A rust inhibitor and its preparation method and application

Abstract

The present invention provides a rust inhibitor and a preparation method and application thereof. In a first aspect, the present invention provides a rust inhibitor, which is obtained by neutralizing an acid mixture with an alkaline compound containing calcium ions, wherein: the acid mixture comprises a first acid compound and a second acid compound, the first acid compound is dinonylnaphthalenesulfonic acid, and the second acid compound is selected from one or two of monobasic fatty acids and polyisobutylene succinic anhydride. The rust inhibitor provided by the present invention does not include barium ions, is environmentally friendly, and has excellent rust resistance, water displacement, salt spray resistance and anti-stackability. It is an environmentally friendly multifunctional rust inhibitor that can be used for rust prevention of steel in high humidity, high heat and high salt environments, and is particularly suitable for sealing and rust prevention of workpieces that need to be stacked, such as steel coils and bearings.

Description

Technical Field

[0001] The invention relates to a rust inhibitor and a preparation method and application thereof, and relates to the technical field of oil-soluble rust inhibitors. Background Art

[0002] Using rust inhibitors to prevent metal from rusting is one of the most commonly used methods of metal protection. There are many types of rust inhibitors, mainly water-soluble rust inhibitors and oil-soluble rust inhibitors. Among them, oil-soluble rust inhibitors mainly prevent rust by mixing and adsorbing the rust inhibitor with the metal surface, changing the metal surface state. Commonly used oil-soluble rust inhibitors mainly include sulfonates, carboxylic acids and their derivatives, esters, organic phosphoric acids (salts), organic amines and heterocyclic compounds.

[0003] As a representative of sulfonate rust inhibitors, barium petroleum sulfonate is the earliest and most widely used rust inhibitor in China. It has good rust resistance, excellent water replacement, and especially outstanding resistance to salt water, and has excellent rust prevention effects on a variety of metals. With the increase in the use scenarios of rust inhibitors, multifunctional rust inhibitors are one of the future development trends. At present, there are protective products on the market that can adapt to metal products under various conditions, and also have the functions of lubrication, cleaning, vibration reduction, etc., and have been applied to internal combustion engines and military industries. Therefore, how to develop more multifunctional rust inhibitors is one of the hot topics that technicians in this field continue to study. Summary of the invention

[0004] The present invention provides a rust inhibitor which is not only environmentally friendly but also has excellent rust resistance, water displacement, salt spray resistance and anti-stacking ability. The rust inhibitor can be used for steel in high humidity, high heat and high salt environments, and is particularly suitable for sealing and rust prevention of workpieces that need to be stacked, such as steel coils and bearings.

[0005] The invention also provides a method for preparing the rust inhibitor, which has the advantages of simple process, mild reaction conditions, few side reactions and high yield.

[0006] The invention also provides an anti-rust oil, which comprises the above-mentioned anti-rust agent.

[0007] The first aspect of the present invention provides a rust inhibitor, which is obtained by neutralizing an acid mixture with an alkaline compound containing calcium ions, wherein:

[0008] The acid mixture comprises a first acidic compound and a second acidic compound, wherein the first acidic compound is dinonylnaphthalenesulfonic acid, and the second acidic compound is selected from one or two of monobasic fatty acids and polyisobutylene succinic anhydride, and the molar fraction of the dinonylnaphthalenesulfonic acid is 0.5-0.9, the molar fraction of the monobasic fatty acid is 0-0.5, and the molar fraction of the polyisobutylene succinic anhydride is 0-0.5.

[0009] In a specific embodiment, the monobasic fatty acid is selected from one or more of caprylic acid, capric acid, lauric acid, myristic acid, palmitic acid, stearic acid, and oleic acid.

[0010] In a specific embodiment, the polyisobutylene succinic anhydride is obtained by reacting high-activity polyisobutylene and maleic anhydride, and the molecular weight of the polyisobutylene succinic anhydride is 1000 or 1300.

[0011] In a specific embodiment, the alkaline compound containing calcium ions includes one or both of calcium hydroxide and calcium carbonate.

[0012] The second aspect of the present invention provides a method for preparing any of the above-mentioned rust inhibitors, the method comprising the following steps:

[0013] The first acidic compound and the second acidic compound are mixed to obtain an acidic mixture, and the acidic mixture is subjected to a neutralization reaction with an alkaline compound containing calcium ions to obtain the rust inhibitor.

[0014] In a specific embodiment, the first acidic compound and the second acidic compound are dissolved in a solvent to obtain the acidic mixture, and the solvent includes one or both of n-heptane and toluene.

[0015] In a specific embodiment, the neutralization reaction temperature is 65-75°C and the time is 1.5-3h.

[0016] In a specific embodiment, after the neutralization reaction is completed, base oil is added to the reaction product, and the solvent is removed to obtain the rust inhibitor.

[0017] In a specific embodiment, the base oil includes one or more of industrial white oil, mineral oil, and hydrogenated oil, and the kinematic viscosity of the base oil at 40° C. is 2-46 mm 2 / s.

[0018] The third aspect of the present invention provides an anti-rust oil, comprising any one of the above-mentioned anti-rust agents.

[0019] The implementation of the present invention has at least the following advantages:

[0020] 1. The rust inhibitor provided by the present invention is a composite acid calcium salt obtained by neutralizing a first acidic compound and a second acidic compound as raw materials with an alkaline compound containing calcium ions. The rust inhibitor does not include barium ions, is environmentally friendly, and has excellent rust resistance, water displacement, salt spray resistance and anti-stacking ability. It is an environmentally friendly multifunctional rust inhibitor that can be used for rust prevention of steel in high humidity, high heat and high salt environments, and is particularly suitable for sealing and rust prevention of workpieces that need to be stacked, such as steel coils and bearings.

[0021] 2. The preparation method of the rust inhibitor provided by the present invention has the advantages of simple process, mild reaction conditions, few side reactions and high yield. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in combination with 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.

[0023] The first aspect of the present invention provides a rust inhibitor, which is obtained by neutralizing an acid mixture with an alkaline compound containing calcium ions, wherein:

[0024] The acid mixture comprises a first acidic compound and a second acidic compound, wherein the first acidic compound is dinonylnaphthalenesulfonic acid, and the second acidic compound is selected from one or two of monobasic fatty acids and polyisobutylene succinic anhydride, and the molar fraction of the dinonylnaphthalenesulfonic acid is 0.5-0.9, the molar fraction of the monobasic fatty acid is 0-0.5, and the molar fraction of the polyisobutylene succinic anhydride is 0-0.5.

[0025] The present invention provides a rust preventive, which is a composite acid calcium salt generated by a neutralization reaction between an acid mixture and an alkaline compound containing calcium ions, wherein the acid mixture comprises a first acid compound and a second acid compound, the first acid compound is dinonylnaphthalenesulfonic acid, and the second acid compound is selected from one or two of monobasic fatty acid and polyisobutylene succinic anhydride, that is, the acid mixture includes not only dinonylnaphthalenesulfonic acid calcium, but also monobasic fatty acid and / or dinonylnaphthalenesulfonic acid, for example, the acid mixture includes dinonylnaphthalenesulfonic acid and polyisobutylene succinic anhydride, for another example, the acid mixture includes dinonylnaphthalenesulfonic acid and monobasic fatty acid, for another example, the acid mixture includes dinonylnaphthalenesulfonic acid, monobasic fatty acid and polyisobutylene succinic anhydride; the molar fraction of dinonylnaphthalenesulfonic acid is 0.5-0.9, and the molar fraction of dinonylnaphthalenesulfonic acid is 0.5-0.9. The mole fraction of the monobasic fatty acid is 0-0.5, and the mole fraction of the polyisobutylene succinic anhydride is 0-0.5. The mole fraction refers to the ratio of the amount of each component in the acid mixture to the total amount of the mixture. For example, when the acid mixture includes dinonylnaphthalenesulfonic acid and monobasic fatty acid, the total amount of dinonylnaphthalenesulfonic acid and monobasic fatty acid is 1, the amount of dinonylnaphthalenesulfonic acid is a, the amount of monobasic fatty acid is b, the mole fraction of dinonylnaphthalenesulfonic acid is x, x=a / 1=0.5-0.9, and the mole fraction of monobasic fatty acid is y, y=b / 1=0-0.5; after the above acidic compounds are mixed according to the above mole fractions to obtain an acidic mixture, a neutralization reaction is carried out with an alkaline compound containing calcium ions. After the reaction is completed, the rust inhibitor can be obtained, and its structural formula can be expressed as [(DNNSA) x (FA) y (PIBSA) z ]2·Ca, and x+y+z=1, x=0.5-0.9, y=0-0.5, z=0-0.5, the rust inhibitor provided by the present invention can be used alone, or it can be matched with other rust inhibitors to obtain rust-proof oil to reduce the cost of rust-proof oil. The specific selection can be made according to actual needs, and the present invention does not impose further restrictions on this. The rust inhibitor provided by the present invention is a composite acid calcium salt obtained by neutralizing a first acidic compound and a second acidic compound as raw materials with an alkaline compound containing calcium ions. The rust inhibitor does not include barium ions, is environmentally friendly, and has excellent rust resistance, water displacement, salt spray resistance and anti-stackability. It is an environmentally friendly multifunctional rust inhibitor that can be used for rust prevention of steel in high humidity, high heat and high salt environments, and is particularly suitable for sealing and rust prevention of workpieces that need to be stacked, such as steel coils and bearings.

[0026] In a specific embodiment, the monobasic fatty acid refers to a monobasic acid containing a fatty chain, and the monobasic fatty acid is specifically selected from one or more of caprylic acid, capric acid, lauric acid, myristic acid, palmitic acid, stearic acid, and oleic acid.

[0027] Polyisobutylene succinic anhydride is obtained by reacting high-activity polyisobutylene and maleic anhydride. High-activity polyisobutylene is a polyisobutylene with a majority content of terminal methyl vinylidene groups, specifically more than 60%. The conversion rate of high-activity polyisobutylene and the yield of polyisosuccinic anhydride are greatly improved by reacting high-activity polyisobutylene with maleic anhydride, and no chlorine is used, so that the environmental properties of the product are significantly improved.

[0028] Furthermore, the polyisobutylene succinic anhydride is a product available on the market, and its molecular weight is 1000 or 1300.

[0029] The alkaline compound containing calcium ions may specifically include one or both of calcium hydroxide and calcium carbonate. In order to ensure the conversion rate of the acidic mixture, the alkaline compound containing calcium ions may be slightly excessive in the acidic mixture to ensure that the acidic mixture reacts completely.

[0030] In summary, the rust inhibitor provided by the present invention is a composite acid calcium salt obtained by neutralizing a first acidic compound and a second acidic compound as raw materials with an alkaline compound containing calcium ions. The rust inhibitor does not include barium ions, is environmentally friendly, and has excellent rust resistance, water displacement, salt spray resistance and anti-stacking ability. It is an environmentally friendly multifunctional rust inhibitor that can be used for rust prevention of steel in high humidity, high heat and high salt environments, and is particularly suitable for sealing and rust prevention of workpieces that need to be stacked, such as steel coils and bearings.

[0031] The second aspect of the present invention provides a method for preparing any of the above-mentioned rust inhibitors, the method comprising the following steps:

[0032] The first acidic compound and the second acidic compound are mixed to obtain an acidic mixture, and the acidic mixture is subjected to a neutralization reaction with an alkaline compound containing calcium ions to obtain the rust inhibitor.

[0033] The present invention provides a method for preparing a corrosion inhibitor. First, a first acidic compound and a second acidic compound are mixed to obtain an acidic mixture. Then, the acidic mixture is subjected to a neutralization reaction with an alkaline compound containing calcium ions to obtain the rust inhibitor. The reaction process is described in detail below:

[0034] Step 1, mixing a first acidic compound and a second acidic compound to obtain an acidic mixture;

[0035] The mixing process can be carried out in a three-necked flask equipped with a reflux condenser, and the first acidic compound and the second acidic compound are added into the three-necked flask according to the molar fractions provided by the first aspect of the present invention to obtain an acidic mixture;

[0036] During the mixing process, an organic solvent having a mass equivalent to that of the acidic mixture may be added. The organic solvent may specifically be one or both of n-heptane and toluene. n-heptane and toluene have good solubility for reaction substrates and reaction products, which is beneficial to homogeneous reaction and subsequent removal of the solvent.

[0037] In addition, deionized water may be added to help dissolve alkaline compounds containing calcium ions, and the amount added may be determined according to actual production needs.

[0038] Step 2: neutralizing the acidic mixture with an alkaline compound containing calcium ions to obtain the rust inhibitor:

[0039] The acidic mixture obtained in step 1 is mixed with an alkaline compound containing calcium ions for neutralization reaction. In order to improve the conversion rate of the reaction, the temperature of the neutralization reaction is controlled to be 65-75° C., and then the alkaline compound containing calcium ions is slowly added to carry out the neutralization reaction. During the process, the addition rate of the alkaline compound containing calcium ions needs to be controlled so that the formed foam does not overflow the reflux pipe.

[0040] When the neutralization reaction reaches the end point, generally the reaction is carried out under reflux for about 1.5-3 hours. In order to further improve the reaction yield, the reaction time can be appropriately extended, for example, for 3 hours.

[0041] After the neutralization reaction is completed, a certain amount of base oil can be added to the reaction product to obtain a liquid rust inhibitor. At the same time, in order to avoid the influence of the solvent on the flash point and other properties of the rust inhibitor, the reaction system is slowly heated to 145-155°C to remove the solvent. After no solvent flows out, the pressure is reduced to 1-3kPa and distillation is continued. After the solution is no longer boiling and no solvent flows out, the distillation is stopped to obtain the rust inhibitor.

[0042] The base oil includes one or more of industrial white oil, mineral oil, and hydrogenated oil, and the kinematic viscosity of the base oil at 40°C is 2-46 mm 2 / s, and the amount added is equivalent to the total mass of the acid mixture.

[0043] The preparation method of the rust inhibitor provided by the invention has the advantages of simple process, mild reaction conditions, few side reactions and high yield.

[0044] The third aspect of the present invention provides an anti-rust oil, comprising any one of the above-mentioned anti-rust agents.

[0045] The present invention provides an anti-rust oil, which can be obtained by combining the anti-rust agent provided by the first aspect of the present invention with other anti-rust agents, and the combination can be selected according to actual needs.

[0046] The following is a detailed description in conjunction with specific embodiments, and the sources of the components used are as follows:

[0047] Dinonylnaphthalenesulfonic acid was prepared according to U.S. Pat. No. 2,764,548;

[0048] Monobasic fatty acids were purchased from Shanghai MacLean Biochemical Technology Co., Ltd.;

[0049] PIBSA was purchased from Xinxiang Ruifeng New Materials Co., Ltd.

[0050] Example 1

[0051] The rust inhibitor provided in this embodiment is obtained by neutralizing an acid mixture with calcium hydroxide, wherein the acid mixture includes dinonylnaphthalenesulfonic acid, n-decanoic acid and polyisobutylene succinic anhydride, and the molar fraction of dinonylnaphthalenesulfonic acid is 0.85, the molar fraction of n-decanoic acid is 0.1, and the molar fraction of polyisobutylene succinic anhydride is 0.05;

[0052] The molecular weight of the polyisobutylene succinic anhydride is 1000.

[0053] The preparation method of the rust inhibitor provided in this embodiment comprises the following steps:

[0054] Step 1, into a 500 ml three-necked flask equipped with a reflux condenser, 91.6 g of n-heptane and 4.2 g of deionized water were added, and then 78.2 g of dinonylnaphthalenesulfonic acid, 3.5 g of n-decanoic acid and 10.0 g of PIBSA were added in sequence to obtain an acidic mixture;

[0055] Step 2, turn on the magnetic stirring, heat the acidic mixture to 70±5°C, and then slowly add 7.4g of calcium hydroxide to neutralize the reaction. Pay attention to the speed of adding calcium hydroxide so that the foam formed does not overflow into the reflux pipe;

[0056] Step 3, react under reflux for about 3 hours, add 91.6g of Dalian 150SN base oil, slowly heat to 150±5°C to remove the solvent, and after no solvent flows out, reduce the pressure to 1-3kPa and continue distillation. After the solution does not boil and no solvent flows out, the rust inhibitor MACA-1 is obtained with a yield of 99.2%, which is a brown viscous liquid.

[0057] Example 2

[0058] The rust preventive provided in this embodiment is obtained by neutralizing an acid mixture with calcium carbonate, wherein the acid mixture includes dinonylnaphthalenesulfonic acid, palmitic acid and polyisobutylene succinic anhydride, and the molar fraction of dinonylnaphthalenesulfonic acid is 0.50, the molar fraction of palmitic acid is 0.20, and the molar fraction of polyisobutylene succinic anhydride is 0.30;

[0059] The molecular weight of the polyisobutylene succinic anhydride is 1,300.

[0060] The preparation method of the rust inhibitor provided in this embodiment comprises the following steps:

[0061] Step 1, into a 1000 ml three-necked flask equipped with a reflux condenser, 134.2 g of toluene and 4.5 g of deionized water were added, and then 46.0 g of dinonylnaphthalenesulfonic acid, 10.2 g of palmitic acid and 78.0 g of PIBSA were added in sequence to obtain an acidic mixture;

[0062] Step 2, turn on the magnetic stirring, heat the acid mixture to 70±5°C, and then slowly add 10.0g of calcium carbonate to carry out the neutralization reaction. Pay attention to the speed of adding calcium carbonate so that the foam formed does not overflow into the reflux pipe;

[0063] Step 3, react under reflux for about 3 hours, add 134.2g of light white oil W1-100, slowly heat to 150±5°C to remove the solvent, and after no solvent flows out, reduce the pressure to 1-3kPa and continue distillation. After the solution does not boil and no solvent flows out, the rust inhibitor MACA-2 is obtained with a yield of 98.9%, which is a brown viscous liquid.

[0064] Example 3

[0065] The rust inhibitor provided in this embodiment is obtained by neutralizing an acid mixture with calcium hydroxide, wherein the acid mixture includes dinonylnaphthalenesulfonic acid, lauric acid and polyisobutylene succinic anhydride, and the molar fraction of dinonylnaphthalenesulfonic acid is 0.75, the molar fraction of n-decanoic acid is 0.10, and the molar fraction of polyisobutylene succinic anhydride is 0.15;

[0066] The molecular weight of the polyisobutylene succinic anhydride is 1,300.

[0067] The preparation method of the rust inhibitor provided in this embodiment comprises the following steps:

[0068] Step 1, into a 500 ml three-necked flask equipped with a reflux condenser, 112 g of toluene and 4.1 g of deionized water were added, and then 69.0 g of dinonylnaphthalenesulfonic acid, 4.0 g of lauric acid and 39.0 g of PIBSA were added in sequence to obtain an acidic mixture;

[0069] Step 2, turn on the magnetic stirring, heat the acidic mixture to 70±5°C, and then slowly add 7.4g of calcium hydroxide to neutralize the reaction. Pay attention to the speed of adding calcium hydroxide so that the foam formed does not overflow into the reflux pipe;

[0070] Step 3, react under reflux for about 3 hours, add 112g of 75SN base oil, slowly heat to 150±5°C to remove solvent, and after no solvent flows out, reduce the pressure to 1-3kPa and continue distillation. After the solution does not boil and no solvent flows out, the rust inhibitor MACA-3 is obtained with a yield of 99.6%, which is a brown viscous liquid.

[0071] Example 4

[0072] The rust inhibitor provided in this embodiment is obtained by neutralizing an acid mixture with calcium carbonate. The acid mixture includes dinonylnaphthalenesulfonic acid and n-octanoic acid. The molar fraction of dinonylnaphthalenesulfonic acid is 0.50, and the molar fraction of n-octanoic acid is 0.50.

[0073] The preparation method of the rust inhibitor provided in this embodiment comprises the following steps:

[0074] Step 1, adding 60.4 g of n-heptane and 4.5 g of deionized water to a 250 ml three-necked flask equipped with a reflux condenser, and then adding 46.0 g of dinonylnaphthalenesulfonic acid and 14.4 g of n-octanoic acid in sequence to obtain an acidic mixture;

[0075] Step 2, turn on the magnetic stirring, heat the acid mixture to 70±5°C, and then slowly add 10.0g of calcium carbonate to neutralize the reaction. Pay attention to the speed of adding calcium carbonate so that the foam formed does not overflow into the reflux pipe;

[0076] Step 3, react under reflux for about 3 hours, then add 60.4g of Yubase4 base oil, slowly heat to 150±5°C to remove the solvent, and after no solvent flows out, reduce the pressure to 1-3kPa and continue distillation, and after the solution does not boil and no solvent flows out, obtain the rust inhibitor MACA-4, with a yield of 97.8%, which is a brown viscous liquid.

[0077] Example 5

[0078] The rust preventive provided in this embodiment is obtained by neutralizing an acid mixture with calcium hydroxide, wherein the acid mixture includes dinonylnaphthalenesulfonic acid, myristic acid and polyisobutylene succinic anhydride, and the molar fraction of dinonylnaphthalenesulfonic acid is 0.60, the molar fraction of myristic acid is 0.30, and the molar fraction of polyisobutylene succinic anhydride is 0.10;

[0079] The molecular weight of the polyisobutylene succinic anhydride is 1000.

[0080] The preparation method of the rust inhibitor provided in this embodiment comprises the following steps:

[0081] Step 1, into a 500 ml three-necked flask equipped with a reflux condenser, 89.0 g of n-heptane and 4.2 g of deionized water were added, and then 55.2 g of dinonylnaphthalenesulfonic acid, 13.7 g of myristic acid and 20.0 g of PIBSA were added in sequence to obtain an acidic mixture;

[0082] Step 2, turn on the magnetic stirring, heat the acidic mixture to 70±5°C, and then slowly add 7.4g of calcium hydroxide to neutralize the reaction. Pay attention to the speed of adding calcium hydroxide so that the foam formed does not overflow into the reflux pipe;

[0083] Step 3: react under reflux for about 3 hours, add 88.9 g of 150N base oil, slowly heat to 150±5°C to remove solvent, and after no solvent flows out, reduce the pressure to 1-3 kPa and continue distillation. After the solution does not boil and no solvent flows out, rust inhibitor MACA-5 is obtained with a yield of 99.5%, which is a brown viscous liquid.

[0084] Example 6

[0085] The rust inhibitor provided in this embodiment is obtained by neutralizing an acid mixture with calcium hydroxide. The acid mixture includes dinonylnaphthalenesulfonic acid and n-decanoic acid. The molar fraction of dinonylnaphthalenesulfonic acid is 0.90, and the molar fraction of n-decanoic acid is 0.10.

[0086] The preparation method of the rust inhibitor provided in this embodiment comprises the following steps:

[0087] Step 1, adding 86.2 g of n-heptane and 4.1 g of deionized water into a 500 ml three-necked flask equipped with a reflux condenser, and then adding 82.8 g of dinonylnaphthalenesulfonic acid and 3.5 g of n-decanoic acid in sequence to obtain an acidic mixture;

[0088] Step 2, turn on the magnetic stirring, heat the acidic mixture to 70±5°C, and then slowly add 7.4g of calcium hydroxide to neutralize the reaction. Pay attention to the speed of adding calcium hydroxide so that the foam formed does not overflow into the reflux pipe;

[0089] Step 3, react under reflux for about 3 hours, add 86.0g of Hengli No. 10 base oil, slowly heat to 150±5°C to remove the solvent, and after no solvent flows out, reduce the pressure to 1-3kPa and continue distillation. After the solution does not boil and no solvent flows out, the rust inhibitor MACA-6 is obtained with a yield of 97.6%, which is a brown viscous liquid.

[0090] Example 7

[0091] The rust inhibitor provided in this embodiment is obtained by neutralizing an acid mixture with calcium carbonate, wherein the acid mixture includes dinonylnaphthalenesulfonic acid, oleic acid and polyisobutylene succinic anhydride, and the molar fraction of dinonylnaphthalenesulfonic acid is 0.50, the molar fraction of oleic acid is 0.40, and the molar fraction of polyisobutylene succinic anhydride is 0.10;

[0092] The molecular weight of the polyisobutylene succinic anhydride is 1,300.

[0093] The preparation method of the rust inhibitor provided in this embodiment comprises the following steps:

[0094] Step 1, into a 500 ml three-necked flask equipped with a reflux condenser, 94.5 g of n-heptane and 4.5 g of deionized water were added, and then 46.0 g of dinonylnaphthalenesulfonic acid, 22.6 g of oleic acid and 26.0 g of PIBSA were added in sequence to obtain an acidic mixture;

[0095] Step 2, turn on the magnetic stirring, heat the acid mixture to 70±5°C, and then slowly add 10.1g of calcium carbonate to neutralize the reaction. Pay attention to the speed of adding calcium carbonate so that the foam formed does not overflow into the reflux pipe;

[0096] Step 3: react under reflux for about 3 hours, add 95.0 g of Yubase4 base oil, slowly heat to 150±5° C. to remove solvent, and after no solvent flows out, reduce the pressure to 1-3 kPa and continue distillation. After the solution does not boil and no solvent flows out, rust inhibitor MACA-7 is obtained with a yield of 98.7%, which is a brown viscous liquid.

[0097] Example 8

[0098] The rust inhibitor provided in this embodiment is obtained by neutralizing an acid mixture with calcium hydroxide, wherein the acid mixture includes dinonylnaphthalenesulfonic acid, n-decanoic acid, oleic acid and polyisobutylene succinic anhydride, and the molar fraction of dinonylnaphthalenesulfonic acid is 0.70, the molar fraction of n-decanoic acid is 0.10, the molar fraction of oleic acid is 0.10, and the molar fraction of polyisobutylene succinic anhydride is 0.10;

[0099] The molecular weight of the polyisobutylene succinic anhydride is 1000.

[0100] The preparation method of the rust inhibitor provided in this embodiment comprises the following steps:

[0101] Step 1, into a 500 ml three-necked flask equipped with a reflux condenser, 93.5 g of n-heptane and 4.1 g of deionized water were added, and then 65.0 g of dinonylnaphthalenesulfonic acid, 3.5 g of n-decanoic acid, 5.6 g of oleic acid and 20.0 g of PIBSA were added in sequence to obtain an acidic mixture;

[0102] Step 2, turn on the magnetic stirring, heat the acid mixture to 70±5°C, and then slowly add 7.5g of calcium hydroxide to neutralize the reaction. Pay attention to the speed of adding calcium hydroxide so that the foam formed does not overflow into the reflux pipe;

[0103] Step 3: react under reflux for about 3 hours, add 94.0 g of 150N base oil, slowly heat to 150±5°C to remove solvent, and after no solvent flows out, reduce the pressure to 1-3 kPa and continue distillation. After the solution does not boil and no solvent flows out, rust inhibitor MACA-8 is obtained with a yield of 98.5%, which is a brown viscous liquid.

[0104] Example 9

[0105] The rust inhibitor provided in this embodiment is obtained by neutralizing an acid mixture with calcium hydroxide, wherein the acid mixture includes dinonylnaphthalenesulfonic acid and polyisobutylene succinic anhydride, and the molar fraction of dinonylnaphthalenesulfonic acid is 0.50, and the molar fraction of polyisobutylene succinic anhydride is 0.50;

[0106] The molecular weight of the polyisobutylene succinic anhydride is 1,300.

[0107] The preparation method of the rust inhibitor provided in this embodiment comprises the following steps:

[0108] Preparation of environmentally friendly multifunctional rust inhibitor of calcium complex acid:

[0109] Step 1, into a 1000 ml three-necked flask equipped with a reflux condenser, 176 g of toluene and 4.1 g of deionized water were added, and then 46.2 g of dinonylnaphthalenesulfonic acid and 130.0 g of PIBSA were added in sequence to obtain an acidic mixture;

[0110] Step 2, turn on the magnetic stirring, heat the acidic mixture to 70±5°C, and then slowly add 7.4g of calcium hydroxide to neutralize the reaction. Pay attention to the speed of adding calcium hydroxide so that the foam formed does not overflow into the reflux pipe;

[0111] Step 3, react under reflux for about 3 hours, add 176g of light white oil W1-100, slowly heat to 150±5°C to remove the solvent, and after no solvent flows out, reduce the pressure to 1-3kPa and continue distillation. After the solution does not boil and no solvent flows out, the rust inhibitor MACA-9 is obtained with a yield of 99.2%, which is a brown viscous liquid.

[0112] Example 10

[0113] The rust inhibitor provided in this embodiment is obtained by neutralizing an acid mixture with calcium hydroxide, wherein the acid mixture includes dinonylnaphthalenesulfonic acid, stearic acid and polyisobutylene succinic anhydride, and the molar fraction of dinonylnaphthalenesulfonic acid is 0.85, the molar fraction of stearic acid is 0.10, and the molar fraction of polyisobutylene succinic anhydride is 0.05;

[0114] The molecular weight of the polyisobutylene succinic anhydride is 1000.

[0115] The preparation method of the rust inhibitor provided in this embodiment comprises the following steps:

[0116] Step 1, into a 500 ml three-necked flask equipped with a reflux condenser, 94.5 g of toluene and 4.5 g of deionized water were added, and then 78.0 g of dinonylnaphthalenesulfonic acid, 5.7 g of stearic acid and 10.0 g of PIBSA were added in sequence to obtain an acidic mixture;

[0117] Step 2, turn on the magnetic stirring, heat the acidic mixture to 70±5°C, and then slowly add 10.1g of calcium hydroxide to neutralize the reaction. Pay attention to the speed of adding calcium hydroxide so that the foam formed does not overflow into the reflux pipe;

[0118] Step 3, react under reflux for about 3 hours, add 94.0g of 75SN base oil, slowly heat to 150±5°C to remove solvent, and after no solvent flows out, reduce the pressure to 1-3kPa and continue distillation. After the solution does not boil and no solvent flows out, the rust inhibitor MACA-10 is obtained with a yield of 98.7%, which is a brown viscous liquid.

[0119] Comparative Example 1

[0120] The rust inhibitor provided in this comparative example is T705C.

[0121] Comparative Example 2

[0122] The rust inhibitor provided in this comparative example is rust inhibitor A provided by KING Company (the main component is a mixture of calcium dinonylnaphthalene sulfonate and fatty acid calcium)

[0123] The rust inhibitors provided in Examples 1-10 and Comparative Examples 1-2 were subjected to performance tests. The test methods are as follows. The test results are shown in Table 1:

[0124] The damp heat test adopts GB / T 2361 method;

[0125] The salt spray test adopts SH / T 0081 method;

[0126] Stacking test: add 12 drops of deionized water to the test piece coated with anti-rust oil, stack them two by two, place a 1000g weight on the top of the stack, place it in a 77℃ oven, observe the board surface every day, add 12 drops of water after observation, and record the board surface appearance and time;

[0127] Water displacement: Add 2g of deionized water to the steel wool strip, place it in a 100ml concentration bottle, then add the sample, start timing, and observe the volume of water displaced at 3 minutes and 10 minutes respectively.

[0128] Table 1 Performance test results of rust inhibitors provided by Examples 1-10 and Comparative Examples 1-2

[0129]

[0130] Note: The test results may vary due to different test pieces, base oils, test equipment and other conditions.

[0131] According to the data provided in Table 1, the rust inhibitor provided by the present invention does not include barium ions, is environmentally friendly, has excellent rust resistance, water displacement, salt spray resistance and anti-stacking ability, and is an environmentally friendly multifunctional rust inhibitor. It can be used for rust prevention of steel in high humidity, high heat and high salt environments, and is particularly suitable for sealing and rust prevention of workpieces that need to be stacked, such as steel coils and bearings.

[0132] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A rust inhibitor, characterized in that: The rust inhibitor is obtained by neutralizing an acidic mixture with an alkaline compound containing calcium ions, wherein: The acid mixture comprises a first acidic compound and a second acidic compound, the first acidic compound is dinonylnaphthalene sulfonic acid, the second acidic compound is selected from one or two of monobasic fatty acids and polyisobutylene succinic anhydride, the second acidic compound at least comprises polyisobutylene succinic anhydride, and the molar fraction of the dinonylnaphthalene sulfonic acid is 0.5-0.9, the molar fraction of the monobasic fatty acid is greater than 0 and less than or equal to 0.5, and the molar fraction of the polyisobutylene succinic anhydride is greater than 0 and less than or equal to 0.5; The polyisobutylene succinic anhydride is obtained by reacting high-activity polyisobutylene and maleic anhydride, and the molecular weight of the polyisobutylene succinic anhydride is 1000 or 1300; The monobasic fatty acid is selected from one or more of caprylic acid, capric acid, lauric acid, myristic acid, palmitic acid, stearic acid and oleic acid.

2. The rust inhibitor according to claim 1, characterized in that The alkaline compound containing calcium ions includes one or both of calcium hydroxide and calcium carbonate.

3. A method for preparing the rust inhibitor according to claim 1 or 2, characterized in that: The method comprises the following steps: The first acidic compound and the second acidic compound are mixed to obtain an acidic mixture, and the acidic mixture is subjected to a neutralization reaction with an alkaline compound containing calcium ions to obtain the rust inhibitor.

4. The preparation method according to claim 3, characterized in that: The first acidic compound and the second acidic compound are dissolved in a solvent to obtain the acidic mixture, and the solvent includes one or both of n-heptane and toluene.

5. The preparation method according to claim 3 or 4, characterized in that: The temperature of the neutralization reaction is 65-75° C. and the time is 1.5-3 h.

6. The preparation method according to claim 4, characterized in that: After the neutralization reaction is completed, base oil is added to the reaction product, and the solvent is removed to obtain the rust inhibitor.

7. The preparation method according to claim 6, characterized in that: The base oil includes one or more of industrial white oil, mineral oil, and hydrogenated oil, and the kinematic viscosity of the base oil at 40° C. is 2-46 mm 2 / s.

8. A rust-proof oil, characterized in that: The anti-rust oil comprises the anti-rust agent according to claim 1 or 2.

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