NB/SH/T 0505-2017 Determination of shear stability of polymer-containing oils — Ultrasonic shear method

AI-translated method card — human verification pending. This is not an official translation of the standard. Unclear source values remain unverified; check the original standard and product certificate before use.

Card type: Test method

1. Method number / full title / English name / replacement relationship

• Standard number: NB/SH/T 0505—2017
• Chinese full title: Determination of shear stability of polymer-containing oils — Ultrasonic shear method
• English name: Standard test method for determination of shear stability of polymer-containing oils by ultrasonic shear method (original spelling is stabllity / ultrasomlc, requires confirmation against the source standard (source-text extraction))
• Replacement relationship: replaces SH/T 0505—1992 "Determination of shear stability of polymer-containing oils (ultrasonic shear method)"
• Issued/implemented: issued on 2017-12-27, implemented on 2018-06-01
• Custodian: National Technical Committee for Standardization of Petroleum Products and Lubricants, Subcommittee on Petroleum Fuels and Lubricants (SAC/TC280/SC1)
• Drafting organization: Sinopec Research Institute of Petroleum Processing
• Main drafters: Song Haiqing, Yang He, Xue Ying (the characters in the name require confirmation against the source standard (source-text extraction))
• Previous versions: SH/T 0505—1992

2. Scope of application and non-applicability

• This standard specifies a method for determining the shear stability of polymer-containing oils by the ultrasonic shear method (Chapter 1).
• Applicable to polymer-containing hydraulic oils and internal combustion engine oils (Chapter 1).
• Not applicable: no explicit non-applicability clause is provided in the available source.

3. Method principle

• 3.1 Place the probe of the energy concentrator (i.e., the ultrasonic oscillator) into a beaker containing an appropriate amount of polymer-containing test sample, subject it to ultrasonic shear treatment for a certain period of time, determine the change in its viscosity in accordance with GB/T 265, and finally calculate the viscosity decrease rate of the test sample.
• 3.2 The test sample undergoes a certain viscosity loss due to ultrasonic shear action in the energy concentrator; the viscosity decrease rate of the test sample is used to evaluate its shear stability.
• Note: In 3.1, the original wording of "a certain period of time" is "ultrasonic shear treatment for time"; for the specific time, see Chapter 7 (10 min), requires confirmation against the source standard (source-text extraction).

4. Reagents and materials (purity / preparation)

• 5.1 Water: distilled water, meeting grade three water as specified in GB/T 6682—2008.
• 5.2 Cleaning agent: petroleum ether meeting the requirements of class II in GB/T 15894—2008 and having a boiling range of 60 ℃~90 ℃, or solvent naphtha No. 1 meeting the requirements in GB 1922—2006. Warning: flammable, harmful to health.
• 5.3 Reference oil: RIPP-JQ- reference 2 oil (in one place the original writes RIPP-J9- reference 2 oil, requires confirmation against the source standard (source-text extraction)); under standard shear test conditions (test sample 30 mL, water bath temperature 38 ℃, shear time 10 min), the viscosity decrease rate is 16%±0.6%.

5. Instruments and equipment

• 4.1 Ultrasonic shear test apparatus: the output end of the energy concentrator is a cylindrical rod with a diameter of 20 mm; its end face is not center-drilled and not chamfered, and the surface roughness Ra is not greater than 1.6 μm (the original is 1.6pum, requires confirmation against the source standard (source-text extraction)). The resonance frequency is 20 kHz±1 kHz (the original is 20kHztlkHz, requires confirmation against the source standard (source-text extraction)).
• 4.2 Stopwatch: graduation 0.2 s (the original is 0.23, requires confirmation against the source standard (source-text extraction)).
• 4.3 Graduated cylinder: 50 mL, minimum graduation 1 mL (the original is ImL, requires confirmation against the source standard (source-text extraction)).
• 4.4 Beaker: 100 mL.
• 4.5 Thermometer: 0 ℃~100 ℃ stick thermometer, graduation value 1 ℃.
• 4.6 Viscosity measuring apparatus: viscometer and constant-temperature water bath meeting the requirements of GB/T 265.

6. Recommended operating conditions

• Standard shear test conditions: test sample 30 mL, water bath temperature 38 ℃, shear time 10 min (5.3, 7.2.2, 7.3.1, 10.1).
• Water bath control temperature: 38 ℃ (7.1.3); the water bath temperature is kept constant at 38 ℃±2 ℃ (7.1.4, the original is 38° plus or minus 2 seven, requires confirmation against the source standard (source-text extraction)).
• Energy concentrator output power: the standard-state power value found from the standard working curve according to the reference oil viscosity decrease rate 16% (6.1.2).
• Temperature for viscosity measurement after shearing: 40 ℃ (7.2.3, 7.3.2, 10.1).
• Instrument preheating: before each startup test, use reference oil or other lubricating oil already used in 30 mL and operate under standard shear test conditions for 15 min (7.1.1).
• Instrument calibration frequency: before each startup test, use reference oil to measure 1 times~2 times; if continuously operated for more than 24 h, the instrument should be calibrated once every 24 h (7.2.1).

7. Sampling and test sample preparation

• Use a graduated cylinder to measure 30 mL of test sample and pour it into a clean 100 mL glass beaker (7.1.4).
• Other sampling and test sample preparation requirements: not provided in the available source.

8. Analytical procedure

8.1 Operating procedure of the ultrasonic shear test apparatus (7.1)

• 7.1.1 To ensure the stability of instrument operation, before each startup test, use reference oil or other lubricating oil already used in 30 mL and operate under standard shear test conditions for 15 min, so that the instrument is fully preheated.
• 7.1.2 Place the ultrasonic shear test apparatus horizontally on the workbench, and pour water into the water bath tank until it is about 20 mm from the top edge of the tank (the original is 20m, requires confirmation against the source standard (source-text extraction)). Cover with the cover plate with the beaker rack, then place the water bath tank in the main unit, connect the temperature sensor cable and heating cable, and insert the sensing probe into the water bath tank (the extracted wording for the probe location in the water bath is garbled; requires confirmation against the source standard (source-text extraction)).
• 7.1.3 Turn on the power, open the power switch, set the energy concentrator output power value, water bath control temperature (38 ℃), and shear time, and begin controlling the water temperature.
• 7.1.4 Use a graduated cylinder to measure 30 mL of test sample and pour it into a clean 100 mL glass beaker. When the water bath temperature is constant at 38 ℃±2 ℃, place the beaker into the rack on the water bath cover plate so that the bottom of the beaker contacts the bottom of the rack.
• 7.1.5 Continue constant temperature for 10 min, lower the energy concentrator probe until its bottom end is at 5 mm±1 mm below the sample liquid surface (the original is "Smml", requires confirmation against the source standard (source-text extraction)), and pull down the soundproof cover.
• 7.1.6 Start the instrument to begin shearing the test sample.
• 7.1.7 When shearing reaches the predetermined test time, the instrument automatically stops shearing. Raise the energy concentrator probe to the top, pull the soundproof cover back up to its original position, and take out the test sample.
• 7.1.8 Use paper (the extracted wording referring to paper is garbled; requires confirmation against the source standard (source-text extraction)) to wipe clean the test sample on the surface of the end of the energy concentrator probe. For samples with higher viscosity, after each shearing is completed, clean with cleaning agent and dry it so that it can be used again next time.

8.2 Calibration procedure using reference oil (7.2)

• 7.2.1 Before each startup test, use reference oil to measure 1 times~2 times under standard shear test conditions, and calculate the viscosity decrease rate at a temperature of 40 ℃. If the viscosity decrease rate measured by this instrument is not within the range of 16%±0.6%, adjust the power value until the viscosity decrease rate of the reference oil equals 16%±0.6%; thereafter, this power value may be used for tests on new samples. If continuously operated for more than 24 h, the instrument should be calibrated once every 24 h.
• Note: In each calibration test, although the power value may differ due to adjustment, after uniform operation according to this standard, it is possible to effectively compare the results of tests obtained on different dates.
• 7.2.2 Proceed according to the procedure specified in clause 7.1, and use reference oil to measure 1 times~2 times under standard shear test conditions, each time 10 min.
• 7.2.3 According to GB/T 265, respectively measure the 40 ℃ kinematic viscosity values of the reference oil before and after shearing, and calculate the viscosity decrease rate. If necessary, adjust the power value accordingly.

8.3 Formal test (7.3)

• 7.3.1 Proceed according to the procedure specified in clause 7.1, and measure the test sample 2 times under standard shear test conditions, each time 10 min.
• 7.3.2 According to GB/T 265, respectively measure the 40 ℃ kinematic viscosity values of the test sample before and after shearing, and calculate the viscosity decrease rate.

8.4 Instrument preparation (Chapter 6)

• 6.1.1 Drawing of the standard working curve: the instrument manufacturer shall, before each instrument leaves the factory, calibrate it with reference oil and determine the standard working state of the instrument, and record the standard working curve in the instrument file. After the user unit has stopped for more than one month or after three months of normal use, it shall, according to the test procedure in Chapter 7, use reference oil at different energy concentrator powers (select several different power values according to the output power range of the energy concentrator of this instrument) to respectively measure the viscosity decrease rate of the reference oil (repeat the measurement twice at each power value and take the arithmetic mean), and use the viscosity decrease rate of the reference oil and the corresponding energy concentrator output power value to draw the standard working curve of this instrument.
• 6.1.2 According to the requirement of the viscosity decrease rate 16% specified for the reference oil, find the corresponding energy concentrator output power value from the standard working curve, and use this as the standard-state power value of this instrument.
• 6.1.3 (the original is unnumbered and listed after 6.1.2) Use a stopwatch to accurately verify the working time of the timing controller; its error must not exceed 10 s, otherwise adjustment is required.

9. Qualitative and quantitative determination and calculation formulas

• The viscosity decrease rate of the test sample X (%) is calculated according to formula (1):

  X = (ν₀ − ν) / ν₀ × 100 ……………… (1)

  Where:

  • ν₀——the kinematic viscosity value of the test sample 40 ℃ before shearing, in square millimeters per second (mm²/s);
  • ν—— the kinematic viscosity value of the test sample 40 ℃ after shearing, in square millimeters per second (mm²/s).

• Note: The smaller the relative viscosity loss value, the higher the viscosity stability.

• The original formula (1) source-text extraction is shown as "X=Y0-"×100 / Po, organized according to context and symbol descriptions, requires confirmation against the source standard (source-text extraction).

10. Precision

• 10.1 Precision: This precision was obtained by conducting interlaboratory tests using 5 samples in 11 laboratories and calculating according to GB/T 6683 "Determination of Precision Data for Petroleum Product Test Methods". The test conditions are: test sample 30 mL, water bath temperature 38 ℃, shearing time 10 min, and the sheared test sample is measured for kinematic viscosity decrease rate at 40 ℃. The reliability of the obtained results is judged using the following provisions (95% confidence level).

• Note: The kinematic viscosity decrease rate at other test temperatures before and after shearing can be determined by referring to this method, but the precision has not been investigated.

• 10.1.1 Repeatability r: The difference between two consecutive test results obtained by the same operator, in the same laboratory, using the same instrument, on the same test sample shall not exceed the calculated value of formula (2):

  r = 0.38X^0.095 ……………… (2)

  Where: X—— the average of two replicate test results. (The original formula (2) source-text extraction is shown as "r=0.38X0.095", the exponential form requires confirmation against the source standard (source-text extraction))

• 10.1.2 Reproducibility R: The difference between two single, independent test results obtained by different operators, in different laboratories, using different instruments, according to the same method, on the same test sample shall not exceed the calculated value of formula (3):

  R = 1.15X^0.095 ……………… (3)

  Where: X—— the average of two independent test results. (The original formula (3) source-text extraction is shown as "R=1.15X00.", the exponential form requires confirmation against the source standard (source-text extraction))

• 10.2 Bias: Since the determination of the test result value is based on the definition of this standard, this standard has no bias.

11. Report

• Take the arithmetic mean of two replicate determination results as the ultrasonic shear viscosity decrease rate of the test sample (%), retained to two decimal places (Chapter 9).

12. Normative References

• GB/T 265 Petroleum products—Determination of kinematic viscosity and calculation of dynamic viscosity (the original text is "determination method", requires confirmation against the source standard (source-text extraction))
• GB 1922—2006 Solvent naphtha for paints and cleaning (the original text is "for cleaning", requires confirmation against the source standard (source-text extraction))
• GB/T 6682—2008 Water for analytical laboratory use—Specification and test methods
• GB/T 6683 Determination of precision data for petroleum product test methods (the original text is "determination method", requires confirmation against the source standard (source-text extraction))
• GB/T 15894—2008 Chemical reagent—Petroleum ether
• Note: In Chapter 2, the original text writes GB/T 265 as "CB/T 265", GB 1922 as "CB1922", GB/T 6682 as "CB/T 6682", GB/T 6683 as "CB/T 6683", GB/T 15894 as "CB/T 15894", all require confirmation against the source standard (source-text extraction).

13. Source and verification

This page is an AI translation of the available Chinese method card. Human verification is pending. It is not an official translation of the standard. Check the source standard and product certificate before use.

14. Quick Q&A