A multifunctional repair agent for the surface of power facilities and its preparation method

Abstract

The present invention relates to the technical field of insulating coatings, and in particular to a multifunctional surface repair agent for power facilities and a preparation method thereof. The multifunctional surface repair agent comprises the following components: 22-34 parts by weight of a modified polyurethane resin, 5-13 parts by weight of a 1,6-hexamethylene diisocyanate trimer curing agent, 12-18 parts by weight of silicon powder, 6-9 parts by weight of aluminum oxide, 2-5 parts by weight of sodium molybdate, 0.6-0.8 parts by weight of an antioxidant, 0.5-1 parts by weight of a leveling agent, 0.4-0.7 parts by weight of a defoaming agent, 1-3 parts by weight of an anti-ultraviolet agent, and 12-18 parts by weight of methyl isobutyl ketone. The modified polyurethane resin is prepared by mixing and modifying phosphoryl succinic acid and a polyurethane resin in a molar ratio of 1:8-15. The phosphoryl succinic acid is used to prepare the modified polyurethane resin, thereby improving the adhesion of the coating on the metal surface, enhancing the chemical stability and corrosion resistance of the metal surface, and further improving the flame retardant performance of the resin, thereby extending the service life of the equipment and lines after spraying.

Description

Technical Field

[0001] The present invention relates to the technical field of insulating coatings, in particular to a multifunctional repairing agent for the surface of electric power facilities and a preparation method thereof. Background Art

[0002] As the cornerstone of modern society's energy supply, the stable operation of power facilities is of vital importance. However, long-term exposure to complex and changing environmental conditions often causes the surface of power facilities to suffer various damages, including corrosion, oxidation, accumulation of dirt, and mechanical wear. These problems can easily lead to safety hazards, reduce power transmission efficiency, and even cause equipment failure. Insulating coatings can form a fully enclosed insulating layer on the surface of the conductor, using the solid insulating medium of the insulating layer to withstand high voltage, eliminating failures caused by short-circuiting of the air insulation distance.

[0003] In the existing technology, insulating coatings used in power systems need to meet the strict requirements of the power system in terms of insulation performance, heat resistance, weather resistance, mechanical strength and rapid curing. However, traditional insulating coatings have single performance and relatively poor adhesion to metal surfaces. Long-term operation or extreme weather conditions will cause the insulation layer to fall off and lose its protective effectiveness. In view of this, we propose a multifunctional repair agent for the surface of power facilities and a preparation method. Summary of the Invention

[0004] The purpose of the present invention is to provide a multifunctional repair agent for the surface of power facilities and a preparation method thereof, so as to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned object, the present invention provides a multifunctional repair agent for the surface of power facilities, comprising the following components: 22-34 parts by weight of a modified polyurethane resin, 5-13 parts by weight of a 1,6-hexamethylene diisocyanate trimer curing agent, 12-18 parts by weight of silica powder, 6-9 parts by weight of aluminum oxide, 2-5 parts by weight of sodium molybdate, 0.6-0.8 parts by weight of an antioxidant, 0.5-1 parts by weight of a leveling agent, 0.4-0.7 parts by weight of a defoaming agent, 1-3 parts by weight of an anti-ultraviolet agent, and 12-18 parts by weight of methyl isobutyl ketone;

[0006] The modified polyurethane resin is prepared by mixing phospho-succinic acid and polyurethane resin in a molar ratio of 1:8-15.

[0007] Preferably, the preparation method of the modified polyurethane resin is as follows:

[0008] In a round-bottom flask filled with xylene, polycarbonate diol and phosphobutyl succinic acid were weighed, and a dilute sulfuric acid solution was added to the flask. The flask containing the reaction mixture was placed in a heating mantle, the temperature was set to 110-120°C, and a magnetic stirrer was turned on. After the reaction had continued for 1-2 hours, heating was stopped and the reaction mixture was allowed to cool naturally to room temperature. Triethylamine was added to adjust the pH of the reaction mixture, and dibutyltin dilaurate was added. Under nitrogen protection, isophorone diisocyanate was added dropwise. The mixture was reheated to 80-100°C with continuous stirring. The reaction time was 2-4 hours to obtain a modified polyurethane resin.

[0009] Phosphoryl succinic acid contains carboxyl and phosphoryl groups. The carboxyl group can undergo an esterification reaction with the hydroxyl group on the polyurethane, thereby introducing carboxyl and phosphoryl groups into the polyurethane resin. When the metal is exposed to a humid environment, the metal surface may undergo an oxidation reaction to form metal oxides or hydroxides, so that the metal surface contains hydroxyl groups. The carboxyl groups introduced into the polyurethane resin can undergo an esterification reaction with the hydroxyl groups on the metal surface, thereby improving the adhesion of the coating to the metal surface. In addition, the carboxyl group can act as a bidentate ligand to form a coordination bond with the metal surface to form a stable complex, thereby forming a protective film and enhancing the chemical stability and corrosion resistance of the metal surface. At the same time, phosphoryl succinic acid can also improve the adhesion of the polyurethane resin to the metal. This is because the phosphorus atom in the phosphoryl group has a certain coordination ability, and the metal surface usually has metal ions or empty coordination sites. At this time, the oxygen atom in the phosphoryl group can provide lone pairs of electrons to form coordination bonds with the metal ions, thereby enhancing the bonding between the coating and the substrate. In addition, the phosphoryl group itself has certain flame retardant properties, which can further improve the flame retardant properties of the resin.

[0010] Preferably, the molar ratio of the phospho-succinic acid to the polycarbonate diol is 1:5-7.

[0011] Preferably, the molar ratio of the polycarbonate diol to isophorone diisocyanate is 1:0.7-0.9.

[0012] Preferably, the mass fraction of the dilute sulfuric acid solution is 1-5%, and the added amount is 0.1-0.5% of the mass of the polycarbonate diol.

[0013] Preferably, the dibutyltin dilaurate is 0.01-0.05% by mass of isophorone diisocyanate.

[0014] Preferably, the mass ratio of xylene to polycarbonate diol is 1:3-5.

[0015] Preferably, the amount of triethylamine added is 6-8% of the mass of isophorone diisocyanate, and the pH of the reaction mixture is adjusted to 7-9.

[0016] In another aspect, the present invention provides a method for preparing a multifunctional repair agent for the surface of a power facility, which is used for any of the multifunctional repair agents for the surface of a power facility described above, comprising the following steps:

[0017] The modified polyurethane resin, antioxidant, Byk-358N leveling agent, defoaming agent, UV inhibitor and methyl isobutyl ketone are added to a high-speed disperser. After high-speed dispersion for 15-20 minutes, the dispersion speed is adjusted to low-speed stirring, and then silicon micropowder, aluminum oxide and sodium molybdate are added. The stirring is continued until they are completely dispersed. Then, 1,6-hexamethylene diisocyanate trimer curing agent is added, and stirring is continued to ensure that all components are fully mixed to obtain a multifunctional repair agent for the surface of power facilities.

[0018] The multifunctional repair agent for the surface of power facilities prepared integrates insulation, waterproofing, fire prevention and corrosion resistance while ensuring the bonding strength of the metal surface, realizing the functions of insulation repair, anti-condensation, anti-icing and radiation cooling, thereby increasing the service life of the equipment and lines after spraying, reducing tripping faults caused by weather and birds and animals, and ensuring the normal operation of the power grid system.

[0019] Preferably, the high-speed dispersion speed is 1200-1500 rpm / min, and the low-speed dispersion speed is 300-500 rpm / min.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] In this multifunctional repair agent for the surface of power facilities and its preparation method, phosphobutyl succinic acid is used to prepare a modified polyurethane resin, carboxyl groups and phosphoryl groups are introduced into the polyurethane resin, and the chelation effect of the carboxyl groups and phosphoryl groups on the metal surface is utilized to improve the adhesion of the coating on the metal surface, and at the same time form a protective film to enhance the chemical stability and corrosion resistance of the metal surface. In addition, the introduced phosphoryl groups also have a flame retardant effect, which can further enhance the flame retardant properties of the resin and improve the service life of the equipment and lines after spraying. Inorganic insulating materials are added to the modified polyurethane resin, and through organic-inorganic hybridization, the cured repair agent has excellent ultraviolet aging resistance, anti-corrosion protection characteristics and temperature resistance. While ensuring the bonding strength of the coating on the metal surface, good insulation repair, anti-condensation, anti-icing and radiation cooling functions are achieved. DETAILED DESCRIPTION

[0022] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described 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 creative efforts are within the scope of protection of the present invention.

[0023] The multifunctional repair agent for the surface of power facilities of the present invention comprises the following components: 22-34 parts by weight of a modified polyurethane resin, 5-13 parts by weight of a hexamethylene diisocyanate trimer curing agent, 12-18 parts by weight of silica powder, 6-9 parts by weight of aluminum oxide, 2-5 parts by weight of sodium molybdate, 0.6-0.8 parts by weight of an Irganox 1010 antioxidant, 0.5-1 parts by weight of a Byk-358N leveling agent, 0.4-0.7 parts by weight of a Tego Airex 902W defoaming agent, 1-3 parts by weight of a Tinuvin 328 UV inhibitor, and 12-18 parts by weight of methyl isobutyl ketone.

[0024] The modified polyurethane resin is prepared by mixing phospho-succinic acid and polyurethane resin in a molar ratio of 1:8-15.

[0025] Example 1: A multifunctional repair agent for the surface of power facilities and a preparation method thereof, comprising the following steps:

[0026] Prepare the following components: 34 parts by weight of modified polyurethane resin, 13 parts by weight of hexamethylene diisocyanate trimer curing agent, 18 parts by weight of silica powder, 9 parts by weight of aluminum oxide, 5 parts by weight of sodium molybdate, 0.8 parts by weight of Irganox 1010 antioxidant, 1 part by weight of Byk-358N leveling agent, 0.7 parts by weight of Tego Airex 902W defoaming agent, 3 parts by weight of Tinuvin 328 anti-ultraviolet agent, and 18 parts by weight of methyl isobutyl ketone;

[0027] The modified polyurethane resin is prepared by mixing phosphobutyric acid and polyurethane resin in a molar ratio of 1:8; the molar ratio of phosphobutyric acid and polycarbonate diol is 1:5; and the molar ratio of polycarbonate diol and isophorone diisocyanate is 1:0.7.

[0028] In a round-bottom flask containing xylene, polycarbonate diol and phosphobutyl succinic acid were weighed in a mass ratio of xylene to polycarbonate diol of 1:5. A 1% by mass dilute sulfuric acid solution was added to the flask in an amount of 0.5% by mass of the polycarbonate diol. The flask containing the reaction mixture was placed in a heating mantle, the temperature was set to 120°C, and a magnetic stirrer was turned on. After reacting for 2 hours, heating was stopped and the reaction mixture was allowed to cool naturally to room temperature. Triethylamine was added to adjust the pH of the reaction mixture to 8 in an amount of 7% by mass of isophorone diisocyanate. Dibutyltin dilaurate was then added in an amount of 0.03% by mass of isophorone diisocyanate. Under nitrogen protection, isophorone diisocyanate was added dropwise. The mixture was reheated to 80°C with continuous stirring. The reaction time was 3 hours to obtain a modified polyurethane resin.

[0029] The modified polyurethane resin, Irganox 1010 antioxidant, Byk-358N leveling agent, Tego Airex 902W defoamer, Tinuvin 328 UV inhibitor and methyl isobutyl ketone were added to a high-speed disperser. After high-speed dispersion at 1500 rpm / min for 20 minutes, the dispersion speed was adjusted to 500 rpm / min, and then silica micropowder, aluminum oxide and sodium molybdate were added. The stirring was continued until they were completely dispersed. Then, 1,6-hexamethylene diisocyanate trimer curing agent was added, and stirring was continued to ensure that all components were fully mixed to obtain a multifunctional repair agent for the surface of power facilities.

[0030] Example 2: A multifunctional repair agent for the surface of power facilities and a preparation method thereof, comprising the following steps:

[0031] Prepare the following components: 34 parts by weight of modified polyurethane resin, 13 parts by weight of hexamethylene diisocyanate trimer curing agent, 18 parts by weight of silica powder, 9 parts by weight of aluminum oxide, 5 parts by weight of sodium molybdate, 0.8 parts by weight of Irganox 1010 antioxidant, 1 part by weight of Byk-358N leveling agent, 0.7 parts by weight of Tego Airex 902W defoaming agent, 3 parts by weight of Tinuvin 328 anti-ultraviolet agent, and 18 parts by weight of methyl isobutyl ketone;

[0032] The modified polyurethane resin is prepared by mixing phosphobutyric acid and polyurethane resin in a molar ratio of 1:12; the molar ratio of phosphobutyric acid and polycarbonate diol is 1:6; and the molar ratio of polycarbonate diol and isophorone diisocyanate is 1:0.8.

[0033] In a round-bottom flask containing xylene, polycarbonate diol and phosphobutyl succinic acid were weighed in a mass ratio of xylene to polycarbonate diol of 1:5. A 1% by mass dilute sulfuric acid solution was added to the flask in an amount of 0.5% by mass of the polycarbonate diol. The flask containing the reaction mixture was placed in a heating mantle, the temperature was set to 120°C, and a magnetic stirrer was turned on. After reacting for 2 hours, heating was stopped and the reaction mixture was allowed to cool naturally to room temperature. Triethylamine was added to adjust the pH of the reaction mixture to 8 in an amount of 7% by mass of isophorone diisocyanate. Dibutyltin dilaurate was then added in an amount of 0.03% by mass of isophorone diisocyanate. Under nitrogen protection, isophorone diisocyanate was added dropwise. The mixture was reheated to 80°C with continuous stirring. The reaction time was 3 hours to obtain a modified polyurethane resin.

[0034] The modified polyurethane resin, Irganox 1010 antioxidant, Byk-358N leveling agent, Tego Airex 902W defoamer, Tinuvin 328 UV inhibitor and methyl isobutyl ketone were added to a high-speed disperser. After high-speed dispersion at 1500 rpm / min for 20 minutes, the dispersion speed was adjusted to 500 rpm / min, and then silica micropowder, aluminum oxide and sodium molybdate were added. The stirring was continued until they were completely dispersed. Then, 1,6-hexamethylene diisocyanate trimer curing agent was added, and stirring was continued to ensure that all components were fully mixed to obtain a multifunctional repair agent for the surface of power facilities.

[0035] Example 3: A multifunctional repair agent for the surface of power facilities and a preparation method thereof, comprising the following steps:

[0036] Prepare the following components: 34 parts by weight of modified polyurethane resin, 13 parts by weight of hexamethylene diisocyanate trimer curing agent, 18 parts by weight of silica powder, 9 parts by weight of aluminum oxide, 5 parts by weight of sodium molybdate, 0.8 parts by weight of Irganox 1010 antioxidant, 1 part by weight of Byk-358N leveling agent, 0.7 parts by weight of Tego Airex 902W defoaming agent, 3 parts by weight of Tinuvin 328 anti-ultraviolet agent, and 18 parts by weight of methyl isobutyl ketone;

[0037] The modified polyurethane resin is prepared by mixing phosphobutyric acid and polyurethane resin in a molar ratio of 1:15; the molar ratio of phosphobutyric acid and polycarbonate diol is 1:7; and the molar ratio of polycarbonate diol and isophorone diisocyanate is 1:0.9.

[0038] In a round-bottom flask containing xylene, polycarbonate diol and phosphobutyl succinic acid were weighed in a mass ratio of xylene to polycarbonate diol of 1:5. A 1% by mass dilute sulfuric acid solution was added to the flask in an amount of 0.5% by mass of the polycarbonate diol. The flask containing the reaction mixture was placed in a heating mantle, the temperature was set to 120°C, and a magnetic stirrer was turned on. After reacting for 2 hours, heating was stopped and the reaction mixture was allowed to cool naturally to room temperature. Triethylamine was added to adjust the pH of the reaction mixture to 8 in an amount of 7% by mass of isophorone diisocyanate. Dibutyltin dilaurate was then added in an amount of 0.03% by mass of isophorone diisocyanate. Under nitrogen protection, isophorone diisocyanate was added dropwise. The mixture was reheated to 80°C with continuous stirring. The reaction time was 3 hours to obtain a modified polyurethane resin.

[0039] The modified polyurethane resin, Irganox 1010 antioxidant, Byk-358N leveling agent, Tego Airex 902W defoamer, Tinuvin 328 UV inhibitor and methyl isobutyl ketone were added to a high-speed disperser. After high-speed dispersion at 1500 rpm / min for 20 minutes, the dispersion speed was adjusted to 500 rpm / min, and then silica micropowder, aluminum oxide and sodium molybdate were added. The stirring was continued until they were completely dispersed. Then, 1,6-hexamethylene diisocyanate trimer curing agent was added, and stirring was continued to ensure that all components were fully mixed to obtain a multifunctional repair agent for the surface of power facilities.

[0040] Example 4: A multifunctional repair agent for the surface of power facilities and a preparation method thereof, comprising the following steps:

[0041] Prepare the following components: 34 parts by weight of modified polyurethane resin, 5 parts by weight of hexamethylene diisocyanate trimer curing agent, 12 parts by weight of silica powder, 6 parts by weight of aluminum oxide, 2 parts by weight of sodium molybdate, 0.6 parts by weight of Irganox 1010 antioxidant, 0.5 parts by weight of Byk-358N leveling agent, 0.4 parts by weight of Tego Airex 902W defoaming agent, 1 part by weight of Tinuvin 328 UV inhibitor, and 12 parts by weight of methyl isobutyl ketone;

[0042] The modified polyurethane resin is prepared by mixing phosphobutyric acid and polyurethane resin in a molar ratio of 1:15; the molar ratio of phosphobutyric acid and polycarbonate diol is 1:7; and the molar ratio of polycarbonate diol and isophorone diisocyanate is 1:0.9.

[0043] In a round-bottom flask containing xylene, polycarbonate diol and phosphobutyl succinic acid were weighed in a mass ratio of xylene to polycarbonate diol of 1:5. A 1% by mass dilute sulfuric acid solution was added to the flask in an amount of 0.5% by mass of the polycarbonate diol. The flask containing the reaction mixture was placed in a heating mantle, the temperature was set to 120°C, and a magnetic stirrer was turned on. After reacting for 2 hours, heating was stopped and the reaction mixture was allowed to cool naturally to room temperature. Triethylamine was added to adjust the pH of the reaction mixture to 8 in an amount of 7% by mass of isophorone diisocyanate. Dibutyltin dilaurate was then added in an amount of 0.03% by mass of isophorone diisocyanate. Under nitrogen protection, isophorone diisocyanate was added dropwise. The mixture was reheated to 80°C with continuous stirring. The reaction time was 3 hours to obtain a modified polyurethane resin.

[0044] The modified polyurethane resin, Irganox 1010 antioxidant, Byk-358N leveling agent, Tego Airex 902W defoamer, Tinuvin 328 UV inhibitor and methyl isobutyl ketone were added to a high-speed disperser. After high-speed dispersion at 1500 rpm / min for 20 minutes, the dispersion speed was adjusted to 500 rpm / min, and then silica micropowder, aluminum oxide and sodium molybdate were added. The stirring was continued until they were completely dispersed. Then, 1,6-hexamethylene diisocyanate trimer curing agent was added, and stirring was continued to ensure that all components were fully mixed to obtain a multifunctional repair agent for the surface of power facilities.

[0045] Example 5: A multifunctional repair agent for the surface of power facilities and a preparation method thereof, comprising the following steps:

[0046] Prepare the following components: 22 parts by weight of modified polyurethane resin, 13 parts by weight of hexamethylene diisocyanate trimer curing agent, 18 parts by weight of silica powder, 9 parts by weight of aluminum oxide, 5 parts by weight of sodium molybdate, 0.8 parts by weight of Irganox 1010 antioxidant, 1 part by weight of Byk-358N leveling agent, 0.7 parts by weight of Tego Airex 902W defoaming agent, 3 parts by weight of Tinuvin 328 UV inhibitor, and 18 parts by weight of methyl isobutyl ketone;

[0047] The modified polyurethane resin is prepared by mixing phosphobutyric acid and polyurethane resin in a molar ratio of 1:15; the molar ratio of phosphobutyric acid and polycarbonate diol is 1:7; and the molar ratio of polycarbonate diol and isophorone diisocyanate is 1:0.9.

[0048] In a round-bottom flask containing xylene, polycarbonate diol and phosphobutyl succinic acid were weighed in a mass ratio of xylene to polycarbonate diol of 1:5. A 1% by mass dilute sulfuric acid solution was added to the flask in an amount of 0.5% by mass of the polycarbonate diol. The flask containing the reaction mixture was placed in a heating mantle, the temperature was set to 120°C, and a magnetic stirrer was turned on. After reacting for 2 hours, heating was stopped and the reaction mixture was allowed to cool naturally to room temperature. Triethylamine was added to adjust the pH of the reaction mixture to 8 in an amount of 7% by mass of isophorone diisocyanate. Dibutyltin dilaurate was then added in an amount of 0.03% by mass of isophorone diisocyanate. Under nitrogen protection, isophorone diisocyanate was added dropwise. The mixture was reheated to 80°C with continuous stirring. The reaction time was 3 hours to obtain a modified polyurethane resin.

[0049] The modified polyurethane resin, Irganox 1010 antioxidant, Byk-358N leveling agent, Tego Airex 902W defoamer, Tinuvin 328 UV inhibitor and methyl isobutyl ketone were added to a high-speed disperser. After high-speed dispersion at 1500 rpm / min for 20 minutes, the dispersion speed was adjusted to 500 rpm / min, and then silica micropowder, aluminum oxide and sodium molybdate were added. The stirring was continued until they were completely dispersed. Then, 1,6-hexamethylene diisocyanate trimer curing agent was added, and stirring was continued to ensure that all components were fully mixed to obtain a multifunctional repair agent for the surface of power facilities.

[0050] Example 6: A multifunctional repair agent for the surface of power facilities and a preparation method thereof, comprising the following steps:

[0051] Prepare the following components: 27 parts by weight of modified polyurethane resin, 13 parts by weight of hexamethylene diisocyanate trimer curing agent, 18 parts by weight of silica powder, 9 parts by weight of aluminum oxide, 5 parts by weight of sodium molybdate, 0.8 parts by weight of Irganox 1010 antioxidant, 1 part by weight of Byk-358N leveling agent, 0.7 parts by weight of Tego Airex 902W defoaming agent, 3 parts by weight of Tinuvin 328 UV inhibitor, and 18 parts by weight of methyl isobutyl ketone;

[0052] The modified polyurethane resin is prepared by mixing phosphobutyric acid and polyurethane resin in a molar ratio of 1:15; the molar ratio of phosphobutyric acid and polycarbonate diol is 1:7; and the molar ratio of polycarbonate diol and isophorone diisocyanate is 1:0.9.

[0053] In a round-bottom flask containing xylene, polycarbonate diol and phosphobutyl succinic acid were weighed in a mass ratio of xylene to polycarbonate diol of 1:5. A 1% by mass dilute sulfuric acid solution was added to the flask in an amount of 0.5% by mass of the polycarbonate diol. The flask containing the reaction mixture was placed in a heating mantle, the temperature was set to 120°C, and a magnetic stirrer was turned on. After reacting for 2 hours, heating was stopped and the reaction mixture was allowed to cool naturally to room temperature. Triethylamine was added to adjust the pH of the reaction mixture to 8 in an amount of 7% by mass of isophorone diisocyanate. Dibutyltin dilaurate was then added in an amount of 0.03% by mass of isophorone diisocyanate. Under nitrogen protection, isophorone diisocyanate was added dropwise. The mixture was reheated to 80°C with continuous stirring. The reaction time was 3 hours to obtain a modified polyurethane resin.

[0054] The modified polyurethane resin, Irganox 1010 antioxidant, Byk-358N leveling agent, Tego Airex 902W defoamer, Tinuvin 328 UV inhibitor and methyl isobutyl ketone were added to a high-speed disperser. After high-speed dispersion at 1500 rpm / min for 20 minutes, the dispersion speed was adjusted to 500 rpm / min, and then silica micropowder, aluminum oxide and sodium molybdate were added. The stirring was continued until they were completely dispersed. Then, 1,6-hexamethylene diisocyanate trimer curing agent was added, and stirring was continued to ensure that all components were fully mixed to obtain a multifunctional repair agent for the surface of power facilities.

[0055] Comparative Example 1: The method of Example 3 was used to prepare a modified polyurethane resin by mixing phosphobutyric acid and polyurethane resin in a molar ratio of 1:30.

[0056] Comparative Example 2: The method of Example 3 was adopted, but unmodified polyurethane resin was used, ie, no modification with phospho-succinic acid was used.

[0057] The present invention is a multifunctional repair agent for the surface of electric power facilities prepared by using modified polyurethane resin. The performance index inspection items and inspection standards of the multifunctional repair agent for the surface of electric power facilities are as follows:

[0058] According to the standard GB / T 18380.33-2008 "Combustion Tests for Electrical Cables and Optical Cables under Flame Conditions", the flame propagation performance of cables or optical cables installed in bundles under fire conditions is evaluated, that is, the maximum carbonization range is tested through the bundled cable combustion test (Class A). The maximum carbonization range refers to the maximum length of the carbonized area measured along the cable direction starting from the ignition point during the test. This length reflects the extent of flame spread on the cable and can be used to evaluate the flame propagation performance and flame retardant effect of cables coated with multifunctional surface repair agents for power facilities in fire, thereby characterizing the flame retardant effect of multifunctional surface repair agents for power facilities.

[0059] According to the test scheme of GB / T30693-2014 "Measurement of the contact angle of plastic film with water", the static contact angle of water is tested. The contact angle is an important parameter for measuring the wettability of the material surface. It refers to the angle between the edge of the droplet formed by the liquid drop on the solid surface and the solid surface. The larger the contact angle, the stronger the hydrophobicity of the surface; the smaller the contact angle, the stronger the hydrophilicity of the surface. Therefore, it is used to characterize the waterproof performance of the multifunctional repair agent for the surface of power facilities.

[0060] According to GB / T10125-2012 "Artificial Atmosphere Corrosion Test Salt Spray Test", it is used to test the salt spray corrosion resistance of the multifunctional repair agent on the surface of power facilities. The salt spray test is to spray a certain concentration of salt water solution in a closed test chamber to form a salt spray environment, simulate the corrosion conditions in the ocean or industrial atmosphere, evaluate the corrosion resistance of the sample, and evaluate its corrosion resistance by observing and measuring the degree of corrosion of the sample in the salt spray environment. A 5% sodium chloride solution is used, the pH value is controlled between 6.5 and 7.2, the temperature in the test chamber is controlled at 35±2℃, the relative humidity is controlled at more than 95%, and the test cycle is 2000h. According to the degree of corrosion of the sample, the surface changes of the sample are observed. Therefore, it is used to characterize the corrosion resistance of the multifunctional repair agent on the surface of power facilities.

[0061] According to GB / T 1408.1-2016 "Test Method for Electric Strength of Solid Insulating Materials", the purpose is to standardize the test method for electric strength of solid insulating materials under power frequency voltage. This standard is used to evaluate the insulation performance of solid insulating materials in electrical equipment to ensure their safety and reliability in actual use. The electric strength test is to measure the electrical strength of the insulating material by applying a gradually increasing voltage between two electrodes until the material breaks down. That is, the electric strength refers to the maximum voltage that the material can withstand per unit thickness. The electric strength = breakdown voltage / sample thickness, the unit is kV / mm, so it is used to characterize the insulation performance of the multifunctional surface repair agent of power facilities.

[0062] According to GB / T 1410-2006 "Test Method for Volume Resistivity and Surface Resistivity of Solid Insulating Materials", the purpose is to standardize the measurement method of volume resistivity and surface resistivity of solid insulating materials. It is an important indicator for evaluating the electrical properties of insulating materials. Volume resistivity refers to the resistance per unit volume inside the material, reflecting the conductivity of the material. For insulating materials, the larger the volume resistivity, the better the insulation performance. Therefore, it is used to characterize the insulation performance of multifunctional surface repair agents for power facilities.

[0063] The multifunctional repair agents for the surfaces of power facilities prepared in Examples 1-6 and Comparative Examples 1-2 were tested using the above standards, and the obtained data are shown in Table 1:

[0064] Table 1 Performance data of Examples 1-6 and Comparative Examples 1-2

[0065]

[0066] The above data fully demonstrate that compared with Comparative Examples 1-2, Examples 1-6 can fully demonstrate the effect of modified polyurethane resin on the flame retardant, waterproof, corrosion-resistant and insulating properties of the multifunctional repair agent on the surface of power facilities.

[0067] Since the present invention uses modified polyurethane resin to prepare the multifunctional repair agent for the surface of power facilities, the performance of the multifunctional repair agent for the surface of power facilities is effectively improved by modifying the polyurethane resin, as follows:

[0068] It can be seen from Examples 1-3 that as the proportion of components in the modified polyurethane resin continues to increase, the performance of the multifunctional repair agent for the surface of power facilities is significantly improved, indicating that phosphoacrylic acid can effectively improve the binding force of polyurethane resin on the metal surface, and can chelate with the metal through the carboxyl and phosphoryl groups, so that the resin adheres firmly to the metal surface and forms a protective film on the metal surface, thereby enhancing the chemical stability and corrosion resistance of the metal surface. At the same time, combined with the flame retardant effect of the phosphoryl group, the multifunctional repair agent for the surface of power facilities can better play the functions of insulation repair, anti-condensation, anti-icing and radiation cooling.

[0069] It can be seen from Examples 3 and 4 that as the content of other components in the multifunctional surface repair agent for power facilities continues to change, the performance of the multifunctional surface repair agent for power facilities does not change significantly, indicating that the modified polyurethane resin is the key factor determining the performance of the multifunctional surface repair agent for power facilities, and small changes in other components within a certain range are not sufficient to affect the performance of the multifunctional surface repair agent for power facilities.

[0070] It can be seen from Examples 3, 5 and 6 that as the content of the modified polyurethane resin continues to change, the performance of the multifunctional repair agent for the surface of power facilities continues to change, indicating that the modified polyurethane resin ensures the bonding strength of the coating on the metal surface, and also illustrates that the complexation of the carboxyl and phosphoryl groups of phosphobutyric acid with the metal can indeed effectively improve the coating effect of the polyurethane resin on the metal surface. The better the coating effect, the better the stability during long-term operation or extreme weather, and the more sustainable the protection performance, thereby improving the ability of the repair agent to resist extreme weather and fire hazards, and extending the service life of the equipment and lines after spraying.

[0071] According to the above test experiments, the performance of the multifunctional repair agent for the surface of electric power facilities prepared according to Example 3 has the best performance, so Example 3 is regarded as the best example;

[0072] By comparing Example 3 with Comparative Examples 1-2, it can be seen that:

[0073] The modified polyurethane resin in comparative example 1 is modified by mixing phosphobutyric acid and polyurethane resin in a molar ratio of 1:30. The worse the performance of the multifunctional repair agent for the surface of power facilities, the more phosphobutyric acid is introduced into the polyurethane resin, which is equivalent to introducing functional groups on the polyurethane resin that are conducive to forming chemical bonds with the metal surface. However, when the content of phosphobutyric acid is too low, the lower the content of functional groups, the weaker the bonding force formed with the metal surface, and therefore it is not enough to cause a significant improvement in the coating effect, and the performance of the multifunctional repair agent for the surface of power facilities is poor.

[0074] Comparative Example 2 uses unmodified polyurethane resin, that is, it is not modified with phosphobutyric acid. The performance of the multifunctional repair agent for the surface of power facilities is worse, which shows that the carboxyl group and phosphoryl group on the phosphobutyric acid play a chelating role to form an effective protective film, which not only improves the adhesion of the polyurethane resin to the metal, but also improves the chemical stability and corrosion resistance of the metal surface, while providing the flame retardant effect of the phosphoryl group. If the phosphobutyric acid is not used for modification, the binding force between the carboxyl group and the phosphoryl group and the metal is lacking, so the coating effect deteriorates, which in turn leads to the deterioration of the performance of the repair agent.

[0075] In summary, the modified polyurethane resin is prepared by phosphobutyric acid, and the chelation effect of carboxyl and phosphoryl groups on the metal surface is utilized to improve the adhesion of the coating on the metal surface. At the same time, a protective film is formed to enhance the chemical stability and corrosion resistance of the metal surface. In addition, the introduced phosphoryl group also has a flame retardant effect, which can further enhance the flame retardant properties of the resin and improve the service life of the equipment and lines after spraying.

[0076] The basic principles, main features, and advantages of the present invention are shown and described above. It should be understood by those skilled in the art that the present invention is not limited to the above-described embodiments. The above-described embodiments and descriptions are merely preferred examples of the present invention and are not intended to limit the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and modifications fall within the scope of the invention claimed.

Claims

1. A multifunctional repair agent for the surface of power facilities, characterized in that: The invention comprises the following components: 22-34 parts by weight of modified polyurethane resin, 5-13 parts by weight of hexamethylene diisocyanate trimer curing agent, 12-18 parts by weight of silica powder, 6-9 parts by weight of aluminum oxide, 2-5 parts by weight of sodium molybdate, 0.6-0.8 parts by weight of antioxidant, 0.5-1 parts by weight of leveling agent, 0.4-0.7 parts by weight of defoaming agent, 1-3 parts by weight of anti-ultraviolet agent and 12-18 parts by weight of methyl isobutyl ketone; The modified polyurethane resin is prepared by mixing phospho-succinic acid and polyurethane resin in a molar ratio of 1:8-15. The preparation method of the modified polyurethane resin is as follows: In a round-bottom flask filled with xylene, polycarbonate diol and phosphobutyl succinic acid were weighed, and a dilute sulfuric acid solution was added to the flask. The flask containing the reaction mixture was placed in a heating mantle, the temperature was set to 110-120°C, and a magnetic stirrer was turned on. After the reaction had continued for 1-2 hours, heating was stopped and the reaction mixture was allowed to cool naturally to room temperature. Triethylamine was added to adjust the pH of the reaction mixture, and dibutyltin dilaurate was added. Under nitrogen protection, isophorone diisocyanate was added dropwise. The mixture was reheated to 80-100°C with continuous stirring. The reaction time was 2-4 hours to obtain a modified polyurethane resin.

2. The multifunctional repair agent for the surface of electric power facilities according to claim 1, characterized in that: The molar ratio of the phospho-succinic acid to the polycarbonate diol is 1:5-7.

3. The multifunctional repair agent for the surface of electric power facilities according to claim 1, characterized in that: The molar ratio of the polycarbonate diol to isophorone diisocyanate is 1:0.7-0.

9.

4. The multifunctional repair agent for the surface of electric power facilities according to claim 1, characterized in that: The mass fraction of the dilute sulfuric acid solution is 1-5%, and the added amount is 0.1-0.5% of the mass of the polycarbonate diol.

5. The multifunctional repair agent for the surface of electric power facilities according to claim 1, characterized in that: The dibutyltin dilaurate is 0.01-0.05% of the mass of isophorone diisocyanate.

6. The multifunctional repair agent for the surface of electric power facilities according to claim 1, characterized in that: The mass ratio of the xylene to the polycarbonate diol is 1:3-5.

7. The multifunctional repair agent for the surface of electric power facilities according to claim 1, characterized in that: The amount of triethylamine added is 6-8% of the mass of isophorone diisocyanate, and the pH of the reaction mixture is adjusted to 7-9.

8. A method for preparing a multifunctional repair agent for the surface of a power facility, for preparing the multifunctional repair agent for the surface of a power facility according to any one of claims 1 to 7, characterized in that: The steps include: The modified polyurethane resin, antioxidant, leveling agent, defoaming agent, UV inhibitor and methyl isobutyl ketone are added to a high-speed disperser. After high-speed dispersion for 15-20 minutes, the dispersion speed is adjusted to low-speed stirring, and then silicon micropowder, aluminum oxide and sodium molybdate are added. The stirring is continued until they are completely dispersed. Then, 1,6-hexamethylene diisocyanate trimer curing agent is added, and stirring is continued to ensure that all components are fully mixed to obtain a multifunctional repair agent for the surface of power facilities.

9. The method for preparing a multifunctional repair agent for the surface of electric power facilities according to claim 8, characterized in that: The high-speed dispersion speed is 1200-1500 rpm, and the low-speed dispersion speed is 300-500 rpm.

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