CN115109491A

CN115109491A - Anticorrosive paint for electric power iron tower and preparation method thereof

Info

Publication number: CN115109491A
Application number: CN202210819849.6A
Authority: CN
Inventors: 李青
Original assignee: Hunan Zhongkezhiwang Power Technology Co ltd
Current assignee: Hunan Zhongkezhiwang Power Technology Co ltd
Priority date: 2022-07-13
Filing date: 2022-07-13
Publication date: 2022-09-27

Abstract

The application relates to an anticorrosive paint for an electric power iron tower and a preparation method thereof, wherein the anticorrosive paint comprises the following components in parts by mass: epoxy resin: 25-35 parts; polymethyl acrylate: 2-5 parts; modified short carbon fiber: 1-5 parts; polyvinylidene fluoride ethylene: 1-4 parts; anionic polymer: 1-3 parts; curing agent: 5-8 parts; solvent: 8-12 parts of a solvent; auxiliary agent: 3-8 parts. According to the application, the electrochemical corrosion resistance and the acid and alkali corrosion resistance of the coating can be improved from multiple aspects by introducing the modified chopped carbon fibers, the polyvinylidene fluoride and the anionic polymer into the epoxy resin-based coating, so that the comprehensive performance of the coating is integrally improved, and the coating is better applied to corrosion prevention of an electric power iron tower. CM infrared powder and basf 5151 are also introduced into the coating components, the CM infrared powder can radiate heat out of the coating, and the basf 5151 absorbs ultraviolet light, so that the damage of high temperature and ultraviolet light to the coating can be reduced in the aspects of cooling and ultraviolet radiation resistance.

Description

Anticorrosive paint for electric power iron tower and preparation method thereof

Technical Field

The application relates to the technical field of metal anticorrosive coatings, in particular to an iron tower anticorrosive coating for electric power and a preparation method thereof.

Background

The electric power iron tower is used as an important component of the electric transmission line, is an important lifeline project, is different from a common civil engineering structure, and has the most remarkable characteristic that the electric power iron tower is connected with each tower pole by a lead to form a continuous body, and if one of the electric power iron towers is damaged, the whole line is influenced. The electric power iron tower is installed outdoors, and the environment that the wind blows, rain and sun is added makes it be more easily corroded than other power equipment, and after the corruption takes place, can seriously influence the intensity of iron tower, increases dangerously, thereby reduces its service life. The anticorrosive paint is a main measure for corrosion prevention of the existing electric power iron tower.

At present, the types of metal anticorrosive coatings are various, for example, in the publication No. CN 114574081A 'preparation method of a metal surface heavy-duty anticorrosive protective coating' the aliphatic isocyanate and the polyaspartic ester resin are adopted to be cured into a film, so that the weather resistance, the base layer adhesive force, the water resistance, the corrosion resistance and the ultraviolet resistance of the coating can be improved; however, the anti-aging performance and the anti-corrosion performance of the steel are improved from the overall performance, but the performance of the steel is still further improved if the steel is used for an electric power iron tower, and the electrochemical corrosion resistance of the steel is not considered in the patent, so that the steel is not suitable for the corrosion prevention of the electric power iron tower to a great extent. Also as in CN103666148A, "a corrosion and fire resistant metallic paint", the fire resistance of the coating is improved mainly by adding fire retardant to the paint; but the fireproof performance has no great effect on outdoor electric power iron towers. In view of the use environment and the use scene of the electric power iron tower, the applicant believes that the proportion of electrochemical corrosion and acid-base corrosion in the use process of the electric power iron tower is relatively large compared with other use scenes, the acid-base corrosion is mainly outdoor acid rain corrosion, and the relatively high occurrence frequency of the electrochemical corrosion is mainly because the use scene of the electric power iron tower causes weak current to exist on the electric power iron tower frequently. But the current metal coating is not designed for the use scene of the electric power iron tower. Therefore, it is necessary to develop a coating for an electric power iron tower.

Disclosure of Invention

In order to further improve the acid-base corrosion resistance and electrochemical corrosion resistance of the electric power iron tower, the application provides an iron tower anticorrosive coating for electric power and a preparation method thereof.

The application provides an iron tower anticorrosive coating for electric power and a preparation method thereof, and the following technical scheme is adopted:

the first aspect is an anticorrosive coating for an electric power iron tower, which comprises the following raw materials in parts by mass:

epoxy resin: 25-35 parts;

polymethyl acrylate: 2-5 parts;

modified short carbon fiber: 1-5 parts;

polyvinylidene fluoride ethylene: 1-4 parts;

anionic polymer: 1-3 parts;

curing agent: 5-8 parts;

solvent: 8-12 parts of a solvent;

auxiliary agent: 3-8 parts.

By adopting the technical scheme, the epoxy resin is used as the main base material, and the methyl acrylate is added, so that the bonding force with iron metal can be increased mainly due to the combination of the epoxy resin and the methyl acrylate, the adhesion force of the coating can be ensured, and the waterproof property and the heat resistance of the coating are stronger; in order to improve the electrochemical corrosion resistance of the electric power iron tower, modified chopped carbon fiber and anionic polymer are added into the coating; the carbon fiber has better conductivity, and can play a role in drainage under the action of weak current on the electric iron tower, so that the generation of electrochemical corrosion is reduced; when the power iron tower is corroded, iron ions are ionized on the surface of the power iron tower, and the anion polymer can be complexed with the generated iron ions to block a micro-current path so as to play a role in reducing electrochemical corrosion. In order to further improve the hydration resistance of the coating, polyvinylidene fluoride ethylene is added in the coating, so that the coating has good acid-base corrosion resistance and ageing resistance, more importantly, the coating has super-strong hydrophobic property, the film forming property of the coating can be enhanced, the hydrophobicity of the coating can be further improved, rainwater cannot enter a coating layer, and the acid-base corrosion can be reduced to a great extent.

Preferably, the anticorrosive paint for the electric power iron tower comprises the following raw materials in parts by mass:

epoxy resin: 30-32 parts;

polymethyl acrylate: 3-4 parts;

modified short carbon fiber: 2-3 parts of a solvent;

polyvinylidene fluoride ethylene: 2-3 parts of a solvent;

anionic polymer: 1-2 parts;

curing agent: 6-7 parts;

solvent: 9-10 parts;

auxiliary agent: 4-6 parts.

By adopting the technical scheme, the proportion of the coating can be further controlled to form, so that the coating is ensured to have excellent corrosion resistance, and other properties are not influenced, and the comprehensive performance of the coating is optimal.

Preferably, the curing agent is one of a ketimine curing agent or a polyetheramine curing agent, and the solvent is one or more of ethyl acetate, toluene, xylene or N, N-dimethylformamide; the anionic polymer is one of polyethylene dioxythiophene and polystyrene sulfonate, and the auxiliary agent is at least one of a dispersing agent, a leveling agent and a defoaming agent.

By adopting the technical scheme, the curing time of the coating can be shortened by adopting the curing agent of the type, and the painting efficiency is improved. By adopting the solvents, the components such as anionic polymer, polyvinylidene fluoride and polymethyl acrylate in the components can be dissolved, and the compatibility among the components is improved. The anionic polymer can improve the binding effect on cations. By adopting the auxiliary agent, the comprehensive performance of the coating can be further improved.

Preferably, the method for modifying modified chopped carbon fibers comprises the following steps: and adding the chopped carbon fibers into an organic solvent to form a dispersion, adding an amino-containing surfactant into the dispersion, reacting under a nitrogen atmosphere and a heating condition, and filtering and washing after the reaction is finished to obtain the modified chopped carbon fibers.

By adopting the technical scheme, the short carbon fiber has poor dispersibility in the coating, and if the short carbon fiber is directly added into the coating, the flatness and uniformity of the coating can be seriously influenced. In order to increase the dispersibility of the chopped carbon fibers, the chopped carbon fibers are subjected to amino modification, the dispersibility and uniformity of the carbon fibers can be increased to a great extent after the amino modification, the bonding force between the carbon fibers subjected to the amino modification and the epoxy resin is stronger, and the strength of the coating can be enhanced to a certain extent.

Further preferably, the organic solvent is one of benzene, toluene, xylene and chlorobenzene; the concentration of the chopped carbon fibers in the organic solvent is 80-90 g/L; the surfactant with amino group is one of 3-aminopropane triethoxy silicon, N- (2-amino-ethyl) -3-aminopropane triethoxy silicon, 3-aminopropane trimethoxy silicon and N- (2-amino-ethyl) -3-aminopropane trimethoxy silicon; the mass ratio of the chopped carbon fibers to the amino-containing surfactant is 1 (4-10); the heating temperature is 60-80 ℃, and the reaction time is 15-30 h.

By adopting the technical scheme, more amino groups can be grafted on the surface of the carbon fiber by controlling the modification process parameters of the chopped carbon fiber, so that the dispersion performance of the carbon fiber is better improved.

Preferably, the anticorrosive paint for the electric power iron tower further comprises: 2-3 parts of CM infrared powder and 1-2 parts of Basff 5151.

By adopting the technical scheme, the CM infrared powder is further added into the coating, and the wear resistance of the coating can be further enhanced by adding the CM infrared powder; the CM infrared powder has the function of radiating heat, so that partial heat can be radiated under the condition of high temperature in summer, the temperature of the coating is reduced, and the aging of the coating is slowed down; and basf 5151 is an ultraviolet light absorber, which can prevent the ultraviolet light from damaging the polymer in the coating by absorbing the ultraviolet light.

Preferably, the anticorrosive paint for the electric power iron tower further comprises: 2-3 parts of zinc dialkyl dithiophosphate.

By adopting the technical scheme, the zinc dialkyl dithiophosphate in the coating is an oil-soluble zinc salt, can improve the corrosion resistance of the coating after being added, has an anti-oxidation effect, can slow down the aging of resin and prolongs the service life of the coating.

In a second aspect, the present application provides a preparation method of an anticorrosive coating for an electric power iron tower, comprising the following steps:

s1, adding epoxy resin, polymethyl acrylate, polyvinylidene fluoride and anionic polymer into a solvent, and heating to dissolve to obtain a resin solution;

and S2, adding the other components except the curing agent into the resin solution obtained in the step S1, uniformly stirring, finally adding the curing agent, and uniformly stirring to obtain the coating.

In the step S1, the heating temperature is 40-50 ℃; in step S2, the stirring speed is 800 to 900 r/min.

By adopting the technical scheme, the polymer material is dissolved to prepare the resin solution, and then other components are added, mainly because the resin solution has certain viscosity, the phenomenon of coagulation is not easy to occur when other components are added, and the dispersibility is improved by stirring; and finally, adding the curing agent, mainly to avoid adding the curing agent prematurely, so that the curing starts before other components are not fully dispersed, the viscosity of the system is increased, and the other components are not uniformly dispersed.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the modified chopped carbon fibers, the polyvinylidene fluoride and the anionic polymer are introduced into the epoxy resin-based coating, so that the electrochemical corrosion resistance and the acid-base corrosion resistance of the coating can be improved from multiple aspects, the comprehensive performance of the coating is integrally improved, and the coating is better applied to corrosion prevention of an electric power iron tower.

2. CM infrared powder and basf 5151 are introduced into the coating components, the CM infrared powder can radiate heat out of the coating, and the basf 5151 absorbs ultraviolet light, so that the damage of high temperature and ultraviolet light to the coating can be reduced in the aspects of cooling and ultraviolet radiation resistance, and the anti-aging performance of the coating is improved.

3. The zinc dialkyl dithiophosphate is also introduced into the coating components, and mainly has an antioxidation effect and can improve the antioxidation capability of a polymer, so that the pulverization of a coating can be slowed down, and the service life of the coating is prolonged.

Detailed Description

Preparation example preparation of modified chopped carbon fiber

Preparation example 1

Adding 200g of the chopped carbon fibers into 2.5L of toluene, performing ultrasonic treatment for 5 hours to form uniform dispersion liquid, then adding 800g of 3-aminopropane triethoxy silicon, introducing nitrogen into the solution, heating to 60 ℃ under the stirring condition, performing modification reaction for 24 hours, filtering after the reaction is finished, and drying to obtain the modified chopped carbon fibers.

Preparation example 2

Adding 200g of chopped carbon fibers into 2.3L of dimethylbenzene, performing ultrasonic treatment for 6 hours to form uniform dispersion liquid, adding 1400g N- (2-amino-ethyl) -3-aminopropane triethoxy silicon, introducing nitrogen into the solution, heating to 65 ℃ under the stirring condition, performing modification reaction for 30 hours, filtering after the reaction is finished, and drying to obtain the modified chopped carbon fibers.

Preparation example 3

Adding 200g of the chopped carbon fibers into 2.2L of chlorobenzene, performing ultrasonic treatment for 6 hours to form uniform dispersion liquid, then adding 1200g of 3-aminopropane trimethoxy silicon, introducing nitrogen into the solution, heating to 70 ℃ under the stirring condition, performing modification reaction for 26 hours, and filtering and drying after the reaction is finished to obtain the modified chopped carbon fibers.

Preparation example 4

Adding 200g of chopped carbon fibers into 2.4L of toluene, performing ultrasonic treatment for 6 hours to form uniform dispersion liquid, adding 1600g N- (2-amino-ethyl) -3-aminopropane trimethoxy silicon, introducing nitrogen into the solution, heating to 70 ℃ under the stirring condition, performing modification reaction for 30 hours, filtering after the reaction is finished, and drying to obtain the modified chopped carbon fibers.

Examples

Examples 1 to 4

In examples 1 to 4, the proportions of the components are shown in table 1, and the modified carbon fiber was prepared as preparation 1; the preparation method comprises the following steps: s1, adding epoxy resin, polymethyl acrylate, polyvinylidene fluoride and anionic polymer into a solvent, and heating to 40 ℃ to dissolve to obtain a resin solution;

and S2, adding the modified chopped carbon fibers at the rotating speed of 900r/min, stirring for 1h, adding the dispersant BYK-163, the flatting agent BYK-358N and the defoaming agent AFCONA 2045 after uniform dispersion, adding the curing agent after uniform mixing under the stirring condition, and stirring and uniformly mixing to obtain the coating.

TABLE 1 formulation of the proportions of the components of examples 1-4

Comparative example 1

In substantial agreement with example 2, except that polyvinylidene fluoride was not added.

Comparative example 2

Essentially identical to example 2, except that no modified chopped carbon fibers were added.

Comparative example 3

Essentially identical to example 2, with the difference that no polyethylene dioxythiophene was added.

The coatings prepared in the embodiments 1 to 4 are coated on iron plates with the same material of an electric iron tower, and physical performance tests are carried out according to the method in GB/T13448-2019 color coated steel plate and steel strip test method, and the results are shown in Table 2:

TABLE 2

From the data of examples 1 to 4, the coating in examples 1 to 4 has good strength and corrosion resistance, which shows that the coating in the present application has good effect.

Comparative example 1 was inferior to example 2 in the neutral salt spray property, probably because polyvinylidene fluoride was not added, and thus the water repellency thereof was lowered, resulting in a decrease in the corrosion resistance thereof.

Comparative example 2 has substantially no great difference from example 2 in performance, mainly because the modified carbon fiber is used to increase the wear resistance and electrochemical corrosion resistance of the coating, but the wear resistance of the coating itself is improved after polyvinylidene fluoride is added, because the wear resistance is not significantly reduced.

Comparative example 3 shows a decrease in neutral salt spray performance compared to example 3, probably because polyethylene dioxythiophene can complex with the positive ions in the salt spray test, thereby slowing the occurrence of chemical corrosion.

The corrosion potentials and corrosion currents of examples 1 to 4 and comparative examples 1 to 3 were measured, and the results are shown in Table 3.

TABLE 3

	Corrosion potential (corr/V)	Corrosion current (mA/cm2)
			Example 1	-0.512	7.89*10-5
Example 2	-0.449	2.52*10-5
			Example 3	-0.504	5.89*10-5
Example 4	-0.543	8.85*10-5
			Comparative example 1	-0.567	9.17*10-5
Comparative example 2	-0.724	4.89*10-4
			Comparative example 3	-0.859	9.14*10-4

As can be seen from the data in Table 3, the corrosion potentials of examples 1 to 4 were between-0.543 and-0.449, and the corrosion currents thereof were relatively large, so that the electrochemical corrosion thereof was relatively difficult to perform, and the corrosion current densities of examples 1 to 4 were (2.52 to 8.85) × 10 ^-5 Meanwhile, the corrosion current density is smaller, which indicates that the protective effect of the coating is better.

Compared with example 2, the corrosion current density of comparative example 1 is reduced, the corrosion current is increased, which indicates that the electrochemical corrosion resistance is reduced, probably because the polyvinylidene fluoride has better barrier effect, so the corrosion resistance is improved.

Comparative example 2 also shows a decrease in corrosion current density and an increase in corrosion current compared to example 2, but the decrease is higher than in comparative example 1, probably because the addition of the modified carbon fibers enhances the shunting action of the coating, thus improving the corrosion resistance.

The corrosion current density is also reduced and the corrosion current is increased in comparative example 2 compared to example 2, but the reduction is higher than in comparative examples 1 and 2, probably because polyethylenedioxythiophene acts as a better and better complexing metal positive ion, slowing down the current path to some extent and thus improving the corrosion resistance.

Examples 5 to 8

The formulation ratios in examples 5-8 are shown in Table 4.

TABLE 4 formulation of the proportions of the components of examples 5-8

The preparation process was identical to example 1.

The coatings prepared in the embodiments 5 to 8 are coated on iron plates with the same material of an electric iron tower, and physical performance tests are carried out according to the method in GB/T13448-2019 color coated steel plate and steel strip test method, and the results are shown in Table 5:

TABLE 5

The basic performance of the coating layers of examples 5 to 8 was tested, and the results are shown in table 5, which shows that the change of the raw material ratio and the change of the raw materials do not have great influence on the basic strength and corrosion resistance.

The results of the tests of corrosion potential and corrosion current density in examples 5 to 8 are shown in Table 6.

TABLE 6

	Corrosion potential (corr/V)	Corrosion current (mA/cm2)
			Example 5	-0.467	3.12*10-5
Example 6	-0.425	1.89*10-5
			Example 7	-0.437	2.32*10-5
Example 8	-0.498	5.94*10-5

From the data in table 6, it can be seen that the change of the raw material ratio and the change of the raw materials have certain influence on the corrosion potential and the corrosion current density of the coating, but in general, the range is not very large, and the electrochemical corrosion resistance performance in examples 5 to 8 is superior.

Examples 9 to 12

The component ratios of examples 9 to 12 are shown in Table 7.

TABLE 7 formulation of the proportions of the components of examples 9-12

The coatings prepared in examples 9 to 12 were coated on iron plates of the same material as the power iron tower, and physical property tests were performed according to the method of GB/T13448-:

TABLE 8

As shown in the data in Table 8, in examples 9-12, the addition of CM infrared powder, BASF 5151 and zinc dialkyl dithiophosphate did not significantly affect the strength and corrosion resistance of the base.

The results of the tests of corrosion potential and corrosion current density in examples 5 to 8 are shown in Table 9.

TABLE 9

	Potential for Corrosion (corr/V)	Corrosion current (mA/cm2)
			Example 9	-0.443	2.74*10-5
Example 10	-0.459	3.98*10-5
			Example 11	-0.488	6.12*10-5
Example 12	-0.466	5.94*10-5

As can be seen from the data in Table 9, the corrosion potential and the corrosion current density of the alloy with the addition of CM IR powder and BASF 5151 and zinc dialkyldithiophosphate fluctuate to some extent, but the change range is not large, which indicates that the CM IR powder and BASF 5151 do not affect the electrochemical corrosion resistance.

After the coatings in examples 5 to 12 were coated on iron sheets, the cured coatings were stabilized, and then the cured coatings were placed in an aging oven at 100 ℃ for 2000 hours, and the results of the observation of the coating were shown in table 10.

Watch 10

As can be seen from the data in Table 10, in examples 5 to 8, cracks and blisters occurred after the aging resistance test. However, in examples 9 to 12, these cases do not occur, probably because the addition of CM infrared powder and Pasteur 5151 and zinc salt of dialkyl dithiophosphate can further improve the aging resistance.

The above are preferred embodiments of the present application, and the scope of protection of the present application is not limited thereto, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. The anticorrosive paint for the electric power iron tower is characterized by comprising the following raw materials in parts by mass:

epoxy resin: 25-35 parts;

polymethyl acrylate: 2-5 parts;

modified short carbon fiber: 1-5 parts;

polyvinylidene fluoride ethylene: 1-4 parts;

anionic polymer: 1-3 parts;

curing agent: 5-8 parts;

solvent: 8-12 parts of a solvent;

auxiliary agent: 3-8 parts.

2. The anticorrosive paint for the electric power iron tower as claimed in claim 1, wherein the anticorrosive paint comprises the following raw materials in parts by mass:

epoxy resin: 30-32 parts;

polymethyl acrylate: 3-4 parts;

modified short carbon fiber: 2-3 parts of a solvent;

polyvinylidene fluoride ethylene: 2-3 parts of a solvent;

anionic polymer: 1-2 parts;

curing agent: 6-7 parts;

solvent: 9-10 parts;

auxiliary agent: 4-6 parts.

3. The anticorrosive paint for the electric power iron tower as claimed in claim 2, wherein the curing agent is one of a ketimine curing agent or a polyetheramine curing agent, and the solvent is one or more of ethyl acetate, toluene, xylene or N, N-dimethylformamide; the anionic polymer is one of polyethylene dioxythiophene and polystyrene sulfonate, and the auxiliary agent is at least one of a dispersing agent, a leveling agent and a defoaming agent.

4. The anticorrosive paint for the electric power iron tower as claimed in claim 1, wherein the modification method of the modified chopped carbon fibers comprises the following steps: and adding the chopped carbon fibers into an organic solvent to form a dispersion, adding an amino-containing surfactant into the dispersion, reacting under a nitrogen atmosphere and under a heating condition, and filtering and washing after the reaction is finished to obtain the modified chopped carbon fibers.

5. The anticorrosive paint for the electric power iron tower as claimed in claim 4, wherein the organic solvent is one of benzene, toluene, xylene and chlorobenzene; the concentration of the chopped carbon fibers in the organic solvent is 80-90 g/L; the surfactant with amino group is one of 3-aminopropane triethoxy silicon, N- (2-amino-ethyl) -3-aminopropane triethoxy silicon, 3-aminopropane trimethoxy silicon and N- (2-amino-ethyl) -3-aminopropane trimethoxy silicon; the mass ratio of the chopped carbon fibers to the amino-containing surfactant is 1 (4-10); the heating temperature is 60-80 ℃, and the reaction time is 15-30 h.

6. The anticorrosive paint for electric power iron towers according to claim 1, further comprising: 2-3 parts of CM infrared powder and 1-2 parts of Basff 5151.

7. The anticorrosive paint for electric power iron towers according to claim 6, further comprising: 2-3 parts of zinc dialkyl dithiophosphate.

8. The preparation method of the anticorrosive paint for the electric power iron tower according to any one of claims 1 to 7, comprising the following steps:

9. The preparation method of the anticorrosive paint for the electric power iron tower is characterized in that in the step S1, the heating temperature is 40-50 ℃; in step S2, the stirring speed is 800 to 900 r/min.