GB/T 34675-2017 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 34675-2017 | English | 155 |
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Determination of volatile organic compound (VOC) content in radiation curable coatings
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GB/T 34675-2017: Determination of volatile organic compound (VOC) content in radiation curable coatings
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT34675-2017
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 87.040
G 50
Determination of volatile organic compound (VOC)
content in radiation curable coatings
Issued on. NOVEMBER 01, 2017
Implemented on. NOVEMBER 01, 2018
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of PRC.
Table of Contents
Foreword... 3
1 Scope... 4
2 Normative references... 4
3 Terms and definitions... 5
4 Principle... 5
5 Equipment... 6
6 Samples... 7
7 Test procedure... 7
8 Test data processing... 9
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard was proposed by the China Petroleum and Chemical Industry
Federation.
This standard shall be under the jurisdiction of the National Standardization
Technical Committee for Coatings and Pigments (SAC/TC 5).
Drafting organizations of this standard. CNOOC Changzhou Coating Chemical
Research Institute Co., Ltd., Zhejiang Youqian Special Materials Co., Ltd.,
Guangzhou Kinte Material Technology Co., Ltd., Fujian Product Quality
Inspection and Research Institute, Sichuan Jiabaoli Coating Co., Ltd.,
Shenzhen Guangtian Environmental Coating Co., Ltd., Hezhong (Foshan)
Chemical Co., Ltd., Sankeshu Coating Co., Ltd., Guangdong Xigui Light Curing
Material Co., Ltd., Guangzhou Biaogeda Laboratory Equipment Co., Ltd.,
Guangdong Eneng Nano Technology Co., Ltd.
The main drafters of this standard. Zhou Xiangling, Ji Junhong, Chen Mengru,
Zhang Jie, Li Jie, Ye Caiping, Wu Yong, Peng Yongsen, Wu Yong, Kang Lunguo,
Xu Junqiang, Wang Chongwu, Xiao Qiaobing.
Determination of volatile organic compound (VOC)
content in radiation curable coatings
1 Scope
This standard specifies the terms and definitions, principles, equipment,
samples, experimental procedures, test data processing for determining the
content of volatile organic compounds (VOC) in radiation curable coatings.
This standard applies to the determination of volatile organic compound (VOC)
content in coatings cured by radiation curing methods such as ultraviolet light
(UV) and electron beam (EB). UV curing and electron beam curing inks and
adhesives can also refer to this standard.
2 Normative references
The following documents are essential to the application of this document. For
the dated documents, only the versions with the dates indicated are applicable
to this document; for the undated documents, only the latest version (including
all the amendments) is applicable to this standard.
GB/T 3186 Paints varnishes and raw materials for paints and varnishes -
Sampling
GB/T 5206-2015 Paints and varnishes - Terms and definitions
GB/T 6750 Paints and varnishes - Determination of density - Pycnometer
method
GB/T 6753.4-1998 Paints and varnishes - Determination of flow time by use
of flow cups
3 Terms and definitions
The following terms and definitions apply to this document.
3.1
Volatile organic compound content; VOC content; VOCC
The mass of the volatile organic compounds in the paint measured under
the specified conditions.
3.2
Ultraviolet curing; UV curing
The hardening process of a paint exposed to ultraviolet radiation.
3.3
Electron beam curing; EB curing
The process of rapid curing of the specially formulated coatings by a beam
of concentrated electrons.
4 Principle
After preparing the specimen, use an appropriate method to determine the non-
volatile content of the specimen under specified conditions according to the
type of specimen.
5 Equipment
5.1 Metal flat-bottom dish
The diameter is (75 ± 5) mm and the edge height is 5 mm or it can ensure that
the specimen does not overflow. It is also possible to use dishes of different
diameters. At this time, use formula (1) to calculate the mass m of the specimen
used for the test, unit in gram (g).
5.2 Syringe
Disposable syringe with a capacity of 1 mL.
5.3 Oven
Warning - In order to prevent explosion or fire, samples containing volatile
substances shall be handled with care and shall be implemented in
accordance with relevant national regulations.
5.4 Dryer
Packed with a suitable desiccant, such as dry silica gel impregnated with cobalt
chloride.
5.5 Balance
The accuracy is 0.1 mg.
6 Samples
Take sample according to the provisions of GB/T 3186, or according to the
agreed method; the sampling volume is determined according to the inspection
needs.
7 Test procedure
7.1 Non-volatile content
7.1.1 Do three tests in parallel.
7.1.2 Degreasing and cleaning metal flat-bottom dishes (see 5.1). In order to
improve the measurement accuracy, the dish (see 5.1) is baked in an oven (see
5.3) at (110 ± 2) °C for 30 minutes before the test and placed in a desiccator
(see 5.4).
7.1.4 Weigh the mass m0 of the metal flat-bottom dish (see 5.1), accurate to 0.1
mg. Weigh (0.2 ± 0.1) g of the specimen to be tested (see 7.1.3) into a dish (see
5.1) and spread it evenly, accurate to 0.1 mg.
7.1.5 Immediately after the weighing, immediately transfer the metal flat-
bottomed dish (see 5.1) containing the specimen into oven (see 5.3); heat it at
(50 ± 2) °C for 30 min.
7.1.7 After radiation curing, transfer the dish into an oven (see 5.3) at (110 ±
2) °C and heat it for 60 minutes. After the heating time is over, place the dish in
a desiccator (see 5.4) to cool and weigh the mass m2 of the specimen residue
and the dish, accurate to 0.1 mg.
8 Test data processing
8.1 General
Calculate the volatile organic compound (VOC) content of the specimen
according to the method specified in the standard. Since calculation method 1
does not involve the measurement of density (other errors will be introduced),
it has better precision and is a preferred calculation method.
8.2 Calculation method 1
The volatile organic compound (VOC) content w (VOC) (mass fraction) of the
specimen is calculated according to formula (3).
8.3 Calculation method 2
The volatile organic compound (VOC) content ρ (VOC) of the specimen is
calculated according to formula (4).
8.4 Calculation method 3
The volatile organic compound (VOC) content ρ (VOC) 1w of the specimen after
deducting moisture is calculated according to formula (5).
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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