This standard specifies the determination method of the coarse particle fraction of acetylene carbon black. This standard is applicable to the determination of the coarse particle fraction of acetylene carbon black. GB/T 3781.5-1993 Determination of the coarse particle fraction of acetylene carbon black GB/T3781.5-1993 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Acetylene black-Determination of grit content
GB/T 3781.5-93
Replaces CB 3781.583
Method A of this standard refers to the international standard ISO1437-1985 "Rubber compounding agent-Determination of carbon black sieve residue". 1 Subject content and scope of applicationbzxZ.net
This standard specifies the method for the determination of acetylene carbon black coarse particle content. This standard is applicable to the determination of acetylene carbon black coarse particle content. 2 Method A (arbitration method)
2.1 Principle
Control the water flow pressure to wash a known mass of acetylene black through a test sieve, dry the test sieve and weigh the residue. 2.2 Instrument
2.2.1 Water-washed sieve residue determination instrument. Figure 1 is a schematic diagram of the principle of the main components of the instrument. The domestic TBY-60 washing sieve residue determination device meets the requirements of this standard.
2.2.1.1 Test sieve: 150pm (100 months). 2.2.1.2 Funnel or container: bottom and test sieve combined. 2.2.1.3 Nozzle: spray clean water within the control pressure range to wash the sample and pass it through the test sieve. 2.2.1.4 Water pressure regulating device.
2.2.1.5 Filter, a metal mesh installed on the water supply line, its aperture should be at least the same as the test sieve. 2.2.2 Constant temperature drying oven: can control 105±2℃. 2.2.3 Analytical balance: accurate to 0.1mg
2.2.4 Desiccator.
2. 2. 5 Industrial balance, accurate to 0. 2 g. 2-2-6 Beaker: 1000mL.
2.3 Reagents
2.3.1 95% ethanol (GB679) analytical grade.
2.3.2 5% ethanol solution: Measure 53mL of 95% ethanol solution into a 1000mL measuring cylinder and dilute to the mark with water. 2.4 Steps
2.4.1 Weigh 50g of sample with an industrial balance, accurate to 0.2g. 2.4.2 Place the sample into a clean 1000mL beaker (2.2.6), add about 200ml of 5% ethanol solution (2.3.2) and stir with a glass rod until it becomes a paste. 2.4.3 Clean the filter installed on the water supply line before the test. Approved by the State Administration of Technical Supervision on March 3, 1993
Implementation on December 1, 1993
GB/T 3781.5-93
Schematic diagram of the principle of water-washed sieve residue tester
[—Water inlet; 2—Clean water pump: 3-Water filter: 4--Water pressure regulator: 5—Pipe fittings 16 Water valve; 7—Charcoal hopper (funnel-hopper) 8 Test sieve (filter screen): 9—Water nozzle; 10—Flushing hose? 11 Pressure gauge: 12—Water tank 2.4.4 Adjust the water pressure to the specified pressure of 0.21±0.01MPa. Install the test sieve (2.2.1.1) on the funnel or container (2.2.1.2), rinse with water for 3 minutes, and check the test sieve. If no granular matter is seen, the device can be used. 2.4.5 Start flushing, pour the paste in the beaker into the funnel or container several times, and operate carefully so that all the samples pass through the sieve. 2.4.6 Rinse the sample from the periphery of the funnel or container, and continue to flush the residue on the sieve until the water passing through the sieve is clear. 2.4.7 Remove the test sieve and gently break up the block sample that has not been flushed off with your hands, but do not use too much force to avoid deformation of the sieve. 2.4.8 Rinse the test sieve again for 2 minutes according to the above method (2.4.6, 2.4.7). 2.4.9 Remove the test sieve with residue and place it in a drying oven (2.2.2) at 105±2℃ to dry for 1 hour. 2.4.10 Take out the test sieve, put it in a desiccator (2.2.4) to cool for 30 minutes, and weigh (m1) to an accuracy of 0.1 mg. Use a fine brush to brush the sieve residue off the sieve plate, and then weigh the test sieve (mz) to an accuracy of 0.1 mg. 2.5 Result Expression
The coarse particle fraction G is expressed as a mass percentage and is calculated according to formula (1): ml-m2×100
wherein, ni-
the mass of the coarse particle fraction of the test sieve,!
the mass of the test sieve, B1
the mass of the sample.
The calculation result is accurate to 0.01% and shall be subject to the result of the first measurement. 2.6 Test Report
The test report shall include the following items:
The national standard number on which this test is based,
the type and mark of the sample,
the specification of the test sieve,
the equipment model and water pressure:
Indicate the drying oven temperature;
I. Test method and results;
Chang. Test period.
3.1 Principle
GB/T 3781. 5-93
Precisely take a certain amount of sample into a beaker, add a dilute solution of ethanol as a wetting agent, adjust it into a roll shape, put it into a 150um (100 mesh) test sieve, and rinse it with tap water. Then dry and weigh the residue left on the sieve, which is the coarse particle fraction. 3.2 Reagents
3.2.1 95% ethanol (GB 679); analytical grade. 3.2.25% ethanol solution; measure 53mL of 95% ethanol solution into a 1000mL measuring tube, and dilute it to the mark with water. 3.3 Instruments
3.3-1 Analytical balance, accurate to 0.1 mg3.3-2 Industrial balance: accurate to 0.2 g
3.3.3 Constant temperature drying oven: can be controlled at 105±2.3.3.4 Beaker, 1000 mL
3.3.5 Volumetric cylinder: 1000 mL.
3.3.6 Weighing bottle: short type. Diameter 50 mm, height 30 mm. Test sieve: specification 150 μm (100 mesh), sieve according to the gap of the connecting part of the metal sieve, and seal it from the inside with solder or epoxy resin.
3.3.8 Rubber brush: rubber part 40 mm×mm×20 mm, part A phosphorus 70~80 degrees. 3.3.9 Dryer.
3.4 ​​Test steps
3.4.1 Weigh 50g of sample with an industrial balance, accurate to 0.2g. 3.4.2 Place in a clean 1000mL beaker (3.3.4), add about 200mL of 5% ethanol solution (3.2,2), and stir with a glass until it becomes a paste.
3.4.3 Adjust the water flow. Pour the paste in the beaker into the sieve several times, rinse with water and gently brush with a rubber brush to make the sample pass through the sieve.
3.4.4 Repeat the above (3.1.3) operation until all the paste in the beaker is poured into the sieve, rinse the beaker with water until the water flowing out of the sieve is clear.
3.4.5 Rinse the residue on the sieve with tap water and use a rubber brush to sweep it to the center of the sieve. 3.4.6 Place the residue on the sieve in a constant temperature dehumidification box (3.8.3), maintain the temperature at 105 + 2 °C, and dry for 30 minutes. 3.4.7 Place the sieve with the residue in a desiccator and cool to room temperature. After about 30 minutes, transfer the residue into a weighing bottle of known mass and weigh it to the nearest 0.1 trig.
3.5 Result Expression
The coarse particle fraction G is expressed as a mass percentage and calculated according to formula (2): m1×100
=mass of the residue, g;
=m
=mass of the sample.
The result of one measurement shall prevail, and the result shall be accurate to 0.01%. 3.6 Test report
The test report shall include the following items:
The national standard number on which the test is based;
The type and mark of the test sample;
GB/T3781.5-93
Indicate the differences from the specified test steps; record the abnormal phenomena that occurred during the test;
Test date.
Additional remarks:
This standard is proposed by the Ministry of Chemical Industry of the People's Republic of China and is under the jurisdiction of the Carbon Black Industry Research and Design Institute of the Ministry of Chemical Industry. This standard was drafted by the Carbon Black Industry Research and Design Institute of the Ministry of Chemical Industry. The main drafters of this standard are Yu Lian and Meng Chuanying. This standard is equivalent to the coarse particle content determination method in the Japanese Industrial Standard JIS K1469--84 (89) "Acetylene Black".
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