Energy-saving screw compressor oil and preparation method thereof

Abstract

The invention provides energy-saving screw compressor oil. The energy-saving screw compressor oil is prepared from the following raw materials in percentage by mass: 2-15% of a viscosity index improver; 0.2 to 2% of an antioxidant; 0.2-2% of an anti-wear agent; 0.1-1% of a friction reducing agent, the friction reducing agent being an organic sulfur oligomer, and the balance being base oil. The invention also provides a preparation method of the energy-saving screw compressor oil. The screw compressor oil disclosed by the invention is suitable in viscosity grade, excellent in viscosity index and excellent in antifriction effect, the efficiency of a compressor is improved, and the energy loss is reduced.

Description

Technical Field

[0001] The present invention belongs to the field of lubricating oils and relates to an energy-saving screw compressor oil and a preparation method thereof. Background Art

[0002] As an efficient and reliable compression device, screw compressors are widely used in industrial production, refrigeration and air conditioning, and other fields. Screw compressor oil, as an important part of screw compressors, directly affects the efficiency, reliability, and service life of compressors.

[0003] Traditional screw compressor oils are mainly made of mineral oils or synthetic hydrocarbons as base oils, and additives such as antioxidants, anti-wear agents, and rust inhibitors are added. However, traditional screw compressor oils have the following problems:

[0004] 1. High viscosity at room temperature: High viscosity at room temperature results in high resistance when starting the equipment, increasing energy consumption;

[0005] 2. Low viscosity index: The viscosity drops rapidly at high temperatures, resulting in a decline in lubrication performance and increased mechanical wear; low high-temperature viscosity also leads to poor sealing performance of the compressor, causing air leakage and low compression efficiency;

[0006] 3. Poor anti-friction effect: Traditional lubricating oils do not use effective anti-friction agents, resulting in a high friction coefficient;

[0007] 4. Limited energy-saving effect: The large viscosity of the oil, high friction coefficient, and poor sealing performance lead to large energy losses.

[0008] To solve the above problems, the present invention provides an energy-saving screw compressor oil and a preparation method thereof. Summary of the Invention

[0009] In view of the above technical problems in the prior art, the present invention provides an energy-saving screw compressor oil and a preparation method thereof. The energy-saving screw compressor oil and the preparation method thereof are to solve the technical problems of high friction coefficient, poor sealing performance, and high energy consumption of screw compressor oil in the prior art.

[0010] The present invention provides an energy-saving screw compressor oil, which is prepared from the following raw materials in mass percentages:

[0011] Viscosity index improver: 2-15%;

[0012] Antioxidant: 0.2-2%;

[0013] Anti-wear agent: 0.2-2%;

[0014] Friction reducer: 0.1-1%;

[0015] Base oil: the balance.

[0016] Further, the base oil is any one or a combination of two or more of type II petroleum-based base oil, natural gas liquefied base oil (GTL oil), polyalphaolefin (PAO), ester oil, or polyether.

[0017] Further, the viscosity index improver is polymethacrylate (PMMA) or hydrogenated styrene-isoprene copolymer (HSD). The weight-average molecular weight of the viscosity index improver is 20,000 - 100,000, and the dispersity index PDI is 1.5 - 2.5.

[0018] Further, the antioxidant is any one or a combination of two or more of phenolic antioxidants, amine antioxidants, or thioester antioxidants.

[0019] Further, the antiwear agent is any one or a combination of two or more of zinc dialkyldithiophosphate (ZDDP), dialkyldithiocarbamate, sulfur-phosphorus nitrogen-containing derivatives, or dimethylamine disulfide.

[0020] Further, the friction reducer is an organic sulfur oligomer.

[0021] Further, the preparation method of the organic sulfur oligomer is as follows:

[0022] Step 1): Add sulfur, an alkali metal or alkaline earth metal salt catalyst, and a solvent of dimethylformamide (NMP) or hexamethylphosphoric triamide (HMPA) into a reaction vessel in proportion. Nitrogen is introduced into the reaction vessel, and the reaction vessel is equipped with a reflux condenser. Stir and react at 95 - 105 °C for 0.5 - 3 h;

[0023] Step 2): In the reaction vessel after the reaction in Step 1) is completed, add water and 1,4-dichlorobenzene, and raise the temperature to 150 - 250 °C for polymerization reaction for 1 - 10 hours;

[0024] Step 3): After the polymerization is completed, cool it to 95 - 105 °C, wash it with distilled water at 70 - 85 °C at least twice until the color of the product no longer changes, and put it into an oven for drying to obtain the organic sulfur oligomer friction reducer.

[0025] Further, in Step 1), the cation of the alkali metal or alkaline earth metal salt catalyst is one or a combination of two or more of lithium, sodium, potassium, rubidium, calcium, magnesium, and strontium, and the anion of the alkali metal or alkaline earth metal salt catalyst is one or a combination of two or more of halogen, carbonic acid, phosphoric acid, 6-aminocaproic acid, and hydrosulfuric acid. The alkali metal or alkaline earth metal salt catalyst is preferably a single-component or two-component catalyst of sodium carbonate, sodium sulfide, sodium 6-aminocaproate, or sodium phosphate.

[0026] Further, in the step 1), the molar ratio of the alkali metal or alkaline earth metal salt catalyst to sulfur is 0.01-0.1, and the material ratio of the solvent to sulfur is 200-1000 mL: 1 mol.

[0027] Further, in the step 2), the material ratio of the added water to sulfur is 0.1-10 mL: 1 mol.

[0028] The material ratio of the amount of 1,4-dichlorobenzene used to sulfur is 0.7-1.3 mol: 1 mol.

[0029] Further, the energy-saving screw compressor oil also contains a rust inhibitor. In the energy-saving screw compressor oil, the mass percentage concentration of the rust inhibitor is 0.1-1%, and the rust inhibitor is preferably a metal sulfonate or a metal naphthenate.

[0030] Further, the energy-saving screw compressor oil also contains an antifoaming agent. In the energy-saving screw compressor oil, the mass percentage concentration of the antifoaming agent is: 0.01-0.1%, and the antifoaming agent is preferably a copolymer of acrylate and butyl ether.

[0031] Further, the energy-saving screw compressor oil also contains a demulsifier. In the energy-saving screw compressor oil, the mass percentage concentration of the demulsifier is: 0.01-0.1%, and the demulsifier is preferably an ethylene glycol-propylene glycol copolymer initiated with an amine or an alcohol.

[0032] The present invention also provides a method for preparing an energy-saving screw compressor oil, comprising the following steps:

[0033] 1) Weigh each reaction raw material according to the mass percentage;

[0034] 2) Heat the base oil to 60-80 °C, add a viscosity index improver, and stir until completely dissolved;

[0035] 3) Add an antioxidant, an antiwear agent, a friction reducer, a rust inhibitor, and a demulsifier, and continue to stir until uniform;

[0036] 4) Add an antifoaming agent, cool the mixture to room temperature, and filter to obtain the energy-saving screw compressor oil.

[0037] The energy-saving screw compressor oil provided by the present invention has the following advantages:

[0038] 1. Suitable viscosity grade: A slightly lower normal temperature viscosity ensures the starting performance required when the equipment is started, and reduces the energy consumption in the initial stage of equipment operation;

[0039] 2. Excellent viscosity index: Ensure appropriate viscosity at high temperatures, maintain the oil film thickness required for fluid lubrication, and effectively reduce mechanical wear. At the same time, the appropriate high-temperature viscosity enables the compressor to have good sealing performance, reduce air leakage, and improve gas compression efficiency; thereby reducing the energy consumption of compressor oil.

[0040] 3. Excellent anti-friction effect: Adopt innovative anti-friction additives to significantly reduce the friction coefficient;

[0041] 4. Significant energy-saving effect: Improve compressor efficiency and reduce energy loss. Specific implementation manners

[0042] The present invention will be further described below in conjunction with embodiments, but the present invention is not limited to the following embodiments.

[0043] Embodiment 1

[0044] (1) Load 9.6 grams of sulfur, 0.3 grams of sodium phosphate, and 150 milliliters of the solvent hexamethylphosphoramide into a three-necked flask, install a reflux condenser, introduce nitrogen, and stir and react at 100 °C for 1 h.

[0045] (2) Add 0.5 milliliters of water and 38.5 grams of 1,4-dichlorobenzene, and raise the temperature to 190 °C for polymerization reaction for 3 hours.

[0046] (3) After the polymerization is completed, cool it to 100 °C, wash it several times with distilled water at 80 °C until the color of the product no longer changes, and dry it in an oven at 120 °C to obtain the organic sulfur oligomer anti-friction agent product 1. The solubility of the organic sulfur oligomer anti-friction agent product 1 is shown in Table 1.

[0047]

[0048] The molecular weight of the product cannot be measured by GPC, so it is less than 1000, and it is inferred that n is between 5 and 10.

[0049] Comparative example 1

[0050] (1) Load 9.6 grams of sulfur, 0.2 grams of lithium chloride, 0.3 grams of sodium phosphate, and 150 milliliters of the solvent hexamethylphosphoramide into a three-necked flask, install a reflux condenser, introduce nitrogen, and stir and react at 100 °C for 1 h.

[0051] (2) Add 0.5 milliliters of water and 38.5 grams of 1,4-dichlorobenzene, and raise the temperature to 230 °C for polymerization reaction for 6 hours.

[0052] (3) After the polymerization is completed, cool it to 100 °C, wash it several times with distilled water at 80 °C until the color of the product no longer changes, and dry it in an oven at 120 °C to obtain the comparative example product 2. The solubility of the comparative example product 2 is shown in Table 1.

[0053] Table 1 Dissolution properties of organic sulfur oligomer friction reducers

[0054]

[0055]

[0056] From the data in Table 1, it can be seen that the organic sulfur oligomer friction reducer synthesized under the conditions of the present invention can be dissolved in non-polar solvents. The solubility of Product 2 synthesized after changing the synthesis conditions in non-polar solvents is very small, which does not meet the performance requirements of compressor oil additives. This is due to the too large molecular weight of Product 2.

[0057] Example 2

[0058] 502.7 g of natural gas liquefied oil (GTL oil) GTL420 (from Shell, model GTL420), 225 g of GTL430 (natural gas liquefied oil, from Shell, model GTL430), 200 g of PAO6 (polyalphaolefin), 50 g of polymethacrylate viscosity index improver, 2 g of the organic sulfur oligomer friction reducer product 1 of Example 1, 6 g of high molecular phenolic antioxidant, 6 g of butyloctyl phenylenediamine, 6 g of dialkyldithiocarbamate, 2 g of calcium petroleum sulfonate, 0.2 g of polyether demulsifier, 0.1 g of high molecular non-silicon defoamer, and the preparation is carried out according to the following steps:

[0059] 1. Heat the base oil to 7°C, add the viscosity index improver, and stir until completely dissolved;

[0060] 2. Add the antioxidant, antiwear agent, friction reducer, rust inhibitor, and demulsifier, and continue to stir until homogeneous;

[0061] 3. Add the defoamer, cool the mixed oil to room temperature, and filter to obtain the energy-saving screw compressor oil.

[0062] Example 3

[0063] 747.7 g of natural gas liquefied oil (GTL oil) GTL420, 200 g of PAO6 (polyalphaolefin), 30 g of polymethacrylate viscosity index improver, 2 g of the organic sulfur oligomer friction reducer product 1 of Example 1, 6 g of high molecular phenolic antioxidant, 6 g of butyloctyl phenylenediamine, 6 g of dialkyldithiocarbamate, 2 g of calcium petroleum sulfonate, 0.2 g of polyether demulsifier, 0.1 g of high molecular non-silicon defoamer, and the preparation is carried out according to the following steps:

[0064] 1. Heat the base oil to 70°C, add the viscosity index improver, and stir until completely dissolved;

[0065] 2. Add the antioxidant, antiwear agent, friction reducer, rust inhibitor, and demulsifier, and continue to stir until homogeneous;

[0066] 3. Add an antifoaming agent, cool the mixed oil to room temperature, and filter to obtain the energy-saving screw compressor oil.

[0067] Comparative Example 2

[0068] 405.7 g of natural gas liquefied oil (GTL oil) GTL430, 172 g of 46# Group II base oil, 400 g of PAO8 (polyalphaolefin), 6 g of high molecular phenolic antioxidant, 6 g of butyloctyl phenylenediamine, 6 g of dialkyldithiocarbamate, 2 g of organic molybdenum antiwear agent, 2 g of calcium petroleum sulfonate, 0.2 g of polyether demulsifier, and 0.1 g of high molecular non-silicon antifoaming agent are prepared according to the following steps:

[0069] 1. Heat the base oil to 70 °C and stir until completely dissolved;

[0070] 2. Add the antioxidant, antiwear agent, anti-friction agent, rust inhibitor, and demulsifier, and continue stirring until homogeneous;

[0071] 3. Add an antifoaming agent, cool the mixed oil to room temperature, and filter to obtain the screw compressor oil.

[0072] Comparative Example 3

[0073] 289.7 g of natural gas liquefied oil (GTL oil) GTL420, 490 g of natural gas liquefied oil (GTL oil) GTL430, 198 g of PAO6, 6 g of high molecular phenolic antioxidant, 6 g of butyloctyl phenylenediamine, 6 g of dialkyldithiocarbamate, 2 g of organic molybdenum antiwear agent, 2 g of calcium petroleum sulfonate, 0.2 g of polyether demulsifier, and 0.1 g of high molecular non-silicon antifoaming agent are prepared according to the following steps:

[0074] 1. Heat the base oil to 70 °C and stir until completely dissolved;

[0075] 2. Add the antioxidant, antiwear agent, anti-friction agent, rust inhibitor, and demulsifier, and continue stirring until homogeneous;

[0076] 3. Add an antifoaming agent, cool the mixed oil to room temperature, and filter to obtain the screw compressor oil.

[0077] According to GB / T265-1988, the kinematic viscosity tests of the products of the examples and comparative examples are carried out at 40 °C and 100 °C.

[0078] According to GB / T1995-1998, the viscosity index tests of the products of the examples and comparative examples are carried out.

[0079] According to GB / T3535-2006, the pour point tests of the products of the examples and comparative examples are carried out.

[0080] According to GB / T7305-2003, the products of the examples and comparative examples were tested for demulsification time at 54 °C.

[0081] According to GB / T12579-2002, the products of the examples and comparative examples were tested for foam performance.

[0082] According to SH / T0193-2022, the products of the examples and comparative examples were tested for rotary oxygen bomb at 150 °C.

[0083] According to GB / T5096-2017, the products of the examples and comparative examples were tested for corrosion level by corroding copper sheets at 100 °C for 3 h.

[0084] According to SH / T0762-2005, a four-ball friction and wear tester was used to test the friction coefficients of the products of the examples and comparative examples. The steel ball material used was GCr15 with a diameter of 12.7 mm. After the oil temperature reached the test temperature, the motor was started to drive the main shaft to rotate at a speed of 600 r / min for 10 min. The test was divided into ten levels. Starting from 98.1 N, the load was increased by 98.1 N every 10 min, and the maximum load was 981 N. When the friction torque suddenly increased, the test was stopped. The friction coefficient was calculated using the load at this time.

[0085] Table 2 Performance test results of examples and comparative examples

[0086]

[0087] As can be seen from the data in Table 2 above, both the organic sulfur friction reducer and the organic molybdenum friction reducer can reduce the friction coefficient of the oil product. However, the organic molybdenum friction reducer has a negative impact on the oxidation stability of the oil product. This will reduce the service life of the oil product, generate deposits in the later stage of oil use, increase the mechanical running resistance, and increase energy consumption.

[0088] The energy-saving screw compressor oil of the present invention has obvious advantages in the following aspects: The present invention discloses an energy-saving screw compressor oil and its preparation method. The compressor oil is composed of a base oil, a viscosity index improver, an antioxidant, an anti-wear agent, a rust inhibitor, and an antifoaming agent. The energy-saving screw compressor oil provided by the present invention has excellent viscosity index, antioxidant performance, and energy-saving effect, and can effectively extend the service life of the screw compressor and reduce energy consumption. The energy-saving screw compressor oil of the present invention overcomes the adverse effects of ash-containing friction reducers on oxidation performance.

[0089] In addition, the compressor oils prepared in Example 2 and Example 3 of the present invention were applied to a screw air compressor equipment for actual operation to test the energy-saving effect. When evaluating the energy-saving effect, the air compressor models with powers of 45 kW and 75 kW were used, and the energy-saving effects were compared with those of Comparative Example 2 and Comparative Example 3.

[0090] The energy-saving screw compressor oil described in the present invention has excellent energy-saving effects. Through the actual operation test of the compressor, compared with the comparative example, the power consumption of the energy-saving screw compressor oil described in the present invention is reduced by 4-6%. Moreover, the oil described in the present invention has an extremely long service life, with an oil change period exceeding 5000 hours; it has stable performance, excellent high-temperature oxidation resistance, can effectively inhibit the generation of harmful deposits such as sludge, paint film, and gum, maintain the cleanliness of the equipment, has good extreme pressure and anti-wear capabilities, and strong rust and corrosion prevention capabilities; the oil consumption is less, carbon emissions are reduced, and it is energy-saving and environmentally friendly.

[0091] Taking a medium-pressure screw compressor with a power of 75kW as an example, when operating at full load, 75kW means consuming 75 degrees of electricity per hour. The power consumption for running one day is 75 degrees * 24 hours, which is equal to 1800 degrees. The power consumption for one year (average 300 days) is 540,000 degrees. Calculated at 1 yuan per degree of electricity, the annual electricity cost for a screw air compressor with a power of 75kW operating at full load is 540,000 yuan. Using the energy-saving screw compressor oil described in the present invention can save 4%-6% of electricity per year, that is, the annual electricity cost savings is 21,600 yuan - 32,400 yuan.

Claims

1. An energy-saving screw compressor oil, characterized in that: It is prepared from the following raw materials in percentage by weight: Viscosity index improver: 2-15%; Antioxidant: 0.2-2%; Antiwear agent: 0.2-2%; Friction reducer: 0.1-1%; Base oil: Balance.

2. The energy-saving screw compressor oil according to claim 1, characterized in that: The base oil is any one of Class II petroleum-based base oil, natural gas liquefaction base oil, poly-α-olefin, ester oil or polyether, or a combination of two or more thereof; the viscosity index improver is polymethacrylate or hydrogenated styrene-isoprene copolymer, the weight average molecular weight of the viscosity index improver is 20,000-100,000, and the dispersion index PDI is 1.5-2.5; the antioxidant is any one of phenolic antioxidant, amine antioxidant or thioester antioxidant, or a combination of two or more thereof; the anti-wear agent is any one of dialkyl zinc dithiophosphate, dialkyl dithiocarbamate, sulfur-phosphorus nitrogen-containing derivatives, dimethylamine disulfide, or a combination of two or more thereof; and the friction reducer is an organic sulfur oligomer.

3. An energy-saving screw compressor oil according to claim 2, characterized in that: The preparation method of the organic sulfur oligomer is: Step 1): sulfur, alkali metal or alkaline earth metal salt catalyst, and solvent dimethylformamide or hexamethylphosphoric acid triamide are added in proportion to a reaction container, nitrogen is introduced into the reaction container, and the reaction container is provided with a reflux condenser, and the reaction is stirred at 95-105° C. for 0.5-3 hours; Step 2): After the reaction in step 1), water and 1,4-dichlorobenzene are added to the reaction vessel and the temperature is raised to 150-250° C. for polymerization reaction for 1-10 hours; Step 3): After the polymerization is completed, the product is cooled to 95-105° C., washed with 70-85° C. distilled water at least twice until the product color no longer changes, and then placed in an oven for drying to obtain an organic sulfur oligomer friction reducer.

4. The energy-saving screw compressor oil according to claim 3, characterized in that: In the step 1), the cation of the alkali metal or alkaline earth metal salt catalyst is one or a combination of two or more of lithium, sodium, potassium, rubidium, calcium, magnesium, and strontium, and the anion of the alkali metal or alkaline earth metal salt catalyst is one or a combination of two or more of halogen, carbonic acid, phosphoric acid, aminocaproic acid, and hydrosulfuric acid; in the step 1), the molar ratio of the alkali metal or alkaline earth metal salt catalyst to sulfur is 0.01-0.1, and the material ratio of the solvent to sulfur is 200-1000mL:1mol; in the step 2), the material ratio of the amount of water added to sulfur is 0.1-10mL:1mol, and the material ratio of the amount of 1,4-dichlorobenzene used to sulfur is 0.7-1.3mol:1mol.

5. The energy-saving screw compressor oil according to claim 3, characterized in that: The alkali metal or alkaline earth metal salt catalyst is a single-component or two-component catalyst of sodium carbonate, sodium sulfide, sodium aminocaproate, or sodium phosphate.

6. The energy-saving screw compressor oil according to claim 1, characterized in that: The energy-saving screw compressor oil also contains a rust inhibitor. In the energy-saving screw compressor oil, the mass percentage concentration of the rust inhibitor is 0.1-1%, and the rust inhibitor is a sulfonic acid metal salt or a cyclopentane acid metal salt.

7. The energy-saving screw compressor oil according to claim 1, characterized in that: The energy-saving screw compressor oil also contains a defoamer. In the energy-saving screw compressor oil, the mass percentage concentration of the defoamer is 0.01-0.1%, and the defoamer is a copolymer of acrylate and butyl ether.

8. The energy-saving screw compressor oil according to claim 1, characterized in that: The energy-saving screw compressor oil also contains a demulsifier. In the energy-saving screw compressor oil, the mass percentage concentration of the demulsifier is 0.01-0.1%, and the demulsifier is an ethylene glycol-propylene glycol copolymer with amine or alcohol as an initiator.

9. The method for preparing an energy-saving screw compressor oil according to claim 1, characterized in that: The following steps are involved: 1) Weigh each reaction raw material according to mass percentage; 2) Heat the base oil to 60-80°C, add the viscosity index improver, and stir until it is completely dissolved; 3) Add antioxidant, anti-wear agent, friction reducer, rust inhibitor, demulsifier, and continue stirring until uniform; 4) Add a defoaming agent, cool the mixture to room temperature, and filter to obtain energy-saving screw compressor oil.

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