CN117625002A - Reinforcing steel bar rust-resistant spraying material suitable for high-salinity environment and application method thereof - Google Patents
Reinforcing steel bar rust-resistant spraying material suitable for high-salinity environment and application method thereof Download PDFInfo
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- 239000000463 material Substances 0.000 title claims abstract description 41
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title claims abstract description 10
- 238000005507 spraying Methods 0.000 title claims description 40
- 229910001294 Reinforcing steel Inorganic materials 0.000 title description 9
- 239000002033 PVDF binder Substances 0.000 claims abstract description 43
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims abstract description 43
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 36
- 239000010959 steel Substances 0.000 claims abstract description 36
- 239000003822 epoxy resin Substances 0.000 claims abstract description 24
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 24
- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical compound [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 claims abstract description 20
- 239000007921 spray Substances 0.000 claims abstract description 18
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000012752 auxiliary agent Substances 0.000 claims abstract description 17
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 17
- 239000000203 mixture Substances 0.000 claims description 25
- 238000003756 stirring Methods 0.000 claims description 22
- 238000002156 mixing Methods 0.000 claims description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 17
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 16
- 229910021389 graphene Inorganic materials 0.000 claims description 16
- 239000002245 particle Substances 0.000 claims description 12
- 238000002360 preparation method Methods 0.000 claims description 10
- NAQMVNRVTILPCV-UHFFFAOYSA-N hexane-1,6-diamine Chemical compound NCCCCCCN NAQMVNRVTILPCV-UHFFFAOYSA-N 0.000 claims description 8
- 230000003075 superhydrophobic effect Effects 0.000 claims description 8
- -1 polytetrafluoroethylene Polymers 0.000 claims description 7
- PIICEJLVQHRZGT-UHFFFAOYSA-N Ethylenediamine Chemical compound NCCN PIICEJLVQHRZGT-UHFFFAOYSA-N 0.000 claims description 6
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims description 6
- 239000006185 dispersion Substances 0.000 claims description 6
- 239000000839 emulsion Substances 0.000 claims description 6
- 229910052731 fluorine Inorganic materials 0.000 claims description 6
- 239000011737 fluorine Substances 0.000 claims description 6
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 6
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 6
- 239000000843 powder Substances 0.000 claims description 6
- 229920005989 resin Polymers 0.000 claims description 6
- 239000011347 resin Substances 0.000 claims description 6
- VILCJCGEZXAXTO-UHFFFAOYSA-N 2,2,2-tetramine Chemical compound NCCNCCNCCN VILCJCGEZXAXTO-UHFFFAOYSA-N 0.000 claims description 4
- RPNUMPOLZDHAAY-UHFFFAOYSA-N Diethylenetriamine Chemical compound NCCNCCN RPNUMPOLZDHAAY-UHFFFAOYSA-N 0.000 claims description 4
- 125000001931 aliphatic group Chemical group 0.000 claims description 4
- QOHMWDJIBGVPIF-UHFFFAOYSA-N n',n'-diethylpropane-1,3-diamine Chemical compound CCN(CC)CCCN QOHMWDJIBGVPIF-UHFFFAOYSA-N 0.000 claims description 4
- 229920000768 polyamine Polymers 0.000 claims description 4
- 239000002904 solvent Substances 0.000 claims description 4
- 239000002002 slurry Substances 0.000 claims description 3
- 238000001132 ultrasonic dispersion Methods 0.000 claims description 3
- 238000004090 dissolution Methods 0.000 claims description 2
- 230000007797 corrosion Effects 0.000 abstract description 8
- 238000005260 corrosion Methods 0.000 abstract description 8
- 239000004568 cement Substances 0.000 abstract description 6
- 238000009364 mariculture Methods 0.000 abstract description 4
- 239000011150 reinforced concrete Substances 0.000 abstract description 4
- 239000003513 alkali Substances 0.000 abstract description 3
- 230000005764 inhibitory process Effects 0.000 abstract description 3
- 230000002265 prevention Effects 0.000 abstract description 3
- 239000003973 paint Substances 0.000 abstract 1
- 239000011248 coating agent Substances 0.000 description 13
- 238000000576 coating method Methods 0.000 description 13
- 239000004567 concrete Substances 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 8
- 238000012360 testing method Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 5
- 239000002689 soil Substances 0.000 description 5
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 4
- 230000002209 hydrophobic effect Effects 0.000 description 4
- 239000010410 layer Substances 0.000 description 3
- 238000002791 soaking Methods 0.000 description 3
- 230000000844 anti-bacterial effect Effects 0.000 description 2
- 239000003899 bactericide agent Substances 0.000 description 2
- 239000002585 base Substances 0.000 description 2
- 239000000645 desinfectant Substances 0.000 description 2
- 238000006056 electrooxidation reaction Methods 0.000 description 2
- 125000003916 ethylene diamine group Chemical group 0.000 description 2
- 150000002366 halogen compounds Chemical class 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000004814 polyurethane Substances 0.000 description 2
- 229920002635 polyurethane Polymers 0.000 description 2
- 239000011253 protective coating Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000011780 sodium chloride Substances 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical class [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 238000010621 bar drawing Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
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- 238000011161 development Methods 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 229920001600 hydrophobic polymer Polymers 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000003469 silicate cement Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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Abstract
The application relates to a spray material, in particular to a steel bar rust-resistant spray material suitable for a high-salinity environment and a use method thereof, wherein the paint comprises the following components: aqueous epoxy resin, polyvinylidene fluoride, N-methyl pyrrolidone, sodium dodecyl sulfate and an auxiliary agent. The rust-proof agent has good rust-proof performance, can form strong adhesion with cement, and is suitable for corrosion inhibition and rust prevention of reinforced concrete structures in high-saline-alkali characteristic lands and retired land-based mariculture lands.
Description
Technical Field
The application relates to the technical field of spray materials, in particular to a steel bar rust-resistant spray material suitable for a high-salinity environment and a use method thereof.
The background technology is as follows:
the data show that the total area of the existing saline-alkali soil in China reaches 99.13 ten thousand square kilometers, and the total area of the existing saline-alkali soil accounts for about 10% of the total area of the national soil, and the northwest and northeast areas are the traditional salinization areas. Land salinization problems also exist in the Bohai sea region, the Chang-delta region, the Zhu-delta region and the Hainan island region, and particularly land-based mariculture plots which are retired or are about to be retired have obvious high salinization characteristics. The large amount of disinfectants, bactericides, halogen compounds and sulfate ion compounds remained in the soil can prevent the natural restoration of the ecological system of the local block on one hand and cause serious corrosion to the underground reinforced concrete structure on the other hand.
The high-concentration disinfectant, bactericide, halogen compound and sulfate ion compound which are reserved in the soil in the retired land-based mariculture land block not only cause serious diseases such as extrusion expansion, peeling, loosening and the like on the cementing material and aggregate of the underground concrete, directly deteriorate the material and strength of the concrete, but also reduce the sectional area of the steel bar along with migration of water molecules into the concrete and continuous corrosion of the surface layer of the steel bar, so that the bearing capacity and durability of the underground reinforced concrete structure are greatly reduced.
The steel bar is the most main stressed component of the concrete structure, the research results of the novel concrete material for resisting the salinization environment and the seepage and rust resisting material doped with the concrete are quite many at present, but the research results of the steel bar rust resisting surface coating material are quite few. The development and preparation of the reinforcing steel bar surface layer rust-resistant material which has long service life, good effect and convenient spraying have great engineering application value.
Disclosure of Invention
The application provides a steel bar rust-resistant spraying material suitable for high-salinity alkaline environment, which has good rust-resistant performance, can form strong adhesion with cement, is suitable for corrosion inhibition and rust prevention of steel bars in reinforced concrete structures in high-salinity alkaline land and retired land-based mariculture land, and has the following specific scheme.
The steel bar rust-resistant spraying material suitable for the high-salinity environment comprises the following components: aqueous epoxy resin, polyvinylidene fluoride, N-methyl pyrrolidone, sodium dodecyl sulfate and auxiliary agents; the preparation method of the spray material comprises the following steps:
step (1): taking a certain amount of N-methyl pyrrolidone, adding organic fluorine resin particles with the particle size smaller than 200 meshes into the mixture for full dissolution, mixing the mixture, adding the mixture into aqueous epoxy resin, adding sodium dodecyl sulfate and an auxiliary agent, and continuously stirring the mixture to form uniform emulsion to obtain solution A, wherein the N-methyl pyrrolidone is the components: aqueous epoxy resin: polyvinylidene fluoride: sodium dodecyl sulfate: the mass ratio of the auxiliary agent is 5-8:40-50:5-7:4-6:1-2; the molecular weight of the polyvinylidene fluoride is 5000-200000;
step (2): adding the curing agent into water for full mixing to obtain a solution B, wherein the mass ratio of the curing agent to the water is 4-6:1. Wherein the curing agent is aliphatic polyamine, and is specifically one or more of ethylenediamine, hexamethylenediamine, diethylenetriamine, triethylenetetramine and diethylaminopropylamine.
The organic fluorine resin is one of polyvinylidene fluoride, polytetrafluoroethylene and super-hydrophobic modified polyvinylidene fluoride, and the molecular weight is 5000-200000.
The application method of the steel bar rust-resistant spraying material suitable for the high-salinity environment comprises the following steps of:
step (a): derusting the steel bar to be coated;
step (b): adding a proper amount of solution B into solution A, uniformly stirring and curing, wherein the solution A is prepared by the following steps: the mass ratio of the solution B is 2-4:1;
step (c): spraying the cured solution obtained in the step (b) twice, wherein the thickness of each spraying is 0.05-0.15mm, and airing the surface between the two spraying.
Or, a steel bar rust-resistant spraying material suitable for high-salinity alkalization environment, which comprises the following components: the epoxy resin, polyvinylidene fluoride, N-methyl pyrrolidone, sodium dodecyl sulfate, graphene and an auxiliary agent;
the preparation method of the spray material comprises the following steps:
step (1): firstly adding water into a dispersing container, then adding sodium dodecyl sulfate, preparing a dispersing solution, gradually adding graphene powder while stirring, continuously stirring for more than 20min for primary dispersion after the powder is completely added, transferring the primary dispersion into an ultrasonic dispersing device for ultrasonic dispersion for more than 60min, adding graphene slurry into aqueous epoxy resin, and uniformly stirring and mixing to obtain a solution A; wherein the weight ratio of the graphene to the aqueous epoxy resin is 0.5-2:100;
step (2): taking a certain amount of N-methyl pyrrolidone, adding polyvinylidene fluoride particles with the particle size smaller than 200 meshes into the mixture to be fully dissolved, mixing the mixture, adding the mixture into aqueous epoxy resin, adding sodium dodecyl sulfate and an auxiliary agent, and continuously stirring the mixture to form uniform emulsion to obtain a solution B; wherein each component is N-methyl pyrrolidone solvent: aqueous epoxy resin: polyvinylidene fluoride: sodium dodecyl sulfate: the mass ratio of the auxiliary agent is 5-8:40-50:5-7:4-6:1-2; the molecular weight of the polyvinylidene fluoride is 5000-200000;
step (3): adding the curing agent into water for full mixing to obtain solution C, wherein the mass ratio of the curing agent to the water is 4-6:1. Wherein the curing agent is aliphatic polyamine, and is specifically one or more of ethylenediamine, hexamethylenediamine, diethylenetriamine, triethylenetetramine and diethylaminopropylamine.
The organic fluorine resin is one of polyvinylidene fluoride, polytetrafluoroethylene and super-hydrophobic modified polyvinylidene fluoride, and the molecular weight is 5000-200000.
Further, the spray thickness is a dry film thickness.
The spraying material has the advantages of long service life, good effect, convenient spraying and great engineering application value. The method has the following specific beneficial effects:
(1) The hydrophobic composition such as polyvinylidene fluoride is used as a coating material, and can be combined with the hydrophobic end of the coating material in the process of mixing the coating material with the aqueous epoxy resin, and the polyvinylidene fluoride is partially coated in the process of curing and crosslinking to form good bonding force. The polyvinylidene fluoride has good acid-base corrosion resistance, mechanical strength and super-strong hydrophobic property, on one hand, the damage of alkaline environment to the coating can be reduced, and the durable antirust property is maintained; on the other hand, the super-hydrophobic property endows the protective coating with stronger chlorine ion resistance, and when corrosive liquid is placed to permeate, especially when cracks are generated in the coating due to unexpected factors and the like, the hydrophobicity of the protective coating can further organize the entry of moisture, so that the long-term rust prevention capability is maintained.
(2) The coating with two different components is used for multi-layer coating, so that better antirust performance and bonding strength are brought. The graphene is added to the bottom layer, so that the conductivity of the coating can be effectively improved, and the electrochemical corrosion on the surface of the steel bar can be well inhibited; meanwhile, the graphene has stronger toughness and strength, and can improve the bonding strength of the reinforcing steel bars and cement. The super-hydrophobic material is added to the outer layer, and the super-hydrophobic polymer can be fixed in the coating layer by spraying for multiple times, so that the occurrence probability of spraying defects is reduced, and the effect of reducing the penetration of corrosive liquid to the surface of the steel bar is achieved.
Detailed Description
The technical scheme and effect of the present invention are further described below with reference to specific examples.
Example 1
A preparation method of the steel bar rust-resistant spraying material suitable for the high-salinity environment comprises the following steps:
step (1): taking a certain amount of N-methyl pyrrolidone, adding polyvinylidene fluoride particles with the particle size smaller than 200 meshes into the mixture to be fully dissolved, mixing the mixture, adding the mixture into aqueous epoxy resin, adding sodium dodecyl sulfate and an auxiliary agent, and continuously stirring the mixture to form uniform emulsion to obtain a solution A. Wherein each component is N-methyl pyrrolidone solvent: aqueous epoxy resin: polyvinylidene fluoride: sodium dodecyl sulfate: the mass ratio of the auxiliary agent is 5:40:5:4:1; the molecular weight of the polyvinylidene fluoride is 5000-200000.
Step (2): and adding a curing agent into water for full mixing to obtain a solution B, wherein the curing agent is ethylenediamine, and the mass ratio of ethylenediamine to water is 5:1.
When in use, the step (a): derusting the steel bar to be coated;
step (b): adding a proper amount of solution B into solution A, uniformly stirring and curing, wherein the solution A is prepared by the following steps: the mass ratio of the solution B is 3:1;
step (c): spraying the cured solution obtained in the step (b) twice, wherein the thickness of each spraying is 0.1mm (dry film thickness), and airing the surface between the two spraying.
Example 2
A preparation method of the steel bar rust-resistant spraying material suitable for the high-salinity environment comprises the following steps: step (1): adding water into a dispersing container, adding sodium dodecyl sulfate, preparing a dispersing solution, gradually adding graphene powder while stirring, continuously stirring for more than 20min for primary dispersion after the powder is completely added, transferring the primary dispersion into an ultrasonic dispersing device for ultrasonic dispersion for more than 60min, adding graphene slurry into aqueous epoxy resin, and uniformly stirring and mixing to obtain a solution A. Wherein the weight ratio of the graphene to the aqueous epoxy resin is 1:100.
Step (2): taking a certain amount of N-methyl pyrrolidone, adding polyvinylidene fluoride particles with the particle size smaller than 200 meshes into the mixture to be fully dissolved, mixing the mixture, adding the mixture into aqueous epoxy resin, adding sodium dodecyl sulfate and an auxiliary agent, and continuously stirring the mixture to form uniform emulsion to obtain a solution B. Wherein each component is N-methyl pyrrolidone solvent: aqueous epoxy resin: polyvinylidene fluoride: sodium dodecyl sulfate: the mass ratio of the auxiliary agent is 5:40:5:4:1; the molecular weight of the polyvinylidene fluoride is 5000-200000.
Step (3): adding a curing agent into water for full mixing to obtain a solution C, wherein the curing agent is ethylenediamine, and each component of ethylenediamine: the water mass ratio was 5:1.
When in use, the step (a): derusting the steel bar to be coated;
step (b): adding a proper amount of solution C into solution A, uniformly stirring and curing, wherein the solution A is prepared by the following steps: the mass ratio of the solution C is 2:1, a step of;
step (c): adding a proper amount of solution C into the solution B, uniformly stirring and curing; wherein solution B: the mass ratio of the solution C is 3:1, a step of;
step (d): spraying the cured solution obtained in the step (b) twice, wherein the spraying thickness is 0.05mm (dry film thickness), and airing the surface between spraying; and (3) spraying the cured solution obtained in the step (c) twice, wherein each spraying is performed for 0.05mm (dry film thickness), and the surface is dried in the air between spraying.
Example 3
A steel bar rust-resistant spray coating material suitable for high-salinity environment is prepared and used in the same steps as in example 1, and the difference from example 1 is that polyvinylidene fluoride is replaced by polytetrafluoroethylene.
Example 4
A steel bar rust-resistant spray material suitable for use in a high-salinity environment is prepared and used in the same manner as in example 2, and differs from example 1 in that polyvinylidene fluoride is replaced by polytetrafluoroethylene.
Example 5
The preparation and use steps of the steel bar rust-resistant spraying material suitable for the high-salinity environment are the same as those of the example 2, and the difference from the example 1 is that the polyvinylidene fluoride is replaced by the super-hydrophobic modified polyvinylidene fluoride.
Comparative examples 1 to 4
The differences between comparative examples 1-4 and examples 1-2 are shown in Table 1
Table 1 summary of the differences between comparative examples 1-4 and the example preparation methods
| Sequence number | Comparative examples | Differences in preparation methods |
| Comparative example 1 | Example 1 | Instead of polyvinylidene fluoride, the same amount of aqueous polyurethane was used instead of polyvinylidene fluoride |
| Comparative example 2 | Example 2 | Instead of polyvinylidene fluoride, the same amount of aqueous polyurethane was used instead of polyvinylidene fluoride |
| Comparative example 3 | Example 2 | Graphene is not added |
| Comparative example 4 | Example 2 | Hydrophilic modified polyvinylidene fluoride is adopted to replace polyvinylidene fluoride |
Performance testing
And (3) using reinforcing steel bars with the diameter of 10mm as a base material, polishing the reinforcing steel bars, derusting, and keeping the reinforcing steel bars dry for standby. After the coating is dried, the coating is placed at room temperature for one week, and then the solution soaking corrosion resistance and the performance of the coated steel bar are tested, and the test results are shown in table 2.
Solution immersion corrosion protection test of the coating: and placing the coated test piece in a solution prepared according to the requirements for soaking, replacing the solution every 3 days, and checking and recording the surface of the test piece with a day period. The soaking solution is prepared by the following steps: 4% NaCl solution (mass fraction), 0.3mol/LKOH solution+4% NaCl solution.
The concrete pouring is carried out by selecting common silicate cement with cement strength grade of 42.5, mixing cement, sand, stones and the like in the concrete according to the conventional proportion, molding and curing for four weeks, and then carrying out a drawing test. The coated steel bar drawing test is performed by reference to the standard DL/T5150-2017, water engineering concrete test procedure.
TABLE 2 Performance test results
It can be seen that the addition of hydrophobic substances such as polyvinylidene fluoride can effectively improve the corrosion resistance of the reinforcing steel bar, and meanwhile, the bonding strength is kept high. A certain amount of graphene is added, so that the conductivity of the coating can be effectively improved, and a certain inhibition effect is generated on electrochemical corrosion on the surface of the steel bar; meanwhile, the graphene has stronger toughness and strength, and can improve the bonding strength of the reinforcing steel bars and cement.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (10)
1. The steel bar rust-resistant spraying material suitable for the high-salinity environment is characterized by comprising the following components: aqueous epoxy resin, polyvinylidene fluoride, N-methyl pyrrolidone, sodium dodecyl sulfate and auxiliary agents; the preparation method of the spray material comprises the following steps:
step (1): taking a certain amount of N-methyl pyrrolidone, adding organic fluorine resin particles with the particle size smaller than 200 meshes into the mixture for full dissolution, mixing the mixture, adding the mixture into aqueous epoxy resin, adding sodium dodecyl sulfate and an auxiliary agent, and continuously stirring the mixture to form uniform emulsion to obtain solution A, wherein the N-methyl pyrrolidone is the components: aqueous epoxy resin: polyvinylidene fluoride: sodium dodecyl sulfate: the mass ratio of the auxiliary agent is 5-8:40-50:5-7:4-6:1-2; the molecular weight of the polyvinylidene fluoride is 5000-200000;
step (2): adding the curing agent into water for full mixing to obtain a solution B, wherein the mass ratio of the curing agent to the water is 4-6:1.
2. The steel bar rust resistant spray material suitable for use in a high salinity and alkalinity environment according to claim 1, wherein the curing agent is an aliphatic polyamine, and specifically is one or more of ethylenediamine, hexamethylenediamine, diethylenetriamine, triethylenetetramine and diethylaminopropylamine.
3. The steel bar rust-resistant spraying material suitable for the high-salinity environment according to claim 1, wherein the organic fluorine resin is one of polyvinylidene fluoride, polytetrafluoroethylene and super-hydrophobic modified polyvinylidene fluoride, and the molecular weight is 5000-200000.
4. The steel bar rust resistant spray material suitable for use in a high salinity environment of claim 1, wherein the spray thickness is a dry film thickness.
5. A method of using the steel bar rust resistant spray material of any one of claims 1-4 in a high salinization environment, comprising the steps of:
step (a): derusting the steel bar to be coated;
step (b): adding a proper amount of solution B into solution A, uniformly stirring and curing, wherein the solution A is prepared by the following steps: the mass ratio of the solution B is 2-4:1;
step (c): spraying the cured solution obtained in the step (b) twice, wherein the thickness of each spraying is 0.05-0.15mm, and airing the surface between the two spraying.
6. The steel bar rust-resistant spraying material suitable for the high-salinity environment is characterized by comprising the following components: the epoxy resin, polyvinylidene fluoride, N-methyl pyrrolidone, sodium dodecyl sulfate, graphene and an auxiliary agent; the preparation method of the spray material comprises the following steps:
step (1): firstly adding water into a dispersing container, then adding sodium dodecyl sulfate, preparing a dispersing solution, gradually adding graphene powder while stirring, continuously stirring for more than 20min for primary dispersion after the powder is completely added, transferring the primary dispersion into an ultrasonic dispersing device for ultrasonic dispersion for more than 60min, adding graphene slurry into aqueous epoxy resin, and uniformly stirring and mixing to obtain a solution A; wherein the weight ratio of the graphene to the aqueous epoxy resin is 0.5-2:100;
step (2): taking a certain amount of N-methyl pyrrolidone, adding polyvinylidene fluoride particles with the particle size smaller than 200 meshes into the mixture to be fully dissolved, mixing the mixture, adding the mixture into aqueous epoxy resin, adding sodium dodecyl sulfate and an auxiliary agent, and continuously stirring the mixture to form uniform emulsion to obtain a solution B; wherein each component is N-methyl pyrrolidone solvent: aqueous epoxy resin: polyvinylidene fluoride: sodium dodecyl sulfate: the mass ratio of the auxiliary agent is 5-8:40-50:5-7:4-6:1-2; the molecular weight of the polyvinylidene fluoride is 5000-200000;
step (3): adding the curing agent into water for full mixing to obtain solution C, wherein the mass ratio of the curing agent to the water is 4-6:1.
7. The steel bar rust resistant spray material suitable for use in a high salinity and alkalinity environment according to claim 6, wherein the curing agent is an aliphatic polyamine, and specifically is one or more of ethylenediamine, hexamethylenediamine, diethylenetriamine, triethylenetetramine and diethylaminopropylamine.
8. The steel bar rust-resistant spraying material suitable for high-salinity environment according to claim 5, wherein the organic fluorine resin is one of polyvinylidene fluoride, polytetrafluoroethylene and super-hydrophobic modified polyvinylidene fluoride, and the molecular weight is 5000-200000.
9. The steel bar rust resistant spray material of claim 6 wherein the spray thickness is a dry film thickness.
10. A method of using the steel bar rust resistant spray material of any one of claims 6 to 9 in a high salinization environment, comprising the steps of:
step (a): derusting the steel bar to be coated;
step (b): adding a proper amount of solution C into solution A, uniformly stirring and curing, wherein the solution A is prepared by the following steps: the mass ratio of the solution C is 1-3:1, a step of;
step (c): adding a proper amount of solution C into the solution B, uniformly stirring and curing; wherein solution B: the mass ratio of the solution C is 2-4:1;
step (d): spraying the cured solution obtained in the step (b) twice, wherein the spraying thickness is 0.04-0.06mm, and airing the surface between spraying; spraying the cured solution obtained in the step (c) twice, wherein each spraying is 0.04-0.06mm, and airing the surface between spraying.
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| CN118006195A (en) * | 2024-03-11 | 2024-05-10 | 国网吉林省电力有限公司四平供电公司 | Preparation method of anti-friction self-repairing conductive anticorrosive paint and paint |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118006195A (en) * | 2024-03-11 | 2024-05-10 | 国网吉林省电力有限公司四平供电公司 | Preparation method of anti-friction self-repairing conductive anticorrosive paint and paint |
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