CN112941527B - Environment-friendly normal-temperature degreasing agent and preparation method thereof - Google Patents

Environment-friendly normal-temperature degreasing agent and preparation method thereof Download PDF

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CN112941527B
CN112941527B CN202110124949.2A CN202110124949A CN112941527B CN 112941527 B CN112941527 B CN 112941527B CN 202110124949 A CN202110124949 A CN 202110124949A CN 112941527 B CN112941527 B CN 112941527B
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degreasing agent
environment
temperature
surfactant
friendly
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CN112941527A (en
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孙致平
贺亚刚
孙德松
张翠英
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Changzhou Vocational Institute of Engineering
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    • CCHEMISTRY; METALLURGY
    • C23COATING 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
    • C23GCLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G1/00Cleaning or pickling metallic material with solutions or molten salts
    • C23G1/14Cleaning or pickling metallic material with solutions or molten salts with alkaline solutions
    • C23G1/19Iron or steel

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

Abstract

The invention discloses an environment-friendly normal-temperature degreasing agent and a preparation method thereof, compared with the conventional alkaline degreasing agent, the environment-friendly normal-temperature degreasing agent avoids heat energy sources such as steam and the like consumed by high-temperature saponification, and the application temperature is 10-40 ℃, so that the cleaning energy consumption is greatly reduced, and the cleaning cost is saved; the composite material does not contain phosphorus, sulfur and silicon, and the adopted surfactant can be biologically degraded, and belongs to an environment-friendly degreasing agent; dirt such as greasy dirt and iron powder can be rapidly stripped and emulsified from the surface of the cold-rolled steel plate at the temperature of 10-40 ℃, then saponified, and sedimentation and separation of the dirt in a degreasing agent circulating tank are realized, so that the cleaned dirt is prevented from adhering to the surface of the steel plate along with circulating flowing of cleaning liquid again, the cleaning period is greatly shortened, the cold-rolled steel plate with high surface cleanliness is obtained, and the excellent adhesive force of a later-stage coating on the surface of the cold-rolled steel plate is ensured. The preparation method of the environment-friendly normal-temperature degreasing agent has the advantages of simple operation steps, high feasibility of preparation and implementation and strong practicability.

Description

Environment-friendly normal-temperature degreasing agent and preparation method thereof
Technical Field
The invention relates to the technical field of metal degreasing agents, in particular to an environment-friendly normal-temperature degreasing agent and a preparation method thereof.
Background
In the process of pickling and cold rolling cold rolled steel sheets (coils) such as cold rolled silicon steel sheets, automobile sheets and the like, rolling oil (emulsion) composed of various grease (such as natural grease, synthetic grease and the like), antirust agent, extreme pressure resistant agent and the like is generally used for lubricating, cooling and temporarily preventing rust of the rolled steel sheets, so that the rolling oil (mainly grease) remains on the surface after the rolling of the steel sheets is finished, and before the rolled steel sheets (coils) are continuously annealed, residual greasy dirt and iron powder remaining on the steel sheets in the rolling process must be removed by chemical degreasing, electrolytic degreasing and the like so as to prevent the carburization and the formation of carbonaceous dirty on the surfaces of the steel sheets caused by the carbonization of the residual greasy dirt and the iron powder in the annealing process, thereby avoiding the influence on the performance and quality of the steel sheets in the subsequent process of coating or other surface processing treatment. Thus, it is necessary to clean the surface of the cold-rolled steel sheet (coil) with degreasing agents to remove grease, dirt, iron powder, and the like. The degreasing process of the cold-rolled steel coil continuous annealing production line is generally provided with a spraying and brushing (brush roll reversely rotating) section, and an electrolytic degreasing section is additionally arranged on a high-speed (strip steel speed is more than 600 m/min) annealing line for further improving the surface quality. The main process parameters of these continuous annealing line degreasing sections are typically: the spray pressure of the degreasing agent is 0.2-0.4 MPa, and the cleaning temperature is 60-85 ℃.
In the prior patent literature, a plurality of special degreasing agent technical schemes for continuous annealing line production are disclosed: patent No. ZL93109825.4 discloses a cleaning agent for cleaning cold rolled silicon steel plates, which comprises 20-30% of sodium hydroxide, 50-60% of sodium silicate, 10-15% of sodium tripolyphosphate, 1-6% of alkylphenol ethoxylates and 1-6% of fatty alcohol ethoxylates, wherein the cleaning agent contains phosphate, and the surfactant also contains an alkylphenol ethoxylate compound (APEO) which is not environment-friendly, so that the foam of the degreasing agent is more and the cleaning effect is limited; patent No. ZL200510022869.7 discloses an alkaline detergent composition for electrolytic cleaning of cold rolled steel sheet, typically comprising 33-42% sodium hydroxide, 0.5-20% alkyl polyoxyethylene ether surfactant, 1-8% water-soluble macromolecular carboxylic acid and 0.5-15% aldonic acid, the balance being water, the alkaline detergent composition has higher alkali concentration and good fluidity, and still has good cleaning effect at low temperature (not higher than 50 ℃), in addition, the patent document also carries out cleaning effect comparison test on various polyoxyethylene alkyl ether surfactants; the patent number ZL200810123991.7 discloses an anti-emulsifying water-based metal cleaning agent, which is characterized in that greasy dirt can not be stably dispersed in the cleaning agent to form emulsion, but rather form larger oil particles to float on the surface of the cleaning agent for separation, wherein the formula comprises 3-7% of nonionic surfactant selected from fatty amine polyoxypropylene ether or alkylphenol polyether, 3-7% of zwitterionic surfactant selected from alkyl dimethylaminoacetic betaine and lauramidopropyl betaine, 1-5% of chelating agent selected from sodium citrate, tetra sodium ethylenediamine tetraacetate and sodium nitrilotriacetate, 1-5% of antirust agent selected from sodium tetraborate, sodium nitrite, sodium benzoate and long carbon chain carboxylic acid amine, 5-10% of inorganic builder selected from trisodium phosphate, sodium metasilicate, sodium carbonate, sodium bicarbonate and sodium hydroxide, and the balance of water; the patent number ZL201010201620.3 discloses a degreasing agent for producing a coated steel plate and a preparation method thereof, wherein the degreasing agent comprises 5-10% of polyethylene glycol as an additive, 10-15% of nonionic surfactant as a surfactant, 3-6% of one or more of molybdate, silicate and sodium benzoate as a corrosion inhibitor, and the balance of inorganic alkaline aqueous solution, and is characterized by having sufficient degreasing effect and being not easy to corrode a galvanized layer; patent No. ZL201210150010.4 discloses a special surfactant composition for spraying low-foam cleaning and a preparation method thereof, and the special surfactant composition has the advantages of low foam, good cleaning power, difficult precipitation in alkaline solution, easy rinsing, environmental protection and the like, and comprises the following components in parts by weight: 30-70 parts of fatty alcohol polyoxyethylene polyoxypropylene ether, 1-30 parts of tea saponin, 0.1-20 parts of fatty alcohol polyoxyethylene ether, 1-20 parts of span S-80, 0.01-1 part of cellulose and a pH value adjusting solution for adjusting the pH value to be 6-8, wherein the pH value adjusting solution is 30-50% potassium hydroxide solution; patent number ZL201110336935.3, disclose a cold-rolled sheet before hot galvanizing degreasing fluid, contain octyl phenol polyoxyethylene (10) ether 0.5-2.0%, sodium dodecyl benzene sulfonate 0.3-1.2%, sodium carbonate 3-5%, monoethanolamine 1-2%, sodium gluconate 2-4%, sodium hydroxide 22-30%, the rest is water, this patent has no phosphorus environmental protection, the long-term storage stability of liquid degreasing agent is good, there is no crystallization and liquid stratification, easy to use; the degreasing efficiency is high, the zinc plating is uniformly adhered, and the adhesion force of a zinc layer is strong; the patent number ZL201510091971.6 discloses a low-foam liquid degreasing agent for a continuous annealing production line of cold-rolled strip steel, which is prepared by adopting a novel low-foam surfactant prepared by epoxy modification of fatty alcohol and a phosphate surfactant to be compounded and dissolved in a high-concentration sodium hydroxide solution, and simultaneously using chemicals such as sodium gluconate, EDTA, HEDP, acrylate, polyacrylamide and the like as auxiliary agents to replace polyoxyethylene ether surfactants in the original degreasing agent, so that the consumption of the degreasing agent generated by foam for cleaning the strip steel is solved, and meanwhile, foam generated by an active agent brought in a previous procedure is also inhibited; the invention patent application 201510107576.2 discloses a degreasing agent for a cold rolling continuous annealing unit, which comprises 12-36% of sodium hydroxide, 0-6% of potassium hydroxide, 1-5% of sodium carbonate, 1-5% of trisodium phosphate, 1-6% of sodium gluconate, 0.5-2% of ethylenediamine tetraacetic acid, 0.5-2% of sodium polyacrylate, 0.5-2% of nonylphenol polyoxyethylene ether, 0.5-2% of anionic phosphate surfactant and the balance of desalted water.
In the published patent literature data, degreasing agents mainly depend on wetting and emulsifying effects of surfactants and saponification effects of inorganic alkali to achieve the effect of removing oil stains on the surface of strip steel; the degreasing agent solution is heated to the working temperature of 60-85 ℃, so that the saponification speed can be improved, and the degreasing effect can be accelerated.
In addition, phosphate, silicate and sulfur-containing substances are generally adopted as degreasing components in the conventional degreasing agents, wherein the phosphate is mainly used as an anionic surfactant and has emulsification and dispersion effects; the silicate is dissolved to obtain free base, and the dirt is saponified and removed by osmosis and expansion. As is well known, phosphorus and sulfur-containing substances have heavy environmental pollution, and strict index control is adopted; and silicate is very easy to adhere to the surface of the steel plate after cleaning, so that a coating on the surface of the steel plate is fogged and the combination of a substrate and the coating is affected.
For the development trend of degreasing agents, the key points are as follows: on the premise of guaranteeing the cleaning effect, the use cost of a user (steel mill) is reduced, the environment protection of raw materials is realized, and the requirement of simple post treatment of the cleaning wastewater is met. In the key points, the degreasing and cleaning working temperature is reduced, so that the consumption of heating steam (or electricity consumption and natural gas consumption) of a steel mill is reduced, and the core requirement of reducing the cost of the steel mill is achieved; the degreasing agent raw material environment protection requirement is achieved without using APEO-containing surfactant, inorganic salt containing phosphorus or surfactant. The degreasing agent for the continuous annealing line cleaning unit and the technical proposal thereof are still mostly made of all nonionic surfactant or anionic surfactant and nonionic surfactant compound systems, and the cleaning temperature is mainly high temperature (60 ℃ to 85 ℃). To reduce the cleaning temperature of the continuous annealing line, improve the environmental protection of the degreasing agent and remove the rolling oil and the iron powder (the total residual oil and the residual iron is less than or equal to 10 mg/m) remained on the surface of the cold-rolled steel plate 2 ) The bookThe patent provides an environment-friendly normal-temperature degreasing agent and a preparation method thereof.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide an environment-friendly normal-temperature degreasing agent and a preparation method thereof, compared with the conventional alkaline degreasing agent, the environment-friendly normal-temperature degreasing agent avoids heat energy sources such as steam and the like consumed by high-temperature saponification, and the application temperature is 10-40 ℃, so that the cleaning energy consumption is greatly reduced, and the cleaning cost is saved; the composite material does not contain phosphorus, sulfur and silicon, and the adopted surfactant can be biologically degraded, and belongs to an environment-friendly degreasing agent; dirt such as greasy dirt and iron powder can be rapidly stripped and emulsified from the surface of the cold-rolled steel plate at the temperature of 10-40 ℃, then saponified, and sedimentation and separation of the dirt in a degreasing agent circulating tank are realized, so that the cleaned dirt is prevented from adhering to the surface of the steel plate along with circulating flowing of cleaning liquid again, the cleaning period is greatly shortened, the cold-rolled steel plate with high surface cleanliness is obtained, and the excellent adhesive force of a later-stage coating on the surface of the cold-rolled steel plate is ensured. The preparation method of the environment-friendly normal-temperature degreasing agent has the advantages of simple operation steps, high feasibility of preparation and implementation and strong practicability.
In order to achieve the purpose, the technical scheme of the invention is to design an environment-friendly normal-temperature degreasing agent, which comprises the following components in percentage by mass: 10 to 12 percent of potassium hydroxide, 1 to 3 percent of chelating agent, 0.5 to 1 percent of fluorocarbon surfactant, 1 to 2 percent of amphoteric surfactant, 0.2 to 0.8 percent of cationic quaternary ammonium salt surfactant, 1.2 to 1.5 percent of nonionic surfactant and the balance of water.
The preferable technical scheme is that the chelating agent is tetrasodium glutamate diacetate, the fluorocarbon surfactant is of the model of Capstone FS-3100, the amphoteric surfactant is of the model of AMA LF70, the cationic quaternary ammonium salt surfactant is of the model of Ethoquad C/12, and the nonionic surfactant is of the model of Genapol EP2454.
Further preferable technical scheme is that the water is pure water.
In order to ensure the smooth preparation and application implementation of the environment-friendly normal-temperature degreasing agent, a preparation method of the environment-friendly normal-temperature degreasing agent is currently provided, which comprises the following steps:
s1: adding potassium hydroxide into pure water under the condition of stirring at normal temperature according to the mass percentage, and uniformly stirring to obtain a primary premixed solution;
s2: when the primary premixed solution is cooled to 5-40 ℃, adding tetra sodium glutamate diacetate into the primary premixed solution prepared in the step S1 according to the mass percent, and uniformly stirring to obtain a secondary premixed solution;
s3: according to the mass percentage, the Capstone FS-3100, the AMA LF70 and the Ethoquad C/12 are sequentially added into the secondary premix solution prepared in the step S2, and the mixture is stirred uniformly to obtain a tertiary premix solution;
s4: and (3) when the three-time premix solution is cooled to 5-35 ℃, adding Genapol EP2454 into the three-time premix solution prepared in the step (S3) under stirring, and uniformly stirring to obtain the environment-friendly normal-temperature degreasing agent.
In a further preferable technical scheme, in the step S2, the stirring time after the materials are added is 10-30 min; in the step S3, the stirring time after the materials are added is 10-60 min; in the step S4, the stirring time after the materials are added is 10-20 min.
The invention has the advantages and beneficial effects that:
1. compared with the conventional alkaline degreasing agent, the environment-friendly normal-temperature degreasing agent avoids heat energy sources such as steam and the like consumed by high-temperature saponification, and the application temperature is 10-40 ℃, so that the cleaning energy consumption is greatly reduced, and the cleaning cost is saved; the composite material does not contain phosphorus, sulfur and silicon, and the adopted surfactant can be biologically degraded, and belongs to an environment-friendly degreasing agent.
2. The environment-friendly normal-temperature degreasing agent is used for cleaning products such as cold-rolled steel plates and the like in a coil steel continuous annealing production line, does not need to be mixed with other components, does not need to be added with a defoaming agent, and is simple in cleaning operation steps.
3. According to the environment-friendly normal-temperature degreasing agent disclosed by the invention, dirt such as greasy dirt and iron powder can be rapidly stripped from the surface of a cold-rolled steel plate at the temperature of 10-40 ℃, emulsified and saponified, sedimentation and separation of the dirt in a degreasing agent circulating tank are realized, the cleaned dirt is prevented from adhering to the surface of the steel plate along with circulating flowing of cleaning liquid again, the cleaning period is greatly shortened, the cold-rolled steel plate with high surface cleanliness is obtained, and the excellent adhesive force of a later-stage coating on the surface of the cold-rolled steel plate is ensured.
4. The environment-friendly normal-temperature degreasing agent provided by the invention can be biodegraded, has good environmental friendliness, and is obvious in synergistic effect through a plurality of active components on the performances of saponification, decontamination, emulsification, clean cleaning and the like.
5. The preparation method of the environment-friendly normal-temperature degreasing agent has the advantages of simple operation steps, high feasibility of preparation and implementation and strong practicability.
Detailed Description
The following describes the invention in further detail with reference to examples. The following examples are only for more clearly illustrating the technical aspects of the present invention, and are not intended to limit the scope of the present invention.
Example 1
An environment-friendly normal-temperature degreasing agent comprises the following components in percentage by mass:
the preparation method of the environment-friendly normal-temperature degreasing agent in the embodiment 1 comprises the following steps:
s1: adding pure water into a stirring kettle provided with a thermometer, a stirrer and a dropping device according to the mass percentage, introducing cooling circulating water into a jacket of the stirring kettle, adding potassium hydroxide into the pure water in a stirring state, and uniformly stirring to obtain a primary premixed solution;
s2: when the primary premixed solution is cooled to 5-40 ℃, adding tetra sodium glutamate diacetate into the primary premixed solution prepared in the step S1 according to the mass percent, and stirring for 10-30 min to ensure that the solution is uniform, thus obtaining a secondary premixed solution;
s3: according to the mass percentage, the Capstone FS-3100, the AMA LF70 and the Ethoquad C/12 are sequentially added into the secondary premix solution prepared in the step S2, and the mixture is stirred for 10 to 60 minutes to ensure that the solution is uniform, thus obtaining a tertiary premix solution;
s4: and (3) when the three-time premixed solution is cooled to 5-35 ℃, adding Genapol EP2454 into the three-time premixed solution prepared in the step (S3) under stirring according to the mass percentage, and stirring for 10-20 min to ensure that the solution is uniform, thus obtaining the environment-friendly normal-temperature degreasing agent.
Example 2
An environment-friendly normal-temperature degreasing agent comprises the following components in percentage by mass:
the preparation method of an environment-friendly normal-temperature degreasing agent in example 2 is the same as that of the environment-friendly normal-temperature degreasing agent in example 1.
Example 3
An environment-friendly normal-temperature degreasing agent comprises the following components in percentage by mass:
the preparation method of an environment-friendly normal-temperature degreasing agent in example 3 is the same as that of the environment-friendly normal-temperature degreasing agent in example 1.
Example 4
An environment-friendly normal-temperature degreasing agent comprises the following components in percentage by mass:
the preparation method of an environment-friendly normal-temperature degreasing agent in example 4 is the same as that of the environment-friendly normal-temperature degreasing agent in example 1.
The environment-friendly type normal temperature degreasing agents prepared in examples 1 to 4 of the present invention were used in the normal temperature degreasing agent cleaning section of the continuous annealing line of cold rolled steel sheet, respectively, using the commercial degreasing agents (liquid high alkalinity degreasing agent, model: HH TZY-030, mashan hong quill Utility Co., ltd., cleaning at 60 to 85 ℃) as comparative examples, and the surface cleaning indexes of the cleaned cold rolled steel sheet are shown in Table 1.
Table 1 cleaning index of cold rolled steel sheets in comparative example and examples 1 to 4
The experimental data shown in table 1 demonstrate that: compared with the cleaning effect of the degreasing agent sold in the market in the comparative example on the cold rolled steel sheet, the cold rolled steel sheet cleaned by the environment-friendly normal-temperature degreasing agent prepared in the examples 1 to 4 has excellent surface quality, the surface reflectivity is more than or equal to 96 percent, and the total residual oil and residual iron on the surface of the steel sheet is less than or equal to 8mg/m 2 The adhesion of the subsequent coating of the cleaned cold rolled steel sheet can reach 1 level, which indicates that the surface of the cold rolled steel sheet after being cleaned by the environment-friendly normal-temperature degreasing agent has high cleanliness, and the adhesion of the coating of the subsequent process also reaches the same level of cleaning by the high-temperature degreasing agent sold in the market; the cleaning temperature of the environment-friendly normal-temperature degreasing agent prepared in the embodiments 1-4 can be as low as 10-40 ℃, and the degreasing agent cleaning liquid does not need to be additionally heated, so that the working energy consumption of the continuous annealing production line of the cold rolled steel plate is obviously reduced; when the normal-temperature degreasing agents prepared in the embodiments 1 to 4 are used, the normal-temperature degreasing agents are not required to be mixed with other components, and defoaming agents are not required to be added, so that the cleaning operation steps are simple; the environment-friendly normal-temperature degreasing agent prepared in the examples 1-4 does not contain phosphorus, sulfur and silicon, is easy to biodegrade and has good environment-friendliness.
Among them, potassium hydroxide, tetrasodium glutamate diacetate, capstone FS-3100, AMA LF70, ethoquad C/12 and Genapol EP2454 are all commercially available products.
Conventional alkaline degreasing agents generally have saponification, emulsification and chelation, and remove grease from the surface of the metal parts by wetting, infiltration, rolling-off, dispersion and solubilization. The environment-friendly normal-temperature degreasing agent disclosed by the invention has the advantages that potassium hydroxide is used as a basic alkali source, a high-alkalinity environment is provided for preparing the degreasing agent, the saponification speed of potassium salt to grease is faster than that of sodium salt, the required saponification temperature is low, and the formed potassium soap has better water solubility; the Capstone FS-3100 has excellent wettability, so that the surface of the strip steel is permeated, and dirt is helped to be separated; the AMA LF70 surfactant is beneficial to clarifying the degreasing agent and increasing the cloud point of the nonionic surfactant in the cleaning working solution, so that the good emulsifying property of the nonionic surfactant is exerted; the Ethoquad C/12 surfactant can make the condition of an oil-water interface clear, effectively reduce the oil content of the dehydrated water and make oil and iron powder layered and settled; the Genapol EP2454 surfactant has good oil emulsifying effect at normal temperature, has foam inhibiting and defoaming effects, and can reduce foam amount generated by potassium soap in the cleaning process. The normal-temperature phosphorus-free rapid degreasing agent can be biodegraded, has good environmental protection, and has obvious synergistic effect through the cooperation of various active components on the performances of saponification, decontamination, emulsification, clean cleaning and the like.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that it will be apparent to those skilled in the art that several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the scope of the invention.

Claims (4)

1. The environment-friendly normal-temperature degreasing agent is characterized by comprising the following components in percentage by mass: 10 to 12 percent of potassium hydroxide, 1 to 3 percent of chelating agent, 0.5 to 1 percent of fluorocarbon surfactant, 1 to 2 percent of amphoteric surfactant, 0.2 to 0.8 percent of cationic quaternary ammonium salt surfactant, 1.2 to 1.5 percent of nonionic surfactant and the balance of water;
the chelating agent is tetrasodium glutamate diacetate, the fluorocarbon surfactant is of the model of Capstone FS-3100, the amphoteric surfactant is of the model of AMALF70 surfactant, the cationic quaternary ammonium salt surfactant is of the model of Ethoquad C/12, and the nonionic surfactant is of the model of Genapol EP2454.
2. The environment-friendly normal temperature degreasing agent as claimed in claim 1, wherein the water is pure water.
3. A method for preparing the environment-friendly normal-temperature degreasing agent as claimed in claim 2, which comprises the following steps:
s1: according to the mass percent of claim 2, adding potassium hydroxide into pure water under the condition of stirring at normal temperature, and uniformly stirring to obtain a primary premixed solution;
s2: when the primary premixed solution is cooled to 5-40 ℃, adding tetra sodium glutamate diacetate into the primary premixed solution prepared in the step S1 according to the mass percent of the claim 2, and uniformly stirring to obtain a secondary premixed solution;
s3: according to the mass percent of claim 2, capstone FS-3100, AMA LF70 and Ethoquad C/12 are sequentially added into the secondary premix solution prepared in the step S2, and the mixture is uniformly stirred to obtain a tertiary premix solution;
s4: and (3) when the three-time premixed solution is cooled to 5-35 ℃, adding Genapol EP2454 into the three-time premixed solution prepared in the step (S3) under the stirring state according to the mass percent of the preparation method of the claim 2, and uniformly stirring to obtain the environment-friendly normal-temperature degreasing agent.
4. The method for preparing environment-friendly normal temperature degreasing agent as claimed in claim 3, wherein in the step S2, the stirring time after the material is added is 10-30 min; in the step S3, the stirring time after the materials are added is 10-60 min; in the step S4, the stirring time after the materials are added is 10-20 min.
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