Environment-friendly dehydration anti-rust oil and preparation method thereof

Abstract

The invention discloses environment-friendly dehydration anti-rust oil and a preparation method thereof, and belongs to the technical field of dehydration anti-rust oil, and the key point of the technical scheme is that the dehydration anti-rust oil comprises the following raw materials in parts by weight: 70-85 parts of base oil, 8-16 parts of a corrosion inhibitor, 2-5 parts of a dehydrating agent, 0.2-0.7 part of an emulsifier, 1.5-2.5 parts of a film-forming agent and 1-3 parts of a dispersing agent; wherein the corrosion inhibitor comprises glutaraldehyde modified polyaspartic acid, sorbitan monooleate and petroleum calcium sulfonate in a weight ratio of 1: (0.3-0.6): (0.2-0.5), and good dehydration and rust prevention effects are achieved under the condition that a barium-containing corrosion inhibitor is not used.

Description

Technical Field

[0001] This invention relates to the field of dehydrating rust-preventive oil technology, and in particular to an environmentally friendly dehydrating rust-preventive oil and its preparation method. Background Technology

[0002] Dehydrating rust-preventive oil is formulated from dehydrating agents, corrosion inhibitors, and medium-light petroleum distillates. Its mechanism of action is as follows: the interfacial tension between the dehydrating agent and the metal surface is smaller than that between tap water or cleaning agent aqueous solution and the metal. Therefore, after the dehydrating rust-preventive oil comes into contact with the metal, it first breaks through the weak point of the water film on the metal surface and penetrates into the metal surface. Then, it spreads along the metal surface to the original metal-water interface, squeezing the water film and then curling it into water droplets, causing it to leave the metal surface and adhere to the oil film before falling off. The water that falls off sinks to the bottom of the dehydration tank and is discharged. The oil film that reaches the metal surface contains corrosion inhibitors, which are also surfactants of the base oil. The polar groups of the corrosion inhibitor molecules are adsorbed onto the metal interface and directionally adsorbed. The polar head is firmly adsorbed on the metal surface, while the non-polar tail forms a layer of monomolecular hydrophobic adsorption film arranged outwards, which has a strong encapsulation effect on polar molecules, thereby hindering the penetration of corrosive media and playing a role in corrosion inhibition.

[0003] Most corrosion inhibitors currently on the market use barium-containing inhibitors. Barium is a heavy metal that has an impact on the environment, soil, and human health. Developing barium-free rust inhibitors has become a research hotspot in this field. Summary of the Invention

[0004] To address the problem of existing corrosion inhibitors using barium-containing inhibitors, this invention provides an environmentally friendly dehydrating and rust-preventing oil and its preparation method, achieving excellent dehydration and rust prevention effects without using barium-containing corrosion inhibitors.

[0005] The first aspect of this invention is to provide an environmentally friendly dehydrating and rust-preventing oil using the following technical solution:

[0006] An environmentally friendly dehydrating rust-preventive oil, comprising the following raw materials in parts by weight: 70-85 parts base oil, 8-16 parts corrosion inhibitor, 2-5 parts dehydrating agent, 0.2-0.7 parts emulsifier, 1.5-2.5 parts film-forming agent, and 1-3 parts dispersant; wherein the corrosion inhibitor comprises glutaraldehyde-modified polyaspartic acid, sorbitan monooleate, and calcium petroleum sulfonate in a weight ratio of 1:(0.3-0.6):(0.2-0.5).

[0007] By adopting the above technical solution, when the corrosion inhibitor in this application is a mixture of glutaraldehyde-modified polyaspartic acid, sorbitan monooleate, and petroleum sulfonate, it has good solubility in base oil. Furthermore, the glutaraldehyde-modified polyaspartic acid, sorbitan monooleate, and petroleum sulfonate interlock to form a multi-layered molecular adsorption film, collectively blocking the gaps between them, making the adsorption film more complete and dense. This effectively improves the adsorption capacity of the corrosion inhibitor molecules on the metal surface, thus achieving good rust prevention performance. Moreover, when the corrosion inhibitor is a mixture of glutaraldehyde-modified polyaspartic acid, sorbitan monooleate, and petroleum sulfonate, its synergistic effect with the dehydrating agent is good, its water replacement capacity is stronger, and it can remove moisture from the metal surface more quickly, improving dehydration efficiency.

[0008] In addition, the rust-preventive oil in this application does not use barium-containing substances, making it more environmentally friendly during use and posing no harm to the human body.

[0009] Preferably, in the glutaraldehyde-modified polyaspartic acid, the weight ratio of glutaraldehyde to polyaspartic acid is 1:(1.5-2.5).

[0010] By adopting the above technical solution, when the weight ratio of glutaraldehyde to polyaspartic acid in glutaraldehyde-modified polyaspartic acid is within this range, the corrosion inhibition efficiency of glutaraldehyde-modified polyaspartic acid can reach the optimal level. This is because the groups or atoms in the polyaspartic acid and glutaraldehyde molecules play a role in promoting adsorption on the metal surface, forming a thicker and stronger adsorption protective layer that effectively covers the metal surface, thereby preventing hydrogen ions, sulfate ions and other ions from entering the metal surface and hindering the metal from being corroded.

[0011] Preferably, the modification method of glutaraldehyde-modified polyaspartic acid includes the following steps: mixing polyaspartic acid with water and stirring until dissolved, then adding glutaraldehyde aqueous solution and mixing evenly, and letting it stand for 12 hours without precipitation to obtain glutaraldehyde-modified polyaspartic acid.

[0012] Preferably, the dehydrating agent comprises polyacrylamide and fatty alcohol polyoxyethylene ether in a weight ratio of 1:(0.4-0.7).

[0013] By adopting the above technical solution, the dehydrating agent, which is a combination of polyacrylamide and fatty alcohol polyoxyethylene ether, can effectively improve the water replacement capacity of rust-preventive oil. Moreover, the good stability of polyacrylamide and fatty alcohol polyoxyethylene ether effectively ensures the long-lasting dehydration performance of rust-preventive oil.

[0014] Preferably, the polyacrylamide has a relative molecular weight of 6 million to 8 million.

[0015] By adopting the above technical solution, when the molecular weight of polyacrylamide is between 6 million and 8 million, it is beneficial for polyacrylamide to capture and bridge water molecules, thus making it easier to dehydrate. Furthermore, as the molecular weight of polyacrylamide increases, the molecular chain also becomes longer, which increases the probability of collision with water molecules, making it easier to dehydrate and effectively improving the water replacement efficiency of rust-preventive oil.

[0016] Preferably, the emulsifier is an alkyl glycoside.

[0017] By adopting the above technical solution, the use of alkyl glycosides as emulsifiers can effectively reduce the surface tension and interfacial tension of rust-preventive oil, improve the stability and emulsification performance of rust-preventive oil, reduce foaming, prevent sedimentation and stratification, and effectively improve the rust-preventive effect of rust-preventive oil.

[0018] Preferably, the dispersant is dioctyl phthalate.

[0019] By adopting the above technical solution, dioctyl phthalate can be used as a dispersant to effectively improve the dispersion performance and stability of dehydrating agents and corrosion inhibitors in base oil, thereby indirectly improving the dehydration and rust prevention performance of rust-preventive oil.

[0020] Preferably, the film-forming agent is modified polyethylene wax.

[0021] By adopting the above technical solution, when modified polyethylene wax is selected as the film-forming agent, its combined use with corrosion inhibitors can promote better spread of corrosion inhibitors on the metal surface and form a firm anti-rust oil film on the metal surface, which can effectively resist corrosion, rust prevention, moisture prevention, and salt spray prevention. In addition, the addition of modified polyethylene wax can also strengthen the oil film strength, thereby effectively preventing metal corrosion.

[0022] Preferably, the base oil comprises 150N base oil and D60 base oil in a weight ratio of 1:(0.7-1.1).

[0023] By adopting the above technical solution, the base oil acts as a carrier, ensuring the uniform dispersion of corrosion inhibitors, dehydrators, and emulsifiers. Simultaneously, the base oil participates in the formation of the anti-rust oil film and exhibits a significant oil effect. This oil effect refers to the physical adsorption of base oil on the metal surface in areas where corrosion inhibitor adsorption is low, penetrating between the directionally adsorbed corrosion inhibitor molecules. Through van der Waals forces, the base oil and corrosion inhibitor molecules jointly fill the pores, resulting in a more complete and dense anti-rust oil film. In this application, the anti-rust oil blended from two base oils of different viscosity grades, 150N and D60, achieves better anti-rust performance. This is likely because the hydrocarbon molecules of 150N and D60 base oils differ significantly in their chain structure and molecular weight, i.e., their molecular sizes are different. Therefore, the combined use of 150N and D60 base oils allows for the coverage or filling of pores of varying sizes formed during corrosion inhibitor film formation, resulting in higher anti-rust performance.

[0024] If the flash point of the base oil is too low, it will evaporate too quickly, which will cause the anti-rust oil film to spread unevenly on the metal surface. It will also cause the base oil in the oil tank to evaporate too quickly, requiring frequent replenishment and resulting in significant losses. Therefore, this application selects a combination of 150N base oil and D60 base oil, which can effectively ensure that the corrosion inhibitor forms a uniform film on the metal surface, and at the same time improve the dehydration effect of the dehydrating agent.

[0025] The second aspect of this application is to provide a method for preparing the above-mentioned environmentally friendly dehydrating rust-preventive oil, comprising the following preparation steps: heating and stirring the base oil at 40-50°C, then sequentially adding corrosion inhibitor, dehydrating agent, emulsifier, film-forming agent and dispersant, stirring at a constant temperature of 35-45°C for 1-2 hours, and then filtering to obtain the dehydrating rust-preventive oil.

[0026] In summary, the present invention has the following beneficial effects:

[0027] 1. The combined use of glutaraldehyde-modified polyaspartic acid, sorbitan monooleate, and calcium petroleum sulfonate exhibits good solubility in base oils. Furthermore, the interlocking of these components forms a multi-layered molecular adsorption film, effectively blocking gaps and creating a more complete and compact film. This significantly enhances the adsorption capacity of corrosion inhibitor molecules on metal surfaces, resulting in excellent rust prevention. Moreover, the combination of glutaraldehyde-modified polyaspartic acid, sorbitan monooleate, and calcium petroleum sulfonate as the corrosion inhibitor exhibits excellent synergy with dehydrating agents, resulting in stronger water displacement capabilities and faster removal of moisture from metal surfaces, thus improving dehydration efficiency.

[0028] 2. Limiting the molecular weight of polyacrylamide in the dehydrating agent helps improve the water replacement efficiency of the rust-preventive oil and thus improve the dehydration efficiency.

[0029] 3. The combination of two base oils with different flash points and viscosities in this application can not only improve the dispersion stability of corrosion inhibitors, dehydrators, and emulsifiers in the base oil, but also effectively improve the bonding force between the base oil and glutaraldehyde-modified polyaspartic acid, sorbitan monooleate, and petroleum sulfonate calcium, thereby effectively improving the rust-preventive oil film and the metal. Detailed Implementation

[0030] The present invention will be further described in detail below with reference to the embodiments.

[0031] All raw materials used in this application are commercially available.

[0032] Example 1

[0033] A method for preparing an environmentally friendly dehydrating rust-preventive oil includes the following preparation steps:

[0034] S1. Mix 70 kg of base oil at 40°C with heating and stirring until homogeneous. The base oil consists of 150N base oil and D60 base oil in a weight ratio of 1:0.7, i.e., 41.2 kg of 150N base oil and 28.8 kg of D60 base oil. The CAS number of the 150N base oil is 64742-52-5, the flash point is 242°C, and the kinematic viscosity (40°C) is 86 mmHg. 2 / s, D60 base oil flash point 68℃, kinematic viscosity (40℃) 1.308mm 2 / s;

[0035] S2. Add 8 kg of corrosion inhibitor, 2 kg of dehydrating agent, 0.2 kg of emulsifier (alkyl glycoside), 1.5 kg of film-forming agent (modified polyethylene wax) and 1 kg of dispersant (dioctyl phthalate) to the mixture obtained in step S1 in sequence, stir at a constant temperature of 35°C for 2 hours, and then filter to obtain the dehydrated rust-preventive oil.

[0036] The corrosion inhibitors include glutaraldehyde-modified polyaspartic acid, sorbitan monooleate, and calcium petroleum sulfonate in a weight ratio of 1:0.3:0.2, namely 5.3 kg of glutaraldehyde-modified polyaspartic acid, 1.6 kg of sorbitan monooleate, and 1.1 kg of calcium petroleum sulfonate.

[0037] Glutaraldehyde-modified polyaspartic acid is prepared using the following modification method: 5 kg of polyaspartic acid is mixed with 3 kg of water and stirred until dissolved. Then, an aqueous solution of glutaraldehyde (3.3 kg of glutaraldehyde dissolved in 2 kg of water) is added and mixed thoroughly. After standing for 12 hours without any precipitate, glutaraldehyde-modified polyaspartic acid is obtained, meaning the weight ratio of polyaspartic acid to glutaraldehyde is 1.5:1.

[0038] The dehydrating agent is composed of polyacrylamide and fatty alcohol polyoxyethylene ether in a weight ratio of 1:0.4. The amount of polyacrylamide is 1.43 kg with a relative molecular weight of 6 million, and the amount of fatty alcohol polyoxyethylene ether is 0.57 kg. The CAS number of fatty alcohol polyoxyethylene ether is 68131-39-5.

[0039] Example 2

[0040] A method for preparing an environmentally friendly dehydrating rust-preventive oil includes the following preparation steps:

[0041] S1. Mix 78 kg of base oil at 50°C with heating and stirring until homogeneous. The base oil consists of 150N base oil and D60 base oil in a weight ratio of 1:0.7, i.e., 45.9 kg of 150N base oil and 32.1 kg of D60 base oil. The CAS number of the 150N base oil is 64742-52-5, the flash point is 242°C, and the kinematic viscosity (40°C) is 86 mmHg. 2 / s, D60 base oil flash point 68℃, kinematic viscosity (40℃) 1.308mm 2 / s;

[0042] S2. Add 12 kg of corrosion inhibitor, 3.5 kg of dehydrating agent, 0.5 kg of emulsifier (alkyl glycoside), 2 kg of film-forming agent (modified polyethylene wax) and 2 kg of dispersant (dioctyl phthalate) to the mixture obtained in step S1 in sequence, stir at a constant temperature of 40°C for 1.5 h, and then filter to obtain the dehydrated rust-preventive oil.

[0043] The corrosion inhibitors include glutaraldehyde-modified polyaspartic acid, sorbitan monooleate, and calcium petroleum sulfonate in a weight ratio of 1:0.3:0.2, namely 8 kg of glutaraldehyde-modified polyaspartic acid, 2.4 kg of sorbitan monooleate, and 1.6 kg of calcium petroleum sulfonate.

[0044] The following modification method was used to modify polyaspartic acid with glutaraldehyde: 7 kg of polyaspartic acid was mixed with 4 kg of water and stirred until dissolved. Then, glutaraldehyde aqueous solution (4.7 kg of glutaraldehyde dissolved in 2.8 kg of water) was added and mixed evenly. After standing for 12 hours, no precipitate appeared, and glutaraldehyde-modified polyaspartic acid was obtained. That is, the weight ratio of polyaspartic acid to glutaraldehyde was 1.5:1.

[0045] The dehydrating agent is composed of polyacrylamide and fatty alcohol polyoxyethylene ether in a weight ratio of 1:0.4. The amount of polyacrylamide is 2.5 kg with a relative molecular weight of 6 million, and the amount of fatty alcohol polyoxyethylene ether is 1 kg. The CAS number of fatty alcohol polyoxyethylene ether is 68131-39-5.

[0046] Example 3

[0047] A method for preparing an environmentally friendly dehydrating rust-preventive oil includes the following preparation steps:

[0048] S1. Mix 85 kg of base oil at 50°C with heating and stirring until homogeneous. The base oil consists of 150N base oil and D60 base oil in a weight ratio of 1:0.7, i.e., 50 kg of 150N base oil and 35 kg of D60 base oil. The CAS number of the 150N base oil is 64742-52-5, the flash point is 242°C, and the kinematic viscosity (40°C) is 86 mmHg. 2 / s, D60 base oil flash point 68℃, kinematic viscosity (40℃) 1.308mm 2 / s;

[0049] S2. Add 16 kg of corrosion inhibitor, 5 kg of dehydrating agent, 0.7 kg of emulsifier (alkyl glycoside), 2.5 kg of film-forming agent (modified polyethylene wax) and 3 kg of dispersant (dioctyl phthalate) to the mixture obtained in step S1 in sequence. Stir at a constant temperature of 35-45℃ for 1-2 hours, and then filter to obtain the dehydrated rust-preventive oil.

[0050] The corrosion inhibitors include glutaraldehyde-modified polyaspartic acid, sorbitan monooleate, and calcium petroleum sulfonate in a weight ratio of 1:0.3:0.2, namely 10.7 kg of glutaraldehyde-modified polyaspartic acid, 3.2 kg of sorbitan monooleate, and 2.1 kg of calcium petroleum sulfonate.

[0051] The following modification method is used to modify glutaraldehyde-modified polyaspartic acid: 9 kg of polyaspartic acid is mixed with 5 kg of water and stirred until dissolved. Then, glutaraldehyde aqueous solution (6 kg of glutaraldehyde dissolved in 3.5 kg of water) is added and mixed evenly. After standing for 12 hours, no precipitate appears to obtain glutaraldehyde-modified polyaspartic acid, that is, the weight ratio of polyaspartic acid to glutaraldehyde is 1.5:1.

[0052] The dehydrating agent is composed of polyacrylamide and fatty alcohol polyoxyethylene ether in a weight ratio of 1:0.4. The amount of polyacrylamide is 3.6 kg with a relative molecular weight of 6 million, and the amount of fatty alcohol polyoxyethylene ether is 1.4 kg. The CAS number of fatty alcohol polyoxyethylene ether is 68131-39-5.

[0053] Example 4

[0054] A method for preparing an environmentally friendly dehydrating rust-preventive oil differs from Example 2 in that the content of each component in the corrosion inhibitor is different. Specifically, the total amount of corrosion inhibitor is 12 kg, which includes glutaraldehyde-modified polyaspartic acid, sorbitan monooleate, and calcium petroleum sulfonate in a weight ratio of 1:0.5:0.3, namely 6.7 kg of glutaraldehyde-modified polyaspartic acid, 3.3 kg of sorbitan monooleate, and 2 kg of calcium petroleum sulfonate. All other components are the same as in Example 2.

[0055] Example 5

[0056] A method for preparing an environmentally friendly dehydrating rust-preventive oil differs from Example 2 in that the content of each component in the corrosion inhibitor is different. Specifically, the total amount of corrosion inhibitor is 12 kg, which includes glutaraldehyde-modified polyaspartic acid, sorbitan monooleate, and calcium petroleum sulfonate in a weight ratio of 1:0.6:0.5, namely 5.7 kg of glutaraldehyde-modified polyaspartic acid, 3.4 kg of sorbitan monooleate, and 2.9 kg of calcium petroleum sulfonate. All other components are the same as in Example 2.

[0057] Example 6

[0058] The preparation method of an environmentally friendly dehydrating rust-preventive oil differs from that of Example 4 in that the weight ratio of polyaspartic acid to glutaraldehyde in the glutaraldehyde-modified polyaspartic acid is 2:1, that is, the amount of polyaspartic acid is 9.4 kg and the amount of glutaraldehyde is 4.7 kg. All other aspects are the same as in Example 4.

[0059] Example 7

[0060] The preparation method of an environmentally friendly dehydrating rust-preventive oil differs from that of Example 4 in that the weight ratio of polyaspartic acid to glutaraldehyde in the glutaraldehyde-modified polyaspartic acid is 2.5:1, that is, the amount of polyaspartic acid is 11.75 kg and the amount of glutaraldehyde is 4.7 kg. All other aspects are the same as in Example 4.

[0061] Example 8

[0062] A method for preparing an environmentally friendly dehydrating and rust-preventing oil differs from Example 6 in that the content of each component in the dehydrating agent is different. Specifically, the total amount of the dehydrating agent is 3.5 kg, which includes polyacrylamide and fatty alcohol polyoxyethylene ether in a weight ratio of 1:0.5. That is, the amount of polyacrylamide is 2.3 kg with a relative molecular weight of 6 million, and the amount of fatty alcohol polyoxyethylene ether is 1.2 kg. The others are the same as in Example 6.

[0063] Example 9

[0064] A method for preparing an environmentally friendly dehydrating and rust-preventing oil differs from Example 6 in that the content of each component in the dehydrating agent is different. Specifically, the total amount of the dehydrating agent is 3.5 kg, which includes polyacrylamide and fatty alcohol polyoxyethylene ether in a weight ratio of 1:0.7. That is, the amount of polyacrylamide is 2.1 kg with a relative molecular weight of 6 million, and the amount of fatty alcohol polyoxyethylene ether is 1.4 kg. The other components are the same as in Example 6.

[0065] Example 10

[0066] A method for preparing an environmentally friendly dehydrating rust-preventive oil differs from Example 4 in that the molecular weight of the polyacrylamide is 7 million, while all other parameters are the same as in Example 4.

[0067] Example 11

[0068] A method for preparing an environmentally friendly dehydrating rust-preventive oil differs from Example 4 in that the molecular weight of the polyacrylamide is 8 million, while all other parameters are the same as in Example 4.

[0069] Example 12

[0070] The preparation method of an environmentally friendly dehydrating rust-preventive oil differs from that of Example 4 in that the relative molecular weight of the polyacrylamide is 9 million, while all other parameters are the same as those in Example 4.

[0071] Example 13

[0072] The preparation method of an environmentally friendly dehydrating rust-preventive oil differs from that of Example 4 in that the relative molecular weight of the polyacrylamide is 5 million, while all other parameters are the same as those in Example 4.

[0073] Example 14

[0074] A method for preparing an environmentally friendly dehydrating rust-preventive oil differs from Example 4 in that only 150N base oil is used as the base oil, while the rest are the same as in Example 4.

[0075] Example 15

[0076] A method for preparing an environmentally friendly dehydrating rust-preventive oil differs from Example 4 in that only D60 base oil is used as the base oil, while all other components are the same as in Example 4.

[0077] Example 16

[0078] A method for preparing an environmentally friendly dehydrating rust-preventive oil differs from Example 4 in that an equal amount of kerosene is used instead of D60 base oil, i.e., the base oil consists of 150N base oil and kerosene, while all other aspects are the same as in Example 4.

[0079] Example 17

[0080] A method for preparing an environmentally friendly dehydrating rust-preventive oil differs from Example 4 in that an equal amount of 30# machine oil is used instead of 150N base oil, i.e., the base oil is composed of 30# machine oil and D60 base oil, while the rest is the same as in Example 4.

[0081] Example 18

[0082] A method for preparing an environmentally friendly dehydrating and rust-preventing oil differs from Example 4 in that the dehydrating agent used is only fatty alcohol polyoxyethylene ether, while the others are the same as in Example 4.

[0083] Example 19

[0084] A method for preparing an environmentally friendly dehydrating and rust-preventing oil differs from Example 4 in that the dehydrating agent used is only polyacrylamide with a relative molecular weight of 6 million, while the other components are the same as in Example 4.

[0085] Comparative Example 1

[0086] The preparation method of an environmentally friendly dehydrating rust-preventive oil differs from that of Example 4 in that only glutaraldehyde-modified polyaspartic acid is used as the corrosion inhibitor, while the rest are the same as in Example 4.

[0087] Comparative Example 2

[0088] A method for preparing an environmentally friendly dehydrating rust-preventive oil differs from Example 4 in that the corrosion inhibitor used is only sorbitan monooleate, while the others are the same as in Example 4.

[0089] Comparative Example 3

[0090] A method for preparing an environmentally friendly dehydrating rust-preventive oil differs from Example 4 in that the corrosion inhibitor is composed of sorbitan monooleate and calcium petroleum sulfonate, with the specific addition amounts being 7.5 kg of sorbitan monooleate and 4.5 kg of calcium petroleum sulfonate. All other aspects are the same as in Example 4.

[0091] Comparative Example 4

[0092] A method for preparing an environmentally friendly dehydrating rust-preventive oil differs from Example 4 in that the corrosion inhibitor is composed of glutaraldehyde-modified polyaspartic acid and sorbitan monooleate. Specifically, the amount added is 8 kg of glutaraldehyde-modified polyaspartic acid and 4 kg of sorbitan monooleate, while the rest are the same as in Example 4.

[0093] Comparative Example 5

[0094] A method for preparing an environmentally friendly dehydrating rust-preventive oil differs from Example 4 in that the polyaspartic acid used is unmodified polyaspartic acid, while all other aspects are the same as in Example 4.

[0095] Comparative Example 6

[0096] A method for preparing an environmentally friendly dehydrating rust-preventive oil differs from Example 4 in that an equal amount of dinonylnaphthalene sulfonate calcium is used instead of petroleum sulfonate calcium, while all other aspects are the same as in Example 4.

[0097] Performance testing

[0098] The dehydrated rust-preventive oils obtained in the above embodiments and comparative examples were subjected to the following performance tests, and the test results are shown in Table 1.

[0099] The oil-based stability of the rust-preventive oil was tested according to SH / T0214-1998 "Separation Stability Test Method for Rust-Preventive Greases";

[0100] The rust-preventive oil was subjected to a damp heat test according to GB / T2361-1992 "Rust-preventive Greases - Damp Heat Test Method". The test used 45# steel standard test pieces and lasted for 60 days. The rust condition of the test pieces was recorded according to SH / T0217-1998 "Rust-preventive Greases - Test Pieces - Rust Degree". The rust degrees were A (rust degree 0%), B (rust degree 1-10%), C (rust degree 11-25%), D (rust degree 26-50%), and E (rust degree 50-100%). In this application, the rust-preventive oil tested for grade A for all 60 days. Therefore, the number of days when the test pieces showed rust was further recorded. The longer the number of days when the test pieces showed rust, the better the rust-preventive performance of the rust-preventive oil on the metal.

[0101] According to SH / T0081-1991 "Salt Spray Test Method for Rust-Preventive Greases", the rust-preventive oil was subjected to a salt spray test. The test used 45# steel standard test pieces, and the test time was 48 hours. The rust condition of the test pieces was recorded according to SH / T0217-1998 "Rust Degree of Test Pieces for Rust-Preventive Greases". The rust degrees were A (rust degree 0%), B (rust degree 1-10%), C (rust degree 11-25%), D (rust degree 26-50%), and E (rust degree 50-100%). In this application, the rust-preventive oil achieved a grade A in the 48-hour test. Therefore, the number of days when the test pieces showed rust was further recorded. The longer the number of days when the test pieces showed rust, the better the rust-preventive performance of the rust-preventive oil on the metal.

[0102] According to Appendix A of SH / T0692-2000, "Rust-preventive Oils," a stacking test was conducted on the rust-preventive oil. The test used standard 45# steel test pieces and lasted for 7 days. The contact surfaces of the 45# steel test pieces were evaluated and recorded. The contact surface conditions were mainly categorized into four types: a) no change; b) easily removable marks or dirt; c) some non-removable marks or dirt; d) a large amount of non-removable marks or dirt. The better the steel contact surface condition, the better the interlayer corrosion resistance when workpieces are stacked. The results of the test in this application showed no change during the 7-day test. Further, the standard test pieces of 45# steel were stacked for 14 days. The rust condition of the test pieces was recorded according to SH / T0217-1998 "Rust-preventive grease test piece rust degree". The rust degree was A (rust degree 0%), B (rust degree 1-10%), C (rust degree 11-25%), D (rust degree 26-50%), and E (rust degree 50-100%).

[0103] According to SH / 0036-90, the water displacement test of the rust-preventive oil is performed. If no rust or stains are found on the No. 10 steel sheet after the test, it is considered qualified.

[0104] Table 1. Test Results of Dehydrated Rust-Preventive Oil

[0105]

[0106] As can be seen from the table above:

[0107] The dehydrating rust-preventive oils obtained in Examples 1-3 of this application have a damp heat resistance of ≥70 days and a salt spray resistance of ≥70 hours. Moreover, no rust was observed within 14 days in the stacking test, indicating that the dehydrating rust-preventive oils of this application not only have good dehydration performance but also good corrosion resistance, which can effectively protect metals.

[0108] Compared with Example 2, the dehydrated rust-preventive oils obtained in Examples 4-5 showed improved resistance to damp heat, salt spray, and dehydration properties as the content of sorbitan monooleate and calcium petroleum sulfonate in the corrosion inhibitor increased. However, as can be seen from Example 5, the various properties of Example 5 did not continue to improve compared with Example 4. Therefore, it can be seen that when the proportions of glutaraldehyde-modified polyaspartic acid, sorbitan monooleate, and calcium petroleum sulfonate are within the range specified in this application, the corrosion resistance and dehydration properties of the dehydrated rust-preventive oil can be effectively improved.

[0109] Compared with Example 4, in glutaraldehyde-modified polyaspartic acid, the resistance to damp heat and salt spray of the dehydrated rust-preventive oil in Examples 6-7 was improved with the increase of polyaspartic acid content. However, when the ratio of polyaspartic acid to glutaraldehyde reached 2.5:1, the resistance to damp heat and salt spray of the dehydrated rust-preventive oil no longer increased. It can be seen that when the ratio of polyaspartic acid to glutaraldehyde is 1.5-2.5:1, the anti-corrosion performance of the dehydrated rust-preventive oil can be effectively guaranteed.

[0110] Compared with Example 6, in Examples 8-9, with the total amount of dehydrating agent remaining unchanged, the anti-corrosion performance of the dehydrated rust-preventive oils obtained by increasing the content of fatty alcohol polyoxyethylene ether was higher than that of Example 6, and the dehydration performance was significantly improved compared with Example 6. However, when the ratio of polyacrylamide to fatty alcohol polyoxyethylene ether reached 1:0.7, the dehydration performance no longer increased. It can be seen that when the ratio of polyacrylamide to fatty alcohol polyoxyethylene ether is within the range defined in this application, not only can the damp heat resistance and salt spray resistance of the dehydrated rust-preventive oil be improved, but also the dehydration effect and dehydration rate of the dehydrated rust-preventive oil can be improved.

[0111] Compared with Example 4, in Examples 10-12, with the ratio of polyacrylamide to fatty alcohol polyoxyethylene ether remaining unchanged, the damp heat resistance, salt spray resistance, and dehydration performance of the dehydrating rust-preventive oil showed a trend of first increasing and then decreasing as the relative molecular weight of polyacrylamide increased. In particular, when the relative molecular mass of polyacrylamide reached 9 million, the time for the first drop of the dehydrating rust-preventive oil obtained in Example 12 was significantly longer than that in Examples 10-11, and the amount of dehydration was significantly lower than that in Examples 10-11. It can be seen that when the relative molecular mass of polyacrylamide exceeds 8 million, the dehydration performance of the dehydrating rust-preventive oil decreases.

[0112] Compared with Example 4, when the ratio of polyacrylamide to fatty alcohol polyoxyethylene ether remains unchanged, the dehydration performance of the dehydrated rust-preventive oil obtained in Example 13 is greatly reduced when the relative molecular weight of polyacrylamide is lower than the 6 million specified in this application. Furthermore, the salt spray resistance and damp heat resistance are also reduced compared with Example 4. This further illustrates that when the relative molecular weight of polyacrylamide is within the range specified in this application, the dehydration performance of the rust-preventive oil can be effectively improved.

[0113] Compared with Example 4, when only 150N base oil or D60 base oil is used as the base oil, the damp heat resistance, salt spray resistance, and laminated corrosion resistance of the dehydrated rust-preventive oil obtained in Examples 14-15 are significantly reduced compared with Example 4. Compared with Example 4, when the base oil is composed of 150N base oil and kerosene or 30# machine oil and D60 base oil, the damp heat resistance and salt spray resistance of the dehydrated rust-preventive oil obtained in Examples 16-17 are also worse than those of the dehydrated rust-preventive oil obtained in Example 4. It can be seen that when the base oil of this application is composed of 150N base oil and D60 base oil, the combination of the two can effectively ensure the effective spreading of the corrosion inhibitor on the metal surface and improve the corrosion resistance of the dehydrated rust-preventive oil.

[0114] Compared with Example 4, when only fatty alcohol polyoxyethylene ether or polyacrylamide with a relative molecular weight of 6 million is used as the dehydrating agent, the dehydration performance of the dehydrating rust-preventive oil obtained in Examples 18-19 is significantly reduced compared with that in Example 4. It can be seen that the combined use of fatty alcohol polyoxyethylene ether and polyacrylamide can effectively improve the dehydration performance of dehydrating rust-preventive oil.

[0115] Compared with Example 4, when the corrosion inhibitors used only glutaraldehyde-modified polyaspartic acid or sorbitan monooleate, the damp heat resistance, salt spray resistance, and rust resistance of the dehydrated rust-preventive oils obtained in Comparative Examples 1-2 were significantly reduced compared with Example 4, and the stability of the dehydrated rust-preventive oils was also reduced. Compared with Example 4, when the corrosion inhibitors in Comparative Examples 3-4 were composed of sorbitan monooleate and calcium petroleum sulfonate or glutaraldehyde-modified polyaspartic acid and sorbitan monooleate, the damp heat resistance, salt spray resistance, and rust resistance of the dehydrated rust-preventive oils obtained in Comparative Examples 3-4 were all reduced compared with Example 4. Therefore, it can be seen that when the corrosion inhibitors in this application are composed of glutaraldehyde-modified polyaspartic acid, sorbitan monooleate, and calcium petroleum sulfonate, the anti-corrosion performance of the dehydrated rust-preventive oil can be effectively improved, and the protective effect on metals can be enhanced.

[0116] Compared with Example 4, when unmodified polyaspartic acid was used or an equal amount of dinonylnaphthalene sulfonate calcium was used instead of petroleum sulfonate calcium, the damp heat resistance, salt spray resistance, and rust resistance of the dehydrated rust-preventive oil obtained in Comparative Example 5 were all reduced compared with Example 4. The damp heat resistance and salt spray resistance of the dehydrated rust-preventive oil obtained in Comparative Example 6 were also reduced compared with Example 4. This further illustrates that the combined use of the three corrosion inhibitors in this application can effectively improve the rust prevention effect of the dehydrated rust-preventive oil and enhance the protection effect on metals.

[0117] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. An environmentally friendly dehydrating rust-preventive oil, characterized in that the dehydrating rust-preventive oil comprises the following raw materials in parts by weight: 70-85 parts base oil, 8-16 parts corrosion inhibitor, 2-5 parts dehydrating agent, 0.2-0.7 parts emulsifier, 1.5-2.5 parts film-forming agent, and 1-3 parts dispersant; wherein the corrosion inhibitor comprises glutaraldehyde-modified polyaspartic acid, sorbitan monooleate, and calcium petroleum sulfonate in a weight ratio of 1:(0.3-0.6):(0.2-0.5).

2. The environmentally friendly dehydrating rust-preventive oil according to claim 1, characterized in that: In the glutaraldehyde-modified polyaspartic acid, the weight ratio of glutaraldehyde to polyaspartic acid is 1:(1.5-2.5).

3. The environmentally friendly dehydrating rust-preventive oil according to claim 2, characterized in that: The modification method of glutaraldehyde-modified polyaspartic acid includes the following steps: polyaspartic acid is mixed with water and stirred until dissolved, then glutaraldehyde aqueous solution is added and mixed evenly, and after standing for 12 hours without precipitation, glutaraldehyde-modified polyaspartic acid is obtained.

4. The environmentally friendly dehydrating rust-preventive oil according to claim 1, characterized in that: The dehydrating agent comprises polyacrylamide and fatty alcohol polyoxyethylene ether in a weight ratio of 1:(0.4-0.7).

5. The environmentally friendly dehydrating rust-preventive oil according to claim 3, characterized in that: The polyacrylamide has a relative molecular weight of 6 million to 8 million.

6. The environmentally friendly dehydrating rust-preventive oil according to claim 1, characterized in that: The emulsifier is an alkyl glycoside.

7. The environmentally friendly dehydrating rust-preventive oil according to claim 1, characterized in that: The dispersant used is dioctyl phthalate.

8. The environmentally friendly dehydrating rust-preventive oil according to claim 1, characterized in that: The film-forming agent is modified polyethylene wax.

9. The environmentally friendly dehydrating rust-preventive oil according to claim 1, characterized in that: The base oils include 150N base oil and D60 base oil in a weight ratio of 1:(0.7-1.1).

10. A method for preparing an environmentally friendly dehydrating rust-preventive oil as described in any one of claims 1-9, characterized in that: The preparation steps include the following: heating and stirring the base oil at 40-50℃, then adding corrosion inhibitor, dehydrating agent, emulsifier, film-forming agent and dispersant in sequence, stirring at a constant temperature of 35-45℃ for 1-2 hours, and then filtering to obtain the dehydrated rust-preventive oil.

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