Water-avoiding anchoring anticorrosive paint as well as preparation method and application thereof

Abstract

The invention relates to the technical field of coatings, and provides a water-avoiding anchoring anticorrosive coating as well as a preparation method and application thereof. The invention relates to a water-avoiding anchoring anticorrosive paint, which is composed of a component A and a component B. The component A comprises the following raw materials by weight: epoxy resin, a pigment, an anticorrosive material, a filler, a solvent A and an auxiliary agent A. The component B comprises the following raw materials by weight: a curing agent, an auxiliary agent B and a solvent B. The epoxy resin is composed of first epoxy resin and second epoxy resin, and the epoxy equivalent and viscosity of the first epoxy resin are both smaller than those of the second epoxy resin. Through the technical scheme, the problem of insufficient corrosion resistance of a water-avoiding anchoring coating in related technologies is solved, and the prepared corrosion-resistant coating has the characteristics of being capable of being constructed in environments such as high humidity, a slight water-containing base material and a dry-wet alternating area, excellent in corrosion resistance and the like.

Description

Technical Field

[0001] This invention relates to the field of coating technology, specifically to a water-repellent anchoring anti-corrosion coating, its preparation method, and its application. Background Technology

[0002] In the construction and operation and maintenance of infrastructure such as buildings, bridges, tunnels, and marine engineering, the stability and durability of coatings directly determine the safety level and service life of the entire project. Moisture erosion and environmental corrosion are the two core causes of coating protection failure. Against this backdrop, water-repellent anchoring coatings, as a type of functional coating designed for construction in harsh environments, have emerged. Their core definition is a coating product that combines the dual functions of anchoring reinforcement at water-containing interfaces with corrosion protection and waterproofing. By forming a continuous and dense coating on the substrate surface, it can penetrate into the pores of the substrate surface and the gaps at the anchoring interface, enhancing the interfacial bonding strength of the anchoring system through physical interlocking and chemical bonding, ensuring the stability of force transmission between the anchoring coating and the substrate. Simultaneously, it can construct an effective moisture barrier, preventing liquid water and humid media from intruding into the anchoring interface and avoiding interface delamination problems caused by moisture.

[0003] In terms of application scenarios, water-repellent and anchoring coatings are widely used on substrates such as concrete and steel structures, including bridges, tunnels, and offshore platforms. In these scenarios, the water-repellent and anchoring properties of the coatings can effectively solve the problem of decreased adhesion at the interface caused by moisture intrusion, making it one of the key materials for ensuring the long-term stable operation of the coating system.

[0004] Existing anti-corrosion coatings still exhibit insufficient anti-corrosion performance after application in environments with high humidity, slightly moist substrates, or alternating wet and dry conditions. This deficiency can lead to a series of serious hazards in complex service environments. When timely application is required in high humidity environments, slightly moist substrates, or alternating wet and dry environments, water-repellent anchoring coatings with insufficient anti-corrosion performance struggle to form a stable and dense protective coating. High humidity and residual moisture on the substrate disrupt the interfacial bonding between the coating and the substrate, resulting in increased pinholes and microcracks, failing to effectively prevent the intrusion of corrosive media. Furthermore, the short application time in alternating wet and dry cyclical areas makes it impossible for ordinary coatings to meet the application requirements, compromising coating quality. This directly triggers electrochemical corrosion of the workpiece, causing the formation of loose corrosion products on the workpiece surface, resulting in a rapid decline in coating adhesion and leading to coating loosening. After long-term service, corrosion will continue to erode the workpiece itself, significantly increasing the cost of maintenance and replacement in later stages of the project, resulting in a serious waste of human and material resources.

[0005] Therefore, it is very necessary to develop a water-repellent anchoring coating with good anti-corrosion properties. Summary of the Invention

[0006] This invention proposes a water-repellent anchoring anti-corrosion coating, its preparation method, and its application, which solves the problem of insufficient anti-corrosion performance of water-repellent anchoring coatings in related technologies.

[0007] The technical solution of this invention is as follows: This invention proposes a water-repellent anchoring anti-corrosion coating, which is composed of component A and component B. Component A includes the following raw materials in parts by weight: 25-35 parts epoxy resin, 8-12 parts pigment, 15-20 parts anti-corrosion agent, 40-50 parts filler, 5-12 parts solvent A, and 1-3 parts additive A. Component B includes the following raw materials in parts by weight: 70-80 parts curing agent, 8-12 parts additive B, and 8-22 parts solvent B. The epoxy resin is composed of a first epoxy resin and a second epoxy resin, wherein the epoxy equivalent and viscosity of the first epoxy resin are both lower than those of the second epoxy resin.

[0008] As a further technical solution, the epoxy equivalent of the first epoxy resin is 165~175 g / eq, and the viscosity is 3500~4500 mPa·s, and the epoxy equivalent of the second epoxy resin is 185~200 g / eq, and the viscosity is 10000~15000 mPa·s.

[0009] As a further technical solution, the mass ratio of the first epoxy resin to the second epoxy resin is 7:3~4.

[0010] As a further technical solution, the mass ratio of component A to component B is 100:10~12.5.

[0011] As a further technical solution, the pigment includes one or more of rutile titanium dioxide, carbon black, and iron oxide red, preferably rutile titanium dioxide.

[0012] As a further technical solution, the corrosion-resistant material includes one or more of phosphates, polyphosphates, and metal oxides, wherein the metal oxide includes cerium oxide.

[0013] As a further technical solution, the filler includes one or more of wollastonite powder, talc powder, and precipitated barium sulfate.

[0014] As a further technical solution, solvent A and solvent B each independently include one or more of xylene, n-butanol, butyl acetate, and cyclohexanone, preferably n-butanol.

[0015] As a further technical solution, the additive A includes one or more of leveling agents, defoamers, and dispersants.

[0016] As a further technical solution, the leveling agent includes one or both of BYK-333 and BYK-358N.

[0017] As a further technical solution, the defoamer includes one or both of Defom6800 and KU-P465.

[0018] As a further technical solution, the dispersant includes one or more of EFKA-4080, BYK163, and AFC0NA PF502.

[0019] As a further technical solution, the auxiliary agent B is a quaternary ammonium salt compound with an alkyl chain, and the quaternary ammonium salt compound includes one or both of tallow diamine dioleate and choline.

[0020] As a further technical solution, the auxiliary agent B is composed of tallow diamine dioleate and choline in a mass ratio of 7~8:3.

[0021] In this invention's water-repellent, anchoring, and anti-corrosion coating, component B includes additive B, which is composed of tallow diamine dioleate and choline. The long-chain alkyl groups in the tallow diamine dioleate molecule enhance its compatibility with the organic components in the coating system, while its polar groups can form interactions with the substrate surface. Choline molecules have strong polarity and good hydrophilicity, allowing them to quickly penetrate into the micropores on the substrate surface and construct a stable interfacial bonding layer through hydrogen bonding and other interactions. The combination of these two additives optimizes the wetting and spreading properties of the coating on the substrate surface, reduces interfacial bubbles and defects, and enables the coating to form a continuous and dense coating layer. Furthermore, it strengthens the bonding between the coating and the substrate, significantly improving the adhesion of the coating and effectively preventing problems such as peeling and flaking during long-term use or in harsh environments.

[0022] As a further technical solution, the curing agent includes one or two of phenolic amine and polyamide.

[0023] This invention also proposes a method for preparing a water-repellent anchoring and anti-corrosion coating, which includes the following steps: S1. Mix the raw material of component A evenly, and grind it to obtain mixture A; S2. Mix the raw materials of component B evenly to obtain mixture B; S3. When using, mix the mixture A and the mixture B evenly to obtain the water-repellent anchoring and anti-corrosion coating.

[0024] As a further technical solution, the fineness of the mixture A obtained after grinding is ≤50μm.

[0025] The present invention also proposes the application of the water-repellent anchoring anti-corrosion coating or the water-repellent anchoring anti-corrosion coating preparation method described above in construction in environments such as high humidity, slightly water-containing substrates, and areas with alternating dry and wet conditions.

[0026] The working principle and beneficial effects of this invention are as follows: In the water-repellent anchoring anti-corrosion coating of this invention, the epoxy resin in component A is composed of a first epoxy resin and a second epoxy resin with different epoxy equivalents and viscosities. The first epoxy resin has a lower epoxy equivalent and viscosity, exhibiting good wetting and dispersibility. On the one hand, it can fully integrate with the pigments, anti-corrosion materials, fillers, etc. in component A, ensuring that the anti-corrosion functional components are uniformly dispersed in the coating system and avoiding the formation of weak anti-corrosion areas due to component aggregation. On the other hand, its good permeability allows the coating to penetrate deep into the pores of the substrate surface and the gaps at the anchoring interface, forming a tight physical bond with the substrate and anchoring components during the curing process. The second epoxy resin, with its high epoxy equivalent and high viscosity, provides strong physical protective support for the coating due to its high cross-linking density structure formed after curing. The combined use of the first epoxy resin and the second epoxy resin achieves uniform dispersion of the anti-corrosion functional components through the excellent wettability and dispersibility of the first epoxy resin, forming an anti-corrosion base. At the same time, the high cross-linking density of the second epoxy resin creates a dense anti-corrosion barrier, which helps to form a long-lasting anti-corrosion barrier that combines sealing and barrier properties with structural stability, thereby improving the anti-corrosion performance of the water-repellent anchoring coating. Detailed Implementation

[0027] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. 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 of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0028] Unless otherwise specified, the following embodiments and comparative examples are as follows: Curing agent: NX2003 phenolic amine curing agent; First epoxy resin: epoxy equivalent of 165~175g / eq, viscosity of 3500~4500mPa.S, model EMTE170, purchased from Wuhan Diergu New Materials Co., Ltd. Second epoxy resin: epoxy equivalent is 185~200g / eq, viscosity is 10000~15000mPa.S, type is E51; Talc powder: average particle size is 800 mesh; Rutile titanium dioxide: average particle size is 0.1 μm; Dispersant: Model EFKA-4080; Cerium oxide: average particle size is 800 mesh; Defoamer: Model number Defom6800.

[0029] Example 1 A water-repellent, anchoring, and anti-corrosion coating, comprising component A, which includes the following raw materials by weight: 25 parts epoxy resin, 8 parts rutile titanium dioxide, 15 parts cerium oxide, 40 parts talc, 5 parts n-butanol, and 1 part additive A, wherein additive A is composed of leveling agents BYK-333, Defom6800, and EFKA-4080 in a mass ratio of 1:1:1; and component B, which includes the following raw materials by weight: 70 parts curing agent, 8 parts additive B, and 8 parts n-butanol, wherein additive B is tallow diamine dioleate, and the epoxy resin is composed of a first epoxy resin and a second epoxy resin in a mass ratio of 7:3. The mass ratio of component A to component B is 10:1; A method for preparing a water-repellent, anchoring, and anti-corrosion coating includes the following steps: S1. Mix the raw materials of component A evenly, and grind them with a grinder to a fineness of ≤50μm to obtain mixture A; S2. Mix the raw materials of component B evenly to obtain mixture B; S3. When using, mix mixture A and mixture B evenly to obtain a water-repellent anchoring and anti-corrosion coating.

[0030] Example 2 A water-repellent, anchoring, and anti-corrosion coating, comprising component A, which includes the following raw materials by weight: 30 parts epoxy resin, 10 parts rutile titanium dioxide, 18 parts cerium oxide, 45 parts talc, 9 parts n-butanol, and 2 parts additive A, wherein additive A is composed of leveling agents BYK-333, Defom6800, and EFKA-4080 in a mass ratio of 1:1:1; and component B, which includes the following raw materials by weight: 75 parts curing agent, 10 parts additive B, and 15 parts n-butanol, wherein additive B is tallow diamine dioleate, and the epoxy resin is composed of a first epoxy resin and a second epoxy resin in a mass ratio of 7:3. The mass ratio of component A to component B is 10:1; A method for preparing a water-repellent, anchoring, and anti-corrosion coating includes the following steps: S1. Mix the raw materials of component A evenly, and grind them with a grinder to a fineness of ≤50μm to obtain mixture A; S2. Mix the raw materials of component B evenly to obtain mixture B; S3. When using, mix mixture A and mixture B evenly to obtain a water-repellent anchoring and anti-corrosion coating.

[0031] Example 3 A water-repellent, anchoring, and anti-corrosion coating, comprising component A, which includes the following raw materials by weight: 35 parts epoxy resin, 12 parts rutile titanium dioxide, 20 parts cerium oxide, 50 parts talc, 12 parts n-butanol, and 3 parts additive A, wherein additive A is composed of leveling agents BYK-333, Defom6800, and EFKA-4080 in a mass ratio of 1:1:1; and component B, which includes the following raw materials by weight: 80 parts curing agent, 12 parts additive B, and 22 parts n-butanol, wherein additive B is tallow diamine dioleate, and the epoxy resin is composed of a first epoxy resin and a second epoxy resin in a mass ratio of 7:3. The mass ratio of component A to component B is 100:12.5; A method for preparing a water-repellent, anchoring, and anti-corrosion coating includes the following steps: S1. Mix the raw materials of component A evenly, and grind them with a grinder to a fineness of ≤50μm to obtain mixture A; S2. Mix the raw materials of component B evenly to obtain mixture B; S3. When using, mix mixture A and mixture B evenly to obtain a water-repellent anchoring and anti-corrosion coating.

[0032] Example 4 The difference between Example 4 and Example 2 is that the epoxy resin is composed of a first epoxy resin and a second epoxy resin in a mass ratio of 7:4.

[0033] Example 5 Compared with Example 4, Example 5 differs in that the first epoxy resin (epoxy equivalent of 165~175 g / eq, viscosity of 3500~4500 mPa.S, model EMTE170, purchased from Wuhan Diergu New Materials Co., Ltd.) is replaced with an equal amount of epoxy resin (epoxy equivalent of 155~165 g / eq, viscosity ≤1600 Pa.S, model EMTE160, purchased from Wuhan Diergu New Materials Co., Ltd.).

[0034] Example 6 Compared with Example 4, Example 6 differs in that the first epoxy resin (epoxy equivalent of 165~175 g / eq, viscosity of 3500~4500 mPa.S, model EMTE170, purchased from Wuhan Diergu New Materials Co., Ltd.) is replaced with an equal amount of epoxy resin (epoxy equivalent of 165~175 g / eq, viscosity of 5000~6000 Pa.S, model EMTE170H, purchased from Wuhan Diergu New Materials Co., Ltd.).

[0035] Example 7 The difference between Example 7 and Example 4 is that the auxiliary agent B is choline.

[0036] Example 8 The difference between Example 8 and Example 4 is that the additive B is composed of tallow diamine dioleate and choline in a mass ratio of 7:3.

[0037] Example 9 The difference between Example 9 and Example 4 is that the additive B is composed of tallow diamine dioleate and choline in a mass ratio of 8:3.

[0038] Comparative Example 1 The difference between Comparative Example 1 and Example 2 is that the epoxy resin used is only the first epoxy resin.

[0039] Comparative Example 2 The difference between Comparative Example 2 and Example 2 is that the epoxy resin used is only the second epoxy resin.

[0040] Experimental Example 1 The water-repellent anchoring anti-corrosion coatings prepared in Examples 1-6 and Comparative Examples 1-2 were sprayed onto the surface of sandblasted steel plates with water, and the film thickness was 80 μm. The salt spray resistance of the samples was tested according to the test method specified in GB / T 1771-2007 "Determination of resistance to neutral salt spray of paints and varnishes". The time when the anti-corrosion primer showed phenomena such as bubbling, rusting, cracking and peeling was recorded.

[0041] The test results are shown in Table 1: Table 1 Performance test results of Examples 1-6 and Comparative Examples 1-2

[0042] As shown in Table 1, when the epoxy resin is composed of a first epoxy resin and a second epoxy resin with different epoxy equivalents and viscosities, the anti-corrosion performance of the water-repellent anchoring anti-corrosion coating can be improved.

[0043] Experiment Example 2 The water-repellent anchoring anti-corrosion coatings prepared in Examples 4 and 7-9 were sprayed onto the surface of a sandblasted steel plate with water, and the film thickness was 80 μm. The adhesion of the coating was tested at a rate of 10 mm / min according to the test method specified in GB / T 5210-2006 "Paints and Varnishes - Pull-off Adhesion Test".

[0044] The test results are shown in Table 2: Table 2 Performance test results of Examples 4 and 7-9

[0045] As shown in Table 2, when additive B is composed of tallow diamine dioleate and choline, it can improve the adhesion of water-repellent anchoring anti-corrosion coating.

[0046] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A water-repellent, anchoring, and anti-corrosion coating, composed of component A and component B, characterized in that, Component A comprises the following raw materials in parts by weight: 25-35 parts epoxy resin, 8-12 parts pigment, 15-20 parts preservative, 40-50 parts filler, 5-12 parts solvent A, and 1-3 parts additive A; Component B comprises the following raw materials in parts by weight: 70-80 parts curing agent, 8-12 parts additive B, and 8-22 parts solvent B. The epoxy resin is composed of a first epoxy resin and a second epoxy resin, wherein the epoxy equivalent and viscosity of the first epoxy resin are both less than those of the second epoxy resin.

2. The water-repellent anchoring and anti-corrosion coating according to claim 1, characterized in that, The first epoxy resin has an epoxy equivalent of 165~175 g / eq and a viscosity of 3500~4500 mPa·s, while the second epoxy resin has an epoxy equivalent of 185~200 g / eq and a viscosity of 10000~15000 mPa·s.

3. The water-repellent anchoring and anti-corrosion coating according to claim 1, characterized in that, The mass ratio of the first epoxy resin to the second epoxy resin is 7:3~4.

4. The water-repellent anchoring and anti-corrosion coating according to claim 1, characterized in that, The mass ratio of component A to component B is 100:10~12.

5.

5. The water-repellent anchoring and anti-corrosion coating according to claim 1, characterized in that, The pigments include one or more of rutile titanium dioxide, carbon black, and iron oxide red. The corrosion inhibitor includes one or more of phosphates, polyphosphates, and metal oxides; The filler includes one or more of wollastonite powder, talc powder, and precipitated barium sulfate; Solvent A and solvent B each independently include one or more of xylene, n-butanol, butyl acetate, and cyclohexanone.

6. The water-repellent anchoring and anti-corrosion coating according to claim 1, characterized in that, The additive A includes one or more of the following: leveling agent, defoamer, and dispersant; The leveling agent includes one or both of BYK-333 and BYK-358N; The defoamer includes one or both of Defom6800 and KU-P465; The dispersant includes one or more of EFKA-4080, BYK-163, and AFC0NA PF502.

7. The water-repellent anchoring and anti-corrosion coating according to claim 1, characterized in that, The adjuvant B is a quaternary ammonium salt compound with an alkyl chain, and the quaternary ammonium salt compound includes one or both of tallow diamine dioleate and choline.

8. The water-repellent anchoring and anti-corrosion coating according to claim 7, characterized in that, The adjuvant B is composed of tallow diamine dioleate and choline in a mass ratio of 7~8:

3.

9. A method for preparing a water-repellent anchoring anti-corrosion coating, used to prepare the water-repellent anchoring anti-corrosion coating according to any one of claims 1 to 8, characterized in that, Includes the following steps: S1. Mix the raw material of component A evenly, and grind it to obtain mixture A; S2. Mix the raw materials of component B evenly to obtain mixture B; S3. When using, mix the mixture A and the mixture B evenly to obtain the water-repellent anchoring and anti-corrosion coating.

10. The application of the water-repellent anchoring anti-corrosion coating prepared by any one of claims 1 to 8 or by the preparation method of the water-repellent anchoring anti-corrosion coating according to claim 9 in construction under environments such as high humidity, slightly water-containing substrates, and areas with alternating dry and wet conditions.

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