CN112143366B - Treatment method for corrosion-resistant steel plate bin base - Google Patents
Treatment method for corrosion-resistant steel plate bin base Download PDFInfo
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- CN112143366B CN112143366B CN202011030835.3A CN202011030835A CN112143366B CN 112143366 B CN112143366 B CN 112143366B CN 202011030835 A CN202011030835 A CN 202011030835A CN 112143366 B CN112143366 B CN 112143366B
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/04—Polyurethanes
- C09D175/08—Polyurethanes from polyethers
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- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/002—Pretreatement
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/50—Multilayers
- B05D7/52—Two layers
- B05D7/54—No clear coat specified
- B05D7/544—No clear coat specified the first layer is let to dry at least partially before applying the second layer
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- C09D4/00—Coating compositions, e.g. paints, varnishes or lacquers, based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; Coating compositions, based on monomers of macromolecular compounds of groups C09D183/00 - C09D183/16
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- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
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- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
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- C09D7/60—Additives non-macromolecular
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- B—PERFORMING OPERATIONS; TRANSPORTING
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Abstract
The invention discloses a treatment method of a corrosion-resistant steel plate bin base; relates to the technical field of steel plate cabin equipment, comprising the following steps: (1) cleaning and polishing; (2) pretreating a steel plate bin base; (3) preparing a coating solution; (4) according to the method, a layer of compact and uniform covering film can be formed after the pretreatment liquid is coated on the surface of the steel plate bin base, and the covering film formed on the surface of the steel plate bin base by the pretreatment liquid is thick and not easy to damage.
Description
Technical Field
The invention belongs to the technical field of steel plate bin equipment, and particularly relates to a treatment method of a corrosion-resistant steel plate bin base.
Background
The steel plate bin is mainly used for storing powder and granular materials such as cement, fly ash, slag micro powder, clinker, grain and the like.
The steel plate bin technology in China is applied and developed in the grain industry relatively late. In 1982, the flood farm in Heilongjiang province introduced galvanized corrugated plate assembled steel plate bins from the United states, which are the earliest modern steel plate bin group in China. In the 80 s of the 20 th century, the construction of steel plate warehouses in China has been unprecedentedly developed. The technical scheme is that a complete set of technology and a special equipment production line of an American assembled steel plate bin are introduced and absorbed by a spring welcoming machinery factory in Heilongjiang province, innovation and development are carried out on the basis of digestion and absorption according to the foreign advanced technology, design software and manufacturing standards, the assembled steel plate bin is produced, manufactured and installed in large batch, the strength, performance and safety of the steel plate bin are enabled to be reliable, the steel plate bin is taken as a product to be exported in large quantity, the steel plate bin represents the international level of production, manufacturing and installation of the steel plate bin in China at present, and the pilot for manufacturing and installing the steel plate bin is provided.
The steel plate storehouse can store granular, powdery, grain and oil, food, brewage, coal, building materials and the like, and is widely applied to the fields of industry and agriculture, urban and rural areas, environmental protection industry and the like.
However, the environment that the steel plate storehouse base contacted is comparatively complicated, after long-time, the surface corrosion phenomenon very easily appears, and after the corrosion of long-time large tracts of land, can destroy the interior storage environment of steel plate storehouse gradually, leads to inside storage article to appear putrefacing, consequently, needs carry out certain protection to the steel plate storehouse base and handle.
Disclosure of Invention
The invention aims to provide a treatment method of a corrosion-resistant steel plate bin base, which aims to overcome the defects in the prior art.
The technical scheme adopted by the invention is as follows:
a treatment method for a corrosion-resistant steel plate bin base comprises the following steps:
(1) cleaning and polishing:
cleaning a steel plate bin base by using acetone to remove surface oil stains, then cleaning by using an ethanol solution with the mass fraction of 30%, airing, and then respectively polishing by using abrasive paper with different meshes to obtain a polished steel plate bin base;
(2) pretreatment of a steel plate bin base:
preparing a pretreatment solution: sequentially adding a silane coupling agent, maleic anhydride, strontium chloride, absolute ethyl alcohol and deionized water into a reaction kettle, heating to 50 ℃, and stirring for 30min to obtain a pretreatment solution;
uniformly coating the pretreatment liquid on the surface of the steel plate bin base, and then drying at the constant temperature of 40-45 DEG C
(3) Preparing a coating solution:
uniformly mixing polytetramethylene ether glycol and isopropanol, and performing vacuum drying treatment for 40min to obtain a dry alcohol mixture;
adding a dry alcohol mixture into a reaction kettle, then adding hexamethylene diisocyanate, isophorone diisocyanate and dibutyl tin diisooctoate, then heating to 78-85 ℃, stirring for reaction for 1.5 hours, then diluting with acetone to twice the volume of an original system, then adding 1, 4-butanediol, adjusting the temperature to 50 ℃, carrying out heat preservation reaction for 4 hours, then adding ethylenediamine sodium ethanesulfonate and a carbon nano tube, stirring at the rotating speed of 3500r/min for 1 hour, stopping, standing for 10 minutes, and then carrying out negative pressure acetone removal to obtain a coating solution;
(4) coating treatment;
and (3) uniformly spraying the prepared coating liquid on the surface of the base of the pretreated steel plate bin, then placing the base in a constant-temperature drying chamber for drying and curing, then removing the base, and naturally cooling the base to room temperature.
After the pretreated carbon nano tube is introduced, the integral strength of the formed covering film is increased, the dispersion of the pretreated carbon nano tube is improved after the pretreated carbon nano tube is added into a coating liquid system, under the action of external stress, on one hand, the pretreated carbon nano tube bears certain impact load, on the other hand, certain constraint action is exerted on polymer macromolecules to limit the slippage of the polymer macromolecules, the mechanical property of the covering film is obviously improved, meanwhile, active groups on the surface of the carbon nano tube are combined with macromolecule chains, certain constraint action is also exerted on the macromolecule chains, the densification of the covering film is improved, and the barrier action on corrosion factors is improved;
the different-mesh sand paper is ground by sequentially adopting 300-mesh, 600-mesh and 1200-mesh sand paper;
wherein the 300-mesh sand paper is used for grinding for 20 min;
polishing with 600-mesh sand paper for 35 min;
and grinding the sand paper with the size of 1200 meshes for 1 hour.
The silane coupling agent is a silane coupling agent KH 550;
the silane coupling agent, maleic anhydride, strontium chloride, absolute ethyl alcohol and deionized water are in parts by weight: 8-11: 1.5-2: 0.012-0.015:30-35:60-70.
The mass ratio of the polytetramethylene ether glycol to the isopropanol is 5: 1-1.2.
The vacuum drying temperature is 100 ℃.
The weight parts of the dry alcohol mixture, hexamethylene diisocyanate, isophorone diisocyanate and dibutyl tin diisooctoate are as follows: 40-45:18-22:12-15:0.2-0.5.
The mass ratio of the dry alcohol mixture to the 1, 4-butanediol to the ethylene diamine ethyl sodium sulfonate to the carbon nano tube is as follows: 5:1:6.
The carbon nano tube is pretreated:
uniformly dispersing carbon nanotubes into an ethanol solution with the mass fraction of 5%, adding lanthanum maleate and diethylamide, stirring for reacting for 2 hours, then carrying out suction filtration, washing and drying to constant weight to obtain the nano-carbon nanotube material;
the mixing mass ratio of the carbon nano tube to the ethanol solution is 1: 5;
the mass ratio of the carbon nano tube to the lanthanum maleate to the diethylamide is 10: 3: 1.
the drying and curing temperature in the constant temperature chamber is 88 ℃, and the curing time is 2 hours.
Has the advantages that:
according to the method, a layer of compact and uniform covering film can be formed after the pretreatment liquid is coated on the surface of the steel plate bin base, the covering film formed on the surface of the steel plate bin base by the pretreatment liquid is thick and not easy to damage, after a layer of inner covering film is formed on the surface of the steel plate bin, the coating liquid is coated, a layer of outer covering film can be formed, and the outer covering film and the inner covering film can be combined through active groups to form chemical bonds, so that the bonding force between the outer covering film and the inner covering film is greatly improved, the steel plate bin base can be protected in all aspects through the inner covering film and the outer covering film, the corrosion of oxygen, water, corrosive ions and the like to the steel plate bin is prevented, and the service life of the steel plate bin is prolonged.
When lanthanum maleate is not added into the coating liquid, after the base of the steel plate bin is coated, the corrosion resistance of the formed outer covering film is reduced to a certain extent, because the carbon nano tube and the lanthanum maleate are introduced, the corrosion resistance of the outer covering film can be synergistically improved, the carbon nano tube and the lanthanum maleate are uniformly dispersed in an outer covering film system and are connected with an organic polymer molecular chain through groups to form uniform dispersion points, and the compactness of the outer covering film is greatly improved.
Detailed Description
A treatment method for a corrosion-resistant steel plate bin base comprises the following steps:
(1) cleaning and polishing:
cleaning a steel plate bin base by using acetone to remove surface oil stains, then cleaning by using an ethanol solution with the mass fraction of 30%, airing, and then respectively polishing by using abrasive paper with different meshes to obtain a polished steel plate bin base;
(2) pretreatment of a steel plate bin base:
preparing a pretreatment solution: sequentially adding a silane coupling agent, maleic anhydride, strontium chloride, absolute ethyl alcohol and deionized water into a reaction kettle, heating to 50 ℃, and stirring for 30min to obtain a pretreatment solution;
uniformly coating the pretreatment liquid on the surface of the steel plate bin base, and then drying at the constant temperature of 40-45 DEG C
(3) Preparing a coating solution:
uniformly mixing polytetramethylene ether glycol and isopropanol, and performing vacuum drying treatment for 40min to obtain a dry alcohol mixture;
adding a dry alcohol mixture into a reaction kettle, then adding hexamethylene diisocyanate, isophorone diisocyanate and dibutyl tin diisooctoate, then heating to 78-85 ℃, stirring for reaction for 1.5 hours, then diluting with acetone to twice the volume of an original system, then adding 1, 4-butanediol, adjusting the temperature to 50 ℃, carrying out heat preservation reaction for 4 hours, then adding ethylenediamine sodium ethanesulfonate and a carbon nano tube, stirring at the rotating speed of 3500r/min for 1 hour, stopping, standing for 10 minutes, and then carrying out negative pressure acetone removal to obtain a coating solution;
isophorone diisocyanate;
the molecular formula is as follows: C12H18N2O2;
molecular weight: 222.29;
the content is as follows: 99 percent;
packaging: 200 kg/barrel;
the main components are as follows: the content is 99.0 percent; the content of NCO group is more than or equal to 37.5 percent;
appearance and properties: a colorless to yellowish liquid;
relative density (water = 1): 1.0615, respectively;
solubility: miscible in esters, ketones, ethers, hydrocarbons;
(4) coating treatment;
and (3) uniformly spraying the prepared coating liquid on the surface of the base of the pretreated steel plate bin, then placing the base in a constant-temperature drying chamber for drying and curing, then removing the base, and naturally cooling the base to room temperature.
The different-mesh sand paper is ground by sequentially adopting 300-mesh, 600-mesh and 1200-mesh sand paper;
wherein the 300-mesh sand paper is used for grinding for 20 min;
polishing with 600-mesh sand paper for 35 min;
and grinding the sand paper with the size of 1200 meshes for 1 hour.
The silane coupling agent is a silane coupling agent KH 550;
the silane coupling agent, maleic anhydride, strontium chloride, absolute ethyl alcohol and deionized water are in parts by weight: 8-11: 1.5-2: 0.012-0.015:30-35:60-70.
The mass ratio of the polytetramethylene ether glycol to the isopropanol is 5: 1-1.2.
The vacuum drying temperature is 100 ℃.
The weight parts of the dry alcohol mixture, hexamethylene diisocyanate, isophorone diisocyanate and dibutyl tin diisooctoate are as follows: 40-45:18-22:12-15:0.2-0.5.
The mass ratio of the dry alcohol mixture to the 1, 4-butanediol to the ethylene diamine ethyl sodium sulfonate to the carbon nano tube is as follows: 5:1:6.
The carbon nano tube is pretreated:
uniformly dispersing carbon nanotubes into an ethanol solution with the mass fraction of 5%, adding lanthanum maleate and diethylamide, stirring for reacting for 2 hours, then carrying out suction filtration, washing and drying to constant weight to obtain the nano-carbon nanotube material;
the mixing mass ratio of the carbon nano tube to the ethanol solution is 1: 5;
the mass ratio of the carbon nano tube to the lanthanum maleate to the diethylamide is 10: 3: 1.
the drying and curing temperature in the constant temperature chamber is 88 ℃, and the curing time is 2 hours.
The following will clearly and completely describe the technical solutions of the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
A treatment method for a corrosion-resistant steel plate bin base comprises the following steps:
(1) cleaning and polishing:
cleaning a steel plate bin base by using acetone to remove surface oil stains, then cleaning by using an ethanol solution with the mass fraction of 30%, airing, and then respectively polishing by using abrasive paper with different meshes to obtain a polished steel plate bin base; the different-mesh sand paper is ground by sequentially adopting 300-mesh, 600-mesh and 1200-mesh sand paper; wherein the 300-mesh sand paper is used for grinding for 20 min; polishing with 600-mesh sand paper for 35 min; and grinding the sand paper with the size of 1200 meshes for 1 hour.
(2) Pretreatment of a steel plate bin base:
preparing a pretreatment solution: sequentially adding a silane coupling agent, maleic anhydride, strontium chloride, absolute ethyl alcohol and deionized water into a reaction kettle, heating to 50 ℃, and stirring for 30min to obtain a pretreatment solution;
uniformly coating the pretreatment liquid on the surface of the steel plate bin base, and then placing the steel plate bin base in a constant-temperature drying chamber at 40 ℃ for drying treatment to obtain a pretreated steel plate bin base; the silane coupling agent is a silane coupling agent KH 550; the silane coupling agent, maleic anhydride, strontium chloride, absolute ethyl alcohol and deionized water are in parts by weight: 8: 1.5: 0.012:30:60. The quality of the polytetramethylene ether glycol and the isopropanol
(3) Preparing a coating solution:
uniformly mixing polytetramethylene ether glycol and isopropanol, and performing vacuum drying treatment for 40min to obtain a dry alcohol mixture;
adding a dry alcohol mixture into a reaction kettle, then adding hexamethylene diisocyanate, isophorone diisocyanate and dibutyl tin diisooctoate, then heating to 78 ℃, stirring for reaction for 1.5 hours, then diluting with acetone to twice the volume of an original system, then adding 1, 4-butanediol, adjusting the temperature to 50 ℃, carrying out heat preservation reaction for 4 hours, then adding ethylenediamine sodium ethanesulfonate and a carbon nano tube, stirring at a rotating speed of 3500r/min for 1 hour, stopping, standing for 10 minutes, and then carrying out negative pressure acetone removal to obtain a coating solution; the vacuum drying temperature is 100 ℃. The weight parts of the dry alcohol mixture, hexamethylene diisocyanate, isophorone diisocyanate and dibutyl tin diisooctoate are as follows: 40:18:12:0.2. The mass ratio of the dry alcohol mixture to the 1, 4-butanediol to the ethylene diamine ethyl sodium sulfonate to the carbon nano tube is as follows: 5:1:6. The carbon nano tube is pretreated: uniformly dispersing carbon nanotubes into an ethanol solution with the mass fraction of 5%, adding lanthanum maleate and diethylamide, stirring for reacting for 2 hours, then carrying out suction filtration, washing and drying to constant weight to obtain the nano-carbon nanotube material; the mixing mass ratio of the carbon nano tube to the ethanol solution is 1: 5; the mass ratio of the carbon nano tube to the lanthanum maleate to the diethylamide is 10: 3: 1.
(4) coating treatment;
and (3) uniformly spraying the prepared coating liquid on the surface of the base of the pretreated steel plate bin, then placing the base in a constant-temperature drying chamber for drying and curing, then removing the base, and naturally cooling the base to room temperature. The drying and curing temperature in the constant temperature chamber is 88 ℃, and the curing time is 2 hours.
Example 2
A treatment method for a corrosion-resistant steel plate bin base comprises the following steps:
(1) cleaning and polishing:
cleaning a steel plate bin base by using acetone to remove surface oil stains, then cleaning by using an ethanol solution with the mass fraction of 30%, airing, and then respectively polishing by using abrasive paper with different meshes to obtain a polished steel plate bin base; the different-mesh sand paper is ground by sequentially adopting 300-mesh, 600-mesh and 1200-mesh sand paper; wherein the 300-mesh sand paper is used for grinding for 20 min; polishing with 600-mesh sand paper for 35 min; and grinding the sand paper with the size of 1200 meshes for 1 hour.
(2) Pretreatment of a steel plate bin base:
preparing a pretreatment solution: sequentially adding a silane coupling agent, maleic anhydride, strontium chloride, absolute ethyl alcohol and deionized water into a reaction kettle, heating to 50 ℃, and stirring for 30min to obtain a pretreatment solution;
uniformly coating the pretreatment liquid on the surface of the steel plate bin base, and then placing the steel plate bin base in a constant-temperature drying chamber at 40-45 ℃ for drying treatment to obtain a pretreated steel plate bin base; the silane coupling agent is a silane coupling agent KH 550; the silane coupling agent, maleic anhydride, strontium chloride, absolute ethyl alcohol and deionized water are in parts by weight: 11: 2: 0.015:35:70. The polytetramethylene ether glycol and the isopropanol
(3) Preparing a coating solution:
uniformly mixing polytetramethylene ether glycol and isopropanol, and performing vacuum drying treatment for 40min to obtain a dry alcohol mixture;
adding a dry alcohol mixture into a reaction kettle, then adding hexamethylene diisocyanate, isophorone diisocyanate and dibutyl tin diisooctoate, then heating to 85 ℃, stirring for reaction for 1.5 hours, then diluting with acetone to twice the volume of an original system, then adding 1, 4-butanediol, adjusting the temperature to 50 ℃, carrying out heat preservation reaction for 4 hours, then adding ethylenediamine sodium ethanesulfonate and a carbon nano tube, stirring at a rotating speed of 3500r/min for 1 hour, stopping, standing for 10 minutes, and then carrying out negative pressure acetone removal to obtain a coating solution; the vacuum drying temperature is 100 ℃. The weight parts of the dry alcohol mixture, hexamethylene diisocyanate, isophorone diisocyanate and dibutyl tin diisooctoate are as follows: 45:22:15:0.5. The mass ratio of the dry alcohol mixture to the 1, 4-butanediol to the ethylene diamine ethyl sodium sulfonate to the carbon nano tube is as follows: 5:1:6. The carbon nano tube is pretreated: uniformly dispersing carbon nanotubes into an ethanol solution with the mass fraction of 5%, adding lanthanum maleate and diethylamide, stirring for reacting for 2 hours, then carrying out suction filtration, washing and drying to constant weight to obtain the nano-carbon nanotube material; the mixing mass ratio of the carbon nano tube to the ethanol solution is 1: 5; the mass ratio of the carbon nano tube to the lanthanum maleate to the diethylamide is 10: 3: 1.
(4) coating treatment;
and (3) uniformly spraying the prepared coating liquid on the surface of the base of the pretreated steel plate bin, then placing the base in a constant-temperature drying chamber for drying and curing, then removing the base, and naturally cooling the base to room temperature. The drying and curing temperature in the constant temperature chamber is 88 ℃, and the curing time is 2 hours.
Example 3
A treatment method for a corrosion-resistant steel plate bin base comprises the following steps:
(1) cleaning and polishing:
cleaning a steel plate bin base by using acetone to remove surface oil stains, then cleaning by using an ethanol solution with the mass fraction of 30%, airing, and then respectively polishing by using abrasive paper with different meshes to obtain a polished steel plate bin base; the different-mesh sand paper is ground by sequentially adopting 300-mesh, 600-mesh and 1200-mesh sand paper; wherein the 300-mesh sand paper is used for grinding for 20 min; polishing with 600-mesh sand paper for 35 min; and grinding the sand paper with the size of 1200 meshes for 1 hour.
(2) Pretreatment of a steel plate bin base:
preparing a pretreatment solution: sequentially adding a silane coupling agent, maleic anhydride, strontium chloride, absolute ethyl alcohol and deionized water into a reaction kettle, heating to 50 ℃, and stirring for 30min to obtain a pretreatment solution;
uniformly coating the pretreatment liquid on the surface of the steel plate bin base, and then placing the steel plate bin base in a constant-temperature drying chamber at 41 ℃ for drying treatment to obtain a pretreated steel plate bin base; the silane coupling agent is a silane coupling agent KH 550; the silane coupling agent, maleic anhydride, strontium chloride, absolute ethyl alcohol and deionized water are in parts by weight: 8-11: 1.6: 0.013:32:65. The polytetramethylene ether glycol and the isopropanol
(3) Preparing a coating solution:
uniformly mixing polytetramethylene ether glycol and isopropanol, and performing vacuum drying treatment for 40min to obtain a dry alcohol mixture;
adding a dry alcohol mixture into a reaction kettle, then adding hexamethylene diisocyanate, isophorone diisocyanate and dibutyl tin diisooctoate, then heating to 79 ℃, stirring for reaction for 1.5 hours, then diluting with acetone to twice the volume of an original system, then adding 1, 4-butanediol, adjusting the temperature to 50 ℃, carrying out heat preservation reaction for 4 hours, then adding ethylenediamine sodium ethanesulfonate and a carbon nano tube, stirring at a rotating speed of 3500r/min for 1 hour, stopping, standing for 10 minutes, and then carrying out negative pressure acetone removal to obtain a coating solution; the vacuum drying temperature is 100 ℃. The weight parts of the dry alcohol mixture, hexamethylene diisocyanate, isophorone diisocyanate and dibutyl tin diisooctoate are as follows: 41:20:13:0.3. The mass ratio of the dry alcohol mixture to the 1, 4-butanediol to the ethylene diamine ethyl sodium sulfonate to the carbon nano tube is as follows: 5:1:6. The carbon nano tube is pretreated: uniformly dispersing carbon nanotubes into an ethanol solution with the mass fraction of 5%, adding lanthanum maleate and diethylamide, stirring for reacting for 2 hours, then carrying out suction filtration, washing and drying to constant weight to obtain the nano-carbon nanotube material; the mixing mass ratio of the carbon nano tube to the ethanol solution is 1: 5; the mass ratio of the carbon nano tube to the lanthanum maleate to the diethylamide is 10: 3: 1.
(4) coating treatment;
and (3) uniformly spraying the prepared coating liquid on the surface of the base of the pretreated steel plate bin, then placing the base in a constant-temperature drying chamber for drying and curing, then removing the base, and naturally cooling the base to room temperature. The drying and curing temperature in the constant temperature chamber is 88 ℃, and the curing time is 2 hours.
Example 4
A treatment method for a corrosion-resistant steel plate bin base comprises the following steps:
(1) cleaning and polishing:
cleaning a steel plate bin base by using acetone to remove surface oil stains, then cleaning by using an ethanol solution with the mass fraction of 30%, airing, and then respectively polishing by using abrasive paper with different meshes to obtain a polished steel plate bin base; the different-mesh sand paper is ground by sequentially adopting 300-mesh, 600-mesh and 1200-mesh sand paper; wherein the 300-mesh sand paper is used for grinding for 20 min; polishing with 600-mesh sand paper for 35 min; and grinding the sand paper with the size of 1200 meshes for 1 hour.
(2) Pretreatment of a steel plate bin base:
preparing a pretreatment solution: sequentially adding a silane coupling agent, maleic anhydride, strontium chloride, absolute ethyl alcohol and deionized water into a reaction kettle, heating to 50 ℃, and stirring for 30min to obtain a pretreatment solution;
uniformly coating the pretreatment liquid on the surface of the steel plate bin base, and then placing the steel plate bin base in a constant-temperature drying chamber at 42 ℃ for drying treatment to obtain a pretreated steel plate bin base; the silane coupling agent is a silane coupling agent KH 550; the silane coupling agent, maleic anhydride, strontium chloride, absolute ethyl alcohol and deionized water are in parts by weight: 10: 1.8: 0.014:33:68. The polytetramethylene ether glycol and the isopropanol
(3) Preparing a coating solution:
uniformly mixing polytetramethylene ether glycol and isopropanol, and performing vacuum drying treatment for 40min to obtain a dry alcohol mixture;
adding a dry alcohol mixture into a reaction kettle, then adding hexamethylene diisocyanate, isophorone diisocyanate and dibutyl tin diisooctoate, then heating to 81 ℃, stirring for reaction for 1.5 hours, then diluting with acetone to twice the volume of an original system, then adding 1, 4-butanediol, adjusting the temperature to 50 ℃, carrying out heat preservation reaction for 4 hours, then adding ethylenediamine sodium ethanesulfonate and a carbon nano tube, stirring at a rotating speed of 3500r/min for 1 hour, stopping, standing for 10 minutes, and then carrying out negative pressure acetone removal to obtain a coating solution; the vacuum drying temperature is 100 ℃. The weight parts of the dry alcohol mixture, hexamethylene diisocyanate, isophorone diisocyanate and dibutyl tin diisooctoate are as follows: 42:19:14:0.3. The mass ratio of the dry alcohol mixture to the 1, 4-butanediol to the ethylene diamine ethyl sodium sulfonate to the carbon nano tube is as follows: 5:1:6. The carbon nano tube is pretreated: uniformly dispersing carbon nanotubes into an ethanol solution with the mass fraction of 5%, adding lanthanum maleate and diethylamide, stirring for reacting for 2 hours, then carrying out suction filtration, washing and drying to constant weight to obtain the nano-carbon nanotube material; the mixing mass ratio of the carbon nano tube to the ethanol solution is 1: 5; the mass ratio of the carbon nano tube to the lanthanum maleate to the diethylamide is 10: 3: 1.
(4) coating treatment;
and (3) uniformly spraying the prepared coating liquid on the surface of the base of the pretreated steel plate bin, then placing the base in a constant-temperature drying chamber for drying and curing, then removing the base, and naturally cooling the base to room temperature. The drying and curing temperature in the constant temperature chamber is 88 ℃, and the curing time is 2 hours.
Measuring the thickness of the surface film of the base of the pretreated steel plate bin by using a Tencor P6 type film thickness meter (5 films are measured in each group, and the average value is taken);
TABLE 1
Comparative example 1: the differences from example 1 are: maleic anhydride is not added into the pretreatment liquid;
as can be seen from the table 1, after the pretreatment liquid is coated on the surface of the steel plate bin base in the method, a layer of compact and uniform covering film can be formed, the thickness of the covering film formed on the surface of the steel plate bin base by the pretreatment liquid is thick and is not easy to damage, after a layer of inner covering film is formed on the surface of the steel plate bin, the coating liquid is coated, an outer covering film can be formed, and active groups can be combined between the outer covering film and the inner covering film to form chemical bonds, so that the bonding force between the outer covering film and the inner covering film is greatly improved.
Corrosion resistance test
Taking 5 groups of steel sheets made of steel plate bin base materials with the same specification, processing by the method of embodiment 1, respectively putting the steel sheets into different corrosion media to soak for a period of time, taking out, and comparing:
TABLE 2
As can be seen from Table 2, the corrosion resistance of the steel plate silo base treated by the method of the invention is greatly improved.
Taking 5 groups of steel sheets made of steel plate bin base materials with the same specification, processing by the method of the embodiment 2, respectively putting the steel sheets into different corrosion media to soak for a period of time, taking out, and comparing:
TABLE 3
As can be seen from Table 3, the corrosion resistance of the steel plate silo base treated by the method of the invention is greatly improved.
Taking 5 groups of steel sheets made of the steel plate bin base material with the same specification, processing by the method of the embodiment 3, respectively putting the steel sheets into different corrosion media to soak for a period of time, taking out, and comparing:
TABLE 4
As can be seen from Table 4, the corrosion resistance of the steel plate silo base treated by the method of the invention is greatly improved.
Taking 5 groups of steel sheets made of the steel plate bin base material with the same specification, processing by the method of embodiment 4, respectively putting the steel sheets into different corrosion media to soak for a period of time, taking out, and comparing:
TABLE 5
As can be seen from Table 5, the corrosion resistance of the steel plate silo base treated by the method of the invention is greatly improved.
Taking 5 groups of steel sheets made of steel plate bin base materials with the same specification, treating the steel sheets by adopting the method of the comparative example 2, respectively putting the steel sheets into different corrosion media to soak for a period of time, taking out, and comparing:
TABLE 6
Comparative example 2: the difference from the embodiment 4 is that the carbon nano-tube in the coating liquid is not pretreated;
it can be seen from table 6 that the corrosion resistance of the outer coating film formed after the carbon nanotubes in the coating solution are coated on the steel plate bin base without being pretreated is reduced to a certain extent, because the corrosion resistance of the outer coating film can be synergistically improved by introducing the pretreated carbon nanotubes, the carbon nanotubes and the outer coating film are uniformly dispersed in an outer coating film system and are connected with organic polymer molecular chains through groups to form uniform dispersion points, and the compactness of the outer coating film is greatly improved.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention, and the present invention is not limited to the illustrated embodiments, and all the modifications and equivalents of the embodiments may be made without departing from the spirit of the present invention.
Claims (1)
1. The method for treating the corrosion-resistant steel plate bin base is characterized by comprising the following steps of:
(1) cleaning and polishing:
cleaning a steel plate bin base by using acetone to remove surface oil stains, then cleaning by using an ethanol solution with the mass fraction of 30%, airing, and then respectively polishing by using abrasive paper with different meshes to obtain a polished steel plate bin base;
(2) pretreatment of a steel plate bin base:
preparing a pretreatment solution: sequentially adding a silane coupling agent, maleic anhydride, strontium chloride, absolute ethyl alcohol and deionized water into a reaction kettle, heating to 50 ℃, and stirring for 30min to obtain a pretreatment solution;
uniformly coating the pretreatment liquid on the surface of the steel plate bin base, and then placing the steel plate bin base in a constant-temperature drying chamber at 40-45 ℃ for drying treatment to obtain a pretreated steel plate bin base;
(3) preparing a coating solution:
uniformly mixing polytetramethylene ether glycol and isopropanol, and performing vacuum drying treatment for 40min to obtain a dry alcohol mixture;
adding a dry alcohol mixture into a reaction kettle, then adding hexamethylene diisocyanate, isophorone diisocyanate and dibutyl tin diisooctoate, then heating to 78-85 ℃, stirring for reaction for 1.5 hours, then diluting with acetone to twice the volume of an original system, then adding 1, 4-butanediol, adjusting the temperature to 50 ℃, carrying out heat preservation reaction for 4 hours, then adding ethylenediamine sodium ethanesulfonate and a carbon nano tube, stirring at the rotating speed of 3500r/min for 1 hour, stopping, standing for 10 minutes, and then carrying out negative pressure acetone removal to obtain a coating solution;
(4) coating treatment;
uniformly spraying the prepared coating liquid on the surface of a base of a pretreated steel plate bin, then placing the base in a constant-temperature drying chamber for drying and curing, then removing the base, and naturally cooling the base to room temperature; the sanding with different mesh numbers is sequentially performed by 300-mesh, 600-mesh and 1200-mesh sandpaper;
wherein the 300-mesh sand paper is used for grinding for 20 min;
polishing with 600-mesh sand paper for 35 min;
polishing the 1200-mesh sand paper for 1 hour; the silane coupling agent is a silane coupling agent KH 550;
the silane coupling agent, maleic anhydride, strontium chloride, absolute ethyl alcohol and deionized water are in parts by weight: 8-11: 1.5-2: 0.012-0.015:30-35: 60-70; the mass ratio of the polytetramethylene ether glycol to the isopropanol is 5: 1-1.2; the vacuum drying temperature is 100 ℃; the weight parts of the dry alcohol mixture, hexamethylene diisocyanate, isophorone diisocyanate and dibutyl tin diisooctoate are as follows: 40-45:18-22:12-15: 0.2-0.5; the mass ratio of the dry alcohol mixture to the 1, 4-butanediol to the ethylene diamine ethyl sodium sulfonate to the carbon nano tube is as follows: 5:1: 6; the carbon nano tube is pretreated:
uniformly dispersing carbon nanotubes into an ethanol solution with the mass fraction of 5%, adding lanthanum maleate and diethylamide, stirring for reacting for 2 hours, then carrying out suction filtration, washing and drying to constant weight to obtain the nano-carbon nanotube material;
the mixing mass ratio of the carbon nano tube to the ethanol solution is 1: 5;
the mass ratio of the carbon nano tube to the lanthanum maleate to the diethylamide is 10: 3: 1; the drying and curing temperature in the thermostatic chamber is 88 ℃, and the curing time is 2 hours.
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