This standard specifies the indirect determination method of furnace carbon black particle size for rubber. This standard is applicable to the determination of furnace carbon black particle size for rubber. GB/T 3780.17-1995 Indirect determination of carbon black particle size Reflectivity method GB/T3780.17-1995 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Indirect determination of particle size-Keflectance method
Carbon black. Indirect determination of particle size-Keflectance method 1 Subject content and scope of application
This standard specifies the indirect determination method of furnace carbon black particle size for rubber. This standard is applicable to the determination of furnace carbon black particle size for rubber. 2 Reference standards
GB3778 Technical conditions for carbon black for rubber
GH 6t03 Test sieve
HG/T2725 Bulk carbon black sampling method
3 Source
GB/T 3780. 17--1995
Replaces GB/T 3780.17-N3
The light source shines on the surface of carbon black at 45°. Carbon black absorbs part of the incident light, and a small part of the incident light is reflected from the carbon black surface. The smaller the carbon black particle size, the weaker the reflected light. The photoelectric tube converts the light energy of the vertically incident light into electrical energy. The reflectivity reading is read on the scale of the medium-sized photometer. The particle size of the carbon black is calculated from the relationship between the reflectivity and the particle size. 4 Instruments and equipment
4.1 Brush, flat hair length ≥ 2c
4.2 Scrape.
4.3 Test sieve: aperture 75μm, in accordance with GB6003. 4.4 (Light) reflectometer.
Note: [cngichron reflectometer or instrument with similar performance can be selected. 4.5 Sample holder: 130mm×75mm×6mm. There are two holes on it. The aperture is 25mm. See Figure 1l
Sample grinder
Approved by the State Administration of Technical Supervision in 1995-1220
Implementation on August 1, 1996
GB/T 3780.17 1995
4.6 Sample trough: outer diameter 241m, inner diameter 16rm, height 6mm, trough depth 4mm, Figure 2, 16
Figure 2 Sample trough
5 Beam sample
Bagged carbon black shall comply with the provisions of 6.2 in GB 3778, and bulk carbon black shall comply with the provisions of 1HG/T 2725. 6 Steps
6.1 Sample preparation
Dry the sample at 105+2℃ for 1h-take it out and cool it to room temperature in a desiccator, then sieve it at 75℃, put it back in a desiccator and keep it for later use.
Note: If continuous screening is carried out, be sure to carefully check and remove the residual carbon black particles in the sieve. 6.2 Sample preparation
Use a sample spoon to add the sieved sample into the sample tank. Then use an oil scraper to gently scrape the sample to fill the entire sample tank and remove the excess sample. Repeat the above operation until a flat and smooth carbon black surface is prepared. Each sample preparation requires about 5 to 7 ml. The prepared sample that meets the requirements is placed in a desiccator for later use. Prepare the industrial reference carbon black sample No. [RB] in the same way. 6.3 Reflectivity determination
Prepare two samples for parallel determination.
Turn on the power supply and preheat the reflectometer for at least 30 minutes. Turn the reflectometer selection switch to 3, then place the prepared industrial reference black 1RB4 sample tank in the round hole of the sample holder, place the reflectometer measuring head on the sample holder, align the projected light spot with the center of the sample, turn on the measuring load and close it, rotate the calibration knob to make the reading on the reflectivity scale 40 (i.e. the reflectivity of IRB4 is 0.04), then lock the calibration knob, turn off the measurement switch, take the 11RB4 sample tank, put it in the sample tank to be tested, turn on the measuring switch to read the reflectivity. Note: Selecting switch 3 is suitable for carbon black with a particle size of less than 100nm. When the particle size is greater than! 0cm, the selector switch should be turned to 2.7 Result Expression
After measuring the carbon black reflectivity, take the average of the two measurement results and substitute it into the following empirical equation to calculate the particle size: 1 - 1. 71D26
Wu Zhong I-
Carbon black reflectivity: bzxz.net
Carbon black particle size, nm
Note: When the reflectometer is not calibrated for a period of time or after repair and debugging, the IRR No. 1 industrial standard array reference carbon black should be used to measure the reflector-object diameter system to calibrate this equation.
When other calibration reference carbon black is used, the equation should be recalculated. Permissible difference
GB/T 3780. 17—1995
Permissible difference: The difference between the reflectances of the two measurements shall not exceed 2. Test report
The test report shall include the following contents:
National standard number based on which the test is conducted:
Complete identification of the sample;
The half-mean of the results of the two reflectance measurements: The measured carbon black particle size:
Any difference between the specified steps.
Test date.
Additional remarks:
This standard is proposed by the Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of the Carbon Industry Research and Design Institute of the Ministry of Chemical Industry. This standard was issued by the Carbon Black Industry Research and Design Institute of the Ministry of Chemical Industry. The drafters of this standard are Wang Shoutong and Chen Ningqiu
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