypro 1340 and Liansheng LSE-103-30;

[0097] The reactive diluent is selected from at least one of Changshu Naisu PLR603A and Green Home AGE;

[0098] The petroleum resin is selected from at least one of Lüttger LA300 and Jingtian New Materials JT-312;

[0099] The defoamer is selected from at least one of BYK's BYK-051 and Evcona 2620-85D;

[0100] The dispersant is selected from at least one of BYK-182 and BYK-110 from BYK Corporation;

[0101] The titanium dioxide was selected from DuPont's R-996;

[0102] The functional filler is selected from at least one of 100-mesh glass flakes and 325-mesh glass flakes;

[0103] The filler is selected from a mixture of 325-mesh precipitated barium sulfate, 1250-mesh mica powder, and 1250-mesh silica powder;

[0104] Special anti-rust pigments are selected from at least one of aluminum tripolyphosphate, zinc phosphate, and zinc phosphomolybdate;

[0105] The silane coupling agent is selected from at least one of Momentive's MP-200 and A-187;

[0106] The plasticizer is selected from at least one of DOP and DMP;

[0107] The anti-sagging agent is selected from at least one of polyamide wax powder and atmospheric silica.

[0108] The polyamide curing agent is selected from at least one of Air Chemical 115 and Danbao Resin 650;

[0109] The modified alicyclic amine is selected from at least one of Air Chemical 2726 and Junjiang Technology D6973.

[0110] Example 1

[0111] A high-solids-content, heavy-duty anti-corrosion modified epoxy paint sample 1, composed of a main paint and a curing agent, wherein the main paint comprises the following components by weight:

[0112] 100 parts bisphenol A epoxy resin; 50 parts bisphenol F epoxy resin; 50 parts toughening epoxy resin; 20 parts reactive diluent; 20 parts petroleum resin; 2 parts dispersant; 2 parts defoamer; 20 parts titanium dioxide; 40 parts functional filler; 90 parts filler; 50 parts special anti-rust pigment; 3 parts silane coupling agent; 20 parts plasticizer; 5 parts anti-sagging agent; 30 parts solvent;

[0113] The curing agent comprises the following components: 20 parts polyamide curing agent; 50 parts modified alicyclic amine.

[0114] The preparation of sample 1 of the high-solids heavy-duty anti-corrosion modified epoxy paint in Example 1 includes:

[0115] S10: According to the formula, add bisphenol A epoxy resin, bisphenol F epoxy resin, toughening epoxy resin, reactive diluent, petroleum resin, dispersant, defoamer and solvent accounting for 80% of the total solvent volume into a stainless steel mixing tank in sequence, and disperse at a stirring speed of 800r / min for 15min to form a uniform and transparent base material.

[0116] S20: At a stirring speed of 800 r / min, add anti-sagging agent, titanium dioxide, filler, plasticizer and silane coupling agent in sequence, continue stirring for 15 min, then increase the speed to 1500 r / min, add special anti-rust pigment, disperse at high speed for 15 min to obtain premixed slurry;

[0117] S30: Transfer the premixed slurry to a sand mill and grind it to a fineness of ≤35μm;

[0118] S40: Return the ground slurry to the mixing tank, start the stirring at 600r / min, add the functional filler, and stir for 15min;

[0119] S50: Add the remaining solvent and filter through an 80-mesh vibrating screen to obtain the main paint;

[0120] S60: Add the polyamide curing agent and the modified cycloaliphatic amine to another container according to the formula, disperse at 800 r / min for 10 min, and filter through a 200 mesh filter to obtain the curing agent;

[0121] S70: Mix the main paint and the hardener at a weight ratio of 5:1, then add 5% of the main paint weight of thinner, stir evenly to obtain sample 1.

[0122] Example 2

[0123] A high-solids-content, heavy-duty anti-corrosion modified epoxy paint sample 2, composed of a main paint and a curing agent, wherein the main paint comprises the following components by weight:

[0124] 100 parts bisphenol A epoxy resin; 50 parts bisphenol F epoxy resin; 50 parts toughening epoxy resin; 20 parts reactive diluent; 20 parts petroleum resin; 2 parts dispersant; 2 parts defoamer; 20 parts titanium dioxide; 50 parts functional filler; 90 parts filler; 50 parts special anti-rust pigment; 3 parts silane coupling agent; 20 parts plasticizer; 5 parts anti-sagging agent; 30 parts solvent;

[0125] The curing agent comprises the following components: 20 parts polyamide curing agent; 50 parts modified alicyclic amine.

[0126] The preparation method of the high solids content heavy-duty anti-corrosion modified epoxy paint in Example 2 is the same as that in Example 1, and Sample 2 is obtained.

[0127] Example 3

[0128] A high-solids-content, heavy-duty anti-corrosion modified epoxy paint sample 3, composed of a main paint and a curing agent, wherein the main paint comprises the following components by weight:

[0129] 150 parts bisphenol A epoxy resin; 100 parts bisphenol F epoxy resin; 100 parts toughening epoxy resin; 30 parts reactive diluent; 30 parts petroleum resin; 3 parts dispersant; 3 parts defoamer; 30 parts titanium dioxide; 90 parts functional filler; 110 parts filler; 50 parts special anti-rust pigment; 5 parts silane coupling agent; 30 parts plasticizer; 5 parts anti-sagging agent; 30 parts solvent;

[0130] The curing agent comprises the following components: 25 parts polyamide curing agent; 100 parts modified alicyclic amine.

[0131] The preparation method of the high solids content heavy-duty anti-corrosion modified epoxy paint in Example 3 is the same as that in Example 1, and sample 3 is obtained.

[0132] Example 4

[0133] 150 parts bisphenol A epoxy resin; 100 parts bisphenol F epoxy resin; 100 parts toughening epoxy resin; 30 parts reactive diluent; 30 parts petroleum resin; 3 parts dispersant; 3 parts defoamer; 30 parts titanium dioxide; 100 parts functional filler; 100 parts filler; 50 parts special anti-rust pigment; 5 parts silane coupling agent; 30 parts plasticizer; 5 parts anti-sagging agent; 30 parts solvent;

[0134] The curing agent comprises the following components: 25 parts polyamide curing agent; 100 parts modified alicyclic amine.

[0135] The preparation method of the high solids content heavy-duty anti-corrosion modified epoxy paint in Example 4 is the same as that in Example 1, and sample 4 is obtained.

[0136] Example 5

[0137] 120 parts bisphenol A epoxy resin; 75 parts bisphenol F epoxy resin; 75 parts toughening epoxy resin; 25 parts reactive diluent; 25 parts petroleum resin; 3 parts dispersant; 3 parts defoamer; 25 parts titanium dioxide; 75 parts functional filler; 100 parts filler; 50 parts special anti-rust pigment; 4 parts silane coupling agent; 15 parts plasticizer; 5 parts anti-sagging agent; 30 parts solvent;

[0138] The curing agent comprises the following components: 20 parts polyamide curing agent; 75 parts modified alicyclic amine.

[0139] The preparation method of the high solids content heavy-duty anti-corrosion modified epoxy paint in Example 5 is the same as that in Example 1, and sample 5 is obtained.

[0140] Table 1 shows the specific components of the main paint and curing agent in samples 1-5 of Examples 1-5.

[0141]

[0142]

[0143]

[0144] Table 1

[0145] The high-solids-content, heavy-duty anti-corrosion modified epoxy paint samples 1-5 prepared in Examples 1-5 were fabricated using an airless spraying device, and their performance was tested. The performance test results are shown in Table 2, and some performance test experimental results are shown in the figure. Figures 1-4 .

[0146] Performance testing Test Standards index Example 1 Example 2 Example 3 Example 4 Example 5 Thickness, μm GB / T13452.2 ≥400 392～420 386～413 405～421 400～426 413～427 Pull-out adhesion, MPa ISO4624 ≥5 12.05 11.93 13.5 12.69 8.35 Salt spray resistance, hr GB / T1771 4200hr, no bubbling, rusting, cracking or peeling. 4200hr, no bubbling, rusting, cracking or peeling. 4200hr, no bubbling, rusting, cracking or peeling. 4200hr, no bubbling, rusting, cracking or peeling. 4200hr, no bubbling, rusting, cracking or peeling. 4200hr, no bubbling, rusting, cracking or peeling. Seawater immersion resistant GB / T9274 No blistering, rusting, cracking, or peeling. No blistering, rusting, cracking, or peeling. No blistering, rusting, cracking, or peeling. No blistering, rusting, cracking, or peeling. No blistering, rusting, cracking, or peeling. No blistering, rusting, cracking, or peeling. Impact resistance GB / T1723 ≥50cm 50Kg / cm100μm 50Kg / cm100μm 50Kg / cm100μm 50Kg / cm100μm 50Kg / cm100μm Abrasion resistance, (1000g / 1000r) / mg GB / T1798 ≤100 46 54 48 45 41 Cathodic disbondment resistant (sandblasted steel plate) ISO15711 4200h, missed spots ≤20mm, pull-out adhesion around missed spots ≥5Mpa 4200h, equivalent peel radius 5.9mm, adhesion 7.5MPa 4200h, equivalent peel radius 6.1mm, adhesion 7.9MPa 4200h, equivalent peel radius 6.4mm, adhesion 7.5MPa 4200h, equivalent peel radius 5.6mm, adhesion 6.4MPa 4200h, equivalent peel radius 5.1mm, adhesion 6.2MPa Solid content GB / T1725 ≥90 92 92 92 92 92 VOC GB / T23985 ≤200 79 79 78 78 78 Heavy metal content (lead, cadmium, hexavalent chromium, mercury) GB24408 Lead, cadmium, and hexavalent chromium ≤100, cadmium ≤100 Not detected Not detected Not detected Not detected Not detected

[0147] Table 2

[0148] As shown in Table 2, the samples 1-5 prepared in Examples 1-5 all performed excellently in all core performance indicators, fully achieving and exceeding the preset targets. In terms of basic physical properties, the coating thickness of all samples was close to or exceeded the requirement of 400 micrometers, and the pull-out adhesion far exceeded the index of ≥5MPa, reaching a maximum of 13.5MPa, proving that the coating has extremely strong adhesion to the substrate.

[0149] In the critical corrosion resistance tests, samples 1-5 all successfully passed the 4200-hour salt spray corrosion test and seawater immersion test without blistering, rusting, cracking, or peeling, demonstrating their excellent barrier protection capabilities. Furthermore, in the cathodic disbondment test, the equivalent disbondment radius of samples 1-5 was controlled below 6.4 mm, far below the standard of ≤20 mm, and the adhesion around the disbondment hole remained above 6.2 MPa, fully verifying the excellent electrochemical stability and anti-disbondment ability of this formulation system in the marine high-salt electrolyte environment.

[0150] In addition, the coating exhibits good flexibility and impact resistance (impact resistance ≥50cm) and excellent abrasion resistance (abrasion loss as low as 41mg), indicating that it has good physical and mechanical strength and durability. In terms of environmental protection, the coating has a solid content of up to 92%, a VOC content of only 78-79g / L, which is far below the standard of ≤200g / L, and no heavy metals were detected, fully meeting the current most stringent environmental protection regulations.

[0151] In summary, this solution, through the compounding of specific resin, curing agent, functional filler, and additive system, can successfully solve the common technical problems of high-solids coatings, such as high viscosity, poor toughness, slow curing, and insufficient long-term protection. It achieves a balance of high solids content, low VOC, strong adhesion, extreme corrosion resistance, and excellent construction adaptability, providing a long-lasting, reliable, and environmentally friendly heavy-duty anti-corrosion solution for extreme corrosive environments such as marine engineering and petrochemicals.

[0152] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A high-solids-content, heavy-duty, anti-corrosion modified epoxy paint, characterized in that, Composed of a base paint and a hardener, the base paint comprises the following components by weight: 100-150 parts bisphenol A epoxy resin; 50-100 parts of bisphenol F epoxy resin; 50-100 parts toughened epoxy resin; 20-30 parts reactive diluent; 20-30 parts petroleum resin; 1 to 5 parts dispersant; 1 to 5 parts defoamer; 20-30 parts titanium dioxide; 50-100 parts of functional filler; 50-100 parts of filler; 30-50 parts of special anti-rust pigment; 1 to 5 parts of silane coupling agent; 20-30 parts plasticizer; 1 to 5 parts of anti-sagging agent; 20-30 parts solvent; The curing agent comprises the following components: 20-25 parts polyamide curing agent; 50-100 parts of modified alicyclic amine.

2. The high-solids-content, heavy-duty anti-corrosion modified epoxy paint according to claim 1, characterized in that: The weight ratio of bisphenol A epoxy resin, bisphenol F epoxy resin and toughening epoxy resin in the main paint is 6:(3-4):(3-4).

3. The high-solids-content, heavy-duty anti-corrosion modified epoxy paint according to claim 1, characterized in that: The active diluent is selected from at least one of Changshu Naisu PLR603A and Green Home AGE.

4. The high-solids-content heavy-duty anti-corrosion modified epoxy paint according to claim 1, characterized in that: The petroleum resin is selected from at least one of Lüttger LA300 and Jingtian New Materials JT-312.

5. The high-solids-content heavy-duty anti-corrosion modified epoxy paint according to claim 1, characterized in that: The functional filler is flaky glass flakes with a mesh size of 100–325.

6. The high-solids-content heavy-duty anti-corrosion modified epoxy paint according to claim 1, characterized in that: The filler is a mixture of 325-mesh precipitated barium sulfate, 1250-mesh mica powder and 1250-mesh silicon micro powder, wherein the weight ratio of precipitated barium sulfate, mica powder and silicon micro powder is (4-6):(2-4):

1.

7. The high-solids-content heavy-duty anti-corrosion modified epoxy paint according to claim 1, characterized in that: The special anti-rust pigment is selected from at least one of zinc phosphate, aluminum tripolyphosphate and zinc phosphomolybdate. When the special anti-rust pigment is a mixture of zinc phosphate, aluminum tripolyphosphate and zinc phosphomolybdate, the weight ratio of zinc phosphate, aluminum tripolyphosphate and zinc phosphomolybdate is (1-3):(1-2):(1-2).

8. The high-solids-content heavy-duty anti-corrosion modified epoxy paint according to claim 1, characterized in that: The silane coupling agent is selected from at least one of Momentive's MP-200 and A-187.

9. The high-solids-content heavy-duty anti-corrosion modified epoxy paint according to claim 1, characterized in that: The plasticizer is selected from at least one of DOP and DMP.

10. A method for preparing a high-solids-content, heavy-duty anti-corrosion modified epoxy paint, characterized in that, Including the following steps: S10: According to the formula, add bisphenol A epoxy resin, bisphenol F epoxy resin, toughening epoxy resin, reactive diluent, petroleum resin, dispersant, defoamer and solvent accounting for 60% to 80% of the total solvent volume into a stainless steel mixing tank in sequence, and disperse at a stirring speed of 600 to 800 r / min for 10 to 15 min to form a uniform and transparent base material. S20: At a stirring speed of 800 r / min, add anti-sagging agent, titanium dioxide, filler, plasticizer and silane coupling agent in sequence, continue stirring for 15 min, then increase the speed to 1500 r / min, add special anti-rust pigment, disperse at high speed for 15 min to obtain premixed slurry; S30: Transfer the premixed slurry to a sand mill and grind it to a fineness of ≤35μm; S40: Return the ground slurry to the mixing tank, start the stirring at 400-600 r / min, add the functional filler, and stir for 10-15 min; S50: Add the remaining solvent and filter through an 80-mesh vibrating screen to obtain the main paint; S60: Add the polyamide curing agent and the modified cycloaliphatic amine to another container according to the formula, disperse at 600-800 r / min for 10 min, and filter through a 200 mesh filter to obtain the curing agent; S70: Mix the main paint and the curing agent at a weight ratio of 5:1, then add 5% of the main paint weight of thinner, and stir evenly to obtain the high solids content heavy-duty anti-corrosion modified epoxy paint.

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