Mixed lubricating oil for turboprop engine and preparation method thereof

Abstract

The invention belongs to the field of petrochemical engineering, and discloses mixed lubricating oil for a turboprop engine and a preparation method. The mixed lubricating oil is formed by mixing 8B aviation jet lubricating oil and 20 # aviation piston engine lubricating oil according to a certain proportion; in a low-temperature environment lower than-40 DEG C, the weight ratio of 8B aviation jet lubricating oil to 20 # aviation piston engine lubricating oil is 74.8: 25.2; in a high-temperature environment higher than 120 DEG C, the weight ratio of 8B aviation jet lubricating oil to 20 # aviation piston engine lubricating oil is 25.2: 74.8. The adopted preparation method is simple, the proportion is proper, the kinematic viscosity of the mixed lubricating oil at 100 DEG C is 4.3-4.7 centistokes, the acid value is not larger than 0.05 mgKOH / g, the residual carbon value is not larger than 0.15%, the flash point is not lower than 138 DEG C, the density is not smaller than 0.87 g / cm < 3 > at 20 DEG C, and the freezing point is not higher than-35 DEG C, and various properties of the lubricating oil meet the lubricating requirements of domestic WJ-6 series turboprop engines.

Description

Technical Field

[0001] The invention belongs to the field of petrochemical industry and relates to a mixed lubricating oil for a turbopropeller engine and a preparation method thereof. Background Art

[0002] Currently, there is no lubricant specifically for WJ-6 series turboprop engines. Among the lubricant products, 8B aviation jet lubricant (standard GB439) and No. 20 aviation piston engine lubricant (standard GJB1219A) cannot meet the engine lubrication requirements when used alone. No. 20 aviation lubricant is mainly used for the lubrication and cooling of friction surfaces such as cylinders, pistons, crankshaft connecting rod mechanisms, propeller reducers and accessory transmission mechanisms of piston aircraft engines. It is also used to seal the gap between the piston and the cylinder to prevent gas from entering the crankcase. It also has the effect of cleaning and rust prevention for the engine. However, the low-temperature performance of No. 20 aviation lubricant is poor, and domestic aircraft of various types require various climate operations. No. 20 aviation lubricant is not suitable for complex low-temperature environments. 8B lubricant has better low-temperature starting performance and viscosity-temperature performance, and is suitable for turbojet engines flying in cold areas. Summary of the invention

[0003] Technical problem solved by the present invention: The purpose of the present invention is to solve the problem that a single domestic lubricating oil is not suitable for lubricating WJ-6 series turboprop engines in complex low-temperature environments.

[0004] The technical solution of the present invention:

[0005] On the one hand, the present invention provides a mixed lubricating oil for a turboprop engine, wherein the mixed lubricating oil is a mixture of 8B aviation jet lubricating oil and No. 20 aviation piston engine lubricating oil in a certain proportion;

[0006] At low temperatures below -40°C, the weight ratio of 8B aviation jet lubricant to No. 20 aviation piston engine lubricant is 74.8:25.2;

[0007] In a high temperature environment above 120°C, the weight ratio of 8B aviation jet lubricant to No. 20 aviation piston engine lubricant is 25.2:74.8.

[0008] On the other hand, the present invention provides a method for preparing a mixed lubricating oil for a turboprop engine. The mixed lubricating oil in a low temperature environment is prepared as follows:

[0009] Step 1: Calculate the amount of 8B aviation jet lubricant and No. 20 aviation piston engine lubricant in a weight ratio of 74.8:25.2, and pump the two oils into the reactor through a high-suction gear pump;

[0010] Step 2: fully mix and stir the two oils in a reactor;

[0011] Step 3: Circulate and mix at a temperature not lower than 15°C for 48 hours;

[0012] Step 4: Take oil samples and conduct physical and chemical property tests according to the specified items;

[0013] Step 5: After passing the test, the mixed lubricating oil in the reactor is pumped into the tanker through a gear pump for standby use.

[0014] Furthermore, the total weight of the mixed lubricant in each reactor should not exceed two tons during a single preparation process.

[0015] Furthermore, physical and chemical performance tests are carried out according to the specified items, specifically:

[0016] The kinematic viscosity of the mixed lubricating oil at 100°C is 4.3-4.7 centistokes.

[0017] Furthermore, physical and chemical performance tests are carried out according to the specified items, specifically: the acid value of the mixed lubricating oil is not greater than 0.05 mgKOH / g.

[0018] Furthermore, physical and chemical performance tests are carried out according to the specified items, specifically: the residual carbon value of the mixed lubricating oil is not greater than 0.15%.

[0019] Furthermore, physical and chemical performance tests are carried out according to the specified items, specifically: the flash point of the mixed lubricant is not lower than 138°C.

[0020] Furthermore, physical and chemical performance tests are carried out according to the specified items, specifically: the density of the mixed lubricating oil at 20°C is not less than 0.87g / cm 3 .

[0021] Furthermore, the freezing point of the mixed lubricating oil is not higher than -35°C.

[0022] The mixed lubricant prepared by this method can solve the problem of no suitable lubricant for WJ-6 series turbopropeller engines. It overcomes the problem that the use of No. 20 aviation lubricant alone is not suitable for complex low-temperature environments. The mixed lubricant after preparation has a kinematic viscosity of 4.3-4.7 centistokes at 100°C, an acid value of no more than 0.05 mgKOH / g, a residual carbon value of no more than 0.15%, a flash point of no less than 138°C, and a density of no less than 0.87 g / cm at 20°C. 3 , the freezing point is not higher than -35℃, and its various performances meet the use requirements of WJ-6 series turboprop engines. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of aviation lubricant oil preparation. DETAILED DESCRIPTION

[0024] The technical solution of the present invention is described in detail below in conjunction with the accompanying drawings.

[0025] In order to solve the problem of no suitable lubricating oil for turboprop engines, this problem can be solved by mixing 8B aviation jet lubricating oil and No. 20 aviation piston engine lubricating oil in a certain proportion. Add the two lubricating oils in a weight ratio of 74.8% 8B aviation jet lubricating oil and 25.2% No. 20 aviation piston engine lubricating oil to the reactor of the mixed lubricating oil system for mixing. Stir and mix at a temperature not lower than 15°C. No more than 2T should be in each reactor, and the circulation mixing time is 48h. After the preparation is completed, the oil sample is taken for physical and chemical property testing. The kinematic viscosity at 100°C is 4.3-4.7 centistokes, the acid value is not more than 0.05mgKOH / g, the residual carbon value is not more than 0.15%, the flash point is not less than 138°C, and the density at 20°C is not less than 0.87g / cm 3 , the freezing point is not higher than -35℃, and all performances meet the use requirements of WJ-6 series turboprop engines.

[0026] After preparation, oil samples are taken for physical and chemical property testing.

[0027] Step 1: Calculate the amount of 8B aviation jet lubricant and No. 20 aviation piston engine lubricant in a weight ratio of 74.8:25.2, and pump the two oils into the reactor through a high-suction gear pump;

[0028] Step 2: fully mix and stir the two oils in a reactor;

[0029] Step 3: Circulate and mix at a temperature not lower than 15°C for 48 hours;

[0030] Step 4: Take oil samples and conduct physical and chemical property tests according to the specified items;

[0031] Step 5: After passing the test, the mixed lubricating oil in the reactor is pumped into the tanker through a gear pump for standby use.

[0032] use Figure 1 Equipment, add the two lubricating oils in different proportions into the reactor of the mixed lubricating oil system and mix them, stir and mix them at a temperature not lower than 15°C, each tank should not exceed 2T, and the circulation mixing time is 48h (the actual operation time of the equipment). The specific preparation is as follows:

[0033] Step 1: Calculate the amount of 8B aviation jet lubricant and No. 20 aviation piston engine lubricant in a weight ratio of 74.8:25.2, and pump the two oils into the reactor through a high-suction gear pump;

[0034] Step 2: Start the equipment and fully mix and stir the two oils in the reactor;

[0035] Step 3: Observe the mold temperature controller readings and circulate and mix for 48 hours at a temperature not lower than 15°C;

[0036] Step 4: Take oil samples and conduct physical and chemical property tests according to the specified items;

[0037] Step 5: After passing the test, the mixed lubricating oil in the reactor is pumped into the tanker through a gear pump for standby use.

[0038] The mixed lubricant prepared by this method can solve the problem of no suitable lubricant for WJ-6 series turbopropeller engines. It overcomes the problem that the use of No. 20 aviation lubricant alone is not suitable for complex low-temperature environments. The mixed lubricant after preparation has a kinematic viscosity of 4.3-4.7 centistokes at 100°C, an acid value of no more than 0.05 mgKOH / g, a residual carbon value of no more than 0.15%, a flash point of no less than 138°C, and a density of no less than 0.87 g / cm at 20°C. 3 , the freezing point is not higher than -35℃, and its various performances meet the use requirements of WJ-6 series turboprop engines.

Claims

1. A mixed lubricating oil for a turboprop engine, characterized in that: The mixed lubricating oil is a mixture of 8B aviation jet lubricating oil and No. 20 aviation piston engine lubricating oil in a certain proportion; At low temperatures below -40°C, the weight ratio of 8B aviation jet lubricant to No. 20 aviation piston engine lubricant is 74.8:25.2; In a high temperature environment above 120°C, the weight ratio of 8B aviation jet lubricant to No. 20 aviation piston engine lubricant is 25.2:74.

8.

2. A method for preparing a mixed lubricating oil for a turboprop engine, characterized in that: The mixed lubricant for low temperature environment is formulated as follows: Step 1: Calculate the amount of 8B aviation jet lubricant and No. 20 aviation piston engine lubricant in a weight ratio of 74.8:25.2, and pump the two oils into the reactor through a high-suction gear pump; Step 2: fully mix and stir the two oils in a reactor; Step 3: Circulate and mix at a temperature not lower than 15°C for 48 hours; Step 4: Take oil samples and conduct physical and chemical property tests according to the specified items; Step 5: After passing the test, the mixed lubricating oil in the reactor is pumped into the tanker through a gear pump for standby use.

3. The method for preparing a mixed lubricating oil for a turboprop engine according to claim 2, characterized in that: During a single preparation, the total weight of mixed lubricant in each reactor should not exceed two tons.

4. The method for preparing a mixed lubricating oil for a turboprop engine according to claim 2, characterized in that: Carry out physical and chemical performance tests according to the specified items, specifically: The kinematic viscosity of the mixed lubricating oil at 100°C is 4.3 to 4.7 centistokes.

5. The method for preparing a mixed lubricating oil for a turboprop engine according to claim 2, characterized in that: Carry out physical and chemical performance tests according to the specified items, specifically: the acid value of the mixed lubricating oil is not greater than 0.05mgKOH / g.

6. The method for preparing a mixed lubricating oil for a turboprop engine according to claim 2, characterized in that: Carry out physical and chemical performance tests according to the specified items, specifically: the residual carbon value of the mixed lubricating oil is not greater than 0.15%.

7. The method for preparing a mixed lubricating oil for a turboprop engine according to claim 2, characterized in that: Carry out physical and chemical performance tests according to the specified items, specifically: the flash point of the mixed lubricating oil shall not be lower than 138℃.

8. The method for preparing a mixed lubricating oil for a turboprop engine according to claim 2, characterized in that: Physical and chemical performance tests are carried out according to the specified items, specifically: the density of the mixed lubricating oil at 20°C is not less than 0.87g / cm 3 .

9. The method for preparing a mixed lubricating oil for a turboprop engine according to claim 2, characterized in that: The freezing point of the mixed lubricating oil is not higher than -35℃.

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