GB/T 21782 "Powder coatings" is divided into 14 parts, and this part is the first part of GB/T 21782. This part is published for the first time. This standard specifies the method for determining the particle size distribution of powder coatings by sieving method. This method can distinguish particles in the range of 32μm~300μm. This method can also be used as a simplified operation procedure, that is, only a single sieve is used for the sieve residue (pass/fail) test. This part is equivalent to ISO8130-1:1992 "Powder coatings Part 1: Determination of particle size distribution by sieving method" (English version). GB/T 6005-1997 quoted in Chapter 2 of this part is equivalent to the international standard ISO565:1990, and there is no technical difference in the quoted part. GB/T 21782.1-2008 Powder coatings Part 1: Determination of particle size distribution by sieving method GB/T21782.1-2008 standard download decompression password: www.bzxz.net
GB/T21782 "Powder coatings" is divided into 14 parts, this part is the first part of GB/T21782. This part is published for the first time. This standard specifies the method for determining the particle size distribution of powder coatings by sieving method. This method can distinguish particles in the range of 32μm~300μm. This method can also be used as a simplified operation procedure, that is, only a single sieve is used for the sieve residue (pass/fail) test. This part is equivalent to ISO8130-1:1992 "Powder coatings Part 1: Determination of particle size distribution by sieving method" (English version). GB/T 6005-1997 cited in Chapter 2 of this Part is equivalent to the international standard ISO 565:1990, and there is no technical difference in the quoted parts.
GB/T21782 "Powder Coatings" is divided into 14 parts, the structure and its corresponding international standards are as follows:
--- Part 1: Determination of particle size distribution by sieving method (ISO81301:1992, IDT);
--- Part 2: Determination of density by gas comparison pycnometer method (arbitration method) (ISO81302:1992, IDT);
--- Part 3: Determination of density by liquid displacement pycnometer method (ISO81303:1992, IDT);
--- Part 4: Calculation of lower explosion limit (ISO81304:1992, IDT);
--- Part 5: Determination of flow characteristics of powder/air mixtures (ISO81305:1992, IDT);
---Part 6: Determination of gel time of thermosetting powder coatings at a given temperature (ISO 8130-6:1992, IDT);
---Part 7: Determination of mass loss on baking (ISO 8130-7:1992, IDT);
---Part 8: Evaluation of storage stability of thermosetting powders (ISO 8130-8:1994, IDT);
---Part 9: Sampling (ISO 8130-9:1992, IDT);
---Part 10: Determination of deposition efficiency (ISO 8130-10:1998, IDT);
---Part 11: Inclined plane flow test (ISO 8130-11:1997, IDT);
---Part 12: Determination of compatibility (ISO8130-12:1998, IDT);
---Part 13: Analysis of particle size by laser diffraction (ISO8130-13:2001, IDT);
---Part 14: Terminology (ISO8130-14:2004, IDT).
This part is the first part of GB/T 21782.
This part is equivalent to ISO8130-1:1992 "Powder coatings Part 1: Determination of particle size distribution by sieving method" (English version).
GB/T 6005-1997 quoted in Chapter 2 of this part is equivalent to the international standard ISO565:1990, and there is no technical difference in the quoted parts.
Appendix A of this part is an informative appendix.
This part is proposed and managed by the National Technical Committee for Standardization of Dangerous Chemicals Management (SAC/TC251).
The drafting units of this part: Guangdong Entry-Exit Inspection and Quarantine Bureau, Sinochem Changzhou Coating Chemical Research Institute, Marine Chemical Research Institute, Sinochem Chemical Standardization Institute, Hubei Entry-Exit Inspection and Quarantine Bureau. The
main drafters of this part: Li Zhengjun, Xiao Dahui, Zhang Junxi, Zhou Minghui, Zhao Quan, Zhai Cuiping, Zhang Zhenkun, Shen Sujiang, Qian Yemiao, Guo Jian, Li Qingxiang.
This part is published for the first time.
The clauses in the following documents become the clauses of this part through reference in this part of GB/T 21782. For all dated referenced documents, all subsequent amendments (excluding errata) or revisions are not applicable to this part. However, parties to an agreement based on this part are encouraged to study whether the latest versions of these documents can be used. For all undated referenced documents, the latest versions apply to this part.
GB/T3186-2006 Sampling of paints, varnishes and raw materials for paints and varnishes (ISO15528:2000, IDT)
GB/T6005-1997 Basic dimensions of mesh openings for test sieves of wire mesh, perforated plates and electroformed sheets (eqvISO565:1990)

ICS13.300
National Standard of the People's Republic of China
GB/T 21782.1—2008/ISO 8130-1:1992 Coating powders - Part 1: Determination of particle size distribution by sieving(ISO 8130-1:1992,IDI)
Published on 2008-05-12
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China Administration of Standardization of the People's Republic of China
Implemented on 2008-09-01
National Standard of the People's Republic of China
Powder coatings - Part 1: Determination of particle size distribution by sieving
GB/T 21782.1—2008/1SO 8130-1:1992*
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GB/T 21782.1-2008/ISO 8130-1:1992GB/T21782 "Powder coatings\ is divided into 14 parts, the structure and its corresponding international standards are as follows: Part 1: Determination of particle size distribution by sieving method (ISO8130-1:1992, IDT); Part 2: Determination of density by gas comparison pycnometer method (arbitration method) (ISO8130-2:1992, IDT) Part 3: Determination of density by liquid displacement pycnometer method (1SO8130-3:1992, IDT); Part 4: Calculation of lower explosion limit (ISO8130-4:1992, 2DT); Part 5: Determination of flow characteristics of powder/air mixtures (ISO8130-5:1992, ID)T); Part 6: Determination of gel time of thermosetting powder coatings at a given temperature (ISO8130-6:1992, ID T); - Part 7: Determination of mass loss during baking (ISO8130-7: 1992, IDT); - Part 8: Evaluation of storage stability of thermosetting powders (ISO8130-8: 1991, IDT); - Part 9: Defective samples (ISO8130-9: 1992, IDT); - Part 10: Determination of deposition efficiency (ISO8130-10: 1998, IDT; Part 11: Inclined plane flow test (ISO8130-11: 1997) T); Part 12: Determination of compatibility (ISO8130-12: 1998, IDT); Part 13: Analysis of particle size by laser diffraction method (ISO8130-13: 2001, IIT); Part 14: Terminology (ISO8130-14: 2004, IIDT). This part is the first part of GB/T21782. This part is equivalent to TSO8130-1:1992 "Powder coatings Part 1: Determination of particle size distribution by sieving method" (English version). GB/T60051997 cited in Chapter 2 of this part is equivalent to the international standard ISO565:1990, and there is no technical difference in the cited parts.
Appendix A of this part is an informative appendix.
This part is proposed and managed by the National Technical Committee for the Management of Hazardous Chemicals (SAC/TC251). The drafting units of this part: Guangdong Shanren Entry-Exit Inspection and Quarantine Bureau, Sinochem Changzhou Coatings Chemical Research Institute, Haifu Chemical Research Institute, Sinochem Chemical Standardization Institute, Hubei Entry-Exit Inspection and Quarantine Bureau. The main drafters of this part: Li Zhengjun, Xiao Dabian, Zhang Junxi, Zhou Minghui, Zhao Quan, Zhai Cuiping, Zhang Zhenkun, Shen Sujiang, Qian Yemiao, Guo Jianli Qingxiang.
This part is published for the first time.
1 Scope
Powder coatings
GB/T21782.1—2008/IS08130-1:1992 Part 1: Determination of particle size distribution by sieving
This part of GB/T21782 specifies the method for determining the particle size distribution of powder coatings by sieving. This method can distinguish the particle size in the range of 32μM to 300um.
This method can also be used as a simplified operation procedure, that is, only a single sieve is used for the sieve residue (pass/fail) test. 2 Normative references
The clauses in the following documents become the clauses of this part through reference in this part of GB/T21782. For any dated referenced document, all subsequent amendments (excluding errata) or revisions are not applicable to this part, however, parties to an agreement based on this part are encouraged to study whether the latest versions of these documents can be used. For any undated referenced document, the latest version of the document applies to this part.
GB/T3186-2006 Sampling of paints, varnishes and raw materials for paints and varnishes (ISO15528.2000.1DT) GB/T60051997 Test sieves Basic size of wire mesh, perforated plate and electroformed sheet, sieve holes (egvISO5651990)
3 Only instruments
3.1 Test sieve: A mesh with a sieve surface diameter of 200mm. The sieve wall and mesh of the test sieve should be metal, and the sieve hole diameter should be between 32μm and 300μm, and meet the requirements of GB/T6005--1997 (see Appendix A). The test sieve should have a transparent cover. The choice of sieve holes will depend on the actual situation. If the particle size distribution of the sample is known, only the test sieve that is suitable for the particle size range needs to be used. For a specific month, it is also allowed to select the test sieve in an agreed manner to obtain sufficient data, which is agreed upon by the relevant parties. 3.2 Airflow sieve device (see Figure 1): It consists of a cylindrical body with a test sieve (3.1). Cover
Jingkongtai
One-guar force meter
Air flow screen
Air inlet rotary injector
At the bottom of the cylinder (connected to the exhaust fan, there should be a recess and an inlet for air flow in and out. The air inlet is connected to an air jet device with a speed of 20r/min~25t/min, which is composed of a sharp slit nozzle. This inlet and outlet should be installed close to the screen longitudinally at the bottom of the screen 7
GB/T 21782.1—2008/ISO 8130-1: 1992. When the jet device rotates, the air flow passes through the screen continuously from below to prevent the powder coating particles from clogging the test screen. The air flow is discharged through the outlet, and smaller particles are taken away through the sieve. The air flow can be controlled by adjusting the gap at the outlet. 3.3 Timer (such as stopwatch): can record up to 15 or less hours. A circuit breaker can be connected between the air screen and the motor. 3.4 Balance accurate to 0. 01 g.
3.5 Wooden hammer: A light-weight wooden hammer with a plastic head, suitable for knocking off powder attached to the device. 3.6 Magnifying glass: At least 5 times magnification. 3.7 Ultrasonic cleaning.
4 Sampling
Take a representative sample of the test product in accordance with the provisions of GB/T3186·2006. 5 Preparation of test sieve
5.1 Use a magnifying glass (3.6) to check whether the test sieve is clean and has no damage. The sieve should not be blocked by the material measured last time. 5.2 If the test sieve needs to be cleaned, use an ultrasonic cleaner (3.7) to clean it. Wash. 6 Operation steps
Perform duplicate parallel tests
6.1 Weigh the test sieve (3.1) with a transparent cover to an accuracy of 0.01 g. 6.2 Weigh 20 g of the material to be screened to an accuracy of 0.01 g (if the sieve aperture of the material to be screened is less than 90 μIm, weigh 10 g of the material to be screened).
6.3 Ensure that the selected test sieve is fixed on the airflow screen device (3.2) and transfer the material to be screened to the test sieve. 1. Cover the transparent cover, reduce the opening force of the system to 2 kPa above 0.3 kPa and start rotating the nozzle. Unless otherwise specified.Otherwise, the instrument shall be operated for 300 s ± 15 s. If it can be demonstrated that the ultrafine powder passes through the test sieve within 180 ± 15 s, this shorter sieving time may be used and shall be noted in the test report. If any material adheres to the sieve wall or transparent cover, it shall be knocked gently with a wooden hammer (3.5) to knock off the adhering powder. Note: If it is difficult to sieve ultrafine material, 0.2% (based on the original sample mass of the material to be sieved) of a suitable ultrafine sieving aid (burned silica or alumina) may be added to the material to be sieved to assist sieving. Since the added material will pass through the sieve, it is not necessary to correct its mass. 6.4 At the end of the test, allow the air pressure to slowly reach equilibrium with the pressure in the chamber. Remove the cover and weigh the test sieve with the sieve residue to the nearest 0.01 g.
6.5 To determine the particle size weight distribution, first measure the mass of the sieve residue on the selected minimum aperture test sieve. Then, according to the aperture size of the test sieve, select the test sieve from small to large within the specified range (see 3.1), and repeat the measurement according to the new material to be screened according to the operation steps 6.1 to 6.4.
7 Representation of results
Calculate the sieve residue on each test sieve according to formula (1) and express it as mass fraction w(%): (ma-ma)× 100
Where:
na is the mass of the test sieve and transparent cover, in grams (g); m is the mass of the material to be screened, in grams (g); m2 is the mass of the test sieve, transparent cover and sieve residue after sieving, in grams (g). If the difference between the two measurements is greater than 3% (absolute value), repeat the operation according to the provisions of Chapter 6. (1)
Calculate the average of the two valid measurements and report the result to the nearest integer. The results of a series of measurements 2
with test sieves of different sizes can be reported in tabular form or in graphical form. CB/T21782.1-2008/IS08130-1:1992 Note: When presenting the results in a graph, it is recommended to use the Rosin-Rammler-Sperling-Bennett (RRST3 graph) to plot the data. Extrapolation for too low or too high particle sizes can lead to questionable results. (RRSI is one of the statistical methods for particle size distribution. More detailed information can be found in various technical documents on particle size distribution analysis).
Precision
Precision data have not yet been obtained. bzxZ.net
Test report
The test report should include at least the following: all the details necessary to identify the product under test; a
Indicate the number of this part:
Results for each test sieve;
d) Any differences from the specified test method; e)
Test period.
CB/T 21782.1--2008/1SO8130-1:1992 Appendix A
(Informative Appendix)
Screen aperture size of test sieve
Screen aperture size of test sieve is shown in Table A.1 (cited from GB/T6005-1997). Screen aperture size of test sieve
Screen support diameter/um
R10/3 series
GB/T 21782. 1-2008
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