CN115595592A - Degreasing agent and degreasing method for continuous strip steel - Google Patents
Degreasing agent and degreasing method for continuous strip steel Download PDFInfo
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- CN115595592A CN115595592A CN202110720073.8A CN202110720073A CN115595592A CN 115595592 A CN115595592 A CN 115595592A CN 202110720073 A CN202110720073 A CN 202110720073A CN 115595592 A CN115595592 A CN 115595592A
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- Prior art keywords
- degreasing
- agent
- strip steel
- steel
- sodium
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 152
- 239000010959 steel Substances 0.000 title claims abstract description 152
- 238000005238 degreasing Methods 0.000 title claims abstract description 82
- 238000005237 degreasing agent Methods 0.000 title claims abstract description 64
- 239000013527 degreasing agent Substances 0.000 title claims abstract description 63
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000004140 cleaning Methods 0.000 claims abstract description 34
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000003995 emulsifying agent Substances 0.000 claims abstract description 15
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 claims abstract description 12
- 229910019142 PO4 Inorganic materials 0.000 claims abstract description 12
- 239000010452 phosphate Substances 0.000 claims abstract description 12
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims abstract description 12
- 239000002518 antifoaming agent Substances 0.000 claims abstract description 11
- 239000002738 chelating agent Substances 0.000 claims abstract description 11
- 229910052751 metal Inorganic materials 0.000 claims abstract description 11
- 239000002184 metal Substances 0.000 claims abstract description 11
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 10
- 230000000149 penetrating effect Effects 0.000 claims abstract description 10
- 239000000203 mixture Substances 0.000 claims description 17
- -1 polyoxyethylene Polymers 0.000 claims description 16
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 15
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 13
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 12
- POAOYUHQDCAZBD-UHFFFAOYSA-N 2-butoxyethanol Chemical compound CCCCOCCO POAOYUHQDCAZBD-UHFFFAOYSA-N 0.000 claims description 9
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 9
- 238000001035 drying Methods 0.000 claims description 9
- 229920001451 polypropylene glycol Polymers 0.000 claims description 9
- 239000011734 sodium Substances 0.000 claims description 9
- 229910052708 sodium Inorganic materials 0.000 claims description 9
- 238000005507 spraying Methods 0.000 claims description 9
- 238000005868 electrolysis reaction Methods 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 8
- 238000005406 washing Methods 0.000 claims description 8
- 239000004721 Polyphenylene oxide Substances 0.000 claims description 7
- 229920000570 polyether Polymers 0.000 claims description 7
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 7
- 229920003171 Poly (ethylene oxide) Polymers 0.000 claims description 6
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 claims description 6
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 claims description 6
- 235000017550 sodium carbonate Nutrition 0.000 claims description 6
- AEQDJSLRWYMAQI-UHFFFAOYSA-N 2,3,9,10-tetramethoxy-6,8,13,13a-tetrahydro-5H-isoquinolino[2,1-b]isoquinoline Chemical compound C1CN2CC(C(=C(OC)C=C3)OC)=C3CC2C2=C1C=C(OC)C(OC)=C2 AEQDJSLRWYMAQI-UHFFFAOYSA-N 0.000 claims description 5
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims description 5
- 239000011737 fluorine Substances 0.000 claims description 5
- 229910052731 fluorine Inorganic materials 0.000 claims description 5
- 239000000176 sodium gluconate Substances 0.000 claims description 5
- 235000012207 sodium gluconate Nutrition 0.000 claims description 5
- 229940005574 sodium gluconate Drugs 0.000 claims description 5
- 235000019832 sodium triphosphate Nutrition 0.000 claims description 5
- 239000001488 sodium phosphate Substances 0.000 claims description 4
- 239000004094 surface-active agent Substances 0.000 claims description 4
- RYFMWSXOAZQYPI-UHFFFAOYSA-K trisodium phosphate Chemical compound [Na+].[Na+].[Na+].[O-]P([O-])([O-])=O RYFMWSXOAZQYPI-UHFFFAOYSA-K 0.000 claims description 4
- 235000019801 trisodium phosphate Nutrition 0.000 claims description 4
- 229910000406 trisodium phosphate Inorganic materials 0.000 claims description 4
- RZXLPPRPEOUENN-UHFFFAOYSA-N Chlorfenson Chemical compound C1=CC(Cl)=CC=C1OS(=O)(=O)C1=CC=C(Cl)C=C1 RZXLPPRPEOUENN-UHFFFAOYSA-N 0.000 claims description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 3
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 3
- GOOHAUXETOMSMM-UHFFFAOYSA-N Propylene oxide Chemical group CC1CO1 GOOHAUXETOMSMM-UHFFFAOYSA-N 0.000 claims description 3
- RTZKZFJDLAIYFH-UHFFFAOYSA-N ether Substances CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 3
- 239000011736 potassium bicarbonate Substances 0.000 claims description 3
- 235000015497 potassium bicarbonate Nutrition 0.000 claims description 3
- 229910000028 potassium bicarbonate Inorganic materials 0.000 claims description 3
- 229910000027 potassium carbonate Inorganic materials 0.000 claims description 3
- 235000011181 potassium carbonates Nutrition 0.000 claims description 3
- TYJJADVDDVDEDZ-UHFFFAOYSA-M potassium hydrogencarbonate Chemical compound [K+].OC([O-])=O TYJJADVDDVDEDZ-UHFFFAOYSA-M 0.000 claims description 3
- 229910000030 sodium bicarbonate Inorganic materials 0.000 claims description 3
- 235000017557 sodium bicarbonate Nutrition 0.000 claims description 3
- 229910052938 sodium sulfate Inorganic materials 0.000 claims description 3
- 235000011152 sodium sulphate Nutrition 0.000 claims description 3
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 claims description 3
- 238000013329 compounding Methods 0.000 claims description 2
- 239000002994 raw material Substances 0.000 claims description 2
- 239000003513 alkali Substances 0.000 abstract description 11
- 238000002310 reflectometry Methods 0.000 abstract description 9
- 239000002585 base Substances 0.000 abstract description 8
- 238000005265 energy consumption Methods 0.000 abstract description 7
- 239000003595 mist Substances 0.000 abstract description 5
- 239000000243 solution Substances 0.000 description 14
- 230000000694 effects Effects 0.000 description 9
- 239000000126 substance Substances 0.000 description 9
- 239000003921 oil Substances 0.000 description 7
- 235000019198 oils Nutrition 0.000 description 7
- 230000008569 process Effects 0.000 description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 239000010731 rolling oil Substances 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 4
- 239000003344 environmental pollutant Substances 0.000 description 4
- 239000004519 grease Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 231100000719 pollutant Toxicity 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- 238000007127 saponification reaction Methods 0.000 description 4
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 235000014113 dietary fatty acids Nutrition 0.000 description 3
- 239000000194 fatty acid Substances 0.000 description 3
- 229930195729 fatty acid Natural products 0.000 description 3
- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical compound [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 description 2
- 239000010775 animal oil Substances 0.000 description 2
- 230000001680 brushing effect Effects 0.000 description 2
- 238000007865 diluting Methods 0.000 description 2
- 238000004090 dissolution Methods 0.000 description 2
- 239000006260 foam Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000012466 permeate Substances 0.000 description 2
- 229920001983 poloxamer Polymers 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 235000015112 vegetable and seed oil Nutrition 0.000 description 2
- 239000008158 vegetable oil Substances 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical class [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 1
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910001424 calcium ion Inorganic materials 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000013530 defoamer Substances 0.000 description 1
- 238000003487 electrochemical reaction Methods 0.000 description 1
- 238000004945 emulsification Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000007602 hot air drying Methods 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 229910001425 magnesium ion Inorganic materials 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000002923 metal particle Substances 0.000 description 1
- 125000001160 methoxycarbonyl group Chemical group [H]C([H])([H])OC(*)=O 0.000 description 1
- 239000012074 organic phase Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000006179 pH buffering agent Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000002688 persistence Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000001509 sodium citrate Substances 0.000 description 1
- NLJMYIDDQXHKNR-UHFFFAOYSA-K sodium citrate Chemical compound O.O.[Na+].[Na+].[Na+].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O NLJMYIDDQXHKNR-UHFFFAOYSA-K 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 150000003460 sulfonic acids Chemical class 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000000844 transformation Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/14—Cleaning or pickling metallic material with solutions or molten salts with alkaline solutions
- C23G1/19—Iron or steel
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
- C25F1/00—Electrolytic cleaning, degreasing, pickling or descaling
- C25F1/02—Pickling; Descaling
- C25F1/04—Pickling; Descaling in solution
- C25F1/06—Iron or steel
Abstract
The invention discloses a degreasing agent and a degreasing method for continuous strip steel, which solve the technical problems of high energy consumption and alkali mist pollution of the conventional degreasing and cleaning of the continuous strip steel. The technical scheme is that the degreasing agent for the continuous strip steel is characterized by comprising the following components: 10-50g/L of strong base, 5-40g/L of carbonate, 1-40g/L of phosphate, 1-25g/L of metal chelating agent, 0.1-5.0g/L of emulsifier, 0.05-2.00g/L of penetrating agent, 0.001-0.200g/L of defoaming agent and the balance of pure water. The degreasing agent has stable and efficient degreasing capability within a wide temperature range of 40-80 ℃, can meet the requirements of degreasing and cleaning strip steel at different running speeds, particularly high-speed cleaning at the strip steel speed of more than 600m/min, greatly reduces alkali mist pollution because the reflectivity of the surface of the strip steel is more than or equal to 90 percent after degreasing, and realizes green and environment-friendly degreasing.
Description
Technical Field
The invention relates to a degreasing agent for strip steel, in particular to a degreasing agent and a degreasing method for continuous strip steel, and specifically relates to a wide-temperature-range efficient degreasing agent for continuous strip steel, belonging to the technical field of surface treatment.
Background
The steel plate needs rolling oil as a lubricant in the cold rolling process to realize the band steel with target thickness, the rolling oil on the surface of the band steel needs to be cleaned after the band steel is rolled, and the main component of the rolling oil is animal and vegetable oil, so the degreasing cleaning is called. A continuous strip steel high-speed unit is provided with a degreasing process, the temperature of a solution is generally 70-90 ℃, the energy consumption cost is high, meanwhile, alkali mist has adverse effects on workers and the environment, the degreasing is poor due to the direct reduction of the temperature of the solution, the speckle defect of a product is degraded, and if the degreasing efficiency is maintained, the consumption of auxiliary materials is increased. The low-temperature degreasing agent sold in the market at present mainly aims at the surface degreasing treatment of discontinuous parts, and indexes such as floating oil, cloud point, degreasing efficiency and the like of the low-temperature degreasing agent cannot meet the requirement of a continuous strip steel high-speed production line. The existing continuous strip steel low-temperature degreasing technology has no breakthrough achievement, and the main reason is that the degreasing technical requirement of a high-speed production line is not known, and the data support of the production line is lacked.
According to the field production experience for many years and the laboratory research, the surface cleaning of domestic and foreign continuous steel plate units is basically provided with a spraying and electrolytic cleaning mode, and the brushing mode is gradually accepted. The steel plate surface degreasing, except equipment, the most central is degreasing agent, and the degreasing solution temperature is high, and reaction rate is fast, is favorable to the degrease effect to promote, nevertheless sets out from the relation of heat energy consumption and degreasing solution temperature, and 70 ℃ and 50 ℃ degreasing solution temperature energy consumption differ about 1.5 times, and the reduction of degreasing solution temperature is showing the saving of cost. In addition, the existing degreasing agent contains alkali, and the temperature of the degreasing solution is high, so that the alkali fog is large, and the environment is polluted.
The application temperature of the existing degreasing agent is high, so that the degreasing cost of the strip steel is high, the environment is polluted, and the degreasing agent with low application temperature needs to be researched and developed.
Disclosure of Invention
The invention aims to provide a degreasing agent and a degreasing method for continuous strip steel, which solve the technical problems of high energy consumption and alkali mist pollution of the conventional degreasing and cleaning of the continuous strip steel; the degreasing agent is used for degreasing treatment of continuous strip steel, and has the capability of efficiently removing pollutants such as grease, iron powder and the like on the surface of the strip steel within a wide temperature range of 40-80 ℃.
The technical idea of the invention is that based on the characteristics of pollutants on the surface of a steel plate such as animal and vegetable oil, iron powder, oxide and the like, the chemical reaction difference in degreasing and cleaning is realized, and the high-efficiency surfactant is utilized to quickly permeate between the steel plate and an oil film through strong wettability in a wide temperature range, so that the oil film is accelerated to strip off the surface of the steel plate, and the processes of saponification, dissolution and the like are carried out in alkali liquor, thereby realizing the purpose of efficiently cleaning the high-speed strip steel.
The invention adopts the technical scheme that the degreasing agent for the continuous strip steel comprises the following components: 10-50g/L of strong base, 5-40g/L of carbonate, 1-40g/L of phosphate, 1-25g/L of metal chelating agent, 0.1-5.0g/L of emulsifier, 0.05-2.00g/L of penetrating agent, 0.001-0.200g/L of defoaming agent and the balance of pure water.
The strong base is one or a mixture of sodium hydroxide and potassium hydroxide; the carbonate is one or a mixture of more of sodium carbonate, potassium carbonate, sodium bicarbonate or potassium bicarbonate; the phosphate is one or a mixture of trisodium phosphate and sodium tripolyphosphate; the metal chelating agent is one or a mixture of two of sodium gluconate and citric acid; the emulsifier is one or a mixture of alkyl sodium sulfate, sodium alcohol sulfonate or sodium ether sulfonate, and the molecular weight of the emulsifier is 200-1300; the penetrating agent is one or a mixture of two of polyoxyethylene oxypropylene block polyether and fluorine-containing surfactant; the defoaming agent is one or a mixture of polypropylene glycol monobutyl ether or polyoxyethylene oxypropylene glyceryl ether.
In the invention, the strong base is one or two of sodium hydroxide and potassium hydroxide, and the substance can have strong saponification reaction with grease in rolling oil to generate high-solubility sodium fatty acid, and the problems of reduced cleaning efficiency, low saturated solubility of sodium fatty acid and the like are easily caused by over-low concentration of the sodium fatty acid; too high a concentration leads to an increase in the viscosity of the solution, an increase in consumption, a balancing of the cleaning effect and the solution consumption, the concentration of strong base being chosen to be between 10 and 50g/L.
In the invention, the carbonate is one or more of sodium carbonate, potassium carbonate, sodium bicarbonate or potassium bicarbonate; the phosphate is one or more of trisodium phosphate and sodium tripolyphosphate, and mainly has the functions of serving as a pH buffering agent, stabilizing the alkalinity of the degreasing agent solution and assisting in cleaning. When the concentration of the carbonate is 5-40g/L and the concentration of the phosphate is 1-40g/L, the iron powder on the surface can be effectively removed, and calcium and magnesium ions are complexed, so that the aim of softening water is fulfilled.
In the invention, the metal chelating agent is one or two of sodium gluconate and citric acid, and is mainly complexed with Fe 2+ The chemical oxidation of the steel plate is avoided, and the adsorption of metal particles on the degreased surface can be effectively reduced when the concentration is 1-25 g/L.
In the invention, the emulsifier is one or a mixture of more of alkyl sodium sulfate, sodium alcohol sulfonate or sodium ether sulfonate, the molecular weight of the emulsifier is 200-1300, and when the concentration is 0.1-5g/L, the emulsifier can effectively wet a steel plate, emulsify non-soluble substances in rolling oil, and disperse substances such as iron powder and the like.
In the invention, the penetrant is one or two of polyoxyethylene oxypropylene block polyether and fluorine-containing surface active test, and is 0.2 mass percent aqueous solution, the dynamic surface tension of the solution is 28-34mN/m and the cloud point is more than 80 ℃ at 40-80 ℃; when 0.05-2g/L of penetrating agent is added into the degreasing agent, the surface tension of the degreasing agent is low in a wide temperature range, the degreasing agent can quickly penetrate between a steel plate and an oil film, and the peeling of the oil film from the surface of the steel plate is accelerated.
In the invention, the defoaming agent is one or two of polypropylene glycol monobutyl ether and polyoxyethylene oxypropylene glyceryl ether, the concentration is 0.001-0.200g/L, the continuous defoaming capability of the defoaming agent is strong, the foam control of the solution under strong convection conditions can be met, and excessive concentration easily causes excessive organic phase precipitation to influence the degreasing effect.
In the invention, the polypropylene glycol monobutyl ether is obtained by compounding modified polyether and fluorine-containing raw materials, the weight content of the F element is 0.001-0.020%, and the polypropylene glycol monobutyl ether can have good dispersibility and persistence in an alkaline environment.
The preparation method of the degreasing agent comprises the following steps:
respectively weighing strong base, carbonate, phosphate, metal chelating agent, emulsifier, penetrant and defoamer according to the proportion, placing the mixture into a liquid preparation tank, slowly adding pure water, stirring until the mixture is completely dissolved, finally diluting to a set concentration, and transferring the mixture to a working tank for later use.
The method for degreasing the continuous strip steel by using the degreasing agent comprises the following steps:
1) Heating the degreasing agent to 40-80 ℃;
2) Degreasing the strip steel, degreasing the continuous strip steel by using a combined mode of spraying a degreasing agent and electrolyzing the strip steel, wherein the speed of the strip steel during degreasing is controlled to be 50-750m/min, and the degreasing time is controlled to be 5-90s; the current density of the electrolytic strip steel is 2-60A/dm 2 The electrolysis time is 1.5-30s;
3) Cleaning the band steel, cleaning the degreased band steel, washing the band steel by pure water at the temperature of 30-80 ℃, and then drying the band steel by hot air at the temperature of 80-120 ℃.
The surface reflectivity of the degreased strip steel is detected, the surface reflectivity of the degreased steel plate is larger than 90% and is obviously higher than the industrial cleaning requirement of 80%, and the best cleaning effect is achieved.
The reasons for the technological parameters adopted by the degreasing method of the invention are as follows:
1. the degreasing agent can efficiently degrease strip steel within the temperature range of 40-80 ℃, the degreasing efficiency of the surface of the strip steel is less influenced by temperature, and the penetrant in the degreasing agent has low surface tension within the temperature range, can powerfully permeate and accelerate the oil film to strip the surface of the steel plate, and is a technical basis for adjusting the degreasing agent within the wide temperature range, wherein the processes of saponification, dissolution and the like occur in alkali liquor.
2. The invention carries out degreasing treatment on the strip steel, realizes stripping and dissolving of an oil film on the surface of the steel plate through the contact of the strip steel and a degreasing agent and through the action of chemical, electrochemical and physical reactions, and is also suitable for a machine set containing a brushing mode.
3. The invention cleans the degreased strip steel, mainly removes chemical substances such as degreasing fluid on the surface of the steel plate, realizes surface cleaning, and realizes surface drying by hot air drying.
The method has the mechanism that the strip steel degreasing comprises the processes of chemical treatment and electrochemical treatment, and the chemical reaction mainly comprises the following saponification reaction: r 1 COOR 2 +MeOH→R 1 COOMe+R 2 OH, electrochemical reaction: 4OH - -4e→O 2 +2H 2 O (anodic), 2H 2 O+4e→H 2 +2OH - (cathode); in addition, physical processes such as emulsification, penetration and defoaming are also included.
Compared with the prior art, the invention has the following positive effects: 1. the degreasing agent is prepared by introducing a penetrating agent into an alkaline system, so that the low surface tension in a wide temperature range of 40-80 ℃ is realized, the grease on the surface of the strip steel can be penetrated and stripped, the effective removal of pollutants such as the grease on the surface of the strip steel, iron powder and the like is realized, and meanwhile, the degreasing agent meets the requirement of high-low temperature switching of the degreasing agent, has stable performance, can save energy consumption in the continuous processing process of the strip steel, and reduces energy consumption. 2. The degreasing agent is used for degreasing and cleaning continuous strip steel, can meet the requirements of degreasing and cleaning the strip steel at different running speeds, particularly high-speed cleaning at the strip steel speed of more than 600m/min, and can achieve the electrolytic limiting current density of 40-60A/dm 2 Meanwhile, under the condition of strong convection, the solution keeps good foam performance, and after degreasing, the reflectivity of the surface of the band steel is more than or equal to 90 percent and is obviously higher than the industrial degreasing requirement that the reflectivity of the surface of the band steel is 80 percent. 3. The degreasing agent does not contain substances which cannot be degraded biologically and chemicals which are not friendly to the environment, has simple sewage treatment and meets the requirement of environmental protection; meanwhile, the degreasing agent has a good degreasing effect at the working condition temperature of 40-60 ℃, so that the alkali mist pollution is greatly reduced, and the green environment-friendly degreasing is realized.
Detailed Description
The present invention will be further illustrated below with reference to specific embodiments, which are to be understood as merely illustrative and not limitative of the scope of the present invention.
Embodiment 1, a degreasing agent for continuous strip steel, comprising the following components: strong alkali, sodium hydroxide 20g/L; carbonate, sodium carbonate 15g/L; phosphate, sodium tripolyphosphate 12g/L; metal chelating agent, sodium gluconate 5g/L; emulsifier, sodium dodecyl sulfate 2g/L; penetrating agent, pluronic PE 10300 block polyether 0.6g/L; defoaming agent: 0.1g/L of polypropylene glycol monobutyl ether and the balance of pure water.
The preparation method of the degreasing agent comprises the following steps:
respectively weighing strong base, carbonate, phosphate, metal chelating agent, emulsifier, penetrant and defoaming agent according to a ratio, placing the materials into a liquid preparation tank, slowly adding pure water, stirring until the materials are completely dissolved, finally diluting to a set concentration, and transferring the materials to a working tank for later use.
The method for degreasing the continuous strip steel by using the degreasing agent comprises the following steps:
1) Heating the degreasing agent to 50 ℃;
2) Degreasing the strip steel, degreasing the continuous strip steel by using a combined mode of spraying a degreasing agent and electrolyzing the strip steel, and controlling the speed of the strip steel to be 450m/min and the degreasing time to be 8.0s; the current density of the electrolytic strip steel is 15A/dm 2 The electrolysis time is 2.67s;
3) Cleaning the steel strip, cleaning the degreased steel strip, washing the steel strip by pure water at the temperature of 50 ℃, and then drying the steel strip by hot air at the temperature of 80 ℃.
In example 1, the surface reflectance of the cleaned steel sheet was measured, and the results are shown in table 1.
Embodiment 2, the method for degreasing the continuous strip steel by using the degreasing agent of embodiment 1 includes the following steps:
1) Heating the degreasing agent to 70 ℃;
2) Degreasing the strip steel, degreasing the continuous strip steel by using a combined mode of spraying a degreasing agent and electrolyzing the strip steel, wherein the strip steel speed during degreasing is controlled to be 450m/min, and the degreasing time is 8.0s; the current density of the electrolytic strip steel is 15A/dm 2 The electrolysis time is 2.67s;
3) Cleaning the band steel, cleaning the degreased band steel, washing the band steel by pure water at the temperature of 50 ℃, and then drying the band steel by hot air at the temperature of 80 ℃.
In example 2, the surface reflectance of the cleaned steel sheet was measured, and the results are shown in table 1.
Embodiment 3, a degreasing agent for continuous strip steel, comprising the following components: strong alkali, 25g/L of sodium hydroxide, carbonate and 10g/L of sodium carbonate; phosphate, trisodium phosphate 25g/L; metal chelating agent, sodium gluconate 5g/L; emulsifier, sodium dodecyl sulfate 2g/L; penetrating agent, pluronic PE 10300 block polyether 0.6g/L; defoaming agent: 0.1g/L of polypropylene glycol monobutyl ether and the balance of pure water.
The method for degreasing the continuous strip steel by using the degreasing agent comprises the following steps:
1) Heating the degreasing agent to 50 ℃;
2) Degreasing the strip steel, degreasing the continuous strip steel by using a combined mode of spraying a degreasing agent and electrolyzing the strip steel, and controlling the speed of the strip steel to be 600m/min and the degreasing time to be 6.0s; the current density of the electrolytic strip steel is 30A/dm 2 The electrolysis time is 2.0s;
3) Cleaning the steel strip, cleaning the degreased steel strip, washing the steel strip by pure water at the temperature of 50 ℃, and then drying the steel strip by hot air at the temperature of 100 ℃.
In example 3, the surface reflectance of the cleaned steel sheet was measured, and the results are shown in table 1.
Embodiment 4, the method for degreasing the continuous strip steel by using the degreasing agent of embodiment 3 comprises the following steps:
1) Heating the degreasing agent to 70 ℃;
2) Degreasing the strip steel, degreasing the continuous strip steel by using a combined mode of spraying a degreasing agent and electrolyzing the strip steel, and controlling the speed of the strip steel to be 600m/min and the degreasing time to be 6.0s; the current density of the electrolytic strip steel is 30A/dm 2 The electrolysis time is 2.0s;
3) Cleaning the band steel, cleaning the degreased band steel, washing the band steel by pure water at the temperature of 50 ℃, and then drying the band steel by hot air at the temperature of 100 ℃.
In example 4, the surface reflectance of the cleaned steel sheet was measured, and the results are shown in table 1.
Embodiment 5, a degreasing agent for continuous strip steel, comprising the following components: strong base, potassium hydroxide 15g/L, carbonate, sodium carbonate 15g/L; phosphate, sodium tripolyphosphate 10g/L; a metal chelating agent, 5g/L sodium citrate; emulsifier, NS-665 fatty alcohol sulfonate 1.5g/L; penetrating agent, perfluorinated sulfonic acid surfactant NF-46,0.08g/L; defoaming agent: 0.1g/L of polypropylene glycol monobutyl ether, and the balance of pure water.
The method for degreasing the continuous strip steel by using the degreasing agent comprises the following steps:
1) Heating the degreasing agent to 40 ℃;
2) Degreasing the strip steel, degreasing the continuous strip steel by using a combined mode of spraying a degreasing agent and electrolyzing the strip steel, wherein the strip steel speed during degreasing is controlled to be 650m/min, and the degreasing time is 5.4s; the current density of the electrolytic strip steel is 40A/dm 2 The electrolysis time is 1.85s;
3) Cleaning the steel strip, cleaning the degreased steel strip, washing the steel strip by pure water at the temperature of 50 ℃, and then drying the steel strip by hot air at the temperature of 105 ℃.
In example 5, the surface reflectance of the cleaned steel sheet was measured, and the results are shown in table 1.
Embodiment 6, the method for degreasing the continuous strip steel by using the degreasing agent of embodiment 5 comprises the following steps:
1) Heating the degreasing agent to 70 ℃;
2) Degreasing the strip steel, degreasing the continuous strip steel by using a combined mode of spraying a degreasing agent and electrolyzing the strip steel, and controlling the speed of the strip steel to be 650m/min and the degreasing time to be 5.4s; the current density of the electrolytic strip steel is 40A/dm 2 The electrolysis time is 1.85s;
3) Cleaning the band steel, cleaning the degreased band steel, washing the band steel by pure water at the temperature of 50 ℃, and then drying the band steel by hot air at the temperature of 105 ℃.
In example 6, the surface reflectance of the cleaned steel sheet was measured, and the results are shown in table 1.
Table 1 strip steel degreasing process control parameters and surface reflectivity of degreased strip steel according to embodiments of the present invention
The degreasing effect of the strip steel is positively correlated with the reflectivity of the surface of the strip steel, the higher the reflectivity of the surface of the strip steel is, the better the degreasing effect is, as shown in table 1, the degreasing agents of the embodiments 1 to 6 can clean pollutants on the surface of the strip steel at high and low temperatures, the reflectivity of the surface of the strip steel after degreasing is more than or equal to 90%, and the degreasing effect is good.
The foregoing is only a preferred embodiment of the present invention, and other embodiments of the present invention are possible in addition to the above-described embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.
Claims (5)
1. The degreasing agent for the continuous strip steel is characterized by comprising the following components: 10-50g/L of strong base, 5-40g/L of carbonate, 1-40g/L of phosphate, 1-25g/L of metal chelating agent, 0.1-5.0g/L of emulsifier, 0.05-2.00g/L of penetrating agent, 0.001-0.200g/L of defoaming agent and the balance of pure water; the penetrating agent is one or a mixture of two of polyoxyethylene oxypropylene block polyether and fluorine-containing surfactant; the defoaming agent is one or a mixture of polypropylene glycol monobutyl ether or polyoxyethylene oxypropylene glyceryl ether.
2. The degreasing agent for continuous strip steel as claimed in claim 1, wherein the polypropylene glycol monobutyl ether is obtained by compounding modified polyether and fluorine-containing raw materials, and the weight content of the F element is 0.001% -0.020%.
3. The degreasing agent for continuous strip steel as claimed in claim 1, wherein the strong base is one or a mixture of two of sodium hydroxide and potassium hydroxide; the carbonate is one or a mixture of sodium carbonate, potassium carbonate, sodium bicarbonate or potassium bicarbonate; the phosphate is one or a mixture of trisodium phosphate and sodium tripolyphosphate; the metal chelating agent is one or a mixture of two of sodium gluconate and citric acid; the emulsifier is one or more of alkyl sodium sulfate, sodium alcohol sulfonate or sodium ether sulfonate, and the molecular weight of the emulsifier is 200-1300.
4. A method of degreasing a continuous steel strip using the degreasing agent of claim 1, comprising the steps of:
1) Heating the degreasing agent to 40-80 ℃;
2) Degreasing the strip steel, degreasing the continuous strip steel by using a combined mode of spraying a degreasing agent and electrolyzing the strip steel, controlling the speed of the strip steel to be 50-750m/min during degreasing, and controlling the degreasing time to be 5-90s; the current density of the electrolytic strip steel is 2-60A/dm 2 The electrolysis time is 1.5-30s;
3) Cleaning the band steel, cleaning the degreased band steel, washing the band steel by pure water at the temperature of 30-80 ℃, and then drying the band steel by hot air at the temperature of 80-120 ℃.
5. The method of claim 4, wherein the surface reflectance of the strip after degreasing is not less than 90%.
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