Long-service-life high-efficiency dynamic equilibrium air compressor oil and preparation method thereof

Abstract

The invention relates to the field of engine oil, in particular to long-life high-efficiency dynamic equilibrium air compressor oil and a preparation method thereof. The invention relates to long-life high-efficiency dynamic equilibrium air compressor oil, which is prepared from the following raw materials in parts by mass: 90 to 120 parts of base oil system, 1 to 2 parts of antioxidant, 2 to 6 parts of extreme pressure anti-wear agent, 0.3 to 0.6 part of metal deactivator, 0.5 to 1.5 parts of anti-rusting agent, 0.2 to 0.3 part of defoaming agent, 0.5 to 1.2 parts of purification dispersant and 3 to 8 parts of functional auxiliary agent. The finally prepared air compressor oil not only has the effects of long service life, high energy efficiency and the like, but also can keep comprehensive properties such as oxidation resistance, detergency and anti-foaming property at the same time so as to meet the increasing application requirements of air compressors.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of engine oil, more particularly to a long-life high-efficiency dynamic balance air compressor oil and a preparation method thereof. BACKGROUND

[0002] In modern industrial production, air compressors are widely used in mechanical manufacturing, chemical industry, metallurgy, power, textile, food and medicine, etc. as key power equipment. The running efficiency and reliability of air compressors are directly related to the stability and energy consumption level of the entire production system. As the core medium of the lubrication system of air compressors, air compressor oil not only bears the basic function of lubricating moving parts and reducing friction and wear, but also needs to have good oxidation resistance, thermal stability, emulsion resistance, rust and corrosion resistance, and excellent air release and foam control performance.

[0003] With the deepening of the concept of energy saving and green manufacturing, higher standards for the service life and energy efficiency of air compressor oil have been put forward in recent years. Although traditional mineral base oil formulated air compressor oil has low cost, it is prone to problems such as viscosity increase, acid value increase, carbon deposition and coking in high temperature oxidation environment, resulting in short oil change cycle and frequent equipment maintenance, which is difficult to meet the needs of modern high-efficiency compressor continuous long-period operation. In order to improve this situation, the industry gradually uses hydrocracking base oil and even synthetic base oil as carriers, and compounds various high-performance additives, including phenolic amine complex antioxidants, metal passivators, detergent dispersants, anti-wear extreme pressure agents and defoamers, to improve the overall performance of the oil.

[0004] However, although the existing technology has made certain progress in the selection of base oil and the formulation of additives, it still exposes some technical bottlenecks in actual application. First, most of the commercially available air compressor oils still cannot effectively inhibit the formation of oil sludge and paint film under long-term high temperature and high humidity conditions, especially under the condition of frequent changes in dynamic load, the internal components of the oil are prone to uneven distribution, resulting in local lubrication failure; second, the existing additive system often focuses on the optimization of a single performance indicator, lacking a systematic design of the overall dynamic balance of the oil, for example, there is often a mutual restraint relationship between oxidation resistance and air release, and between detergency and anti-foaming, which is difficult to balance; third, although some synthetic oils have excellent thermal stability, they have poor compatibility with sealing materials, or insufficient flowability at low temperature start-up, limiting their applicability in a wide temperature range. SUMMARY

[0005] To sum up, how to develop an air compressor oil with long service life, high energy efficiency and high performance balance under complex dynamic conditions has become a key problem to be solved in the field of lubrication technology. Through in-depth research in this technical direction, the applicant finally proposes a long-life high-efficiency dynamic balance air compressor oil and its preparation method. The air compressor oil finally prepared not only has the effects of long service life and high energy efficiency, but also can maintain comprehensive performance such as oxidation resistance, detergency and foam resistance at the same time to meet the growing application demand of air compressors.

[0006] A long-life high-efficiency dynamic balance air compressor oil, by mass, the raw materials include: a base oil system 90-120 parts, an antioxidant 1-2 parts, an extreme pressure wear-resistant agent 2-6 parts, a metal passivator 0.3-0.6 parts, an anti-rust agent 0.5-1.5 parts, a defoaming agent 0.2-0.3 parts, a cleaning and dispersing agent 0.5-1.2 parts, and a functional auxiliary agent 3-8 parts.

[0007] Preferably, the mass ratio of the base oil system, the extreme pressure wear-resistant agent and the functional auxiliary agent is (9.5-11):(0.3-0.5):(0.4-0.7).

[0008] Preferably, the mass ratio of the base oil system, the extreme pressure wear-resistant agent and the functional auxiliary agent is (10-10.5):(0.4-0.5):(0.5-0.6).

[0009] Preferably, the base oil system is a combination of poly-alpha-olefin, alkyl naphthalene and double ester.

[0010] Preferably, the mass ratio of the poly-alpha-olefin, the alkyl naphthalene and the double ester is (6-8):(1-2):(0.8-1.2).

[0011] Preferably, the mass ratio of the poly-alpha-olefin, the alkyl naphthalene and the double ester is (7-8):(1.5-2):(0.9-1).

[0012] Preferably, the double ester is at least one of diisooctyl sebacate, diisononyl adipate, glutaric acid mixed ester and diisooctyl azelate.

[0013] Preferably, the double ester is diisooctyl sebacate or diisononyl adipate.

[0014] Preferably, the double ester is diisooctyl sebacate.

[0015] The base oil system of the present application is composed of poly-alpha olefin, alkyl naphthalene and double ester, which builds an inherently stable and efficient lubricating carrier. Firstly, the regular molecular structure provides excellent oxidation stability and thermal stability skeleton, which can effectively resist the molecular chain rupture and aging deterioration caused by oxygen and metal catalysis in high temperature and high pressure compression environment; secondly, the unique aromatic ring structure acts as a natural solvent, effectively suspending and removing the initial generated oil sludge and polar substances, and maintaining the internal cleanliness of the oil together with poly-alpha olefin; finally, the introduction of double ester, with its strong polar molecular characteristics, firmly adsorbs on the surface of metal parts, forming a tough lubricating film, directly making up for the possible deficiency of synthetic hydrocarbon oil in boundary lubrication conditions, significantly improving the anti-wear performance and reducing the friction energy consumption. The three complement each other, and finally achieve a high-performance air compressor oil which performs outstandingly in durability, cleanliness and energy efficiency.

[0016] Preferably, the antioxidant is a combination of hindered phenol and alkylated diphenylamine.

[0017] Preferably, the mass ratio of the hindered phenol and alkylated diphenylamine is (2-3):1.

[0018] Preferably, the hindered phenol is Irganox L135.

[0019] Preferably, the extreme pressure and wear resistant agent is a combination of thiophosphate and organic molybdenum complex.

[0020] Preferably, the mass ratio of the thiophosphate and organic molybdenum complex is (3-4):(1-1.5).

[0021] Preferably, the mass ratio of the thiophosphate and organic molybdenum complex is (3.5-4):(1-1.2).

[0022] Preferably, the metal passivator is toluene triazole or substituted benzene triazole.

[0023] Preferably, the metal passivator is toluene triazole.

[0024] Preferably, the anti-rust agent is neutral calcium sulfonate or succinic acid half ester.

[0025] Preferably, the anti-rust agent is succinic acid half ester.

[0026] Preferably, the defoaming agent is at least one of organosilicon defoaming agents.

[0027] Preferably, the detergent dispersant is any one of polyether amine, succinimide or polyisobutylene succinate.

[0028] Preferably, the detergent dispersant is polyether amine or succinimide.

[0029] Preferably, the functional auxiliary agent is a combination of borated phosphate ester and polyisobutylene succinimide.

[0030] Preferably, the mass ratio of the borated phosphate ester and polyisobutylene succinimide is (2~4):(0.8~1.2).

[0031] Preferably, the mass ratio of the borated phosphate ester and polyisobutylene succinimide is (2.5~3):(1~1.1).

[0032] The functional auxiliary agent added in the present application forms a comprehensive ability strengthening for the base oil system. As a high-efficiency cleaning factor, polyisobutylene succinimide can effectively disperse and wrap the paint film and carbon precursor generated by the oxidation of oil at high temperature in the first place, thereby keeping the metal surface inside the engine clean. At the same time, the phosphorus component carried by the borated phosphate ester molecule can form a buffer layer on the metal surface under extreme pressure conditions, providing basic anti-wear protection. The more creative boron component is activated at higher working temperatures and reacts with the metal surface to form a tough borate protective film with self-repairing tendency. This film not only resists high temperature well, but also significantly reduces the friction coefficient. Ultimately, the combination of the two gives the oil product an anti-oxidation damage ability beyond the conventional, reduces energy loss caused by friction, and significantly improves the overall stability and service life under harsh working conditions.

[0033] A preparation method of a long-life high-efficiency dynamic balance air compressor oil, comprising the following steps: S1: pumping the base oil system into a clean and dry stainless steel reaction kettle according to the proportion, stirring at 30~50 rpm and 60~65℃, maintaining the vacuum degree in the kettle at -0.095 MPa for continuous dehydration and degassing for 50~60 min after stabilization; S2: adding antioxidants and metal deactivators, heating to 70~75℃, stirring at 60~80 rpm for 70~90 min, then adding the remaining raw materials in turn, and continuously stirring at 60~70 rpm for 100~120 min after all the addition is completed, to fully dissolve and pre-disperse; S3: stabilizing and defoaming at 35~40℃ for 25~30 min, and then circulating filtering the oil in the reaction kettle through a plate and frame precision filter until the oil product is clear and transparent, to obtain the product.

[0034] The present application has the following beneficial effects:

[0035] 1、The air compressor oil finally prepared in the present application not only has the effects of long service life and high energy efficiency, but also can simultaneously maintain comprehensive performances such as oxidation resistance, detergency and anti-foaming property, to meet the increasing application demand of air compressors.

[0036] 2, The base oil system of the application is composed of poly-alpha-olefin, alkyl naphthalene and double ester, which builds an internally stable and efficient lubricating carrier. Especially the introduction of double ester, with its strong polar molecular characteristics, firmly adsorbs on the surface of metal parts to form a tough lubricating film, directly making up for the possible deficiency of synthetic hydrocarbon oil in boundary lubrication conditions, significantly improving the anti-wear performance and reducing the energy consumption of friction. The three complement each other, and finally achieve a high-performance air compressor oil that performs outstandingly in durability, cleanliness and energy efficiency.

[0037] 3, The functional auxiliary agent added in the application forms a comprehensive ability strengthening for the base oil system. Borated phosphate ester and polyisobutylene succinimide form a buffer layer on the metal surface under extreme pressure conditions, providing basic anti-wear protection; and the more creative boron component is activated at higher working temperature, reacts with the metal surface to form a tough and self-repairing borate protective film. This film not only resists high temperature well, but also significantly reduces the friction coefficient. Finally, the two together endow the oil with superior anti-oxidation damage ability, reduce energy loss caused by friction, and significantly improve the overall stability and service life under harsh working conditions. BRIEF DESCRIPTION OF DRAWINGS

[0038] Figure 1 It is the physical picture of the long-life high-performance dynamic balance air compressor oil prepared in Example 1.

[0039] Figure 2 It is the comparison chart of the storage test results of the stability of the oil of Example 1, Comparative Example 3, Comparative Example 1 and Comparative Example 2.

[0040] Figure 3 It is the comparison chart of the hanging wall test results of the stability of the oil of Example 1, Comparative Example 3, Comparative Example 1 and Comparative Example 2.

[0041] In the figure, a-Example 1, b-Comparative Example 3, c-Comparative Example 1, d-Comparative Example 2. DETAILED DESCRIPTION

[0042] Example 1

[0043] A long-life high-performance dynamic balance air compressor oil, by mass, the raw materials include: base oil system 100 parts, antioxidant 1.2 parts, extreme pressure anti-wear agent 5 parts, metal passivator 0.4 parts, anti-rust agent 0.8 parts, defoaming agent 0.2 parts, detergent dispersant 0.6 parts, functional auxiliary agent 5.5 parts.

[0044] The base oil system is a combination of poly-alpha-olefin, alkyl naphthalene and diester with a mass ratio of 7:2:1. The poly-alpha-olefin is specifically Durasyn® 166 from British Ineos; the alkyl naphthalene is specifically Synesstic 5 from American Exxon Mobil; and the diester is diisooctyl sebacate.

[0045] The antioxidant is a combination of hindered phenol Irganox L135 and alkylated diphenylamine with a mass ratio of 2:1.

[0046] The extreme pressure anti-wear agent is a combination of thiophosphate and organic molybdenum complex with a mass ratio of 3.8:1.2. The organic molybdenum complex is from Luoyang Pacific United Petroleum Chemical Industry.

[0047] The metal deactivator is toluene triazole; the anti-rust agent is succinic acid half ester; the silicone defoaming agent is BYK-066N; and the detergent dispersant is succinimide.

[0048] The functional auxiliary agent is a combination of borated phosphate and polyisobutylene succinimide with a mass ratio of 2.5:1. The polyisobutylene succinimide has a density of 0.82 g / m 3 , an alkaline value of 20 mgKOH / g, and is from Jiangsu Bosite Chemical Industry.

[0049] A preparation method of a long-life high-efficiency dynamic balance air compressor oil, comprising the following steps: S1: pumping the base oil system into a clean and dry stainless steel reaction kettle according to the proportion, stirring at 40 rpm and 65°C, maintaining the vacuum degree in the kettle at-0.095 MPa for continuous dehydration and degassing for 55 min after stabilization; S2: adding the antioxidant and the metal deactivator, heating to 75°C, and stirring at 70 rpm for 80 min, then sequentially adding the remaining raw materials, and continuously stirring at 65 rpm for 110 min at 65°C after all the addition is completed to fully dissolve and pre-disperse; S3: stabilizing and defoaming at 35°C for 25 min, and then circulating filtering the oil in the reaction kettle through a plate and frame precision filter until the oil appears clear and transparent, and the long-life high-efficiency dynamic balance air compressor oil is obtained.

[0050] The long-life high-efficiency dynamic balance air compressor oil prepared in this embodiment is shown in Figure 1 .

[0051] Example 2

[0052] This embodiment is different from Example 1 only in that a long-life high-efficiency dynamic balance air compressor oil, in mass parts, comprises the following raw materials: 110 parts of base oil system, 1.2 parts of antioxidant, 4 parts of extreme pressure anti-wear agent, 0.4 parts of metal deactivator, 0.8 parts of anti-rust agent, 0.2 parts of defoaming agent, 0.6 parts of detergent dispersant, and 6.5 parts of functional auxiliary agent.

[0053] The remaining embodiments are the same.

[0054] Example 3

[0055] The only difference between this example and Example 1 is that the long-life high-performance dynamic balance air compressor oil includes, by mass parts, base oil system 95 parts, antioxidant 1.2 parts, extreme pressure wear-resistant agent 3 parts, metal passivator 0.4 parts, anti-rust agent 0.8 parts, defoaming agent 0.2 parts, cleaning dispersant 0.6 parts, and functional auxiliary agent 4.5 parts.

[0056] The rest of the embodiments are the same.

[0057] Comparative Example 1

[0058] The only difference between this comparative example and Example 1 is that the long-life high-performance dynamic balance air compressor oil includes, by mass parts, base oil system 120 parts, antioxidant 1.2 parts, extreme pressure wear-resistant agent 6 parts, metal passivator 0.4 parts, anti-rust agent 0.8 parts, defoaming agent 0.2 parts, cleaning dispersant 0.6 parts, and functional auxiliary agent 1.5 parts.

[0059] The rest of the embodiments are the same.

[0060] Comparative Example 2

[0061] The only difference between this comparative example and Example 1 is that the long-life high-performance dynamic balance air compressor oil includes, by mass parts, base oil system 95 parts, antioxidant 1.2 parts, extreme pressure wear-resistant agent 4 parts, metal passivator 0.4 parts, anti-rust agent 0.8 parts, defoaming agent 0.2 parts, cleaning dispersant 0.6 parts, and functional auxiliary agent 14.5 parts.

[0062] The rest of the embodiments are the same.

[0063] Comparative Example 3

[0064] The only difference between this comparative example and Example 1 is that the base oil system is a combination of poly-alpha-olefin, alkyl naphthalene, and double ester, with a mass ratio of 9:0.8:0.2.

[0065] The functional auxiliary agent is only borated phosphate ester.

[0066] The antioxidant is only hindered phenol Irganox L135.

[0067] The rest of the embodiments are the same.

[0068] Comparative Example 4

[0069] The only difference between this comparative example and Example 1 is that the base oil system is a combination of poly-alpha-olefin, alkyl naphthalene, and double ester, with a mass ratio of 7:0.5:2.5.

[0070] The rest of the embodiments are the same.

[0071] Comparative Example 5

[0072] This comparative example differs from Example 1 only in that the functional adjuvant is a combination of borated phosphate ester and polyisobutylene succinimide in a mass ratio of 3.5:0.5.

[0073] The rest of the implementation is the same.

[0074] Comparative Example 6

[0075] This comparative example differs from Example 1 only in that the functional adjuvant is a combination of borated phosphate ester and polyisobutylene succinimide in a mass ratio of 0.5:1.5

[0076] The rest of the implementation is the same.

[0077] Performance test

[0078] 1. Oxidation stability: Test according to ASTM D943, place oil sample, water and copper-iron catalyst coil in a specially designed oxidation tube, continuously pass oxygen at a temperature of 95-100°C, test the time required for the acid value of the oil to reach 2.0 mg KOH / g, and record the results in Table 1.

[0079] 2. Application stability: According to ASTM D2070, immerse a piece of polished metal copper in the oil sample, and evaluate the discoloration of the test piece after 72h in a forced convection oven at 175°C, and record the results in Table 1.

[0080] 3. Wear protection: According to ASTM D4172, take the wear scar diameter (WSD), and record the average of 10 tests in Table 1.

[0081] 4. Anti-emulsification: Test according to ASTM D1401, mix 40ml of oil sample with 40ml of distilled water in a graduated cylinder at 54°C, and stir at a speed of 1500 rpm for 5 minutes. Then record the time required for the separation of oil, water and emulsion layer to 40-37-3ml, and record the results in Table 1.

[0082] 5. Air release value: Test according to ASTM D3427, pass compressed air into the oil sample at 50°C to fully atomize and entrain air, after stopping the aeration, record the time required for the volume of air entrained in the oil to reduce to 0.2%, and record the results in Table 1.

[0083] 6. Oil stability: the oil prepared from Example 1, Comparative Example 3, Comparative Example 1 and Comparative Example 2 was subjected to corresponding high-temperature stability storage test and wall hanging effect test after storage; the same transparent container was taken, 400 mL of final product oil sample was filled, sealed, and the sample was placed in a constant temperature test chamber at 80±2°C for continuous placement for 14 days, the sample was taken out and cooled to 25°C at room temperature, after cooling, the appearance was observed carefully whether there was obvious discoloration, impurities, layered oil droplet precipitation and suspended matter phenomenon, the results were recorded in Table 1, / represents not tested, and the results are shown in Figure 2 .

[0084] On the other hand, the oil samples after testing of Example 1 and Comparative Examples 1 and 2 were subjected to wall hanging test, and the wall hanging effect after testing was observed, and the results are shown in Figure 3 .

[0085] Table 1 Performance test results

[0086] Examples 1-3 in the present application achieved more excellent performance test results compared to Comparative Examples 1-6, which was mainly due to the fact that the base oil system was composed of poly-alpha-olefin, alkyl naphthalene and double ester, which built an inherently stable and efficient lubricating carrier, especially the introduction of double ester, which strongly adsorbed on the surface of metal parts with its strong polar molecular characteristics, forming a tough lubricating film, directly making up for the possible deficiency of oil film strength of synthetic hydrocarbon oil under boundary lubrication conditions, significantly improving the anti-wear performance and reducing the energy consumption of friction. In Comparative Examples 3 and 4, the defined technical scheme was not used, which greatly reduced the interaction effect, thereby leading to the decline of the comprehensive performance.

[0087] On the other hand, the borated phosphate added in the present application cooperates with polyisobutylene succinimide to form a buffer layer on the metal surface under extreme pressure conditions, providing basic anti-wear protection, and both of them give the oil product the ability to overcome conventional antioxidant damage, reduce energy loss caused by friction, and significantly improve the overall stability and service life under harsh working conditions. However, because of the change in the corresponding ratio, the mutual synergistic effect of Comparative Examples 5 and 6 was greatly weakened, which directly affected the final performance results.

[0088] According to the results shown in Figure 2 and Figure 3 , Comparative Example 3 showed obvious discoloration, and a large amount of deteriorated oil droplets appeared in the system, while Comparative Example 1 and Comparative Example 2 both showed layered precipitated oil droplets, and Comparative Example 2 also showed impurities, which indicated that long-term high-temperature storage caused irreversible quality damage to the oil products of Comparative Examples 1, 2 and 3.

[0089] On the other hand, the oil after the test, only Example 1 still has good wall-hanging effect, while Comparative Examples 1 and 2 cannot be observed obviously, only Example 1 still maintains excellent oil film strength and lubricity after the test, while Comparative Examples 1 and 2 are obviously deteriorated and affect the use effect.

Claims

1. A long-life, high-performance dynamic equalization air compressor oil, characterized by: The raw materials include, in mass parts: a base oil system 90-120 parts, an antioxidant 1-2 parts, an extreme pressure wear-resistant agent 2-6 parts, a metal passivator 0.3-0.6 parts, an anti-rust agent 0.5-1.5 parts, an antifoaming agent 0.2-0.3 parts, a detergent dispersant 0.5-1.2 parts, and a functional auxiliary agent 3-8 parts; The base oil system is a combination of poly-alpha-olefins, alkyl naphthalenes and diesters, with a mass ratio of (6-8):(1-2):(0.8-1.2); The diesters are at least one of diisooctyl sebacate, diisononyl adipate, mixed esters of glutaric acid and diisooctyl azelate.

2. The long life, high performance dynamic equalization air compressor oil of claim 1, wherein: The mass ratio of the base oil system, the extreme pressure wear-resistant agent and the functional auxiliary agent is (9.5-11):(0.3-0.5):(0.4-0.7).

3. The long life, high performance dynamic equalization air compressor oil of claim 2, wherein: The diesters are diisooctyl sebacate or diisononyl adipate.

4. The long life, high performance dynamic equalization air compressor oil of claim 3, wherein: The antioxidant is a combination of hindered phenols and alkylated diphenylamines, with a mass ratio of (2-3):

1.

5. The long life, high performance dynamic equalization air compressor oil of claim 4, wherein: The extreme pressure wear-resistant agent is a combination of thiophosphoric esters and organic molybdenum complexes, with a mass ratio of (3-4):(1-1.5).

6. The long life, high performance dynamic equalization air compressor oil of claim 5, wherein: The metal passivator is toluene triazole or substituted benzene triazole.

7. The long life, high performance dynamic equalization air compressor oil of claim 6, wherein: The anti-rust agent is neutral calcium sulfonate or succinic acid half ester.

8. The long life, high performance dynamic equalization air compressor oil of claim 7, wherein: The detergent dispersant is any one of polyether amines, succinimide or polyisobutylene succinic ester.

9. The long life, high performance dynamic equalization air compressor oil of claim 7, wherein: The functional auxiliary agent is a combination of borated phosphoric ester and polyisobutylene succinimide, with a mass ratio of (2-4):(0.8-1.2).

10. The method for preparing the long-life high-performance dynamic equalization air compressor oil according to claim 9, characterized in that: The method comprises the following steps: S1: Pump the base oil system into a clean and dry stainless steel reaction kettle according to the proportion, stir at 30-50 rpm and 60-65°C, maintain the vacuum degree in the kettle at -0.095 MPa for 50-60 min after stabilization for dehydration and degassing; S2: Add the antioxidant and the metal passivator, heat to 70-75°C, and stir at 60-80 rpm for 70-90 min, then add the remaining raw materials in sequence, and continuously stir at 60-70 rpm for 100-120 min after all the addition is completed, for sufficient dissolution and pre-dispersion; S3: Stabilize the defoaming at 35-40°C for 25-30 min, complete the reaction, and then filter the oil in the reaction kettle through a plate and frame precision filter machine until the oil is clear and transparent, and the product is obtained.

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