Cleaning agent for cold-rolled stainless steel sheet and method for producing the same

Abstract

The present application relates to a kind of cleaning agent for cold-rolled stainless steel plate and its preparation method, the cleaning agent includes A component and B component, with the total mass of component A being 100%, component A includes: ethanolamine 18%-25%, triethanolamine 7%-15%, 2-amino-2-methyl-1-propanol 2%-5%, acetone glycerol 3%-6%, the rest is deionized water;With the total mass of component B being 100%, component B includes: ethylenediamine tetraacetic acid 4%-8%, tartaric acid 3%-6%, hydrolyzed maleic anhydride 5%-10%, oil removal auxiliary 3%-6%, fatty alcohol polyoxyethylene ether 2%-5%, dodecylamine polyoxyethylene ether 2%-4%, low-foaming non-ionic surface treatment agent 1%-3%, the rest is deionized water.Compared with existing cleaning agent for cold-rolled stainless steel plate, the cleaning agent is safe and environmentally friendly, low-foaming, and does not have the problem of alkali corrosion, and has excellent oil removal and ash removal effect.

Description

TECHNICAL FIELD

[0001] The present application relates to a cleaning agent for cold-rolled stainless steel plate and a preparation method thereof, and belongs to the technical field of industrial cleaning. BACKGROUND

[0002] In recent years, the production of stainless steel in China has been increasing year by year. Cold-rolled stainless steel plate has been widely used in various departments of the national economy such as building decoration, catering utensils, instruments and meters, chemical industry, automobile manufacturing, household appliances, environmental protection equipment, electronic information, and rail transportation, due to its high strength, corrosion resistance, good processability, wear resistance, and beautiful appearance. During the rolling process of cold-rolled stainless steel plate, rolling liquid is usually used to lubricate, cool and temporarily prevent rust on the steel plate. The rolling liquid usually contains a large amount of oil, extreme pressure anti-wear agent, coupling agent, antioxidant, etc. After rolling is completed, the oil and black ash generated during rolling will remain on the surface of the steel plate. Therefore, before continuous annealing of the rolled steel plate, the surface needs to be cleaned to prevent oil stains and black ash from carbonizing the surface of the steel plate during annealing, causing carburization and forming carbon stains, thereby affecting the performance and quality of the steel plate during subsequent coating or other surface processing. Therefore, a degreasing agent or cleaning agent is needed to remove oil, stains, and black ash on the surface of the cold-rolled stainless steel plate. Due to the high speed of the rolling mill and the short cleaning time, the current market cleaning agent does not completely remove the oil. In addition, the ash removal problem has not been effectively solved, and the black ash accumulates more and more on the loop rubber roller, forming an oil sludge, which needs to be removed after a period of time, reducing the production efficiency.

[0003] The Chinese invention patent with publication number CN102400162B discloses a cleaning agent suitable for stainless steel cold-rolled pieces, which is made by mixing the following raw materials in the following weight percentages: water 31.6%-65.8%, citric acid 7%-14%, oxalic acid 11%-22%, sodium molybdate 0.2%-0.4%, triethanolamine 5%-10%, fatty alcohol polyoxyethylene ether 8%-16%, alkylphenol polyoxyethylene ether 1%-2%, hydrochloric acid 1%-2%, and the rest is hydrofluoric acid. The cleaning agent has a lot of foam during use, the oil removal effect is general, the ash removal effect is poor, and the use of alkylphenol polyoxyethylene ether is not environmentally friendly. In addition, the use of regulated hazardous substances such as hydrochloric acid and hydrofluoric acid is dangerous when used. The Chinese invention patent with publication number CN1098748 discloses a cleaning agent for cleaning cold-rolled silicon steel sheets, which contains sodium hydroxide 20-30%, sodium silicate 50-60%, sodium tripolyphosphate 10-15%, alkylphenol polyoxyethylene ether 1-6%, and fatty alcohol polyoxyethylene ether 1-6%. The cleaning agent has a lot of foam and general cleaning effect when used, and contains environmentally unfriendly phosphates and alkylphenol polyoxyethylene ether. The Chinese invention patent with publication number CN100560803C discloses an alkaline detergent composition for steel sheets, which contains 33-42% sodium hydroxide, 0.5-20% alkyl polyoxyethylene ether surfactant, 1-8% water-soluble macromolecular carboxylic acid, and 0.5-15% aldobionic acid, and the rest is water. The Chinese invention patent with publication number CN112553635B discloses an environmentally friendly bubble-free liquid degreasing agent for cleaning before cold-rolled continuous annealing, which is composed of the following components per 1000 mL: 200-300 g of alkaline substance, 30-150 g of detergent builder, 10-60 g of surfactant, and the rest is desalted water. The surfactant is a specially modified EO / PO block aliphatic polyoxyethylene ether, and the alkaline substance is sodium hydroxide or potassium hydroxide. The two cleaning agents have poor ash removal effect, and use a large amount of sodium hydroxide, which is easy to produce residue, mix with black ash, and be adsorbed on the rubber roller. The more black ash accumulates, the more oil sludge is formed, which can be adsorbed on the stainless steel plate in the opposite direction. After high-temperature annealing, for 201 stainless steel with poor corrosion resistance, the product will produce alkali corrosion after 15 days of storage, and problems such as pitting will occur, reducing the product grade.

[0004] In summary, the existing cleaning agents have the following problems:

[0005] 1) Due to the short cleaning time, the existing cleaning agents generally have general oil removal effect and poor ash removal effect, which is easy to form oil sludge on the rubber roller, and the rubber roller needs to be cleaned regularly, reducing the production efficiency.

[0006] 2) Some cleaning agents use alkylphenol polyoxyethylene ether, which is not environmentally friendly and has a lot of foam, requiring additional defoaming agent.

[0007] 3) Some cleaning agents use inorganic salts containing phosphorus such as sodium tripolyphosphate in order to maintain a high oil removal rate, which is easy to cause environmental pollution.

[0008] 4) Some cleaning agents use a large amount of sodium hydroxide, potassium hydroxide, etc. Due to the short rinsing time, it is inevitable to cause residue, and the black ash that cannot be cleaned is adsorbed on the rubber roller to form an oil sludge, which is adsorbed on the stainless steel plate in the opposite direction. For 201 stainless steel with poor corrosion resistance, it is easy to form alkali corrosion. SUMMARY

[0009] The purpose of the present application is to solve the above-mentioned problems of the prior art, and to provide a cleaning agent for cold-rolled stainless steel plates, which does not contain alkylphenol polyoxyethylene ether, sodium tripolyphosphate, etc., is safe and environmentally friendly, has low foam, and has excellent oil and ash removal effect. The cleaning agent also does not contain inorganic bases such as sodium hydroxide and potassium hydroxide, so it will not cause alkali corrosion.

[0010] Another purpose of the present application is to provide a preparation method of the above-mentioned cleaning agent for cold-rolled stainless steel plates.

[0011] TECHNICAL SCHEME

[0012] A cleaning agent for cold-rolled stainless steel plates, comprising component A and component B;

[0013] The component A comprises the following components, based on the total mass of component A being 100%:

[0014]

[0015] The balance is deionized water;

[0016] The component B comprises the following components, based on the total mass of component B being 100%:

[0017]

[0018]

[0019] The balance is deionized water.

[0020] Further, the fatty alcohol polyoxyethylene ether is C9-11 alcohol polyoxyethylene ether (6).

[0021] Further, the dodecylamine polyoxyethylene ether is dodecylamine polyoxyethylene ether 10.

[0022] Further, the oil removal aid is Berol 226SA.

[0023] Further, the low-foaming non-ionic surface treatment agent is LFE-1410 of Dow Chemical Company.

[0024] The preparation method of the cleaning agent for the cold-rolled stainless steel plate:

[0025] (1) At room temperature, according to the above measurement ratio, add monoethanolamine, triethanolamine, acetone glycerol and 2-amino-2-methyl-1-propanol into deionized water in sequence, stir uniformly to obtain component A;

[0026] (2) According to the above measurement ratio, add ethylenediaminetetraacetic acid, tartaric acid and hydrolyzed maleic anhydride into deionized water in sequence, stir uniformly, then add oil removal aid, fatty alcohol polyoxyethylene ether, dodecylamine polyoxyethylene ether and low-foaming non-ionic surface treatment agent, stir uniformly to obtain component B.

[0027] The application of the cleaning agent in the cleaning of the stainless steel cold-rolled plate. The application method is: uniformly mix component A, component B and water in the cleaning agent in a mass ratio of 1:1:48 to obtain working solution, and then place the stainless steel cold-rolled plate in the working solution to clean at 65-75 DEG C.

[0028] Compared with the prior art, the present application has the following beneficial effects:

[0029] (1) The cleaning agent of the present application does not use traditional inorganic alkali, but uses organic alkali, which is easy to rinse and has less residue. Even if there is residue, it will decompose and volatilize at high temperature in the annealing furnace. Therefore, the cleaning agent is not only suitable for conventional stainless steel, but also suitable for low corrosion-resistant stainless steel cold-rolled plate such as 201;

[0030] (2) The cleaning agent of the present application contains various oil removal components, such as acetone glycerol, oil removal aid, dodecylamine polyoxyethylene ether, etc. Together, they can quickly strip the oil stains and have good oil removal effect.

[0031] (3) The cleaning agent of the present application contains ethylenediaminetetraacetic acid and tartaric acid. The two are compounded to have stronger chelation effect. Since they are not sodium salt, there is no need to worry about residue problem. The combination of dispersant hydrolyzed maleic anhydride can suspend the chelated black ash in the solution to prevent secondary settlement. The combination of the two can effectively remove the black ash on the surface of the stainless steel;

[0032] (4) The cleaning agent of the present application does not contain phosphorus and alkylphenol polyoxyethylene ether, which is safe and environmentally friendly;

[0033] (5) The cleaning agent of the present application has low foam, and does not need to add defoaming agent additionally. DETAILED DESCRIPTION

[0034] The technical solutions of the present application will be described in detail below in combination with specific embodiments.

[0035] For the convenience of comparison, in the following examples, the fatty alcohol polyoxyethylene ether used is C9-11 alcohol polyoxyethylene ether (6), model LIALET 91 / 60N, purchased from SACHEM, Germany; the oil removal aid used is Norion Berol 226SA; and the low-foam nonionic surface treatment agent used is LFE-1410 of Dow Chemical Company, but the application is not limited thereto.

[0036] Example 1

[0037] A cleaning agent for cold-rolled stainless steel plates comprises A component and B component, and the mass ratio of the A component to the B component is 1:1; the A component comprises the following components, based on the total mass of the A component being 100%:

[0038]

[0039] The B component comprises the following components, based on the total mass of the B component being 100%:

[0040]

[0041] A preparation method of the cleaning agent for cold-rolled stainless steel plates:

[0042] (1) At room temperature, add monoethanolamine, triethanolamine and 2-amino-2-methyl-1-propanol into deionized water in the above-mentioned metering ratio, stir uniformly, and obtain the A component;

[0043] (2) Add ethylenediaminetetraacetic acid, tartaric acid and hydrolyzed maleic anhydride into deionized water in the above-mentioned metering ratio, stir uniformly, then add the oil removal aid, the fatty alcohol polyoxyethylene ether, dodecylamine polyoxyethylene ether 10 and the low-foam nonionic surface treatment agent, stir uniformly, and obtain the B component.

[0044] Example 2

[0045] A cleaning agent for cold-rolled stainless steel plates comprises A component and B component, and the mass ratio of the A component to the B component is 1:1; the A component comprises the following components, based on the total mass of the A component being 100%:

[0046]

[0047] The B component comprises the following components, based on the total mass of the B component being 100%:

[0048]

[0049] A preparation method of the cleaning agent for cold-rolled stainless steel plates:

[0050] (1) At room temperature, add monoethanolamine, triethanolamine and 2-amino-2-methyl-1-propanol into deionized water in the above-mentioned metering ratio, stir uniformly to obtain A component;

[0051] (2) Add ethylenediaminetetraacetic acid, tartaric acid and hydrolyzed maleic anhydride into deionized water in the above-mentioned metering ratio, stir uniformly, then add oil removal aid, fatty alcohol polyoxyethylene ether, dodecylamine polyoxyethylene ether 10 and low-foaming non-ionic surface treatment agent, stir uniformly to obtain B component.

[0052] Example 3

[0053] A cleaning agent for cold-rolled stainless steel plate, comprising A component and B component, the mass ratio of A component and B component is 1:1; the component A comprises the following components, taking the total mass of component A as 100%:

[0054]

[0055] The component B comprises the following components, taking the total mass of component B as 100%:

[0056]

[0057] The preparation method of the above-mentioned cleaning agent for cold-rolled stainless steel plate:

[0058] (1) At room temperature, add monoethanolamine, triethanolamine and 2-amino-2-methyl-1-propanol into deionized water in the above-mentioned metering ratio, stir uniformly to obtain A component;

[0059] (2) Add ethylenediaminetetraacetic acid, tartaric acid and hydrolyzed maleic anhydride into deionized water in the above-mentioned metering ratio, stir uniformly, then add oil removal aid, fatty alcohol polyoxyethylene ether, dodecylamine polyoxyethylene ether 10 and low-foaming non-ionic surface treatment agent, stir uniformly to obtain B component.

[0060] Comparative Example 1

[0061] A cleaning agent for cold-rolled stainless steel plate, comprising A component and B component, the mass ratio of A component and B component is 1:1; the component A comprises the following components, taking the total mass of component A as 100%:

[0062]

[0063] The component B comprises the following components, taking the total mass of component B as 100%:

[0064]

[0065]

[0066] The preparation method of the cleaning agent for the cold-rolled stainless steel sheet:

[0067] (1) At room temperature, add monoethanolamine, triethanolamine and 2-amino-2-methyl-1-propanol into deionized water in the above-mentioned metering ratio, stir uniformly, and obtain component A;

[0068] (2) Add ethylenediaminetetraacetic acid, tartaric acid and hydrolyzed maleic anhydride into deionized water in the above-mentioned metering ratio, stir uniformly, and then add oil removal aid, fatty alcohol polyoxyethylene ether, dodecylamine polyoxyethylene ether 10 and low-foaming non-ionic surface treatment agent, stir uniformly, and obtain component B.

[0069] The cleaning agents of Examples 1-3 are tested for oil removal rate and ash removal effect, and are compared with the cleaning agent of Comparative Example 1 and a commercially available alkaline two-component stainless steel cold-rolled sheet cleaning agent (trade name PQX-4):

[0070] 1. Oil removal rate test

[0071] Test method: The cleaning agents of Examples 1-3 and Comparative Example 1 and PAX-4 are respectively prepared into working solutions. The working solution is prepared by mixing components A and B of the cleaning agent with water in a mass ratio of 1:1:48. Then, 201 stainless steel cold-rolled sheets are cleaned according to the standard method JB / T 4323.2-1999, and the oil removal rate test results are shown in Table 1:

[0072] Table 1

[0073] Example 1 Example 2 Example 3 PQX-4 Comparative Example 1 Oil removal rate 99.40％ 99.30％ 99.60％ 91.50％ 97.30％

[0074] As can be seen from the test results in Table 1, compared with the cleaning agent of Comparative Example 1 and the commercially available cleaning agent PQX-4, the cleaning agents of Examples 1-3 have higher oil removal rate for 201 stainless steel cold-rolled sheets and have better oil removal effect.

[0075] 2. Ash removal effect test

[0076] Test method: The cleaning agents of Examples 1-3 and Comparative Example 1 and PAX-4 are respectively prepared into working solutions. The working solution is prepared by mixing components A and B of the cleaning agent with water in a mass ratio of 1:1:48. Then, the working solution is placed in a water bath for standby. The water bath is set at a temperature of 65℃, and the washing time is 30s. Select 201 stainless steel cold-rolled sheets with oil and ash after rolling but without cleaning treatment, and clean them according to the established process (place the 201 stainless steel sheets on the washing machine, and then wash them at 65℃ for 30s). After cleaning, observe the ash removal. Ash removal is judged by wiping the surface of the workpiece with qualitative filter paper and observing whether the filter paper surface is ashed and blackened. The test results are shown in Table 2:

[0077] Table 2

[0078]

[0079] As can be seen from the test results of Table 2, the ash removal rates of the cleaning agents of Examples 1-3 of the present application are all higher than those of the cleaning agent of Comparative Example 1 and the commercially available cleaning agent PQX-4.

[0080] 3. Foam test

[0081] Test method: According to Chapter 10 of document JB / T 4323.2-1999. The cleaning agents of Examples 1-3 and Comparative Example 1 and PAX-4 were respectively prepared into working solutions. The working solution was prepared by mixing components A and B of the cleaning agent with water in a mass ratio of 1:1:48, and was preheated to 65°C±2°C for standby. The test solution was poured into a measuring cylinder so that the liquid surface was 70mm from the lower end surface of the cylinder plug, and was capped. After being placed in a water bath at 65°C±2°C for 10min, it was immediately shaken up and down for 1min at a distance of about 0.33m and a frequency of about 100-110 times / min. After shaking, the cylinder plug was opened, and the measuring cylinder containing the test solution was placed in a water bath or electric oven at 65°C±2°C for 10min. The foam disappearance was observed, and the height of the residual foam was recorded. The test results are shown in Table 3:

[0082] Table 3

[0083] Example 1 Example 2 Example 3 PQX-4 Comparative Example 1 Foam height (mm) 0 0 0 23 0

[0084] As can be seen from the test results of Table 3, the commercially available cleaning agent PQX-4 for stainless steel cold-rolled sheets has a high foam, and an additional defoaming agent needs to be added on site. The cleaning agents of Examples 1-3 and Comparative Example 1 of the present application have a low foam, and an additional defoaming agent does not need to be added.

[0085] 4. Alkali residue experiment

[0086] Test method: The cleaning agents of Examples 1-3 and Comparative Example 1 and PAX-4 were respectively prepared into working solutions. The working solution was prepared by mixing components A and B of the cleaning agent with water in a mass ratio of 1:1:48, and was preheated in a water bath. The water bath was set to a temperature of 65°C, and the cleaning time was 30s. An oil-coated and ash-coated 201 stainless steel cold-rolled sheet that had been rolled but not cleaned was selected. After cleaning, it was not rinsed, but was placed in a muffle furnace at 1000°C for drying (to simulate the process of on-site annealing), and the surface residue was observed by naked eye. The results are shown in Table 4:

[0087] Table 4

[0088]

[0089] As can be seen from the test results of Table 4, the cleaning agents of Examples 1-3 of the present application have no residue after cleaning 201 stainless steel cold-rolled sheets.

Claims

1. A cleaning agent for cold-rolled stainless steel sheets, characterized by comprising: a surfactant; and a water-soluble organic solvent. comprising a Group A component and a Group B component; the Group A component comprises the following components, based on 100% of the total mass of the Group A component: monoethanolamine 18%-25%; triethanolamine 7%-15%; 2-amino-2-methyl-1-propanol 2%-5%; acetone glycerol 3%-6%; the balance being deionized water; the Group B component comprises the following components, based on 100% of the total mass of the Group B component: ethylenediaminetetraacetic acid 4%-8%; tartaric acid 3%-6%; hydrolyzed maleic anhydride 5%-10%; degreasing aid 3%-6%; fatty alcohol polyoxyethylene ether 2%-5%; dodecylamine polyoxyethylene ether 2%-4%; low-foaming nonionic surface treatment agent 1%-3%; the balance being deionized water.

2. The cleaning agent for cold-rolled stainless steel sheets according to Claim 1, characterized by comprising: The fatty alcohol polyoxyethylene ether is C9-11 alcohol polyoxyethylene (6) ether.

3. The cleaning agent for cold-rolled stainless steel sheets according to Claim 1, characterized in that, The dodecylamine polyoxyethylene ether is dodecylamine polyoxyethylene (10) ether.

4. The cleaning agent for cold-rolled stainless steel sheets according to Claim 1, characterized in that, The degreasing aid is Berol 226SA.

5. The cleaning agent for cold-rolled stainless steel sheets according to Claim 1, characterized in that, The low-foaming nonionic surface treatment agent is LFE-1410 of Dow Chemical Company.

6. The method of producing a cleaning agent for cold-rolled stainless steel sheets according to any one of claims 1 to 5, characterized by, comprising the following steps: (1) at room temperature, monoethanolamine, triethanolamine, acetone glycerol and 2-amino-2-methyl-1-propanol are sequentially added to deionized water in a metered ratio, and stirred uniformly to obtain a Group A component; (2) ethylenediaminetetraacetic acid, tartaric acid and hydrolyzed maleic anhydride are sequentially added to deionized water in a metered ratio, and stirred uniformly, and then a degreasing aid, a fatty alcohol polyoxyethylene ether, a dodecylamine polyoxyethylene ether and a low-foaming nonionic surface treatment agent are added and stirred uniformly to obtain a Group B component.

7. Use of the cleaning agent of any one of claims 1-5 in cleaning of a stainless steel cold-rolled plate.

8. Use according to claim 7, wherein the compound is ###0002### The application method is: mixing the Group A component, the Group B component and water in a mass ratio of 1:1:48 to obtain a working solution, and then placing the stainless steel cold-rolled plate in the working solution and cleaning at 65-75°C.

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