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CN114574867B - Rust remover and preparation method and application thereof - Google Patents

Rust remover and preparation method and application thereof Download PDF

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Publication number
CN114574867B
CN114574867B CN202210164723.XA CN202210164723A CN114574867B CN 114574867 B CN114574867 B CN 114574867B CN 202210164723 A CN202210164723 A CN 202210164723A CN 114574867 B CN114574867 B CN 114574867B
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parts
rust remover
rust
acid
stirring
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CN114574867A (en
Inventor
薛峰
陈敏
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Suzhou Industrial Park Kerida New Material Technology Co ltd
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Suzhou Industrial Park Kerida New Material Technology Co ltd
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    • 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
    • C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
    • C23G1/08—Iron or steel
    • C23G1/088—Iron or steel solutions containing organic acids
    • 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
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
    • C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
    • C23C22/40—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing molybdates, tungstates or vanadates
    • 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
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
    • C23C22/68—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous solutions with pH between 6 and 8
    • 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
    • C23G1/24—Cleaning or pickling metallic material with solutions or molten salts with neutral solutions

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  • Chemical & Material Sciences (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Detergent Compositions (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)

Abstract

The invention discloses a rust remover and a preparation method and application thereof. The rust remover comprises the following components in parts by weight: 100-300 parts of organic acid and/or organic acid salt, 5-20 parts of phosphoric acid, 3-10 parts of chelating agent, 0.5-2 parts of acid preparation agent, 1-3 parts of molybdate, 2-5 parts of surfactant, 80-200 parts of cosolvent and the balance of water. The rust remover disclosed by the invention has the advantages that strong acid and fluoride salt are not present, so that the security of the rust remover is enhanced, and the low-toxicity environment-friendly high-efficiency perfluoroalkyl acetate is introduced for the first time, has ultrahigh surface activity and certain lubricity, so that the rust remover prepared by the invention has the advantages of quick rust removal time, obvious rust removal effect and good rust prevention effect.

Description

Rust remover and preparation method and application thereof
Technical Field
The invention belongs to the technical field of rust removal, and particularly relates to a rust remover, and a preparation method and application thereof.
Background
Rust has been a major problem that plagues human production and life, and in industrial production and social development processes, the metal that is most in contact with is an iron base material, and metallic iron is one of the most easily rusted metals. In the life of today, a great deal of metal corrodes and rusts every year to cause the waste of resources and energy, thereby forming huge economic loss.
The rust removal of the metal rust remover is the most direct and convenient means, the research on the rust remover is already available, the commercially available rust remover is also a five-flower eight-door, the real effect is obvious and rapid, the number is small, the rust remover is especially used in chemical production, the simplest rust remover is used for removing the rust screw on the flange, and the rust remover with good and rapid effect is especially needed. If the rust remover is common and has poor effect, the security accident is likely to be brought, so the development of the rust remover with rapid and obvious rust removal and obvious rust prevention effect is a problem to be solved urgently.
Disclosure of Invention
The invention mainly aims to provide a rust remover as well as a preparation method and application thereof, so as to overcome the defects of the prior art.
In order to achieve the purpose of the invention, the technical scheme adopted by the invention comprises the following steps:
the embodiment of the invention provides a rust remover, which comprises the following components in parts by weight: 100-300 parts of organic acid and/or organic acid salt, 5-20 parts of phosphoric acid, 3-10 parts of chelating agent, 0.5-2 parts of acid preparation agent, 1-3 parts of molybdate, 2-5 parts of surfactant, 80-200 parts of cosolvent and the balance of water.
In some more specific embodiments, the rust remover comprises the following components in parts by weight: 200-280 parts of mixture of citric acid and sodium salicylate, 10-20 parts of phosphoric acid, 3-10 parts of sodium polyacrylate and/or ammonium polyacrylate, 0.5-2 parts of potassium bromide and/or potassium iodide, 1-3 parts of sodium molybdate and/or ammonium molybdate, 2-5 parts of perfluoroalkyl C6 straight-chain methyl ester and/or perfluoroalkyl C6 branched-chain methyl ester, and 80-200 parts of polyvinylpyrrolidone, wherein the rest part comprises water. Mixing organic acid and/or organic acid salt, phosphoric acid, an acid preparation agent and molybdate with water, stirring for 0.5-4 h at room temperature or after proper temperature rise, and then sequentially adding a chelating agent, a cosolvent and a surfactant, mixing and stirring uniformly to obtain the rust remover.
The embodiment of the invention also provides a preparation method of the rust remover, which comprises the following steps: mixing organic acid and/or organic acid salt, phosphoric acid, an acid preparation agent and molybdate with water, stirring at room temperature for 0.5-4 h, sequentially adding a chelating agent, a cosolvent and a surfactant, and uniformly mixing and stirring to obtain the rust remover.
The embodiment of the invention also provides application of the rust remover in the metal rust removal or prevention field.
Compared with the prior art, the invention has the beneficial effects that: the rust remover disclosed by the invention has the advantages that strong acid and fluoride salt are not present, the condition of the rust removing liquid is mild, the pH is neutral or weak acid, the safety of the rust remover is enhanced, a durable ultrathin anti-corrosion coating can be formed, and the low-toxicity environment-friendly high-efficiency perfluoroalkyl acetate is introduced for the first time, the surface activity is ultrahigh, and meanwhile, the rust remover has certain lubricity, so that the rust remover prepared by the invention has the advantages of quick rust removing time, obvious rust removing effect, obvious rust preventing effect and wide industrial application range.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present invention, and other drawings may be obtained according to the drawings without inventive effort to those skilled in the art.
FIG. 1 is a graph showing the comparative rust removing time of the rust remover of examples 1 to 8 and comparative examples 1 to 8 according to the present invention;
FIG. 2 is a graph showing pH values of rust inhibitors in examples 1 to 8 and comparative examples 1 to 8 according to the present invention.
Detailed Description
In view of the shortcomings of the prior art, the inventor of the present application has long studied and put forward a great deal of practice, and the technical solution of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The rust remover provided by one aspect of the embodiment of the invention is characterized by comprising the following components in parts by weight: 100-300 parts of organic acid and/or organic acid salt, 5-20 parts of phosphoric acid, 3-10 parts of chelating agent, 0.5-2 parts of acid preparation agent, 1-3 parts of molybdate, 2-5 parts of surfactant, 80-200 parts of cosolvent and the balance of water.
Further, the total part of the rust remover is 1000 parts.
In some more specific embodiments, the organic acid and/or organic acid salt includes any one or a combination of two or more of citric acid, sodium citrate, and sodium salicylate, and is not limited thereto.
Further, the organic acid and/or organic acid salt comprises a mixture of citric acid and sodium salicylate, wherein the mass ratio of the citric acid to the sodium salicylate is 1.0-1.6:1.
In some more specific embodiments, the chelating agent includes any one or a combination of two or more of sodium polyacrylate, ammonium polyacrylate, sodium polymethacrylate, and ammonium polymethacrylate, and is not limited thereto.
Further, the chelating agent includes ammonium polyacrylate, and is not limited thereto.
In some more specific embodiments, the acid generator includes any one or a combination of two or more of sodium bromide, potassium bromide, sodium iodide, and potassium iodide, and is not limited thereto.
Further, the acid generator includes potassium bromide and/or potassium iodide, and is not limited thereto.
In some more specific embodiments, the molybdate includes sodium molybdate and/or ammonium molybdate, and is not limited thereto.
Further, the molybdate includes ammonium molybdate, and is not limited thereto.
In some more specific embodiments, the surfactant includes, but is not limited to, perfluoroalkyl acetate.
Further, the total number of carbon atoms of the perfluoroalkyl group in the perfluoroalkyl acetate is from C4 to C9, and is not limited thereto.
Further, the perfluoroalkyl acetate includes linear or branched fluoroalkyl acetate, and is not limited thereto.
Further, the perfluoroalkyl acetate includes any one or a combination of two or more of perfluorobutyl acetate, perfluoroamyl acetate, perfluorohexyl acetate, perfluoroheptyl acetate, perfluorooctyl acetate, and perfluorononyl acetate, and is not limited thereto.
Still further, the perfluoroalkyl acetate includes branched or straight-chain perfluorohexyl methyl acetate, and is not limited thereto.
Still further, the perfluoroalkyl acetate includes a perfluoroalkyl C6 branched methyl ester, and is not limited thereto.
In some more specific embodiments, the co-solvent includes pyrrolidone, and is not limited thereto.
Further, the pyrrolidone includes N-methyl pyrrolidone and/or polyvinylpyrrolidone, and is not limited thereto.
Still further, the pyrrolidone includes polyvinylpyrrolidone, and is not limited thereto.
In some more specific embodiments, the rust remover comprises the following components in parts by weight: 200-280 parts of a mixture of citric acid and sodium salicylate, 10-20 parts of phosphoric acid, 3-10 parts of sodium polyacrylate and/or ammonium polyacrylate, 0.5-2 parts of potassium bromide and/or potassium iodide, 1-3 parts of sodium molybdate and/or ammonium molybdate, 2-5 parts of perfluoroalkyl C6 straight-chain methyl ester and/or perfluoroalkyl C6 branched-chain methyl ester, 80-200 parts of polyvinylpyrrolidone and the balance of water.
In some more specific embodiments, the rust remover comprises the following components in parts by weight: 255 parts of a mixture of citric acid and sodium salicylate, 15 parts of phosphoric acid, 4 parts of ammonium polyacrylate, 1 part of potassium bromide and/or potassium iodide, 1.5 parts of ammonium molybdate, 4 parts of perfluoroalkyl C6 branched methyl ester, 120 parts of polyvinylpyrrolidone, and the balance of water.
Another aspect of the embodiment of the present invention further provides a method for preparing the foregoing rust remover, which includes: mixing organic acid and/or organic acid salt, phosphoric acid, an acid preparation agent and molybdate with water, stirring for 0.5-4 h at room temperature or after proper temperature rise, and then sequentially adding a chelating agent, a cosolvent and a surfactant, mixing and stirring uniformly to obtain the rust remover.
In some more specific embodiments, the method of preparing the rust remover comprises: firstly, adding organic acid and salts thereof, an acid preparation agent, molybdate and phosphoric acid into pure water at room temperature, stirring for 0.5-2 h, adding a chelating agent after full dissolution, stirring for 0.5-1h, adding a cosolvent, stirring for 0.5-1h, finally adding a surfactant, and rapidly stirring for 1-2 h to obtain the rust remover.
Another aspect of the embodiments of the present invention also provides the use of the foregoing rust remover in the field of metal rust removal or prevention.
The technical scheme of the invention is further described in detail below with reference to a plurality of preferred embodiments, the embodiments are implemented on the premise of the technical scheme of the invention, and detailed implementation modes and specific operation processes are given, but the protection scope of the invention is not limited to the following embodiments.
The experimental materials used in the examples described below, unless otherwise specified, were all commercially available from conventional biochemicals.
Example 1
The rust remover in the embodiment comprises the following components in parts by weight: 200 parts of citric acid, 10 parts of phosphoric acid, 3 parts of sodium polyacrylate, 0.8 part of potassium bromide, 1.5 parts of sodium molybdate, 4.5 parts of perfluorobutyl methyl acetate, 100 parts of polyvinylpyrrolidone and the balance of deionized water, wherein the total weight is 1000 parts; the preparation method of the rust remover comprises the following steps:
(1) Adding deionized water into a reactor according to parts by weight, starting stirring, controlling the rotating speed to be not too high, controlling the rotating speed to be 50-80rpm, sequentially adding citric acid, phosphoric acid, potassium bromide and sodium molybdate, and heating to 50 ℃ to ensure that the solid is completely dissolved;
(2) Cooling to 40deg.C, adjusting the rotation speed to 100rpm, adding sodium polyacrylate, stirring for 40min, adding polyvinylpyrrolidone, and stirring ih;
(3) And (3) rotating the speed to 120rpm, dropwise adding the perfluorobutyl methyl acetate into the reactor, ending dropwise adding within 1.5h, stirring for 1h, and standing and discharging to obtain the rust remover.
Example 2
The rust remover in the embodiment comprises the following components in parts by weight: 150 parts of citric acid, 130 parts of sodium citrate, 10 parts of phosphoric acid, 3 parts of ammonium polyacrylate, 1 part of potassium bromide, 1.5 parts of sodium molybdate, 3.5 parts of perfluorohexyl methyl acetate, 100 parts of N-methylpyrrolidone and the balance of deionized water, wherein the total weight is 1000 parts; the preparation method of the rust remover comprises the following steps:
(1) Adding deionized water into a reactor according to parts by weight, starting stirring, controlling the rotating speed to be not too high, controlling the rotating speed to be 50-80rpm, sequentially adding citric acid, sodium citrate, phosphoric acid, potassium bromide and sodium molybdate, and heating to 50 ℃ to ensure that the solid is completely dissolved;
(2) Cooling to 40deg.C, adjusting the rotation speed to 100rpm, adding ammonium polyacrylate, stirring for 40min, adding N-methylpyrrolidone, and stirring for 1 hr;
(3) And (3) rotating the speed to 120rpm, dropwise adding perfluorohexyl methyl acetate into the reactor, ending dropwise adding within 1.5h, stirring for 1h, and standing and discharging to obtain the rust remover.
Example 3
The rust remover in the embodiment comprises the following components in parts by weight: 150 parts of citric acid, 130 parts of sodium citrate, 13 parts of phosphoric acid, 4 parts of ammonium polyacrylate, 1 part of potassium bromide, 1.5 parts of sodium molybdate, 3.5 parts of methyl perfluorohexyl acetate, 100 parts of polyvinylpyrrolidone and the balance of deionized water, wherein the total weight is 1000 parts; the preparation method of the rust remover comprises the following steps:
(1) Adding deionized water into a reactor according to parts by weight, starting stirring, controlling the rotating speed to be not too high, controlling the rotating speed to be 50-80rpm, sequentially adding citric acid, sodium citrate, phosphoric acid, potassium bromide and sodium molybdate, and heating to 50 ℃ to ensure that the solid is completely dissolved;
(2) Cooling to 40deg.C, adjusting the rotation speed to 100rpm, adding ammonium polyacrylate, stirring for 40min, adding polyvinylpyrrolidone, and stirring for 1 hr;
(3) And (3) rotating the speed to 120rpm, dropwise adding perfluorohexyl methyl acetate into the reactor, ending dropwise adding within 1.5h, stirring for 1h, and standing and discharging to obtain the rust remover.
Example 4
The rust remover in the embodiment comprises the following components in parts by weight: 145 parts of citric acid, 110 parts of sodium salicylate, 15 parts of phosphoric acid, 4 parts of ammonium polyacrylate, 1 part of potassium bromide, 1.5 parts of ammonium molybdate, 4 parts of methyl perfluorohexyl acetate, 120 parts of polyvinylpyrrolidone and the balance of deionized water, wherein the total weight is 1000 parts; the preparation method of the rust remover comprises the following steps:
(1) Adding deionized water into a reactor according to parts by weight, starting stirring, controlling the rotating speed to be not too high, controlling the rotating speed to be 50-80rpm, sequentially adding citric acid, sodium salicylate, phosphoric acid, potassium bromide and ammonium molybdate, and heating to 50 ℃ to ensure that the solid is completely dissolved;
(2) Cooling to 40deg.C, adjusting the rotation speed to 100rpm, adding ammonium polyacrylate, stirring for 40min, adding polyvinylpyrrolidone, and stirring for 1 hr;
(3) And (3) rotating the speed to 120rpm, dropwise adding perfluorohexyl methyl acetate into the reactor, ending dropwise adding within 1.5h, stirring for 1h, and standing and discharging to obtain the rust remover.
Example 5
The rust remover in the embodiment comprises the following components in parts by weight: 160 parts of citric acid, 100 parts of sodium salicylate, 15 parts of phosphoric acid, 4 parts of ammonium polyacrylate, 0.9 part of potassium bromide, 1.2 parts of sodium molybdate, 3.2 parts of methyl perfluorooctyl acetate, 160 parts of polyvinylpyrrolidone and the balance of deionized water, wherein the total weight is 1000 parts; the preparation method of the rust remover comprises the following steps:
(1) Adding deionized water into a reactor according to parts by weight, starting stirring, controlling the rotating speed to be not too high, controlling the rotating speed to be 50-80rpm, sequentially adding citric acid, sodium salicylate, phosphoric acid, potassium bromide and sodium molybdate, and heating to 50 ℃ to ensure that the solid is completely dissolved;
(2) Cooling to 40deg.C, adjusting the rotation speed to 100rpm, adding ammonium polyacrylate, stirring for 40min, adding polyvinylpyrrolidone, and stirring ih;
(3) And (3) rotating the speed to 120rpm, dropwise adding perfluorooctyl methyl acetate into the reactor, ending dropwise adding within 1.5h, stirring for 1h, and standing and discharging to obtain the rust remover.
Example 6
The rust remover in the embodiment comprises the following components in parts by weight: 50 parts of citric acid, 50 parts of sodium salicylate, 5 parts of phosphoric acid, 3 parts of sodium polymethacrylate, 0.5 part of potassium iodide, 1 part of ammonium molybdate, 2 parts of methyl perfluoro-amyl acetate, 80 parts of polyvinylpyrrolidone and the balance of deionized water, wherein the total weight is 1000 parts; the preparation method of the rust remover comprises the following steps:
(1) Adding deionized water into a reactor according to parts by weight, starting stirring, controlling the rotating speed to be not too high, controlling the rotating speed to be 50-80rpm, sequentially adding citric acid, sodium salicylate, phosphoric acid, potassium iodide and ammonium molybdate, and heating to 50 ℃ to ensure that the solid is completely dissolved;
(2) Cooling to 40deg.C, adjusting the rotation speed to 100rpm, adding sodium polymethacrylate, stirring for 40min, adding polyvinylpyrrolidone, and stirring for 1 hr;
(3) And (3) rotating the speed to 120rpm, dropwise adding methyl perfluoro-amyl acetate into the reactor, ending dropwise adding within 1.5h, stirring for 1h, and standing and discharging to obtain the rust remover.
Example 7
The rust remover in the embodiment comprises the following components in parts by weight: 150 parts of citric acid, 150 parts of sodium salicylate, 20 parts of phosphoric acid, 10 parts of ammonium polymethacrylate, 2 parts of sodium bromide, 3 parts of ammonium molybdate, 5 parts of ethyl perfluoroheptyl acetate, 200 parts of polyvinylpyrrolidone and the balance of deionized water, wherein the total weight is 1000 parts; the preparation method of the rust remover comprises the following steps:
(1) Adding deionized water into a reactor according to parts by weight, starting stirring, controlling the rotating speed to be not too high, controlling the rotating speed to be 50-80rpm, sequentially adding citric acid, sodium salicylate, phosphoric acid, sodium bromide and ammonium molybdate, and heating to 50 ℃ to ensure that the solid is completely dissolved;
(2) Cooling to 40deg.C, adjusting the rotation speed to 100rpm, adding ammonium polymethacrylate, stirring for 40min, adding polyvinylpyrrolidone, and stirring for 1 hr;
(3) And (3) rotating the speed to 120rpm, dropwise adding Quan Fugeng ethyl acetate into the reactor, ending the dropwise adding within 1.5h, stirring for 1h, standing and discharging to obtain the rust remover.
Example 8
The rust remover in the embodiment comprises the following components in parts by weight: 150 parts of citric acid, 150 parts of sodium salicylate, 20 parts of phosphoric acid, 10 parts of ammonium polymethacrylate, 2 parts of sodium bromide, 3 parts of ammonium molybdate, 5 parts of perfluorononylacetic acid ethyl ester, 200 parts of polyvinylpyrrolidone and the balance of deionized water, wherein the total weight is 1000 parts; the preparation method of the rust remover comprises the following steps:
(1) Adding deionized water into a reactor according to parts by weight, starting stirring, controlling the rotating speed to be not too high, controlling the rotating speed to be 50-80rpm, sequentially adding citric acid, sodium salicylate, phosphoric acid, sodium bromide and ammonium molybdate, and heating to 50 ℃ to ensure that the solid is completely dissolved;
(2) Cooling to 40deg.C, adjusting the rotation speed to 100rpm, adding ammonium polymethacrylate, stirring for 40min, adding polyvinylpyrrolidone, and stirring for 1 hr;
(3) And (3) rotating the speed to 120rpm, dropwise adding Quan Fugeng ethyl acetate into the reactor, ending the dropwise adding within 1.5h, stirring for 1h, standing and discharging to obtain the rust remover.
Comparative example 1
The rust remover in the embodiment comprises the following components in parts by weight: 255 parts of citric acid, 15 parts of phosphoric acid, 4 parts of ammonium polyacrylate, 1 part of potassium bromide, 1.5 parts of ammonium molybdate, 4 parts of perfluorohexyl methyl acetate, 120 parts of polyvinylpyrrolidone and the balance of deionized water, wherein the total weight is 1000 parts; the preparation method is the same as in example 4.
Comparative example 2
The rust remover in the embodiment comprises the following components in parts by weight: 15 parts of phosphoric acid, 4 parts of ammonium polyacrylate, 1 part of potassium bromide, 1.5 parts of ammonium molybdate, 4 parts of perfluorohexyl methyl acetate, 120 parts of polyvinylpyrrolidone and the balance of deionized water, wherein the total weight is 1000 parts; the preparation method is the same as in example 4.
Comparative example 3
The rust remover in the embodiment comprises the following components in parts by weight: 145 parts of citric acid, 110 parts of sodium salicylate, 15 parts of phosphoric acid, 4 parts of ammonium polyacrylate, 1 part of potassium bromide, 1.5 parts of ammonium molybdate, 120 parts of polyvinylpyrrolidone and the balance of deionized water, wherein the total weight is 1000 parts; the preparation method is the same as in example 4.
Comparative example 4
The rust remover in the embodiment comprises the following components in parts by weight: 145 parts of citric acid, 110 parts of sodium salicylate, 15 parts of phosphoric acid, 4 parts of ammonium polyacrylate, 1 part of potassium bromide, 1.5 parts of ammonium molybdate, 4 parts of perfluorohexyl methyl acetate and the balance deionized water, wherein the total weight is 1000 parts; the preparation method is the same as in example 4.
Comparative example 5
The rust remover in the embodiment comprises the following components in parts by weight: 145 parts of citric acid, 110 parts of sodium salicylate, 4 parts of ammonium polyacrylate, 1 part of potassium bromide, 1.5 parts of ammonium molybdate, 4 parts of methyl perfluorohexyl acetate, 120 parts of polyvinylpyrrolidone and the balance of deionized water, wherein the total weight is 1000 parts; the preparation method is the same as in example 4.
Comparative example 6
The rust remover in the embodiment comprises the following components in parts by weight: 145 parts of citric acid, 110 parts of sodium salicylate, 15 parts of phosphoric acid, 1 part of potassium bromide, 1.5 parts of ammonium molybdate, 4 parts of perfluorohexyl methyl acetate, 120 parts of polyvinylpyrrolidone and the balance of deionized water, wherein the total weight is 1000 parts; the preparation method is the same as in example 4.
Comparative example 7
The rust remover in the embodiment comprises the following components in parts by weight: 145 parts of citric acid, 110 parts of sodium salicylate, 15 parts of phosphoric acid, 4 parts of ammonium polyacrylate, 1.5 parts of ammonium molybdate, 4 parts of perfluorohexyl methyl acetate, 120 parts of polyvinylpyrrolidone and the balance of deionized water, wherein the total weight is 1000 parts; the preparation method is the same as in example 4.
Comparative example 8
The rust remover in the embodiment comprises the following components in parts by weight: 145 parts of citric acid, 110 parts of sodium salicylate, 15 parts of phosphoric acid, 4 parts of ammonium polyacrylate, 1 part of potassium bromide, 4 parts of perfluorohexyl methyl acetate, 120 parts of polyvinylpyrrolidone and the balance of deionized water, wherein the total weight is 1000 parts; the preparation method is the same as in example 4.
Performance tests were performed on the rust inhibitors of examples 1-5 and comparative examples 1-8 according to the following procedure:
(1) A carbon steel bolt and nut of M20 is purchased from the market and is all screwed on a steel flange of DN200 and is screwed down under the same condition; (2) Soaking the flange of the bolt screwed in the step (1) in 5% sodium chloride solution for 12h, taking out, and horizontally placing under the eave for 30 days (with the nut upwards); (3) The rust removers in examples 1 to 5 and comparative examples 1 to 8 were sprayed onto 1.5ml of 1-13# bolt and nut, and further sprayed with 1.5ml of 5% diluted hydrochloric acid onto 14# bolt and nut, and two commercially available rust removers a and B were selected and sprayed onto 1.5ml of 15# and 16# bolt and nut, respectively, and rust peeling time on each bolt, loosening after 2 minutes, influence of the surface of the bolt after light purging, and presence or absence of rust after 7 days were observed, and the test results are shown in table 1:
TABLE 1 test results of rust inhibitors in examples 1 to 5 and comparative examples 1 to 8 and existing rust inhibitors
* : example 8 and comparative example 4 were not completely dissolved and a precipitate was formed.
Characterization of the properties: the comparative graphs of the rust removal times in examples 1 to 8 and comparative examples 1 to 8 are shown in FIG. 1; the pH values of the rust inhibitors in examples 1 to 8 and comparative examples 1 to 8 are shown in FIG. 2. In fig. 1 to 2, examples 1 to 8 correspond to the rust inhibitors of examples 1 to 8, respectively, and pairs 1 to 8 correspond to the rust inhibitors of comparative examples 1 to 8, respectively.
As can be seen from Table 1 and FIGS. 1-2, the rust remover prepared by the invention has obvious effect, high rust removing speed, mild condition and better rust preventing effect, and from the aspects of action effect and environmental protection, the C6 linear or branched chain perfluoroalkyl methyl acetate or ethyl ester is more suitable, meanwhile, the rust removing mechanism is inferred from the test and the result, hydrogen ions generated by the system react with rust to produce metal ions, at the moment, chelating agent and metal ions form chelate, organic fluorine surfactant has stronger hydrophobicity, chelate dissolved in water is replaced out of the metal surface, so that the organic fluorine surfactant is adhered to the metal surface, meanwhile, the organic fluorine surfactant has a certain lubricity, the friction force of the metal surface can be effectively reduced, the phenomenon that nuts in the embodiment are easy to loosen is not difficult to be explained, in addition, the organic fluorine surfactant has ultralow surface tension, molybdate and film forming factors in a synergistic system can form a coating on the metal surface, the rust preventing capability is enhanced, and the organic fluorine surfactant can be decomposed with organic acid in the organic fluorine surfactant in the system for a long time after being adhered to the metal surface, the corrosion preventing capability can be prolonged, and the like can be decomposed with organic acid in the organic acid system. Therefore, the use of the organic fluorine surfactant in the rust remover is a large prominent bright point and has more advantages.
In addition, the inventors have conducted experiments with other materials, process operations, and process conditions as described in this specification with reference to the foregoing examples, and have all obtained desirable results.
It should be understood that the technical solution of the present invention is not limited to the above specific embodiments, and all technical modifications made according to the technical solution of the present invention without departing from the spirit of the present invention and the scope of the claims are within the scope of the present invention.

Claims (3)

1. The rust remover is characterized by comprising the following components in parts by weight: 200-280 parts of a mixture of citric acid and sodium salicylate, 10-20 parts of phosphoric acid, 3-10 parts of sodium polyacrylate and/or ammonium polyacrylate, 0.5-2 parts of potassium bromide and/or potassium iodide, 1-3 parts of ammonium molybdate, 2-5 parts of branched or straight-chain perfluorohexyl methyl acetate, 80-200 parts of polyvinylpyrrolidone and the balance of water; the total parts of the rust remover are 1000 parts;
wherein the mass ratio of the citric acid to the sodium salicylate is 1.0-1.6:1.
2. The method for preparing the rust remover as set forth in claim 1, comprising: and mixing the mixture of citric acid and sodium salicylate, phosphoric acid, potassium bromide and/or potassium iodide and ammonium molybdate with water, stirring at room temperature for 0.5-4 h, sequentially adding sodium polyacrylate and/or ammonium polyacrylate, polyvinylpyrrolidone and branched or straight-chain perfluoro hexyl methyl acetate, and uniformly mixing and stirring to obtain the rust remover.
3. Use of the rust remover according to claim 1 in the field of metal rust removal or prevention.
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