This standard specifies the method for determining the mass loss of powder coatings applied to substrates by electrostatic spraying during baking. GB/T 21782.7-2008 Powder coatings Part 7: Determination of mass loss during baking GB/T21782.7-2008 Standard download decompression password: www.bzxz.net
This standard specifies the method for determining the mass loss of powder coatings applied to substrates by electrostatic spraying during baking.
class="f14" style="padding-top:10px; padding-left:12px; padding-bottom:10px;"> GB/T21782 "Powder Coatings" consists of 14 parts. The expected 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 comparative pycnometer 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 7 of GB/T 21782.
This part is equivalent to the international standard ISO8130-7:1992 "Powder coatings Part 7: Determination of mass loss during baking" (English version).
Compared with ISO8130-7:1992, the following editorial changes have been made to this part:
--- This part replaces this part of ISO8130;
--- GB/T3186-2006 Paints, varnishes and raw materials for paints and varnishes Sampling (ISO15528:2000, IDT) replaces ISO842:1984 Raw materials for paints and varnishes Sampling;
--- GB/T3186-2006 replaces ISO842;
--- The comma as a decimal point is replaced by a decimal point.;
--- The foreword of the international standard is deleted.
This part replaces GB/T16592-1996 "Determination of mass loss of powder coatings during baking".
Compared with GB/T16592-1996, the main changes of this part are as follows:
---Add Appendix A of this part as a normative appendix in the preface. And the content about the structure of GB/T21782 series standards;
---Replace ISO842:1984 with GB/T3186-2006;
---Delete Appendix B;
---Written according to the requirements of GB/T1.1-2000, and the expression of some clauses has been modified.
Appendix A of this part is a normative appendix.
This part is under the jurisdiction of the National Technical Committee for Standardization of Paints and Pigments (SAC/TC5).
The main drafting units of this part: Guangdong Entry-Exit Inspection and Quarantine Bureau, Sinochem Changzhou Paint Chemical Research Institute, Marine Chemical Research Institute, Sinochem Chemical Standardization Institute, Hubei Entry-Exit Inspection and Quarantine Bureau.
The main drafters of this part are: Chen Qiang, Zhai Cuiping, Mo Man, Zhou Wei, Chen Gufeng, Zheng Jianguo, Peng Subiao, Zhao Ling, Cui Hairong, Wang Guirong, Li Qingxiang. The
previous versions of the standards replaced by this part are: GB/T16592-1996.
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, the 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 applies to this part.
GB/T3186-2006 Sampling of paints, varnishes and raw materials for paints and varnishes (ISO15528:2000, IDT)

National Standard of the People's Republic of China
TB/T 21782.72008/ISO 8130-7:1992 replaces GB/T165921995
Powder coatings
Part 7:Determination of loss of mass on stoving(ISO 8130 7:1992,JDT)
Published on 2008-06-19
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
Implementation on 2009-02-01
GB/E 21782.7—2008/1ISO 8130-7: 1992T2782 "Powders and Polyesters" consists of 11 parts, and the international standards to which they are based 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 ratio instrument method (ISO8139-2: 1992, IDT); - Part 3: Determination of density by liquid displacement ratio method (IS08130-3: 1992, IDT); - Part 4: Calculation of lower explosion limit (ISO8130-4: 1902, IDT); Part b: Determination of flow characteristics of powder/gas mixtures (IS0813C-5: 1992.IDT); - Part 6: Determination of gelation time of thermosetting powders at a given temperature (IS0813G-6: 1 - Part 7: Determination of mass loss during baking (ISO8130-7: 1992, IDT); - Part 8: Evaluation of storage stability of thermosetting powders (ISO81308.1991.1DT); - Part 9: Sampling (IS08130-: J552, IDT); - Part 10: Determination of deposition efficiency (ISO813010: 998, JIDT); - Part 1I: Inclined plane flow test (IS0) 8130-11997, II) T); - Part 12: Determination of interpenetration (ISO8130-12: J098, IDT); - Part 13: Particle size analysis by optical diffraction method (IS08.3013: 2001, IDT); - Part 14: Terminology (IS0 8130-14: 20041DT). This part is part 7 of GB/T 21782. The part is equivalent to ISO 81307:1992 Powder coatings Part 7: Determination of the amount of tipping during baking (English: This part has made the following editorial revisions compared with ISO 8130-7:1592: "This part of ISO 8130" is replaced by "this part"; -- replace "ISO 842:1984 Sampling of raw materials for paints and varnishes" with GB3/T 3186-2005 Paints, varnishes and paints and varnishes (IS15528:2000, JDT) and replace "ISO 842:1984 Sampling of raw materials for paints and varnishes" with GB3/T 3186-2006. 842"\;- Decimal point "\ replaces the numeral "\; Delete the foreword of the international standard.
In part, GB/T16592-1996* Determination of mass loss of powder coating during baking% Compared with (G13/T16592-1996), the main changes of this part are as follows. Add "Appendix A of this part is a normative appendix" in the foreword and the contents of the structure of the GB/T21782 series of standards;
Month\(F13/1 186
2006\Replacement\1S0842:1984"
II. Delete the Guangdong Appendix;
Written in accordance with the requirements of GB/1.1-2000. Modify the expression of some clauses of this part. Appendix A of this part is a normative appendix.
This part is standardized by the National Standardization Technical Committee for Paints and Materials (SAC/TC5). In the section, the starting point is: Guangdong Exit-Entry Inspection and Quarantine Bureau, Changzhou Coatings Chemical Research Institute, Marine Chemical Research Institute, Sinochem Chemical Research Institute, Hubei Exit-Entry Inspection and Quarantine Bureau. The ten drafters of this part are: Chen Qiang, Que Cuiping, Dian Man, Zhou Fang, Zi Gufeng, Zheng Jianguo, Peng Subiao, Zhao Ling, Cui Hairong, Wang Guirong, Li Qingxiang. The versions of the standards replaced by this part are as follows: (3/165921996T
1 Scope
Powder coatings
G3/1 21782.7—7008/S0 8130-7:1992 Part 7: Determination of mass loss during baking This part specifies the method for determining the mass loss during baking of powder coatings applied to substrates by electrostatic spraying! Juice 1: The method described in this part is a simple and practical test method that can give sufficiently accurate results for powder coatings with a weight loss of less than 2% (mass fraction) during baking. Beyond this range, the precision decreases with increasing mass loss. Note 2: Water in the test product will be included in the calculation results. 2 Normative references
The following documents have become the terms of this part through reference to this part of GB/T 21782. For dated references, all subsequent amendments (excluding dated contents) or revisions do not apply 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 of these documents apply to this part.
GB/T 3189C96 1
Sampling of paints, varnishes and raw materials for paints and varnishes (ISO: 55282000.IDT) 3 Necessary supplementary information
For specific applications, the test methods specified in this part require additional complete information. The supplementary information is given in Appendix A.
4 Apparatus
Ordinary laboratory instruments and the following instruments
4.1 Flat bottom III
75mm. The size requirements are not very strict, but the bottom of the blood should be flat to ensure good contact effect of the iron or aluminum diameter
and to spread the test sample of the powder into a uniform thin layer (the thickness of the powder can have a significant impact on the test results),
4.2 Air circulation oven
Can be kept at a constant temperature of 250℃. The type of oven should be stated in the test report, as the design of the oven can affect the test results. 4.3 Analytical balance
Accurate to 0.1:
4.1 Dryer
Without desiccant, such as cobalt chloride, for drying glue 5 Samples
Take representative samples of the test product according to the provisions of GI3/T31862006. 6 Operating procedures
Use two samples for parallel testing.
6.1 Test specimens
Put the flat bottom M (4.1) in the oven (4.2) at the specified or agreed test temperature (see Appendix A) for 7 hours, and place it in a dryer to cool to the test temperature. Weigh the flat bottom M to an accuracy of 0.11g. Then, with the same accuracy, weigh 0.50g of the upper 0.05 sample (m) with a flat bottom, hold the flat bottom gently, and slowly move the sample to spread evenly on the bottom. Note: The 0.5 sample can be formed into a thin layer of about 6m in the upper diameter 75t bottom: 6.2 Determination
Baking is carried out according to the specified or agreed temperature and time (see Appendix A): Place the bottom containing the sample (G.1) in a pre-adjusted oven (4.2) to an appropriate temperature for the specified or agreed time. To help obtain the effect of rapid heat conduction, place the flat bottom on a metal plate at the baking temperature in the oven. When the heating time is completed, transfer the flat bottom to a desiccator and cool to room temperature. Weigh the flat bottom and the baked sample to an accuracy of C.1 and obtain the mass of the baked sample (ml). Note: During the melting of powder, the powder in the oven may be blown out by the wind of the air ring oven. The wind should be turned off for a short time at the beginning of the test.
7 Expression of results
Calculate the mass loss (w) during baking according to the formula (), expressed as mass fraction (%): ri = msm mi x ICC
Where:
m.---the mass of the sample before baking, in grams (g); m\--the mass of the sample after baking, in grams (g). If the difference between the results of two parallel tests is greater than 0,2%, the test shall be repeated according to the method described in Chapter 6. Calculate the average of the two valid determinations.
8 Precision
H No case data available.
Test notification
The test report shall contain the following contents:
a) All the details necessary to identify the product under test: indicate the number of this part;
Provide supplementary information in accordance with Appendix A;
Type of oven used;
Test results (single measured values ​​and average information);
Any deviation from the specified test method;
Test period,
Appendix A
(Normative Appendix)
Necessary supplementary information
The supplementary information listed in this appendix shall be provided for tests carried out according to this method. The information should preferably be agreed upon by the relevant parties and may be obtained (in part or in whole) from an international or national standard or other document related to the product under test.
a) Baking temperature;
Baking time,
GB/T 21782. 7-2008
National Standard of the People's Republic of China
Powder coatings
Part 7: Determination of mass loss during baking GB/T 21782.72003/1SO 813-7:1992 Published and distributed by China Standard Press
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