GB/T 3814-1983 Determination of viscosity of montan wax GB/T3814-1983 standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Determination of viscosity of montan waxUDC 665.44
GB 3814—83
This method is applicable to the determination of the viscosity of montan wax. Key points of the method: Under the specified temperature, the time for the body ball of montan wax to fall in the inclined test tube filled with the test liquid is measured, and the viscosity of liquid montan wax is obtained by calculation.
1 Instruments, materials and reagents
1.1 Inclined rolling ball viscosityit (the instrument structure is shown in the figure below). The instrument should meet the requirements of "G214-80 Rolling Ball Viscometer".
Rolling ball viscometer
1-Connector: 2-cap; 3-inlet pipe, 4-outlet pipe: 5-thermometer: 6-nut; 7-pipe plug, 8-heat, 9-capillary tube 10-metal bucket plug, 11-test ball, 12-level, 13-positioning hole; 14-positioning lock nail; 15-adjusting water half bolt, 16-washer: 17-plug 18-cap, ?,,-measuring tube ring mark line National Bureau of Standards 198308-03 issued
1984-05-01 implementation
GB 3814-83
1.2 Constant tank: constant temperature control ±0.1℃, equipped with constant temperature liquid output circulation pump. 1.3 Stopwatch: division is 0.2s.
1.4 Fluorescent lamp: 40W.
1.5 Oven: can control 110±2℃.
1.6 Electric heating fan.
1.7 Porcelain plate, tweezers.
1.8 Glass beaker: 250ml.
1.9 Heat-resistant rubber tube, absorbent cotton, glass rod. 1.10 Benzene (GB690-77): chemically pure. 2 Preparation
2.1 Instrument preparation bzxz.net
2.1.1 Before the measurement, the viscometer's measuring tube, funnel plug, and pipe plug must be cleaned with benzene and blown with electric heating air. 2.1.2 Install the viscometer on the operating table and adjust the level. Connect the inlet and outlet pipe heads of the viscometer and the liquid supply pipe head of the thermostatic bath with a hose. 2.1.3 Select a 80～100±0.2℃ thermometer and insert it into the nut sleeve, put on the rubber ring, screw it into the insulation sleeve, connect the liquid in the constant temperature bath and circulate it.
2.1.4 Select the test ball according to the viscometer factory manual, or select a test ball that passes through the test pipeline in the test liquid for slightly longer than 30s. For the viscosity of lignite wax at 90℃, it is generally appropriate to use a No. 2 or No. 3 ball. 2.1.5 Put the clean test ball, metal funnel plug, and pipe plug into a porcelain plate and preheat it in a 110℃ oven for 10 minutes. 2.2 Sample preparation
Take 60～70g of the sample and put it into a 250ml clean beaker, place it in an oven with a constant temperature of 110±2℃, and melt and statically settle for a total of 30 minutes.
3 Determination steps
3.1 Unscrew the tube cover and quickly inject the melted lignite wax test solution along the inner wall of the test tube until it is about 15mm away from the top of the test tube. Use the test ball clamp to gently place the preheated test ball into the test tube and put on the metal funnel plug. After the bubbles in the wax liquid disappear, put on the sealing ring and tube plug and tighten the tube cover. The constant temperature time in the constant temperature glass jacket at 90±0.1℃ shall not be less than 30min. 3.2 Determine the falling time of the test ball: put the viscometer in the working position, turn on the fluorescent light, and when the "equator line" of the test ball drops to coincide with the annular mark line of the test tube, start the stopwatch. When the "equator line" of the test ball drops to coincide with the lower annular mark line of the test tube, stop the stopwatch and record the falling time of the test ball. Then gently pull out the fixed axis with your fingers, rotate the viscometer body 180°, let the test ball fall to the top of the test tube, and then turn the body back to the working state, and then perform the second measurement. From the third time onwards, measure three times in succession and take the arithmetic mean as the ball falling time. The difference between the results of each measurement should not be greater than ±1% of the arithmetic mean. 3.3 After the measurement, unscrew the tube cover, take out the tube plug and funnel plug, and then turn the viscometer body upside down to allow the wax liquid and the test ball in the measuring tube to flow into the beaker. Immediately use the test ball clamp to take out the test ball, wipe off the wax on the test ball with absorbent cotton, and put it into the beaker with benzene, wash, and wipe. Wipe off the wax on the wall of the measuring tube with absorbent cotton and wash it with benzene. Rotate the viscometer body to release the washing benzene. Close the constant temperature bath and release the constant temperature liquid in the glass jacket.
4 Calculation of results
4.1 The dynamic viscosity of lignite wax is calculated by the following formula: n=(o-)T
Wherein: n,
Viscosity of the test solution at temperature t, cP,
Test ball constant;
Test ball density, g/cm2,
GB 3814-83
PgDensity of the test solution at 90°C, g/cm3Note; T
-Average time for the test ball to fall, s.
Note: Determine according to GB3813-83 "Determination of Density of Lignite Wax", and then calculate according to the following formula; g=
Formula α-
Weight of the empty specific gravity bottle, g,
(b+G) -(a+d)
-Weight of the specific gravity bottle filled with water, g!
Weight of the pycnometer filled with some wax, g;
Weight of the pycnometer filled with wax and water:
Density of water at 90°C, g/cm2.
4.2 The calculated result shall be rounded to one decimal place, and the test ball number shall be indicated. 5 Allowable difference
The difference between parallel determinations shall not exceed the following provisions: Allowable difference (absolute)
Viscosity range
Additional instructions:
One laboratory
Different laboratories
This standard was proposed by the Ministry of Coal Industry of the People's Republic of China and is technically managed by the Beijing Coal Chemistry Institute of the Coal Research Institute. This standard was drafted by the Shulan Mining Bureau. The main drafters of this standard are Li Yinfu and Li Taoyun. 717
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