Quenching oil composition and preparation method thereof

Abstract

The invention belongs to the technical field of quenching oil, and discloses a quenching oil composition and a preparation method thereof, the quenching oil composition comprises the following raw materials by weight: 90-95 parts of synthetic ester base oil, 5-10 parts of a cooling accelerant, 0.5-2 parts of an antioxidant and 1-3 parts of a demulsifier; the synthetic ester base oil is neopentyl polyol ester, the synthetic raw materials of the neopentyl polyol ester comprise neopentyl polyol and fatty acid, and the fatty acid is saturated monobasic fatty acid with the carbon atom number of C5-C10. The environment-friendly quenching oil composition is prepared by synthesizing neopentyl polyol ester from specific neopentyl polyol and C5-C10 saturated monobasic fatty acid and using the neopentyl polyol ester as base oil, and the quenching oil composition generates less oil fume during use, is excellent in oxidation resistance and long in service life, has 100% biodegradability, and is suitable for industrial production. Therefore, the method can be popularized and used in the technical field of quenching oil, and certain economic benefits are brought to the steelmaking industry.

Description

Technical Field

[0001] The invention belongs to the technical field of quenching oil, and particularly relates to a quenching oil composition and a preparation method thereof. Background Art

[0002] With the rapid development of my country's industrialization, my country has become one of the largest steel-using countries in the world. For steel for different purposes, the application requirements for the hardness and wear resistance of steel will become higher and higher. At present, the quenching process is commonly used to improve the strength and hardness of steel. Quenching oil is a crucial auxiliary agent in the quenching process. Quenching oil can quickly cool steel, ensure the transformation of metal structure, improve the hardness of steel, and reduce the deformation and cracking of steel.

[0003] Most of the quenching oils currently used in the industry use mineral oil as the base oil. There are problems such as large smoke, heavy smell, and high VOC (volatile organic compound) emissions during use. At the same time, mineral oil is non-degradable and harmful to the soil and biological environment. The treatment of waste mineral oil is also a difficult problem in the industry. The industry has also proposed using plant-based as the base oil to prepare degradable and environmentally friendly quenching oil, but the plant-based contains a large amount of unsaturated bonds (carbon-carbon double bonds), which will cause the quenching oil to have poor antioxidant ability and a short service life. Therefore, it is of great significance to develop an environmentally friendly, degradable, and long-life quenching oil. Summary of the invention

[0004] The present invention aims to improve at least one technical problem in the background technology.

[0005] On the one hand, the present invention provides a quenching oil composition, comprising the following raw materials in parts by weight: 90-95 parts of synthetic ester base oil, 5-10 parts of catalyzer, 0.5-2 parts of antioxidant and 1-3 parts of demulsifier; the synthetic ester base oil is neopentyl polyol ester, the synthetic raw materials of the neopentyl polyol ester include neopentyl polyol and fatty acid, and the fatty acid is a saturated monobasic fatty acid with a carbon atom number of C5-C10.

[0006] The invention adopts synthetic ester as the base oil of quenching oil, adds a refrigerant, an antioxidant and a demulsifier to obtain a quenching oil composition. The synthetic ester as the base oil of quenching oil can achieve 100% biodegradability, and the prepared quenching oil composition is an environmentally friendly quenching oil composition.

[0007] The synthetic ester base oil of the present invention is a neopentyl polyol ester. The neopentyl polyol ester has a steric hindrance structure formed by a neopentyl group, and has no hydrogen atom on the β carbon atom. It can form a six-atom resonance structure ring with hydroxyl oxygen. The structure of the ester can be destroyed only under higher energy. Therefore, the neopentyl synthetic ester has excellent thermal stability and hydrolysis resistance stability, can greatly improve the service life of the quenching oil, and solve the problem of large smoke.

[0008] The fatty acid in the synthetic raw material of the synthetic ester base oil of the present invention is a saturated monobasic fatty acid. The saturated fatty acid does not have a carbon-carbon double bond and can improve the anti-oxidation ability of the quenching oil. In addition, the present invention specifically selects a saturated monobasic fatty acid with a carbon atom number of C5-C10. If the carbon atom number is less than 5, the synthesized fatty acid ester has greater corrosiveness and will corrode quenching equipment and quenching workpieces, affecting the brightness of the quenching workpieces. If the carbon atom number is greater than 10, the synthesized fatty acid ester has a higher pour point and poor fluidity, resulting in poor cooling performance of the quenching oil.

[0009] Furthermore, the esterification rate of the neopentyl polyol ester is ≥95%, and the higher the esterification rate, the higher the thermal stability and antioxidant properties of the quenching oil.

[0010] Further, the neopentyl polyol includes at least one of neopentyl glycol, trimethylolpropane, pentaerythritol and dipentaerythritol, and the saturated monobasic fatty acid includes at least one of n-pentanoic acid, neopentanoic acid, n-hexanoic acid, n-heptanoic acid, n-octanoic acid, isooctanoic acid, isononanoic acid and decanoic acid.

[0011] Furthermore, neopentyl polyol ester is synthesized from synthetic raw materials in the presence of a catalyst, the mass ratio of the catalyst to the synthetic raw materials is ≤0.01, the catalyst is a titanate catalyst or a tin-containing catalyst, the titanate catalyst includes at least one of n-butyl titanate and isopropyl titanate, and the tin-containing catalyst includes at least one of tin oxide, stannous oxide and stannous oxalate.

[0012] Furthermore, the refrigeration agent is polyisobutylene, which is a non-volatile liquid with stable chemical properties and will not form residues at high temperatures.

[0013] Furthermore, the average molecular weight of polyisobutylene is ≥1000, which makes it easier for the quenching oil to maintain a good cooling effect at high temperatures.

[0014] Furthermore, the antioxidant is at least one of 2,6-di-tert-butyl-p-cresol, 2,6-di-tert-butylphenol, 3,5-di-tert-butyl-4-hydroxyphenylpropionate, octyl / butyl diphenylamine and liquid high molecular weight phenol antioxidants.

[0015] Furthermore, the demulsifier includes an amine and at least one of an epoxy compound and a polyether compound.

[0016] On the other hand, the present invention provides a method for preparing the above-mentioned quenching oil composition, characterized in that it comprises the following steps:

[0017] Add a refrigerant, an antioxidant and a demulsifier to the synthetic ester base oil, mix well, and perform vacuum dehydration. The vacuum degree of the vacuum dehydration is 0.25Mpa-0.35Mpa. The vacuum dehydration is stopped when the water content is ≤300ppm to obtain a quenching oil composition.

[0018] Further, the preparation method of the synthetic ester base oil comprises the following steps:

[0019] Mixing neopentyl polyol, fatty acid and catalyst, wherein the fatty acid is in excess of 20%-30% by mole, heating to a first temperature of 160°C-180°C, keeping the temperature for 2h-3h, and then heating to a second temperature of 230°C-240°C, keeping the temperature until the acid value of the sample is ≤3mg KOH / g, to obtain reactant A;

[0020] The reactant A is cooled to 190°C-210°C, and the temperature is maintained for vacuum distillation. The vacuum degree of the vacuum distillation is 0.5Mpa. The vacuum distillation is stopped when the acid value of the sample is ≤1.0mg KOH / g to obtain the reactant B;

[0021] The reactant B is cooled to a third temperature of 80° C. to 90° C., and while maintaining the third temperature, the impurity removal treatment is performed several times until the acid value of the sample is ≤0.2 mg KOH / g, thereby obtaining a synthetic ester base oil;

[0022] The impurity removal process includes: adding a 10% NaOH solution, the amount of which is 10% of the mass of the synthetic raw material, mixing, standing for stratification, removing the lower layer of liquid, and then adding 10% of the mass of the synthetic raw material of water, mixing, standing for stratification, and removing the lower layer of liquid. The purpose of the impurity removal treatment is to remove the fatty acids remaining in the reaction.

[0023] The beneficial effects of the present invention are as follows: the present invention adopts specific neopentyl polyol and saturated monobasic fatty acid with carbon number of C5-C10 to synthesize neopentyl polyol ester, and uses the ester as base oil to prepare an environmentally friendly quenching oil composition. The quenching oil composition generates less oil smoke when used, has excellent antioxidant ability, long service life, 100% biodegradability, and convenient waste oil treatment. Therefore, the present invention can be promoted and used in the field of quenching oil technology, bringing certain economic benefits to the steelmaking industry. DETAILED DESCRIPTION

[0024] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the content of the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms fall within the scope limited by the appended claims of the application equally.

[0025] The reagents / raw materials involved in the embodiments and comparative examples include:

[0026] No. 10 white oil (paraffin base): Guangdong Zhonghai Nanlian New Energy Co., Ltd.

[0027] 150N base oil: Guangdong Zhonghai Nanlian New Energy Co., Ltd.

[0028] Rapeseed oil: Guangzhou Qisheng Chemical Trading Co., Ltd.

[0029] Polyisobutylene PIB1300: Shandong Hongrui New Material Technology Co., Ltd.

[0030] Polyisobutylene PIB2400: Shandong Hongrui New Material Technology Co., Ltd.

[0031] 2,6-Di-tert-butylphenol BHT: Dongguan Hersbit Chemical Co., Ltd.

[0032] Octyl / Butyl Diphenylamine L57: Dongguan Hersbit Chemical Co., Ltd.

[0033] Amines and Epoxides T1001: Guangzhou Ruishengyan Chemical Technology Co., Ltd.

[0034] Polyether compound DL-32: Guangzhou Ruishengyan Chemical Technology Co., Ltd.

[0035] Example 1

[0036] A quenching oil composition comprises the following raw materials by weight: 91 parts of neopentyl glycol C8C9 ester, 7 parts of polyisobutylene PIB2400, 1 part of octyl / butyl diphenylamine L57, and 1 part of amine and epoxy compound T1001.

[0037] The preparation method is as follows:

[0038] To 91 parts by weight of neopentyl glycol C8C9 ester, add 7 parts by weight of polyisobutylene PIB2400, 1 part by weight of octyl / butyl diphenylamine L57 and 1 part by weight of amine and epoxy compound T1001, mix well, and perform vacuum dehydration with a vacuum degree of 0.3 MPa. The vacuum dehydration is stopped when the water content is ≤300 ppm to obtain a quenching oil composition.

[0039] The preparation method of neopentyl glycol C8C9 ester is as follows:

[0040] 23 parts by weight of neopentyl glycol, 69 parts by weight of isooctanoic acid, 8 parts by weight of isononanoic acid and 0.5 parts by weight of stannous oxalate were mixed, the temperature was raised to 180° C., and the temperature was kept for 2 hours, and the temperature was further raised to 240° C. and the temperature was kept for 10 hours. The acid value of the sample was 2 mg KOH / g, and a reactant A was obtained;

[0041] The reactant A was cooled to 200°C and kept warm for vacuum distillation. The vacuum degree of the vacuum distillation was 0.5 MPa. The vacuum distillation was carried out for 2 hours. The acid value of the sample was 0.8 mg KOH / g, and the reactant B was obtained.

[0042] The reactant B was cooled to 85°C, and while maintaining the temperature at 85°C, 10 parts by weight of a 10% NaOH solution was added, stirred for 1 hour, allowed to stand for 1 hour to separate into layers, and the lower aqueous layer was removed. While continuing to maintain the temperature at 85°C, 10 parts by weight of water was added, stirred for 1 hour, allowed to stand for 1 hour to separate into layers, and the lower aqueous layer was removed. The acid value of the sample was 0.1 mg KOH / g, and neopentyl glycol C8C9 ester was obtained.

[0043] Example 2

[0044] A quenching oil composition, the raw materials of which include, by weight: 91.5 parts of pentaerythritol C5C7 ester, 6 parts of polyisobutylene PIB1300, 1 part of octyl / butyl diphenylamine L57, 0.5 part of 2,6-di-tert-butylphenol BHT, 0.5 part of amine and epoxy compound T1001, and 0.5 part of polyether compound DL-32.

[0045] The preparation method is as follows:

[0046] To 91.5 parts by weight of pentaerythritol C5C7 ester, add 6 parts by weight of polyisobutylene PIB1300, 1 part by weight of octyl / butyl diphenylamine L57, 0.5 parts by weight of 2,6-di-tert-butylphenol BHT, 1 part by weight of amine and epoxy compound T1001 and 0.5 parts by weight of polyether compound DL-32, mix well, and perform vacuum dehydration with a vacuum degree of 0.3 MPa. The vacuum dehydration is stopped when the water content is ≤300 ppm to obtain a quenching oil composition.

[0047] The preparation method of pentaerythritol C5C7 ester is as follows:

[0048] 19 parts by weight of pentaerythritol, 35 parts by weight of n-pentanoic acid, 46 parts by weight of n-heptanoic acid and 0.6 parts by weight of n-butyl titanate were mixed, heated to 180° C., kept warm for 2 hours, and then heated to 240° C., kept warm for 10 hours. The acid value of the sample was 1.5 mg KOH / g, to obtain reactant A;

[0049] The reactant A was cooled to 200°C and kept warm for vacuum distillation. The vacuum degree of the vacuum distillation was 0.5 MPa. The vacuum distillation was carried out for 2 hours. The acid value of the sample was 0.6 mg KOH / g, and the reactant B was obtained.

[0050] The reactant B was cooled to 85°C, and while maintaining the temperature at 85°C, 10 parts by weight of a 10% NaOH solution was added, stirred for 1 hour, allowed to stand for 1 hour to separate layers, and the lower aqueous layer was removed. The temperature was continued to be maintained at 85°C, and 10 parts by weight of water was added, stirred for 1 hour, allowed to stand for 1 hour to separate layers, and the lower aqueous layer was removed. The acid value of the sample was 0.1 mg KOH / g, and pentaerythritol C5C7 ester was obtained.

[0051] Example 3

[0052] A quenching oil composition comprises the following raw materials by weight: 92 parts of pentaerythritol C5C7C9 ester and dipentaerythritol C5C7C9 ester, 5 parts of polyisobutylene PIB1300, 2 parts of octyl / butyl diphenylamine L57, and 1 part of amine and epoxy compound T1001.

[0053] The preparation method is as follows:

[0054] To 92 parts by weight of pentaerythritol C5C7C9 ester and dipentaerythritol C5C7C9 ester, add 5 parts by weight of polyisobutylene PIB1300, 2 parts by weight of octyl / butyl diphenylamine L57 and 1 part by weight of amine and epoxy compound T1001, mix well, and perform vacuum dehydration with a vacuum degree of 0.3 MPa. The vacuum dehydration is stopped when the water content is ≤300 ppm to obtain a quenching oil composition.

[0055] The preparation methods of pentaerythritol C5C7C9 ester and dipentaerythritol C5C7C9 are as follows:

[0056] 13 parts by weight of pentaerythritol, 1 part by weight of dipentaerythritol, 22 parts by weight of n-pentaerythritol, 28 parts by weight of n-heptanoic acid, 35 parts by weight of isononanoic acid and 0.8 parts by weight of isopropyl titanate were mixed, the temperature was raised to 180° C., the temperature was kept for 2 hours, the temperature was further raised to 240° C., the temperature was kept for 10 hours, and the acid value of the sample was 2 mg KOH / g, to obtain reactant A;

[0057] The reactant A was cooled to 200°C and kept warm for vacuum distillation. The vacuum degree of the vacuum distillation was 0.5 MPa. The vacuum distillation was carried out for 2 hours. The acid value of the sample was 0.6 mg KOH / g, and the reactant B was obtained.

[0058] The reactant B was cooled to 85°C, and while maintaining the temperature at 85°C, 10 parts by weight of a 10% NaOH solution was added, the mixture was stirred for 1 hour, and the mixture was allowed to stand for 1 hour to separate into layers. The lower aqueous layer was removed, and the temperature was continued to be maintained at 85°C. 10 parts by weight of water was added, the mixture was stirred for 1 hour, and the mixture was allowed to stand for 1 hour to separate into layers. The lower aqueous layer was removed, and the acid value of the sample was 0.08 mg KOH / g. Pentaerythritol C5C7C9 ester and dipentaerythritol C5C7C9 were obtained.

[0059] Example 4

[0060] A quenching oil composition comprises the following raw materials by weight: 91 parts of pentaerythritol C8C9 ester, 7 parts of polyisobutylene PIB1300, 1 part of octyl / butyl diphenylamine L57, and 1 part of polyether compound DL-32.

[0061] The preparation method is as follows:

[0062] To 91 parts by weight of pentaerythritol C8C9 ester, add 7 parts by weight of polyisobutylene PIB1300, 1 part by weight of octyl / butyl diphenylamine L57 and 1 part by weight of polyether compound DL-32, mix well, and perform vacuum dehydration with a vacuum degree of 0.3 MPa. The vacuum dehydration is stopped when the water content is ≤300 ppm to obtain a quenching oil composition.

[0063] The preparation method of pentaerythritol C8C9 ester is as follows:

[0064] 16 parts by weight of pentaerythritol, 46 parts by weight of isooctanoic acid, 44 parts by weight of isononanoic acid and 0.5 parts by weight of stannous oxalate were mixed, the temperature was raised to 180° C., the temperature was kept for 2 hours, the temperature was further raised to 240° C., the temperature was kept for 10 hours, and the acid value of the sample was 2 mg KOH / g, to obtain reactant A;

[0065] The reactant A was cooled to 200°C and kept warm for vacuum distillation. The vacuum degree of the vacuum distillation was 0.5 MPa. The vacuum distillation was carried out for 2 hours. The acid value of the sample was 0.6 mg KOH / g, and the reactant B was obtained.

[0066] The reactant B was cooled to 85°C, and while maintaining the temperature at 85°C, 10 parts by weight of a 10% NaOH solution was added, stirred for 1 hour, allowed to stand for 1 hour to separate layers, and the lower aqueous layer was removed. While continuing to maintain the temperature at 85°C, 10 parts by weight of water was added, stirred for 1 hour, allowed to stand for 1 hour to separate layers, and the lower aqueous layer was removed. The acid value of the sample was 0.1 mg KOH / g, and pentaerythritol C8C9 ester was obtained.

[0067] Comparative Example 1

[0068] A quenching oil composition comprises the following raw materials by weight: 91 parts of No. 10 white oil (paraffin base), 7 parts of polyisobutylene PIB2400, 1 part of octyl / butyl diphenylamine L57, and 1 part of amine and epoxy compound T1001.

[0069] The preparation method is as follows:

[0070] To 91 parts by weight of No. 10 white oil (paraffin base), add 7 parts by weight of polyisobutylene PIB2400, 1 part by weight of octyl / butyl diphenylamine L57 and 1 part by weight of amine and epoxy compound T1001, mix well, and perform vacuum dehydration with a vacuum degree of 0.3 MPa. The vacuum dehydration is stopped when the water content is ≤300 ppm to obtain a quenching oil composition.

[0071] Comparative Example 2

[0072] A quenching oil composition, the raw materials of which include, by weight: 73 parts of No. 10 white oil (paraffin base), 20 parts of 150N base oil, 6 parts of polyisobutylene PIB1300, 1 part of octyl / butyl diphenylamine L57, 0.5 part of 2,6-di-tert-butylphenol BHT, 10.5 parts of amine and epoxy compound T100, and 0.5 part of polyether compound DL-32.

[0073] The preparation method is as follows:

[0074] 73 parts by weight of No. 10 white oil (paraffin base) and 20 parts by weight of 150N base oil are mixed, 6 parts by weight of polyisobutylene PIB1300, 1 part by weight of octyl / butyl diphenylamine L57, 0.5 parts by weight of 2,6-di-tert-butylphenol BHT, 1 part by weight of amine and epoxy compound T1001 and 0.5 parts by weight of polyether compound DL-32 are added, mixed, and vacuum dehydration is performed. The vacuum degree of vacuum dehydration is 0.3 MPa, and the vacuum dehydration is stopped when the water content is ≤300 ppm to obtain a quenching oil composition.

[0075] Comparative Example 3

[0076] A quenching oil composition comprises the following raw materials by weight: 92 parts of rapeseed oil, 5 parts of polyisobutylene PIB1300, 2 parts of octyl / butyl diphenylamine L57, and 11 parts of amine and epoxy compound T100.

[0077] The preparation method is as follows:

[0078] 5 parts by weight of polyisobutylene PIB1300, 2 parts by weight of octyl / butyl diphenylamine L57 and 1 part by weight of amine and epoxy compound T1001 were added to 92 parts by weight of rapeseed oil, mixed well, and vacuum dehydration was performed with a vacuum degree of 0.3 MPa. The vacuum dehydration was stopped when the water content was ≤300 ppm to obtain a quenching oil composition.

[0079] Comparative Example 4

[0080] A quenching oil composition, which is different from Example 1 only in that the synthetic ester base oil in the raw material of the quenching oil composition is neopentyl glycol C4C9 ester.

[0081] Comparative Example 5

[0082] A quenching oil composition, which is different from Example 1 only in that the synthetic ester base oil in the raw material of the quenching oil composition is neopentyl glycol C12 ester.

[0083] The test method of the quenching oil composition prepared in the examples and comparative examples of the present application is as follows:

[0084] 40℃ viscosity: in accordance with GB / T265-1988 petroleum product kinematic viscosity test method and dynamic viscosity calculation method;

[0085] 100℃ viscosity: in accordance with GB / T265-1988 petroleum product kinematic viscosity test method and dynamic viscosity calculation method;

[0086] Viscosity index: in accordance with GB / T265-1988 petroleum product kinematic viscosity test method and dynamic viscosity calculation method;

[0087] Open cup flash point: According to GB / T 3536-2008 Cleveland open cup method for testing flash point and fire point of petroleum products;

[0088] Pour point: in accordance with GB / T3535-2006 petroleum product pour point test method;

[0089] Acid value: According to GB / T264-1991 method for determining the acid value of petroleum products;

[0090] Moisture content: in accordance with GB / T11133-1989 liquid petroleum product water content test method (Karl Fischer method);

[0091] Rotating oxygen bomb: according to SH / T0193-2008 determination of lubricating oil oxidation stability;

[0092] Maximum cooling rate: According to JB / T7951 nickel alloy probe test method for determining the cooling performance of industrial quenching oil;

[0093] Biodegradability: Evaluation of the potential biodegradability and disintegration of materials under the action of specific microorganisms in accordance with GB / T19275-2003;

[0094] Copper strip corrosion test: in accordance with GB / T5096 petroleum product copper strip corrosion test method.

[0095] Table 1 Test results of quenching oil compositions prepared in the examples and comparative examples of the present application

[0096]

[0097] From the data comparison of Examples 1-2 and Comparative Examples 1-2, it can be seen that the biodegradability of the quenching oil composition of the present invention is much higher than that of the mineral oil-based quenching oil on the market, and it is more environmentally friendly; under the same viscosity grade, the numerical comparison of the open flash point is carried out, and it can be seen that the open flash point of the quenching oil composition of the present invention is much higher than that of the mineral oil-based quenching oil, which can avoid the problem of large oil smoke during quenching, and the quenching oil has a wider operating temperature.

[0098] From the data comparison of Examples 1-3 and Comparative Examples 1-3, it can be seen that the rotating oxygen bomb data of the quenching oil composition of the present invention is much higher than that of mineral oil-based quenching oil and vegetable oil-based quenching oil, indicating that the quenching oil of the present invention has good antioxidant ability and longer service life.

[0099] From the data comparison of Example 1 and Comparative Example 4, it can be seen that the copper sheet corrosion of the quenching oil composition of the present invention is much better than that of the saturated polyol ester composition with a fatty acid carbon number of less than 5, indicating that the quenching oil composition of the present invention has better metal corrosion resistance.

[0100] From the comparison of the data of Example 1 and Comparative Example 5, it can be seen that the maximum cooling rate of the quenching oil composition of the present invention is much greater than that of the saturated polyol ester composition having a fatty acid carbon number greater than 10, indicating that the quenching oil composition of the present invention has excellent cooling performance.

[0101] The above is only a preferred embodiment of the present invention. It should be pointed out that ordinary technicians in this technical field can make several improvements and supplements without departing from the method of the present invention. These improvements and supplements should also be regarded as the scope of protection of the present invention.

Claims

1. A quenching oil composition, characterized in that: The invention comprises the following raw materials in parts by weight: 90-95 parts of synthetic ester base oil, 5-10 parts of catalytic agent, 0.5-2 parts of antioxidant and 1-3 parts of demulsifier; the synthetic ester base oil is neopentyl polyol ester, the synthetic raw materials of the neopentyl polyol ester include neopentyl polyol and fatty acid, and the fatty acid is a saturated monobasic fatty acid with carbon number of C5-C10.

2. The quenching oil composition according to claim 1, characterized in that The esterification rate of the neopentyl polyol ester is ≥95%.

3. The quenching oil composition according to claim 1, characterized in that The neopentyl polyol includes at least one of neopentyl glycol, trimethylolpropane, pentaerythritol and dipentaerythritol, and the saturated monobasic fatty acid includes at least one of n-pentanoic acid, neopentanoic acid, n-hexanoic acid, n-heptanoic acid, n-octanoic acid, isooctanoic acid, isononanoic acid and decanoic acid.

4. The quenching oil composition according to claim 1, characterized in that The neopentyl polyol ester is synthesized from the synthetic raw material in the presence of a catalyst, the mass ratio of the catalyst to the synthetic raw material is ≤0.01, the catalyst is a titanate catalyst or a tin-containing catalyst, the titanate catalyst includes at least one of n-butyl titanate and isopropyl titanate, and the tin-containing catalyst includes at least one of tin oxide, stannous oxide and stannous oxalate.

5. The quenching oil composition according to claim 1, characterized in that The refrigeration accelerator is polyisobutylene.

6. The quenching oil composition according to claim 5, characterized in that The average molecular weight of polyisobutylene is ≥1000.

7. The quenching oil composition according to claim 1, characterized in that The antioxidant is at least one of 2,6-di-tert-butyl-p-cresol, 2,6-di-tert-butylphenol, 3,5-di-tert-butyl-4-hydroxyphenyl propionate, octyl / butyl diphenylamine and liquid high molecular weight phenol antioxidant.

8. The quenching oil composition according to claim 1, characterized in that The demulsifier includes an amine and at least one of an epoxy compound and a polyether compound.

9. A method for preparing a quenching oil composition according to any one of claims 1 to 8, characterized in that: The following steps are involved: The catalytic agent, the antioxidant and the demulsifier are added to the synthetic ester base oil, mixed, and vacuum dehydration is performed. The vacuum degree of the vacuum dehydration is 0.25Mpa-0.35Mpa. The vacuum dehydration is stopped when the water content is ≤300ppm to obtain the quenching oil composition.

10. The method for preparing the quenching oil composition according to claim 9, characterized in that: The preparation method of the synthetic ester base oil comprises the following steps: The neopentyl polyol, the fatty acid and the catalyst are mixed, wherein the fatty acid is in excess of 20%-30% by mole, and the temperature is raised to a first temperature of 160° C.-180° C., and the temperature is kept for 2 h-3 h. The temperature is further raised to a second temperature of 230° C.-240° C., and the temperature is kept until the acid value of the sample is ≤3 mg KOH / g, thereby obtaining a reactant A; The reactant A is cooled to 190° C.-210° C. and distilled under reduced pressure at a vacuum degree of 0.5 MPa. The distillation is stopped when the acid value of the sample is ≤1.0 mg KOH / g to obtain a reactant B; The reactant B is cooled to a third temperature of 80° C. to 90° C., and while maintaining the third temperature, the impurity removal treatment is performed several times until the acid value of the sample is ≤0.2 mg KOH / g, thereby obtaining the synthetic ester base oil; The impurity removal process includes: adding a NaOH solution with a mass concentration of 10%, the amount of the NaOH solution added is 10% of the mass of the synthetic raw material, mixing, standing and stratifying, removing the lower layer of liquid, then adding water with a mass concentration of 10% of the synthetic raw material, mixing, standing and stratifying, and removing the lower layer of liquid.

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