Hydrocarbon cleaning agent for carburizing steel and use method thereof

Abstract

The invention relates to a hydrocarbon cleaning agent for carburizing steel and a use method thereof, and relates to the technical field of industrial cleaning agents, the hydrocarbon cleaning agent for carburizing steel comprises 0.01%-2% of a wetting dispersant, 0.01%-1% of a surfactant, 0.1%-2.5% of a corrosion inhibitor compound, and the balance of a mixture of n-alkanes and isoalkanes. The hydrocarbon cleaning agent can quickly form a very thin oil film protection layer on a cleaned metal surface, has a relatively long anti-rust performance, and also has water solubility, so that the cleaning agent can remove water-soluble pollutants such as water and dust, meanwhile, corrosion of a corrosive medium to the surface of a workpiece is avoided, and an anti-rust effect is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of industrial cleaning agents, and in particular to a hydrocarbon cleaning agent for carburizing steel and a use method thereof. Background Art

[0002] Hydrocarbons with good cleaning ability on the market have a flash point of less than 45°C and are flammable. They need additional explosion-proof measures to protect them. Choosing hydrocarbon solvents with a flash point higher than 45°C can eliminate the risk of explosion. High-flash-point hydrocarbon solvents are still insufficient in their ability to clean carbon deposits, waxy dirt from cutting oils and lubricants, inorganic polar dirt, and metal debris. After cleaning, the metal surface of 20CrMnTi low-carbon steel workpieces is easily corroded and rusted by external oxidation, moisture and other factors. The introduction of organic solvents into hydrocarbon solvents can be used to enhance the degreasing and oil removal effect, which poses an occupational health risk. In addition, long-term operation of cleaning equipment can easily lead to equipment sealing failures, resulting in steam overflow and contact with electrical equipment sparks, which poses a safety hazard of flash explosion. Summary of the invention

[0003] The invention provides a hydrocarbon cleaning agent for carburizing steel and a use method thereof, so as to solve the problem that corrosion and rust are easily generated on the workpiece after cleaning.

[0004] In a first aspect, the present invention provides a hydrocarbon cleaning agent for carburizing steel, comprising: Wetting and dispersing agent 0.01%~2% Surfactant 0.01~1% Corrosion inhibitor compound 0.1%~2.5% The balance is a mixture of normal alkanes and isoalkanes.

[0005] Preferably, the mixture of normal alkanes and isoalkanes includes normal carbon decanane, normal carbon undecane, and isoalkanes Isopar G and Isopar H, and the mixing volume ratio thereof is 3:5:1:1.

[0006] Preferably, the corrosion inhibitor compound includes octanoic acid, tricarboxylic acid, N,N-dimethyl-1,3-propylenediamine, and 2-ethylhexylamine, and the mass molar ratio thereof is 1:1:0.5:1.

[0007] Preferably, the mixture of normal alkanes and isoalkanes is a solvent having a boiling range of 140°C to 220°C.

[0008] In a second aspect, the present invention provides a method for a hydrocarbon cleaning agent for carburized steel as described in any embodiment of the first aspect, the specific steps are as follows: A. Place the workpiece to be cleaned in the first cleaning tank and perform ultrasonic immersion cleaning for 8-12 minutes. The cleaning liquid in the first cleaning tank is the hydrocarbon cleaning agent. B. Place the workpiece cleaned in step A into a second cleaning tank and perform ultrasonic immersion cleaning for 8-12 minutes, wherein the cleaning liquid in the second cleaning tank is the hydrocarbon cleaning agent; C. Place the workpiece cleaned in step B into a third cleaning tank and perform ultrasonic immersion cleaning for 6-14 minutes, wherein the cleaning liquid in the third cleaning tank is the hydrocarbon cleaning agent; D. Dry the workpiece cleaned in step C with hot air to complete the cleaning.

[0009] Preferably, in step A, the temperature of the cleaning liquid in the first cleaning tank is 43° C. to 47° C.

[0010] Preferably, the ultrasonic immersion cleaning in step A is performed for 10 minutes.

[0011] Preferably, the ultrasonic immersion cleaning in step B is performed for 10 minutes.

[0012] Preferably, the ultrasonic immersion cleaning in step C is performed for 10 minutes.

[0013] Preferably, in step D, the workpiece is dried with hot air under a negative pressure of 90 MPa, the hot air temperature is 80° C. to 140° C., and the drying time is 5 minutes.

[0014] The above technical solution provided by the embodiment of the present invention has the following advantages compared with the prior art: The flash point of the hydrocarbon cleaning agent is above 45°C, and it is highly safe. The wetting and dispersing agent can disperse the particles freely in the alkane solvent oil to prevent the particles from adhering to the surface of the product, making it easier for the circulating filtration system of the equipment to filter the particles, thus achieving a more ideal recovery and purification effect.

[0015] The hydrocarbon cleaning agent has strong solubility, which can destroy the protective film on the metal surface, thereby reducing the resistance of the metal to external factors such as oxidation and corrosion. The hydrocarbon cleaning agent of the present invention can quickly form a very thin oil film protective layer on the cleaned metal surface, which has a long anti-rust performance, and it is also water-soluble, so that the cleaning agent can remove water-soluble pollutants such as water and dust while avoiding the erosion of the workpiece surface by corrosive media, thereby achieving an anti-rust effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0018] Figure 1 A schematic flow chart of a method for using a hydrocarbon cleaning agent for carburized steel provided in an embodiment of the present invention; Figure 2 This is a picture showing the effect of the workpiece of Example 1 after being cleaned and placed in a hot and humid box at 35°C and 90% humidity for 24 hours; Figure 3 This is a picture showing the effect of the workpiece of Example 2 after being cleaned and placed in a hot and humid box at 35°C and 90% humidity for 24 hours; Figure 4 This is a picture showing the effect of the workpiece of Example 3 after being cleaned and placed in a hot and humid box at 35°C and 90% humidity for 24 hours; Figure 5 This is a picture showing the effect of the workpiece of comparative example 1 after being cleaned and placed in a hot and humid box at 35°C and 90% humidity for 24 hours; Figure 6 This is a picture showing the effect of the workpiece of Comparative Example 2 after being cleaned and placed in a hot and humid box at 35°C and 90% humidity for 24 hours; Figure 7 This is a diagram showing the effect of the workpiece of Comparative Example 3 after being cleaned and placed in a hot and humid box at 35°C and 90% humidity for 24 hours. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] Example 1 A mixture of normal alkanes and isoalkanes (normal carbon decanane, normal carbon undecane, isoalkanes Isopar G, Isopar H=3:5:1:1) 98%, sorbitan fatty acid ester S-20 0.05%, 2-amino 2-hydroxymethyl 1,3-propanediol 0.05%, and a corrosion inhibitor compound 1%.

[0021] Furthermore, the surfactant is one or more of sorbitan fatty acid ester S-20, alkylphenol polyoxyethylene ether OP-4, and isomeric alcohol polyoxyethylene ether. The dosage is 0.01-1% by mass. The emulsification and decontamination effect is not ideal if the dosage is lower than 0.01%, and residues are easy to remain if the dosage is too high.

[0022] Furthermore, the dispersing wetting agent is, for example, one or more of 2-amino 2-hydroxymethyl 1,3-propanediol, acetylene glycol nonionic low foaming wetting agent Surfynol 2502, etc.

[0023] In addition, the corrosion inhibition compound is prepared by mixing octanoic acid, tricarboxylic acid, N,N-dimethyl-1,3-propylenediamine and 2-ethylhexylamine in a mass molar ratio of 1:1:0.5:1, and stirring at a constant temperature of 50-60°C for 1 hour in a reactor. The pH is adjusted to 8.0-9.0. The dosage is 0.1-2.5% by mass. The corrosion inhibition effect is not ideal if it is lower than 0.1%, and no obvious effect is achieved if it is too high.

[0024] See also Figure 1 , the use of hydrocarbon cleaning agent for carburizing steel, the specific steps are as follows: A. Place the workpiece to be cleaned in the first cleaning tank containing hydrocarbon cleaning agent for cleaning, with an ultrasonic frequency of 40KHz, soaking for 10 minutes, a soaking temperature of 45°C, and a soaking pressure of 1.0MPa. Remove the oil and metal particles generated by the machining process of 20CrMnTi carbon steel material; B. Place the workpiece cleaned in step A into the second cleaning tank containing hydrocarbon cleaning agent for cleaning at an ultrasonic frequency of 40KHz, soaking for 10 minutes, at a soaking temperature of 45°C and a soaking pressure of 1.0MPa. Rinse the residue of 20CrMnTi carbon steel material; C. Place the workpiece cleaned in step B into a third cleaning tank containing hydrocarbon cleaning agent for cleaning at an ultrasonic frequency of 40KHz; D. Then carry out hot air drying under negative pressure of 90 MPa, the hot air temperature is 80℃-140℃, and the drying time is 5 minutes.

[0025] In one embodiment, the hydrocarbon is a normal or isomeric alkane with a boiling range of 140-220° C., a narrow boiling point range, no water mark residue due to inconsistent drying, etc., can be volatilized quickly and completely, has a good distillation recovery effect, and a high recycling rate. It does not contain ODS ozone-destroying substances, is harmless to humans, and is environmentally friendly.

[0026] Example 2 A mixture of normal alkanes and isoalkanes (normal carbon decanane, normal carbon undecane, isoalkanes Isopar G, Isopar H=3:5:1:1) 96.5%, alkylphenol polyoxyethylene ether OP-4 0.5%, acetylene glycol non-ionic low foaming wetting agent Surfynol 25020.5%, and a corrosion inhibitor compound 2.5%.

[0027] The method of using the hydrocarbon cleaning agent for carburizing steel is the same as that in Example 1.

[0028] Example 3 A mixture of normal alkanes and isoalkanes (normal carbon decanane, normal carbon undecane, isoalkanes Isopar G, Isopar H=3:5:1:1) 97.5%, C8-C13 isomeric alcohol polyoxyethylene ether 1%, 2-amino 2-hydroxymethyl 1,3-propylene glycol 0.5%, and a corrosion inhibitor compound 1%.

[0029] The method of using the hydrocarbon cleaning agent for carburizing steel is the same as that in Example 1.

[0030] Example 4 A mixture of normal alkanes and isoalkanes (normal carbon decanane, normal carbon undecane, isoalkanes Isopar G, Isopar H=3:5:1:1) 95.25%, alkylphenol polyoxyethylene ether OP-4 0.25%, acetylene glycol non-ionic low foaming wetting agent Surfynol 250 22%, and a corrosion inhibitor compound 2.5%.

[0031] The method of using the hydrocarbon cleaning agent for carburizing steel is the same as that in Example 1.

[0032] Example 5 A mixture of normal alkanes and isoalkanes (normal carbon decanane, normal carbon undecane, isoalkanes Isopar G, Isopar H=3:5:1:1) 97.8%, sorbitan fatty acid ester S-20 0.1%, alkylphenol polyoxyethylene ether OP-4 0.1%, acetylene glycol non-ionic low foaming wetting agent Surfynol 250 20.5%, and corrosion inhibitor compound 1.5%.

[0033] The method of using the hydrocarbon cleaning agent for carburizing steel is the same as that in Example 1.

[0034] Example 6 A mixture of normal alkanes and isoalkanes (normal carbon decanane, normal carbon undecane, isoalkanes Isopar G, Isopar H=3:5:1:1) 95%, sorbitan fatty acid ester S-20 1%, alkylphenol polyoxyethylene ether OP-4 0.5%, 2-amino 2-hydroxymethyl 1,3-propanediol 1%, acetylene glycol non-ionic low-foaming wetting agent Surfynol 25020.5%, and corrosion inhibitor compound 2%.

[0035] The method of using the hydrocarbon cleaning agent for carburizing steel is the same as that in Example 1.

[0036] Example 7 A mixture of normal alkanes and isoalkanes (normal carbon decanane, normal carbon undecane, isoalkanes Isopar G, Isopar H=3:5:1:1) 96.5%, C8-C13 isomeric alcohol polyoxyethylene ether 0.5%, acetylene glycol non-ionic low foaming wetting agent Surfynol 25021.5%, and a corrosion inhibitor compound 1.5%.

[0037] The method of using the hydrocarbon cleaning agent for carburizing steel is the same as that in Example 1.

[0038] Example 8 Mixture of normal alkanes and isoalkanes (normal carbon decanane, normal carbon undecane, isoalkanes Isopar G, Isopar H=3:5:1:1) 96.4%, sorbitan fatty acid ester S-20 1%, alkylphenol polyoxyethylene ether OP-4 1%, 2-amino 2-hydroxymethyl 1,3-propanediol 1.5%, and corrosion inhibitor compound 0.1%.

[0039] The method of using the hydrocarbon cleaning agent for carburizing steel is the same as that in Example 1.

[0040] Example 9 A mixture of normal alkanes and isoalkanes (normal carbon decanane, normal carbon undecane, isoalkanes Isopar G, Isopar H=3:5:1:1) 98.75%, C8-C13 isomeric alcohol polyoxyethylene ether 0.25%, sorbitan fatty acid ester S-20 0.25%, alkylphenol polyoxyethylene ether OP-4 0.25%, acetylene glycol non-ionic low foaming wetting agent Surfynol 2502 0.25%, and corrosion inhibitor compound 0.25%.

[0041] The method of using the hydrocarbon cleaning agent for carburizing steel is the same as that in Example 1.

[0042] Example 10 A mixture of normal alkanes and isoalkanes (normal carbon decanane, normal carbon undecane, isoalkanes Isopar G, Isopar H=3:5:1:1) 98%, sorbitan fatty acid ester S-20 0.5%, acetylene glycol non-ionic low foaming wetting agent Surfynol 250 22%, and a corrosion inhibitor compound 2%.

[0043] The method of using the hydrocarbon cleaning agent for carburizing steel is the same as that in Example 1.

[0044] Embodiment 11 A mixture of normal alkanes and isoalkanes (normal carbon decanane, normal carbon undecane, isoalkanes Isopar G, Isopar H=3:5:1:1) 98%, sorbitan fatty acid ester S-20 0.1%, alkylphenol polyoxyethylene ether OP-4 0.1%, acetylene glycol non-ionic low foaming wetting agent Surfynol 2502 0.05%, and corrosion inhibitor compound 2%.

[0045] The method of using the hydrocarbon cleaning agent for carburizing steel is the same as that in Example 1.

[0046] Example 12 A mixture of normal alkanes and isoalkanes (normal carbon decanane, normal carbon undecane, isoalkanes Isopar G, Isopar H=3:5:1:1) 98%, sorbitan fatty acid ester S-20 0.1%, alkylphenol polyoxyethylene ether OP-4 0.1%, acetylene glycol non-ionic low foaming wetting agent Surfynol 2502 0.05%, and corrosion inhibitor compound 2%.

[0047] The method of using the hydrocarbon cleaning agent for carburizing steel is the same as that in Example 1.

[0048] Comparative Example 1 The cleaning agent consists of: 100% n-nonane. The method of using the cleaning agent is the same as that in Example 1.

[0049] Comparative Example 2 The cleaning agent consists of 50% n-nonane and 40% isoparaffin Isopar G. The method of using the cleaning agent is the same as in Example 1.

[0050] Comparative Example 3 The cleaning agent comprises: 60% n-decane, 35% n-undecane, and 5% dipropylene glycol methyl ether (DPM). The method of using the cleaning agent is the same as that in Example 1.

[0051] Comparative Example 4 The cleaning agent consists of: 60% n-decane, 15% n-decane, 15% isoparaffin Isopar H, 10% 3-methoxy-3-methyl-1-butanol (MMB), and N-methylpyrrolidone (NMP). The method of using the cleaning agent is the same as in Example 1.

[0052] Comparative Example 5 The cleaning agent comprises: 60% of isoparaffin Isopar G, 25% of n-nonane, 10% of propylene glycol methyl ether acetate (PMA), and 5% of ethyl lactate. The method of using the cleaning agent is the same as that in Example 1.

[0053] Comparative Example 6 The cleaning agent consists of: 50% n-decane, 20% n-nonane, 20% isoparaffin Isopar G, and 10% fatty alcohol polyoxyethylene ether phosphate. The method of using the cleaning agent is the same as in Example 1.

[0054] Test results are based on: 1. Cleaning ability evaluation: After cooling the workpieces of different test groups, use 36, 38, and 40 dyne pens to draw straight lines for detection: The lines of 36, 38, and 40 dyne pens are smooth within 3 seconds, and the surface oil cleaning effect is passed, which is evaluated as A. The lines of 36 and 38 dyne pens are smooth within 3 seconds, and the 40 dyne pen has a straight line fault and is not smooth within 3 seconds, which is evaluated as B. The lines of 36 dyne pen are smooth within 3 seconds, and the lines of 38 and 40 dyne pens are not smooth within 3 seconds, which is evaluated as C. The lines of 36 and 38 dyne pens are not smooth within 3 seconds, which is evaluated as D.

[0055] 2. Anti-rust performance evaluation: Put the cleaned workpieces of different test groups into a hot and humid box at 35℃ and 90% humidity for 24 hours, and observe the rust condition. Level 0 means no rust; Level 1 means slight rust; Level 2 means heavy rust; Level 3 means severe rust.

[0056] 3. Cleanliness assessment: Clean the workpieces of different test groups, filter the filter membrane through which the cleaning liquid passes, collect the dirt on the surface of the 5μm polyethylene (PET) mesh filter membrane, then dry the filter membrane, inspect it under light with a microscope, count the dirt particles according to particle size and number, and evaluate the cleanliness level according to the particle cleanliness standard in the ISO 16232 VDA 19 guide (see the cleanliness level determination table below).

[0057]

[0058] 4. Flash point test: Use ASTM D7094-2017 closed cup flash point test method to test the flash point (closed cup) of different test groups.

[0059] See also Figure 2-7 , the test results are as follows:

[0060] The embodiments of the present invention can achieve the following advantages: The flash point of the hydrocarbon cleaning agent is above 45°C, and it is highly safe. The wetting and dispersing agent can disperse the particles freely in the alkane solvent oil to prevent the particles from adhering to the surface of the product, making it easier for the circulating filtration system of the equipment to filter the particles, thus achieving a more ideal recovery and purification effect.

[0061] The hydrocarbon cleaning agent has strong solubility, which will destroy the protective film on the metal surface, thereby reducing the metal's resistance to external factors such as oxidation and corrosion. The hydrocarbon cleaning agent can quickly form a very thin oil film protective layer on the cleaned metal surface, which has a long anti-rust performance. It is also water-soluble, so that the cleaning agent can remove water-soluble pollutants such as water and dust while avoiding the erosion of the workpiece surface by corrosive media, achieving an anti-rust effect.

[0062] The above-described embodiments are only specific implementations of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A hydrocarbon cleaning agent for carburizing steel, characterized in that: Its constituent components and their weight percentage ranges are: Wetting and dispersing agent 0.01%~2% Surfactant 0.01~1% Corrosion inhibitor compound 0.1%~2.5% The balance is a mixture of normal alkanes and isoalkanes.

2. The hydrocarbon cleaning agent for carburizing steel according to claim 1, characterized in that: The normal alkane and isoalkane mixture includes normal carbon decanane, normal carbon undecane, isoalkane Isopar G and Isopar H, and the mixing volume ratio thereof is 3:5:1:

1.

3. The hydrocarbon cleaning agent for carburizing steel according to claim 1, characterized in that: The corrosion inhibitor compound comprises n-octanoic acid, tricarboxylic acid, N,N-dimethyl-1,3-propylenediamine and 2-ethylhexylamine, and the mass molar ratio thereof is 1:1:0.5:

1.

4. The hydrocarbon cleaning agent for carburizing steel according to claim 1, characterized in that: The normal alkane and isoalkane mixture is a solvent with a boiling range of 140°C to 220°C.

5. A method for using the hydrocarbon cleaning agent for carburizing steel as claimed in any one of claims 1 to 4, characterized in that: The specific steps are as follows: A. Place the workpiece to be cleaned in the first cleaning tank and perform ultrasonic immersion cleaning for 8-12 minutes. The cleaning liquid in the first cleaning tank is the hydrocarbon cleaning agent. B. Place the workpiece cleaned in step A into a second cleaning tank and perform ultrasonic immersion cleaning for 8-12 minutes, wherein the cleaning liquid in the second cleaning tank is the hydrocarbon cleaning agent; C. Place the workpiece cleaned in step B into a third cleaning tank and perform ultrasonic immersion cleaning for 6-14 minutes, wherein the cleaning liquid in the third cleaning tank is the hydrocarbon cleaning agent; D. Dry the workpiece cleaned in step C with hot air to complete the cleaning.

6. The method for using the hydrocarbon cleaning agent for carburizing steel according to claim 5, characterized in that: In step A, the temperature of the cleaning liquid in the first cleaning tank is 43°C to 47°C.

7. The method for using the hydrocarbon cleaning agent for carburizing steel according to claim 5, characterized in that: In step A, ultrasonic immersion cleaning is performed for 10 minutes.

8. The method for using the hydrocarbon cleaning agent for carburizing steel according to claim 5, characterized in that: In step B, ultrasonic immersion cleaning is performed for 10 minutes.

9. The method for using the hydrocarbon cleaning agent for carburizing steel according to claim 5, characterized in that: In step C, ultrasonic immersion cleaning is performed for 10 minutes.

10. The method for using the hydrocarbon cleaning agent for carburizing steel according to claim 5, characterized in that: In step D, the workpiece is dried with hot air under a negative pressure of 90 MPa, the hot air temperature is 80° C. to 140° C., and the drying time is 5 minutes.

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