Corrosion-resistant cable bridge coating and cable bridge

Abstract

The invention discloses a corrosion-resistant cable bridge coating and a cable bridge, and the corrosion-resistant cable bridge coating is prepared from the following raw materials in parts by mass: 40 to 60 parts of epoxy resin, 20 to 40 parts of filler and 1.2 to 1.8 parts of curing agent; 5-8 parts of a phosphate corrosion inhibitor and 4-6 parts of phosphatized metal powder; the phosphate corrosion inhibitor and the phosphating metal powder not only can enhance the strength and the adhesive force of a coating, but also have a synergistic effect: the phosphating metal powder is embedded into a film formed by reaction of the phosphate corrosion inhibitor on the surface of a metal structure; and moreover, the phosphatized metal powder forms a more compact and uniform distribution layer in the coating, so that the salt spray corrosion resistance of the coating cured coating is remarkably improved, the service life of the cable bridge is prolonged, and the maintenance cost is reduced.

Description

Technical Field

[0001] The present application relates to a cable bridge, and more particularly to a corrosion-resistant cable bridge coating and a cable bridge. Background Art

[0002] As an indispensable part of modern buildings and industrial facilities, cable trays play a key role in supporting and protecting cables. With the advancement of technology, various functional coatings are applied to cable trays to improve their comprehensive properties such as corrosion resistance, fire resistance, and insulation.

[0003] Although the corrosion-resistant coatings currently on the market can improve the corrosion resistance of cable trays to a certain extent, the protective effect of traditional coatings is often difficult to meet the needs of long-term use in highly corrosive environments such as chemical plants and marine facilities. The salt spray, humidity and chemical erosion in these environments are particularly severe tests on materials, making traditional protective measures seem inadequate.

[0004] In order to solve this problem, it is necessary to develop new high-performance coatings that not only have basic protective functions, but also have excellent chemical corrosion resistance and long-term stability. In harsh environments, a solid protective layer is formed to effectively isolate external corrosion factors and ensure the long-term durability of the cable tray. This high-performance coating should be able to maintain the stability of its physical and chemical properties under extreme conditions, thereby extending the service life of the cable tray and reducing maintenance costs. Summary of the invention

[0005] In order to reduce the maintenance cost of the cable tray, a corrosion-resistant cable tray paint and a cable tray are provided.

[0006] The above first invention objective of the present invention is achieved through the following technical solutions: A corrosion-resistant cable tray coating comprises the following raw materials in parts by weight: 40-60 parts of epoxy resin, 20-40 parts of filler, 1.2-1.8 parts of curing agent; Phosphate anticorrosive agent 5-8 parts, 4-6 parts of metal phosphide powder; 18 to 26 parts of diluent.

[0007] By adopting the above technical solution, the phosphating metal powder can enhance the coating strength of the cured paint, and the phosphating film on the surface of the phosphating metal powder can transform the surface of the metal powder from a good conductor to a poor conductor, thereby effectively inhibiting the formation of micro-batteries on the metal surface and reducing the occurrence of electrochemical corrosion; Phosphate anticorrosive agents can form a two-dimensional ordered monomolecular film on the surface of the metal cable bridge structure through physical or chemical adsorption, blocking the contact between the corrosive medium and the metal matrix; When the two are used in combination, they can achieve a synergistic effect: Phosphate anticorrosive agents can promote the dispersion of phosphated metal powder in the coating and prevent sedimentation; the phosphate crystals of the phosphating film on the surface of the phosphated metal powder enable the phosphated metal powder to be embedded in the monomolecular film formed on the surface of the metal cable bridge structure, thereby enhancing the bonding strength between the surface monomolecular film and the cable bridge structure; In addition, during the volatilization process of the diluent in the coating, the concentration of the phosphate anti-corrosion agent in the coating continues to increase. The phosphate anti-corrosion agent will react with the phosphate of the phosphating film on the surface of the metal phosphating powder and the intermolecular force, so that the metal phosphating powder forms a denser and more evenly distributed layer in the coating, which not only has a stronger physical barrier effect, but also can be more stably combined through chemical bonding and other methods, thereby further enhancing the salt spray corrosion resistance of the coating.

[0008] Optionally, the phosphide metal powder is obtained by phosphating a precursor metal powder, and the precursor metal powder is copper powder or zinc powder.

[0009] By adopting the above technical solution, the obtained cable tray coating has better salt spray corrosion resistance.

[0010] Optionally: the phosphate corrosion inhibitor is octyl diphenyl phosphate.

[0011] By adopting the above technical scheme, octyl diphenyl phosphate reacts with iron faster, and forms good friction adhesion bearing capacity and salt spray corrosion resistance. The coating obtained by curing the coating has better adhesion and salt spray corrosion resistance.

[0012] Optionally, the filler is one or more of glass flakes and mica powder.

[0013] By adopting the high-speed technical solution, the glass flakes and mica powder have a dense structure and can be expanded along the coating adhesion direction after the paint is applied, which hinders the penetration of external corrosive media and makes the paint-cured coating more resistant to salt spray corrosion.

[0014] Optionally, the particle size of the metal phosphide powder is 100 to 120 μm.

[0015] By adopting the above technical solution, the coating strength and salt spray corrosion resistance of the paint cured are both excellent.

[0016] Optionally, the invention further comprises 0.4 to 0.8 parts of a coordination enhancer, wherein the coordination enhancer is graphene or a derivative thereof.

[0017] By adopting the above technical scheme, graphene or its derivatives can improve the curing structure of the coating, enhance the strength and adhesion of the coating on the one hand, and on the other hand, the conductive property of graphene enables it to be used as a cathodic protection material to protect the cathode metal through sacrificial anode, thereby slowing down or preventing the corrosion process of the metal. When graphene or its derivatives are used in conjunction with zinc powder as a precursor as a phosphide metal powder, the salt spray corrosion resistance of the coating can be significantly improved.

[0018] Optionally: the coordination enhancer is hyperbranched modified graphene.

[0019] By adopting the above technical solution, the dispersibility of the coordination enhancer in the coating is improved, the reinforcing effect of the coordination enhancer on the cured coating of the coating is enhanced, and the synergistic effect of the coordination enhancer and the phosphating metal powder with zinc powder as a precursor is enhanced.

[0020] The above second invention objective of the present invention is achieved through the following technical solutions: A cable bridge comprises a bridge body and an anti-corrosion coating covering the surface of the bridge body, wherein the anti-corrosion coating is formed by coating and curing the above-mentioned corrosion-resistant cable bridge paint.

[0021] By adopting the above technical solution, the anti-corrosion coating has good corrosion resistance, the cable tray has a long service life and low maintenance cost.

[0022] In summary, this application has at least the following beneficial effects: 1. The phosphate anticorrosion agent and the phosphating metal powder are added to the coating of the present application, which can not only enhance the strength and adhesion of the coating, but also have a synergistic effect - the phosphating metal powder is embedded in the film formed by the reaction of the phosphate anticorrosion agent on the surface of the metal structure, and the phosphating metal powder forms a more dense and uniform distribution layer in the coating, thereby significantly improving the salt spray corrosion resistance of the cured coating of the coating; 2. The glass flakes and mica powder have a dense structure and can be spread along the coating adhesion direction after coating, which hinders the penetration of external corrosive media and makes the coating cured by the coating have better salt spray corrosion resistance; 3. Graphene or its derivatives are also added as a coordination enhancer. On the one hand, it can improve the curing structure of the coating and enhance the strength and adhesion of the coating. On the other hand, the conductive property of graphene enables it to be used as a cathodic protection material to protect the cathode metal through sacrificial anodes, thereby slowing down or preventing the corrosion process of the metal. When graphene or its derivatives are used in conjunction with zinc powder as a precursor as a phosphide metal powder, the salt spray corrosion resistance of the coating can be significantly improved. DETAILED DESCRIPTION

[0023] raw material The epoxy resin is Phoenix brand epoxy resin 618 (E51).

[0024] The hyperbranched polyester is a Kramar product, an epoxy-terminated hyperbranched polyester.

[0025] Graphene, with a thickness of 1 nm, a particle size distribution of 3 μm, and a purity of >99 wt%, is a commercially available product of Beijing Zhongke Leiming Technology Co., Ltd.

[0026] The graphene oxide has a thickness of 1 nm, a particle size distribution of 3 μm, and a purity of >95 wt %, and is a commercially available product of Beijing Zhongke Leiming Technology Co., Ltd.

[0027] DMF, n-butanol, potassium dihydrogen phosphate, octyl diphenyl phosphate, and tritolyl phosphate are commercially available products with a purity greater than 99.5 wt %.

[0028] Hexamethylenediamine, acetone, and anhydrous ethanol are commercially available industrial grade products with a purity greater than 99.0wt% Zinc powder, copper powder and aluminum powder are commercially available products. The specific particle size specifications are shown in the specific preparation examples, embodiments and comparative examples below.

[0029] Glass flakes are commercially available products with a particle size of 325 mesh; mica powder is a commercially available product with a particle size of 325 mesh; and zirconium oxide powder is a commercially available product with a particle size of 44 μm.

[0030] Preparation Example 1 Hyperbranched modified graphene, the specific preparation method is as follows: 56 g of hyperbranched polyester was dissolved in 300 g of DMF, and 120 g of n-butanol was added and mixed to obtain material A; 8.2 g of graphene oxide was added to 40 g of DMF, and material B was obtained after ultrasonic dispersion; The material A is heated to 110-115° C., and the material B is added in batches in three equal parts, and the reaction is stirred for 10 hours to obtain a reaction material; the reaction material is centrifuged to obtain a precipitate, and the precipitate is washed with DMF, and the hyperbranched modified graphene is obtained after drying.

[0031] Preparation Example 2 A phosphide metal powder, the preparation method of which is as follows: 1 kg of the precursor metal powder was weighed and added into 20 kg of 0.08 mol / L potassium dihydrogen phosphate solution at 43°C, and the mixture was stirred for 7 minutes; the precipitate was obtained by filtration, and the precipitate was first washed with water to remove the residual potassium dihydrogen phosphate, and then washed with anhydrous ethanol to remove the water to obtain a wet product; The wet material is dried and sieved to select powder of 110±1 μm to obtain metal phosphide powder.

[0032] The precursor metal powder is 100 μm zinc powder.

[0033] Preparation Example 3 A phosphide metal powder, which is different from Preparation Example 2 in that the precursor metal powder is 100 μm copper powder.

[0034] Preparation Example 4 A phosphide metal powder, which is different from Preparation Example 2 in that the precursor metal powder is 100 μm aluminum powder.

[0035] Preparation Example 5 A phosphide metal powder, which is different from Preparation Example 2 in that the precursor metal powder is 40 μm zinc powder, and the wet material is dried and sieved to select 50±1 μm powder as the phosphide metal powder.

[0036] Preparation Example 6 A phosphide metal powder, which is different from Preparation Example 2 in that the precursor metal powder is 90 μm zinc powder, and the wet material is dried and sieved to select 100±1 μm powder as the phosphide metal powder.

[0037] Preparation Example 7 A phosphide metal powder, which is different from Preparation Example 2 in that the precursor metal powder is 110 μm zinc powder, and the wet material is dried and sieved to select 120±1 μm powder as the phosphide metal powder.

[0038] Preparation Example 8 A phosphide metal powder, which is different from Preparation Example 2 in that the precursor metal powder is 190 μm zinc powder, and the wet material is dried and sieved to select 200±1 μm powder as the phosphide metal powder.

[0039] Example 1 A corrosion-resistant cable bridge paint, the raw materials of which are epoxy resin, filler, phosphate corrosion inhibitor, phosphating metal powder, coordination reinforcing agent, curing agent and diluent.

[0040] The filler is a mixture of glass flakes and mica powder in a mass ratio of 1:0.3.

[0041] The phosphate corrosion inhibitor was octyl diphenyl phosphate.

[0042] The metal phosphide powder is obtained in Preparation Example 2.

[0043] The coordination enhancer is the hyperbranched modified graphene of Preparation Example 1.

[0044] The curing agent is hexamethylenediamine.

[0045] The diluent is acetone.

[0046] The specific preparation method is as follows: 5 kg of epoxy resin, 2.4 kg of diluent, 3.7 kg of filler, and 0.52 kg of metal phosphide powder were mixed evenly, and then 0.66 kg of phosphate anticorrosion agent and 0.07 kg of coordination enhancer were added and stirred to obtain agent A; Add 0.16 kg of curing agent to agent A and mix well to obtain a corrosion-resistant cable tray coating.

[0047] Example 2 A corrosion-resistant cable tray coating, which differs from Example 1 in that the phosphide metal powder is obtained according to Preparation Example 3.

[0048] Example 3 A corrosion-resistant cable tray coating, which differs from Example 1 in that the phosphide metal powder is obtained according to Preparation Example 4.

[0049] Example 4 A corrosion-resistant cable tray coating, which differs from Example 1 in that the phosphate corrosion inhibitor is tritolyl phosphate.

[0050] Example 5 A corrosion-resistant cable tray coating, which differs from Example 1 in that the filler is glass flakes.

[0051] Example 6 A corrosion-resistant cable tray coating, which differs from Example 1 in that the filler is mica powder.

[0052] Example 7 A corrosion-resistant cable tray coating, which differs from Example 1 in that the filler is zirconium oxide powder.

[0053] Example 8 A corrosion-resistant cable tray coating, which differs from Example 1 in that the phosphide metal powder is obtained according to Preparation Example 5.

[0054] Example 9 A corrosion-resistant cable tray coating, which differs from Example 1 in that the phosphide metal powder is obtained according to Preparation Example 6.

[0055] Example 10 A corrosion-resistant cable tray coating, which differs from Example 1 in that the phosphide metal powder is obtained according to Preparation Example 7.

[0056] Embodiment 11 A corrosion-resistant cable tray coating, which differs from Example 1 in that the phosphide metal powder is obtained according to Preparation Example 8.

[0057] Example 12 A corrosion-resistant cable tray coating, which differs from Example 2 in that the amount of the coordinating enhancer is 0.

[0058] Example 13 A corrosion-resistant cable tray coating, which differs from Example 1 in that the amount of the coordinating enhancer is 0.

[0059] Embodiment 14 A corrosion-resistant cable tray coating, which differs from Example 1 in that the coordination enhancer is graphene.

[0060] Embodiment 15 A corrosion-resistant cable tray coating, which differs from Example 1 in that the dosage is different, specifically 4kg epoxy resin, 1.8kg diluent, 2kg filler, 4kg metal phosphide powder, 0.5kg phosphate anti-corrosion agent, 0.04kg coordination enhancer, and 0.12kg curing agent.

[0061] Example 16 A corrosion-resistant cable tray coating, which differs from Example 1 in that the dosage is different, specifically 6kg epoxy resin, 2.6kg diluent, 4kg filler, 6kg metal phosphide powder, 0.8kg phosphate anti-corrosion agent, 0.08kg coordination enhancer, and 0.18kg curing agent.

[0062] Comparative Example 1 A cable bridge paint, the raw materials of which are epoxy resin, filler, phosphate anticorrosive agent, coordination enhancer, curing agent and diluent.

[0063] The filler is a mixture of glass flakes and mica powder in a mass ratio of 1:0.3.

[0064] The phosphate corrosion inhibitor was octyl diphenyl phosphate.

[0065] The coordination enhancer is the hyperbranched modified graphene of Preparation Example 1.

[0066] The curing agent is hexamethylenediamine.

[0067] The diluent is acetone.

[0068] The specific preparation method is as follows: 5 kg of epoxy resin, 2.4 kg of diluent and 3.7 kg of filler were mixed evenly, and then 0.66 kg of phosphate anticorrosive agent and 0.07 kg of coordination enhancer were added and stirred to obtain agent A; Add 0.16 kg of curing agent to agent A and mix well to obtain a corrosion-resistant cable tray coating.

[0069] Comparative Example 2 A cable bridge paint, the raw materials of which are epoxy resin, filler, phosphating metal powder, coordination reinforcing agent, curing agent and diluent.

[0070] The filler is a mixture of glass flakes and mica powder in a mass ratio of 1:0.3.

[0071] The metal phosphide powder is obtained in Preparation Example 2.

[0072] The coordination enhancer is the hyperbranched modified graphene of Preparation Example 1.

[0073] The curing agent is hexamethylenediamine.

[0074] The diluent is acetone.

[0075] The specific preparation method is as follows: 5 kg of epoxy resin, 2.4 kg of diluent, 3.7 kg of filler, and 0.52 kg of metal phosphide powder were mixed evenly, and then 0.66 kg of phosphate anticorrosion agent and 0.07 kg of coordination enhancer were added and stirred to obtain agent A; Add 0.16 kg of curing agent to agent A and mix well to obtain a corrosion-resistant cable tray coating.

[0076] Comparative Example 3 A corrosion-resistant cable tray coating, the raw materials of which are epoxy resin, filler, phosphate anticorrosive agent, metal powder, coordination enhancer, curing agent and diluent.

[0077] The filler is a mixture of glass flakes and mica powder in a mass ratio of 1:0.3.

[0078] The phosphate corrosion inhibitor was octyl diphenyl phosphate.

[0079] The metal powder is zinc powder with a particle size of 100 μm.

[0080] The coordination enhancer is the hyperbranched modified graphene of Preparation Example 1.

[0081] The curing agent is hexamethylenediamine.

[0082] The diluent is acetone.

[0083] The specific preparation method is as follows: 5 kg of epoxy resin, 2.4 kg of diluent, 3.7 kg of filler, and 0.52 kg of metal phosphide powder were mixed evenly, and then 0.66 kg of phosphate anticorrosion agent and 0.07 kg of coordination enhancer were added and stirred to obtain agent A; Add 0.16 kg of curing agent to agent A and mix well to obtain a corrosion-resistant cable tray coating.

[0084] Comparative Example 4 A corrosion-resistant cable tray coating, the raw materials of which are epoxy resin, filler, phosphate anticorrosive agent, metal powder, coordination enhancer, curing agent and diluent.

[0085] The filler is a mixture of glass flakes and mica powder in a mass ratio of 1:0.3.

[0086] The phosphate corrosion inhibitor was octyl diphenyl phosphate.

[0087] The metal powder is copper powder with a particle size of 100 μm.

[0088] The coordination enhancer is the hyperbranched modified graphene of Preparation Example 1.

[0089] The curing agent is hexamethylenediamine.

[0090] The diluent is acetone.

[0091] The specific preparation method is as follows: 5 kg of epoxy resin, 2.4 kg of diluent, 3.7 kg of filler, and 0.52 kg of metal phosphide powder were mixed evenly, and then 0.66 kg of phosphate anticorrosion agent and 0.07 kg of coordination enhancer were added and stirred to obtain agent A; Add 0.16 kg of curing agent to agent A and mix well to obtain a corrosion-resistant cable tray coating.

[0092] The coatings of Examples 1 to 16 and Comparative Examples 1 to 4 were tested, and a 10 cm long and 10 cm wide galvanized iron plate was used as a substrate, on which a 0.5 mm thick coating was applied. The test contents included initial salt spray corrosion resistance test and coating bonding strength test.

[0093] The salt spray corrosion resistance test is carried out according to GB / T1771, using neutral salt spray at a temperature of 25°C. The test results are expressed in salt spray corrosion resistance time. The longer the salt spray corrosion resistance time, the better the salt spray corrosion resistance performance.

[0094] The coating adhesion test is carried out using the cross-hatch method in GB / T10610. The test results are expressed in adhesion grades, which are divided into 0 to 5 levels, with 0 being the best and 5 being the worst. The closer the adhesion grade is to 0, the better the coating adhesion.

[0095] The test results are shown in Table 1 below.

[0096] Table 1. Coating test results of Examples 1 to 16 and Comparative Examples 1 to 4 Combined with Table 1, comparing Example 1 with Comparative Examples 1 to 4, the salt spray corrosion resistance of Example 1 is significantly better than that of Comparative Examples 1 to 4; the coating adhesion test result of Example 1 is significantly better than that of Comparative Examples 1 to 4, especially significantly better than that of Comparative Examples 3 to 4.

[0097] In Example 1, the raw materials are added with phosphating metal powder and phosphate corrosion inhibitor at the same time. The phosphating metal powder can enhance the coating strength of the cured coating. The phosphating film on the surface of the phosphating metal powder can transform the surface of the metal powder from a good conductor to a poor conductor, thereby effectively inhibiting the formation of micro-batteries on the metal surface and reducing the occurrence of electrochemical corrosion. The phosphate corrosion inhibitor can form a two-dimensional ordered monomolecular film on the surface of the metal cable bridge structure through physical or chemical adsorption, thereby blocking the contact between the corrosive medium and the metal substrate. And when the two are used in combination in the present application, a synergistic effect can be achieved: the phosphate corrosion inhibitor can promote the dispersion and anti-sedimentation of the phosphated metal powder in the coating; the phosphate crystals of the phosphating film on the surface of the phosphated metal powder enable the phosphated metal powder to be embedded in it when the monomolecular film is formed on the surface of the metal cable bridge structure body, thereby enhancing the bonding strength between the surface monomolecular film and the cable bridge structure body; in addition, during the volatilization process of the diluent in the coating, the concentration of the phosphate corrosion inhibitor in the coating continues to increase, and the phosphate corrosion inhibitor will react with the phosphate of the phosphating film on the surface of the phosphated metal powder and the intermolecular force, so that the phosphated metal powder forms a more dense and evenly distributed layer in the coating, which not only has a stronger physical barrier effect, but can also be more stably bonded through chemical bonding and other methods, thereby further enhancing the salt spray corrosion resistance of the coating.

[0098] In Comparative Examples 3-4, the phosphating metal powder is replaced by metal powder, which not only accelerates the electrochemical corrosion, but also consumes the phosphate anti-corrosion agent extra, so its adhesion is reduced.

[0099] Compared with Examples 1 to 3, the salt spray corrosion resistance of Examples 1 to 2 is better than that of Example 3, so the precursor metal powder of the phosphating metal powder in the present application is preferably zinc powder or copper powder.

[0100] In addition, by comparing Example 1 and Example 2, it can be seen that the salt spray corrosion resistance of Example 1 is significantly better than that of Example 2.

[0101] In combination with Examples 12 to 13, Example 12 is based on Example 2 without the addition of the coordination enhancer, and Example 13 is based on Example 1 without the addition of the coordination enhancer; the salt spray corrosion resistance and coating adhesion of Example 12 are lower than those of Example 2, and the salt spray corrosion resistance and coating adhesion of Example 13 are lower than those of Example 1, and by comparing the test results of Examples 12 to 13, it can be seen that the salt spray corrosion resistance of Examples 12 to 13 is similar, so it can be seen that the coordination enhancer can improve the coating curing structure, enhance the coating strength and adhesion, and on the other hand, the conductive property of the coordination enhancer enables it to be used as a cathodic protection material, protecting the cathode metal by sacrificing the anode, thereby slowing down or preventing the corrosion process of the metal, and when the coordination enhancer is used in conjunction with zinc powder as a precursor as a phosphide metal powder, the salt spray corrosion resistance of the coating can be significantly improved.

[0102] In combination with Example 13 and Example 14, it can be seen that the salt spray corrosion resistance and coating adhesion of Example 14 are better than those of Example 13, and the salt spray corrosion resistance and coating adhesion of Example 1 are better than those of Example 14. Therefore, the coordination enhancer of the present application can be graphene or its derivatives, among which hyperbranched modified graphene oxide is preferred, and the obtained coating cured coating has better salt spray corrosion resistance.

[0103] Combining Example 1, Example 4, and Comparative Example 2, it can be seen that the salt spray corrosion resistance and coating adhesion of Example 4 are better than those of Comparative Example 2, and the salt spray corrosion resistance and coating adhesion of Example 1 are better than those of Example 4. It can be seen that the phosphate anti-corrosion agent in the present application can also be tritolyl phosphate, among which octyl diphenyl phosphate is preferred, and the obtained coating cured coating has better salt spray corrosion resistance.

[0104] Combining Example 1 and Examples 5 to 7, it can be known that the fillers used in Examples 5 to 7 are different from those in Example 1. Example 1 is a compound of glass flakes and mica powder, Example 5 is a single glass flake, Example 6 is a single mica powder, and Example 7 is zirconium oxide powder. The test results show that the salt spray corrosion resistance is from high to low: Example 1, Example 5, Example 6, Example 7, and Example 8. Therefore, when one or two of glass flakes and mica powder are selected as fillers in the present application, the resulting cured coating has better salt spray corrosion resistance.

[0105] Combining Example 1 with Examples 8 to 11, it can be seen that the particle size of the metal phosphide powder in the coating will affect the effect of its function, and then affect the salt spray corrosion resistance and coating adhesion of the cured coating of the coating.

[0106] The particle size of the metal phosphide powder of Example 8 is 50 μm, the particle size of the metal phosphide powder of Example 9 is 100 μm, the particle size of the metal phosphide powder of Example 1 is 110 μm, the particle size of the metal phosphide powder of Example 10 is 120 μm, and the particle size of the metal phosphide powder of Example 11 is 200 μm.

[0107] The salt spray corrosion resistance in Example 1 and Examples 8 to 11 is from high to low as follows: Example 1, Example 9, Example 10, Example 11, and Example 8; in Example 1 and Examples 8 to 11, the coating adhesion grade of Example 1, Example 9, and Example 10 is 0, and the coating adhesion grade of Example 11 and Example 8 is 1. Therefore, when the particle size of the phosphating metal powder in the present application is 100 to 120 μm, the salt spray corrosion resistance and coating adhesion of the obtained coating cured coating are better.

[0108] Combined with Examples 15 to 16 and Comparative Examples 1 to 4, it can be seen that the salt spray corrosion resistance and coating adhesion of Examples 15 to 16 are significantly better than those of Comparative Examples 1 to 4. Therefore, when the mass ratio of epoxy resin, filler, curing agent, phosphate anti-corrosion agent, metal phosphide powder, and diluent in the raw materials of the corrosion-resistant cable tray coating of the present application is controlled to be (40 to 60):(20 to 40):(1.2 to 1.8):(5 to 8):(4 to 6):(18 to 26), the salt spray corrosion resistance and coating adhesion of the obtained cured coating are better.

[0109] Embodiment 17 A cable bridge comprises a bridge frame body. The bridge frame body is formed by bending a metal plate through sheet metal operation. An anti-corrosion coating is evenly attached to the outer surface of the bridge frame body.

[0110] The anti-corrosion coating is formed by curing a corrosion-resistant cable tray paint, and the corrosion-resistant cable tray paint is one of Examples 1 to 16.

[0111] This specific embodiment is only an explanation of the present invention, and it is not a limitation of the present invention. After reading this specification, those skilled in the art can make non-creative modifications to this embodiment as needed, but as long as it is within the scope of protection required by the present invention, it will be protected by the patent law.

Claims

1. A corrosion-resistant cable tray coating, characterized in that: Including the following raw materials by mass: Epoxy resin 40~60 parts, 20~40 parts of filler, 1.2~1.8 parts of curing agent; Phosphate anticorrosive agent 5-8 parts, 4-6 parts of metal phosphide powder; 18~26 parts of diluent.

2. A corrosion-resistant cable tray coating according to claim 1, characterized in that: The phosphated metal powder is obtained by phosphating a precursor metal powder, and the precursor metal powder is copper powder or zinc powder.

3. The corrosion-resistant cable tray coating according to claim 1, characterized in that: The phosphate anticorrosion agent is octyl diphenyl phosphate.

4. The corrosion-resistant cable tray coating according to claim 1, characterized in that: The filler is one or more of glass flakes and mica powder.

5. The corrosion-resistant cable tray coating according to claim 1, characterized in that: The particle size of the metal phosphide powder is 100-120 μm.

6. The corrosion-resistant cable tray coating according to claim 1, characterized in that: The invention also comprises 0.4 to 0.8 parts of a coordination enhancer, wherein the coordination enhancer is graphene or a derivative thereof.

7. The corrosion-resistant cable tray coating according to claim 1, characterized in that: The coordination enhancer is hyperbranched modified graphene.

8. A cable tray, characterized in that: It comprises a bridge frame body and an anti-corrosion coating covering the surface of the bridge frame body, wherein the anti-corrosion coating is formed by coating and curing the corrosion-resistant cable bridge frame paint as described in any one of claims 1 to 7.

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