GB/T 4468-1984 Determination of dispersion stability of disperse dye suspensions

This standard applies to the determination of dispersion stability of disperse dye suspensions. The determination method is to place a suspension of a certain concentration of the sample in a cylindrical glass separatory funnel, and after a certain period of rest, measure the absorbance of the acetone solution of the upper and bottom suspensions to calculate the dispersion stability of the sample suspension, expressed as a percentage. GB/T 4468-1984 Determination of dispersion stability of disperse dye suspensions GB/T4468-1984 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Disperse dye suspensions
Test method for the dispersion stability of disperse dye suspensions
L; DC 667.21:535bzxz.net
GB 4468—84
This standard is applicable to the determination of dispersion stability of disperse dye suspensions. The determination method is to place a suspension of a certain concentration of the sample in a simple glass separatory funnel. After a certain period of rest, the absorbance of the acetone solution of the upper and lower total suspensions is measured to calculate the dispersion stability of the suspension of the sample, which is expressed as white fraction. 1 Materials and instruments
1.1 Shanghai-produced No. 1546 glass separatory funnel: maximum volume 60 liters. 1.2 Photoelectric spectrophotometer: 721 photoelectric spectrophotometer or other similar performance brands. 1.3 Magnetic stirrer.
1.4 Pipette: 2, 5 ml.
1.5 Glass beaker: 50, 150, 250 ml. 1.6 Volumetric flask: 51, 200 ml.
2 Reagents and solutions
2.1 Reagent specifications shall comply with the relevant provisions of GB2374-80 "General conditions for dye staining determination". 2.2 Acetone-water mixture: Prepare at a volume ratio of 7:3. 2.3 Preparation of dye suspension:
Take the preparation of a suspension with a dye concentration of 30 g/ml as an example, the method is as follows: Accurately weigh 1.5 g of the dye sample (weighing to 0.001 g), put it in a 150 ml beaker and beat it with a little water, then add 30=40 ml of water, transfer it to a 50 ml graduated flask, and dilute it to the scale with water. Transfer to a beaker, place on an electric magnetic stirrer, stir at room temperature for 10 minutes, then transfer to a cylindrical separatory funnel, let stand for 4 hours and then use. 8 Test method
After standing for 4 hours, take 5 ml of the suspension from about 6 mm below the upper liquid space of the cylindrical separatory funnel with a pipette, transfer to a 200 ml volumetric flask and dilute with water to the scale. Then open the piston and put about 10 ml of the lower layer of suspension into a 50 ml beaker, use a pipette to take 5 ml of it and put it into a 200 ml volumetric flask, and dilute with water to the scale. Shake the above sample evenly, use a pipette to take the required milliliters and transfer them to a 50 ml volumetric flask, mix and dilute with water to the scale. Use a photoelectric spectrophotometer and select an appropriate wavelength to measure the absorbance. The stability of the suspension (theoretical) is calculated as follows: B× 100
Where: A→
Absorbance of the diffused liquid in the lower layer!
Absorbance of the diffused liquid in the upper layer.
Issued by the National Bureau of Standards on June 5, 1984
Implemented on March 61, 1985
Additional explanation,
GB4468-84
This standard was proposed by the Ministry of Chemical Industry of the People's Republic of China and is under the jurisdiction of Shenyang Chemical Industry Research Institute. This standard was drafted by Shanghai Dyestuff Research Institute. The main drafters of this standard are Zhang Ruixiang and Chen Ru.
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