CN115999876A - Corrosion-resistant coating process for earthing tank - Google Patents
Corrosion-resistant coating process for earthing tank Download PDFInfo
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- CN115999876A CN115999876A CN202310158229.7A CN202310158229A CN115999876A CN 115999876 A CN115999876 A CN 115999876A CN 202310158229 A CN202310158229 A CN 202310158229A CN 115999876 A CN115999876 A CN 115999876A
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- earthing
- paint
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- 238000005260 corrosion Methods 0.000 title claims abstract description 25
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- 238000002360 preparation method Methods 0.000 claims description 6
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- MECNWXGGNCJFQJ-UHFFFAOYSA-N 3-piperidin-1-ylpropane-1,2-diol Chemical compound OCC(O)CN1CCCCC1 MECNWXGGNCJFQJ-UHFFFAOYSA-N 0.000 claims description 5
- 229920001730 Moisture cure polyurethane Polymers 0.000 claims description 5
- 239000002202 Polyethylene glycol Substances 0.000 claims description 5
- GVGUFUZHNYFZLC-UHFFFAOYSA-N dodecyl benzenesulfonate;sodium Chemical compound [Na].CCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 GVGUFUZHNYFZLC-UHFFFAOYSA-N 0.000 claims description 5
- RBNPOMFGQQGHHO-UHFFFAOYSA-N glyceric acid Chemical compound OCC(O)C(O)=O RBNPOMFGQQGHHO-UHFFFAOYSA-N 0.000 claims description 5
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- 238000000034 method Methods 0.000 claims description 5
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- 229940080264 sodium dodecylbenzenesulfonate Drugs 0.000 claims description 5
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- 238000005238 degreasing Methods 0.000 claims description 2
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- 239000002689 soil Substances 0.000 abstract description 16
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- VGHSXKTVMPXHNG-UHFFFAOYSA-N 1,3-diisocyanatobenzene Chemical group O=C=NC1=CC=CC(N=C=O)=C1 VGHSXKTVMPXHNG-UHFFFAOYSA-N 0.000 description 3
- 239000005059 1,4-Cyclohexyldiisocyanate Substances 0.000 description 3
- VPWNQTHUCYMVMZ-UHFFFAOYSA-N 4,4'-sulfonyldiphenol Chemical compound C1=CC(O)=CC=C1S(=O)(=O)C1=CC=C(O)C=C1 VPWNQTHUCYMVMZ-UHFFFAOYSA-N 0.000 description 3
- JGFZNNIVVJXRND-UHFFFAOYSA-N N,N-Diisopropylethylamine (DIPEA) Chemical compound CCN(C(C)C)C(C)C JGFZNNIVVJXRND-UHFFFAOYSA-N 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
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- 239000004215 Carbon black (E152) Substances 0.000 description 2
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Abstract
The application discloses an anti-corrosion coating process of a soil covering tank, and belongs to the technical field of coating processing of the soil covering tank. The anti-corrosion coating process of the earthing tank comprises the following steps of: (1) Sand blasting and rust removing are carried out on the surface of the earthing tank, so that the roughness Ra of the earthing tank is 75-100 mu m, the cleanliness Sa is 2.5-3.0 grade, then priming paint is coated on the welding seam, and the earthing tank is flattened through sand paper; (2) Spraying primer on the surface of the earthing tank by adopting a high-pressure airless spraying method, and curing for 1-3h at 50-65 ℃; (3) Spraying intermediate paint on the surface of the primer by adopting a high-pressure airless spraying method, curing for 0.8-1.5h at 35-45 ℃, polishing the surface of the intermediate paint by using sand paper, and removing polishing ash; (4) And spraying finishing paint on the surface of the intermediate paint by adopting a high-pressure airless spraying method, and curing for 20-30 hours at 25-30 ℃ to obtain the coated earthing tank. The paint film prepared by the coating process has good flexibility, strong adhesive force with the earthing tank, excellent corrosion resistance and weather resistance, and long-lasting protection for the earthing tank.
Description
Technical Field
The application relates to an anti-corrosion coating process of a soil covering tank, and belongs to the technical field of coating processing of the soil covering tank.
Background
The explosion fire accident of the liquefied hydrocarbon storage tank causes great casualties and property loss, and the earthing storage tank solves the safety problem. The earthing tank has the following advantages compared with the ground spherical tank: the safety and the operation stability are higher, the occurrence of steam cloud explosion is avoided, the damage of other damages such as adjacent heat sources, explosion shock waves, splash objects and the like to the storage tank is avoided, and the intrinsic safety of equipment is truly realized; in addition, the earthing type storage tank reduces the influence of the change of the atmospheric temperature and the surrounding environment, has stable operation conditions, ensures that liquefied hydrocarbon is more beneficial to long-term stable storage, ensures that operation production is more stable, reduces the safety distance between the earthing type storage tank and surrounding adjacent facilities, and improves the land utilization rate.
The soil covering tank is positioned in the area near the ground, and has the characteristics of soil moisture, chlorine ions, sulfate ions, microorganisms and the like; paint films are coated on the surface of the earthing tank in a brushing or roller coating mode to protect the earthing tank; at present, a paint film prepared by using a conventional paint according to a conventional coating process is poor in corrosion resistance, poor in mechanical property, easy to crack and fall off, resistant to acid, alkali and salt corrosion and weather resistant.
Disclosure of Invention
In order to solve the problems, the anti-corrosion coating process of the earthing tank is provided, the prepared paint film has good flexibility, strong adhesive force with the earthing tank, excellent anti-corrosion property and weather resistance, and long-lasting protection for the earthing tank.
The invention is realized by the following technical scheme:
an anti-corrosion coating process of a soil covering tank comprises the following steps of:
(1) Sand blasting and rust removing are carried out on the surface of the earthing tank, so that the roughness Ra of the earthing tank is 75-100 mu m, the cleanliness Sa is 2.5-3.0 grade, then priming paint is coated on the welding seam, and the earthing tank is flattened through sand paper;
(2) Spraying primer on the surface of the earthing tank by adopting a high-pressure airless spraying method, and curing for 1-3h at 50-65 ℃;
(3) Spraying intermediate paint on the surface of the primer by adopting a high-pressure airless spraying method, curing for 0.8-1.5h at 35-45 ℃, polishing the surface of the intermediate paint by using sand paper, and removing polishing ash;
(4) And spraying finishing paint on the surface of the intermediate paint by adopting a high-pressure airless spraying method, and curing for 20-30 hours at 25-30 ℃ to obtain the coated earthing tank.
Optionally, the thickness of the primer is 100-120 μm, the thickness of the intermediate paint is 30-50 μm, and the thickness of the top paint is 40-60 μm.
Optionally, the primer coating comprises the following components in parts by weight: 40-65 parts of modified epoxy resin, 15-25 parts of graphene oxide, 8-12 parts of polypropylene glycol diglycidyl ether, 5-10 parts of curing agent, 1-3 parts of dispersing agent and 0.5-2 parts of defoaming agent.
Optionally, the preparation method of the modified epoxy resin comprises the following steps: mixing isocyanate and polytetrahydrofuran, and stirring and reacting for 0.5-1.2h at 20-40 ℃ to obtain polyurethane prepolymer; adding bisphenol epoxy resin and organic tertiary amine catalyst, stirring and reacting for 2-4h at 70-90 ℃ to obtain modified epoxy resin;
wherein, the weight ratio of isocyanate, bisphenol type epoxy resin and polytetrahydrofuran is 1: (2.4-3): (3-5.8);
the addition amount of the organic tertiary amine catalyst is 5-8wt% of the bisphenol type epoxy resin.
Optionally, the organic tertiary amine catalyst is triisopropylamine, N-dimethylisopropylamine or N-ethyldiisopropylamine;
the bisphenol type epoxy resin is bisphenol F type epoxy resin, bisphenol S type epoxy resin or bisphenol AF type epoxy resin;
the isocyanate is m-phenylene diisocyanate, 1, 4-cyclohexyl diisocyanate or 2, 4-toluene diisocyanate.
Optionally, the intermediate paint coating comprises the following components in parts by weight: 45-63 parts of compound epoxy resin, 18-25 parts of aluminum-titanium powder, 5-12 parts of diethylene glycol glycidyl ether, 5-8 parts of curing agent, 1-3 parts of dispersing agent and 0.5-1.5 parts of defoaming agent.
Optionally, the compound epoxy resin is formed by compounding epoxy resin E51 and epoxy resin E21, and the weight ratio of the epoxy resin E51 to the epoxy resin E21 is 1: (0.8-1.2).
Optionally, the top-coat paint comprises the following components in parts by weight: 40-58 parts of aliphatic epoxy resin, 8-12 parts of barium sulfate, 10-15 parts of aluminum oxide, 8-15 parts of trimethylolpropane triglycidyl ether, 7-10 parts of curing agent, 0.8-2 parts of dispersing agent and 0.4-1.2 parts of defoaming agent.
Optionally, the dispersing agent is polyethylene glycol, sodium dodecyl benzene sulfonate or dispersing agent MF;
the defoaming agent is fluorosilicone, polyoxypropylene glycerol ether or isooctanol diethyl hexanol;
the curing agent is polyamide curing agent or phenolic amine curing agent.
Optionally, in the sand blasting process of the step (1), the air pressure of the sand blasting device is 0.55-0.65MPa, and the sand blasting speed is 150-180m/s.
Optionally, in the high-pressure airless spraying method, the spraying distance is 280-350 mm, the spraying width is 200-320 mm, the spraying angle of the spray gun is 45-80 degrees, and the running speed of the spray gun is 60-80cm/s.
Optionally, the corrosion-resistant coating process of the earthing tank further comprises the step of degreasing the surface of the earthing tank before sand blasting and rust removal: firstly, cleaning the surface of the earthing tank with clear water, and then cleaning the surface of the earthing tank with isopropyl alcohol solution with mass fraction of 40-60wt% for 1-3 times after airing.
Benefits of the present application include, but are not limited to:
1. according to the anti-corrosion coating process of the earthing tank, the primer, the intermediate paint and the finish paint are sequentially sprayed on the surface of the earthing tank by a high-pressure airless spraying method, so that the coating utilization rate is high, the coating effect is good, the coating efficiency is improved, meanwhile, the environmental pollution is low, the paint mist is less in scattering, and the operation environment is improved; the primer is coated on the welding seam, so that contact force is provided between the welding seam and the primer, and a smooth and flat paint film is formed when paint is coated subsequently; the surface of the intermediate paint is polished, so that the number of defects such as pinholes, particles and the like in a paint film is reduced, and the adhesive force between the intermediate paint and the top paint is enhanced.
2. According to the anti-corrosion coating process of the earthing tank, the anti-corrosion performance of the modified epoxy resin in the primer coating is excellent, the hard and brittle performance of the epoxy resin is improved, the flexibility of a paint film is improved, meanwhile, the VOC is low, and the transportation and storage processes are safe; the lamellar conjugated structure of the graphene oxide can be stacked layer by layer in the paint film to form a compact isolation layer, so that the infiltration and permeation of diffusion of water, oxygen and ions to the paint film can be inhibited, the permeation path of a corrosive medium in the paint film can be increased, and a physical corrosion prevention effect can be achieved.
3. According to the anti-corrosion coating process of the earthing tank, the epoxy resin E51 and the epoxy resin E21 are compounded, so that the toughness and the adhesive force of a paint film are improved; the aluminum titanium powder mainly comprises silicate, wherein the silicate is a colloidal substance with a micropore structure, and anion groups or colloid groups after hydrolysis and cations form coordination bonds, so that a passivation film is formed, external water, salt and oxide are prevented from entering, and meanwhile, reactants can be adhered to a reaction interface due to the colloidal state, the adhesive force of a paint film is enhanced, and the reaction is prevented from further proceeding.
4. According to the anti-corrosion coating process of the earthing tank, the physical properties and weather resistance of a paint film can be improved by the aliphatic epoxy resin; the barium sulfate has good leveling property and dispersibility, can be used as a carrier of pigment particles in a system, so that the pigment can be highly dispersed, a paint film with uniform color is obtained, meanwhile, the mutual accumulation effect between the barium sulfate and aluminum oxide particles is compact, and the formed paint film has better acid resistance and salt spray resistance.
5. The anti-corrosion coating process of the earthing tank is simple to operate, and reduces the labor intensity of workers; the paint film and the earthing tank and the paint films of each layer have synergistic effect, so that the defects of a single paint film are overcome, the corrosion resistance and weather resistance of the earthing tank are improved, the pollution to the environment is reduced, and the coating is suitable for large-scale production and popularization, and has extremely high application value.
Detailed Description
The endpoints and any values of the ranges disclosed herein are not limited to the precise range or value, and are understood to encompass values approaching those ranges or values. For numerical ranges, one or more new numerical ranges may be found between the endpoints of each range, between the endpoint of each range and the individual point value, and between the individual point value, in combination with each other, and are to be considered as specifically disclosed herein.
The specific conditions are not noted in the examples and are carried out according to conventional conditions or conditions recommended by the manufacturer. The raw materials or instruments used are conventional products available commercially without identifying the manufacturer.
The following primer coating, intermediate coating and top coating are mixed to form a uniform solution.
The following relates to a high pressure airless spraying method, wherein the spraying distance is 280-350 mm, the spraying width is 200-320 mm, the spraying angle of a spray gun is 45-80 degrees, and the running speed of the spray gun is 60-80cm/s.
Example 1
An anti-corrosion coating process of a soil covering tank comprises the following steps of:
(1) Firstly, cleaning the surface of a soil covering tank with clear water, airing, and then cleaning the surface of the soil covering tank with an isopropyl alcohol solution with the mass fraction of 50wt% for 2 times;
(2) Sand blasting and rust removal are carried out on the surface of the earthing tank, the air pressure of a sand blasting device is controlled to be 0.6MPa, the sand blasting speed is 165m/s, the surface roughness Ra of the earthing tank is 85 mu m, the cleanliness Sa is 2.5 grade, then primer is coated on the welding seam, and the welding seam is flattened through sand paper;
(3) Spraying primer paint on the surface of the earthing tank by adopting a high-pressure airless spraying method, and curing for 2 hours at 55 ℃, wherein the thickness of the primer paint is 110 mu m;
the primer coating comprises the following components in parts by weight: 52 parts of modified epoxy resin, 20 parts of graphene oxide, 10 parts of polypropylene glycol diglycidyl ether, 8 parts of polyamide curing agent, 2 parts of polyethylene glycol and 1.2 parts of fluorosilicone;
the preparation method of the modified epoxy resin comprises the following steps: mixing m-phenylene diisocyanate and polytetrahydrofuran, and stirring at 30 ℃ for reaction for 1h to obtain polyurethane prepolymer; adding bisphenol F type epoxy resin and triisopropylamine, and stirring at 80 ℃ for reaction for 3 hours to obtain modified epoxy resin;
the weight ratio of the m-phenylene diisocyanate, the bisphenol F type epoxy resin and the polytetrahydrofuran is 1:2.7:4.2;
the addition amount of triisopropylamine is 6.5wt% of bisphenol F type epoxy resin;
(4) Spraying intermediate paint on the surface of the primer by adopting a high-pressure airless spraying method, curing for 1.2 hours at 40 ℃, polishing the surface of the intermediate paint by using sand paper, and removing polishing ash, wherein the thickness of the intermediate paint is 40 mu m;
the intermediate paint coating comprises the following components in parts by weight: 25 parts of epoxy resin E51, 25 parts of epoxy resin E21, 22 parts of aluminum titanium powder, 8 parts of diethylene glycol glycidyl ether, 6 parts of phenolic amine curing agent, 2 parts of sodium dodecyl benzene sulfonate and 1 part of polyoxypropylene glycerol ether;
(5) Spraying a finish paint on the surface of the intermediate paint by adopting a high-pressure airless spraying method, and curing for 25 hours at 28 ℃ to obtain a coated earthing tank, wherein the thickness of the finish paint is 50 mu m;
the finishing paint comprises the following components in parts by weight: 47 parts of aliphatic epoxy resin, 10 parts of barium sulfate, 12 parts of aluminum oxide, 11 parts of trimethylolpropane triglycidyl ether, 7-10 parts of polyamide curing agent, 1.4 parts of dispersing agent MF and 0.8 part of isooctanol diethyl hexanol.
Example 2
An anti-corrosion coating process of a soil covering tank comprises the following steps of:
(1) Firstly, cleaning the surface of a soil covering tank with clear water, airing, and then cleaning the surface of the soil covering tank with an isopropyl alcohol solution with the mass fraction of 40wt% for 3 times;
(2) Sand blasting and rust removal are carried out on the surface of the earthing tank, the air pressure of a sand blasting device is controlled to be 0.55MPa, the sand blasting speed is controlled to be 180m/s, the surface roughness Ra of the earthing tank is 75 mu m, the cleanliness Sa is 3.0 grade, then primer is smeared on a welding seam, and the welding seam is flattened through sand paper;
(3) Spraying primer paint on the surface of the earthing tank by adopting a high-pressure airless spraying method, and curing for 3 hours at 50 ℃, wherein the thickness of the primer paint is 100 mu m;
the primer coating comprises the following components in parts by weight: 40 parts of modified epoxy resin, 15 parts of graphene oxide, 8 parts of polypropylene glycol diglycidyl ether, 5 parts of phenolic aldehyde amine curing agent, 1 part of polyethylene glycol and 0.5 part of fluorosilicone;
the preparation method of the modified epoxy resin comprises the following steps: mixing 1, 4-cyclohexyl diisocyanate and polytetrahydrofuran, and stirring at 20 ℃ for reaction for 1.2 hours to obtain polyurethane prepolymer; adding bisphenol S-type epoxy resin and N, N-dimethyl isopropylamine, and stirring at 70 ℃ for reacting for 4 hours to obtain modified epoxy resin;
the weight ratio of 1, 4-cyclohexyl diisocyanate, bisphenol S epoxy resin and polytetrahydrofuran here is 1:2.4:3, a step of;
the addition amount of the N, N-dimethyl isopropylamine is 5wt% of bisphenol S type epoxy resin;
(4) Spraying intermediate paint on the surface of the primer by adopting a high-pressure airless spraying method, curing for 1.5 hours at 35 ℃, polishing the surface of the intermediate paint by using sand paper, and removing polishing ash, wherein the thickness of the intermediate paint is 30 mu m;
the intermediate paint coating comprises the following components in parts by weight: 25 parts of epoxy resin E51, 20 parts of epoxy resin E21, 18 parts of aluminum titanium powder, 5 parts of diethylene glycol glycidyl ether, 5 parts of polyamide curing agent, 1 part of sodium dodecyl benzene sulfonate and 0.5 part of polyoxypropylene glycerol ether;
(5) Spraying a finish paint on the surface of the intermediate paint by adopting a high-pressure airless spraying method, and curing for 30 hours at 25 ℃ to obtain a coated earthing tank, wherein the thickness of the finish paint is 40 mu m;
the finishing paint comprises the following components in parts by weight: 40 parts of aliphatic epoxy resin, 8 parts of barium sulfate, 10 parts of aluminum oxide, 8 parts of trimethylolpropane triglycidyl ether, 7 parts of phenolic amine curing agent, 0.8 part of dispersing agent MF and 0.4 part of isooctanol diethyl hexanol.
Example 3
An anti-corrosion coating process of a soil covering tank comprises the following steps of:
(1) Firstly, cleaning the surface of a soil covering tank with clear water, airing, and then cleaning the surface of the soil covering tank with an isopropanol solution with the mass fraction of 60wt% for 1 time;
(2) Sand blasting and rust removing are carried out on the surface of the earthing tank, the air pressure of a sand blasting device is controlled to be 0.65MPa, the sand blasting speed is controlled to be 150m/s, the surface roughness Ra of the earthing tank is 100 mu m, the cleanliness Sa is 2.5 grade, then primer is coated on a welding seam, and the welding seam is flattened through sand paper;
(3) Spraying primer paint on the surface of the earthing tank by adopting a high-pressure airless spraying method, and curing for 1h at 65 ℃, wherein the thickness of the primer paint is 120 mu m;
the primer coating comprises the following components in parts by weight: 65 parts of modified epoxy resin, 25 parts of graphene oxide, 12 parts of polypropylene glycol diglycidyl ether, 10 parts of polyamide curing agent, 3 parts of polyethylene glycol and 2 parts of fluorosilicone;
the preparation method of the modified epoxy resin comprises the following steps: mixing 2, 4-toluene diisocyanate and polytetrahydrofuran, and stirring at 40 ℃ for reaction for 0.5h to obtain polyurethane prepolymer; adding bisphenol AF type epoxy resin and N-ethyldiisopropylamine, and stirring at 90 ℃ for 2 hours to obtain modified epoxy resin;
the weight ratio of 2, 4-toluene diisocyanate, bisphenol AF epoxy resin and polytetrahydrofuran here is 1:3:5.8;
the addition amount of the N-ethyldiisopropylamine is 8wt% of bisphenol AF type epoxy resin;
(4) Spraying intermediate paint on the surface of the primer by adopting a high-pressure airless spraying method, curing for 0.8h at 45 ℃, polishing the surface of the intermediate paint by using sand paper, and removing polishing ash, wherein the thickness of the intermediate paint is 50 mu m;
the intermediate paint coating comprises the following components in parts by weight: 30 parts of epoxy resin E51, 33 parts of epoxy resin E21, 25 parts of aluminum titanium powder, 12 parts of diethylene glycol glycidyl ether, 8 parts of phenolic amine curing agent, 3 parts of sodium dodecyl benzene sulfonate and 1.5 parts of polyoxypropylene glycerol ether;
(5) Spraying a finish paint on the surface of the intermediate paint by adopting a high-pressure airless spraying method, and curing for 20 hours at 30 ℃ to obtain a coated earthing tank, wherein the thickness of the finish paint is 60 mu m;
the finishing paint comprises the following components in parts by weight: 58 parts of aliphatic epoxy resin, 12 parts of barium sulfate, 15 parts of aluminum oxide, 15 parts of trimethylolpropane triglycidyl ether, 10 parts of polyamide curing agent, 2 parts of dispersing agent MF and 1.2 parts of isooctanol diethyl hexanol.
Comparative example 1
The difference from example 1 is that: and (3) replacing the modified epoxy resin in the step (3) with bisphenol F type epoxy resin, and replacing graphene oxide with carbon black.
Comparative example 2
The difference from example 1 is that: the preparation method of the modified epoxy resin in the step (3) comprises the following steps: evenly mixing polytetrahydrofuran, bisphenol F type epoxy resin and triisopropylamine, and stirring at 80 ℃ for reaction for 3 hours to obtain the modified epoxy resin.
Comparative example 3
The difference from example 1 is that: and (3) replacing the bisphenol F type epoxy resin in the step (3) with dicyclopentadiene phenol epoxy resin.
Comparative example 4
The difference from example 1 is that: and (3) replacing epoxy resin E51 in the step (4) with epoxy resin E44, replacing epoxy resin E21 with epoxy resin E12, and replacing aluminum-titanium powder with micro silicon powder.
Comparative example 5
The difference from example 1 is that: the aliphatic epoxy resin in step (5) is replaced by an aromatic epoxy resin, and barium sulfate is not added.
Comparative example 6
The difference from example 1 is that: and (3) polishing the surface of the intermediate paint without sand paper in the step (4), and removing polishing ash.
Comparative example 7
The difference from example 1 is that: the isopropanol solution in step (1) is replaced by a sodium tripolyphosphate solution.
Test examples
The paint films prepared by the coating processes of examples 1 to 3 and comparative examples 1 to 7 were subjected to the following performance tests, and the results are shown in Table 1.
1. Adhesion force: the rating of the paint film adhesion was determined according to GB/T9286-1998.
2. Flexibility: the flexibility of the paint film was tested according to the GB/T1731-1993 standard and the minimum shaft diameter to bend over shaft rods of different diameters without causing damage to the paint film was recorded.
3. Impact properties: the impact resistance properties of the paint films were determined according to GB/T1732-1993 and recorded as the maximum height at which no damage to the paint film was caused.
4. Strong acid resistance: the detection was carried out according to the method described in GB/T9274-1988 under conditions of soaking in 50% HCl solution for 24 hours.
5. Saline-alkali resistance: the detection is carried out by adopting the method described in GB/T9274-1988, and the detection condition is that 50% NaOH solution is soaked for 24 hours.
TABLE 1
As can be seen from Table 1, the paint film prepared by the coating process of the embodiment of the invention has good flexibility, impact resistance, strong adhesion with the earthing tank, firmness and reliability, excellent corrosion resistance, and is not easy to be influenced by surrounding medium, thus providing durable protection for the earthing tank.
The foregoing is merely exemplary of the present application, and the scope of the present application is not limited to the specific embodiments, but is defined by the claims of the present application. Various modifications and changes may be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the technical ideas and principles of the present application should be included in the protection scope of the present application.
Claims (10)
1. The anti-corrosion coating process of the earthing tank is characterized by comprising the following steps of:
(1) Sand blasting and rust removing are carried out on the surface of the earthing tank, so that the roughness Ra of the earthing tank is 75-100 mu m, the cleanliness Sa is 2.5-3.0 grade, then priming paint is coated on the welding seam, and the earthing tank is flattened through sand paper;
(2) Spraying primer on the surface of the earthing tank by adopting a high-pressure airless spraying method, and curing for 1-3h at 50-65 ℃;
(3) Spraying intermediate paint on the surface of the primer by adopting a high-pressure airless spraying method, curing for 0.8-1.5h at 35-45 ℃, polishing the surface of the intermediate paint by using sand paper, and removing polishing ash;
(4) And spraying finishing paint on the surface of the intermediate paint by adopting a high-pressure airless spraying method, and curing for 20-30 hours at 25-30 ℃ to obtain the coated earthing tank.
2. The anticorrosive coating process for the earthing tank according to claim 1, wherein the thickness of the primer is 100-120 μm, the thickness of the intermediate paint is 30-50 μm, and the thickness of the top coat is 40-60 μm.
3. The anticorrosive coating process of the earthing tank according to claim 1, wherein the primer coating comprises the following components in parts by weight: 40-65 parts of modified epoxy resin, 15-25 parts of graphene oxide, 8-12 parts of polypropylene glycol diglycidyl ether, 5-10 parts of curing agent, 1-3 parts of dispersing agent and 0.5-2 parts of defoaming agent.
4. The anticorrosive coating process for a soil-covered tank according to claim 3, wherein the preparation method of the modified epoxy resin comprises the following steps: mixing isocyanate and polytetrahydrofuran, and stirring and reacting for 0.5-1.2h at 20-40 ℃ to obtain polyurethane prepolymer; adding bisphenol epoxy resin and organic tertiary amine catalyst, stirring and reacting for 2-4h at 70-90 ℃ to obtain modified epoxy resin;
wherein, the weight ratio of isocyanate, bisphenol type epoxy resin and polytetrahydrofuran is 1: (2.4-3): (3-5.8);
the addition amount of the organic tertiary amine catalyst is 5-8wt% of the bisphenol type epoxy resin.
5. The anticorrosive coating process of the earthing tank according to claim 1, wherein the intermediate paint coating comprises the following components in parts by weight: 45-63 parts of compound epoxy resin, 18-25 parts of aluminum-titanium powder, 5-12 parts of diethylene glycol glycidyl ether, 5-8 parts of curing agent, 1-3 parts of dispersing agent and 0.5-1.5 parts of defoaming agent.
6. The anticorrosive coating process of the earthing tank according to claim 5, wherein the compound epoxy resin is formed by compounding epoxy resin E51 and epoxy resin E21, and the weight ratio of the epoxy resin E51 to the epoxy resin E21 is 1: (0.8-1.2).
7. The anticorrosive coating process of the earthing tank according to claim 1, wherein the top-coat paint comprises the following components in parts by weight: 40-58 parts of aliphatic epoxy resin, 8-12 parts of barium sulfate, 10-15 parts of aluminum oxide, 8-15 parts of trimethylolpropane triglycidyl ether, 7-10 parts of curing agent, 0.8-2 parts of dispersing agent and 0.4-1.2 parts of defoaming agent.
8. The anticorrosive coating process for the earth covered tank according to any one of claims 3, 5 or 7, wherein the dispersant is polyethylene glycol, sodium dodecylbenzene sulfonate or dispersant MF;
the defoaming agent is fluorosilicone, polyoxypropylene glycerol ether or isooctanol diethyl hexanol;
the curing agent is polyamide curing agent or phenolic amine curing agent.
9. The anticorrosive coating process for the earthing tank according to claim 1, wherein in the blasting process of step (1), the air pressure of the blasting means is 0.55-0.65MPa and the blasting speed is 150-180m/s.
10. The corrosion protection coating process for an earth-covered tank of claim 1, further comprising the step of degreasing the surface of the earth-covered tank prior to sand blasting: firstly, cleaning the surface of the earthing tank with clear water, and then cleaning the surface of the earthing tank with isopropyl alcohol solution with mass fraction of 40-60wt% for 1-3 times after airing.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106311580A (en) * | 2016-08-16 | 2017-01-11 | 天津中德工程设计有限公司 | Modified aqueous paint coating process for oil tank for petroleum cave depot/earthing storeroom |
| CN108997892A (en) * | 2018-09-07 | 2018-12-14 | 海洋化工研究院有限公司 | A kind of graphene anticorrosive paint and preparation method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106311580A (en) * | 2016-08-16 | 2017-01-11 | 天津中德工程设计有限公司 | Modified aqueous paint coating process for oil tank for petroleum cave depot/earthing storeroom |
| CN108997892A (en) * | 2018-09-07 | 2018-12-14 | 海洋化工研究院有限公司 | A kind of graphene anticorrosive paint and preparation method |
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| Title |
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| 李子东等: "《钢结构制造与安装》", vol. 1, 中国轻工业出版社, pages: 292 - 294 * |
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