GB/T 21782 "Powder coatings" is divided into 14 parts, this part is the third part of GB/T 21782. This part is published for the first time. This standard specifies the liquid displacement pycnometer method for determining the density of powder coatings. This method is based on the determination of the mass and volume of the test sample. This part is equivalent to ISO 8130-3:1992 "Powder coatings Part 3: Determination of density by liquid displacement pycnometer method" (English version). GB/T 21782.3-2008 Powder coatings Part 3: Determination of density by liquid displacement pycnometer method GB/T21782.3-2008 Standard download decompression password: www.bzxz.net
GB/T 21782 "Powder coatings" is divided into 14 parts, this part is the third part of GB/T 21782. This part is published for the first time. This standard specifies the liquid displacement pycnometer method for determining the density of powder coatings. This method is based on the determination of the mass and volume of the test sample. This section is equivalent to ISO 8130-3:1992 "Powder coatings - Part 3: Determination of density by liquid displacement pycnometer 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 Part 3 of GB/T 21782.
This part is equivalent to ISO8130-3:1992 "Powder coatings - Part 3: Determination of density by liquid displacement pycnometer method" (English version).
For ease of use, this part has been modified 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);
--- Replace ISO787-10:1981 with ISO787-10:1993;
--- 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 Standardization of Hazardous Chemicals Management (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, China National Institute of Standardization.
Main drafters of this part: Liang Meiqiong, Lin Hongxiong, Mei Jian, Shen Wenjie, Chen Qiang, Chen Gufeng, Peng Subiao, Shen Sujiang, Mao Leilei, Wang Fan, 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 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 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/T21782.2-2008 Powder coatings Part 2: Determination of density by gas comparison pycnometer method (arbitration method) (ISO8130-2:1992, IDT)
ISO787-10:1993 General test methods for pigments and fillers Part 10: Determination of density by pycnometer method
ISO3696:1987 Specification and test methods for water for analytical laboratories

ICS 13.300
National Standard of the People's Republic of China
GB/T 21782.3--2008/1ISO8130-3:1992 Coating powders-
Part 3: Determination of density by liquid displacement pyknometer(IS0 8130-3:1992,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 21782.3—2008/ISO 8130-3:1992GB/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 (IS08130-1:1992, 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, 11) T); Part 1: 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 (ISO8130-6:1992, IDT); - Part 7 : Determination of mass loss during baking (IS08130-7:1992.IDT); Part 8: Evaluation of storage stability of thermosetting powders (ISO8130-8:1994, IDT); Part 9: Sampling (ISO8130-5:1992IDT); Part 10: Determination of deposition efficiency (ISO8130-10:1998, IDT); Part 11: Inclined plane flow test (ISO8130-11:1997, IDT); - Part 12: Determination of compatibility (IS08130-12:1998, IDT); Part 13: Particle size analysis by laser diffraction (ISO8130-13:2001, IDT); Part 14: Terminology (ISC) 8130-14:2004, IDT) This part is the third part of GI/T21782. This part is equivalent to ISO 8130-3: 1992 "Powder coatings Part 3: Determination of density by liquid displacement pycnometer method" (English version). For ease of use, this part has made the following editorial changes: replace "ISO 842: 1984 Sampling of raw materials for paints and varnishes" (ISO 842: 1984 has been obsolete and replaced by ISO 15528: 2000) with GB/T 3186-2006 Paints, varnishes and raw materials for paints and varnishes (ISO 15528: 2000, IDT); replace "ISO 787-10: 1993" with "ISO 787-10: 1981"; replace the comma "," as a decimal point with the 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). This part was drafted by: Guangdong Shan Entry Inspection and Quarantine Bureau, Sinochem Changzhou Coating Chemical Research Institute, Marine Chemical Research Institute, Sinochem Chemical Standardization Institute, Chaobei Shan Entry Inspection and Quarantine Bureau, China National Institute of Standardization. The main drafters of this part are: Liang Meiqiong, Lin Hongxiong, Mei Jian, Shen Wenjie, Chen Qiang, Chen Gufeng, Peng Subiao, Shen Sujiang, Mao Leilei, Wang Fan, Li Qingxiang.
This part is published for the first time.
1 Scope
Powder coatings
GB/T 21782.3—2008/IS0 8130-3:1992 Part 3: Liquid displacement pycnometer method for density determination This part of GB/T 21782 specifies the liquid displacement pycnometer method for determining the density of powder coatings. This method is based on the determination of the mass and volume of the test sample.
The equipment specified in this method is relatively inexpensive, but the liquid displacement pycnometer method may give incorrect results, especially when the powder expands as the displaced liquid is displaced, or when the displaced liquid does not completely displace the air in the powder particles. The liquid displacement method is slower to use and is less accurate than the gas comparison pycnometer method (arbitration method) for density determination in GB/T 21782.2-2008, and this method should only be used when it has been proven that it can produce the same results as the gas comparison pycnometer method. Normative references
The provisions of the following documents become provisions of this part through reference to this part of GB/T 21782. For any dated referenced document, all subsequent amendments (excluding errata) or revisions are not applicable to this part, however, parties to agreements based on this part are encouraged to investigate whether the latest versions of these documents can be used. For any undated referenced document, the latest version applies to this part.
GB/T31862006 Sampling of paints, varnishes and raw materials for paints and varnishes (ISO15528:2000, IDT) GB/T21782.2-2008 Powder coatings Part 2: Determination of density by gas comparison pycnometer method (arbitration method) (ISO8130-21992, IDT3
IS0787-10:1993 General test methods for pigments and fillers Part 10: Determination of density - Pycnometer method IS03696:1987 Specification and test methods for water for analytical laboratories 3 Principle
To determine the density of powder coatings by liquid displacement pycnometer method (pycnometer complies with ISO787-10:1993), the liquid used should be able to completely wet the sample and not Make the sample swell or dissolve. 4 Materials
Newly distilled and cooled, its technical indicators should at least meet the requirements of Grade III water specified in ISO3696:1987. 4.2 Displacement liquid
Aliphatic hydrocarbons or mixtures of aliphatic hydrocarbons that do not contain aromatic compounds, with a boiling point range of 80℃～140℃. In many examples, n-heptane has been found to be suitable for determining the density of thermosetting powder coatings, but if n-heptane can react with the sample or one of its components, other suitable liquids should be used.
4.3 Acetone
Analytical absolute.
5 Instruments
5.1 Pycnometer
Should comply with the requirements of ISO787-10:1993.
GB/T21782.3-2008/IS0 8130-3:19925.2 Vacuum pump
Connect the rubber pressure-resistant tube.
5.3 Balance
Range 200 g, accurate to 1 mg,
6 Sampling
Draw representative samples of the test product according to the provisions of GB/T3186-2006. 7 Operating steps
Repeat the measurement twice at 23℃±0.5℃, accurate to 1 mg. 7.1 Determination of density of displaced liquid
First weigh in a clean empty specific gravity bottle (5.1), add the displaced liquid (4.2) to the scale, weigh again, empty the specific gravity bottle, clean it with acetone (4.3) three times, dry it in a vacuum, and add water (4.1) again. ) Pour into a pycnometer and weigh again. Use formula (1) to calculate the density of the displacing liquid at 23°C, el, expressed in g/mL: m:-moXPn
Where:
Mass of the empty pycnometer, in grams (g) bzxZ.net
Mass of the pycnometer filled with the displacing liquid, in grams (g); Mass of the pycnometer filled with water, in grams (g); . ()
Density of water, in grams per milliliter (g/nL). (Under the conditions of this force method, the density of water at 23°C can be used as 0.998 g/ml.)
7.2 Determination of the density of powder coatings
Empty the pycnometer, wash it three times with acetone, and dry it under vacuum. Place 3 to 4 g of the sample in the pycnometer and weigh it. Add enough replacement liquid to wet the sample and cover the sample. Connect the outlet of the pycnometer to the pressure-resistant tube (5.2) of the vacuum pump. Reduce the pressure in the pycnometer to 1.2 kPa while vibrating it until no more gas escapes from the powder/liquid mixture. Carefully raise the pressure of the pycnometer to atmospheric pressure, and then fill the pycnometer to the mark with the replacement liquid. Be careful not to stir the settled powder. Be careful when filling the liquid to avoid powder being retained at the neck of the pycnometer. Reweigh the mass of the fully loaded pycnometer. 8. Representation of results
8.1 Calculation
Calculate the density P of the powder wood coating at 23°C according to formula (2), expressed in g/mL: ms-mo
P,= (mt-mo)=(m-ms)×pt
The mass of the pycnometer, in grams (g);
-the mass of the pycnometer plus the displacement fluid, in grams (g); the mass of the pycnometer plus the sample, in grams (g); the mass of the pycnometer plus the sample and the displacement fluid, in grams (g); m
P--the density of the displacement fluid at 23°C, in grams per milliliter (g/mL). (2
If the difference between the two measurement results is greater than 0.04 g/mL, re-determine according to (7.2). Calculate the average of the two valid determinations and retain the result to two decimal places.
Precision
GB/T 21782.3—2008/1SO 8130-3:1992 Currently there are only limited precision data. As a rule of thumb, reproducibility can be determined as 0.05 g/mL. 9
Test report
The test report shall include at least the following: a)
All the details necessary to identify the product under test; indication of this standard number;
Type of pycnometer and replacement fluid used; test results (data for each test and average); any deviation from the specified test method; test date.
GB/T 21782. 3-2008
Xuanhua People's Government
National Standard
Powder coatings
Part 3: Determination of density by liquid displacement pycnometer methodCB/T 21782. 3
2008/IS08130-3.1992
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