This standard specifies one of the general test methods for determining the pigment sieve residue by mechanical flushing. This method is applicable to pigments or extenders dispersed in water, and can also be used for other powders or particles insoluble in water. It is not applicable to pigments and extenders that are difficult to wet or granulated into balls. GB/T 5211.14-1988 Determination of relative tinting strength and punch color of coloring pigments Visual comparison method GB/T5211.14-1988 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Determination of residue on sieve of pigment
Mechanical flushing procedure
Determination of residue on sieve of pigment-Mechanical flushing procedureUDC 667.622
GB 5211.14-88
This standard is equivalent to ISO787/18-1983 "General test methods for pigments and extenders-Part 18: Determination of sieve residue-Mechanical flushing procedure".
1 Subject content and scope of application
This standard specifies one of the general test methods for determining the sieve residue of pigment by mechanical flushing procedure. This method is applicable to pigments or extenders dispersed in water, and can also be used for other powders or particles insoluble in water. It is not applicable to pigments and extenders that are difficult to wet with water or granulated into balls. Note: When this general method is applicable to a specific pigment or extender, it is sufficient to include a reference to this method in the product standard of the pigment or extender and indicate the changes required by the characteristics of the product. Only when this general method is not applicable to a specific product should a special method be specified to determine the sieve residue.
2 Reference Standards
GB9285 Sampling of Raw Materials for Paints and Varnishes 3 Definitions
Sieve residue (R): The ratio of the mass of coarse particles retained on a sieve with a specified sieve aperture to the mass of the sample when tested according to this standard, expressed as a percentage.
4 Principle
In the test device, the test pigment or extender dispersed in water is centrifugally moved by a rotating water flow. The water washes the fine particles through the sieve, and the coarse particles remain on the sieve. The coarse particles on the sieve are weighed after drying. 5 Materials
5.1 Tap water: filtered and pressurized to 300±20kPa. Note: The water can be pressurized by pump, or it can be stored in a closed tank and pressurized by compressed air, cylinder nitrogen or carbon dioxide. 1) 5.2 Wetting agent: such as 95% (V/V) ethanol or sulfonate, etc., used to wet pigments and extender pigments that are difficult to wet with water. The selection of wetting agent should be agreed upon with the parties concerned and explained in the test report. 6 Instruments
Common laboratory instruments and the following instruments:
6.1 Mechanical flushing device (see figure): It consists of the following components. Instructions for use:
1) There is no such note in the international standard.
Approved by the Ministry of Chemical Industry of the People's Republic of China on April 19, 1988
Free download of industry information
Implementation on January 1, 1989
6.1.1 Containers
Test sieve
GB 521114-88
Test (flap type)
Mechanical flushing device
1—protective cover, 2—driving motor, 3—cover, 4—handle and overflow pipe, 5—container, 6—sprinkler, 7—nozzle, 8—sieve, 9—sieve seat, 10—water spray port, 11—hollow shaft, 12—water supply pipe, 13—feeding funnel, upper cover: composed of protective cover, driving motor, hollow shaft, spray head, water supply pipe, feeding funnel, handle and overflow pipe. There are two spray holes with a diameter of 1±0.2mm on the hollow shaft, 6.1.2
, and three spray holes with a diameter of 1±0.2mm at the bottom of the spray head. Note: When operated under the specified pressure and spray diameter, the water flow rate is about 5L/min. It is recommended to check the spray hole diameter regularly. The calcium deposits in the water nozzle should be dissolved by chemical substances that do not corrode the nozzle material. Mechanical means should not be used. 1210
Free download of marking industry information
GB5211.14-88
6.1.3 Sieve: A test sieve made of phosphor bronze or stainless steel is stretched on a metal or plastic frame. Note: ① A sieve with three baffles can also be used. The function of the baffles is to disperse the aggregated particles. ② A 45μm sieve is usually used. The sieve should be checked frequently to check whether the sieve is damaged. ③ If a sieve with a plastic frame is used, the softening point of the selected plastic should be higher than the temperature used for drying the sieve residue. Before the first use, it should be dried at 105℃ to a constant weight.
6.1.4 Sieve seat.
6.2 Oven: The temperature can be maintained at 105±2℃. 6.3 Balance: Accurate to 0.1mg.
6.4 Lower desiccant: Contains effective desiccant.
7 Operation steps
Two samples should be tested in parallel.
Test samples
Take representative samples of the test pigments according to GB9285. Weigh a certain amount of sample m, accurate to 0.1%, and place it in a beaker of appropriate volume. The sample size is generally 5-50g. When there is little residue on the sieve, the sample size is increased, but not more than 300g.
7.2 Preparation of dispersion 1)
Add an appropriate amount of water to the beaker, add a wetting and dispersing agent (Article 5.2) to the water, stir well, and add the sample. Stir with a magnetic stirrer or an electric glass stirrer for 30 minutes to disperse the sample into a free-flowing suspension. Note: If the pigment can be well wetted and dispersed in water, it is not necessary to add a wetting and dispersing agent. 7.3 Determinationwww.bzxz.net
7.3.1 Turn on the motor of the mechanical flushing device (Article 6.1) and adjust the water pressure to 300±20kPa. Slowly transfer the dispersion (7.1) into the device through the funnel and rinse the beaker and funnel with water. Continue rinsing for 10 minutes, breaking up the agglomerates with a fast stream of water and flushing the fine particles through the sieve. If the running water is hard, rinse the device with distilled water at the end. Note: For some pigments, it is not necessary to continue rinsing for 10 minutes to make the water flowing through the sieve clear. The rinsing time can be determined by preliminary tests. If the rinsing time is less than 10 minutes, it should be stated in the test report. 7.3.2 Turn off the motor and then cut off the water flow. Remove the sieve from the rinsing device and transfer it to a 105±2℃ oven (6.2) to dry for 1 hour. After cooling in a dryer (6.4), weigh it to the nearest 0.1 mg (m2). Brush off the sieve residue with a fine brush and weigh the mass of the empty sieve (m2).
Note: If the melting point of the sieve residue is lower than 110℃, a lower drying temperature should be used and stated in the test report. 7.3.3 If the absolute value difference between the parallel test results exceeds 0.1%, the above steps should be repeated. If the difference between the two results of the repeated operation still exceeds 0.1%, the four measured values ​​should be stated in the test report as a check for product non-uniformity. 7.4 Check the sieve residue
Check whether there is incompletely dispersed pigment in the sieve residue. If there is incomplete dispersion, use another wetting and dispersing agent and repeat the entire operation steps (Chapter 7).
Result expression
Calculate the sieve residue of the mechanical flushing method according to the following formula: R=-ml=m2×100
In the formula: R—-sieve residue expressed in mass percentage. Instructions for use:
1) The steps for preparing the dispersion are different from those of the international standard. 1211
奇米免费
mo——sample mass, gs
m——mass of sieve residue, g,
m2—mass of empty sieve, g.
GB 5211.14-88
If the result is less than 0.01%, the result shall be expressed as "less than 0.01%" Test report
The test report shall at least include the following contents:
Type and name of the test pigment,
Test results expressed in accordance with Chapter 8,
Aperture of the sieve used:
Sample size,
Name and quantity of the wetting and dispersing agent used, type and state of the sieve residue,
Difference from the prescribed operation,
Test date.
Additional notes:
This standard is under the jurisdiction of the National Technical Committee for Standardization of Paints and Pigments. This standard was drafted by the Paint Industry Research Institute of the Ministry of Chemical Industry. The main drafter of this standard is Zhu Yang.
Marking degree thin network
Free download of various marking industry materials
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.