Special chemical-resistant coating and preparation method thereof

Abstract

The invention discloses a special chemical-resistant coating and a preparation method thereof. The coating comprises a component A and a component B, the component A comprises organic-inorganic hybrid resin, a reactive diluent, a dispersing agent, a defoaming agent, a flatting agent, a rheological additive, a first inert flaky filler, a second inert flaky filler and an optional pigment; and the component B comprises high-functionality fatty amine, low-viscosity modified alicyclic amine and triethylene tetramine. The special chemical-resistant coating disclosed by the invention has excellent chemical resistance, especially acid and alkali resistance, does not contain a solvent, and is green, environment-friendly and safe.

Description

Technical Field

[0001] The present invention belongs to the technical field of chemical-resistant coatings, and more specifically, relates to a special chemical-resistant coating and a preparation method thereof. Background Art

[0002] Chemical-resistant coatings refer to coatings that are applied on substrates including steel and concrete and are in direct contact with chemicals such as acids, alkalis, solvents, and solutions to provide chemical resistance and protection. Application scenarios include the inner walls of storage tanks, pipelines, pools and other equipment and facilities in the fields of petroleum refining, fine chemicals, new energy, and sewage treatment.

[0003] Currently, the technologies used in chemical-resistant coatings are generally epoxy phenolics and vinyl esters. Epoxy phenolics are generally only resistant to low concentrations of acids and bases, alcohols, aliphatic hydrocarbons, and some aromatic hydrocarbons. However, they have limited tolerance to high concentrations of acids and bases, strong oxidizing acids, bases at high temperatures, and highly polar solvents. Furthermore, epoxy phenolics typically require baking or post-curing to achieve good chemical resistance. Vinyl esters are particularly resistant to acids and bases, especially acids, and are often used in high-temperature, wet, corrosive gases (such as flue gas desulfurization equipment). However, vinyl esters are generally mediocre in terms of alkali and solvent resistance. Furthermore, their formulations contain active styrene and peroxide as curing agents, both of which are explosive and flammable, posing significant safety risks during the coating application process. Furthermore, vinyl ester technology is based on free radical polymerization, which is significantly affected by temperature, resulting in rapid reaction and gelation, which can cause numerous inconveniences during coating. During on-site application, the mixing ratio must be adjusted according to the environment, and special care must be taken to operate before the gel time. Summary of the Invention

[0004] The purpose of the present invention is to provide a special chemical-resistant coating and a preparation method thereof. The special chemical-resistant coating of the present invention has excellent chemical resistance, especially acid and alkali resistance, does not contain solvents, and is green, environmentally friendly and safe.

[0005] In order to achieve the above-mentioned object, one aspect of the present invention provides a special chemical-resistant coating, which comprises: component A and component B;

[0006] The component A comprises: an organic-inorganic hybrid resin, a reactive diluent, a dispersant, a defoamer, a leveling agent, a rheological additive, a first inert flake filler, a second inert flake filler and an optional pigment;

[0007] The B component comprises: high-functionality fatty amine, low-viscosity modified alicyclic amine and triethylenetetramine.

[0008] According to the present invention, preferably, the component A comprises, by mass, 35-50 parts of an organic-inorganic hybrid resin, 2-4 parts of a reactive diluent, 0.2-0.6 parts of a dispersant, 0.1-0.3 parts of a defoamer, 0.2-0.6 parts of a leveling agent, 0.5-1 parts of a rheological additive, 5-15 parts of a first inert flaky filler, 5-15 parts of a second inert flaky filler, and 0-6 parts of a pigment;

[0009] Calculated by mass, the B component includes: 3-5 parts of high-functionality fatty amine, 5-10 parts of low-viscosity modified alicyclic amine and 8-12 parts of triethylenetetramine.

[0010] According to the present invention, preferably, the organic-inorganic hybrid resin is an organosilicon-modified epoxy resin.

[0011] In the present invention, an organic-inorganic hybrid resin is used. On the one hand, from the perspective of film-forming cross-linking and curing, the high-functionality resin allows the cured and cross-linked paint film to have very excellent chemical resistance; on the other hand, the combination of organic and inorganic allows the excellent corrosion resistance, heat resistance, wear resistance and other properties of inorganic substances to be simultaneously reflected with the good toughness and workability of organic substances, allowing the product to further improve chemical resistance, mechanical properties and workability.

[0012] According to the present invention, preferably, the active diluent is plant polyphenol glycidyl ether;

[0013] The dispersant is polyalkyleneimine modified with polyglycol polyester;

[0014] The defoamer is a polyolefin polymer-based non-silicon defoamer;

[0015] The leveling agent is a polymethyl alkylsiloxane solution;

[0016] The rheological additive is organic modified bentonite.

[0017] In the present invention, the organic modified bentonite is preferably BENTONE SD-2 from ELEMENTIS or HT-S307 from Heidis.

[0018] According to the present invention, preferably, the first inert flaky filler is glass flake;

[0019] The second inert plate-like filler is sericite.

[0020] In the present invention, two inert flaky fillers, glass flakes and sericite, are combined to enhance the chemical resistance and anti-penetration shielding capabilities of the paint film.

[0021] According to the present invention, preferably, the pigment comprises titanium dioxide and iron black; the mass ratio of the titanium dioxide and iron black is (3-10):1.

[0022] According to the present invention, preferably, the high-functionality fatty amine is an aliphatic polyamine polymer, and the functionality of the high-functionality fatty amine is 3-5;

[0023] Preferably, the high-functionality fatty amine is Ancamine 2422 produced by Evonik.

[0024] According to the present invention, preferably, the viscosity of the low-viscosity modified alicyclic amine at 25° C. is 300-500 cp;

[0025] Preferably, the low-viscosity modified alicyclic amine is Ancamine 2280 produced by Evonik.

[0026] In this invention, component B is a compound of a high-functionality fatty amine, a low-viscosity modified alicyclic amine, and triethylenetetramine. The high-functionality fatty amine provides excellent chemical resistance, room-temperature curing, and a long pot life. The low-viscosity modified alicyclic amine offers excellent chemical resistance and low-temperature curing properties, as well as resistance to water stains and oil stains. Triethylenetetramine, thanks to its chemical activity and cross-linking ability, forms a highly cross-linked three-dimensional network structure that not only enhances the coating's chemical resistance but also significantly improves its mechanical strength (such as hardness and wear resistance) while also facilitating low-temperature curing.

[0027] According to the present invention, preferably, the mass ratio of A to B is (3-5):1.

[0028] Another aspect of the present invention provides a method for preparing the above-mentioned coating, the preparation method comprising:

[0029] The organic-inorganic hybrid resin, reactive diluent, dispersant, defoamer, leveling agent, rheological additive, first inert flaky filler, second inert flaky filler and optional pigment are uniformly mixed to obtain the A component;

[0030] The high-functionality fatty amine, the low-viscosity modified alicyclic amine and triethylenetetramine are uniformly mixed to obtain the B component.

[0031] The technical solution of the present invention has the following beneficial effects:

[0032] (1) The special chemical-resistant coating of the present invention can withstand high concentrations of acids and bases, such as 98% sulfuric acid, 37% hydrochloric acid, 50% sodium hydroxide, etc., and can also withstand small molecular high-polarity solvents, such as dichloromethane, acetonitrile and tetrahydrofuran.

[0033] (2) The special chemical-resistant coating of the present invention can exhibit good chemical resistance without the need for baking or post-curing.

[0034] (3) The special chemical-resistant coating of the present invention is solvent-free, green, environmentally friendly and safe.

[0035] (4) The special chemical-resistant coating of the present invention can be applied by brushing, rolling, or spraying, and the construction requirements are consistent with solvent-free epoxy phenolic technology.

[0036] Other features and advantages of the present invention will be described in detail in the following detailed description. DETAILED DESCRIPTION

[0037] The preferred embodiments of the present invention will be described in more detail below. Although the preferred embodiments of the present invention are described below, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. Instead, these embodiments are provided to make the present invention more thorough and complete and to fully convey the scope of the present invention to those skilled in the art.

[0038] The present invention is further described below by way of examples:

[0039] In the following embodiments and comparative examples:

[0040] The organic-inorganic hybrid resin is silicone-modified epoxy resin purchased from Aikeli New Materials Co., Ltd. with the brand name TY-S02;

[0041] The active diluent was plant polyphenol glycidyl ether, purchased from Changshu Naisu Biotechnology, brand PLR602A;

[0042] The dispersant is a polyalkyleneimine modified with a polyglycol polyester, specifically DISPERBYK-2155 from BYK.

[0043] The defoamer is a polyolefin polymer-based non-silicone defoamer, specifically BYK-1790 from BYK Chemical;

[0044] The leveling agent is a polymethylalkylsiloxane solution, specifically BYK-077 from BYK Chemical;

[0045] The rheological additive is organically modified bentonite, specifically BENTONE SD-2 from ELEMENTIS;

[0046] Glass flakes were purchased from Noucheng Chemical with the brand name NCF-015;

[0047] Sericite was purchased from Chuzhou Gerui Mining, brand GA-2;

[0048] Titanium dioxide was purchased from Sichuan Longmang Titanium Industry with the brand name R-996;

[0049] Iron black was purchased from Shanghai Yipin Pigment, brand: Ultrafine Iron Oxide Black S330M;

[0050] The high-functionality fatty amine is an aliphatic polyamine polymer with a functionality of 4, purchased from Evonik under the brand name Ancamine 2422;

[0051] The low viscosity alicyclic amine has a viscosity of 450 cp at 25°C and is purchased from Evonik under the brand name Ancamine 2280.

[0052] Triethylenetetramine was purchased from Evonik under the brand name Ancamine TETA.

[0053] Example 1

[0054] This embodiment provides a special chemical-resistant coating, which includes: component A and component B;

[0055] Measured in parts by mass, the A component includes: 50 parts of organic-inorganic hybrid resin, 3 parts of PLR602A (active diluent), 0.5 parts of DISPERBYK-2155 (dispersant), 0.3 parts of BYK-1790 (defoaming agent), 0.6 parts of BYK-077 (leveling agent), 0.8 parts of BENTONE SD-2 (rheological additive), 10 parts of glass flakes (NCF-015), 10 parts of sericite (GA-2), 4 parts of titanium dioxide (R-996), and 0.8 parts of iron black (S330M);

[0056] In parts by mass, the B component includes: 5 parts of Ancamine 2422 (high-functionality fatty amine), 5 parts of Ancamine 2280 (low-viscosity alicyclic amine), and 10 parts of Ancamine TETA (triethylenetetramine).

[0057] The specific preparation method is as follows:

[0058] The organic-inorganic hybrid resin, reactive diluent, dispersant, defoamer, leveling agent, rheological additive, glass flakes, sericite, titanium dioxide and iron black are mixed uniformly to obtain the A component;

[0059] uniformly mixing a high-functionality aliphatic amine, a low-viscosity alicyclic amine and triethylenetetramine to obtain the B component;

[0060] Mix the above components A and B in a mass ratio of 4:1, apply at 25°C, and cure at 25°C for 7 days.

[0061] Example 2

[0062] This embodiment provides a special chemical-resistant coating, which includes: component A and component B;

[0063] Calculated by mass, the A component includes: 40 parts of organic-inorganic hybrid resin, 3 parts of PLR602A (active diluent), 0.5 parts of DISPERBYK-2155 (dispersant), 0.3 parts of BYK-1790 (defoaming agent), 0.6 parts of BYK-077 (leveling agent), 0.8 parts of BENTONE SD-2 (rheological additive), 15 parts of glass flakes (NCF-015), 15 parts of sericite (GA-2), 4 parts of titanium dioxide (R-996), and 0.8 parts of iron black (S330M);

[0064] In parts by mass, the B component includes: 5 parts of Ancamine 2422 (high-functionality fatty amine), 5 parts of Ancamine 2280 (low-viscosity alicyclic amine), and 10 parts of Ancamine TETA (triethylenetetramine).

[0065] The preparation method of this embodiment is the same as that of Example 1.

[0066] Mix the above components A and B in a mass ratio of 4:1, apply at 25°C, and cure at 25°C for 7 days.

[0067] Example 3

[0068] This embodiment provides a special chemical-resistant coating, which includes: component A and component B;

[0069] In parts by mass, the component A includes: 44.5 parts of organic-inorganic hybrid resin, 4 parts of PLR602A (active diluent), 0.6 parts of DISPERBYK-2155 (dispersant), 0.2 parts of BYK-1790 (defoaming agent), 0.4 parts of BYK-077 (leveling agent), 0.5 parts of BENTONE SD-2 (rheological additive), 10 parts of glass flakes (NCF-015), 10 parts of sericite (GA-2), 4 parts of titanium dioxide (R-996), and 0.8 parts of iron black (S330M);

[0070] Calculated by mass, the B component includes: 3 parts of Ancamine 2422 (high-functionality fatty amine), 10 parts of Ancamine 2280 (low-viscosity alicyclic amine), and 12 parts of Ancamine TETA (triethylenetetramine).

[0071] The preparation method of this embodiment is the same as that of Example 1.

[0072] Mix the above components A and B in a mass ratio of 3:1, apply at 25°C, and cure at 25°C for 7 days.

[0073] Comparative Example 1

[0074] This comparative example provides a chemical-resistant coating, which comprises: component A and component B;

[0075] The difference between the A component and Example 1 is that the organic-inorganic hybrid resin is replaced with Dow DEN 425 low-viscosity novolac epoxy resin;

[0076] The B component is the same as in Example 1.

[0077] The specific preparation method is as follows:

[0078] Dow DEN 425 low-viscosity phenolic epoxy resin, reactive diluent, dispersant, defoamer, leveling agent, rheological additive, glass flakes, sericite, titanium dioxide and iron black are mixed to obtain component A;

[0079] uniformly mixing a high-functionality aliphatic amine, a low-viscosity alicyclic amine and triethylenetetramine to obtain the B component;

[0080] Mix the above components A and B in a mass ratio of 4:1, apply at 25°C, and cure at 25°C for 7 days.

[0081] Comparative Example 2

[0082] This comparative example provides a chemical-resistant coating, which comprises: component A and component B;

[0083] The A component is the same as in Example 1;

[0084] The B component is Ancamine TETA (triethylenetetramine);

[0085] The specific preparation method is as follows:

[0086] The organic-inorganic hybrid resin, reactive diluent, dispersant, defoamer, leveling agent, rheological additive, glass flakes, sericite, titanium dioxide and iron black are mixed uniformly to obtain the A component;

[0087] Triethylenetetramine is used as component B;

[0088] Mix the above components A and B in a mass ratio of 4:1, apply at 25°C, and cure at 25°C for 7 days.

[0089] Test Case

[0090] The coating films from the above examples and comparative examples were tested (except the first item in Table 1) after curing at 25°C for 7 days. The specific testing methods refer to HGT 5572-2019, Acid-Resistant Anti-Corrosion Coatings for Interior Walls of Petrochemical Equipment. Specific test results are shown in Table 1. The first item in Table 1 represents the time taken to cure at 5°C after mixing components A and B according to the mixing ratios used in the above examples and comparative examples, applying at 5°C, and finally drying at 5°C.

[0091] Table 1

[0092]

[0093]

[0094] As can be seen from Table 1: Example 1 balances adhesion, chemical resistance, and mechanical properties by using a composite curing agent. Example 2 significantly improves chemical resistance and hardness by adding a high content of filler, while reducing impact toughness. Example 3 The low-viscosity system is more convenient to construct, achieving quick drying and maintaining acid and alkali resistance while slightly reducing adhesion and solvent resistance. Comparative Example 1 uses a conventional phenolic epoxy resin, which significantly reduces the chemical resistance and mechanical properties of the coating. Comparative Example 2 uses a single curing agent, which significantly reduces the chemical resistance and mechanical properties of the coating.

[0095] While various embodiments of the present invention have been described above, the above description is intended to be illustrative, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A special chemical-resistant coating, characterized in that: The coating comprises: component A and component B; The component A comprises: an organic-inorganic hybrid resin, a reactive diluent, a dispersant, a defoamer, a leveling agent, a rheological additive, a first inert flake filler, a second inert flake filler and an optional pigment; The B component comprises: high-functionality fatty amine, low-viscosity modified alicyclic amine and triethylenetetramine.

2. The coating according to claim 1, wherein Calculated by mass, the component A includes: 35-50 parts of an organic-inorganic hybrid resin, 2-4 parts of a reactive diluent, 0.2-0.6 parts of a dispersant, 0.1-0.3 parts of a defoamer, 0.2-0.6 parts of a leveling agent, 0.5-1 parts of a rheological additive, 5-15 parts of a first inert flaky filler, 5-15 parts of a second inert flaky filler, and 0-6 parts of a pigment; Calculated by mass, the B component includes: 3-5 parts of high-functionality fatty amine, 5-10 parts of low-viscosity modified alicyclic amine and 8-12 parts of triethylenetetramine.

3. The coating according to claim 1 or 2, wherein The organic-inorganic hybrid resin is an organosilicon-modified epoxy resin.

4. The coating according to claim 1 or 2, wherein The active diluent is plant polyphenol glycidyl ether; The dispersant is polyalkyleneimine modified with polyglycol polyester; The defoamer is a polyolefin polymer-based non-silicon defoamer; The leveling agent is a polymethyl alkylsiloxane solution; The rheological additive is organic modified bentonite.

5. The coating according to claim 1 or 2, wherein The first inert flaky filler is glass flake; The second inert plate-like filler is sericite.

6. The coating according to claim 1 or 2, wherein The pigment includes titanium dioxide and iron black; the mass ratio of the titanium dioxide to the iron black is (3-10):

1.

7. The coating according to claim 1 or 2, wherein The high-functionality fatty amine is an aliphatic polyamine polymer, and the functionality of the high-functionality fatty amine is 3-5; Preferably, the high-functionality fatty amine is Ancamine 2422 produced by Evonik.

8. The coating according to claim 1 or 2, wherein The low-viscosity modified alicyclic amine has a viscosity of 300-500 cp at 25°C; Preferably, the low-viscosity modified alicyclic amine is Ancamine 2280 produced by Evonik.

9. The coating according to claim 1 or 2, wherein The mass ratio of A and B is (3-5):

1.

10. The method for preparing the coating according to any one of claims 1 to 9, characterized in that: The preparation method comprises: The organic-inorganic hybrid resin, reactive diluent, dispersant, defoamer, leveling agent, rheological additive, first inert flaky filler, second inert flaky filler and optional pigment are uniformly mixed to obtain the A component; The high-functionality fatty amine, the low-viscosity modified alicyclic amine and triethylenetetramine are uniformly mixed to obtain the B component.

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