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JG/T 481-2015 English PDF (JGT481-2015)

JG/T 481-2015 English PDF (JGT481-2015)

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JG/T 481-2015: Water-based interior wall coating with low-emission volatile organic compounds (VOC)

This Standard specifies the terms and definitions, classification and marks, requirements, test methods, inspection rules, signs, packaging, transport and storage of water-based interior wall coating with low-emission volatile organic compounds (VOC). This Standard is applicable to water-based coating materials such as paste putty, primer, topcoat, and wood paint used for interior decoration.
JG/T 481-2015
CONSTRUCTION INDUSTRY STANDARD
OF THE PEOPLE REPUBLIC OF CHINA
ICS 91.00
Q 04
Water-based interior wall coating with low-emission
volatile organic compounds (VOC)
ISSUED ON: NOVEMBER 23, 2015
IMPLEMENTED ON: APRIL 01, 2016
Issued by: Ministry of Housing and Urban-Rural Development of the
People's Republic of China
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Terms and definitions ... 5
4 Classification and marks ... 5
5 General requirements ... 6
6 Limits of hazardous substances and requirements for physical properties ... 6 7 Test methods ... 8
8 Inspection rules ... 10
9 Signs, packaging, transport and storage ... 11
Annex A (informative) Substances that shall not be contained in the product 12 Annex B (normative) Test of total volatile organic compounds (TVOC) emission level ... 13
Water-based interior wall coating with low-emission
volatile organic compounds (VOC)
1 Scope
This Standard specifies the terms and definitions, classification and marks, requirements, test methods, inspection rules, signs, packaging, transport and storage of water-based interior wall coating with low-emission volatile organic compounds (VOC).
This Standard is applicable to water-based coating materials such as paste putty, primer, topcoat, and wood paint used for interior decoration.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 3186, Paints varnishes and raw materials for paints and varnishes - Sampling
GB/T 6682, Water for analytical laboratory use - Specification and test methods
GB/T 8170-2008, Rules of rounding off for numerical values and expression and judgement of limiting values
GB/T 9750, Marks for package of coating products
GB/T 9756-2009, Synthetic resin emulsion coatings for interior wall
GB/T 9780-2013, Test Method for Dirt Pickup Resistance and Stain Removal of Film of Architectural Coatings and Paint
GB 11614, Flat glass
GB/T 13491-1992, General rule for packing of coatings
GB/T 15608, The Chinese color system
shall not consider dilution ratio. For two- or multi-component wood paints, it shall be determined after mixing according to the specified ratio of the product. Water is not used as a component, and the dilution ratio is not considered in the determination.
7.2 Hazardous substance limits
The hazardous substance limits in paste putty, interior wall primer and interior wall paint shall be in accordance with GB 18582. The hazardous substance limits in wood paint shall be in accordance with GB 24410. Hexavalent
chromium is carried out in accordance with Annex F in GB 24408-2009.
7.3 Hazardous substance emission level
7.3.1 Total volatile organic compounds (TVOC) emission level
Total volatile organic compounds (TVOC) emission level is in accordance with Annex B.
7.3.2 Formaldehyde emission level
The sample preparation of formaldehyde emission level is in accordance with B.3 in Annex B. The sampling size is 10L, in accordance with 7.2 in GB/T 18204.2-2014.
7.4 Physical properties
7.4.1 The properties of paste putty are in accordance with Clause 6 of JG/T 298-2010.
7.4.2 The properties of interior wall primer are in accordance with Clause 6 of JG/T 210-2007.
7.4.3 The properties of interior wall primer are in accordance with Clause 5 of GB/T 9756-2009. The stain resistance of interior wall paint coating is in accordance with Clause 6 of GB/T 9780-2013.
7.4.4 The properties of wood paint are in accordance with Class C decoration paint in GB/T 23999-2009.
7.5 Inspection results
The inspection results are carried out according to the rounding-off comparison method in GB/T 8170-2008.
B.1.1.2 Technical parameters of environmental test cabin
The environmental test cabin shall meet the following technical parameter requirements:
a) The air temperature in the environmental test cabin is 23??C??1??C;
b) The relative humidity of air in environmental test cabin is 50%??5%;
c) The air exchange rate in environmental test cabin is 0.5 times/h ?? 0.01 times/h;
d) The velocity of air near the surface of the sample to be tested is
0.1m/s~0.3m/s;
e) The air leakage in environmental test cabin is less than 5% of air supply; f) The background concentration of total volatile organic compounds (TVOC) is not more than 50??g/m3. The target single pollutant background
concentration in the evaluation is not more than 5??g/m3;
g) The average recovery of toluene and n-dodecane is not less than 80%. B.1.2 Thermal desorption device
It is capable of thermal analysis of adsorption tubes. Its analytical temperature and carrier gas flow rate shall be adjustable.
B.1.3 Gas chromatograph
It is equipped with hydrogen flame ionization detector (FID).
B.1.4 Tenax-TA adsorption tube
It is a glass tube or stainless-steel tube with smooth inner wall. The tube contains 200mg of Tenax-TA adsorbent with a particle size of 0.18mm~0.25mm (60 mesh ~ 80 mesh).
B.1.5 Constant current sampler
The flow shall be stable during sampling. The flow range shall include 0mL/min ~ 500mL/min. The accuracy is ??5%.
B.1.6 Quartz capillary column
The length shall be 60m. The inner diameter shall be 0.25mm. The film
thickness of dimethyl polysiloxane coated in the column shall be 1.00??m (or equivalent type of chromatographic column).
The activation time shall not be less than 30min. Activate until there is no impurity peak.
B.2.3 Program heating steps of gas chromatograph
The initial temperature of the instrument shall be 50??C. Maintain 2min. The heating rate is 8??C/min. When the temperature rises to 250??C, maintain 5min. Then rise to 280??C and maintain 2min.
B.3 Test piece preparation
B.3.1 Specimen preparation
The specimen shall be placed for at least 24h under the test conditions specified in 7.1.2 before the test.
B.3.2 Substrate requirements
The substrate used for hazardous substance emission level test shall be colorless transparent flat glass specified in GB 11614. Test plate size is 200mm ?? 300mm. The test substrate shall be cleaned and dried naturally before the test.
B.3.3 Preparation
B.3.3.1 Paint the specimen evenly on the test substrate. Prepare two
specimens in total. The paint size shall meet the requirements of Table B.1. Table B.1 -- Requirements for test plate
Type Paint size / (g/piece)
Paste putty 60??1
Interior wall primer 8.0??0.2 (color paint); 3.0??0.2 (clear paint)
Interior wall paint 15.0??0.2
Wood paint 9.0??0.2 (color paint); 6.0??0.2 (clear paint)
NOTE: The paint size involved in the test plate making requirements is single paint size. This paint size is only applicable to a 60L environmental test cabin.
B.3.3.2 When preparing specimen, keep the test environment clean and
ventilated to avoid specimen contamination. The paint time for the same test plate shall be greater than 10min. After painting, immediately put the test piece into the environmental test cabin that complies with B.1.1. Place one test piece inside each cabin. Use two cabins for each test.
B.4 Test steps
B.4.1 Determination of cabin background concentration
Close the door of the environmental test cabin that has been cleaned according from the injection valve for chromatographic analysis. Use retention time to determine the nature. Use the peak area to quantify. Use the content of each component (mg) as the abscissa and the peak area as the ordinate to
respectively draw the standard curve and calculate the regression equation. B.4.5.3 During the analysis of test sample, each sample adsorption tube shall be analyzed by the same thermal analytical gas chromatography analysis
method as the standard series. Use retention time to determine the nature. Use the peak area to quantify.
NOTE 1: For the peak that is identified during the test process, it shall use toluene to quantify and calculate.
NOTE 2: When the unknowns are interfering with the determination, it shall select appropriate gas chromatography columns and sampling absorption tubes or adjust the conditions of analysis system to minimize the interference.
B.5 Calculation of test results
B.5.1 Linear regression equation
According to the mass of each organic compound in the standard sample
adsorption tube and the area of the corresponding chromatographic peak, use the least squares fitting to obtain the linear regression equation (B.1). Its linear correlation coefficient shall be greater than 0.995.
Where,
Ai - Chromatographic peak area of component i in the sample adsorption tube; ki - Slope of linear regression equation for component I;
mi - Mass of component i in the sample adsorption tube, in milligrams (mg); bi - Intercept of the linear regression equation of component i on the Y axis. NOTE: Intercept bi shall be as small as possible.
B.5.2 Emission level of components released from air sample
The emission level of each component in the air sample is calculated according to formula (B.2):

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