Room-temperature degreasing agent applicable at room temperature and room-temperature degreasing solution comprising same

Abstract

The present invention relates to a room-temperature degreasing agent that is applicable at room temperature, and a room-temperature degreasing solution comprising same. More specifically, the present invention relates to a novel room-temperature degreasing agent comprising a specific gemini pendant-type cationic surfactant, and to a room-temperature degreasing solution comprising same, which enable implementation of stable degreasing performance in which whiteness of 90 or more is exhibited at room temperature (20-50 ℃) even without mutual circulation between a deposition degreasing tank and an electrolytic degreasing tank. In addition to the functions and effects of an anionic surfactant and a solubilizer contained in conventional room-temperature degreasing agents, the strong cleaning power and excellent dispersion effect of the gemini pendant-type cationic surfactant that is newly added to the room-temperature degreasing agent applicable at room temperature, according to the present invention, act synergistically such that degreasing power increases rapidly, thus enabling stable removal of organic matter and rolling oil on the surface of a strip even under temperature conditions of 30 ℃ or higher.

Description

A room temperature degreasing agent applicable at room temperature and a room temperature degreasing solution containing the same

[0001] The present invention relates to a room temperature degreasing agent applicable at room temperature and a room temperature degreasing solution containing the same. More specifically, the invention relates to a novel room temperature degreasing agent containing a specific Gemini pendant-type cationic surfactant and a room temperature degreasing solution containing the same, so as to achieve stable degreasing performance exhibiting a whiteness of 90 or higher without mutual circulation between an immersion degreasing tank and an electrolytic degreasing tank at room temperature (20℃ to 50℃).

[0002] The pretreatment process for materials such as steel or aluminum consists of steps including a pickling process using strong acids to remove oxides or impurities attached to the inner surface, a degreasing process to remove organic contaminants (e.g., oil) remaining on the metal surface, and a rust prevention process to form a protective film or apply an antioxidant to prevent rust formation on the metal surface. In particular, if contaminants such as oxides, hydroxides, metal salts, and oils attached to the metal surface are not completely removed during the degreasing process, defects such as poor adhesion of the plating layer, poor gloss, and corrosion may occur, which becomes a factor in degrading product quality.

[0003] Degreasing agents currently widely used in degreasing processes are based on saponification, and thus exhibit the best degreasing performance at high temperatures of 80°C or higher, which is the optimal temperature for this process. However, there is a disadvantage in that degreasing performance rapidly deteriorates as the temperature drops. Meanwhile, Korean Patent Publication No. 10-2003-0054383 demonstrates the difference in degreasing rates by temperature through experiments, and Korean Patent Publication No. 10-2006-0072352 and Korean Patent Publication No. 10-2003-0054383 explain in detail the surfactants and other additives to enable degreasing, which was previously performed at high temperatures, to be carried out at low temperatures. However, since this technology also requires a working temperature of 55°C to 65°C, separate heating equipment is required, which increases energy consumption and acts as a factor that makes the working environment inefficient.

[0004] Accordingly, Korean Published Patent No. 10-2012-0098536 describes a method in which heat generated from the electrode (grid) during the electrolysis process in the electrolytic degreasing tank is circulated to the immersion degreasing tank to facilitate heat exchange, thereby maintaining the electrolytic degreasing tank at an average temperature of 45–50°C and the immersion degreasing tank at an average temperature of 30–35°C, enabling degreasing at room temperature without the need for separate heating equipment. However, there was a problem in that the degreasing liquid in the immersion degreasing tank, which is heavily contaminated with degreasing agent, and the degreasing liquid in the electrolytic degreasing tank, which is relatively less contaminated, circulate and mix with each other, rapidly contaminating the degreasing liquid in the electrolytic degreasing tank, which needs to be kept clean, thereby shortening the usage (replacement) period of the degreasing liquid.

[0005] [Prior Art Literature]

[0006] [Patent Literature]

[0007] Patent Document 1: Korean Published Patent Application No. 10-2012-0098536 (Published Sep. 05, 2012)

[0008] The present invention is intended to solve the aforementioned problems,

[0009] Compared to conventional degreasing solution technology that can be used at room temperature (20℃~50℃) but has a shortened service (replacement) period due to contamination caused by mutual circulation between the immersion degreasing tank and the electrolytic degreasing tank, a new room temperature degreasing agent containing a specific Gemini pendant-type cationic surfactant and a room temperature degreasing solution containing the same are provided so as to achieve stable degreasing performance exhibiting a whiteness of 90 or higher at room temperature without mutual circulation between the immersion degreasing tank and the electrolytic degreasing tank.

[0010] The problems solved by the present invention are not limited to those mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the description below.

[0011] In order to solve the aforementioned problems,

[0012] The present invention comprises 5 to 60 parts by weight of an alkali agent alone or in two or more types, 10 to 30 parts by weight of an anionic surfactant alone or in two or more types, 10 to 30 parts by weight of a solubilizing agent alone or in two or more types, 1 to 5 parts by weight of a chelating agent alone or in two or more types, 1 to 5 parts by weight of an antifoaming agent, and 1 to 20 parts by weight of a Gemini pendant-type cationic surfactant, wherein the Gemini pendant-type cationic surfactant is represented by the following chemical formula 1, and is a room temperature degreasing agent applicable at room temperature:

[0013] [Chemical Formula 1]

[0014]

[0015] In the above chemical formula 1, R1 and R4 are the same or different and are each independently an alkyl or alkenyl having 5 to 30 carbon atoms, R2, R3, R5 and R6 are the same or different and are each independently an alkyl having 1 to 5 carbon atoms, the alkyl may be substituted or unsubstituted, m and n are each independently integers from 1 to 10, X is a halogen element, and S provides a linker.

[0016] In addition, the present invention provides a room temperature degreasing agent applicable at room temperature, wherein the alkali agent comprises one or more selected from the group consisting of sodium hydroxide, sodium carbonate, sodium orthosilicate, sodium metasilicate, sodium phosphate, and potassium hydroxide.

[0017] In addition, the present invention provides a room temperature degreasing agent applicable at room temperature, wherein the anionic surfactant comprises one or more selected from the group consisting of dioctyl sulfosuccinate sodium salt, sodium fatty acid, alkyl polyoxyethylene sulfate, alkylbenzene sulfonate, and monoalkyl phosphate.

[0018] In addition, the present invention provides a room temperature degreasing agent applicable at room temperature, wherein the solubilizing agent comprises one or more selected from the group consisting of lauryl glucoside, ethanol, monoethylene glycol, diethylene glycol, propylene glycol, and hexylene glycol.

[0019] In addition, the present invention provides a room temperature degreasing agent applicable at room temperature, wherein the chelating agent comprises one or more selected from the group consisting of EDTA (ethylene diaminetetraacetic acid), EDTA-2Na (disodium ethylenediaminetetraacetate), EDTA-4Na (tetrasodium ethylenediaminetetraacetate), HEDTA (hydroxyeter ethylenediamine triacetic acid), NTA (nitrilotriacetic acid), DTPA (diethylentriamine pentaacetic acid), and oxalic acid.

[0020] In addition, the present invention provides a room temperature degreasing agent applicable at room temperature, wherein the defoaming agent comprises one or more selected from silicone-based defoaming agents or non-silicone-based defoaming agents.

[0021] In addition, the present invention provides a room temperature degreasing solution applicable at room temperature, comprising a room temperature degreasing agent applicable at room temperature.

[0022] In addition, the present invention provides a room temperature degreasing solution applicable at room temperature, comprising a room temperature degreasing agent applicable at room temperature in an amount of 1 to 50 weight percent.

[0023] The room temperature degreasing agent applicable at room temperature according to the embodiments of the present invention is a new room temperature degreasing agent applicable at room temperature that enables stable degreasing performance exhibiting a whiteness of 90 or more without mutual circulation between the immersion degreasing tank and the electrolytic degreasing tank, thereby enabling significant energy savings as well as an extension of the degreasing solution replacement period.

[0024] In addition to the action and effects of anionic surfactants and solubilizers contained in existing room temperature degreasing agents, the powerful cleaning power and excellent dispersion effect of the Gemini pendant-type cationic surfactant newly added to the room temperature degreasing agent applicable at room temperature according to the present invention are added, and through mutual synergy, the degreasing power is rapidly increased, making it possible to stably remove organic matter and rolling oil from the strip surface even under temperature conditions of 30°C or higher.

[0025] Due to this synergistic effect on degreasing performance, the potential for problems such as insufficient saponification reaction, reduced degreasing power, and floating of rolling oil and organic matter in the upper layer caused by emulsification instability—issues pointed out as problems when the temperature of conventional room-temperature degreasing agents drops—is fundamentally eliminated. This enables stable and excellent degreasing performance without circulating the degreasing solution in the immersion degreasing tank and the electrolytic degreasing tank.

[0026] As a result, it helps to completely resolve the problems associated with conventional room-temperature degreasing agents, such as the premature contamination of the degreasing solution in the electrolytic degreasing tank and the resulting rapid decline in degreasing performance caused by circulating the degreasing solution between the sedimentation and electrolytic degreasing tanks, as well as the economic losses and increased wastewater treatment volume resulting from the reduced degreasing solution replacement cycle.

[0027] The effects of the present invention are not limited to those mentioned above, and other unmentioned effects will be clearly understood by those skilled in the art from the description below.

[0028] The attached drawings are intended to explain the contents of the present invention in more detail to those skilled in the art, and the technical concept of the present invention is not limited thereto.

[0029] FIG. 1 is a schematic diagram showing the configuration of a degreasing process to which a room temperature degreasing agent applicable at room temperature according to one embodiment of the present invention is applied.

[0030] Figure 2 is a diagram schematically showing the equipment configuration of an electrolytic degreasing tank and the principle of electrolytic degreasing.

[0031] Figure 3 is a diagram illustrating a method for measuring the degreasing performance of a room temperature degreasing agent applicable at room temperature.

[0032] Hereinafter, a room temperature degreasing agent applicable at room temperature and a room temperature degreasing solution containing the same according to the present invention will be described in detail; however, the range of the room temperature degreasing agent applicable at room temperature and the room temperature degreasing solution containing the same is not limited by the following description.

[0033] Throughout the specification, when a part is described as "including" a certain component, this means that, unless specifically stated otherwise, it does not exclude other components but may include additional components.

[0034]

[0035] In this specification, "room temperature degreasing agent applicable at room temperature (hereinafter, room temperature degreasing agent)" means a degreasing agent applicable to a degreasing process of a metal (e.g., a steel plate with rolling oil on its surface) at 20°C to 50°C (i.e., capable of achieving a degreasing rate of 95 parts by weight or more and a whiteness of 90 or more).

[0036] In addition, in this specification, "room temperature degreasing solution applicable at room temperature (hereinafter, room temperature degreasing solution)" refers to a solution prepared by diluting a room temperature degreasing agent applicable at room temperature with water, which is applicable to a degreasing process of a metal (e.g., a steel plate with rolling oil on its surface) at 20 to 50°C (i.e., capable of achieving a degreasing rate of 95% or more and a whiteness of 90 or more).

[0037] Furthermore, in this specification, "Whiteness" refers to a visual or optical numerical representation of how effectively contaminants (e.g., oils, oxides, etc.) have been removed from a metal surface, and signifies an important indicator for evaluating the cleanliness of the metal surface. The higher the whiteness, the better the contaminants have been removed from the metal surface.

[0038]

[0039] A room temperature degreasing agent applicable at room temperature according to one embodiment of the present invention may comprise 5 to 60 parts by weight of an alkali agent alone or in two or more types, 10 to 30 parts by weight of an anionic surfactant alone or in two or more types, 10 to 30 parts by weight of a solubilizing agent alone or in two or more types, 1 to 5 parts by weight of a chelating agent alone or in two or more types, 1 to 5 parts by weight of an antifoaming agent, and 1 to 20 parts by weight of a Gemini pendant-type cationic surfactant.

[0040] If the above-mentioned room temperature degreasing agent applicable at room temperature contains the above-mentioned alkali agent, the above-mentioned anionic surfactant, the above-mentioned solubilizing agent, the above-mentioned chelating agent, the above-mentioned defoaming agent, and the above-mentioned Gemini pendant-type cationic surfactant in their respective content ranges, the degreasing agent can achieve stable degreasing performance exhibiting a whiteness of 90 or higher without mutual circulation between the immersion degreasing tank and the electrolytic degreasing tank, thereby enabling significant energy savings as well as an extension of the degreasing solution replacement period.

[0041] The above alkaline agent plays a role in enhancing the degreasing power of a room-temperature degreasing agent applicable at room temperature that contains it. More specifically, it can contribute to chemically decomposing and dissolving contaminants on the metal surface by participating in saponification reactions, emulsification, and pH adjustment.

[0042] The above alkali agent may include one or more selected from the group consisting of sodium hydroxide, sodium carbonate, sodium orthosilicate, sodium metasilicate, sodium phosphate, and potassium hydroxide.

[0043] The above-mentioned anionic surfactant, like the above-mentioned alkali agent, plays a role in improving the degreasing power of the degreasing agent containing it. More specifically, it can contribute to improving degreasing power by participating in emulsification, improvement of cleaning power, reduction of surface tension, and dispersion effects.

[0044] The above anionic surfactant may include one or more selected from the group consisting of sodium dioctyl sulfosuccinate, sodium fatty acid, alkyl polyoxyethylene sulfate, alkylbenzene sulfonate, and monoalkyl phosphate.

[0045] The above-mentioned solubilizing agent plays a role in helping oil, such as rolling oil originating from the surface of the steel plate to be degreased, to dissolve in the above-mentioned degreasing agent.

[0046] The above solubilizing agent may include one or more selected from the group consisting of lauryl glucoside, ethanol, monoethylene glycol, diethylene glycol, propylene glycol, and hexylene glycol.

[0047] The above chelating agent performs the role of preventing the degreasing agent containing it from hardening. Hardening refers to a phenomenon in which the cleaning power and the effectiveness of surfactants are reduced due to calcium and magnesium ions in water. By chemically bonding with metal ions to form a stable complex, the above chelating agent can effectively prevent problems caused by hardening (such as precipitation formation and reduced surfactant performance).

[0048] The above chelating agent may include one or more selected from the group consisting of EDTA (ethylene diaminetetraacetic acid), EDTA-2Na (disodium ethylenediaminetetraacetate), EDTA-4Na (tetrasodium ethylenediaminetetraacetate), HEDTA (hydroxyeter ethylenediamine triacetic acid), NTA (nitrilotriacetic acid), DTPA (diethylentriamine pentaacetic acid), and oxalic acid.

[0049] The above-mentioned defoaming agent serves to prevent foam from forming in the above-mentioned degreasing agent containing it.

[0050] The above defoaming agent may include one or more selected from silicone-based defoaming agents or non-silicone-based defoaming agents.

[0051] The above silicone-based defoamer may include one or more selected from silicone copolyol-based defoamers or defoamers containing silica in polydimethylsiloxane.

[0052] The above-mentioned non-silicone antifoaming agent may include one or more selected from the group consisting of propylene oxide adducts of alcohols, higher fatty acids, higher fatty acid salts, and fatty acid esters.

[0053] The above-mentioned Gemini pendant-type cationic surfactant performs the role of improving the degreasing power of the degreasing agent containing it, just like the above-mentioned alkali agent and the above-mentioned anionic surfactant.

[0054] The above Gemini pendant-type cationic surfactant can be represented by the following chemical formula 1.

[0055] [Chemical Formula 1]

[0056]

[0057] In the above chemical formula 1, R1 and R4 are the same or different and are each independently an alkyl or alkenyl having 5 to 30 carbon atoms, R2, R3, R5 and R6 are the same or different and are each independently an alkyl having 1 to 5 carbon atoms, the alkyl may be substituted or unsubstituted, m and n are each independently integers from 1 to 10, X is a halogen element, and S is a linker.

[0058]

[0059] Hereinafter, a room temperature degreasing solution applicable at room temperature according to one embodiment of the present invention will be described in detail.

[0060] The degreasing solution according to one embodiment of the present invention includes a room temperature degreasing agent applicable at room temperature.

[0061] The above degreasing solution may contain a room temperature degreasing agent applicable at room temperature in an amount of 1 to 50 weight percent. Specifically, the above degreasing solution may contain 1 to 50 weight percent of the above degreasing agent and 50 to 99 weight percent of water.

[0062] If the content of the degreasing agent in the above degreasing solution is less than 1% by weight, a decrease in degreasing power occurs in the immersion degreasing section and the electrolytic degreasing section, and if it exceeds 50% by weight, foaming problems occur, making it difficult to use. Additionally, when using a high concentration, the proportion of the degreasing solution in the production cost of the strip increases, making it difficult to use.

[0063]

[0064] FIG. 1 is a schematic diagram showing the equipment configuration of a degreasing process (100) to which a room temperature degreasing agent applicable at room temperature according to one embodiment of the present invention is applied, and FIG. 2 is a schematic diagram showing the equipment configuration of an electrolytic degreasing tank and the principle of electrolytic degreasing.

[0065] Referring to FIG. 1, a degreasing process (100) to which a room temperature degreasing agent applicable at room temperature according to one embodiment of the present invention is applied includes an immersion degreasing tank (110), a room temperature degreasing liquid brush roll (BR1), an electrolytic degreasing tank (120), a hot water brush roll (BR2), and a hot water spray tank (130).

[0066] The degreasing process (100) may be a process for cleaning the surface of a steel plate during the manufacturing process of a steel company that produces cold-rolled steel plates, which are materials for automobiles, home appliances, and exterior building materials, as well as plated steel plates and painted (color) steel plates produced by applying various plating and painting treatments to the surface of the cold-rolled steel plates.

[0067] Generally, cold rolling mills perform degreasing or cleaning operations as a pretreatment prior to annealing to clean the surface of steel plates and remove oils and foreign substances, such as rolling oil, that have adhered to the surface during the rolling process or the preceding process. Furthermore, plating mills and color steel plate mills that apply various plating and painting to the surface of steel plates perform degreasing or cleaning operations as a pretreatment prior to plating and painting to remove rust-preventive oil applied to the surface of the steel plates.

[0068] The installation section of the immersion degreasing tank (110), the room temperature degreasing liquid brush roll (BR1), and the electrolytic degreasing tank (120) can be collectively referred to as the room temperature degreasing agent application section, and the installation section of the hot water brush roll (BR2) and the hot water spray tank (130) can be collectively referred to as the hot water application section.

[0069] The immersion degreasing tank (110) is a device that removes contaminants through a saponification reaction between oil components attached to the surface of the steel plate and an alkali agent, which is a major component of the room temperature degreasing agent. The higher the temperature, the better the saponification reaction occurs, and the degreasing power is improved.

[0070] As shown in FIG. 2, the electrolytic degreasing tank (120) is configured such that electrodes (grids) are installed in a tank containing a room temperature degreasing agent containing an alkali agent and a strip (steel plate) passes between the electrodes, and contaminants can be rapidly removed due to the severe stirring of the gas generated at the cathode (H2) or anode (O2) by the electrolysis of the room temperature degreasing agent and the gas generated between the strip and the contaminants.

[0071]

[0072] The present invention will be described in more detail below with reference to examples, but the present invention is not limited to these examples.

[0073]

[0074] Example 1: Preparation of a room temperature degreasing agent

[0075] A room temperature degreasing agent was prepared by mixing 60 parts by weight of sodium hydroxide as an alkali agent, 30 parts by weight of sodium dioctyl sulfosuccinate (DOSS) as an anionic surfactant, 30 parts by weight of lauryl glucoside (LGS) as a solubilizing agent, 5 parts by weight of EDTA-4Na as a chelating agent, 5 parts by weight of a non-silicone defoaming agent (Saehan Silicon Lucky AB) as an antifoaming agent, and 20 parts by weight of a Gemini Pendant Cationic Surfactant (GPCS) represented by the above chemical formula 1.

[0076] Example 2: Preparation of a room temperature degreasing agent

[0077] A room temperature degreasing agent was prepared in the same manner as in Example 1, except that sodium dioctyl sulfosuccinate (DOSS) was used as an anionic surfactant in an amount of 10 parts by weight.

[0078] Example 3: Preparation of a room temperature degreasing agent

[0079] A room temperature degreasing agent was prepared in the same manner as in Example 1, except that sodium dioctyl sulfosuccinate (DOSS) was used as an anionic surfactant in an amount of 20 parts by weight.

[0080] Example 4: Preparation of a room-temperature degreasing agent

[0081] A room temperature degreasing agent was prepared in the same manner as in Example 1, except that lauryl glucoside (LGS) was used as a solubilizing agent in an amount of 10 parts by weight.

[0082] Example 5: Preparation of a room temperature degreasing agent

[0083] A room temperature degreasing agent was prepared in the same manner as in Example 1, except that lauryl glucoside (LGS) was used as a solubilizing agent in an amount of 20 parts by weight.

[0084] Example 6: Preparation of a room temperature degreasing agent

[0085] A room temperature degreasing agent was prepared in the same manner as in Example 1, except that EDTA-4Na was used as a chelating agent in an amount of 1 part by weight.

[0086] Example 7: Preparation of a room temperature degreasing agent

[0087] A room temperature degreasing agent was prepared in the same manner as in Example 1, except that EDTA-4Na was used as a chelating agent in an amount of 2.5 parts by weight.

[0088] Example 8: Preparation of a room-temperature degreasing agent

[0089] A room temperature degreasing agent was prepared in the same manner as in Example 1, except that a non-silicone defoaming agent (Saehan Silicon Lucky AB) was used as a defoaming agent in an amount of 1 part by weight.

[0090] Example 9: Preparation of a room temperature degreasing agent

[0091] A room temperature degreasing agent was prepared in the same manner as in Example 1, except that a non-silicone defoaming agent (Saehan Silicon Lucky AB) was used as the defoaming agent in an amount of 2.5 parts by weight.

[0092] Example 10: Preparation of a room temperature degreasing agent

[0093] A room temperature degreasing agent was prepared in the same manner as in Example 1, except that a Gemini pendant-type cationic surfactant represented by the above chemical formula 1 was used in an amount of 5 parts by weight.

[0094] Example 11: Preparation of a room temperature degreasing agent

[0095] A room temperature degreasing agent was prepared in the same manner as in Example 1, except that a Gemini pendant-type cationic surfactant represented by the above chemical formula 1 was used in an amount of 10 parts by weight.

[0096] Comparative Example 1: Preparation of Room Temperature Degreasing Agent

[0097] A room temperature degreasing agent was prepared in the same manner as in Example 1, except that sodium dioctyl sulfosuccinate (DOSS) was used as an anionic surfactant in an amount of 5 parts by weight.

[0098] Comparative Example 2: Preparation of Room Temperature Degreasing Agent

[0099] A room temperature degreasing agent was prepared in the same manner as in Example 1, except that sodium dioctyl sulfosuccinate (DOSS) was used as an anionic surfactant in an amount of 35 parts by weight.

[0100] Comparative Example 3: Preparation of Room Temperature Degreasing Agent

[0101] A room temperature degreasing agent was prepared in the same manner as in Example 1, except that lauryl glucoside (LGS) was used as a solubilizing agent in an amount of 5 parts by weight.

[0102] Comparative Example 4: Preparation of Room Temperature Degreasing Agent

[0103] A room temperature degreasing agent was prepared in the same manner as in Example 1, except that lauryl glucoside (LGS) was used as a solubilizing agent in an amount of 35 parts by weight.

[0104] Comparative Example 5: Preparation of Room Temperature Degreasing Agent

[0105] A room temperature degreasing agent was prepared in the same manner as in Example 1, except that EDTA-4Na was used as a chelating agent in an amount of 0.1 parts by weight.

[0106] Comparative Example 6: Preparation of Room Temperature Degreasing Agent

[0107] A room temperature degreasing agent was prepared in the same manner as in Example 1, except that EDTA-4Na was used as a chelating agent in an amount of 10 parts by weight.

[0108] Comparative Example 7: Preparation of Room Temperature Degreasing Agent

[0109] A room temperature degreasing agent was prepared in the same manner as in Example 1, except that a non-silicone defoaming agent (Saehan Silicon Lucky AB) was used as the defoaming agent in an amount of 0.1 parts by weight.

[0110] Comparative Example 8: Preparation of Room Temperature Degreasing Agent

[0111] A room temperature degreasing agent was prepared in the same manner as in Example 1, except that a non-silicone defoaming agent (Saehan Silicon Lucky AB) was used as the defoaming agent in an amount of 10 parts by weight.

[0112] Comparative Example 9: Preparation of Room Temperature Degreasing Agent

[0113] A room temperature degreasing agent was prepared in the same manner as in Example 1, except that a Gemini pendant-type cationic surfactant represented by Chemical Formula 1 was used in an amount of 0.1 parts by weight.

[0114] Comparative Example 10: Preparation of Room Temperature Degreasing Agent

[0115] A room temperature degreasing agent was prepared in the same manner as in Example 1, except that a Gemini pendant-type cationic surfactant represented by the above chemical formula 1 was used in an amount of 30 parts by weight.

[0116]

[0117] The compositions of the room temperature degreasing agents prepared in Examples 1 to 11 and Comparative Examples 1 to 10 above are summarized and shown in Table 1 below.

[0118] Sodium Hydroxide DOSSLGSEDTA-4Na Lucky AGPCS Example 16030305520 Example 26010305520 Example 36020305520 Example 46030105520 Example 56030205520 Example 66030301520 Example 76030302.5520 Example 86030305120 Example 960303052.520 Example 10603030555 Example 116030305510 Comparative Example 1605305520 Comparative Example 26035305520 Comparative Example 3603055520 Comparative Example 46030355520Comparative Example 56030300.1520Comparative Example 660303010520Comparative Example 760303050.120Comparative Example 860303051020Comparative Example 9603030550.1Comparative Example 106030305530

[0119] Evaluation Example 1: Evaluation of Degreasing Efficacy of Room Temperature Degreasing Agent

[0120] Each of the room temperature degreasing agents prepared in Examples 1 to 10 and Comparative Examples 1 to 10 above was diluted in water to a concentration of 10% by weight to prepare 21 types of room temperature degreasing solutions. Subsequently, a "steel plate with rolling oil on its surface" was degreased using each of the room temperature degreasing solutions according to the process shown in FIG. 3 (which simulates the immersion degreasing tank (110) and the room temperature degreasing solution brush roll (BR1) in the degreasing process (100) of FIG. 1), and then the degreasing rate and whiteness were measured, and the results are shown in Table 2 and Table 3 below, respectively. Here, the degreasing rate was calculated according to the following Equation 1. In addition, the whiteness was measured using a whiteness measuring device (AWM-216 portable whiteness tester).

[0121] [Mathematical Formula 1]

[0122] Degreasing rate (parts by weight) = (Weight of steel sheet before degreasing - Weight of steel sheet after degreasing) / (Weight of steel sheet before degreasing) × 100

[0123]

[0124] Degreasing Rate by Temperature (Weight%) 20℃ 30℃ 40℃ 50℃ Example 198.698.999.399.6 Example 298.198.399.099.2 Example 398.398.499.299.3 Example 498.198.699.099.2 Example 598.298.799.299.5 Example 698.398.699.099.3 Example 798.298.799.299.4 Example 898.198.499.199.4 Example 998.398.599.299.6 Example 1098.498.599.099.4 1198.698.899.199.5 Comparative Example 187.087.288.488.5 Comparative Example 287.488.388.789.1 Comparative Example 387.287.688.388.6 Comparative Example 487.588.188.588.7 Comparative Example 587.388.488.588.7 Comparative Example 687.687.988.789.0 Comparative Example 787.187.588.188.7 Comparative Example 887.288.188.688.9 Comparative Example 987.287.687.788.4 Comparative Example 1087.587.688.188.6

[0125] Whiteness by Temperature Blank 20℃ 30℃ 40℃ 50℃ Example 1 96.8 90.9 91.5 92.1 92.6 Example 2 90.3 90.6 91.1 91.9 Example 3 90.5 90.8 91.592 Example 4 90.4 90.7 91.592.3 Example 5 90.7 91.1 91.7 92.5 Example 6 90.6 91 91.8 92.4 Example 7 90.8 91.4 92.0 92.5 Example 8 90.3 91.0 92.1 92.4 Example 9 90.8 91.3 92.0 92.3 Example 10 90.5 91.4 91.9 92.3 Example 1190.491.292.092.5 Comparative Example 188.488.789.389.8 Comparative Example 288.388.989.590.1 Comparative Example 388.188.489.189.5 Comparative Example 488.589.189.690.0 Comparative Example 588.488.689.489.6 Comparative Example 688.789.489.890.2 Comparative Example 788.088.388.889.5 Comparative Example 888.889.389.490.2 Comparative Example 987.888.188.689.2 Comparative Example 1088.889.389.790.3

[0126] Referring to Tables 2 and 3 above, the room temperature degreasing agents prepared in Examples 1 to 10 were found to have superior degreasing performance, expressed as degreasing rate and whiteness, compared to the room temperature degreasing agents prepared in Comparative Examples 1 to 10. If the room temperature degreasing agents prepared in Examples 1 to 10 are applied to the degreasing process (100) shown in Fig. 1 instead of the process shown in Fig. 3 to degrease a "steel plate with rolling oil on its surface," then electrolytic degreasing and hot water brushing processes are added in addition to the immersion degreasing and room temperature degreasing liquid brushing processes. Therefore, it is obvious to a person skilled in the art that the degreasing rate and whiteness will increase compared to the values ​​listed in Tables 2 and 3.

[0127] Those skilled in the art to which the present invention pertains will understand that the present invention may be implemented in other specific forms without altering its technical concept or essential features. Therefore, the embodiments described above should be understood as illustrative in all respects and not restrictive. The scope of the present invention is defined by the claims set forth below rather than by the detailed description above, and all modifications or variations derived from the meaning and scope of the claims and equivalent concepts should be interpreted as being included within the scope of the present invention.

[0128] [Explanation of the symbol]

[0129] 100: Degreasing process

[0130] 110: Immersion degreasing tank

[0131] 120: Electrolytic degreasing tank

[0132] 130: Hot water jet tank

[0133] BR1: Room temperature degreasing brush roll

[0134] BR2: Hot water brush roll

Claims

1. comprising 5 to 60 parts by weight of an alkali agent alone or in two or more types, 10 to 30 parts by weight of an anionic surfactant alone or in two or more types, 10 to 30 parts by weight of a solubilizing agent alone or in two or more types, 1 to 5 parts by weight of a chelating agent alone or in two or more types, 1 to 5 parts by weight of an antifoaming agent, and 1 to 20 parts by weight of a Gemini pendant-type cationic surfactant, The above-mentioned Gemini pendant-type cationic surfactant is a room temperature degreasing agent applicable at room temperature, represented by the following chemical formula 1: [Chemical Formula 1] In the above chemical formula 1, R1 and R4 are the same or different, and each is independently an alkyl or alkenyl having 5 to 30 carbon atoms, and R2, R3, R5, and R6 are identical or different, each independently an alkyl having 1 to 5 carbon atoms, and said alkyl may be substituted or unsubstituted, and m and n are each independently integers from 1 to 10, and X is a halogen element, and S is a linker.

2. In Paragraph 1, A room temperature degreasing agent applicable at room temperature, comprising one or more alkaline agents selected from the group consisting of sodium hydroxide, sodium carbonate, sodium orthosilicate, sodium metasilicate, sodium phosphate, and potassium hydroxide.

3. In Paragraph 1, The above-mentioned anionic surfactant is a room temperature degreasing agent applicable at room temperature, comprising one or more selected from the group consisting of sodium dioctyl sulfosuccinate, sodium fatty acid, alkyl polyoxyethylene sulfate, alkylbenzene sulfonate, and monoalkyl phosphate.

4. In Paragraph 1, The above-mentioned solubilizing agent is a room temperature degreasing agent applicable at room temperature, comprising one or more selected from the group consisting of lauryl glucoside, ethanol, monoethylene glycol, diethylene glycol, propylene glycol, and hexylene glycol.

5. In Paragraph 1, The above-mentioned chelating agent comprises one or more selected from the group consisting of EDTA (ethylene diaminetetraacetic acid), EDTA-2Na (disodium ethylenediaminetetraacetate), EDTA-4Na (tetrasodium ethylenediaminetetraacetate), HEDTA (hydroxyeter ethylenediamine triacetic acid), NTA (nitrilotriacetic acid), DTPA (diethylentriamine pentaacetic acid), and oxalic acid, and is a room temperature degreasing agent applicable at room temperature.

6. In Paragraph 1, The above defoaming agent is a room temperature degreasing agent applicable at room temperature, comprising one or more selected from silicone-based defoaming agents or non-silicone-based defoaming agents.

7. A room temperature degreasing solution applicable at room temperature, comprising a room temperature degreasing agent applicable at room temperature according to any one of claims 1 to 6.

8. In Paragraph 7, A room temperature degreasing solution applicable at room temperature, comprising 1 to 50 weight percent of the above-mentioned room temperature degreasing agent applicable at room temperature.

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