This standard specifies the performance test and production test methods for forage seed eyelet drum selector. JB/T 6945.2-1993 Test methods for forage seed eyelet drum selector JB/T6945.2-1993 Standard download decompression password: www.bzxz.net

Where: 0.9—average relative density of the sample; Y—mass of additives contained in ~100g sample, g. 7.2
When the separated insoluble matter is liquid, the average volume V (mL) of the sample insoluble matter is calculated according to formula (4): V=
Where: Vi, V—represent the volume of insoluble matter in two centrifuge tubes, mL. The sample insoluble matter X[% (V/V)] is calculated according to formula (5): X2=
Where: Y2——volume of additives contained in 100mL sample, mL. 8Report
Report the mass percentage or volume percentage of the insoluble matter in the sample, and indicate solid or liquid. Additional remarks:
This standard was proposed by Maoming Petroleum Industry Company. This standard is under the technical jurisdiction of the Petrochemical Science Research Institute. This standard was drafted by the Maoming Petroleum Industry Company Research Institute. The main drafters of this standard are Zhang Yilong and Liu Honghui. This standard refers to the US Federal Standard FTM791b3440 <Test Method for Storage and Dissolution Characteristics of General Gear Oils>. The full text has been read. You need to use (4)
802~961
Inside +16~18
-100ml
SH/T0037-90
Outside 36.00~37.75
Conical flask: 250mL.
The side of the body
Must be straight
Beaker: tall type, 400mL.
Dryer: can accommodate several centrifuge tubes.
Oven: The temperature can be adjusted at 105℃±3℃. Balance: Sensitivity 1mg.
>10 ~25
>25 ~100
4.2 Materials
Solvent: The quality meets the requirements of Table 2.
5 Reagents
Petroleum ether: 60~90℃, analytical grade.
9'69~9°29
22.5~24.5
Centrifuge tube diagram
Inner bottom line
Allowable tolerance of centrifuge tube calibration
Minimum scale
Center end of high centrifuge tube
Allowable tolerance
Potassium dichromate: Prepared into washing solution.
95% ethanol: chemically pure.
Density (20℃), gem
Distillation range:
Distillation volume below 130℃, %
Distillation volume below 160℃, %
Dry point, ℃
Color, number
6 Test steps
not greater than
not higher than
not lower than
Proceed as follows to prepare two centrifuge tubes.
SH/T0037—90
Table 2 Solvent quality requirements
Quality indicators
0.836~0.881
90 ~95
a. Wash the centrifuge tube with petroleum aldehyde and potassium dichromate solution, and then rinse with distilled water and 95% ethanol: b. Place the washed centrifuge tube upside down in an oven and dry it at 105℃±3℃ for 1.5h; c. Take out the centrifuge tube from the oven, put it in a dryer, and cool it for 30min; d. Weigh the centrifuge tube to 0.001g and keep it in a coal dryer before use. Determination method
GB/T1884
GB/T6536
GB/T3555
6.2 Take 220mL of the newly prepared sample that has not been stored, put it into a 400mL beaker, heat it to 121℃±1℃, keep it for 20min, and then let it cool to 25℃±3℃.
6.3 Add 100mL of the heated sample to each of the two weighed centrifuge tubes, cover them with stoppers, store them upright on a centrifuge tube rack at room temperature, and store them away from light for 30d.
6.4 After storage, take out the centrifuge tube from the storage room (be careful not to stir the insoluble matter), and centrifuge it on a centrifuge at the speed calculated by formula (1) for 30min±1min. After the rotation stops, take out the centrifuge tube. 6.5 If the insoluble matter in the centrifuge tube is solid, deal with it as follows. 6.5.1 If the insoluble matter is a dense solid after centrifugation, discard the upper layer of oil in the centrifuge tube, and then invert the centrifuge tube vertically on a conical flask to drain for 2 hours. Wash each centrifuge tube with solvent, and stir and disperse the insoluble matter with a clean wire, and then centrifuge for 15 minutes. After centrifugation, pour off the upper clear liquid as much as possible, but do not stir the insoluble matter. Repeat the washing several times until the insoluble matter is free of oil.
6.5.2 If the insoluble matter is loose after centrifugation, gently pour off the upper layer of oil, continue centrifugation for 15 minutes, and then pour off the upper layer of oil. Repeat this until the oil is completely poured out, and then handle according to 6.5.1. 6.5.3 If the insoluble matter is still suspended after centrifugation, cover the stopper, put it back to the original storage place, and store it again for 30 days. After the second busy storage cycle is completed, handle according to 6.4 and 6.5.1. 6.5.4 Place the centrifuge tube vertically in an oven, adjust the temperature to 105℃±3℃, and dry for 1.5h6.5.5 Take out the centrifuge tube from the oven, place it in a desiccator to cool for 30min, weigh the centrifuge tube to 0.001g, subtract the mass of the empty tube to obtain the mass of the insoluble matter.
6.6 If the insoluble matter is liquid after centrifugation, cover the stopper, put it back to the original storage place, and continue to store for 30d. At the end of the second storage cycle, after processing according to 6.4, read the volume of the liquid insoluble matter directly from the centrifuge tube to 0.05mL. 7 Calculation
When the separated insoluble matter is solid, the average mass m (g) of the insoluble matter of the sample is calculated according to formula (2): m=
Where: ml, m2
SHT0037--90
represent the mass of the insoluble matter in the two centrifuge tubes, respectively. The insoluble matter X[% (m/m) of the sample is calculated according to formula (3): X, = 0.9 × Y
Where: 0.9—average relative density of the sample; Yi—mass of additives contained in 100g sample, g. 7.2
When the separated insoluble matter is liquid, the average volume V (mL) of the insoluble matter of the sample is calculated according to formula (4): V+V2bZxz.net
Where: VI, V2—represent the volume of insoluble matter in two centrifuge tubes, mL. The insoluble matter X[% (V/V) of the sample is calculated according to formula (5): X2=
—volume of additives contained in 100mL sample, mL. Where: Y
8Report
Report the mass percentage or volume percentage of the insoluble matter of the sample, and indicate solid or liquid. Additional remarks:
This standard is proposed by Maoming Petroleum Industry Company. This standard is under the technical supervision of the Petrochemical Research Institute. This standard was drafted by the Maoming Petroleum Industry Company Research Institute. The main drafters of this standard are Zhang Yilong and Liu Honghui. This standard refers to the US Federal Standard FTM791b3440 "Storage and Solubility Characteristics Test Method for General Gear Oils". (3)
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