GB/T 21782 "Powder coatings" is divided into 14 parts, this part is the second part of GB/T 21782. This part is published for the first time. This standard specifies the method of measuring the density of powder coatings by gas comparison pycnometer. This method is applicable to all types of powder coatings. The test is very simple, but compared with the commonly used density test methods, this method requires more complex instruments. This part is equivalent to ISO 8130-2:1992 "Powder coatings Part 2: Determination of density by gas comparison pycnometer (arbitration method)" (English version). GB/T 21782.2-2008 Powder coatings Part 2: Determination of density by gas comparison pycnometer (arbitration method) GB/T21782.2-2008 Standard download decompression password: www.bzxz.net
GB/T 21782 "Powder coatings" is divided into 14 parts, this part is the second part of GB/T 21782. This part is published for the first time. This standard specifies the method for determining the density of powder coatings using a gas comparison pycnometer. This method is applicable to all types of powder coatings and the test is very simple, but compared with the commonly used density test methods, this method requires a more complex instrument. This part is equivalent to ISO 8130-2:1992 "Powder coatings Part 2: Determination of density by gas comparison pycnometer (arbitration method)" (English version).
class="f14" style="padding-top:10px; padding-left:12px; padding-bottom:10px;"> 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 properties of powder/air mixtures (ISO 8130-5:1992, 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 (ISO8130-11:1997, 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 second part of GB/T 21782.
This part is equivalent to ISO8130-2:1992 "Powder coatings Part 2: Determination of density by gas comparative pycnometer method (arbitration method)" (English version).
For ease of use, the main editorial changes made to this part of ISO8130-2:1992 are as follows:
--- Replace ISO842:1984 Sampling of raw materials for paints and varnishes with GB/T3186-2006 Sampling of paints, varnishes and raw materials for paints and varnishes (ISO15528:2000, IDT) (ISO842:1984 has been obsolete and replaced by ISO15528:2000);
--- Add reference to GB/T21782.3-2008 in the normative references;
--- Replace the comma as a decimal point with a decimal point.;
--- Delete the foreword of the international standard.
This part is proposed and managed by the National Technical Committee for the Administration of Hazardous Chemicals Standardization (SAC/TC251).
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.
Main drafters of this part: Chen Gufeng, Shen Wenjie, Chen Qiang, Zhou Wei, Zhai Cuiping, Zheng Jianguo, Liang Meiqiong, Shen Sujiang, Qian Yemiao, Cui Hairong, 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 agreements 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/T21782.3-2008 Powder coatings Part 3: Determination of density by liquid displacement pycnometer method (ISO8130-3:1992, IDT)

ICS13.300
National Standard of the People's Republic of China
GB/T21782.2—2008/ISO8130-2:1992 Coating powders-
Part 2: Delermination of density by gas comparison pyknomcter(referee method)
(ISO 8130-2:1992, IDT)
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
GB/T 21782.2—2008/1SO 8130-2:1992CB/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, DT); 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 (ISO) 8130-4:1992IDT); Part 5: Flow characteristics of powder/air mixtures Part 10: Determination of the deposition efficiency of thermosetting powders (ISO8130-10: 1998, IDT); Part 11: Determination of the mass loss during baking (ISO8130-7: 1992, IDT); Part 12: Determination of the deposition efficiency of thermosetting powders (ISO8130-8: 1994, IDT); Part 13: Determination of the deposition efficiency of thermosetting powders (ISO8130-5: 1992, IDT); Part 14: Determination of the gel time of thermosetting powder coatings at a given temperature (ISO8130-6: 1992, IDT); Part 15: Determination of the mass loss during baking (ISO8130-7: 1992, IDT); Part 16: Determination of the deposition efficiency of thermosetting powders (ISO8130-8: 1994, IDT); Part 17: Determination of the mass loss during baking (ISO8130-7: 1992, IDT); Part 18: Determination of the mass loss during baking (ISO8130-8: 1994, IDT); Part 19: Determination of the mass loss during baking (ISO8130-8: 1994, IDT); Part 20: Determination of the mass loss during baking (ISO8130-8: 1994, IDT); Part 21: Determination of the mass loss during baking (ISO8130-8: 1994, IDT); Part 22: Determination of the mass loss during baking (ISO8130-8: 1994, IDT); Part 23: Determination of the mass loss during baking (ISO8130-8: 1994, IDT); Part 24: Determination of the mass loss during baking (ISO8130-8: 1994, IDT); Part 25: Determination of the Part: Inclined plane flowability test (IS08130-11: 1997, IDT); Part 12: Determination of compatibility (IS08130-12: 1998, IDT); Part 13: Laser beam analysis of particle size (ISO8130-13: 2001, IDT); - Part 14: Terminology (ISO8130-14: 2001 IDT) This part is (Part 2 of HI3/T21782. This part adopts IS08130-2: 1992 Powder Coatings Part 2, Gas Comparative Density Measurement Method (Arbitration Method) 3 (English Version), ||tt| |For ease of use, the main editorial changes made to this part of ISO8130-2:1992 are as follows: - Replace ISO842:1984 Sampling of raw materials for paints and varnishes with GB/T3186-2006 Paints, varnishes and paints and varnishes (ISO15528.2000, IDT) (ISO842:1981 has been obsolete and replaced by ISO15528:2000);
Add reference to GB/T21782.32008 in the normative references; Replace the comma as a decimal point with a decimal point ";
Delete the foreword of the international standard.
This part was proposed and managed by the National Technical Committee for Standardization of Hazardous Chemicals Management ($AC/IC251). This part was drafted by Guangdong Exit-Entry Inspection and Quarantine Bureau, Sinochem Changzhou Coating Chemical Research Institute, Marine Chemical Research Institute, Sinochem Chemical Standardization Institute, Hubei Exit-Entry Inspection and Quarantine Bureau. The main drafters of this part are Chen Gufeng, Shen Wenjie, Chen Qiang, Zhou Wei, Zhai Cuiping, Zheng Jianguo, Liang Meiqiong, Shen Sujiang, Qian Yemiao, Cui Hairong, Li Qingxiang.
This part is published for the first time.
1 Scope
Powder coatings
GB/T21782.2—2008/IS08130-2:1992 Part 2: Determination of density by gas comparison pycnometer (arbitration method)
This part of GB/T21782 specifies the method for determining the density of powder coatings by gas comparison pycnometer. This method is applicable to all types of powder coatings and the test is simple, but compared with the methods commonly used to test density, this method requires complex instruments. The density of powder coatings is also measured by the liquid displacement pycnometer method described in GB/T21782.3-2008. The instrument of this method is relatively simple, but the liquid displacement pycnometer method is prone to erroneous results. In particular, there are two situations: one is that the displacement liquid used contacts the powder coating and causes the powder coating to swell; the other is that the displacement liquid cannot completely replace the air between the powder coating particles. The liquid displacement pycnometer method is slow and has low accuracy. It can only be used when it can obtain the same results as the gas comparison pycnometer method. 2 Normative references
The clauses in the following documents become the clauses of this part through reference to this part of GB/T21782. For all referenced documents with a date of reference, 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 referenced documents without a date of reference, the latest versions apply to this part.
GB/T31862006 Sampling of paints, varnishes and raw materials for paints and varnishes (ISO15528.2000, IDT) GB/T21782.3—2008 Powder coatings Part 3: Determination of density by liquid displacement pycnometer method (ISO8130-3:1992, IDT)
3 Principle
When the sample is added to the measuring container, the volume of the weighed sample is calculated from the volume of the gas displaced in the measuring container. The pressure difference caused by the gas displacement is balanced to obtain the volume of the displaced gas. The density is then calculated from the mass and volume of the sample. 4 Materials
4.1 Air
If required, use nitrogen, stored in cylinders, industrial grade. Other gases may be used if the test product is not affected and the deviation of the method is noted in the H test report. 5 Instruments
5.1 Gas Comparative Density Instruments
For manual or automatic density determination, the following requirements shall be met. The basic design of a typical gas comparative density instrument using air as the medium is shown in Figure 1. It consists of two cylinders (A and B) with pistons of exactly equal size. A valve and a differential pressure gauge are connected between the cylinders. The sample contained in a 50 mL beaker is placed in cylinder B. The two pistons move with equal ranges, resulting in a pressure difference between cylinders A and B. The measuring piston in cylinder B is then moved to regain equal pressure. The resulting volume change is read from the scale as the sample volume. The measured cylinder gas exchange capacity shall be shown to be equal within a range of 0.5% (relative value). The intervals between the measured volumes indicated on the scale shall not be greater than 1% of the measured volume. The scale calibration shall be carried out by placing a reference standard of known volume with traceability in the instrument. 1
GB/T21782.2—2008/IS08130-2:1992 For routine calibration, only two reference standards of different volumes are required; however, for initial calibration, at least five reference standards of different volumes are required to ensure that the scale has a linear relationship over its entire scale range. Note: Several manufacturers can provide suitable gas comparison specific gravity instruments. Stopper
Differential pressure gauge
Mixer cup
Reference piston
Flush valvebzxz.net
Connecting valve
Testing plug
Volume-dependent variation
Figure 1 Schematic diagram of the structure of a gas comparison specific gravity instrument 6 Sampling
Take representative samples of the test product in accordance with the provisions of GB/T3186--2006. 7 Operating steps
Parallel measurements should be carried out at 23℃ + 1℃ and 50% ± 5% relative humidity. Adjust the instrument according to the manufacturer's instructions, taking into account the volume of the beaker, and check the instrument to ensure that there are no leaks. Weigh the empty beaker containing the sample to the nearest 1g. Fill the beaker with the test product, making sure that no powder sticks to the outer wall of the beaker. Weigh the beaker containing the sample to the nearest 1mg to obtain the mass of the sample (m). Place the beaker with the sample in the instrument and determine the volume of the sample according to the instructions provided by the manufacturer. Repeat the volume measurement to ensure consistency of the readings.And calculate the average of the two volumes (V). Note: If the gas is dry, a small change in density can be observed in the dry medium of the test part. If the difference between the two readings is greater than 2%, the result is discarded.
8 Expression of results
Use formula (1) to calculate the density of the powder coating at 23°C in g/mL: Pr=
Where:
Sample mass, in grams (g);
V---Sample volume, in milliliters (mL) If the difference between the two measurements is greater than 0.04 g/mL, re-measure as described in the operating steps. Calculate the average of the two valid measurements and report the result to the nearest 0.01 g/mL. 2
Precision
Precision data are not yet available.
Test report
The test report shall at least include the following contents: a)
All the detailed information necessary to identify the tested product; indicate the number of this part;
The model of gas comparative pycnometer and the gas used: test results (values ​​of each parallel test and the average value); any deviation from the prescribed test method; test month and date.
GB/T 21782.2--2008/IS0 8130-2:1992GB/T 21782. 2-2008
National Standard of the People's Republic of China
Powder coatings
Part 2: Determination of density by gas comparison pycnometer method (arbitration method)
GB/T 21782. 2—2008/ISO 8130-2:1992Published and distributed by China Standards Press
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