Epoxy anticorrosive paint and method for preparing the same

Abstract

The application relates to the technical field of paint, and discloses an epoxy resin anticorrosive paint and a preparation method thereof. The epoxy resin anticorrosive paint is composed of two parts of component A and component B. The component A comprises the following raw materials: epoxy resin, anticorrosive mica powder, a leveling agent, an antioxidant, an ultraviolet absorber and acetone. The component B comprises the following raw materials: an anti-aging curing agent, acetone, dimethyl silicone oil defoaming agent. The anticorrosive mica powder and the anti-aging curing agent are involved in the preparation process of the epoxy resin paint, so that the prepared epoxy resin paint can effectively block the penetration of corrosion medium, reduce the surface energy of the coating, improve the corrosion resistance of the coating, and the anti-aging small-molecule vanillin is added into the anti-aging curing agent in a chemical bonding mode, so that the prepared epoxy resin paint can have excellent anti-aging effect and effectively prolong the service life.

Description

Technical Field

[0001] This invention relates to the field of coating technology, specifically to an epoxy resin anti-corrosion coating and its preparation method. Background Technology

[0002] Epoxy resin coatings are protective coatings with excellent mechanical strength and adhesion, playing a crucial role in shipbuilding, oil pipelines, bridge steel structures, and other engineering projects. These coatings form a three-dimensional network structure through cross-linking and curing, effectively blocking the penetration of water vapor and corrosive media, providing protection for the substrate. However, with the increasingly harsh operating environments of industrial equipment, the limitations of traditional epoxy resin coatings are becoming increasingly apparent. Especially in high salt spray environments, epoxy resin coatings not only have to withstand the electrochemical corrosion of chloride ions, but also need to resist the molecular chain degradation caused by the expansion stress induced by humid heat cycling. The superposition of multiple destructive factors leads to a significant reduction in the service life of epoxy resin coatings.

[0003] Patent CN101260273B discloses a flexible epoxy anti-corrosion coating. This epoxy anti-corrosion coating comprises the following raw materials: polyether-type polyurethane epoxy resin, rust-inhibiting pigments and fillers, modified curing agents, additives, and diluents. The epoxy anti-corrosion coating prepared by the above components not only maintains the good adhesion and anti-corrosion ability of epoxy anti-corrosion coatings, but also improves the toughness of epoxy anti-corrosion coatings. In particular, the toughness of the coating after being soaked in seawater is greatly improved compared with conventional epoxy coatings. However, this patent does not improve the aging resistance of epoxy anti-corrosion coatings, and the service life of this epoxy anti-corrosion coating in humid and hot environments needs to be improved. Summary of the Invention

[0004] The purpose of this invention is to provide an epoxy resin anti-corrosion coating and its preparation method, which solves the problems of weak anti-corrosion ability and easy aging of ordinary epoxy resin coatings, thus affecting their service life.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] An epoxy resin anti-corrosion coating comprises two parts: component A and component B. Component A includes the following raw materials in parts by weight: 60-80 parts epoxy resin, 8-10 parts anti-corrosion mica powder, 1-2 parts leveling agent, 2-3 parts antioxidant, 1-3 parts ultraviolet absorber, and 130-150 parts acetone. Component B includes the following raw materials in parts by weight: 10-15 parts anti-aging curing agent, 50-60 parts acetone, and 1-2 parts defoamer.

[0007] Further, the epoxy resin is a bisphenol A type epoxy resin; the leveling agent is any one of a polyurethane leveling agent or a water-based silicone leveling agent; the antioxidant is any one of antioxidant 1010, antioxidant 168, or antioxidant 3114; the ultraviolet absorber is any one of ultraviolet absorber UV-120 or ultraviolet absorber UV-1164; and the defoamer is a dimethyl silicone oil defoamer.

[0008] Furthermore, the preparation method of the anti-corrosion mica powder includes the following steps:

[0009] 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℃ and reacted for 5-6 hours. The product is collected by vacuum distillation to obtain the preservative complex.

[0010] S2: After drying mica powder at 200-220℃ for 1-1.5h, place it in toluene, ultrasonically disperse it for 10-15min, then introduce nitrogen gas, add the preservative complex and triethylamine, heat and reflux the reaction, centrifuge and separate, and obtain preservative mica powder after washing and drying.

[0011] 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 mica powder react with the silanol groups in the structure of the anti-corrosion composite to obtain anti-corrosion mica powder. This anti-corrosion mica powder, with mica powder as the core, can block the penetration of corrosive media through its unique lamellar structure. The composite medium containing organosilicon, organofluorine, and furoyl groups is chemically bonded to the surface of the lamellar mica powder to form a dense chemical protective layer. Organosilicon can enhance the hydrophobicity of the coating, organofluorine can reduce the surface energy, and furoyl groups have chemical stability. Through the organic-inorganic hybridization, multiple anti-corrosion mechanisms are synergistically achieved, making the prepared epoxy resin coating have extremely strong anti-corrosion performance.

[0012] Further, in step S1, the initiator is any one of benzoyl peroxide, dicumyl peroxide, and azobisisobutyronitrile.

[0013] Furthermore, in step S2, the heating and reflux reaction time is 8-12 hours.

[0014] Furthermore, the preparation method of the anti-aging curing agent includes the following steps:

[0015] SS1: Bisphenol A type diether dianhydride was placed in N,N-dimethylformamide, vanillin and p-toluenesulfonic acid were added, the mixture was heated and reacted, and the product was collected by vacuum distillation to obtain vanillin-modified bisphenol A type diether dianhydride.

[0016] SS2: Vanillin-modified bisphenol A diether dianhydride was placed in acetone, 2-aminoethanethiol was added, nitrogen gas was introduced, a composite catalyst was added, and the mixture was stirred thoroughly for 10-12 hours. After the reaction was completed, the product was collected by vacuum distillation to obtain the anti-aging curing agent.

[0017] In this scheme, under the action of p-toluenesulfonic acid, the anhydride group in the bisphenol A type diether dianhydride structure reacts with the active hydroxyl group in the vanillin structure to obtain vanillin-modified bisphenol A type diether dianhydride. Then, under the action of a composite catalyst, the carboxyl group in the vanillin-modified bisphenol A type diether dianhydride structure and the amino group in the 2-aminoethanethiol structure react to obtain an anti-aging curing agent. This anti-aging curing agent is end-capped with mercapto groups, which can undergo rapid cross-linking reaction with the epoxy groups 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, and the phenolic hydroxyl and methoxy groups in its structure have excellent free radical scavenging ability. During the use of the coating, it can effectively inhibit the oxidation chain reaction. Moreover, during long-term use, the anti-aging small molecules are not easy to migrate, which can improve the aging resistance and aging time of epoxy resin coatings and significantly extend their service life.

[0018] Furthermore, in step SS1, the temperature of the heating reaction is 80-85℃, and the time is 3-5h.

[0019] Further, in step SS2, the composite catalyst is a mixture of dicyclohexylcarbodiimide and 4-dimethylaminopyridine in a mass ratio of 0.65-1:0.23-0.5.

[0020] A method for preparing an epoxy resin anti-corrosion coating includes the following steps:

[0021] Step 1: Mix epoxy resin, anti-corrosion mica powder, leveling agent, antioxidant, ultraviolet absorber, and acetone, and stir thoroughly at 150-200 r / min for 1-1.5 h to obtain component A.

[0022] Step 2: Mix the anti-aging curing agent, acetone and dimethyl silicone defoamer, and stir at 150-200 r / min for 0.5-1 h to obtain component B.

[0023] The beneficial effects of this invention are:

[0024] This invention incorporates anti-corrosion mica powder and an anti-aging curing agent into the preparation process of epoxy resin anti-corrosion coatings. This allows the prepared epoxy resin anti-corrosion coating to effectively block the penetration of corrosive media, reduce the surface energy of the coating, and improve the corrosion resistance of the coating. Furthermore, the anti-aging small molecule substance vanillin is chemically bonded to the anti-aging curing agent, giving the prepared epoxy resin anti-corrosion coating excellent anti-aging effects and effectively extending its service life.

[0025] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a flowchart illustrating the preparation process of the epoxy resin anti-corrosion coating of the present invention. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] The preparation methods of the anti-corrosion mica powder and anti-aging curing agent in the following embodiments and comparative examples of the present invention are as follows:

[0030] I. Preparation of Anti-corrosion Mica Powder

[0031] S1: 3g of dimethylvinylchlorosilane, 2.6g of allyl furoate and 2.2g of trifluoroethyl methacrylate were placed in 100ml of anhydrous ethanol, mixed evenly, and then 0.8g of benzoyl peroxide was added. The mixture was heated to 60℃ and reacted for 5h. The product was collected by vacuum distillation to obtain the preservative complex.

[0032] S2: After drying 3.6g of mica powder at 200℃ for 1h, it was placed in 80ml of toluene, ultrasonically dispersed for 10min, nitrogen gas was introduced, 4.3g of preservative complex and 0.02g of triethylamine were added, the mixture was heated to reflux and reacted for 8h, then centrifuged, washed and dried to obtain preservative mica powder.

[0033] II. Preparation of Anti-aging Curing Agent

[0034] SS1: 3.2g of bisphenol A type diether dianhydride was placed in 80ml of N,N-dimethylformamide, 3g of vanillin alcohol and 0.03g of p-toluenesulfonic acid were added, the mixture was heated to 80℃ and reacted for 3h, and the product was collected by vacuum distillation to obtain vanillin alcohol modified bisphenol A type diether dianhydride.

[0035] SS2: Place 3.8g of vanillin-modified bisphenol A diether dianhydride in 100ml of acetone, add 3.6g of 2-aminoethanethiol, purge with nitrogen, add 0.65g of dicyclohexylcarbodiimide and 0.23g of 4-dimethylaminopyridine, stir thoroughly for 10h, and then distill under reduced pressure to collect the product to obtain the anti-aging curing agent.

[0036] Example 1

[0037] An epoxy resin anti-corrosion coating comprises two parts: component A and component B. Component A includes the following raw materials in parts by weight: 60 parts bisphenol A type epoxy resin, 8 parts anti-corrosion mica powder, 1 part polyurethane leveling agent, 2 parts antioxidant 1010, 1 part ultraviolet absorber UV-120, and 130 parts acetone. Component B includes the following raw materials in parts by weight: 10 parts anti-aging curing agent, 50 parts acetone, and 1 part dimethyl silicone defoamer.

[0038] The preparation method of this epoxy resin anti-corrosion coating includes the following steps:

[0039] Step 1: Mix the following components by weight: bisphenol A epoxy resin, anti-corrosion mica powder, polyurethane leveling agent, antioxidant 1010, ultraviolet absorber UV-120, and acetone. Stir thoroughly at 150 r / min for 1 hour to obtain component A.

[0040] Step 2: Mix the anti-aging curing agent, acetone and dimethyl silicone defoamer by weight, and stir at 150 r / min for 0.5 h to obtain component B.

[0041] Example 2

[0042] An epoxy resin anti-corrosion coating comprises two parts: component A and component B. Component A includes the following raw materials in parts by weight: 70 parts bisphenol A type epoxy resin, 9 parts anti-corrosion mica powder, 1.5 parts polyurethane leveling agent, 2.5 parts antioxidant 168, 2 parts ultraviolet absorber UV-1164, and 140 parts acetone. Component B includes the following raw materials in parts by weight: 13 parts anti-aging curing agent, 55 parts acetone, and 1.5 parts dimethyl silicone oil defoamer.

[0043] The preparation method of this epoxy resin anti-corrosion coating includes the following steps:

[0044] Step 1: Mix the following components by weight: bisphenol A epoxy resin, anti-corrosion mica powder, polyurethane leveling agent, antioxidant 168, ultraviolet absorber UV-1164, and acetone. Stir thoroughly at 170 r / min for 1.2 h to obtain component A.

[0045] Step 2: Mix the anti-aging curing agent, acetone and dimethyl silicone defoamer by weight, and stir at 170 r / min for 0.8 h to obtain component B.

[0046] Example 3

[0047] An epoxy resin anti-corrosion coating comprises two parts: component A and component B. Component A includes the following raw materials in parts by weight: 80 parts bisphenol A type epoxy resin, 10 parts anti-corrosion mica powder, 2 parts water-based organosilicon leveling agent, 3 parts antioxidant 3114, 3 parts ultraviolet absorber UV-120, and 150 parts acetone. Component B includes the following raw materials in parts by weight: 15 parts anti-aging curing agent, 60 parts acetone, and 2 parts dimethyl silicone defoamer.

[0048] The preparation method of this epoxy resin anti-corrosion coating includes the following steps:

[0049] Step 1: Mix the following components by weight: bisphenol A epoxy resin, anti-corrosion mica powder, water-based silicone leveling agent, antioxidant 3114, ultraviolet absorber UV-120, and acetone. Stir thoroughly at 200 r / min for 1.5 h to obtain component A.

[0050] Step 2: Mix the anti-aging curing agent, acetone and dimethyl silicone defoamer by weight, and stir at 200 r / min for 1 hour to obtain component B.

[0051] Comparative Example 1

[0052] An epoxy resin anti-corrosion coating comprises two parts: component A and component B. Component A includes the following raw materials in parts by weight: 70 parts bisphenol A type epoxy resin, 1.5 parts polyurethane leveling agent, 2.5 parts antioxidant 168, 2 parts ultraviolet absorber UV-1164, and 140 parts acetone. Component B includes the following raw materials in parts by weight: 13 parts anti-aging curing agent, 55 parts acetone, and 1.5 parts dimethyl silicone defoamer.

[0053] The preparation method of this epoxy resin anti-corrosion coating includes the following steps:

[0054] Step 1: Mix the following components by weight: bisphenol A epoxy resin, anti-corrosion mica powder, polyurethane leveling agent, antioxidant 168, ultraviolet absorber UV-1164, and acetone. Stir thoroughly at 170 r / min for 1.2 h to obtain component A.

[0055] Step 2: Mix the anti-aging curing agent, acetone and dimethyl silicone defoamer by weight, and stir at 170 r / min for 0.8 h to obtain component B.

[0056] Comparative Example 2

[0057] An epoxy resin anti-corrosion coating comprises two parts: component A and component B. Component A includes the following raw materials in parts by weight: 70 parts bisphenol A type epoxy resin, 9 parts anti-corrosion mica powder, 1.5 parts polyurethane leveling agent, 2.5 parts antioxidant 168, 2 parts ultraviolet absorber UV-1164, and 140 parts acetone. Component B includes the following raw materials in parts by weight: 13 parts bisphenol A type diether dianhydride, 55 parts acetone, and 1.5 parts dimethyl silicone oil defoamer.

[0058] The preparation method of this epoxy resin anti-corrosion coating includes the following steps:

[0059] Step 1: Mix the following components by weight: bisphenol A epoxy resin, anti-corrosion mica powder, polyurethane leveling agent, antioxidant 168, ultraviolet absorber UV-1164, and acetone. Stir thoroughly at 170 r / min for 1.2 h to obtain component A.

[0060] Step 2: Mix the anti-aging curing agent, acetone and dimethyl silicone defoamer by weight, and stir at 170 r / min for 0.8 h to obtain component B.

[0061] Comparative Example 3

[0062] An epoxy resin anti-corrosion coating comprises two parts: component A and component B. Component A includes the following raw materials in parts by weight: 70 parts bisphenol A epoxy resin, 9 parts mica powder, 1.5 parts polyurethane leveling agent, 2.5 parts antioxidant 168, 2 parts ultraviolet absorber UV-1164, and 140 parts acetone. Component B includes the following raw materials in parts by weight: 13 parts anti-aging curing agent, 55 parts acetone, and 1.5 parts dimethyl silicone defoamer.

[0063] The preparation method of this epoxy resin anti-corrosion coating includes the following steps:

[0064] Step 1: Mix the following components by weight: bisphenol A epoxy resin, anti-corrosion mica powder, polyurethane leveling agent, antioxidant 168, ultraviolet absorber UV-1164, and acetone. Stir thoroughly at 170 r / min for 1.2 h to obtain component A.

[0065] Step 2: Mix the anti-aging curing agent, acetone and dimethyl silicone defoamer by weight, and stir at 170 r / min for 0.8 h to obtain component B.

[0066] Performance testing

[0067] The epoxy resin anti-corrosion coatings prepared in Examples 1-3 and Comparative Examples 1-3 were mixed with component B and applied to steel plates that met the specifications. After curing at 100°C for 20 minutes, the samples were used as samples. Tensile strength tests were performed on the samples and the samples treated in an aging chamber at 80°C for 72 hours, in accordance with standard GB / T1040-2006, to determine the anti-aging ability of the samples. Salt spray tests were performed on the samples in accordance with standard GB / T1771-2007 to determine the corrosion resistance of the samples.

[0068] The samples prepared in Examples 1-3 all exhibited excellent anti-aging and corrosion resistance. The sample prepared in Comparative Example 1 did not contain any anti-corrosion mica powder, resulting in poor corrosion resistance. The sample prepared in Comparative Example 2 used bisphenol A diether dianhydride as a curing agent, resulting in poor anti-aging ability. The sample prepared in Comparative Example 3 directly added mica powder without coating treatment, resulting in poor corrosion resistance.

[0069] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0070] The above content is merely an example and illustration of the concept of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described or use similar methods to replace them, as long as they do not deviate from the scope defined by the inventive concept, they should all fall within the protection scope of the present invention.

Claims

1. An epoxy resin anti-corrosion coating, characterized in that, It consists of two parts: Component A and Component B. Component A includes the following raw materials in parts by weight: 60-80 parts epoxy resin, 8-10 parts anti-corrosion mica powder, 1-2 parts leveling agent, 2-3 parts antioxidant, 1-3 parts ultraviolet absorber, and 130-150 parts acetone. Component B includes the following raw materials in parts by weight: 10-15 parts anti-aging curing agent, 50-60 parts acetone, and 1-2 parts defoamer. The preparation method of the anti-corrosion mica powder includes 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℃ and reacted for 5-6 hours. The product is collected by vacuum distillation to obtain the preservative complex. S2: After drying mica powder at 200-220℃ for 1-1.5h, place it in toluene, ultrasonically disperse it for 10-15min, then introduce nitrogen gas, add the preservative complex and triethylamine, heat and reflux the reaction, centrifuge and separate, and obtain preservative mica powder after washing and drying. The preparation method of the anti-aging curing agent includes the following steps: SS1: Bisphenol A type diether dianhydride was placed in N,N-dimethylformamide, vanillin and p-toluenesulfonic acid were added, the mixture was heated and reacted, and the product was collected by vacuum distillation to obtain vanillin-modified bisphenol A type diether dianhydride. SS2: Vanillin-modified bisphenol A diether dianhydride was placed in acetone, 2-aminoethanethiol was added, nitrogen gas was introduced, a composite catalyst was added, and the mixture was stirred thoroughly for 10-12 hours. After the reaction was completed, the product was collected by vacuum distillation to obtain the anti-aging curing agent.

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

3. The epoxy resin anti-corrosion coating according to claim 1, characterized in that, In step S1, the initiator is any one of benzoyl peroxide, dicumyl peroxide, and azobisisobutyronitrile.

4. The epoxy resin anti-corrosion coating according to claim 1, characterized in that, In step S2, the heating and reflux reaction time is 8-12 hours.

5. The epoxy resin anti-corrosion coating according to claim 1, characterized in that, In step SS1, the temperature of the heating reaction is 80-85℃, and the time is 3-5h.

6. The epoxy resin anti-corrosion coating according to claim 5, 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.

7. A method for preparing an epoxy resin anti-corrosion coating as described in claim 1, characterized in that, Includes the following steps: Step 1: Mix epoxy resin, anti-corrosion mica powder, leveling agent, antioxidant, ultraviolet absorber, and acetone, and stir thoroughly at 150-200 r / min for 1-1.5 h to obtain component A. Step 2: Mix the anti-aging curing agent, acetone and dimethyl silicone defoamer, and stir at 150-200 r / min for 0.5-1 h to obtain component B.

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