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GB 18581-2020 (GB18581-2020)

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GB 18581-2020: PDF in English
GB 18581-2020
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 87.040
G 51
Replacing GB 18581-2009, GB 24410-2009
Limit of Harmful Substances of Woodenware Coatings
ISSUED ON: MARCH 04, 2020
IMPLEMENTED ON: DECEMBER 01, 2020
Issued by: State Administration for Market Regulation;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative References ... 5
3 Terms and Definitions ... 6
4 Product Classification ... 7
5 requirements ... 8
6 Test Methods ... 11
7 Inspection Rules ... 13
8 Packaging Mark ... 14
9 Implementation of Standard ... 15
Appendix A (Normative) Determination of Moisture Content – Gas
Chromatography ... 16
Bibliography ... 20
Limit of Harmful Substances of Woodenware Coatings
1 Scope
This Standard specifies the product classification, requirements, test methods,
inspection rules, packaging marks and implementation of the standards involved in the
allowable limits of substances harmful to humans and the environment in woodenware
coatings.
This Standard is applicable to all types of woodenware coatings for on-site and factory
coatings such as filler, primer and topcoat except for special functional coatings such
as Lacquer, bridging paint, wood stain, open effect paint, etc.
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) are applicable to this document.
GB/T 1725-2007 Paints Varnishes and Plastics – Determination of Non-Volatile-
Matter Content
GB/T 3186 Paints Varnishes and Raw Materials for Paints and Varnishes –
Sampling
GB/T 6682-2008 Water for Analytical Laboratory Use - Specification and Test
Methods
GB/T 6750-2007 Paints and Varnishes - Determination of Density - Pycnometer
Method
GB/T 8170-2008 Rules of Rounding off for Numerical Values & Expression and
Judgement of Limiting Values
GB/T 9750 Marks for Package of Coating Product
GB/T 9754-2007 Paints and Varnishes - Determination of Specular Gloss of Non-
Metallic Paint Films at 20°, 60°and 85°
GB/T 18446-2009 Binders for Paints and Varnishes - Determination of Monomeric
Diisocyanate in Isocyanate Resins
GB/T 23985-2009 Paints and Varnishes - Determination of Volatile Organic
Compound (VOC) Content - Difference Method
GB/T 23986-2009 Paints and Varnishes - Determination of Volatile Organic
Compound (VOC) Content - Gas-Chromatographic Method
GB/T 23990-2009 Determination of the Contents of Benzene, Toluene,
Ethylbenzene, and Xylene in Coatings by Gas Chromatography
GB/T 23991-2009 Determination of Soluble Harmful Elements Content of
Coatings
GB/T 23992-2009 Determination of Chlorohydrocarbon Content in Coatings - Gas
Chromatographic Method
GB/T 23993-2009 Determination of Formaldehyde Content of Waterborne
Coatings -Spectrophotometric Method with Acetylacetone
GB/T 30646-2014 Determination of Phthalate Plasticizers Content in Coatings -
Gas Chromatography/Mass Spectrometry Method
GB/T 30647-2014 Determination of Harmful Elements Total Content of Coatings
GB/T 31414-2015 Water Based Coatings - Determination of Surfactant -
Alkylphenol Ethoxylates
GB/T 34675-2017 Determination of Volatile Organic Compound (VOC) Content in
Radiation Curable Coatings
GB/T 34682-2017 Determination of Volatile Organic Compound (VOC) Content in
Reactive Diluent Containing Coatings
GB/T 36488-2018 Determination of Polycyclic Aromatic Hydrocarbons in Coatings
3 Terms and Definitions
For the purpose of this document, the following terms and definitions apply.
3.1 Polyurethane coatings
A type of coating that uses polyurethane resin formed by the reaction of polyisocyanate
and active hydrogen-containing compound as the main film-forming material.
3.2 Nitrocellulose coatings
6 Test Methods
6.1 Sampling
Sampling according to the provisions of GB/T 3186, or according to the agreed method.
The sampling amount is determined according to the inspection requirements.
6.2 Test methods
6.2.1 VOC content
6.2.1.1 Density
Perform according to the provisions of GB/T 6750-2007; the test temperature is
(23±0.5) °C.
6.2.1.2 Luster
Perform according to the provisions of GB/T 9754-2007. Use a wet film preparation
device with a groove depth of (100 ± 2) µm to prepare a sample plate on a flat glass
plate. The varnish shall use black glass or flat glass with a matte black paint on the
back as the substrate. After drying the sample plate for 48h at a temperature of
(23±2) °C and a relative humidity of (50±5) %, test it with a 60° specular gloss meter.
6.2.1.3 Moisture content
Perform according to the provisions of Appendix A.
6.2.1.4 VOC content in solvent-based coatings (polyurethane, nitrocellulose,
alkyd and their corresponding fillers)
The non-aqueous solvent-based paint shall be carried out in accordance with the
provisions of GB/T 23985-2009. The non-volatile content is carried out in accordance
with the provisions of GB/T 1725-2007. Weigh about 1g of the sample and the baking
condition is (105±2) °C/1h. The moisture shall not be measured, the moisture content
is set to zero. The calculation of VOC content is carried out according to 8.3 of GB/T
23985-2009.
Solvent-based coatings intentionally added with water shall be carried out in
accordance with the provisions of GB/T 23985-2009. The non-volatile content is
carried out in accordance with the provisions of GB/T 1725-2007. Weigh about 1g of
the sample and the baking condition is (105±2) °C/1h. The calculation of VOC content
is carried out according to 8.4 of GB/T 23985-2009.
6.2.1.5 VOC content in solvent-based coatings (unsaturated polyester and its
filler)
6.2.5 Total sum content of glycol ether and ether ester
Perform according to the provisions of GB/T 23986-2009. The calculation of the
content of glycol ether and ether ester is carried out according to 10.2 in GB/T 23986-
2009; and converted into milligrams per kilogram (mg/kg).
6.2.6 Benzene content, total sum content of toluene and xylene (including
ethylbenzene)
Perform according to the Method A specified in GB/T 23990-2009. The calculation of
benzene content, toluene and xylene (including ethylbenzene) content are carried out
according to 8.4.3 of GB/T 23990-2009.
6.2.7 Total sum content of benzene series
Perform according to the Method B specified in GB/T 23990-2009. The calculation of
benzene series content is carried out according to 9.4.3 of GB/T 23990-2009.
6.2.8 Total sum content of polycyclic aromatic hydrocarbons
Perform according to the provisions of GB/T 36488-2018.
6.2.9 The total sum content of free diisocyanate
Perform according to the provisions of GB/T 18446-2009.
6.2.10 Methanol content
Perform according to the provisions of GB/T 23986-2009. The calculation of methanol
content is carried out according to 10.2 of GB/T 23986-2009.
6.2.11 Total sum content of halogenated hydrocarbons
Perform according to the provisions of GB/T 23992-2009. The calculation of
halogenated hydrocarbon content is carried out according to 8.5.2 of GB/T 23992-2009.
6.2.12 Total sum content of phthalic acid ester
Perform according to the provisions of GB/T 30646-2014.
6.2.13 Total content of alkylphenol ethoxylates
Perform according to the provisions of GB/T 31414-2015.
7 Inspection Rules
7.1 Type inspection
Appendix A
(Normative)
Determination of Moisture Content – Gas Chromatography
A.1 Reagents and materials
A.1.1 Distilled water: meet the requirements of Grade-3 water in GB/T 6682-2008.
A.1.2 Dilution solvent: The organic solvent used to dilute the specimen and dried by
molecular sieve does not contain any substances that interfere with the test. The purity
is at least 99% (mass fraction), or the purity is known. For example, dimethylformamide
and so on.
A.1.3 Internal standard substance: a compound that does not exist in the specimen
and is dried by molecular sieve; and the compound may be completely separated from
other components on the chromatogram. The purity is at least 99% (mass fraction), or
the purity is known. For example, isopropanol, etc.
A.1.4 Molecular sieve: the pore size is 0.2nm~0.3nm; and the particle size is
1.7mm~5.0mm. Molecular sieve shall be used after regeneration.
A.1.5 Carrier gas: hydrogen or helium, purity ≥99.995%.
A.2 Apparatus
A.2.1 Gas chromatograph: equipped with thermal conductivity detector and
temperature program controller.
A.2.2 Chromatographic column: capillary column of styrene-divinylbenzene porous
polymer.
NOTE: Other chromatographic columns that meet the inspection requirements may also be
used.
A.2.3 Sampler: Micro syringe, 10μL.
A.2.4 Sample bottle: about 10mL glass bottle with a sealable cap.
A.2.5 Balance: the actual division value d=0.1mg.
A.3 Gas chromatography test conditions
A.3.1 Chromatographic column: capillary column of styrene-divinylbenzene porous
polymer, 25m×0.53mm×10μm.
......
(Above excerpt was released on 2020-08-29, modified on 2021-06-07, translated/reviewed by: Wayne Zheng et al.)
Source: https://www.chinesestandard.net/PDF.aspx/GB18581-2020