Bright quenching oil and preparation method thereof

Abstract

The invention belongs to the technical field of quenching oil, and particularly provides bright quenching oil and a preparation method thereof, and the bright quenching oil comprises 150SN base oil, a PHPB-based composite antioxidant, sodium pentadecyl sulfonate, fatty acid imidazoline, polydimethylsiloxane and benzotriazole. The bright quenching oil prepared by the invention has an excellent cooling effect and good use durability, high surface brightness of a quenched workpiece can be guaranteed while the workpiece is efficiently cooled, and the oxidation resistance and the use durability of the quenching oil are improved by optimizing the additives, so that the service life of the quenching oil is prolonged, and the service life of the quenching oil is prolonged. And the process requirements of quenching of precision mechanical parts are met.

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 also put forward more stringent requirements for the performance of quenching oils.

[0003] The selection and application of quenching oil are crucial to the heat treatment process, and will directly affect the key indicators such as the performance, hardness and wear resistance of metal materials. Compared with water-based quenching medium, the traditional quenching oil has the advantages of higher boiling point, strong compatibility and simple formula, but gradually exposes technical shortcomings in the use process: the traditional quenching oil has more impurities, which easily penetrates 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 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, and can quickly reach the boiling state when contacting high-temperature workpieces, reducing the time lag in the boiling stage. However, the antioxidant system used in the technology 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: A bright quenching oil, comprising the following components: 150SN base oil, PHPB-based composite antioxidant, sodium pentadecyl sulfonate, fatty acid imidazoline, polydimethylsiloxane and benzotriazole.

[0007] 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.

[0008] 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.

[0009] Further, the mass ratio of the PHPB-based composite antioxidant and the fatty acid imidazoline is (1-16):4.

[0010] Further, the preparation method of the PHPB-based composite antioxidant comprises the following steps: 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.

[0011] Further, in the PHPB-based composite antioxidant, the mass ratio of trimethylhexamethylene diisocyanate and PHPB is (1-4):2.

[0012] 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.

[0013] Further, 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 heating, then the precipitate is collected after washing and vacuum drying to obtain PHPB.

[0014] Further, the preparation method of the fatty acid imidazoline comprises the following steps: Laurylic acid, hydroxyethyl ethylenediamine and toluene are uniformly mixed and reacted after heating, then the precipitate is collected after washing and vacuum drying to obtain the fatty acid imidazoline.

[0015] Furthermore, the molar ratio of lauric acid to hydroxyethyl ethylenediamine is 6:(5-9).

[0016] This application also provides a method for preparing bright quenching oil, comprising the following steps: Heat and stir the 150SN base oil, add PHPB-based complex antioxidant, sodium pentadecyl sulfonate and fatty acid imidazoline and stir, then add polydimethylsiloxane and benzotriazole, continue stirring until mixed, cool to room temperature and filter, seal and let stand to obtain bright quenching oil.

[0017] Furthermore, the sealing and settling time is 12-48 hours.

[0018] Compared with the prior art, this application has the following beneficial effects: 1. The PHPB-based composite antioxidant synthesized in this application uses PHPB as its backbone and precisely combines 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid (a free radical inhibitor), 3-mercapto-1,2-propanediol (a peroxide decomposition agent), and tetraethylhydroxyhexamethylenediamine (a compatibility modifier) ​​via trimethylhexamethylene diisocyanate to form a multifunctional antioxidant system. This system not only overcomes the limitations of traditional single-stage antioxidants, significantly improving the antioxidant performance of the system, but also enhances the thermal stability of the antioxidant components through the introduction of the PHPB backbone.

[0019] 2. The fatty acid imidazoline in this application can rapidly form a dense protective film on the surface of high-temperature workpieces, physically blocking oxygen and moisture from contacting the workpiece and preventing oxidation products from adhering to the workpiece surface. Furthermore, it can displace insoluble products already adhering to the workpiece surface, effectively ensuring a bright surface for quenched parts. Traditional fatty acid imidazolines are prone to thermal decomposition, oxidation, or destruction by peroxides in quenching oil during repeated high-temperature quenching, resulting in high loss rates and requiring frequent replenishment. However, the PHPB-based composite antioxidant can spontaneously enter the dense protective film through hydrogen bonding, enhancing the thermal stability of the fatty acid imidazoline. Moreover, by inhibiting the formation of peroxides, it significantly avoids oxidative damage to the fatty acid imidazoline, improving its service durability.

[0020] 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

[0021] The technical solutions in the embodiments of the present application will be clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work belong to the protection scope of the present application.

[0022] 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 in the description herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0023] In the case of using "comprising", "having", and "including" in the description herein, it is intended to cover non-exclusive inclusion, unless using the explicit limitation term, such as "only", "consisting of", etc., another component can be added.

[0024] The words "preferably", "more preferably", "preferably", "more preferably" and the like in the present application refer to the embodiments of the present application which can provide certain beneficial effects in certain cases. However, other embodiments can also be preferred in the same or other cases. In addition, the description of one or more preferred embodiments does not imply that other embodiments are not available, nor is it intended to exclude other embodiments from the scope of the present application. That is, in the present application, "preferably", "more preferably", "preferably", "more preferably" and the like are only to describe the implementation or embodiment with better effect, but do not constitute a limitation on the protection scope of the present application.

[0025] In the present application, "further", "more further", "in particular" and the like are used for the purpose of description, indicating the difference in content, but should not be understood as a limitation on the protection scope of the present application.

[0026] In the present application, "at least one" means more than one, such as one, two and more than two. The meaning of "multiple" or "several" is at least two, such as two, three, etc. The meaning of "multiple layers" is at least two layers, such as two layers, three layers, etc. unless otherwise explicitly specified. In the description of the present application, the meaning of "several" is at least one, such as one, two, etc. unless otherwise explicitly specified.

[0027] When a range of values is disclosed, unless otherwise stated, the endpoints of the ranges are included to along with every numerical value between the ends of the range. Further, any range of values can be combined with any other range of values to form a new range of values. Unless otherwise stated, all ranges include any and all sub-ranges unless otherwise stated. For example, a range of "1 C to 10 C" is intended to include any and all sub-ranges between (and including) the recited minimum and maximum values, i.e., all sub-ranges beginning with a minimum value below 1 C and ending with a maximum value less than 10 C, as well as all sub-ranges beginning with a minimum value less than 10 C and ending with a maximum value greater than 1 C. In addition, it is specifically intended that the scope of the present application include "mixed" binary ranges (e.g., 2-10.1 C) where the lower limit and the upper limit of the range are integers and the integer is not between the two endpoints (e.g., 1-5 C is not included within the scope of the application, but 2-10 C is included).

[0028] Unless otherwise indicated, all steps of the application can be performed in any order. For example, the method comprises steps (a) and (b) means that the method can comprise steps (a) and (b) in sequence, or steps (b) and (a) in sequence. For example, the method can further comprise step (c) 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 a term can include the plural form and should not be understood as having a quantity of one.

[0029] In the present application, "above" or "below" includes the number itself. For example, 1 below includes 1.

[0030] In the present application, room temperature refers to 0-40℃, including but not limited to 10-40℃, or further 20-30℃.

[0031] The application will be further described by the following examples, but not limited to the scope of the application.

[0032] When a numerical range is given in the examples, it should be understood that, unless otherwise stated in the application, each numerical range has two endpoints and any number between the two endpoints can be selected. Unless otherwise defined, all technical and scientific terms used in the application have the same meaning as commonly understood by a person skilled in the art. If the specific conditions are not indicated in the examples, the conventional conditions or the conditions recommended by the manufacturer are used. If the manufacturer of all reagents or instruments is not indicated, it is a conventional product that can be purchased on the market. In addition to the specific methods, devices, materials used in the examples, any method, device and material of the prior art similar or equivalent to the methods, devices and materials described in the examples of the present application can also be used to realize the present application according to the mastery of the prior art by a person skilled in the art and the description of the present application.

[0033] Example 1 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.

[0034] The preparation method of the PHPB-based composite antioxidant of the present embodiment comprises the following steps: 2g mercaptoethanol and 0.02g azobisisobutyronitrile are uniformly dispersed in 10mL tetrahydrofuran to obtain solution A; 10g hydroxyl-terminated polybutadiene is uniformly dispersed in 20mL tetrahydrofuran to obtain solution B; solution A and solution B are mixed and heated to 60℃ for 3 hours, then the solvent is removed by rotary evaporation, the collected precipitate is washed with tetrahydrofuran and methanol in sequence, and dried under vacuum at 60℃ to obtain PHPB; 10g PHPB is uniformly dispersed in 40mL toluene to obtain solution C; 15g trimethylhexamethylene diisocyanate and 0.06g dibutyltin dilaurate are uniformly dispersed in 40mL toluene to obtain solution D; solution C and solution D are uniformly mixed and reacted at 35℃ for 4.5 hours, then heated to 70℃, 6.9g 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid, 1.9g 3-mercapto-1,2-propanediol, 2.9g tetraethylenepentamine and 0.2g dibutyltin dilaurate are added, uniformly mixed and reacted for another 8 hours, the solvent is removed by rotary evaporation, and the collected precipitate is washed with toluene and methanol, and dried under vacuum at 60℃ to obtain the PHPB-based composite antioxidant.

[0035] The preparation method of the fatty acid imidazoline of the present embodiment comprises the following steps: 10.0g lauric acid, 6.2g hydroxyethyl ethylenediamine and 50mL toluene are uniformly mixed, heated to 100℃ and reacted for 6 hours, then heated to 180℃ and reacted for another 4 hours, cooled to room temperature, transferred to a separatory funnel, washed with 60℃ deionized water, separated into organic phase and washed with anhydrous ethanol, and dried under vacuum at 60℃ to obtain the fatty acid imidazoline.

[0036] The preparation method of the bright quenching oil of the present embodiment comprises the following steps: 935g 150SN base oil is weighed, heated to 60℃ and stirred for 30 minutes, then 30g PHPB-based composite antioxidant, 5g sodium pentadecyl sulfonate and 20g fatty acid imidazoline are added, stirred for another 1 hour, then 5g polydimethylsiloxane and 5g benzotriazole are added, stirred for another 2 hours, then heating is stopped, cooled to room temperature, filtered, and sealed and placed at room temperature for 24 hours to obtain the bright quenching oil.

[0037] Example 2 The bright quenching oil of the embodiment is composed of 150SN base oil, PHPB-based composite antioxidant, sodium pentadecyl sulfonate, fatty acid imidazoline, polydimethylsiloxane and benzotriazole.

[0038] The preparation method of the PHPB-based composite antioxidant of the embodiment comprises the following steps: 2g mercaptoethanol and 0.02g azobisisobutyronitrile are uniformly dispersed in 10mL tetrahydrofuran to obtain solution A; 10g hydroxyl-terminated polybutadiene is uniformly dispersed in 20mL tetrahydrofuran to obtain solution B; solution A and solution B are mixed and heated to 60℃ for reaction for 3 hours, and then the solvent is removed by rotary evaporation, the collected precipitate is washed with tetrahydrofuran and methanol in sequence, and dried under vacuum at 60℃ to obtain PHPB; 10g PHPB is uniformly dispersed in 40mL toluene to obtain solution C; 5g trimethylhexamethylene diisocyanate and 0.06g dibutyltin dilaurate are uniformly dispersed in 40mL toluene to obtain solution D; solution C and solution D are uniformly mixed and reacted at 35℃ for 4.5 hours, and then heated to 70℃, 5.6g 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid, 2.5g 3-mercapto-1,2-propanediol, 2.9g tetraethylenepentamine and 0.2g dibutyltin dilaurate are added, uniformly mixed and reacted for another 8 hours, the solvent is removed by rotary evaporation, and the collected precipitate is washed with toluene and methanol, and dried under vacuum at 60℃ to obtain the PHPB-based composite antioxidant.

[0039] The preparation method of the fatty acid imidazoline of the embodiment comprises the following steps: 10.0g lauric acid, 4.3g hydroxyethyl ethylenediamine and 50mL toluene are uniformly mixed, heated to 100℃ for reaction for 6 hours, and then heated to 180℃ for reaction for another 4 hours, and then transferred to a separatory funnel and washed with deionized water at 60℃, and then separated into organic phase and washed with anhydrous ethanol, and dried under vacuum at 60℃ to obtain the fatty acid imidazoline.

[0040] The preparation method of the bright quenching oil of the embodiment comprises the following steps: 935g 150SN base oil is weighed, heated to 60℃ and stirred for 30 minutes, and then 40g PHPB-based composite antioxidant, 5g sodium pentadecyl sulfonate and 10g fatty acid imidazoline are added, and stirred for 1 hour, and then 5g polydimethylsiloxane and 5g benzotriazole are added, and stirred for another 2 hours, and then heating is stopped, and the temperature is reduced to room temperature, and filtered, and sealed and placed at room temperature for 12 hours to obtain the bright quenching oil.

[0041] Example 3 The bright quenching oil of this example is composed of 150SN base oil, PHPB-based composite antioxidant, sodium pentadecyl sulfonate, fatty acid imidazoline, polydimethylsiloxane and benzotriazole.

[0042] The preparation method of the PHPB-based composite antioxidant of this example comprises the following steps: 2g mercaptoethanol and 0.02g azobisisobutyronitrile were uniformly dispersed in 10mL tetrahydrofuran to obtain solution A; 10g hydroxyl-terminated polybutadiene was uniformly dispersed in 20mL tetrahydrofuran to obtain solution B; 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; 10g PHPB was uniformly dispersed in 40mL toluene to obtain solution C; 20g trimethylhexamethylene diisocyanate and 0.06g dibutyltin dilaurate were uniformly dispersed in 40mL toluene to obtain solution D; Solutions C and D were uniformly mixed and reacted at 35℃ for 4.5 hours, then heated to 70℃, 4.2g 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid, 3.1g 3-mercapto-1,2-propanediol, 2.9g tetraethylenepentamine and 0.2g dibutyltin dilaurate were added, uniformly mixed and 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.

[0043] The preparation method of the fatty acid imidazoline of this example comprises the following steps: 10.0g lauric acid, 7.8g hydroxyethyl ethylenediamine and 50mL toluene were uniformly mixed, heated to 100℃ and reacted for 6 hours, then heated to 180℃ and reacted for another 4 hours, cooled to room temperature, transferred to a separatory funnel, washed with 60℃ deionized water, separated the organic phase, washed with anhydrous ethanol, and dried under vacuum at 60℃ to obtain the fatty acid imidazoline.

[0044] The preparation method of the bright quenching oil of this example comprises the following steps: 935g 150SN base oil was weighed, heated to 60℃ and stirred for 30 minutes, then 10g PHPB-based composite antioxidant, 5g sodium pentadecyl sulfonate and 40g fatty acid imidazoline were added, stirred for another 1 hour, then 5g polydimethylsiloxane and 5g benzotriazole were added, stirred for another 2 hours, then the heating was stopped, cooled to room temperature, filtered, and sealed and placed at room temperature for 48 hours to obtain the bright quenching oil.

[0045] Control group 1 The bright quenching oil of the present control group is composed of 150SN base oil, sodium pentadecyl sulfonate, fatty acid imidazoline, polydimethylsiloxane and benzotriazole.

[0046] The preparation method of the fatty acid imidazoline of the present control group comprises the following steps: Uniformly mix 10.0 g of lauric acid, 6.2 g of hydroxyethyl ethylenediamine and 50 mL of toluene, 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 layering, wash with anhydrous ethanol, and dry at 60°C under vacuum to obtain the fatty acid imidazoline.

[0047] The preparation method of the bright quenching oil of the present control group comprises the following steps: 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.

[0048] Control group 2 The bright quenching oil of the present control group is composed of 150SN base oil, PHPB-based composite antioxidant, sodium pentadecyl sulfonate, polydimethylsiloxane and benzotriazole.

[0049] The preparation method of the PHPB-based composite antioxidant of the present control group comprises the following steps: Disperse 2 g of mercaptoethanol and 0.02 g of azobisisobutyronitrile uniformly in 10 mL of tetrahydrofuran to obtain solution A; Disperse 10 g of hydroxyl-terminated polybutadiene uniformly in 20 mL of tetrahydrofuran to obtain solution B; 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; Disperse 10 g of PHPB uniformly in 40 mL of toluene to obtain solution C; Disperse 15 g of trimethylhexamethylene diisocyanate and 0.06 g of dibutyltin dilaurate uniformly in 40 mL of toluene to obtain solution D; 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, 5.6g of 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid, 3.5g of 3-mercapto-1,2-propanediol, 6.4g of tetraethylenepentamine and 0.2g 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.

[0050] The preparation method of the bright quenching oil of the control group comprises the following steps: 935g of 150SN base oil was weighed, heated to 60°C and stirred for 30 minutes, then 50g of the PHPB-based composite antioxidant and 5g of sodium pentadecyl sulfonate were added, and stirring was continued for 1 hour, then 5g of polydimethylsiloxane and 5g 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.

[0051] Performance test 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.

[0052] 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.

[0053] 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.

[0054] 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, to reflect the antioxidant property of the bright quenching oil.

[0055] 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.

[0056] Table 1 Performance test results of bright quenching oil 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.

[0057] 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.

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. A bright quenching oil according to claim 1, characterized in that: The preparation method of the PHPB-based composite antioxidant comprises the following steps: 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.

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

2.

5. A bright quenching oil according to claim 3, characterized in that: 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.

6. The bright quenching oil according to claim 3, 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.

7. 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 and reacted after being heated, then the precipitate is collected after being washed and cooled, and vacuum drying is performed to obtain the fatty acid imidazoline.

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

9. A method for producing a bright quenching oil, characterized by, It comprises the following steps: 150SN base oil is heated and stirred, PHPB-based composite antioxidant, sodium pentadecyl sulfonate and fatty acid imidazoline are added and stirred, then polydimethylsiloxane and benzotriazole are added, and the stirring is continued until the mixture 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.

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

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