CN1982423B - Oil injection rotary air compressor lubricating oil and preparation method - Google Patents

Abstract

Rotary oil-jet air compressor lube oil and its production are disclosed. The formula consists of aromatic amine high-temperature antioxidant 0.1-0.6wt%, phenol antioxidant 0.1-1.0wt%, organic phosphate oil solution 0.1-0.6wt%, tinuvin fatty salt synergistic 0.01-0.1wt%, alkenyl ethylene dicarboxylic acid antirust agent VO.01-0.1wt% and base oil residue. It can be used at 100-200degree and has long antioxidant life.

Description

Oil injection rotary air compressor lubricating oil and preparation method

Technical field:

The invention relates to the technical field of lubricating oil for air compressors, in particular it is a lubricating oil for an oil-sprayed rotary type, that is, a sliding vane and screw type air compressor, and a preparation method thereof

Background technique:

The air compressor oil used in the past is maintained entirely by the anti-oxidation stability, anti-rust and lubricity of mineral oil itself.

In recent years, due to the development of compressor manufacturing technology, a compound formula of shielding phenolic antioxidant and zinc dialkyl dithiophosphate type high-temperature anti-oxidation, anti-corrosion, and anti-wear agent has been introduced into the new generation of compressor oil, thereby improving Improve the quality of air compressor oil. However, since the zinc dialkyldithiophosphate additive in this formula will decompose under long-term oxygen enrichment and high temperature conditions, and once the decomposition occurs, a chain reaction will be formed, resulting in deterioration of oil products and a sharp increase in deposits. As a result, the air compressor cannot work normally. This problem exists in some similar products of famous brands both at home and abroad. In particular, most of the lubricating oils used in oil-injected rotary (sliding vane and screw) air compressors are imported products, which are expensive, and the quality of domestic products manufactured with reference to foreign formulas still has a certain distance compared with foreign products. Chinese patent once disclosed the formula and the preparation method of several air compressor lubricating oils, discloses a kind of invention patent called "air compressor oil composition" as Chinese patent No. 92102699, but its formula and process and technical effect and this Inventions are not the same.

Invention content:

The object of the present invention is to provide a lubricating oil for an oil-sprayed rotary air compressor and a preparation method thereof. At the same time, the special additive for the lubricating oil and its preparation method are provided.

The present invention uses several kinds of additives to be added to the base oil in a certain proportion to make oil injection rotary (sliding vane and screw) air compressor oil. This compressor lubricating oil has excellent thermal oxidation stability, rust resistance, anti Emulsifying. At the same time, without changing the types of additives used, but only adjusting the proportion of the three main additives and adding them to different types of base oils, they can be made into light-duty (DAG), medium-duty (DAH) and heavy-duty (DAJ) respectively. Oil injection rotary (sliding vane and screw) air compressor oils with different performances can be used for lubrication and cooling of oil injection rotary (sliding vane and screw) air compressors that require different performance.

Light-duty oil-injected rotary (vane and screw) air compressor oil (DAG) is mainly used for oil-injected rotary (vane and screw) working under the conditions of exhaust and gas/oil temperature less than 90°C and exhaust pressure <800Kpa ) Lubrication and cooling of air compressors.

Medium-duty oil-injection rotary (sliding vane and screw) air compressor oil (DAH) is mainly used for exhaust and gas/oil temperature less than 100 ℃, exhaust pressure 800-1500Kpa; or exhaust and gas/oil temperature 100-110 Lubrication and cooling of oil-injected rotary (vane and screw) air compressors working under the condition of ℃, exhaust pressure <800Kpa.

Heavy-duty oil-injected rotary (sliding vane and screw) air compressor oil (DAJ) is mainly used for exhaust and gas/oil temperature > 110 ℃, exhaust pressure < 800Kpa or exhaust and gas/oil temperature ≥ 100 ℃, exhaust Lubrication and cooling of oil-injected rotary (vane and screw) air compressors working under the condition of air pressure of 800-1500Kpa.

Since the compressor oil has been in the condition of oxygen-enriched and high temperature coexisting for a long time, it is required that the oil must have excellent thermal oxidation stability, otherwise a large amount of deposits (coke deposits) will be generated and the air compressor will have carbon deposits and Blockage, causing an explosion and "lockup" of the machine. Oil products will be polluted by water in the air during use, so it is required to have good anti-emulsification and anti-rust properties, and it is also required to have a protective effect on copper and its alloys. Therefore, base oil alone cannot meet the above requirements, and a variety of additives with corresponding properties must be used.

The oil injection rotary (sliding vane and screw) air compressor oil additive compound formula of the present invention does not contain dialkyl dithiophosphate zinc type additive, but has used aromatic amine type high temperature antioxidant, and the former described different. At the same time, the combined use of 2.6-di-tert-butyl p-cresol, tricresyl phosphate and benzotriazole fatty amine salt greatly improves the thermal oxidation stability of the oil, which is different from the previous rotary oil injection (sliding vane and Screw) air compressor oil is completely different.

The composition of oil injection rotary type (sliding vane and screw) air compressor oil additive composite formula of the present invention is:

The type and amount of each additive in the additive compound formula used in light-duty (DAG) oil-injected rotary (sliding vane and screw) air compressor oil are:

Aromatic amine type high temperature antioxidant 0.1-0.6%, 0.3% is the best.

Phenolic antioxidant 0.1-1.0%, 0.3% is the best.

Phosphate-type oily agent 0.1-0.6%, 0.3% is the best.

Benzotriazole fatty amine salt multi-effect agent 0.01-0.1%, preferably 0.02%.

Alkenyl succinic acid rust inhibitor 0.01-0.1%, preferably 0.02%.

Composite anti-emulsifier 0-0.3%, preferably 0.02-0.05%.

Base oil is hydrorefined or solvent, clay refined mineral oil

The type and amount of each additive in the additive compound formula used in the medium-duty (DAH) oil-injected rotary (sliding vane and screw) air compressor oil are:

Aromatic amine type high temperature antioxidant 0.1～0.6%, 0.3% is the best

Phenolic antioxidant 0.1-1.0%, 0.6% is the best.

Phosphate-type oily agent 0.1-0.6%, 0.45% is the best.

Benzotriazole fatty amine salt multi-effect agent, 0.01-0.1%, preferably 0.02%.

Alkenyl succinic acid rust inhibitor 0.01-0.1%, preferably 0.02%.

The base oil is a mixture of polyalphaolefin synthetic oil and ester synthetic oil Balance

The type and amount of each additive in the additive compound formula for heavy-duty (DAJ) oil-injected rotary (sliding vane and screw) air compressor oil are:

Aromatic amine type high temperature antioxidant 0.1-0.6%, 0.3% is the best.

Phenolic antioxidant 0.1-1.0%, 0.9% is the best.

Phosphate-type oily agent 0.1-0.6%, 0.6% is the best.

Benzotriazole fatty amine salt multi-effect agent 0.01-0.1%, preferably 0.02%.

Alkenyl succinic acid rust inhibitor 0.01-0.1%, preferably 0.02%.

The base oil is a mixture of polyalphaolefin synthetic oil and ester synthetic oil. The balance.

The aromatic amine type high-temperature antioxidant in the compound formula of the present invention is N-phenyl-α-naphthylamine, which must be carefully refined and refined. The product name in China is T531, which is available for sale.

The phenolic antioxidant in the compound formula of the present invention is 2.6-di-tert-butyl-p-cresol, and its name in China is T501, which is available for sale.

The phosphate ester type oily agent in the compound formula of the present invention is tricresyl phosphate, and the trade name in China is T306, which is available for sale.

Benzotriazole fatty amine salt multi-effect agent in the compound formula of the present invention, its structural formula is:

In the formula, R is an alkyl or alkenyl group of C ₈ ~ C ₂₀ , and mainly C _18. This additive can improve the lubricity and rust resistance of oil products, and make metals oxidize hydrocarbons in oil products. Catalysis reduces activity. The domestic product name in China is T406 and it is available for sale.

The alkenyl group of the alkenyl succinic acid antirust agent in the compound formula of the present invention is C ₆ -C ₁₄ alkenyl group, mainly C ₁₂ , and the product name in China is T746, which is available for sale.

Base oils useful in the present invention include petroleum-based mineral lubricating oils (hydrorefined or dissolved clay refined), synthetic lubricating oils, and mixtures of mineral lubricating oils and synthetic lubricating oils. Mineral lubricants include HVI150, HVI200 and HVI400 neutral oils and 150BS oils. Synthetic hydrocarbon lubricants are polyalphaolefin oils and ester lubricants.

Compared with the additive formula used in the existing oil injection rotary (sliding vane and screw) air compressor oil, the air compressor oil composite formula of the present invention has the following advantages:

(1) Excellent thermal oxidation stability. It can be used at 100°C for a long time and 200°C for a short time.

(2) It has a long life of anti-oxidation stability. The oxidation stability life is as long as 3500 hours or more as measured by GB/T12581 method.

Detailed ways

Example 1

No. 32 light-duty rotary (vane and screw) air compressor oil

Base oil: No. 32 white oil 99.04%

Additive: N-phenyl-α-naphthylamine (T531) 0.3%

2.6-di-tert-butyl-p-cresol (T501) 0.3%

Tricresyl Phosphate (T306) 0.3%

Benzotriazole fatty amine salt (T406) 0.02%

Alkenyl succinic acid rust inhibitor (T746) 0.02%

The above-mentioned additives and the above-mentioned base oil are mixed, stirred and dissolved at 60°C to 80°C, then 0.02% composite antioxidant T1001 and 10PPM simethicone defoamer are added and stirred evenly. Its performance meets the requirements of 32 in the GB5904 standard, as shown in Table 1.

Example 2

No. 46 light-duty rotary (vane and screw) air compressor oil

Base oil: No. 46 white oil 99.04%

Additive: with additive and add-on in embodiment 1

Blending process: the same as the blending process in Example 1

The performance meets the requirements of 46 in the GB5904 standard, as shown in Table 1.

Example 3

No. 68 light-duty rotary (vane and screw) air compressor oil

Base oil: 5 centistokes white oil 9.90%

10 centistos white oil 89.14%

Additive: with additive and add-on in embodiment 1

Blending process: the same as the blending process in Example 1

The performance meets the requirements of 68 in the GB5904 standard, as shown in Table 1.

Example 4

No. 100 light-duty rotary (vane and screw) air compressor oil

Base oil: 10 centistokes white oil 79.24%

Hydrogenated 150BS19.81%

Additive: with additive and add-on in embodiment 1

Blending process: the same as the blending process in Example 1

The performance meets the requirements of 100 in the GB5904 standard, as shown in Table 1.

Example 5

No. 32 light-duty rotary (vane and screw) air compressor oil

Base oil: HVI150 neutral oil (dissolved clay refined oil) 99.04%

Additive: with additive and add-on in embodiment 1

Blending process: the same as the blending process in Example 1

Example 6

No. 32 light-duty rotary (vane and screw) air compressor oil

Base oil: No. 32 white oil 99.04%

Additive: N-phenyl-Q-naphthylamine (T531) 0.3%

      2.6-di-tert-butyl-p-cresol (T501) 0.3%

                                                                                                                (T309) 0.3%

  Benzenetriazole fatty amine salt (T406) 0.02%

    Alkenyl succinic acid rust inhibitor (T746) 0.02%

Blending process: the same as the blending process in Example 1

The performance is shown in Table 1.

Table 1

project DAH technical standard Example 6 DAJ technical standard Example 7 Viscosity grade 32 32 Kinematic viscosity 40℃mm²/s 100℃ 28.8～35.2 report 30.06 to be determined 29.15 viscosity index Not less than 90 135 145 Chroma, No. not greater than 1 less than 0.5 less than 0.5 Density, (20℃) g/cm Report Pour point, °C not higher than -9 -30 -50 Flash point (opening) Not less than 220 235 245 Acid value mgKOH/g Report 0.01 Anti-emulsification (40-37-3ml) min not more than 30 5 5 Foam property (foam tendency/foam stability) ML/ML24℃ Not greater than 300/0 50/0 50/0 Liquid phase corrosion (A method) no rust no rust no rust Corrosion test T₃ copper sheet, 100℃, 3h level not greater than 1 1a 1a Oxidation test (200℃ air Fe₂O₃) Evaporation loss, % not more than 20 12 Kang's carbon residue increase, % Not greater than 2.5 0.5 Oxidation stability, h 3000 8000 or more

Example 7

No. 32 medium duty (DAH) rotary (vane and screw) air compressor oil

Base oil: polyalphaolefin synthetic oil 49.25%

  8 centistokes white oil 49.295%

Additive: N-phenyl-α-naphthylamine (T531) 0.3%

      2.6-di-tert-butyl-p-cresol (T501) 0.6%

  Tricresyl Phosphate (T306) 0.45%

  Benzenetriazole fatty amine salt (T406) 0.02%

    Alkenyl succinic acid rust inhibitor (T746) 0.02%

Blending process: the same as the blending process in Example 1

The performance is shown in Table 1.

Example 8

No. 32 heavy-duty (DAJ) rotary (vane and screw) air compressor oil

Base oil: polyalphaolefin synthetic oil 78.56%

Synthetic diester 19.64%

Additive: N-phenyl-α-naphthylamine (T531) 0.3%

      2.6-di-tert-butyl-p-cresol (T501) 0.9%

Tricresyl Phosphate (T306) 0.6%

Benzotriazole fatty amine salt (T406) 0.02%

Alkenyl succinic acid rust inhibitor (T746) 0.02%

Blending process: the same as the blending process in Example 1

The performance is shown in Table 1.

0.-0.3 ^m % of compound anti-emulsifier can also be added to the formulas of the above examples as required.

Example 9

The air compressor oil made by using the compound formula of the oil injection rotary (sliding vane and screw) air compressor oil additive of the present invention has excellent thermal oxidation stability, and the distinction between light, medium and heavy load oils is very obvious. The experimental method is as follows; the experimental results are shown in Table 2.

laboratory apparatus:

1. Beaker 50ml

2. Flat electric furnace 500W

3.T ₁ copper wire

4. Thermometer 0℃～360℃

Method: 7 50ml beakers are used to respectively pack 20ml of the oil samples prepared in Example 1 to Example 8, and put into the oil three _T1 copper wires that are newly polished and cleaned, each about three centimeters long. Heat to 200°C with an electric furnace, then cool naturally to below 100°C, repeat heating and cooling until the oil sample in the cup turns black or deposits appear. Record the heating and cooling times and the total time of the experiment for each oil sample. The results are shown in Table 2.

Table 2 Experimental results

Oil sample name Heating times total time (hours) Exterior Example 1 12 4 red without precipitation Example 2 12 4 red without precipitation Example 3 12 4 red without precipitation Example 4 12 4 red without precipitation Example 5 9 3 dark brown without precipitation Example 6 12 4 light red without precipitation Example 7 12 4 Light yellow without precipitation Commercially available in Fushun (imported technology) 8 3 black with sediment Shanghai market (imported oil)-1 12 4 black with sediment Shanghai commercially available (imported oil)-2 12 4 black with sediment Nantong market (imported oil) 4 1 black with sediment

Claims (3)

1. a kind of oil injection rotary air compressor lubricating oil, it comprises base oil and additive, it is characterized in that: the weight ratio of additive in described lubricating oil is: N-phenyl-alpha-naphthylamine 0.3%, 2.6-di-tert-butyl p-cresol 0.3%, tricresyl phosphate 0.3%, benzotriazole fatty amine salt 0.02%, alkenyl succinic acid rust inhibitor 0.02%, 0.02% composite antioxidant T1001 and 10ppm dimethyl Silicone defoamer. 2. A lubricating oil for an oil-sprayed rotary air compressor according to claim 1, wherein the base oil includes petroleum-based mineral lubricating oil, synthetic lubricating oil, a mixture of mineral lubricating oil and synthetic lubricating oil. 3. A preparation method of lubricating oil for oil-sprayed rotary air compressors as claimed in claim 1, characterized in that: according to the above ratio, the additives and base oil are mixed and stirred to dissolve at 60°C to 80°C, and then added 0.02% composite antioxidant T1001 and 10ppm simethicone defoamer, and stir evenly.