A bright quenching oil and a method for preparing the same

Abstract

The application belongs to the technical field of quenching oil, and specifically provides a bright quenching oil and a preparation method thereof, which comprises 150SN base oil, PHPB-based composite antioxidant, sodium pentadecyl sulfonate, fatty acid imidazoline, polydimethylsiloxane and benzotriazole. The bright quenching oil prepared by the application has excellent cooling effect and good use durability, can efficiently cool workpieces while guaranteeing the high brightness of the surface of the workpieces after quenching, and improves the antioxidant property and use durability of the quenching oil through optimization of the additives, thereby meeting the process requirements of precision mechanical part quenching.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of quenching oil, and particularly relates to a bright quenching oil and a preparation method thereof. BACKGROUND

[0002] Quenching oil is a cooling medium specially designed for metal heat treatment, and is mainly used for controlling the cooling speed of metal parts in the quenching process. Although the types and performances of quenching oils are constantly optimized and improved, with the rapid development of industrial technology, different application fields have put forward more stringent requirements for the performance of quenching oils.

[0003] The selection and application of quenching oil are crucial in the heat treatment process, and will directly affect the performance, hardness, wear resistance and other key indicators of metal materials. Compared with water-based quenching medium, the traditional quenching oil has the advantages of higher boiling point, strong compatibility, simple formula and the like, but gradually exposes technical shortcomings in the use process: the traditional quenching oil has more impurities, which is easy to penetrate into the metal surface to form stains, and is difficult to meet the smoothness requirements of high-end manufacturing, and part of the quenching oil contains amine antioxidants, which has poor biodegradability and is harmful to human health. Therefore, it is urgent to develop a bright quenching oil that takes into account excellent brightness and antioxidant properties.

[0004] A patent with the application publication number CN109957643A discloses a preparation method of an environmentally friendly rapid bright quenching oil. The rapid bright quenching oil prepared by the technology has a composite cooling agent, can form a stable homogeneous system with base oil, can quickly realize workpiece quenching, and reduce the problem of uneven hardness. However, the antioxidant used in the technology is an amine antioxidant, which has insufficient long-term stability and affects the health of the operator. In addition, a patent with the application publication number CN118996072A discloses a preparation method of an ultra-speed bright quenching oil. The technology constructs a partition cooling composite system, has excellent thermal response characteristics, can quickly reach the boiling state when contacting high-temperature workpieces, and reduces the time lag in the boiling stage, but the antioxidant system used is simply mixed, and has insufficient synergy and long-term effect. In addition, the procurement cost of the base oil is high, and the preparation process is complex, which is not conducive to actual mass production and use. SUMMARY

[0005] In view of the above problems, in order to further improve the brightness and antioxidant properties of the bright quenching oil, the application provides a bright quenching oil and a preparation method thereof.

[0006] The application first provides a bright quenching oil, which adopts the following technical scheme:

[0007] The bright quenching oil comprises the following components: 150SN base oil, PHPB-based composite antioxidant, sodium pentadecyl sulfonate, fatty acid imidazoline, polydimethylsiloxane and benzotriazole.

[0008] Further, the bright quenching oil comprises the following components by weight: 900-950 parts of 150SN base oil, 25-35 parts of PHPB-based composite antioxidant, 4-6 parts of sodium pentadecyl sulfonate, 15-25 parts of fatty acid imidazoline, 4.5-5.5 parts of polydimethylsiloxane and 4-6 parts of benzotriazole.

[0009] More preferably, the bright quenching oil comprises the following components by weight: 935 parts of 150SN base oil, 30 parts of PHPB-based composite antioxidant, 5 parts of sodium pentadecyl sulfonate, 20 parts of fatty acid imidazoline, 5 parts of polydimethylsiloxane and 5 parts of benzotriazole.

[0010] Further, the mass ratio of the PHPB-based composite antioxidant and the fatty acid imidazoline is (1-16):4.

[0011] Further, the preparation method of the PHPB-based composite antioxidant comprises the following steps:

[0012] PHPB is uniformly dispersed in toluene to obtain solution C; trimethylhexamethylene diisocyanate and dibutyltin dilaurate are uniformly dispersed in toluene to obtain solution D; solution C and solution D are uniformly mixed and reacted, then 3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionic acid, 3-mercapto-1,2-propanediol, tetraethyl hydroxyl adipoyl diamine and dibutyltin dilaurate are added and reacted, then the precipitate is collected after washing and vacuum drying to obtain the PHPB-based composite antioxidant.

[0013] Further, in the PHPB-based composite antioxidant, the mass ratio of trimethylhexamethylene diisocyanate and PHPB is (1-4):2.

[0014] Further, the mass ratio of 3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionic acid, 3-mercapto-1,2-propanediol and tetraethyl hydroxyl adipoyl diamine is (1.45-2.38):(0.65-1.07):1.

[0015] Further, the preparation method of the PHPB comprises the following steps:

[0016] Mercaptoethanol and azobisisobutyronitrile are uniformly dispersed in tetrahydrofuran to obtain solution A; hydroxyl-terminated polybutadiene is uniformly dispersed in tetrahydrofuran to obtain solution B; solution A and solution B are uniformly mixed and reacted after heating, then the precipitate is collected after washing and vacuum drying to obtain PHPB.

[0017] Further, the preparation method of the fatty acid imidazoline comprises the following steps:

[0018] After the lauric acid, hydroxyethyl ethylenediamine and toluene are uniformly mixed, the reaction is warmed, and after cooling, the precipitate is collected, washed, and vacuum dried to obtain the fatty acid imidazoline.

[0019] Further, the molar ratio of the lauric acid and the hydroxyethyl ethylenediamine is 6: (5-9).

[0020] The application also provides a preparation method of the bright quenching oil.

[0021] The 150SN base oil is warmed and stirred, the PHPB-based composite antioxidant, sodium pentadecyl sulfonate and the fatty acid imidazoline are added and stirred, then the polydimethylsiloxane and benzotriazole are added and continue to be stirred, and after the mixture is uniformly mixed, the temperature is lowered to room temperature, filtered, sealed, and allowed to stand to obtain the bright quenching oil.

[0022] Further, the sealed standing time is 12-48 hours.

[0023] Compared with the prior art, the application has the following beneficial effects:

[0024] 1. The PHPB-based composite antioxidant synthesized in the application uses PHPB as a skeleton, and through trimethylhexamethylene diisocyanate, 3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid (free radical inhibitor), 3-mercapto-1, 2-propanediol (peroxide decomposer) and tetrahydroxyhexanediamide (compatibility regulator) are precisely combined to form a multifunctional antioxidant system. The system not only solves the limitations of traditional single antioxidant single link, greatly improves the antioxidant performance of the system, but also improves the thermal stability of the antioxidant components by introducing the PHPB skeleton.

[0025] 2. The fatty acid imidazoline in the application can quickly form a dense protective film on the surface of a high-temperature workpiece, physically block the contact of oxygen and moisture with the workpiece, prevent the adhesion of oxidation products to the surface of the workpiece, and in addition, can displace the insoluble products already adhered to the surface of the workpiece, effectively ensuring the brightness of the surface of the quenched part. In the repeated high-temperature quenching process, the traditional fatty acid imidazoline is easily decomposed by heat, oxidized or destroyed by peroxide in the quenching oil, resulting in high loss rate and the need for frequent replenishment. The PHPB-based composite antioxidant can spontaneously enter the dense protective film through hydrogen bonding, enhancing the thermal stability of the fatty acid imidazoline, and also can greatly avoid the oxidative destruction of the fatty acid imidazoline by inhibiting the generation of peroxide, improving the durability of the fatty acid imidazoline.

[0026] 3. PHPB-based composite antioxidant molecules, through hydrogen bonding, accumulate at the workpiece-oil interface, where oxidation is most active, along with the brightener. This allows the PHPB-based composite antioxidant to preferentially capture free radicals at the interface and decompose peroxides, reducing the possibility of initiating oxidation chain reactions at the interface, fully exerting its antioxidant effect, and significantly improving the antioxidant performance of bright quenching oil. Detailed Implementation

[0027] The technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0029] When using “including,” “having,” and “contains” as described herein, the intention is to cover non-exclusive inclusion, unless an explicit qualifying term such as “only,” “consisting of,” etc., is used, in which case another component may be added.

[0030] The terms "preferred," "more preferably," "better," and "even better" used in this application refer to embodiments of this application that provide certain beneficial effects under certain circumstances. However, other embodiments may also be preferred under the same or other circumstances. Furthermore, the description of one or more preferred embodiments does not imply that other embodiments are unavailable, nor is it intended to exclude other embodiments from the scope of this application. That is, in this application, "preferred," "more preferably," "better," and "even better" are merely descriptions of implementations or embodiments with better effects, but do not constitute a limitation on the scope of protection of this application.

[0031] In this application, terms such as "further," "even more," and "particularly" are used for descriptive purposes and indicate differences in content, but should not be construed as limiting the scope of protection of this application.

[0032] In the present application, the meaning of "at least one" is one or more, such as one, two, and two or more. The meaning of "a plurality" or "several" is at least two, such as two, three, and the like. The meaning of "a plurality of" is at least two, such as two, three, and the like, unless otherwise specifically limited. In the description of the present application, the meaning of "several" is at least one, such as one, two, and the like, unless otherwise specifically limited.

[0033] When a numerical range is disclosed herein, the above range is considered continuous and includes the minimum and maximum values of the range, as well as every value between the minimum and maximum values. Further, when the range is for integers, every integer between the minimum and maximum values of the range is included. In addition, when multiple ranges are provided to describe a characteristic or a property, the ranges can be combined. In other words, unless otherwise indicated, all ranges disclosed herein should be interpreted to include any and all sub-ranges subsumed therein.

[0034] Unless otherwise specifically noted, all steps of the present application can be performed in sequence or randomly. For example, the method comprises steps (a) and (b), which means that the method can comprise steps (a) and (b) in sequence, or steps (b) and (a) in sequence. For example, the method can also comprise step (c), which means that step (c) can be added to the method in any order, for example, the method can comprise steps (a), (b) and (c), or steps (a), (c) and (b), or steps (c), (a) and (b), etc. Unless otherwise mentioned, the singular form of the term can include the plural form and cannot be understood as having a quantity of one.

[0035] In the present application, "above" or "below" includes the present number. For example, 1 below includes 1.

[0036] In the present application, room temperature refers to 0-40°C, including but not limited to 10-40°C, or further 20-30°C.

[0037] The present application is further illustrated by the following examples, but not limited in scope by the examples.

[0038] When the embodiments give numerical ranges, it is understood that unless the application specifically states to the contrary, the two endpoints and any number between the two endpoints of every numerical range is optional. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. Unless specific conditions are indicated in the embodiments, the procedures are carried out under conventional conditions or manufacturer's recommended conditions. Unless otherwise indicated, all reagents or apparatuses are commercially available and are of conventional design and manufacture. Any method, apparatus or material similar or equivalent to those described in the embodiments of the present application can be used in the practice of the present application, unless specifically stated to the contrary.

[0039] Embodiment 1

[0040] The bright quenching oil of the present embodiment is composed of 150SN base oil, PHPB-based composite antioxidant, sodium pentadecyl sulfonate, fatty acid imidazoline, polydimethylsiloxane and benzotriazole.

[0041] The preparation method of the PHPB-based composite antioxidant of the present embodiment comprises the following steps:

[0042] 2g of mercaptoethanol and 0.02g of azobisisobutyronitrile were uniformly dispersed in 10mL of tetrahydrofuran to obtain solution A;

[0043] 10g of hydroxyl-terminated polybutadiene was uniformly dispersed in 20mL of tetrahydrofuran to obtain solution B;

[0044] Solutions A and B were mixed and heated to 60℃ for 3 hours, then the solvent was removed by rotary evaporation, the collected precipitate was washed with tetrahydrofuran and methanol in sequence, and dried under vacuum at 60℃ to obtain PHPB;

[0045] 10g of PHPB was uniformly dispersed in 40mL of toluene to obtain solution C;

[0046] 15g of trimethylhexamethylene diisocyanate and 0.06g of dibutyltin dilaurate were uniformly dispersed in 40mL of toluene to obtain solution D;

[0047] Solutions C and D were uniformly mixed and reacted at 35℃ for 4.5 hours, then heated to 70℃, 6.9g of 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid, 1.9g of 3-mercapto-1,2-propanediol, 2.9g of tetraethyloxylhexanediamide and 0.2g of dibutyltin dilaurate were added, and after uniform mixing, reacted for another 8 hours, the solvent was removed by rotary evaporation, and the collected precipitate was washed with toluene and methanol, and dried under vacuum at 60℃ to obtain the PHPB-based composite antioxidant.

[0048] The preparation method of the fatty acid imidazoline of the present embodiment comprises the following steps:

[0049] Mix 10.0 g of lauric acid, 6.2 g of hydroxyethyl ethylenediamine and 50 mL of toluene uniformly, heat to 100°C for 6 hours, then heat to 180°C for 4 hours, cool to room temperature, then transfer to a separatory funnel, wash with 60°C deionized water, separate the organic phase after the layers are separated, wash with anhydrous ethanol, and dry at 60°C under vacuum to obtain the fatty acid imidazoline.

[0050] The preparation method of the bright quenching oil of the present embodiment comprises the following steps:

[0051] Weigh 935 g of 150SN base oil, heat to 60°C and stir for 30 minutes, then add 30 g of PHPB-based composite antioxidant, 5 g of sodium pentadecyl sulfonate and 20 g of fatty acid imidazoline, continue to stir for 1 hour, then add 5 g of polydimethylsiloxane and 5 g of benzotriazole, continue to stir for 2 hours, then stop heating, cool to room temperature, filter, and seal at room temperature for 24 hours to obtain the bright quenching oil.

[0052] Example 2

[0053] The bright quenching oil of the present embodiment is composed of 150SN base oil, PHPB-based composite antioxidant, sodium pentadecyl sulfonate, fatty acid imidazoline, polydimethylsiloxane and benzotriazole.

[0054] The preparation method of the PHPB-based composite antioxidant of the present embodiment comprises the following steps:

[0055] Disperse 2 g of mercaptoethanol and 0.02 g of azobisisobutyronitrile uniformly in 10 mL of tetrahydrofuran to obtain solution A;

[0056] Disperse 10 g of hydroxyl-terminated polybutadiene uniformly in 20 mL of tetrahydrofuran to obtain solution B;

[0057] Mix solution A and solution B and heat to 60°C for 3 hours, then remove the solvent by rotary evaporation, wash the collected precipitate with tetrahydrofuran and methanol in sequence, and dry at 60°C under vacuum to obtain PHPB.

[0058] Disperse 10 g of PHPB uniformly in 40 mL of toluene to obtain solution C;

[0059] Disperse 5 g of trimethylhexamethylene diisocyanate and 0.06 g of dibutyltin dilaurate uniformly in 40 mL of toluene to obtain solution D;

[0060] Mix solution C and solution D uniformly and react at 35°C for 4.5 hours, then increase the temperature to 70°C, add 5.6 g of 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid, 2.5 g of 3-mercapto-1,2-propanediol, 2.9 g of tetraethylenepentamine, and 0.2 g of dibutyltin dilaurate, mix uniformly and then react for 8 hours, remove the solvent by rotary evaporation, and wash the collected precipitate with toluene and methanol, and dry under vacuum at 60°C to obtain the PHPB-based composite antioxidant.

[0061] The method for preparing the fatty acid imidazoline of this example includes the following steps:

[0062] Mix 10.0 g of lauric acid, 4.3 g of hydroxyethyl ethylenediamine, and 50 mL of toluene uniformly, increase the temperature to 100°C and react for 6 hours, then increase the temperature to 180°C and continue to react for 4 hours, cool to room temperature, transfer to a separatory funnel, wash with 60°C deionized water, separate the organic phase, wash with anhydrous ethanol, and dry under vacuum at 60°C to obtain the fatty acid imidazoline.

[0063] The method for preparing the bright quenching oil of this example includes the following steps:

[0064] Weigh 935 g of 150SN base oil, increase the temperature to 60°C and stir for 30 minutes, then add 40 g of the PHPB-based composite antioxidant, 5 g of sodium pentadecyl sulfonate, and 10 g of the fatty acid imidazoline, continue to stir for 1 hour, then add 5 g of polydimethylsiloxane and 5 g of benzotriazole, continue to stir for 2 hours, stop heating, cool to room temperature, filter, and seal and stand at room temperature for 12 hours to obtain the bright quenching oil.

[0065] Example 3

[0066] The bright quenching oil of this example is composed of 150SN base oil, a PHPB-based composite antioxidant, sodium pentadecyl sulfonate, a fatty acid imidazoline, polydimethylsiloxane, and benzotriazole.

[0067] The method for preparing the PHPB-based composite antioxidant of this example includes the following steps:

[0068] Disperse 2 g of mercaptoethanol and 0.02 g of azobisisobutyronitrile uniformly in 10 mL of tetrahydrofuran to obtain solution A;

[0069] Disperse 10 g of hydroxyl-terminated polybutadiene uniformly in 20 mL of tetrahydrofuran to obtain solution B;

[0070] Mix solution A and solution B and increase the temperature to 60°C and react for 3 hours, then remove the solvent by rotary evaporation, wash the collected precipitate with tetrahydrofuran and methanol in sequence, and dry under vacuum at 60°C to obtain PHPB.

[0071] Take 10 g of PHPB evenly dispersed in 40 mL of toluene to obtain solution C;

[0072] Take 20 g of trimethyl hexamethylene diisocyanate, 0.06 g of dibutyl tin dilaurate evenly dispersed in 40 mL of toluene to obtain solution D;

[0073] Mix solution C and solution D evenly and react at 35 °C for 4.5 hours, then increase the temperature to 70 °C, add 4.2 g of 3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionic acid, 3.1 g of 3-mercapto-1,2-propanediol, 2.9 g of tetraethyloxylhexanediamide and 0.2 g of dibutyl tin dilaurate, mix evenly and react for another 8 hours, remove the solvent by rotary evaporation, wash the collected precipitate with toluene and methanol, and dry at 60 °C under vacuum to obtain the PHPB-based composite antioxidant.

[0074] The preparation method of the fatty acid imidazoline of this example includes the following steps:

[0075] Mix 10.0 g of lauric acid, 7.8 g of hydroxyethyl ethylenediamine and 50 mL of toluene evenly, increase the temperature to 100 °C and react for 6 hours, then increase the temperature to 180 °C and continue to react for 4 hours, cool to room temperature, transfer to a separatory funnel, wash with 60 °C deionized water, separate the organic phase and wash with anhydrous ethanol, and dry at 60 °C under vacuum to obtain the fatty acid imidazoline.

[0076] The preparation method of the bright quenching oil of this example includes the following steps:

[0077] Take 935 g of 150SN base oil, increase the temperature to 60 °C and stir for 30 minutes, then add 10 g of PHPB-based composite antioxidant, 5 g of sodium pentadecyl sulfonate and 40 g of fatty acid imidazoline, continue to stir for 1 hour, then add 5 g of polydimethylsiloxane and 5 g of benzotriazole, continue to stir for 2 hours, stop heating, cool to room temperature, filter, and seal and stand at room temperature for 48 hours to obtain the bright quenching oil.

[0078] Control group 1

[0079] The bright quenching oil of this control group is composed of 150SN base oil, sodium pentadecyl sulfonate, fatty acid imidazoline, polydimethylsiloxane and benzotriazole.

[0080] The preparation method of the fatty acid imidazoline of this control group includes the following steps:

[0081] Mix 10.0 g lauric acid, 6.2 g hydroxyethyl ethylenediamine and 50 mL toluene uniformly, heat to 100°C for 6 hours, then heat to 180°C for 4 hours, cool to room temperature, transfer to a separatory funnel, wash with 60°C deionized water, separate the organic phase, wash with anhydrous ethanol, and dry under vacuum at 60°C to obtain the fatty acid imidazoline.

[0082] The preparation method of the bright quenching oil of the control group comprises the following steps:

[0083] Weigh 935 g of 150SN base oil, heat to 60°C and stir for 30 minutes, then add 5 g of sodium pentadecyl sulfonate and 50 g of fatty acid imidazoline, continue to stir for 1 hour, then add 5 g of polydimethylsiloxane and 5 g of benzotriazole, continue to stir for 2 hours, then stop heating, cool to room temperature, filter, and seal at room temperature for 48 hours to obtain the bright quenching oil.

[0084] Control group 2

[0085] The bright quenching oil of the control group is composed of 150SN base oil, PHPB-based composite antioxidant, sodium pentadecyl sulfonate, polydimethylsiloxane and benzotriazole.

[0086] The preparation method of the PHPB-based composite antioxidant of the control group comprises the following steps:

[0087] Disperse 2 g of mercaptoethanol and 0.02 g of azobisisobutyronitrile uniformly in 10 mL of tetrahydrofuran to obtain solution A;

[0088] Disperse 10 g of hydroxyl-terminated polybutadiene uniformly in 20 mL of tetrahydrofuran to obtain solution B;

[0089] Mix solution A and solution B and heat to 60°C for 3 hours, then remove the solvent by rotary evaporation, wash the collected precipitate with tetrahydrofuran and methanol in turn, and dry under vacuum at 60°C to obtain PHPB;

[0090] Disperse 10 g of PHPB uniformly in 40 mL of toluene to obtain solution C;

[0091] Disperse 15 g of trimethylhexamethylene diisocyanate and 0.06 g of dibutyltin dilaurate uniformly in 40 mL of toluene to obtain solution D;

[0092] Solution C and solution D were mixed homogeneously and reacted at 35°C for 4.5 hours, then the temperature was raised to 70°C, 5.6 g of 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid, 3.5 g of 3-mercapto-1,2-propanediol, 6.4 g of tetraethylenepentamine and 0.2 g of dibutyltin dilaurate were added, after mixing homogeneously, the reaction was continued for 8 hours, the solvent was removed by rotary evaporation, and the precipitate was collected after washing with toluene and methanol, and dried at 60°C under vacuum to obtain the PHPB-based composite antioxidant.

[0093] The preparation method of the bright quenching oil of the control group comprises the following steps:

[0094] 935 g of 150SN base oil was weighed, heated to 60°C and stirred for 30 minutes, then 50 g of the PHPB-based composite antioxidant and 5 g of sodium pentadecyl sulfonate were added, and stirring was continued for 1 hour, then 5 g of polydimethylsiloxane and 5 g of benzotriazole were added, and stirring was continued for 2 hours, then heating was stopped, and the temperature was lowered to room temperature, filtered, and sealed and placed at room temperature for 24 hours to obtain the bright quenching oil.

[0095] Performance test

[0096] 1. The kinematic viscosity of the bright quenching oil prepared in Examples 1-3 and the control group 1-2 was tested according to GB / T265.

[0097] 2. The flash point of the bright quenching oil prepared in Examples 1-3 and the control group 1-2 was tested according to GB / T3536.

[0098] 3. The maximum cooling speed and characteristic temperature of the bright quenching oil prepared in Examples 1-3 and the control group 1-2 were tested according to ISO9950.

[0099] 4. The viscosity ratio of the bright quenching oil prepared in Examples 1-3 and the control group 1-2 was tested according to SH / T0219-1992, which reflects the antioxidant property of the bright quenching oil.

[0100] 5. The brightness of the bright quenching oil prepared in Examples 1-3 and the control group 1-2 was tested according to SH / T0564-1993.

[0101] Table 1 Performance test results of bright quenching oil

[0102]

[0103] As can be seen from the analysis of examples 1-3 and control groups 1-2 and in combination with table 1, the bright quenching oil added with the PHPB-based composite antioxidant and the fatty acid imidazoline has excellent fluidity, thermal stability and brightness; in the control group 1, the prepared bright quenching oil does not add the PHPB-based composite antioxidant compared with examples 1-3, and the prepared bright quenching oil has poor high-temperature cleaning performance, the oxidation products generated at high temperature will react with the surface of the cooled workpiece, destroy the integrity of the workpiece surface, and cannot meet the surface requirements of precision parts; compared with examples 1-3, the bright quenching oil prepared in the control group 2 does not contain the fatty acid imidazoline, and a dense and continuous protective film cannot be formed on the surface of the workpiece during the high-temperature quenching process, which is difficult to effectively block the contact of oxygen, moisture and impurities with the workpiece, resulting in the formation of black spots and defects on the surface of the cooled workpiece, affecting the flatness.

[0104] Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still make modifications to the technical solutions recorded in the foregoing embodiments, or make equivalent replacements to part of the technical features, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A bright quenching oil, characterized by, It comprises the following components: 150SN base oil, PHPB-based composite antioxidant, sodium pentadecyl sulfonate, fatty acid imidazoline, polydimethylsiloxane and benzotriazole; the preparation method of the PHPB-based composite antioxidant comprises the following steps: PHPB is uniformly dispersed in toluene to obtain solution C; trimethyl hexamethylene diisocyanate and dibutyl tin dilaurate are uniformly dispersed in toluene to obtain solution D; solution C and solution D are uniformly mixed and reacted, then 3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionic acid, 3-mercapto-1,2-propanediol, tetraethyl hydroxyhexanediamide and dibutyl tin dilaurate are added and reacted, then the precipitate is collected after washing and vacuum drying to obtain the PHPB-based composite antioxidant.

2. A bright quenching oil according to claim 1, characterized in that: The mass ratio of the PHPB-based composite antioxidant to the fatty acid imidazoline is (1-16):

4.

3. The bright quenching oil according to claim 1, characterized in that: In the PHPB-based composite antioxidant, the mass ratio of trimethyl hexamethylene diisocyanate to PHPB is (1-4):

2.

4. The bright quenching oil of claim 1 wherein: The mass ratio of 3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionic acid, 3-mercapto-1,2-propanediol and tetraethyl hydroxyhexanediamide is (1.45-2.38):(0.65-1.07):

1.

5. The bright quenching oil according to claim 1, wherein The preparation method of the PHPB comprises the following steps: Mercaptoethanol and azobisisobutyronitrile are uniformly dispersed in tetrahydrofuran to obtain solution A; hydroxyl-terminated polybutadiene is uniformly dispersed in tetrahydrofuran to obtain solution B; solution A and solution B are uniformly mixed and reacted after being heated, then the precipitate is collected after washing and vacuum drying to obtain PHPB.

6. The bright quenching oil according to claim 1, wherein The preparation method of the fatty acid imidazoline comprises the following steps: Laurylic acid, hydroxyethyl ethylenediamine and toluene are uniformly mixed, heated and reacted, then the precipitate is collected after being washed and vacuum dried to obtain the fatty acid imidazoline.

7. A bright quenching oil according to claim 6, characterized in that: The molar ratio of laurylic acid to hydroxyethyl ethylenediamine is 6:(5-9).

8. A method for producing a bright quenching oil, characterized by, It comprises the following steps: 150SN base oil is heated and stirred, then PHPB-based composite antioxidant, sodium pentadecyl sulfonate and fatty acid imidazoline are added and stirred, then polydimethylsiloxane and benzotriazole are added, and the mixture is continuously stirred until it is uniformly mixed, then the temperature is lowered to room temperature, and the mixture is filtered after being sealed and placed for 12-48 hours to obtain bright quenching oil; the preparation method of the PHPB-based composite antioxidant comprises the following steps: PHPB is uniformly dispersed in toluene to obtain solution C; trimethyl hexamethylene diisocyanate and dibutyl tin dilaurate are uniformly dispersed in toluene to obtain solution D; solution C and solution D are uniformly mixed and reacted, then 3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionic acid, 3-mercapto-1,2-propanediol, tetraethyl hydroxyhexanediamide and dibutyl tin dilaurate are added and reacted, then the precipitate is collected after washing and vacuum drying to obtain the PHPB-based composite antioxidant.

9. A process for the preparation of a bright quenching oil according to claim 8, characterized in that: The sealed standing time is 12-48 hours.

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