GB/T 21782 "Powder coatings" is divided into 14 parts, this part is the 10th part of GB/T 21782. This part is published for the first time. This standard specifies the method for determining the mass fraction of powder actually deposited on a standard target tube when powder is sprayed on a target tube with an electrostatic spray gun under standard conditions. This method is applicable to powder coatings that are applied using corona charging or friction charging. This method is only used for comparison during continuous evaluation of powders or spray guns, because the influence of the environment and equipment varies significantly with time and geographical location to a large extent. This part is equivalent to the international standard ISO8130-10:1998 "Powder coatings Part 10: Determination of deposition efficiency" (English version). GB/T 21782.10-2008 Powder coatings Part 10: Determination of deposition efficiency GB/T21782.10-2008 standard download decompression password: www.bzxz.net
GB/T21782 "Powder coatings" is divided into 14 parts, this part is the 10th part of GB/T21782. This part is published for the first time. This standard specifies the method for determining the mass fraction of powder actually deposited on a standard target tube when the powder is sprayed on the target tube with an electrostatic spray gun under standard conditions. This method is applicable to powder coatings that are applied by corona charging or friction charging. This method is only used for comparison during continuous evaluation of powders or spray guns, because the influence of environment and equipment varies significantly with time and geographical location to a large extent. This part is equivalent to the international standard ISO8130-10:1998 "Powder coatings Part 10: Determination of deposition efficiency" (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: Particle size analysis by laser diffraction (ISO8130-13:2001, IDT);
---Part 14: Terminology (ISO8130-14:2004, IDT). This part
is Part 10 of GB/T 21782.
This part is equivalent to the international standard ISO8130-10:1998 "Powder coatings Part 10: Determination of deposition efficiency" (English version).
For ease of use, the main editorial changes made to this part of ISO8130-10:1998 are as follows:
--- 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 Dangerous Chemicals Management (SAC/TC251).
The main drafting units of this part: Guangdong Entry-Exit Inspection and Quarantine Bureau, Sinochem Chemical Standardization Research Institute, Sinochem Changzhou Coating Chemical Research Institute, Marine Chemical Research Institute, Hubei Entry-Exit Inspection and Quarantine Bureau.
The main drafters of this part: Chen Qiang, Zhai Cuiping, Wang Xiaobing, Mo Man, Zhou Minghui, Chen Gufeng, Zheng Jianguo, Zhao Ling, Wang Shicai, Zhang Jianfeng, Li Qingxiang. This part
is published for the first time.
The provisions in the following documents become the provisions of this part through reference in this part of GB/T 21782. For dated references, 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 undated references, the latest versions apply to this part.
ISO8130-9:1992 Powder coatings - Part 9: Sampling

1CS 13.300
National Standard of the People's Republic of China
GB/T 21782.10—2008/ISO 8130-10:1998 Powder coatings
Part 10: Determination of deposition efficiency
Coating powders
Part 1O :Determination of deposition efficiency(ISO 8130-10.1998,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
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GB/T21782.10—2008/IS08130-10:1998GB/T21782 《Powder coatings》is divided into 14 parts, structure The international standards it corresponds to are as follows: Part 1: Determination of particle size distribution by sieving (ISO813011992, 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, 11)T); Part 5: Powder/air mixtures Determination of flow properties (IS8130-5: 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 (ISO8130-7: 1992, IDT); Part 8: Evaluation of storage stability of thermosetting powders (ISO8130-8: 1994, IDT); Part 9: Sampling (ISO8130-9: 1992, 1D1 ); Part 10: Determination of deposition efficiency (IS08130-10:1998, IDT); - Part 11: Tilt flow test (ISO8130-11:1997, 1DT); - Part 12: Determination of compatibility (ISO8130-12:1998IDT); Part 13, Particle size analysis by laser diffraction method (1ISO8130-13:2001, IDT); Part 14: Terminology (ISO8130-14:2004, IDT). This part is Part 10 of GB/T21782. This part is equivalent to the international standard 1S08130-10:1998 "Powder coatings Part 10: Determination of deposition efficiency" (English version). For ease of use, the main editorial changes made to this part of IS08130-10:1998 are: the decimal point ", " is used instead of the logical sign " as a decimal point; the foreword of the international standard is deleted.
This part is proposed and managed by the National Technical Committee for Standardization of Hazardous Chemicals Management (SAC/TC251). The main drafting units of this part are: Guangdong Entry-Exit Inspection and Quarantine Bureau, Sinochem Chemical Standardization Research Institute, Sinochem Changzhou Coating Chemical Research Institute, Marine Chemical Research Institute, Hubei Entry-Exit Inspection and Quarantine Bureau. The main drafters of this part are: Chen Qiang, Zhai Cuiping, Wang Xiaobing, Mu, Zhou Minghui, Chen Gufeng, Zheng Jianguo, Zhao Ling, Gong Gancai, Zhang Jianfeng, Li Qingxiang.
This part is published for the first time.
1 Scope
Powder coatings
GB/T 21782.10—2008/IS0 8130-10 1998 Part 10: Determination of deposition efficiency
This part of GB/T 21782 specifies the method for determining the mass fraction of powder actually deposited on a standard target tube when the powder is sprayed on the target tube with an electrostatic spray gun under standard conditions. This method is applicable to powder coatings that are applied using corona charging or friction charging. This method can be used to compare the deposition efficiency of different powders with the same spray gun or different spray guns with the same powder. This method should only be used for comparison during continuous evaluation of powders or spray guns, because the influence of environment and equipment varies significantly with time and geographical location.
The results of this method depend on the following properties of the powder: a) chemical composition, b) density, c) particle size distribution; d) particle shape; e) fluidity of its mixture in air; f) moisture. The results also depend on the test conditions. Includes: a) spray shape produced by the spray gun; b) spray gun air pressure; c) spray gun voltage; d) spray gun polarity; c) air humidity. 2 Normative references
The clauses in the following documents become clauses of this part through reference in this part of G13/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 investigate whether the latest versions of these documents can be used. For any undated referenced document, the latest version applies to this part.
ISO8130-9:1992 Powder coatings Part 9: Sampling 3 Terms and definitions
The following terms and definitions apply to this part. 3.1
Deposition efficiency deposition efficiency The ratio of the mass of powder deposited to the mass of powder sprayed, expressed as a mass fraction (%). 4 Principle
This method specifies that under known atmospheric temperature and humidity conditions, charged powder is sprayed at a known flow rate on one of five identical steel tubes covered with aluminum foil, the mass of powder deposited on the middle steel tube is measured, and the deposition rate is calculated from this. The operation should be carried out in a fume hood.
Used laboratory apparatus and the following equipment: 5.1 Target device
It consists of 5 steel tubes with an inner diameter of 25 mm and a length of 500 mm. A hole is drilled at one end of each tube so that the tube can be hung vertically. Each tube should be properly grounded.
5.2 Clean aluminum foil
Commercially available product.
GB/T21782.10—2008/ISO8130-10:19985.3 Suspension device
Enables 5 steel pipes to be hung vertically and equidistantly side by side, with the center distance between the pipes being 95mm~105mm.5.4 Vacuum cleaning bag
5.5 Oven
Capable of melting powder coating.
5.6 Balance
Accurate to 0.1g.
5.7 Timer
Accurate to 0.1s.
5. 8 Powder spraying system
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Includes a corona charged spray gun or friction charged spray gun properly installed in a fume hood and a suitable powder collection device. 5.9 The insulating shield or powder collecting device shall be large enough to prevent the powder sprayed from the spray gun from contacting the steel pipe before the test, and flexible enough to be removed during the test. 6 Sampling The sampling shall be carried out in accordance with ISO 8130-9:1992. The recommended sample size is 2 kg. 7 Operating procedures 7.1 Test the samples in duplicate at a temperature of 23 °C ± 2 °C and a relative humidity of 20% to 70%. Due to the large amount of air passing through the fume hood during the test, it is not possible to control the air temperature and humidity within the exact range. In this case, the temperature and humidity range should be indicated in the test report. 7.2 Wrap the five steel pipes with a lead box and fold the top and bottom edges of the lead box into the box to ensure good electrical contact. Weigh the aluminum foil used for the intermediate tube on a balance to the nearest 0.1 g. 7.3 Determine the powder flow rate: Spray the powder into a pre-weighed clean vacuum bag in the powder spraying system. Use a timer to control the spraying time to 60 s. Weigh the clean bag with powder to the nearest 0.1 g and calculate the powder flow rate in grams per minute. a) When using a corona charging spray gun, adjust the control valve of the powder spraying device to achieve a powder flow rate of 150 g/min ± 7.5 g/min. Note: It is important to turn off the high voltage during this operation. b) When using a triboelectric spray gun, adjust the delivery air pressure to 300 kPa (≈3 bar) and determine the powder flow rate as described in the first paragraph of 7.3.
7.4 Place the suspension device with 5 steel tubes in the spray cabinet. 7.5 Install and adjust the spray gun in the fume hood so that it is aimed at the center of the middle steel pipe. The distance between the spray gun and the steel pipe should be such that the sprayed powder does not cover about 60% of the length of the middle steel pipe. Record the distance. Ensure that the air velocity through the opening of the fume hood is 0.4m/s~～1.0m/, and the air flow direction is parallel to the spray direction. When using a narrow cone spray gun, it may be difficult to cover 60% of the length of the steel tube with powder. Record any differences in the test report. 7.6 Place the insulating shield (5.9) between the spray gun and the steel tube: 7.7 Turn on the powder spray switch. When using an electric lift charged spray gun, adjust the voltage so that the voltage of the appropriate electrode of the actual spray gun is 60kV ± 1 kV.
Note: At this point, there is an opportunity to test different voltages to make a more in-depth evaluation of the equipment and powder. 7.8 Remove the insulating shield and allow the powder to spray steadily on the steel tube without fluctuation for 60s ± 0.5s. When the time is up, immediately place the shield between the spray gun and the boiler tube. Turn off the spray gun.
7.9 Carefully remove the intermediate steel tube from the suspension device without covering any powder and place it in an oven adjusted to a certain temperature. The oven temperature should be such that the powder melts within 5min to 10min. 2
Do not allow the powder coating to go through a curing process as this may result in mass loss. GB/T 21782.10--2008/IS0 8130-10:19987.10 Remove the steel tube with aluminum foil from the oven and allow it to cool. Remove the aluminum foil from the tube and weigh it to the nearest 0.1 g. Note: To avoid powder loss, the foil can be removed from a weighed plastic press. 8.1 Calculate the deposition efficiency E according to formula (1) and express it in mass fraction (%): E = mp×60
Where:
mp-mass of powder deposited on the aluminum foil, in grams (g); t-powder spraying time, in seconds (s);
P,-powder flow rate, in grams per minute (g/min). 8.2 If the absolute difference between the results of two parallel tests is not greater than 5% of the smaller value, calculate and report the arithmetic mean. If the absolute difference between the results of two parallel tests exceeds 5% of the smaller value, conduct a third test and report the arithmetic mean of the three results. If the difference between the third test result and the mean of the first two tests is also greater than 5%, state this in the test report and report each test result.
The results are rounded to one decimal place.
9Precision
Experience shows that the precision of powder flow rate determination is ± 3%. The precision of ± 5% can be achieved using corona charging and triboelectric spray guns. 10 Test report
The test report shall contain at least the following:
a) all the details necessary to identify the product tested: identification number of this standard;
type of powder;
particle size distribution (if any);
density of powder (if any);
complete description of the powder spraying equipment including
1) for corona charging spray guns, the actual gun voltage or voltages (see note to 7.7) and the electrodes used; 2) for tribocharging spray guns, the air pressure delivering the powder; 3) description of the nozzle;
4) powder flow rate;
distance between the nozzle and the target steel tube;
air velocity at the fume hood opening;wwW.bzxz.Net
temperature and relative humidity of the air entering the fume hood (see 7.1);
test results obtained in accordance with 8.2;
any deviation from the specified test method; date of test.
GB/T 21782. 10-2008
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National Standard of the People's Republic of China
Powder coatings
Part 10, Determination of deposition efficiency
GB/T 21782.10—2008/ISO 8130-10:1998*
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