A tempering solution based on organic electrolyte with imidazole ring

Abstract

The present invention discloses a tempering liquid based on an organic electrolyte with an imidazole ring, wherein the tempering liquid is prepared from the following components in parts by weight: 94 to 96 parts of an organic electrolyte with an imidazole ring, 2 to 5 parts of a cleaning dispersant, 1.5 to 2 parts of an antioxidant, and 0.3 to 0.5 parts of a metal deactivator. The tempering liquid of the present invention adopts an organic electrolyte with an imidazole ring, wherein the organic group in the organic electrolyte is a cyclic conjugated five-membered ring structure of imidazole, which increases the thermal stability of the structure, and at the same time, the long side chain in the structure (the group grafted by the side group of the imidazole ring) can increase the melting point of the structure, so that the tempering liquid of the present invention has a high melting point and decomposition temperature, and its decomposition temperature is as high as 400°C or more, and can be used stably at high temperatures; on the other hand, the long side chain in the structure can also increase its solubility with other additives, improve the stability of the system, and make the entire system still uniform and stable after one year of use, without floating, precipitation, and phase separation problems.

Description

Technical Field

[0001] The invention relates to a tempering liquid based on an organic electrolyte with an imidazole ring. Background Art

[0002] Tempering heat treatment is a metal heat treatment process that reheats the quenched workpiece to an appropriate temperature below the lower critical temperature Ac1, which is the starting temperature of the transformation of pearlite to austenite during heating, and cools it in air, water, oil or other media after keeping it warm for a period of time, or heats the quenched alloy workpiece to an appropriate temperature, keeps it warm for a certain period of time, and then cools it slowly or quickly. It is generally used to reduce or eliminate the internal stress in the quenched steel parts, or reduce its hardness and strength to improve its ductility or toughness. The workpiece should be tempered in time after quenching. Only through the combination of quenching and tempering can the required mechanical properties be obtained.

[0003] Tempering is usually carried out immediately after quenching. Its purpose is: (1) to eliminate the residual stress generated during quenching of the workpiece and prevent deformation and cracking; (2) to adjust the hardness, strength, plasticity and toughness of the workpiece to meet the performance requirements; (3) to stabilize the structure and size and ensure accuracy; (4) to improve and enhance the processing performance. Therefore, tempering is the last important process for the workpiece to obtain the required performance. Only through the combination of quenching and tempering can the workpiece obtain the required mechanical properties. The tempering process includes high-temperature tempering, medium-temperature tempering and low-temperature tempering. Under normal circumstances, the low-temperature tempering temperature is between 160℃ and 260℃, and tempering oil can be used as the medium for tempering heat treatment. Special tempering oil is usually based on deeply refined mineral oil as the base oil, and is compounded with various additives such as high-temperature antioxidants, detergents, dispersants, etc. At present, during the use of tempering oil, due to the need to be used at high temperatures for a long time, the mineral base oil with hydrocarbon as the main structure generally begins to decompose at 250℃ and generates a large amount of oil smoke. As the use time increases, the oil ages more and more, and the amount of oil smoke generated increases significantly, seriously affecting the health of on-site operators. Summary of the invention

[0004] Purpose of the invention: The purpose of the present invention is to provide a tempering solution based on an organic electrolyte with an imidazole ring which has a stable system and is heat-resistant.

[0005] Technical solution: The tempering liquid based on an organic electrolyte with an imidazole ring described in the present invention is prepared from the following components in parts by weight: 94 to 96 parts of an organic electrolyte with an imidazole ring, 2 to 5 parts of a cleaning dispersant, 1.5 to 2 parts of an antioxidant and 0.3 to 0.5 parts of a metal deactivator.

[0006] Wherein, the general structural formula of the organic electrolyte with an imidazole ring is:

[0007] In the formula, R is an alkyl group having 8 or more carbon atoms.

[0008] The cleaning dispersant includes one of monosuccinimide, bissuccinimide, polysuccinimide and high molecular weight succinimide in polyisobutylene succinimide or its derivatives. The cleaning dispersant can wash away the oil coke on the surface of the workpiece and dissolve it in the tempering liquid.

[0009] The antioxidant is one of hindered phenol antioxidants and aromatic amine antioxidants or a mixture of any two or more thereof. The antioxidant can capture the interference of oxygen free radicals on the liquid.

[0010] Wherein, the hindered phenol antioxidant is 2,6-di-tert-butyl-p-cresol.

[0011] Wherein, the aromatic amine antioxidant is one of phenylenediamine antioxidants, diphenyldiamine antioxidants or phenothiazine antioxidants.

[0012] Wherein, the metal deactivator is one of benzotriazoles or thiadiazoles or a mixture of any two or more thereof. The metal deactivator can form a passivation film on the surface of the workpiece that enters the tempering liquid at high temperature, thereby protecting the workpiece and preventing the workpiece from being oxidized. During the use of the tempering liquid, due to the presence of oxygen, the tempering liquid is oxidized by light and heat. In particular, when the tempering liquid is used to treat metal workpieces, metal ions such as iron and copper will be introduced. The metal ions will accelerate the oxidation of the tempering liquid. The metal deactivator can form a chelate with the metal ions and form a passivation film on the surface of the metal. It plays a role in delaying the oxidation of the tempering liquid catalyzed by metal ions and protecting the workpiece itself from oxidation.

[0013] Beneficial effects: The tempering liquid of the present invention adopts an organic electrolyte with an imidazole ring, and the organic group in the organic electrolyte is a cyclic conjugated five-membered ring structure of imidazole, which increases the thermal stability of the structure. At the same time, the long side chains in the structure (the groups grafted by the side groups of the imidazole ring) can increase the melting point of the structure, so that the tempering liquid of the present invention has a high melting point and decomposition temperature, and its decomposition temperature is as high as 400°C or above, and it can be stably used at high temperatures; on the other hand, the long side chains in the structure can also increase its solubility with other additives, improve the stability of the system, so that the entire system is still uniform and stable after one year of use, without floating, precipitation and phase separation problems, and the long side chains can also increase the viscosity of the tempering liquid, so that it can meet the application of tempering; the tempering liquid of the present invention can solve the problems of low decomposition temperature, easy volatility, large amount of oil smoke leading to environmental pollution, and easy aging affecting the tempering quality of workpieces of traditional mineral-based tempering oil. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 To show the appearance of the workpiece after tempering with mineral-based tempering oil for half a year;

[0015] Figure 2 This is the appearance of the workpiece after being tempered with the tempering fluid of the present invention after one year of use. DETAILED DESCRIPTION

[0016] The technical solution of the present invention is further described below in conjunction with specific embodiments.

[0017] Example 1

[0018] The tempering liquid based on the organic electrolyte with imidazole ring of the present invention is prepared by the following components in parts by weight: 95 parts [C 10 mim] BF4, 3 parts of polyisobutylene succinimide, 1.8 parts of N-phenyl-α-naphthylamine and 0.2 parts of a benzotriazole derivative.

[0019] The specific preparation method is: add the formula amount of [C 10 mim] BF4, polyisobutylene succinimide, N-phenyl-α-naphthylamine and benzotriazole derivatives are mixed to obtain a mixed material, and the mixed material is mixed uniformly at 70° C. to obtain a tempering liquid.

[0020] In Example 1, [C 10 mim]BF4 (1-decyl-3-methylimidazolium tetrafluoroborate) has the structural formula:

[0021]

[0022] Example 2

[0023] The tempering liquid based on the organic electrolyte with imidazole ring of the present invention is prepared by the following components in parts by weight: 80 parts [C 10 mim]BF4, 16 parts of [C8mim]BF4, 2 parts of polyisobutylene succinimide, 1.5 parts of 2,6-di-tert-butyl-p-cresol and 0.5 parts of a benzotriazole derivative.

[0024] The specific preparation method is: add the formula amount of [C 10 mim]BF4, [C8mim]BF4, polyisobutylene succinimide, 2,6-di-tert-butyl-p-cresol and a benzotriazole derivative are mixed to obtain a mixed material, and the mixed material is mixed uniformly at 70° C. to obtain a tempering solution.

[0025] Example 3

[0026] The tempering liquid based on the organic electrolyte with imidazole ring of the present invention is prepared by the following components in parts by weight: 94.7 parts [C 10 mim] BF4, 5 parts of polyisobutylene succinimide, 2 parts of 2,6-di-tert-butyl-p-cresol and 0.3 parts of a benzotriazole derivative.

[0027] The specific preparation method is: add the formula amount of [C 10 mim] BF4, polyisobutylene succinimide, 2,6-di-tert-butyl-p-cresol and a benzotriazole derivative are mixed to obtain a mixed material, and the mixed material is mixed uniformly at 70° C. to obtain a tempering liquid.

[0028] The tempering process is: heating the medium to a suitable insulation temperature (160°C to 260°C), fully immersing the workpiece to be treated in the treatment medium, and keeping it warm for a sufficient time (2 to 3 hours), then taking it out and cooling it to room temperature in the air. After one year of use, the physical and chemical properties and appearance of the tempering liquid obtained in Examples 1 to 3 and the mineral-based tempering oil after half a year of use are shown in Table 1.

[0029] Table 1

[0030]

[0031]

[0032] Table 1 and Figures 1-2 It can be seen that after using the mineral-based tempering oil for half a year, it will become sticky and black, indicating that it has completely aged and failed. At the same time, oil smoke can be seen with the naked eye during the tempering process, resulting in the surface of the tempered workpiece covered with oil coke. However, after using the tempering liquid of the present invention for one year, the system is still stable. At the same time, there is no volatility and oil smoke during the tempering process, so that the surface of the tempered workpiece is clean and smooth. In addition, through the viscosity ratio before and after use, it can be seen that the viscosity of the tempering liquid of the present invention has almost no change before and after use, indicating that the tempering liquid of the present invention using an organic electrolyte with an imidazole ring has system stability under a long-term high-temperature working environment.

Claims

1. A tempering solution based on an organic electrolyte with an imidazole ring, characterized in that: It is prepared by the following components in parts by weight: 95 parts [C 10 mim] BF4, 3 parts of polyisobutylene succinimide, 1.8 parts of N-phenyl-α-naphthylamine and 0.2 parts of a benzotriazole derivative; [C 10 mim]BF4 has the structural formula: ； The tempering process is: heat the medium to 160℃~260℃, fully immerse the workpiece to be treated in the treatment medium, and keep it warm for 2~3 hours, then take it out and cool it to room temperature in the air; after one year of use, the viscosity ratio of the tempering liquid is 1.01.

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