WO2007073030A1 - Environmentally friendly and low-energy consuming room-temperature composite degreaser - Google Patents

Environmentally friendly and low-energy consuming room-temperature composite degreaser Download PDF

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Publication number
WO2007073030A1
WO2007073030A1 PCT/KR2006/003565 KR2006003565W WO2007073030A1 WO 2007073030 A1 WO2007073030 A1 WO 2007073030A1 KR 2006003565 W KR2006003565 W KR 2006003565W WO 2007073030 A1 WO2007073030 A1 WO 2007073030A1
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Prior art keywords
amount
degreaser
environmentally friendly
friendly composite
sodium
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PCT/KR2006/003565
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French (fr)
Inventor
Byung Man Kim
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Best Maintaenance Service Co., Ltd.
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Publication of WO2007073030A1 publication Critical patent/WO2007073030A1/en

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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
    • C23G5/00—Cleaning or de-greasing metallic material by other methods; Apparatus for cleaning or de-greasing metallic material with organic solvents
    • C23G5/06—Cleaning or de-greasing metallic material by other methods; Apparatus for cleaning or de-greasing metallic material with organic solvents using emulsions
    • 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
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K2105/00—Erosion prevention

Definitions

  • the present invention relates to a composite degreaser which can degrease metal plates at room temperature, thus consuming a lesser amount of energy and being environmentally friendly.
  • a strip from a preceding hot rolling process is usually degreased, in most cases, with a sodium hydroxide solution or a sodium orthosilicate solution at 80°C in order to remove hot-rolling oil or impurities smeared thereon.
  • sodium hydroxide which is a strong alkali
  • sodium orthosilicate is usually used in batch annealing processes because the silicate film thus formed acts to prevent the steel plates from being detached from each other.
  • These alkaline solutions require heat for removing oily components from metal surfaces. Under heat, the alkaline solutions function to hydrolyze the oily components with the concomitant production of organic acids. Subsequently saponifying the organic acids, the alkali acts as a surfactant to remove oily components from the metal surface.
  • the conventional degreasers are effective at a temperature as high as 80°C, and thus consume a large quantity of energy.
  • a low-temperature degreaser capable of degreasing steel plates at 60°C has been developed (Korean Pat. Laid-Open Publication No. 2003-0054383). More recently, the temperature has been further decreased to 50°C.
  • the operational temperatures are still so high as to require a large quantity of energy.
  • conventional degreasers produce sufficient bubbles to disturb the worker in the degreasing process.
  • facilities and steel plates undergo oxidation under such high temperature and humidity conditions, resulting in dangerous working circumstances, environmental pollution, and an increase in the cost of treating waste water.
  • an object of the present invention is to provide a degreaser which can degrease metal plates at room temperature, thus overcomes conventional problems caused by high temperatures, that is, the problems of consuming a large quantity of energy, producing a lot of bubbles, degrading the working conditions, and oxidizing the facilities including the steel plates.
  • the present invention provides a room- temperature degreaser, capable of effectively degreasing metal plates at room temperature, comprising 5 ⁇ 25% of cellosolve or carbitol, 10 ⁇ 30% of an anionic or non-ionic surfactant, 2 ⁇ 3% of triethanolamine, 2 ⁇ 3% of EDTA-4Na, 1 ⁇ 2% of octanol, 1 ⁇ 3% of sodium molybdate, 1 ⁇ 3% of sodium metasilicate, and distilled water in the remaining amount to make 100%.
  • the room-temperature degreaser of the present invention is improved in saponification and emulsification activity compared to conventional degreasers.
  • the room-temperature degreaser of the present invention is diluted to a 1.0 ⁇ 5.0% solution, or is 20 ⁇ 100 fold diluted with distilled water before application for degreasing metal plates at about 25°C.
  • the degreaser according to the present invention can work effectively at room temperature(25°C), and overcomes conventional problems caused by high temperatures, that is, the problems of consuming a large quantity of energy, producing a lot of bubbles, degrading the working conditions, and oxidizing the facilities including the steel plates.
  • the degreaser of the present invention can be repeatedly used for a long period of time and still maintain high degreasing performance.
  • FlG. 1 is a view illustrating the fundamental principle of degreasing a metal plate with a degreaser according to the present invention.
  • FlG. 2 shows photographs after a non-degreased specimen (1), a specimen degreased with a conventional alkaline degreaser at room temperature (2), and a specimen degreased with the composite degreaser of the present invention at room temperature are immersed in colored water.
  • FlG. 3 shows photographs after 0.5 cc of colored water is dropped on a non- degreased specimen (1), a dry specimen degreased with a conventional alkaline degreaser at room temperature (2), and a dry specimen degreased with the composite degreaser of the present invention at room temperature (3), from a location 3 cm distant above from each specimen.
  • cellosolve such as ethyleneglycol monomethylether, ethyleneglycol monoethylether and ethyleneglycol monobutylether
  • carbitol such as diethyleneglycol monomethylether, diethyleneglycol monoethylether and diethyleneglycol monobutylether, and combinations thereof, is contained in an amount from 5 to 25%.
  • the room-temperature degreaser also comprises at least one surfactant, which may be anionic, like sodium dioctylsulfosuccinate, or nonionic, like polyethyleneglycol alkylphenylether, in an amount from 10 to 30%, triethanol amine in an amount from 2 to 3%, EDTA-4Na in an amount from 2 to 3%, octhyl alcohol in an amount from 1 to 2%, sodium molybdate in an amount from 1 to 3%, and sodium metasilicate in an amount from 1 to 3%, and distilled water in the remaining amount to make 100%.
  • the reason for limiting the amounts of the ingredients is as follows.
  • Cellosolve or carbitol acts to lower the surface tension of the degreaser solution, promote the dissolution of lipids, and aid the emulsification and dispersion activity of the surfactant.
  • the degreaser shows a low dissolving activity with regard to lipids.
  • more than 25% of cellosolve or carbitol disturbs the surfactant in the emulsification and dispersion function. Accordingly, a preferable amount of cellosolve or carbitol falls into the range of 5 to 25%.
  • the anionic or nonionic surfactant plays a role in promoting the osmotic, emulsifying and dispersing action of the degreasing solution by lowering the surface tension of the degreasing solution. That is, the anionic or nonionic surfactant functions to improve the saponification and emulsification activity of the degreasing solution, which can thus show excellent wettability on steel plates. If the content of the surfactant is less than 10%, problems are found in the surface tension and wettability. A content of the surfactant exceeding 30% causes the production of a large quantity of bubbles. Accordingly, the surfactant is preferably used in an amount from 10 to 30%.
  • Triethanolamine and the chelating agent EDTA-4Na are used to prevent the steel plate from undergoing oxidative discoloration in the degreasing process. If each of them is present in an amount less then 2%, the steel plate is discolored. If the amount exceeds 3%, the degreaser is decreased in wettability.
  • triethanolamine and the chelating agent EDTA-4Na are independently used in an amount from 2 to 3%.
  • Octyl alcohol serves as an anti-foaming agent in the degreasing process. If used in an amount less than 1%, the anti-foaming agent cannot suppress the generation of bubbles. Octyl alcohol, if used in an amount exceeding 2%, interrupts the emulsification activity of the degreaser. That is, a preferable amount of octyl alcohol is within the range from 1 to 2%.
  • sodium molybdate acts to confer anti-corrosion properties on steel plates, an amount thereof less than 1% does not ensure the anti-corrosion property for the steel. On the other hand, if used in an amount larger than 3%, the anti-corrosive agent degrades the wettability of the degreaser. Preferably, sodium molybdate is thus used in an amount from 1 to 3%.
  • Sodium metasilicate plays a role in increasing the electroconductivity and saponification of the degreaser. These activities cannot be obtained sufficiently when sodium metasilicate is used in an amount less than 1%. On the other hand, an amount exceeding 3% of sodium metasilicate excessively activates the saponification of the degreaser, thus producing too many bubbles. Thus, the amount of sodium metasilicate is preferably restricted to within 1 to 3%.
  • the degreaser according to the present invention can work effectively at room temperature(25°C), and overcomes conventional problems caused by high temperatures, that is, the problems of consuming a large quantity of energy, producing a lot of bubbles, degrading the working conditions, and oxidizing the facilities including the steel plates.
  • the degreaser of the present invention can be repeatedly used for a long period of time and still maintain high degreasing performance.

Abstract

Disclosed herein is an environmentally friendly and low-energy consuming composite degreaser capable of effectively degreasing metal plates at room temperature. It comprises 5~25 % of cellosolve or carbitol, 10~30 % of an anionic or non-ionic surfactant, 2~3 % of tri-ethanolamine, 2~3 % of EDTA-4Na, 1~2 % of octanol, 1~3 % of sodium molybdate, 1~3 % of sodium metasilicate, and distilled water in the remaining amount to make 100 %. The composite degreaser is diluted to 1-5 % solution or is diluted 20-100 fold with distilled water for use in practice, with an effective working temperature ranging from 20 to 30 °C.

Description

Description
ENVIRONMENTALLY FRIENDLY AND LOW-ENERGY CONSUMING ROOM-TEMPERATURE COMPOSITE
DEGREASER
Technical Field
[1] The present invention relates to a composite degreaser which can degrease metal plates at room temperature, thus consuming a lesser amount of energy and being environmentally friendly.
[2]
Background Art
[3] Before an annealing process, a strip from a preceding hot rolling process is usually degreased, in most cases, with a sodium hydroxide solution or a sodium orthosilicate solution at 80°C in order to remove hot-rolling oil or impurities smeared thereon.
[4] Particularly, when a continuous annealing process is conducted, sodium hydroxide, which is a strong alkali, is typically used for its adaptability and paintability. On the other hand, sodium orthosilicate is usually used in batch annealing processes because the silicate film thus formed acts to prevent the steel plates from being detached from each other. These alkaline solutions require heat for removing oily components from metal surfaces. Under heat, the alkaline solutions function to hydrolyze the oily components with the concomitant production of organic acids. Subsequently saponifying the organic acids, the alkali acts as a surfactant to remove oily components from the metal surface.
[5] Usually, the conventional degreasers are effective at a temperature as high as 80°C, and thus consume a large quantity of energy. Recently, a low-temperature degreaser capable of degreasing steel plates at 60°C has been developed (Korean Pat. Laid-Open Publication No. 2003-0054383). More recently, the temperature has been further decreased to 50°C. However, although decreased, the operational temperatures are still so high as to require a large quantity of energy. At such a high temperature, conventional degreasers produce sufficient bubbles to disturb the worker in the degreasing process. In addition, facilities and steel plates undergo oxidation under such high temperature and humidity conditions, resulting in dangerous working circumstances, environmental pollution, and an increase in the cost of treating waste water.
[6] With reference to FlG. 1, the fundamental principle of degreasing a metal plate with a degreaser is illustrated. As shown in FlG. 1, when the rolling oil smeared on a strip, which consists of mineral oil (CH3-CH2-CH2) and other carbon components and thus is lipophilic, is mixed with sodium hydroxide, emulsification occurs to change the lipophilic rolling oil to have a hydrophilic structure, which can be readily removed from the metal strip. In order to readily induce the chemical reaction, most conventional degreasers have to be maintained at high temperatures (e.g., 78~85°C ). Improper temperature maintenance significantly decreases the performance of conventional degreasers, leading to degradation of the product.
[7] Furthermore, when a worker directly handles conventional degreasers, he or she may be exposed to hazards such as a burning hazard. Particularly, the solution vaporizes at such a high temperature that it produces fumes, which contaminate the surroundings. Moreover, conventional degreasers produce a large quantity of bubbles, and thus an additional process is required to remove the bubbles.
[8]
Disclosure of Invention Technical Problem
[9] Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and an object of the present invention is to provide a degreaser which can degrease metal plates at room temperature, thus overcomes conventional problems caused by high temperatures, that is, the problems of consuming a large quantity of energy, producing a lot of bubbles, degrading the working conditions, and oxidizing the facilities including the steel plates.
[10] It is another object of the present invention to provide an environmentally friendly and low-energy consuming room-temperature composite degreaser which can be repeatedly used for a long period of time and still maintain high degreasing performance.
[H]
Technical Solution
[12] In order to achieve the above object, the present invention provides a room- temperature degreaser, capable of effectively degreasing metal plates at room temperature, comprising 5~25% of cellosolve or carbitol, 10~30% of an anionic or non-ionic surfactant, 2~3% of triethanolamine, 2~3% of EDTA-4Na, 1~2% of octanol, 1~3% of sodium molybdate, 1~3% of sodium metasilicate, and distilled water in the remaining amount to make 100%. The room-temperature degreaser of the present invention is improved in saponification and emulsification activity compared to conventional degreasers. In practice, the room-temperature degreaser of the present invention is diluted to a 1.0~5.0% solution, or is 20~100 fold diluted with distilled water before application for degreasing metal plates at about 25°C.
[13]
Advantageous Effects [14] As described hitherto, the degreaser according to the present invention can work effectively at room temperature(25°C), and overcomes conventional problems caused by high temperatures, that is, the problems of consuming a large quantity of energy, producing a lot of bubbles, degrading the working conditions, and oxidizing the facilities including the steel plates. In addition, the degreaser of the present invention can be repeatedly used for a long period of time and still maintain high degreasing performance.
[15]
Brief Description of the Drawings
[16] FlG. 1 is a view illustrating the fundamental principle of degreasing a metal plate with a degreaser according to the present invention.
[17] FlG. 2 shows photographs after a non-degreased specimen (1), a specimen degreased with a conventional alkaline degreaser at room temperature (2), and a specimen degreased with the composite degreaser of the present invention at room temperature are immersed in colored water.
[18] FlG. 3 shows photographs after 0.5 cc of colored water is dropped on a non- degreased specimen (1), a dry specimen degreased with a conventional alkaline degreaser at room temperature (2), and a dry specimen degreased with the composite degreaser of the present invention at room temperature (3), from a location 3 cm distant above from each specimen.
[19]
Best Mode for Carrying Out the Invention
[20] Below, a detailed description will be given of the room-temperature degreaser according to the present invention.
[21] In the room-temperature degreaser, one selected from the group consisting of cellosolve, such as ethyleneglycol monomethylether, ethyleneglycol monoethylether and ethyleneglycol monobutylether, carbitol, such as diethyleneglycol monomethylether, diethyleneglycol monoethylether and diethyleneglycol monobutylether, and combinations thereof, is contained in an amount from 5 to 25%. The room-temperature degreaser also comprises at least one surfactant, which may be anionic, like sodium dioctylsulfosuccinate, or nonionic, like polyethyleneglycol alkylphenylether, in an amount from 10 to 30%, triethanol amine in an amount from 2 to 3%, EDTA-4Na in an amount from 2 to 3%, octhyl alcohol in an amount from 1 to 2%, sodium molybdate in an amount from 1 to 3%, and sodium metasilicate in an amount from 1 to 3%, and distilled water in the remaining amount to make 100%. The reason for limiting the amounts of the ingredients is as follows.
[22] Cellosolve or carbitol acts to lower the surface tension of the degreaser solution, promote the dissolution of lipids, and aid the emulsification and dispersion activity of the surfactant. When cellosolve or carbitol is present in an amount less than 5%, the degreaser shows a low dissolving activity with regard to lipids. On the other hand, more than 25% of cellosolve or carbitol disturbs the surfactant in the emulsification and dispersion function. Accordingly, a preferable amount of cellosolve or carbitol falls into the range of 5 to 25%.
[23] The anionic or nonionic surfactant plays a role in promoting the osmotic, emulsifying and dispersing action of the degreasing solution by lowering the surface tension of the degreasing solution. That is, the anionic or nonionic surfactant functions to improve the saponification and emulsification activity of the degreasing solution, which can thus show excellent wettability on steel plates. If the content of the surfactant is less than 10%, problems are found in the surface tension and wettability. A content of the surfactant exceeding 30% causes the production of a large quantity of bubbles. Accordingly, the surfactant is preferably used in an amount from 10 to 30%.
[24] Triethanolamine and the chelating agent EDTA-4Na are used to prevent the steel plate from undergoing oxidative discoloration in the degreasing process. If each of them is present in an amount less then 2%, the steel plate is discolored. If the amount exceeds 3%, the degreaser is decreased in wettability. Preferably, triethanolamine and the chelating agent EDTA-4Na are independently used in an amount from 2 to 3%.
[25] Octyl alcohol serves as an anti-foaming agent in the degreasing process. If used in an amount less than 1%, the anti-foaming agent cannot suppress the generation of bubbles. Octyl alcohol, if used in an amount exceeding 2%, interrupts the emulsification activity of the degreaser. That is, a preferable amount of octyl alcohol is within the range from 1 to 2%.
[26] Because sodium molybdate acts to confer anti-corrosion properties on steel plates, an amount thereof less than 1% does not ensure the anti-corrosion property for the steel. On the other hand, if used in an amount larger than 3%, the anti-corrosive agent degrades the wettability of the degreaser. Preferably, sodium molybdate is thus used in an amount from 1 to 3%.
[27] Sodium metasilicate plays a role in increasing the electroconductivity and saponification of the degreaser. These activities cannot be obtained sufficiently when sodium metasilicate is used in an amount less than 1%. On the other hand, an amount exceeding 3% of sodium metasilicate excessively activates the saponification of the degreaser, thus producing too many bubbles. Thus, the amount of sodium metasilicate is preferably restricted to within 1 to 3%.
[28] A better understanding of the present invention may be realized with the following examples, which are set forth to illustrate, but are not to be construed to limit the present invention. [29]
Mode for the Invention
[30] Degreasers were prepared in the weight ratios set forth in Table 1, below. Also, the degreasers were tested for various physical properties and the results are given in Table 1.
[31] [32] Table 1
Figure imgf000006_0001
Figure imgf000007_0001
[33]
Industrial Applicability [34] As described hitherto, the degreaser according to the present invention can work effectively at room temperature(25°C), and overcomes conventional problems caused by high temperatures, that is, the problems of consuming a large quantity of energy, producing a lot of bubbles, degrading the working conditions, and oxidizing the facilities including the steel plates. In addition, the degreaser of the present invention can be repeatedly used for a long period of time and still maintain high degreasing performance.
[35]

Claims

Claims
[1] An environmentally friendly composite degreaser capable of showing effective degreasing performance at room temperature, comprising cellosolve or carbitol; an anionic or non-ionic surfactant; triethanolamine; EDTA-4Na; octyl alcohol; sodium molybdate; sodium metasilicate; and water.
[2] The environmentally friendly composite degreaser according to claim 1, wherein the degreaser comprises the cellosolve or carbitol in an amount from 5 to 25%, the anionic or non-ionic surfactant in an amount from 10 to 30%, the triethanolamine in an amount from 2 to 3%, the EDTA-4Na in an amount from 2 to 3%, the octyl alcohol in an amount from 1 to 2%, the sodium molybdate in an amount from 1 to 3%, the sodium metasilicate in an amount from 1 to 3%, and distilled water in a remaining amount to make 100%.
[3] The environmentally friendly composite degreaser according to claim 1, wherein the cellosolve is selected from a group consisting of ethyleneglycol monomethylether, ethyleneglycol monoethylether, ethyleneglycol monobutylether, and combinations thereof, and the carbitol is selected from a group consisting of diethyleneglycol monomethylether, diethyleneglycol monoethylether, diethyleneglycol monobutylether, and combinations thereof.
[4] The environmentally friendly composite degreaser according to claim 1, wherein the anionic surfactant is sodium dioctylsulfosuccinate and the non-ionic surfactant is polyethyleneglycol alkylphenylether, which are used together or individually.
[5] The environmentally friendly composite degreaser according to claim 1, wherein the octyl alcohol and the sodium molybdate are used as an anti-foaming agent and an anti-corrosive agent, respectively.
[6] The environmentally friendly composite degreaser according to claim 1, wherein the environmentally friendly composite degreaser is diluted to 1-5% solution or is diluted 20-100 fold with distilled water for use in practice, with an effective working temperature ranging from 20 to 30°C.
PCT/KR2006/003565 2005-12-21 2006-09-07 Environmentally friendly and low-energy consuming room-temperature composite degreaser WO2007073030A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2005-0126533 2005-12-21
KR1020050126533A KR100673906B1 (en) 2005-12-21 2005-12-21 The room-temperature compound degreaser for energy-saving & environment

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WO2007073030A1 true WO2007073030A1 (en) 2007-06-28

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Publication number Priority date Publication date Assignee Title
KR101425608B1 (en) 2011-02-28 2014-08-01 소원기 A normal temperature defat agent applicable in normal temperature and a defat method using the same
KR101070127B1 (en) 2011-07-28 2011-10-07 서성택 Alkali degrease additive usable at room temperature

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4395365A (en) * 1980-09-08 1983-07-26 Nissan Motor Co., Ltd. Metal cleaning composition containing a fatty acid succrose ester and other detergent components
JPH01149981A (en) * 1987-12-07 1989-06-13 Showa Shell Sekiyu Kk Water soluble degreasing composition
JPH06116768A (en) * 1992-10-02 1994-04-26 Nippon Parkerizing Co Ltd Phosphorusless alkaline degreasing liquid for low-temperature cleaning of metal
KR20050080963A (en) * 2004-02-11 2005-08-18 조규진 Highly efficient low temperature deoil formulation

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4395365A (en) * 1980-09-08 1983-07-26 Nissan Motor Co., Ltd. Metal cleaning composition containing a fatty acid succrose ester and other detergent components
JPH01149981A (en) * 1987-12-07 1989-06-13 Showa Shell Sekiyu Kk Water soluble degreasing composition
JPH06116768A (en) * 1992-10-02 1994-04-26 Nippon Parkerizing Co Ltd Phosphorusless alkaline degreasing liquid for low-temperature cleaning of metal
KR20050080963A (en) * 2004-02-11 2005-08-18 조규진 Highly efficient low temperature deoil formulation

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