An anti-rust treatment agent for the surface of a compressor liquid storage tank and its preparation method

Abstract

The present invention relates to the technical field of surface anti-rust treatment, and particularly relates to an anti-rust treatment agent for the surface of a compressor liquid storage tank and a preparation method thereof. The raw materials of the anti-rust treatment agent for the surface of the compressor liquid storage tank include, by mass: 0.1-1 part of an alkaline corrosion inhibitor, 0.1-1 part of glycerol, 1-5 parts of isomeric alcohol carboxylate, 1-3 parts of inorganic base, 1-3 parts of terminal amino polyamide-amine, 1-3 parts of dopamine, 5-10 parts of pretreated montmorillonite, 1-5 parts of saturated ammonia water, 5-15 parts of branched isomeric alcohol ether, 1-2 parts of isooctyl glucoside, 1-5 parts of penetrant, 1-5 parts of dispersant, 1-5 parts of chelating agent, and 60-100 parts of water. The present invention has no obvious visible corrosion on steel, and at the same time has a fast action speed, stable properties, no harmful effect on the human body, a simple preparation method, is suitable for large-scale popularization and application, and has high practical application value.

Description

Technical Field

[0001] The present invention relates to the technical field of surface rust prevention treatment, and particularly relates to a surface rust prevention treatment agent for a compressor liquid storage tank and a preparation method thereof. Background Art

[0002] As an important component in an air-conditioning system, the liquid storage tank is applicable to the suction end of a compressor. Its function is to suck the refrigerant that has undergone the air-conditioning refrigeration cycle, filter it, and then transport it to the compressor compression chamber for the next round of refrigeration cycle.

[0003] The workpiece processing surface of the liquid storage tank may rust, and it is necessary to perform rust prevention treatment on the workpiece surface. At the same time, the liquid storage tank is extremely easy to contact with oxygen, moisture or other corrosive media in the air, and it is very easy to generate electrochemical corrosion and rust on the mechanical metal surface over time, which may greatly affect the use performance of the equipment.

[0004] At present, the commonly used method is mainly to use an anti-rust agent to perform rust prevention treatment on the workpiece processing surface to protect the metal from rusting before use, and it can also play a certain protective role on the metal surface, prevent slight scratches, and has a good short-term rust prevention effect, but the general rust prevention time after treatment is not long.

[0005] Therefore, providing an anti-rust treatment agent for a liquid storage tank to effectively prevent surface rust, improve its service life, and increase its stability is an urgent problem to be solved. Summary of the Invention

[0006] The purpose of the present invention is to solve the disadvantages existing in the prior art, and to provide a surface rust prevention treatment agent for a compressor liquid storage tank and a preparation method thereof.

[0007] A surface rust prevention treatment agent for a compressor liquid storage tank, the raw materials of which include, by mass: 0.1 - 1 part of an alkaline corrosion inhibitor, 0.1 - 1 part of glycerol, 1 - 5 parts of isomeric alcohol carboxylate, 1 - 3 parts of inorganic base, 1 - 3 parts of terminal amino polyamide-amine, 1 - 3 parts of dopamine, 5 - 10 parts of pretreated montmorillonite, 1 - 5 parts of saturated ammonia water, 5 - 15 parts of branched-chain isomeric alcohol ether, 1 - 2 parts of isooctyl glucoside, 1 - 5 parts of penetrant, 1 - 5 parts of dispersant, 1 - 5 parts of chelating agent, and 60 - 100 parts of water.

[0008] Preferably, the inorganic base is at least one of sodium hydroxide, potassium hydroxide, barium hydroxide, calcium hydroxide, sodium carbonate, sodium bicarbonate, potassium carbonate, potassium bicarbonate.

[0009] Preferably, the alkaline corrosion inhibitor is compounded from a polymerized potassium inorganic compound, does not contain phosphorus and nitrogen elements, has high environmental protection requirements, and is miscible with most commonly used inorganic base salts without repulsion.

[0010] Preferably, the branched-chain isomeric alcohol ether is a fatty alcohol polyoxyethylene ether.

[0011] Preferably, the generation number of the amino-terminated polyamide-amine is 2.0 - 4.0 generations.

[0012] Preferably, the penetrant is at least one of JFC-M, JFC-S, and JFC-E.

[0013] Preferably, the dispersant is an organic acid salt dispersant or / and an alkylnaphthalenesulfonate. Preferably, the alkylnaphthalenesulfonate is sodium dodecylnaphthalenesulfonate (CAS: 40382 - 75 - 0), etc.

[0014] Preferably, the dispersant is composed of an octane isomeric carboxylate (i.e., sodium isooctanoate) and an alkylnaphthalenesulfonate.

[0015] Preferably, the chelating agent is at least one of polyepoxysuccinic acid sodium, tetrasodium glutamate diacetate, and trisodium methylglycine diacetate; preferably, it is a composition of polyepoxysuccinic acid sodium and trisodium methylglycine diacetate.

[0016] Preferably, the pretreated montmorillonite is prepared by the following steps: adding nano - montmorillonite and nano - molybdenum oxide into isopropanol, ultrasonic - treating for 2 - 4 h, adding saturated ammonia water, stirring at 80 - 90 °C for 1 - 2 h, filtering, washing, and vacuum - drying; adding it into water, adding zinc acetate thereto, stirring at 50 - 70 °C for 1 - 2 h, adding ammonia water with a mass fraction of 8 - 10% thereto under stirring, continuing to stir for 1 - 2 h, filtering, washing, calcining at 300 - 400 °C for 1 - 2 h, cooling to room temperature, and pulverizing.

[0017] In the present invention, the lamellar structure of nano - montmorillonite is exfoliated, and nano - molybdenum oxide is promoted to intercalate therein. Further, its lamellar structure is activated with amino groups, and nano - zinc oxide adheres and binds to the lamellar surface, with extremely high stability. Moreover, the molybdenum atoms thereon can stably bind to the surface of the liquid storage tank of the compressor highly efficiently, which can achieve the effect of rust removal and rust prevention while facilitating the further progress of subsequent processes.

[0018] More preferably, the particle size of the nano - molybdenum oxide is 50 - 200 nm.

[0019] More preferably, the mass ratio of nano - montmorillonite, nano - molybdenum oxide, and zinc acetate is 5 - 10:1 - 2:1 - 2.

[0020] The preparation method of the above - mentioned rust - proof treatment agent for the surface of the compressor liquid storage tank includes the following steps:

[0021] S1. Adding an inorganic base into water, stirring evenly at 20 - 30 °C, and sequentially adding an alkaline corrosion inhibitor, glycerol, and an isomeric alcohol carboxylate and stirring evenly to obtain a pre - formed material a ;

[0022] S2. Add branched isomeric alcohol ethers, isooctyl glucoside, penetrant, dispersant, chelating agent, and terminal amino polyamide-amine into water, and stir at 30 - 40 °C for 1 - 2 h to obtain a prefabricated material. b ;

[0023] S3. Add dopamine into water, add pretreated montmorillonite thereto, add saturated ammonia water, stir at 40 - 60 °C for 1 - 2 h, centrifuge, wash, and vacuum dry; add the prefabricated material a and the prefabricated material b and perform ultrasonic treatment for 10 - 30 min.

[0024] The using method of the above-mentioned rust preventive agent for the surface of the compressor liquid storage tank includes the following steps: Vertically spray the compressor liquid storage tank after leak detection with the above-mentioned rust preventive agent for the surface of the compressor liquid storage tank.

[0025] Beneficial effects:

[0026] In the present invention, a polydopamine layer is deposited on the pretreated montmorillonite, which not only improves the hydrophilicity of the montmorillonite, enhances the interfacial interaction between it and the substrate, has excellent dispersibility and interfacial compatibility, and further improves its rust prevention performance, but also the nano-molybdenum oxide and nano-zinc oxide combined on the surface of the pretreated montmorillonite, in cooperation with the deposited polydopamine on the surface, form a dense film on the workpiece surface. The rust prevention film is dense and compact, which can effectively block the entry of corrosive media such as moisture and air, greatly extends the rust prevention time, and has excellent stability.

[0027] In the present invention, polydopamine is combined on the surface of the pretreated montmorillonite. The surface of the pretreated montmorillonite has a large number of active amino groups, and it also cooperates with the terminal amino polyamide-amine. The affinity between the two is extremely high. It can not only effectively increase the stability of the system, but also significantly enhance the binding force of the rust preventive agent to the steel material, form a stable protective film on the substrate to prevent oxidation, prevent the workpiece surface from rusting, has excellent durability and adhesion performance, and the workpiece has strong rust removal and rust prevention capabilities, and greatly extends the rust prevention time.

[0028] The present invention has no obvious visible corrosion on the steel, and at the same time has a fast action speed, stable properties, no harmful effects on the human body, a simple preparation method, is suitable for large-scale popularization and application, and has high practical application value. Description of the drawings

[0029] Figure 1 It is the Tafel polarization curve after spraying the Q235 carbon steel plate with the rust preventive agents obtained in Example 5 and Comparative Examples 1 - 3.

[0030] Figure 2 It is the comparison chart of the corrosion potential and corrosion current density after spraying the Q235 carbon steel plate with the rust preventive agents obtained in Example 5 and Comparative Examples 1 - 3.

[0031] Figure 3 It is a corrosion rate comparison chart after spraying the rust preventive agent obtained from Example 5 and Comparative Examples 1-3 on the Q235 carbon steel plate. Specific Embodiments

[0032] The present invention will be further explained below in conjunction with specific embodiments.

[0033] Isoalkyl carboxylate is an alkyl carboxylic acid isomeric branched-chain alcohol amine soap organic compound, synthesized from polycarboxylic acid and isomeric organic amine, all purchased from a certain Xuxin New Materials (Guangzhou) Co., Ltd. The alkaline corrosion inhibitor is purchased from Guangdong Jiechem Co., Ltd., with the model of W-10A. The penetrant JFC-S is purchased from Nantong Runhua Chemical Co., Ltd., its type is non-ionic surfactant, and its chemical composition is polyoxyethylene ether compound.

[0034] Example 1

[0035] A rust preventive agent for the surface of a compressor liquid storage tank, the raw materials thereof include: 1 g of alkaline corrosion inhibitor, 1 g of glycerol, 10 g of isoalkyl carboxylate DX-S202, 10 g of potassium hydroxide, 10 g of 2.0-generation terminal amino polyamide-amine, 10 g of dopamine, 50 g of pretreated montmorillonite, 10 g of saturated ammonia water, 50 g of fatty alcohol polyoxyethylene ether, 10 g of isooctyl glucoside, 10 g of penetrant JFC-S, 10 g of dispersant, 10 g of chelating agent, and 600 g of water.

[0036] The dispersant is composed of sodium isooctanoate and alkylnaphthalenesulfonate in a mass ratio of 1:1. The chelating agent is composed of polyepoxysuccinic acid sodium and trisodium methylglycine diacetate in a mass ratio of 1:1.

[0037] The pretreated montmorillonite is prepared by the following steps: adding 50 g of nano-montmorillonite and 10 g of nano-molybdenum oxide with an average particle size of 80 nm to 200 g of isopropanol, ultrasonically treating for 2 h at a frequency of 5 kHz, adding 10 g of saturated ammonia water, stirring at 80 °C for 1 h, filtering, washing, and vacuum drying; adding to 1000 g of water, adding 10 g of zinc acetate to it, stirring at 50 °C for 1 h, adding 10 g of ammonia water with a mass fraction of 8% to it under stirring, continuing to stir for 1 h, filtering, washing, roasting at 300 °C for 1 h, cooling to room temperature, and pulverizing.

[0038] The preparation method of the above-mentioned rust preventive agent for the surface of a compressor liquid storage tank includes the following steps:

[0039] S1. Add potassium hydroxide to 200 g of water, stir evenly at 20 °C, and sequentially add the alkaline corrosion inhibitor, glycerol, and isoalkyl carboxylate DX-S202 and stir evenly to obtain a prefabricated material a ;

[0040] S2. Add fatty alcohol polyoxyethylene ether, isooctyl glucoside, penetrant JFC-S, dispersant, chelating agent, and terminal amino polyamide-amine to 400 g of water, and stir at 30 °C for 1 h to obtain a prefabricated material. b ;

[0041] S3. Add dopamine to 200 g of water, add pretreated montmorillonite thereto, add saturated ammonia water, stir at 40 °C for 1 h, centrifuge, wash with ethanol, and dry in vacuum; add the prefabricated material a and the prefabricated material b and perform ultrasonic treatment for 10 min at an ultrasonic frequency of 4 kHz.

[0042] Example 2

[0043] An anti-rust treatment agent for the surface of a compressor liquid storage tank, the raw materials of which include: 10 g of alkaline corrosion inhibitor, 10 g of glycerol, 50 g of isomeric alcohol carboxylate DX-S202, 30 g of potassium hydroxide, 30 g of 4.0-generation terminal amino polyamide-amine, 30 g of dopamine, 100 g of pretreated montmorillonite, 50 g of saturated ammonia water, 150 g of fatty alcohol polyoxyethylene ether, 20 g of isooctyl glucoside, 50 g of penetrant JFC-S, 50 g of dispersant, 50 g of chelating agent, and 1000 g of water.

[0044] The dispersant is composed of sodium isooctanoate and alkylnaphthalenesulfonate in a mass ratio of 1:1. The chelating agent is composed of polyepoxysuccinic acid sodium and trisodium methylglycine diacetate in a mass ratio of 3:1.

[0045] The pretreated montmorillonite is prepared by the following steps: Add 100 g of nano-montmorillonite and 20 g of nano-molybdenum oxide with an average particle size of 150 nm to 400 g of isopropanol, perform ultrasonic treatment at a frequency of 10 kHz for 4 h, add 100 g of saturated ammonia water, stir at 90 °C for 2 h, filter, wash, and dry in vacuum; add to 2000 g of water, add 20 g of zinc acetate thereto, stir at 70 °C for 2 h, add 50 g of 10% ammonia water thereto under stirring, continue stirring for 2 h, filter, wash, calcine at 400 °C for 2 h, cool to room temperature, and pulverize.

[0046] The preparation method of the above anti-rust treatment agent for the surface of a compressor liquid storage tank includes the following steps:

[0047] S1. Add potassium hydroxide to 500 g of water, stir evenly at 30 °C, and sequentially add the alkaline corrosion inhibitor, glycerol, and isomeric alcohol carboxylate DX-S202 and stir evenly to obtain a prefabricated material a ;

[0048] S2. Add fatty alcohol polyoxyethylene ether, isooctyl glucoside, penetrant JFC-S, dispersant, chelating agent, and terminal amino polyamide-amine to 500 g of water, and stir at 40 °C for 2 h to obtain a prefabricated material. b ;

[0049] S3. Add dopamine to 500 g of water, add pretreated montmorillonite thereto, add saturated ammonia water, stir at 60 °C for 2 h, centrifuge, wash with ethanol, and dry under vacuum; add the prefabricated material a and the prefabricated material b and perform ultrasonic treatment for 30 min at an ultrasonic frequency of 10 kHz.

[0050] Example 3

[0051] An anti-rust treatment agent for the surface of a compressor liquid storage tank, the raw materials of which include: 7 g of alkaline corrosion inhibitor, 2 g of glycerol, 40 g of isomeric alcohol carboxylate DX319, 15 g of potassium hydroxide, 15 g of 3.5-generation terminal amino polyamide-amine, 25 g of dopamine, 70 g of pretreated montmorillonite, 40 g of saturated ammonia water, 80 g of fatty alcohol polyoxyethylene ether, 17 g of isooctyl glucoside, 20 g of penetrant JFC-S, 40 g of dispersant, 20 g of chelating agent, and 720 g of water.

[0052] The dispersant is composed of sodium isooctanoate and alkyl naphthalene sulfonate in a mass ratio of 2:1. The chelating agent is composed of polyepoxysuccinic acid sodium and trisodium methylglycine diacetate in a mass ratio of 1:4.

[0053] The pretreated montmorillonite is prepared by the following steps: Add 90 g of nano-montmorillonite and 12 g of nano-molybdenum oxide with an average particle size of 100 nm to 350 g of isopropanol, perform ultrasonic treatment at a frequency of 6 kHz for 3.5 h, add 20 g of saturated ammonia water, stir at 88 °C for 80 min, filter, wash, and dry under vacuum; add to 1800 g of water, add 13 g of zinc acetate thereto, stir at 65 °C for 80 min, add 40 g of ammonia water with a mass fraction of 8.5% thereto under stirring, continue stirring for 100 min, filter, wash, calcine at 330 °C for 100 min, cool to room temperature, and pulverize.

[0054] The preparation method of the above anti-rust treatment agent for the surface of a compressor liquid storage tank includes the following steps:

[0055] S1. Add potassium hydroxide to 300 g of water, stir evenly at 28 °C, and sequentially add the alkaline corrosion inhibitor, glycerol, and isomeric alcohol carboxylate DX319 and stir evenly to obtain a prefabricated material a ;

[0056] S2. Add fatty alcohol polyoxyethylene ether, isooctyl glucoside, penetrant JFC-S, dispersant, chelating agent, and terminal amino polyamide-amine to 420 g of water, and stir at 37 °C for 80 min to obtain a prefabricated material. b ;

[0057] S3. Add dopamine to 400 g of water, add pretreated montmorillonite thereto, add saturated ammonia water, stir at 55 °C for 80 min, centrifuge, wash with ethanol, and dry under vacuum; add the prefabricated material a and the prefabricated material b and perform ultrasonic treatment for 25 min at an ultrasonic frequency of 6 kHz.

[0058] Example 4

[0059] An anti-rust treatment agent for the surface of a compressor liquid storage tank, the raw materials of which include: 3 g of alkaline corrosion inhibitor, 8 g of glycerol, 20 g of isomeric alcohol carboxylate DX319, 25 g of potassium hydroxide, 25 g of 2.5-generation terminal amino polyamide-amine, 15 g of dopamine, 90 g of pretreated montmorillonite, 20 g of saturated ammonia water, 120 g of fatty alcohol polyoxyethylene ether, 13 g of isooctyl glucoside, 40 g of penetrant JFC-S, 20 g of dispersant, 40 g of chelating agent, and 880 g of water.

[0060] The dispersant is composed of sodium isooctanoate and alkylnaphthalenesulfonate in a mass ratio of 1:3. The chelating agent is composed of polyepoxysuccinic acid sodium and trisodium methylglycine diacetate in a mass ratio of 2:1.

[0061] The pretreated montmorillonite is prepared by the following steps: Add 70 g of nano-montmorillonite and 18 g of nano-molybdenum oxide with an average particle size of 100 nm to 200 g of isopropanol, perform ultrasonic treatment at a frequency of 9 kHz for 2.5 h, add 80 g of saturated ammonia water, stir at 82 °C for 100 min, filter, wash, and dry under vacuum; add to 1200 g of water, add 17 g of zinc acetate thereto, stir at 55 °C for 100 min, add 20 g of ammonia water with a mass fraction of 9.5% thereto under stirring, continue stirring for 80 min, filter, wash, calcine at 370 °C for 80 min, cool to room temperature, and pulverize.

[0062] The preparation method of the above anti-rust treatment agent for the surface of a compressor liquid storage tank includes the following steps:

[0063] S1. Add potassium hydroxide to 400 g of water, stir evenly at 22 °C, and sequentially add the alkaline corrosion inhibitor, glycerol, and isomeric alcohol carboxylate DX319 and stir evenly to obtain a prefabricated material a ;

[0064] S2. Add fatty alcohol polyoxyethylene ether, isooctyl glucoside, penetrant JFC-S, dispersant, chelating agent, and terminal amino polyamide-amine to 480 g of water, and stir at 33 °C for 100 min to obtain a prefabricated material. b ;

[0065] S3. Add dopamine to 300 g of water, add pretreated montmorillonite thereto, add saturated ammonia water, stir at 45 °C for 100 min, centrifuge, wash with ethanol, and dry in vacuum; add the prefabricated material a and the prefabricated material b and perform ultrasonic treatment for 15 min at an ultrasonic frequency of 9 kHz.

[0066] Example 5

[0067] An anti-rust treatment agent for the surface of a compressor liquid storage tank, the raw materials of which include: 5 g of alkaline corrosion inhibitor, 5 g of glycerol, 30 g of isomeric alcohol carboxylate DX320, 20 g of potassium hydroxide, 20 g of 3.0-generation terminal amino polyamide-amine, 20 g of dopamine, 80 g of pretreated montmorillonite, 30 g of saturated ammonia water, 100 g of fatty alcohol polyoxyethylene ether, 15 g of isooctyl glucoside, 30 g of penetrant JFC-S, 30 g of dispersant, 30 g of chelating agent, and 800 g of water.

[0068] The dispersant is composed of sodium isooctanoate and alkylnaphthalenesulfonate in a mass ratio of 1:1. The chelating agent is composed of polyepoxysuccinic acid sodium and trisodium methylglycine diacetate in a mass ratio of 1:1.

[0069] The pretreated montmorillonite is prepared by the following steps: Add 80 g of nano-montmorillonite and 15 g of nano-molybdenum oxide with an average particle size of 100 nm to 300 g of isopropanol, perform ultrasonic treatment at a frequency of 7.5 kHz for 3 h, add 50 g of saturated ammonia water, stir at 85 °C for 90 min, filter, wash, and dry in vacuum; add to 1500 g of water, add 15 g of zinc acetate thereto, stir at 60 °C for 90 min, add 30 g of ammonia water with a mass fraction of 9% thereto under stirring, continue to stir for 90 min, filter, wash, calcine at 350 °C for 90 min, cool to room temperature, and pulverize.

[0070] The preparation method of the above anti-rust treatment agent for the surface of a compressor liquid storage tank includes the following steps:

[0071] S1. Add potassium hydroxide to 350 g of water, stir evenly at 25 °C, and sequentially add the alkaline corrosion inhibitor, glycerol, and isomeric alcohol carboxylate DX320 and stir evenly to obtain a prefabricated material a ;

[0072] S2. Add fatty alcohol polyoxyethylene ether, isooctyl glucoside, penetrant JFC-S, dispersant, chelating agent, and terminal amino polyamide-amine to 450 g of water, and stir at 35 °C for 90 min to obtain a prefabricated material. b ;

[0073] S3. Add dopamine to 350 g of water, add pretreated montmorillonite thereto, add saturated ammonia water, stir at 50 °C for 90 min, centrifuge, wash with ethanol, and dry in vacuum; add the prefabricated material a and the prefabricated material b and perform ultrasonic treatment for 20 min at an ultrasonic frequency of 7.5 kHz.

[0074] Comparative Example 1

[0075] An anti-rust treatment agent for the surface of a compressor liquid storage tank, the raw materials of which include: 5 g of alkaline corrosion inhibitor, 5 g of glycerol, 30 g of isomeric alcohol carboxylate DX320, 20 g of potassium hydroxide, 20 g of dopamine, 80 g of pretreated montmorillonite, 30 g of saturated ammonia water, 100 g of fatty alcohol polyoxyethylene ether, 15 g of isooctyl glucoside, 30 g of penetrant JFC-S, 30 g of dispersant, 30 g of chelating agent, and 820 g of water.

[0076] The dispersant is composed of sodium isooctanoate and alkylnaphthalene sulfonate in a mass ratio of 1:1. The chelating agent is composed of polyepoxysuccinic acid sodium and trisodium methylglycine diacetate in a mass ratio of 1:1.

[0077] The pretreated montmorillonite is prepared by the following steps: Add 80 g of nano-montmorillonite and 15 g of nano-molybdenum oxide with an average particle size of 100 nm to 300 g of isopropanol, perform ultrasonic treatment at a frequency of 7.5 kHz for 3 h, add 50 g of saturated ammonia water, stir at 85 °C for 90 min, filter, wash, and dry in vacuum; add to 1500 g of water, add 15 g of zinc acetate thereto, stir at 60 °C for 90 min, add 30 g of ammonia water with a mass fraction of 9% thereto under stirring, continue to stir for 90 min, filter, wash, calcine at 350 °C for 90 min, cool to room temperature, and pulverize.

[0078] The preparation method of the above anti-rust treatment agent for the surface of a compressor liquid storage tank includes the following steps:

[0079] S1. Add potassium hydroxide to 350 g of water, stir evenly at 25 °C, and sequentially add the alkaline corrosion inhibitor, glycerol, and isomeric alcohol carboxylate DX320 and stir evenly to obtain a prefabricated material a ;

[0080] S2. Add fatty alcohol polyoxyethylene ether, isooctyl glucoside, penetrant JFC-S, dispersant, and chelating agent to 470 g of water, and stir at 35 °C for 90 min to obtain a prefabricated materialb ;

[0081] S3. Add dopamine to 350 g of water, add pretreated montmorillonite thereto, add saturated ammonia water, stir at 50 °C for 90 min, centrifuge, wash with ethanol, and dry under vacuum; add the prefabricated material a and the prefabricated material b and perform ultrasonic treatment for 20 min at an ultrasonic frequency of 7.5 kHz.

[0082] Comparative Example 2

[0083] An anti-rust treatment agent for the surface of a compressor liquid storage tank, the raw materials thereof comprising: 5 g of an alkaline corrosion inhibitor, 5 g of glycerol, 30 g of isomeric alcohol carboxylate DX320, 20 g of potassium hydroxide, 20 g of 3.0-generation terminal amino polyamide-amine, 80 g of pretreated montmorillonite, 100 g of fatty alcohol polyoxyethylene ether, 15 g of isooctyl glucoside, 30 g of penetrant JFC-S, 30 g of a dispersant, 30 g of a chelating agent, and 850 g of water.

[0084] The dispersant is composed of sodium isooctanoate and alkyl naphthalene sulfonate in a mass ratio of 1:1. The chelating agent is composed of polyepoxysuccinic acid sodium and trisodium methylglycine diacetate in a mass ratio of 1:1.

[0085] The pretreated montmorillonite is prepared by the following steps: Add 80 g of nano-montmorillonite and 15 g of nano-molybdenum oxide with an average particle size of 100 nm to 300 g of isopropanol, perform ultrasonic treatment at a frequency of 7.5 kHz for 3 h, add 50 g of saturated ammonia water, stir at 85 °C for 90 min, filter, wash, and dry under vacuum; add to 1500 g of water, add 15 g of zinc acetate thereto, stir at 60 °C for 90 min, add 30 g of ammonia water with a mass fraction of 9% thereto under stirring, continue to stir for 90 min, filter, wash, calcine at 350 °C for 90 min, cool to room temperature, and pulverize.

[0086] The preparation method of the above anti-rust treatment agent for the surface of a compressor liquid storage tank comprises the following steps:

[0087] S1. Add potassium hydroxide to 350 g of water, stir evenly at 25 °C, and sequentially add the alkaline corrosion inhibitor, glycerol, and isomeric alcohol carboxylate DX320 and stir evenly to obtain the prefabricated material a ;

[0088] S2. Add fatty alcohol polyoxyethylene ether, isooctyl glucoside, penetrant JFC-S, dispersant, chelating agent, and terminal amino polyamide-amine to 500 g of water, stir at 35 °C for 90 min to obtain the prefabricated material b ;

[0089] S3. Add the prefabricated material aand prefabricated materials b Ultrasonic treatment for 20 min, with an ultrasonic frequency of 7.5 kHz.

[0090] Comparative Example 3

[0091] An anti-rust treatment agent for the surface of a compressor liquid storage tank, whose raw materials include: 5 g of alkaline corrosion inhibitor, 5 g of glycerol, 30 g of isomeric alcohol carboxylate DX320, 20 g of potassium hydroxide, 20 g of 3.0-generation terminal amino polyamide-amine, 20 g of dopamine, 80 g of pretreated montmorillonite, 30 g of saturated ammonia water, 100 g of fatty alcohol polyoxyethylene ether, 15 g of isooctyl glucoside, 30 g of penetrant JFC-S, 30 g of dispersant, 30 g of chelating agent, and 800 g of water.

[0092] The dispersant is composed of sodium isooctanoate and alkyl naphthalene sulfonate in a mass ratio of 1:1. The chelating agent is composed of polyepoxysuccinic acid sodium and trisodium methylglycine diacetate in a mass ratio of 1:1.

[0093] The pretreated montmorillonite is prepared by the following steps: Add 80 g of nano-montmorillonite and 15 g of nano-molybdenum oxide with an average particle size of 100 nm to 1500 g of water, add 15 g of zinc acetate thereto, stir at a temperature of 60 °C for 90 min, add 30 g of ammonia water with a mass fraction of 9% thereto under stirring, continue stirring for 90 min, filter, wash, calcine at a temperature of 350 °C for 90 min, cool to room temperature, and pulverize.

[0094] The preparation method of the above anti-rust treatment agent for the surface of a compressor liquid storage tank includes the following steps:

[0095] S1. Add potassium hydroxide to 350 g of water, stir evenly at a temperature of 25 °C, and successively add the alkaline corrosion inhibitor, glycerol, and isomeric alcohol carboxylate DX320 and stir evenly to obtain prefabricated materials a ;

[0096] S2. Add fatty alcohol polyoxyethylene ether, isooctyl glucoside, penetrant JFC-S, dispersant, chelating agent, and terminal amino polyamide-amine to 450 g of water, stir at a temperature of 35 °C for 90 min to obtain prefabricated materials b ;

[0097] S3. Add dopamine to 350 g of water, add the pretreated montmorillonite thereto, add saturated ammonia water, stir at a temperature of 50 °C for 90 min, centrifuge, wash with ethanol, and vacuum dry; add prefabricated materials a and prefabricated materials b Ultrasonic treatment for 20 min, with an ultrasonic frequency of 7.5 kHz.

[0098] Perform stability tests on the anti-rust treatment agents obtained in Example 5 and Comparative Examples 1-3, specifically as follows:

[0099] (1)High-temperature experiment: Place 50 mL of each group of rust preventive treatment agents in a graduated cylinder. After sealing, place it in a constant temperature water bath at 60 ± 2 °C to ensure that the water surface is above 2 / 3 of the graduated cylinder. After the experimental period (72 h) ends, take out the graduated cylinder, cool it to room temperature, and then check.

[0100] Each group of rust preventive treatment agents still remained in a uniform state, without any stratification or precipitation.

[0101] (2)Low-temperature experiment: Place 50 mL of each group of rust preventive treatment agents in a graduated cylinder. After sealing, place it in an environment at -5 ± 2 °C. After the experimental period (72 h) ends, take out the graduated cylinder, restore it to room temperature, and then check.

[0102] Each group of rust preventive treatment agents still remained in a uniform state, without any stratification or precipitation either.

[0103] Use Q235 carbon steel plates (specification: 80 mm × 40 mm × 3 mm), then remove the surface floating rust, remove the surface oil stain, polish with sandpaper, and obtain the sample steel after cleaning; spray the rust preventive treatment agents obtained in Example 5 and Comparative Examples 1-3 on the surface of the sample steel, let it dry naturally, and then seal it with a 1:1 mixture of paraffin and rosin, leaving only the working area (10 mm × 10 mm).

[0104] Use an electrochemical workstation to test the Tafel polarization curves of the sample steels after rust prevention treatment in each group. The corrosion medium is 3% sodium chloride aqueous solution, a platinum electrode is used as the auxiliary electrode, a saturated calomel electrode is used as the reference electrode, and the sample steels after rust prevention treatment in each group are used as the working electrodes.

[0105] The test parameters are as follows: the initial potential is -1.20 V, the termination potential is -0.00 V, the scanning speed is 0.005 V / s, the waiting time is 0 s, the current polarization method is reduction, and the frequency is 50 Hz.

[0106] The results are as Figure 1 and Figure 2 shown. The sample steel sprayed with the rust preventive treatment agent obtained in Example 5 has the largest corrosion-resistant potential and the smallest corrosion current density, which is better than those of Comparative Examples 1-3 (P < 0.05).

[0107] The corrosion rate of the sample steel after being treated with the rust preventive treatment agent can be calculated using the corrosion current density value obtained from the Tafel polarization curve. As Figure 3 shown, the sample steel sprayed with the rust preventive treatment agent obtained in Example 5 has the smallest corrosion rate, which is better than those of Comparative Examples 1-3 (P < 0.05).

[0108] The applicant believes that this is because: in the present invention, a polydopamine layer is deposited on the pretreated montmorillonite, which not only improves the hydrophilicity of the montmorillonite, enhances the interfacial interaction between it and the substrate, has excellent dispersibility and interfacial compatibility, and further improves its rust prevention performance, but also the nano-molybdenum oxide and nano-zinc oxide combined on the surface of the pretreated montmorillonite, in cooperation with the action of the polydopamine deposited on the surface, form a dense film on the workpiece surface. The rust prevention film is dense and compact, which can effectively block the entry of corrosive media such as moisture and air, greatly extends the rust prevention time, and has excellent stability. In the present invention, polydopamine is combined on the surface of the pretreated montmorillonite. The surface of the pretreated montmorillonite has a large number of active amino groups, which also cooperate with the terminal amino polyamidoamine. The affinity between the two is extremely high. It can not only effectively increase the stability of the system, but also significantly enhance the binding force of the rust prevention treatment agent to the steel material, and can form a stable protective film on the substrate to prevent oxidation, further preventing the processed surface of the workpiece from rusting, with excellent durability and adhesion performance. It not only makes the workpiece have strong rust removal and rust prevention ability, but also greatly extends the rust prevention time.

[0109] The above is only the preferred specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A rust-proof treatment agent for the surface of a compressor liquid storage tank, characterized in that: The raw materials include, by mass: 0.1-1 part of alkaline corrosion inhibitor, 0.1-1 part of glycerol, 1-5 parts of isomeric alcohol carboxylates, 1-3 parts of inorganic bases, 1-3 parts of amino-terminated polyamide-amines, 1-3 parts of dopamine, 5-10 parts of pretreated montmorillonite, 1-5 parts of saturated ammonia water, 5-15 parts of branched isomeric alcohol ethers, 1-2 parts of isooctyl glucoside, 1-5 parts of penetrants, 1-5 parts of dispersants, 1-5 parts of chelating agents, and 60-100 parts of water. The pretreated montmorillonite is prepared by the following steps: adding nano-montmorillonite and nano-molybdenum oxide to isopropanol for ultrasonic treatment for 2-4 hours, adding saturated ammonia water, stirring at 80-90°C for 1-2 hours, filtering, washing, and vacuum drying; adding to water, adding zinc acetate thereto, stirring at 50-70°C for 1-2 hours, adding ammonia water with a mass fraction of 8-10% thereto under stirring, continuing to stir for 1-2 hours, filtering, washing, roasting at 300-400°C for 1-2 hours, cooling to room temperature, and crushing.

2. The anti-rust treatment agent for the surface of the compressor liquid storage tank according to claim 1, characterized in that: The inorganic base is at least one of sodium hydroxide, potassium hydroxide, barium hydroxide, calcium hydroxide, sodium carbonate, sodium bicarbonate, potassium carbonate and potassium bicarbonate.

3. The anti-rust treatment agent for the surface of the compressor liquid storage tank according to claim 1, characterized in that: Branched isomeric alcohol ethers are fatty alcohol polyoxyethylene ethers.

4. The anti-rust treatment agent for the surface of the compressor liquid storage tank according to claim 1, characterized in that: The dispersant is an organic acid salt dispersant and / or an alkylnaphthalene sulfonate.

5. The anti-rust treatment agent for the surface of the compressor liquid storage tank according to claim 1, characterized in that: The chelating agent is at least one of sodium polyepoxysuccinate, tetrasodium glutamate diacetate, and trisodium methylglycine diacetate.

6. The anti-rust treatment agent for the surface of the compressor liquid storage tank according to claim 1, characterized in that: The mass ratio of nano-montmorillonite, nano-molybdenum oxide and zinc acetate is 5-10:1-2:1-2.

7. A method for preparing the anti-rust treatment agent for the surface of a compressor liquid storage tank according to any one of claims 1 to 6, characterized in that: The steps include: S1. Add inorganic alkali to water, stir evenly at 20-30°C, add alkaline corrosion inhibitor, glycerol, isomeric alcohol carboxylate and stir evenly to obtain prefabricated material. a ; S2. Add branched isomeric alcohol ether, isooctyl glucoside, penetrant, dispersant, chelating agent, and amino-terminated polyamide-amine to water, and stir at 30-40° C. for 1-2 hours to obtain a prefabricated material. b ; S3, add dopamine to water, add pretreated montmorillonite, add saturated ammonia water, stir at 40-60℃ for 1-2h, centrifuge, wash, and vacuum dry; add prefabricated material a and prefabricated materials b Ultrasonic treatment for 10-30 min.

8. A method for using the anti-rust treatment agent for the surface of a compressor liquid storage tank according to any one of claims 1 to 6, characterized in that: The method comprises the following steps: using the compressor liquid storage tank surface anti-rust treatment agent as described in any one of claims 1 to 6 to vertically spray the compressor liquid storage tank after the leak detection water inspection.

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