Epoxy resin anticorrosive paint and preparation method thereof

Abstract

The invention relates to the technical field of coatings, and discloses an epoxy resin anticorrosive coating and a preparation method thereof, the epoxy resin anticorrosive coating is composed of a component A and a component B, wherein the component A comprises the following raw materials: epoxy resin, anti-corrosion mica powder, a flatting agent, an antioxidant, an ultraviolet light absorber and acetone; the component B comprises the following raw materials: an anti-aging curing agent, acetone and a simethicone defoaming agent, and the anti-corrosion mica powder and the anti-aging curing agent participate in the preparation process of the epoxy resin coating, so that the prepared epoxy resin coating can effectively block the permeation of a corrosive medium, and meanwhile, the surface energy of the coating is reduced; and anti-aging small molecule vanillyl alcohol is added into the anti-aging curing agent in a chemical bonding manner, so that the prepared epoxy resin coating can have an excellent anti-aging effect, and the service life of the epoxy resin coating is effectively prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of coatings, and in particular to an epoxy resin anti-corrosion coating and a preparation method thereof. Background Art

[0002] Epoxy resin coating is a protective coating with excellent mechanical strength and adhesion. It plays an important role in projects such as shipbuilding, oil pipelines, and bridge steel structures. This type of coating forms a three-dimensional network structure through cross-linking and curing, which effectively blocks the penetration of water vapor and corrosive media, providing protection for the substrate. However, with the increasingly harsh operating environment of industrial equipment, the limitations of the use of traditional epoxy resin coatings are becoming increasingly prominent, especially in high salt fog environments. Epoxy resin coatings not only have to withstand electrochemical corrosion from chloride ions, but also need to resist molecular chain degradation caused by expansion stress caused by wet and hot cycles. The superposition of multiple destructive factors has greatly shortened the service life of epoxy resin coatings.

[0003] Patent publication number CN101260273B discloses a flexible epoxy anti-corrosion coating, which includes the following raw materials: polyether polyurethane epoxy resin, anti-rust pigment filler, modified curing agent, additives, and diluent. The epoxy anti-corrosion coating prepared by the above components not only maintains the good adhesion and anti-corrosion ability of the epoxy anti-corrosion coating, but also can improve the toughness of the epoxy anti-corrosion coating. In particular, the toughness of the coating after being soaked in seawater is greatly improved compared with conventional epoxy coatings. However, the patent does not improve the aging resistance of the epoxy anti-corrosion coating, and the service life of the epoxy anti-corrosion coating in a humid and hot environment needs to be improved. Summary of the Invention

[0004] The purpose of the present invention is to provide an epoxy resin anti-corrosion coating and a preparation method thereof, which solves the problem that ordinary epoxy resin coatings have weak anti-corrosion ability and are easy to age, thus affecting their service life.

[0005] The purpose of the present invention can be achieved through the following technical solutions: An epoxy resin anticorrosive coating consists of two parts: component A and component B; the component A comprises the following raw materials in parts by weight: 60-80 parts of epoxy resin, 8-10 parts of anticorrosive mica powder, 1-2 parts of leveling agent, 2-3 parts of antioxidant, 1-3 parts of ultraviolet absorber, and 130-150 parts of acetone; the component B comprises the following raw materials in parts by weight: 10-15 parts of anti-aging curing agent, 50-60 parts of acetone, and 1-2 parts of defoaming agent.

[0006] Furthermore, the epoxy resin is bisphenol A epoxy resin; the leveling agent is any one of a polyurethane leveling agent and a water-based silicone leveling agent; the antioxidant is any one of antioxidant 1010, antioxidant 168, and antioxidant 3114; the ultraviolet absorber is any one of ultraviolet absorber UV-120 and ultraviolet absorber UV-1164; and the defoaming agent is a dimethyl silicone oil defoaming agent.

[0007] Furthermore, the preparation method of the anti-corrosion mica powder comprises the following steps: S1: Dimethylvinylchlorosilane, allyl furoate, and trifluoroethyl methacrylate are placed in anhydrous ethanol, mixed evenly, and then an initiator is added. The mixture is heated to 60-65°C and reacted for 5-6 hours. The product is collected after vacuum distillation to obtain an anti-corrosion composite. S2: After drying the mica powder at 200-220° C. for 1-1.5 hours, place it in toluene, ultrasonically disperse it for 10-15 minutes, introduce nitrogen, add the anti-corrosion compound and triethylamine, heat the mixture under reflux, and then centrifuge to obtain the anti-corrosion mica powder after washing and drying.

[0008] In this scheme, dimethylvinylchlorosilane, allyl furoate, and trifluoroethyl methacrylate undergo free radical polymerization under the action of an initiator to obtain an anti-corrosion composite. Then, under the action of triethylamine, the hydroxyl groups on the surface of the mica powder react with the silicon-chlorine groups in the structure of the anti-corrosion composite to obtain anti-corrosion mica powder. This anti-corrosion mica powder uses mica powder as a core and can block the penetration of corrosive media through its unique lamellar structure. The composite medium containing organic silicon, organic fluorine, and furfuryl is chemically bonded to the surface of the flaky mica powder to form a dense chemical protective layer. The organic silicon can enhance the hydrophobicity of the coating, the organic fluorine can reduce the surface energy, and the furfuryl has chemical stability. The synergistic effect of multiple anti-corrosion mechanisms is achieved through organic-inorganic hybridization, so that the prepared epoxy resin coating has extremely strong anti-corrosion properties.

[0009] Furthermore, in step S1, the initiator is any one of benzoyl peroxide, dicumyl peroxide, and azobisisobutyronitrile.

[0010] Furthermore, in step S2, the time of the temperature rising reflux reaction is 8-12 hours.

[0011] Furthermore, the preparation method of the anti-aging curing agent comprises the following steps: SS1: bisphenol A diether dianhydride is placed in N,N-dimethylformamide, vanillyl alcohol and p-toluenesulfonic acid are added, the temperature is raised to react, and the product is collected after reduced pressure distillation to obtain vanillyl alcohol-modified bisphenol A diether dianhydride; SS2: Vanillyl alcohol-modified bisphenol A diether dianhydride is placed in acetone, 2-aminoethanethiol is added, nitrogen is introduced, a composite catalyst is added, and the mixture is stirred for 10-12 hours. After the mixture is stirred, vacuum distillation is performed and the product is collected to obtain an anti-aging curing agent.

[0012] In this solution, the anhydride group in the bisphenol A diether dianhydride structure reacts with the active hydroxyl group in the vanillin structure under the action of p-toluenesulfonic acid to obtain vanillin-modified bisphenol A diether dianhydride. Then, under the action of a composite catalyst, the carboxyl group in the vanillin-modified bisphenol A diether dianhydride structure reacts with the amino group in the 2-aminoethanethiol structure to obtain an anti-aging curing agent. This anti-aging curing agent is terminated with a thiol group and can undergo a rapid cross-linking reaction with the epoxy group in the epoxy resin structure to form a three-dimensional network structure. It can be used as a curing agent for epoxy resin. At the same time, its structure contains vanillin. The phenolic hydroxyl and methoxy groups in its structure have excellent free radical capture capabilities, which can effectively inhibit the oxidation chain reaction during the use of the coating. In addition, during long-term use, the anti-aging small molecules are not easily migrated, which can improve the aging resistance and timeliness of the epoxy resin coating and significantly extend its service life.

[0013] Furthermore, in step SS1, the temperature of the temperature-raising reaction is 80-85° C., and the time is 3-5 hours.

[0014] Furthermore, in step SS2, the composite catalyst is dicyclohexylcarbodiimide and 4-dimethylaminopyridine in a mass ratio of 0.65-1:0.23-0.5.

[0015] A method for preparing an epoxy resin anticorrosive coating comprises the following steps: Step 1: Mix epoxy resin, anticorrosive mica powder, leveling agent, antioxidant, ultraviolet absorber, and acetone, and stir thoroughly at a speed of 150-200 r / min for 1-1.5 hours to obtain component A; Step 2: Mix the anti-aging curing agent, acetone and dimethyl silicone oil defoaming agent, and stir at a speed of 150-200 r / min for 0.5-1 h to obtain component B.

[0016] Beneficial effects of the present invention: The present invention prepares anti-corrosion mica powder and an anti-aging curing agent and participates in the preparation process of the epoxy resin anti-corrosion coating, so that the prepared epoxy resin anti-corrosion coating can effectively block the penetration of corrosive media, while reducing the surface energy of the coating and improving the corrosion resistance of the coating. In addition, the anti-aging small molecule substance vanillin alcohol is added to the anti-aging curing agent in a chemically bonded manner, so that the prepared epoxy resin anti-corrosion coating can have an excellent anti-aging effect and effectively extend its service life.

[0017] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 This is a flow chart for preparing the epoxy resin anti-corrosion coating of the present invention. DETAILED DESCRIPTION

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0021] The preparation methods of the anti-corrosion mica powder and the anti-aging curing agent in the following examples and comparative examples of the present invention are as follows: 1. Preparation of anti-corrosion mica powder S1: 3 g of dimethylvinylchlorosilane, 2.6 g of allyl furoate, and 2.2 g of trifluoroethyl methacrylate were placed in 100 ml of anhydrous ethanol, mixed evenly, and then 0.8 g of benzoyl peroxide was added. The mixture was heated to 60°C and reacted for 5 h. The product was collected after vacuum distillation to obtain an anticorrosive composite. S2: After drying 3.6 g of mica powder at 200°C for 1 h, place it in 80 ml of toluene, ultrasonically disperse it for 10 min, then introduce nitrogen, add 4.3 g of anti-corrosion compound and 0.02 g of triethylamine, heat and reflux for 8 h, then centrifuge and wash and dry to obtain anti-corrosion mica powder.

[0022] 2. Preparation of anti-aging curing agent SS1: Dissolve 3.2 g of bisphenol A diether dianhydride in 80 ml of N,N-dimethylformamide, add 3 g of vanillyl alcohol and 0.03 g of p-toluenesulfonic acid, heat to 80°C and react for 3 h. Collect the product after vacuum distillation to obtain vanillyl alcohol-modified bisphenol A diether dianhydride. SS2: Place 3.8 g of vanillyl alcohol-modified bisphenol A diether dianhydride in 100 ml of acetone, add 3.6 g of 2-aminoethanethiol, pass nitrogen, add 0.65 g of dicyclohexylcarbodiimide and 0.23 g of 4-dimethylaminopyridine, stir thoroughly for 10 hours, and then perform vacuum distillation to collect the product to obtain an anti-aging curing agent.

[0023] Example 1

[0024] An epoxy resin anticorrosive coating, consisting of component A and component B, wherein component A comprises the following raw materials in parts by weight: 60 parts of bisphenol A epoxy resin, 8 parts of anticorrosive mica powder, 1 part of polyurethane leveling agent, 2 parts of antioxidant 1010, 1 part of ultraviolet absorber UV-120, and 130 parts of acetone; and component B comprises the following raw materials in parts by weight: 10 parts of anti-aging curing agent, 50 parts of acetone, and 1 part of dimethyl silicone oil defoaming agent. The preparation method of the epoxy resin anti-corrosion coating comprises the following steps: Step 1: Mix parts by weight of bisphenol A epoxy resin, anticorrosive mica powder, polyurethane leveling agent, antioxidant 1010, ultraviolet absorber UV-120, and acetone, and stir thoroughly at a speed of 150 r / min for 1 hour to obtain component A; Step 2: Mix parts by weight of the anti-aging curing agent, acetone and dimethyl silicone oil defoaming agent, and stir at a speed of 150 r / min for 0.5 h to obtain component B.

[0025] Example 2

[0026] An epoxy resin anticorrosive coating, comprising component A and component B, wherein component A comprises the following raw materials in parts by weight: 70 parts of bisphenol A epoxy resin, 9 parts of anticorrosive mica powder, 1.5 parts of polyurethane leveling agent, 2.5 parts of antioxidant 168, 2 parts of ultraviolet absorber UV-1164, and 140 parts of acetone; and component B comprises the following raw materials in parts by weight: 13 parts of an anti-aging curing agent, 55 parts of acetone, and 1.5 parts of a dimethyl silicone oil defoaming agent. The preparation method of the epoxy resin anti-corrosion coating comprises the following steps: Step 1: Mix parts by weight of bisphenol A epoxy resin, anticorrosive mica powder, polyurethane leveling agent, antioxidant 168, ultraviolet absorber UV-1164, and acetone, and stir them at a speed of 170 r / min for 1.2 hours to obtain component A; Step 2: Mix parts by weight of the anti-aging curing agent, acetone and dimethyl silicone oil defoaming agent, and stir at a speed of 170 r / min for 0.8 h to obtain component B.

[0027] Example 3

[0028] An epoxy resin anticorrosive coating, consisting of component A and component B, wherein component A comprises the following raw materials in parts by weight: 80 parts of bisphenol A epoxy resin, 10 parts of anticorrosive mica powder, 2 parts of water-based organosilicon leveling agent, 3 parts of antioxidant 3114, 3 parts of ultraviolet absorber UV-120, and 150 parts of acetone; and component B comprises the following raw materials in parts by weight: 15 parts of an anti-aging curing agent, 60 parts of acetone, and 2 parts of a dimethyl silicone oil defoaming agent. The preparation method of the epoxy resin anti-corrosion coating comprises the following steps: Step 1: Mix parts by weight of bisphenol A epoxy resin, anticorrosive mica powder, water-based silicone leveling agent, antioxidant 3114, ultraviolet absorber UV-120, and acetone, and stir them thoroughly at a speed of 200 r / min for 1.5 hours to obtain component A; Step 2: Mix parts by weight of the anti-aging curing agent, acetone and dimethyl silicone oil defoaming agent, and stir at a speed of 200 r / min for 1 hour to obtain component B.

[0029] Comparative Example 1 An epoxy resin anticorrosive coating, comprising component A and component B, wherein component A comprises the following raw materials in parts by weight: 70 parts of bisphenol A epoxy resin, 1.5 parts of polyurethane leveling agent, 2.5 parts of antioxidant 168, 2 parts of ultraviolet absorber UV-1164, and 140 parts of acetone; and component B comprises the following raw materials in parts by weight: 13 parts of an anti-aging curing agent, 55 parts of acetone, and 1.5 parts of a dimethyl silicone oil defoaming agent. The preparation method of the epoxy resin anti-corrosion coating comprises the following steps: Step 1: Mix parts by weight of bisphenol A epoxy resin, anticorrosive mica powder, polyurethane leveling agent, antioxidant 168, ultraviolet absorber UV-1164, and acetone, and stir them at a speed of 170 r / min for 1.2 hours to obtain component A; Step 2: Mix parts by weight of the anti-aging curing agent, acetone and dimethyl silicone oil defoaming agent, and stir at a speed of 170 r / min for 0.8 h to obtain component B.

[0030] Comparative Example 2 An epoxy resin anticorrosive coating, consisting of component A and component B, wherein component A comprises the following raw materials in parts by weight: 70 parts of bisphenol A epoxy resin, 9 parts of anticorrosive mica powder, 1.5 parts of polyurethane leveling agent, 2.5 parts of antioxidant 168, 2 parts of ultraviolet absorber UV-1164, and 140 parts of acetone; and component B comprises the following raw materials in parts by weight: 13 parts of bisphenol A diether dianhydride, 55 parts of acetone, and 1.5 parts of dimethyl silicone oil defoamer. The preparation method of the epoxy resin anti-corrosion coating comprises the following steps: Step 1: Mix parts by weight of bisphenol A epoxy resin, anticorrosive mica powder, polyurethane leveling agent, antioxidant 168, ultraviolet absorber UV-1164, and acetone, and stir them at a speed of 170 r / min for 1.2 hours to obtain component A; Step 2: Mix parts by weight of the anti-aging curing agent, acetone and dimethyl silicone oil defoaming agent, and stir at a speed of 170 r / min for 0.8 h to obtain component B.

[0031] Comparative Example 3 An epoxy resin anticorrosive coating, comprising component A and component B, wherein component A comprises the following raw materials in parts by weight: 70 parts of bisphenol A epoxy resin, 9 parts of mica powder, 1.5 parts of polyurethane leveling agent, 2.5 parts of antioxidant 168, 2 parts of ultraviolet absorber UV-1164, and 140 parts of acetone; and component B comprises the following raw materials in parts by weight: 13 parts of an anti-aging curing agent, 55 parts of acetone, and 1.5 parts of a dimethyl silicone oil defoaming agent. The preparation method of the epoxy resin anti-corrosion coating comprises the following steps: Step 1: Mix parts by weight of bisphenol A epoxy resin, anticorrosive mica powder, polyurethane leveling agent, antioxidant 168, ultraviolet absorber UV-1164, and acetone, and stir them at a speed of 170 r / min for 1.2 hours to obtain component A; Step 2: Mix parts by weight of the anti-aging curing agent, acetone and dimethyl silicone oil defoaming agent, and stir at a speed of 170 r / min for 0.8 h to obtain component B.

[0032] Performance testing The epoxy resin anti-corrosion coating component A and component B prepared in Examples 1 to 3 and Comparative Examples 1 to 3 were mixed, coated on a steel plate that met the specifications, and cured at 100°C for 20 minutes as samples. The samples were subjected to a tensile strength test according to the reference standard GB / T1040-2006 and the samples after being treated in an aging box at 80°C for 72 hours to determine the anti-aging ability of the samples. The samples were subjected to a salt spray test according to the reference standard GB / T1771-2007 to determine the corrosion resistance of the samples.

[0033] The samples prepared in Examples 1 to 3 all have excellent anti-aging and corrosion resistance. In the sample prepared in Comparative Example 1, no anti-corrosion mica powder was added, and the anti-corrosion ability was poor. In the sample prepared in Comparative Example 2, bisphenol A diether dianhydride was used as a curing agent, and the anti-aging ability was poor. In the sample prepared in Comparative Example 3, mica powder was directly added without being coated, and the anti-corrosion performance was poor.

[0034] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0035] The above content is merely an example and explanation of the concept of the present invention. Those skilled in the art may make various modifications or additions to the described specific embodiments or replace them in a similar manner. As long as they do not deviate from the scope defined by the concept of the invention, they should all fall within the scope of protection of the present invention.

Claims

1. An epoxy resin anticorrosive coating, characterized in that: The invention consists of two parts: component A and component B; the component A comprises the following raw materials in parts by weight: 60-80 parts of epoxy resin, 8-10 parts of anti-corrosion mica powder, 1-2 parts of leveling agent, 2-3 parts of antioxidant, 1-3 parts of ultraviolet absorber, and 130-150 parts of acetone; the component B comprises the following raw materials in parts by weight: 10-15 parts of anti-aging curing agent, 50-60 parts of acetone, and 1-2 parts of defoaming agent.

2. The epoxy resin anticorrosive coating according to claim 1, characterized in that: The epoxy resin is bisphenol A epoxy resin; the leveling agent is any one of a polyurethane leveling agent and a water-based silicone leveling agent; the antioxidant is any one of antioxidant 1010, antioxidant 168, and antioxidant 3114; the ultraviolet absorber is any one of ultraviolet absorber UV-120 and ultraviolet absorber UV-1164; and the defoaming agent is a dimethyl silicone oil defoaming agent.

3. The epoxy resin anticorrosive coating according to claim 1, characterized in that: The preparation method of the anticorrosive mica powder comprises the following steps: S1: Dimethylvinylchlorosilane, allyl furoate, and trifluoroethyl methacrylate are placed in anhydrous ethanol, mixed evenly, and then an initiator is added. The mixture is heated to 60-65°C and reacted for 5-6 hours. The product is collected after vacuum distillation to obtain an anti-corrosion composite. S2: After drying the mica powder at 200-220° C. for 1-1.5 hours, place it in toluene, ultrasonically disperse it for 10-15 minutes, introduce nitrogen, add the anti-corrosion compound and triethylamine, heat the mixture under reflux, and then centrifuge to obtain the anti-corrosion mica powder after washing and drying.

4. The epoxy resin anticorrosive coating according to claim 3, characterized in that: In step S1, the initiator is any one of benzoyl peroxide, dicumyl peroxide, and azobisisobutyronitrile.

5. The epoxy resin anticorrosive coating according to claim 3, characterized in that: In step S2, the temperature rising and reflux reaction time is 8-12 hours.

6. The epoxy resin anticorrosive coating according to claim 1, characterized in that: The preparation method of the anti-aging curing agent comprises the following steps: SS1: bisphenol A diether dianhydride is placed in N,N-dimethylformamide, vanillyl alcohol and p-toluenesulfonic acid are added, the temperature is raised to react, and the product is collected after reduced pressure distillation to obtain vanillyl alcohol-modified bisphenol A diether dianhydride; SS2: Vanillyl alcohol-modified bisphenol A diether dianhydride is placed in acetone, 2-aminoethanethiol is added, nitrogen is introduced, a composite catalyst is added, and the mixture is stirred for 10-12 hours. After the mixture is stirred, vacuum distillation is performed and the product is collected to obtain an anti-aging curing agent.

7. The epoxy resin anticorrosive coating according to claim 6, characterized in that: In step SS1, the temperature of the temperature-raising reaction is 80-85° C., and the time is 3-5 hours.

8. The epoxy resin anticorrosive coating according to claim 6, characterized in that: In step SS2, the composite catalyst is dicyclohexylcarbodiimide and 4-dimethylaminopyridine in a mass ratio of 0.65-1:0.23-0.

5.

9. A method for preparing the epoxy resin anticorrosive coating according to claim 1, characterized in that: The following steps are involved: Step 1: Mix epoxy resin, anticorrosive mica powder, leveling agent, antioxidant, ultraviolet absorber, and acetone, and stir thoroughly at a speed of 150-200 r / min for 1-1.5 hours to obtain component A; Step 2: Mix the anti-aging curing agent, acetone and dimethyl silicone oil defoaming agent, and stir at a speed of 150-200 r / min for 0.5-1 h to obtain component B.

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