Polyurethane electric anticorrosive material and preparation method thereof

Abstract

The invention provides a polyurethane electric anticorrosive material. The polyurethane electric anticorrosive material comprises the following raw materials in parts by mass: 50-70 parts of organosilicon modified polyurethane, 15-25 parts of epoxy resin, 5-15 parts of a nonionic polyurethane surfactant, 1-5 parts of a rust layer penetrant, 5-15 parts of a rust layer conversion agent and 1-5 parts of a coalescing agent. The polyurethane electric anti-corrosion material has excellent corrosion resistance and is suitable for electric corrosion prevention. Meanwhile, the invention also provides a preparation method of the polyurethane electric anticorrosive material.

Description

Technical Field

[0001] The invention relates to an anti-corrosion material, in particular to a polyurethane electric power anti-corrosion material and a preparation method thereof, which are used in the electric power anti-corrosion process. Background Art

[0002] In recent years, my country's power system has developed rapidly, the total amount of power equipment has continued to increase, and the operating status of power equipment has become increasingly important for the safe and stable operation of the power system. Among power equipment, outdoor power equipment, which occupies an important position, is easily affected by the atmospheric environment due to its outdoor installation and open-air operation. The erosion and damage of specific harsh environments such as humidity and acid rain will cause corrosion of outdoor power equipment, resulting in damage to the structure of power equipment and reduced lifespan. In severe cases, it may even affect the operating status of power equipment and cause failures, posing a huge threat to the power system.

[0003] Therefore, in order to ensure the smooth operation of the power system, outdoor power equipment must be well protected from corrosion. The corrosion of outdoor power equipment mainly includes atmospheric corrosion, water corrosion and soil corrosion. Among them, the corrosion of wires, hardware and pole tower structures is generally atmospheric corrosion, and the corrosion of pole tower foundations and grounding grids is mostly soil corrosion. In terms of basic principles, corrosion prevention and control measures mainly include chemical plating, electrolytic plating, plastic lining, rubber lining, anti-corrosion coating, heavy anti-corrosion coating, cathodic protection and anodic protection. In the anti-corrosion technology of steel structures in power transmission and transformation projects, the surface metal protective layer anti-corrosion method is generally used. This method uses anti-corrosion metal as a protective layer. It is to cover the surface of the steel substrate with a layer of metal elements that are more active than iron as an anodic layer. The metal layer usually used for the protective layer is zinc. The commonly used anti-corrosion technology for outdoor power equipment is hot-dip galvanizing technology. However, hot-dip galvanizing technology has the following shortcomings: 1) The existing galvanizing technology is generally backward, the process automation level is low, the galvanizing quality is unstable, and the energy consumption is high; 2) The hot-dip galvanizing anti-corrosion technology and its process are backward, the coating has poor corrosion resistance and short service life, especially in the coastal salt spray corrosion environment, the corrosion resistance life is short, the subsequent maintenance workload of workers is increased, and the operating cost is high; 3) The thickness index of the hot-dip galvanized zinc layer does not meet the requirements. The anti-corrosion coating has the characteristics of easy use, excellent performance and durability, easy maintenance and re-coating, and a wide range of applications. It can meet the needs of equipment with complex configurations, and its colors are diverse, which can play a decorative and iconic role at the same time, so it is most suitable for the anti-corrosion requirements of outdoor power equipment.

[0004] At present, from a global perspective, anti-corrosion coatings have been used in some power transmission and transformation equipment. The materials used are mostly limited to anti-corrosion coatings such as unsaturated resins, phenolic resins, and alkyd resins. However, due to the lack of systematic and in-depth research on the corrosion mechanism under different transmission line environmental conditions, it cannot provide ideal protection for power transmission and transformation equipment (especially line equipment that works in various environments for a long time). Compared with other industries, the anti-corrosion coating of power transmission and transformation equipment is under the action of electric fields for a long time, which leads to the enhanced destructive ability of environmental corrosive media. At the same time, the polymer compound film-forming substances that serve as the base material of the coating will accelerate aging due to the action of the electric field. It can be seen that the special working environment of power transmission and transformation equipment puts higher requirements on anti-corrosion coatings.

[0005] In recent years, polyurethane coatings have been widely used in anti-corrosion material research due to their significant advantages such as good adhesion, high coating hardness, strong corrosion resistance, and good chemical stability. The lower price of this material than traditional fluorine-containing materials has also created a broad application space for it. However, the large amount of harmful substances volatilized during the use of traditional polyurethane coatings has become a decisive factor limiting its application. Based on this, researchers have developed water-based polyurethane coatings with low harmful substance volatilization based on traditional polyurethane coatings. However, considering the difference in resistance between water-based polyurethane coatings and solvent-based polyurethane coatings, it is necessary to modify water-based polyurethanes to improve the disadvantages of water-based polyurethanes and enhance their anti-corrosion properties, so as to achieve anti-corrosion materials that are both environmentally friendly and have high anti-corrosion properties. Summary of the invention

[0006] The purpose of the present invention is to provide a polyurethane electric power anti-corrosion material and a preparation method thereof in view of the deficiencies in the prior art.

[0007] In order to achieve the above object, the technical solution adopted by the present invention is:

[0008] A polyurethane electric power anticorrosion material comprises the following raw materials in parts by mass: 50-70 parts of organosilicon-modified polyurethane, 15-25 parts of epoxy resin, 5-15 parts of nonionic polyurethane surfactant, 1-5 parts of rust layer penetrant, 5-15 parts of rust layer converter and 1-5 parts of film-forming aid.

[0009] The raw materials of the silicone-modified polyurethane include toluene diisocyanate, polyether diol, catalyst, stabilizer and dimethyl silicone oil; wherein n(NCO) / n(OH)=1:(1.05-1.13), the amount of dimethyl silicone oil is 1%-4% of the sum of the mass of toluene diisocyanate and polyether diol, the amount of catalyst is 0.05%-1% of the sum of the mass of toluene diisocyanate and polyether diol; the amount of stabilizer is 0.01%-0.1% of the sum of the mass of toluene diisocyanate and polyether diol.

[0010] The raw materials of the nonionic polyurethane surfactant include isophorone diisocyanate, polytetramethylene ether glycol, a catalyst, castor oil and acetone; wherein n(NCO) / n(OH)=(1.01-1.07):1, n(castor oil) / n(OH)=1:(0.9-1.2), and the amount of the catalyst used is 0.05%-1% of the sum of the mass of toluene diisocyanate and polyether glycol.

[0011] The catalyst is one of dibutyltin dilaurate, stannous octoate, stannous isooctanoate, and stannous 2-ethylhexanoate, or a combination of at least two of them.

[0012] The stabilizer is one or a combination of at least two of benzoyl chloride, polyphosphoric acid, environmentally friendly inhibitor NCAT-YC01, methyl p-toluenesulfonate, and dimethyl sulfate.

[0013] A method for preparing a polyurethane electric power anti-corrosion material comprises the following steps:

[0014] The organosilicon modified polyurethane, epoxy resin, rust layer penetrant, rust layer converter and film-forming aid are mixed evenly, and then a non-ionic polyurethane surfactant is added and mixed evenly to obtain a polyurethane electric power anti-corrosion material.

[0015] The preparation method of organosilicon-modified polyurethane comprises the following steps: adding polyether diol, dimethyl silicone oil and solvent into a reaction container, introducing nitrogen, heating to 70-90°C while stirring, adding a catalyst, a stabilizer and toluene diisocyanate, reacting until -NCO disappears in the system, removing the solvent and unreacted raw materials by reduced pressure distillation, adding deionized water, mixing evenly, and obtaining organosilicon-modified polyurethane.

[0016] The preparation method of a nonionic polyurethane surfactant comprises the following steps: adding polytetramethylene ether glycol, castor oil and acetone into a reaction container, introducing nitrogen, heating to 70-90°C while stirring, adding a catalyst and isophorone diisocyanate, reacting for 1-4 hours, and removing the solvent by reduced pressure distillation to obtain a nonionic polyurethane surfactant.

[0017] The present invention has outstanding substantial features and significant progress compared to the prior art. Specifically, the present invention provides a polyurethane electric power anti-corrosion material. By combining silicone-modified polyurethane, epoxy resin, 5-15 parts of non-ionic polyurethane surfactant, rust layer penetrant and rust layer converter, the coating formed has excellent corrosion resistance and can be used as an electric power anti-corrosion coating in the field of anti-corrosion of electric power equipment. DETAILED DESCRIPTION

[0018] The technical solution of the present invention is further described in detail below through specific implementation methods.

[0019] A polyurethane electric power anticorrosion material comprises the following raw materials in parts by mass: 50-70 parts of organosilicon-modified polyurethane, 15-25 parts of epoxy resin, 5-15 parts of nonionic polyurethane surfactant, 1-5 parts of rust layer penetrant, 5-15 parts of rust layer converter and 1-5 parts of film-forming aid.

[0020] The raw materials of the silicone-modified polyurethane include toluene diisocyanate, polyether diol, catalyst, stabilizer and dimethyl silicone oil; wherein n(NCO) / n(OH)=1:(1.05-1.13), the amount of dimethyl silicone oil is 1%-4% of the sum of the mass of toluene diisocyanate and polyether diol, the amount of catalyst is 0.05%-1% of the sum of the mass of toluene diisocyanate and polyether diol; the amount of stabilizer is 0.01%-0.1% of the sum of the mass of toluene diisocyanate and polyether diol.

[0021] The raw materials of the nonionic polyurethane surfactant include isophorone diisocyanate, polytetramethylene ether glycol, a catalyst, castor oil and acetone; wherein n(NCO) / n(OH)=(1.01-1.07):1, n(castor oil) / n(OH)=1:(0.9-1.2), and the amount of the catalyst used is 0.05%-1% of the sum of the mass of toluene diisocyanate and polyether glycol.

[0022] The catalyst is one of dibutyltin dilaurate, stannous octoate, stannous isooctanoate, and stannous 2-ethylhexanoate, or a combination of at least two thereof. The stabilizer is one of benzoyl chloride, polyphosphoric acid, environmentally friendly inhibitor NCAT-YC01, methyl p-toluenesulfonate, and dimethyl sulfate, or a combination of at least two thereof.

[0023] A method for preparing a polyurethane electric power anti-corrosion material comprises the following steps:

[0024] The organosilicon modified polyurethane, epoxy resin, rust layer penetrant, rust layer converter and film-forming aid are mixed evenly, and then a non-ionic polyurethane surfactant is added and mixed evenly to obtain a polyurethane electric power anti-corrosion material.

[0025] The preparation method of organosilicon-modified polyurethane comprises the following steps: adding polyether diol, dimethyl silicone oil and solvent into a reaction container, introducing nitrogen, heating to 70-90°C while stirring, adding a catalyst, a stabilizer and toluene diisocyanate, reacting until -NCO disappears in the system, removing the solvent and unreacted raw materials by reduced pressure distillation, adding deionized water, mixing evenly, and obtaining organosilicon-modified polyurethane with a solid content of 15%-25%.

[0026] The preparation method of a nonionic polyurethane surfactant comprises the following steps: adding polytetramethylene ether glycol, castor oil and acetone into a reaction container, introducing nitrogen, heating to 70-90°C while stirring, adding a catalyst and isophorone diisocyanate, reacting for 1-4 hours, and removing the solvent by reduced pressure distillation to obtain a nonionic polyurethane surfactant.

[0027] The corrosion protection performance of the silicone-based modified polyurethane anti-corrosion coating was evaluated by electrochemical impedance spectroscopy (EIS) using an electrochemical workstation and a salt spray corrosion test chamber. The electrochemical test was carried out in a 3.5wt.% NaCl solution at room temperature. The polarization curve was measured using an electrochemical workstation. The workstation provided three electrodes, including a saturated calomel electrode as a reference electrode, metal platinum as a counter electrode, and a metal sample coated with polyurethane electrical anti-corrosion material (about 30μm) as a working electrode. The test frequency was 100kH-10mHz, the amplitude was 20mV, the scanning rate was 1mV / s, and the Tafel linear extrapolation method was used to fit the corrosion current density and corrosion potential of the sample.

[0028] Example 1

[0029] A polyurethane electric power anti-corrosion material comprises the following raw materials in parts by mass: 50 parts of organosilicon-modified polyurethane, 25 parts of epoxy resin, 5 parts of non-ionic polyurethane surfactant, 1 part of rust layer penetrant, 5 parts of rust layer converter and 1 part of film-forming aid.

[0030] The raw materials of silicone-modified polyurethane include toluene diisocyanate, polyether diol, catalyst, stabilizer and dimethyl silicone oil; wherein n(NCO) / n(OH)=1:1.13, the amount of dimethyl silicone oil is 3% of the sum of the mass of toluene diisocyanate and polyether diol, the amount of catalyst is 0.1% of the sum of the mass of toluene diisocyanate and polyether diol; the amount of stabilizer is 0.01% of the sum of the mass of toluene diisocyanate and polyether diol.

[0031] The raw materials of the non-ionic polyurethane surfactant include isophorone diisocyanate, polytetramethylene ether glycol, a catalyst, castor oil and acetone; wherein n(NCO) / n(OH)=1.07:1, n(castor oil) / n(OH)=1:, and the amount of the catalyst is 0.1% of the sum of the mass of toluene diisocyanate and polyether diol.

[0032] The film-forming aid is environmentally friendly film-forming aid DN-12; the catalyst is 1:1 dibutyltin dilaurate and stannous octoate. The stabilizer is polyphosphoric acid.

[0033] A method for preparing a polyurethane electric power anti-corrosion material comprises the following steps:

[0034] The preparation method of organosilicon-modified polyurethane comprises the following steps: adding polyether diol, dimethyl silicone oil and solvent into a reaction container, introducing nitrogen, heating to 80°C while stirring, adding a catalyst, a stabilizer and toluene diisocyanate, reacting until -NCO disappears in the system, removing the solvent and unreacted raw materials by reduced pressure distillation, adding deionized water, mixing evenly, and obtaining organosilicon-modified polyurethane with a solid content of 16.8%.

[0035] The preparation method of a nonionic polyurethane surfactant comprises the following steps: adding polytetramethylene ether glycol, castor oil and acetone into a reaction container, introducing nitrogen, heating to 90°C while stirring, adding a catalyst and isophorone diisocyanate, reacting for 12 hours, and removing the solvent by reduced pressure distillation to obtain a nonionic polyurethane surfactant.

[0036] The organosilicon modified polyurethane, epoxy resin, rust layer penetrant, rust layer converter and film-forming agent were mixed evenly, and then non-ionic polyurethane surfactant was added and mixed evenly to obtain polyurethane power anti-corrosion material. After testing, the self-corrosion point of the anti-corrosion material was -1.138V, and the self-corrosion current density was 2.415×10 -6 A / cm -2 .

[0037] Example 2

[0038] A polyurethane electric power anti-corrosion material comprises the following raw materials in parts by mass: 70 parts of organosilicon-modified polyurethane, 15 parts of epoxy resin, 15 parts of non-ionic polyurethane surfactant, 5 parts of rust layer penetrant, 15 parts of rust layer converter and 5 parts of film-forming aid.

[0039] The raw materials of silicone-modified polyurethane include toluene diisocyanate, polyether diol, catalyst, stabilizer and dimethyl silicone oil; wherein n(NCO) / n(OH)=1:1.05, the amount of dimethyl silicone oil is 3% of the sum of the mass of toluene diisocyanate and polyether diol, the amount of catalyst is 0.1% of the sum of the mass of toluene diisocyanate and polyether diol; the amount of stabilizer is 0.01% of the sum of the mass of toluene diisocyanate and polyether diol.

[0040] The raw materials of the non-ionic polyurethane surfactant include isophorone diisocyanate, polytetramethylene ether glycol, a catalyst, castor oil and acetone; wherein n(NCO) / n(OH)=1.07:1, n(castor oil) / n(OH)=1:1.2, and the amount of the catalyst is 0.1% of the sum of the mass of toluene diisocyanate and polyether diol.

[0041] The film-forming aid is environmentally friendly film-forming aid DN-12; the catalyst is 1:1 dibutyltin dilaurate and stannous octoate. The stabilizer is polyphosphoric acid.

[0042] A method for preparing a polyurethane electric power anti-corrosion material comprises the following steps:

[0043] The preparation method of organosilicon-modified polyurethane comprises the following steps: adding polyether diol, dimethyl silicone oil and solvent into a reaction container, introducing nitrogen, heating to 80°C while stirring, adding a catalyst, a stabilizer and toluene diisocyanate, reacting until -NCO disappears in the system, removing the solvent and unreacted raw materials by reduced pressure distillation, adding deionized water, mixing evenly, and obtaining organosilicon-modified polyurethane with a solid content of 15.3%.

[0044] The preparation method of a nonionic polyurethane surfactant comprises the following steps: adding polytetramethylene ether glycol, castor oil and acetone into a reaction container, introducing nitrogen, heating to 70°C while stirring, adding a catalyst and isophorone diisocyanate, reacting for 4 hours, and removing the solvent by reduced pressure distillation to obtain a nonionic polyurethane surfactant.

[0045] The organosilicon modified polyurethane, epoxy resin, rust layer penetrant, rust layer converter and film-forming aid were mixed evenly, and then non-ionic polyurethane surfactant was added and mixed evenly to obtain polyurethane power anti-corrosion material. After testing, the self-corrosion point of the anti-corrosion material was -1.132V, and the self-corrosion current density was 2.360×10 -6 A / cm -2 .

[0046] Example 3

[0047] A polyurethane electric power anti-corrosion material comprises the following raw materials in parts by mass: 60 parts of organosilicon-modified polyurethane, 20 parts of epoxy resin, 10 parts of non-ionic polyurethane surfactant, 3 parts of rust layer penetrant, 10 parts of rust layer converter and 2 parts of film-forming aid.

[0048] The raw materials of silicone-modified polyurethane include toluene diisocyanate, polyether diol, catalyst, stabilizer and dimethyl silicone oil; wherein n(NCO) / n(OH)=1:1.1, the amount of dimethyl silicone oil is 4% of the sum of the mass of toluene diisocyanate and polyether diol, the amount of catalyst is 0.1% of the sum of the mass of toluene diisocyanate and polyether diol; the amount of stabilizer is 0.01% of the sum of the mass of toluene diisocyanate and polyether diol.

[0049] The raw materials of the non-ionic polyurethane surfactant include isophorone diisocyanate, polytetramethylene ether glycol, a catalyst, castor oil and acetone; wherein n(NCO) / n(OH)=1.03:1, n(castor oil) / n(OH)=1:0.9, and the amount of the catalyst is 0.1% of the sum of the mass of toluene diisocyanate and polyether glycol.

[0050] The film-forming aid is environmentally friendly film-forming aid DN-12; the catalyst is 1:1 dibutyltin dilaurate and stannous octoate. The stabilizer is 1:1 polyphosphoric acid and benzoyl chloride.

[0051] A method for preparing a polyurethane electric power anti-corrosion material comprises the following steps:

[0052] The preparation method of organosilicon-modified polyurethane comprises the following steps: adding polyether diol, dimethyl silicone oil and solvent into a reaction container, introducing nitrogen, heating to 80°C while stirring, adding a catalyst, a stabilizer and toluene diisocyanate, reacting until -NCO disappears in the system (the end point is determined by titration with n-butylamine), removing the solvent and unreacted raw materials by reduced pressure distillation, adding deionized water, mixing evenly, and obtaining organosilicon-modified polyurethane with a solid content of 18.2%.

[0053] The preparation method of a nonionic polyurethane surfactant comprises the following steps: adding polytetramethylene ether glycol, castor oil and acetone into a reaction container, introducing nitrogen, heating to 90°C while stirring, adding a catalyst and isophorone diisocyanate, reacting for 2 hours, and removing the solvent by reduced pressure distillation to obtain a nonionic polyurethane surfactant.

[0054] The organosilicon modified polyurethane, epoxy resin, rust layer penetrant, rust layer converter and film-forming aid were mixed evenly, and then non-ionic polyurethane surfactant was added and mixed evenly to obtain polyurethane power anti-corrosion material. After testing, the self-corrosion point of the anti-corrosion material was -1.121V, and the self-corrosion current density was 2.254×10 -6 A / cm -2 .

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the present invention, which should be included in the scope of the technical solution for protection of the present invention.

Claims

1. A polyurethane electric power anti-corrosion material, comprising the following raw materials in parts by mass: 50-70 parts of organosilicon-modified polyurethane, 15-25 parts of epoxy resin, 5-15 parts of non-ionic polyurethane surfactant, 1-5 parts of rust layer penetrant, 5-15 parts of rust layer converter and 1-5 parts of film-forming aid.

2. The polyurethane electric power anti-corrosion material according to claim 1, characterized in that: The raw materials of silicone-modified polyurethane include toluene diisocyanate, polyether diol, catalyst, stabilizer and dimethyl silicone oil; among them, n(NCO) / n(OH)=1:(1.05-1.13), the amount of dimethyl silicone oil is 1%-4% of the sum of the mass of toluene diisocyanate and polyether diol, the amount of catalyst is 0.05%-1% of the sum of the mass of toluene diisocyanate and polyether diol; the amount of stabilizer is 0.01%-0.1% of the sum of the mass of toluene diisocyanate and polyether diol.

3. The polyurethane electric power anti-corrosion material according to claim 2, characterized in that: The raw materials of the non-ionic polyurethane surfactant include isophorone diisocyanate, polytetramethylene ether glycol, a catalyst, castor oil and acetone; wherein n(NCO) / n(OH)= (1.01-1.07):1, n(castor oil) / n(OH)=1:(0.9-1.2), and the amount of the catalyst used is 0.05%-1% of the sum of the mass of toluene diisocyanate and polyether diol.

4. The polyurethane electric power anti-corrosion material according to claim 4, characterized in that: The catalyst is one of dibutyltin dilaurate, stannous octoate, stannous isooctanoate, and stannous 2-ethylhexanoate, or a combination of at least two of them.

5. The polyurethane electric power anti-corrosion material according to claim 5, characterized in that: The stabilizer is one or a combination of at least two of benzoyl chloride, polyphosphoric acid, environmentally friendly inhibitor NCAT-YC01, methyl p-toluenesulfonate, and dimethyl sulfate.

6. A method for preparing the polyurethane electric power anticorrosion material according to any one of claims 1 to 5, comprising the following steps: The organosilicon modified polyurethane, epoxy resin, rust layer penetrant, rust layer converter and film-forming aid are mixed evenly, and then a non-ionic polyurethane surfactant is added and mixed evenly to obtain a polyurethane electric power anti-corrosion material.

7. The preparation method according to claim 6, characterized in that: The preparation method of organosilicon-modified polyurethane comprises the following steps: adding polyether diol, dimethyl silicone oil and solvent into a reaction container, introducing nitrogen, heating to 70-90°C while stirring, adding a catalyst, a stabilizer and toluene diisocyanate, reacting until -NCO disappears in the system, removing the solvent and unreacted raw materials by reduced pressure distillation, adding deionized water, mixing evenly, and obtaining organosilicon-modified polyurethane.

8. The preparation method according to claim 7, characterized in that: The preparation method of a nonionic polyurethane surfactant comprises the following steps: adding polytetramethylene ether glycol, castor oil and acetone into a reaction container, introducing nitrogen, heating to 70-90°C while stirring, adding a catalyst and isophorone diisocyanate, reacting for 1-4 hours, and removing the solvent by reduced pressure distillation to obtain a nonionic polyurethane surfactant.