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All technical contents of this standard are compulsory.
This standard is developed in accordance with the rules given in GB/T 1.1-2009.
This standard replaces GB 18581-2009 Indoor decorating and refurbishing materials - Limit of harmful substances of solvent based coatings for woodenware and GB 24410-2009 Indoor decorating and refurbishing materials - Limit of harmful substances of solvent based coatings for woodenware. This standard is developed by reference to GB 18581-2009, and integrates the contents given in GB/T 24410-2009. In addition to editorial changes, the following main technical changes have been made with respect to GB/T 18581-2009:
——“Scope” is modified (see Clause 1 hereof; Clause 1 of GB 18581-2009);
——in “Normative references”, “GB/T 1250 and GB 18582-2008” are deleted; “GB/T 6682-2008, GB/T 8170-2008, GB/T 23985-2009, GB/T 23986-2009, GB/T 23990-2009, GB/T 23991-2009, GB/T 23992-2009, GB/T 23993-2009, GB/T 30646-2014, GB/T 30647-2014, GB/T 31414-2015, GB/T 34675-2017, GB/T 34682-2017 and GB/T 36488-2018” are added (see Clause 2 hereof; Clause 2 of GB 18581-2009);
——definitions of “volatile organic compound” and “volatile organic compound content” are modified; terms and definitions of “unsaturated polyester coatings” and “application condition” are added (see Clause 3 hereof; Clause 3 of GB 18581-2009);
——"Product classification” is added (see Clause 4 hereof);
——"nitrocellulose" in solvent-based woodenware coatings is changed to "nitrocellulose (limited to industrial coating)”; “unsaturated polyester" in solvent-based woodenware coatings and its items and indexes are added; “water-based coating”, “ radiation curable coating” and “powder coating” and their items and indexes are added; "formaldehyde content”, “total lead (Pb) content”, “total content of ethylene glycol ether and ether ester”, “total content of benzene series”, “total content of polycyclic aromatic hydrocarbons”, “total content of phthalic acid esters” and “total content of alkylphenol ethoxylates” and their items and indexes are added (see Table 1 herein; Table 1 in GB 18581-2009);
——“total content of methylbenzene, dimethylbenzene and ethylbenzene” is changed to “total content of methylbenzene and dimethylbenzene (including ethylbenzene)"; “halohydrocarbon content” is changed to “total content of halohydrocarbon”; “lead (Pb)” item in soluble heavy metal and its index are deleted; indexes of “VOC content”, “benzene content”, “polyurethane” and “nitrocelulose”, “total content of benzene and dimethylbenzene (including ethylbenzene)", and "total content of free toluene diisocyanate" items are modified; the controlled varieties of the halohydrocarbon are modified (see Table 1 herein; Table 1 in GB 18581-2009);
——test methods for items “VOC content”, “soluble heavy metal content”, “benzene content”, “total content of benzene and dimethylbenzene (including ethylbenzene)”, “methanol content”, “total content of halohydrocarbon” are modified (see Sub-clause 6.2 hereof; Sub-clause 5.2 of GB 18581-2009);
——test methods for “formaldehyde content”, “total lead (Pb) content”, “total content of ethylene glycol ether and ether ester”, “total content of benzene series”, “total content of polycyclic aromatic hydrocarbons”, “total content of phthalic acid esters”, “total content of alkylphenol ethoxylates” are added (See Sub-clause 6.2);
——contents with regard to the judgment of the inspection results are modified (see Sub-clause 7.2 hereof; Sub-clause 6.2 of GB 18581-2009);
——contents with regard to the marks for package are modified (see Clause 8 hereof; Clause 7 of GB 18581-2009);
——painting safety and protection are deleted (see Clause 8 of GB 18581-2009);
——Implementation of this standard is added (see Clause 9).
This standard was proposed by and is under the jurisdiction of the Ministry of Industry and Information Technology of the People's Republic of China.
The previous editions of this standard are as follows:
——GB 18581-2001 and GB 18581-2009;
——GB 24410-2009.
Limit of harmful substances of woodenware coatings
1 Scope
This standard specifies the product classification, requirements, test methods, inspection rules, marks for package and implementation of this standard involved in the allowable limit of harmful substances of woodenware coatings to human body and environment.
This standard is applicable to various woodenware coatings (including putty, primer and topcoat) for on-site coating and industrial coating except special functional coatings such as colored paints, bridging paints, wood stains, and open paints.
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 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 - Pyknometer 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 products
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 diisocyanates 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 chlorhydrocarbon content in coatings - Gas chromatographic method
GB/T 23993-2009 Determination of formaldehyde content of waterborne coatings - Spectrophtometric 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 polyethoxylates
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 kind of coating with the polyurethane (allophanate) resin, which is formed by the reaction between the polyisocyanate and the compound containing active hydrogen, as main film-forming material
3.2
nitrocellulose coatings
a kind of coating with the nitroncellulose, which is prepared by the reaction between the nitric acid and sulfuric acid mixture and the cellulose ester, as main film-forming material
3.3
alkyd coatings
a kind of coating with the alkyd resin, which is prepared by the polycondensation of the polybasic acid, fatty acid (or vegetable oil) and the polyhydric alcohol, as main film-forming material
3.4
unsaturated polyester coatings
a kind of coating with the unsaturated polyester resin, containing carbon-carbon double bonds on the polymer chain that are easy to cross-link with reactive diluent, as main film-forming material
3.5
volatile organic compound
VOC
an organic compound that participates in atmospheric photochemical reactions, or determined in accordance with relevant provisions
3.6
volatile organic compound content
VOC content
the mass of volatile organic compounds contained in coatings measured under specified conditions
[See Definition 2.271 in GB/T 5206-2015]
3.7
application condition
the condition that the application can be carried out after all components of the products are mixed when the application method and application criteria meet the requirements in the technical specifications of the corresponding products
4 Product classification
For the purposes of this standard, the woodenware coating is classified into solvent-based coating (including putty), water-based coating (including putty), radiation curable coating (including putty) and powder coating. Among them, the solvent-based coating (including putty) is classified into polyurethane, nitrocellulose (limited to industrial coating), alkyd and unsaturated polyester coatings; the water-based coating (including putty) is classified into colored paint and varnish; the radiation curable coating (including putty) is classified into water-based and non-water-based coatings.
5 Requirements
The limits of harmful substances in the woodenware coatings shall be in accordance with those specified in Table 1.
Table 1 Requirements for the limits of harmful substances
Item Limit
Solvent-based coating (including putty) a Water-based coating
(including putty) b Radiation curable coating
(including putty) Powder coating
Polyurethane Nitrocellulose (limited to industrial coating) Alkyd Unsaturated polyester Colored paint Varnish Water-based b Non-water-based a
VOC content Coating/(g/L) ≤ Topcoat [gloss (60°) ≥80 unit value]: 550 700 450 420 250 300 250 420 —
Topcoat [gloss (60°) <80 unit value]: 650
Primer: 600
Solvent-based putty/(g/L) ≤ 400 300 — —
Water-based and radiation curable putty/(g/kg) ≤ — 60 60
Formaldehyde content/(mg/kg) ≤ — 100 100 — —
Total lead (Pb) content /(mg/kg) ≤
(Limited to colored paint c, putty and alkyd varnish) 90
Soluble heavy metal/(mg/kg)
≤
(Limited to colored paint c, putty and alkyd varnish) Cadmium (Cd) content 75
Chromium (Cr) content 60
Mercury (Hg) content 60
Total content of ethylene glycol ether and ether ester/(mg/kg) ≤
(limited to ethylene glycol methyl ether, ethylene glycol methyl ether acetate, ethylene glycol aether, ethylene glycol ethyl ether acetate, ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether) 300 —
Benzene content/% ≤ 0.1 — — 0.1 —
Total content of methylbenzene and dimethylbenzene (including ethylbenzene) /% ≤ 20 20 5 10 — — 5 —
Total content of benzene series/(mg/kg) ≤
[Limited to benzene, methylbenzene and dimethylbenzene (including ethylbenzene)] — 250 250 — —
Total content of polycyclic aromatic hydrocarbons /(mg/kg) ≤
(Limited to naphthalene and anthracene) 200 — — 200 —
Total content of free toluene diisocyanate d/% ≤
[Limited to toluene diisocyanate (TDI) and hexamethylene diisocyanate (HDI)] Wet (moisture) cured coating
0.4 — — — —
Other: 0.2
Methanol content/% ≤ — 0.3 — — — — 0.3 —
Total content of halohydrocarbon/% ≤
(Limited to dichloromethane, chloroform, carbon tetrachloride, 1,1- dichloroethane, 1,2- dichloroethane, 1,1,1- trichloroethane, 1,1,2- trichloroethane, 1,2-dichloropropane, 1,2,3- trichloropropane, trichloroethylene, tetrachloroethylene) 0.1 — — 0.1 —
Total content of phthalic acid esters/% ≤
[Limited to dibutyl phthalate (DBP), butyl benzyl phthalate (BBP), di-2-ethylhexyl phthalate(DEHP), di-n-octyl phthalate (DNOP), di-iso-nonyl phthalate (DINP), di-iso-decylphthalate (DIDP)] — 0.2 — — — — —
Total content of alkylphenol ethoxylates/(mg/kg) ≤
{Limited to octylphenol polyoxyethylene ether [C8H17-C6H4-(OC2H4)nOH, OPnEO for short] and nonylphenol ethoxylates [C9H19-C6H4-(OC2H4)nOH, NPnEO for short], n=2~16} — 1 000 1 000 — —
a It is determined after mixing according to the application ratio under the application condition. Where consumption of a component among multiple components is within certain range, determination shall be carried out after mixing according to the specified maximum ratio of the application ratio of the product under application condition.
b Dilution ratio of water is not considered for all items of coating products. Dilution ratio of water is not considered for all items of paste putty and powder putty diluted with water only; as for powder putty (except for powder putty diluted with water only), the powder is directly tested for total lead and soluble heavy metal items, while it is tested after mixing the powder with other liquids such as water and adhesive according to the specified application ratio of the product under the application condition for other items. If the application ratio under application condition is within a certain range, it shall be tested after mixing according to the ratio of minimum consumption of water and maximum consumption of adhesives and other liquids.
c refers to a kind of coating containing pigment, extender and dye.
d If the dilution ratio is specified for the polyurethane coating and putty or the polyurethane coating and putty consist of two components or multiple components, the content in curing agent (containing free toluene diisocyanate prepolymer) shall be determined first, then the content in the mixed coating shall be calculated according to the specified application ratio of the product under the application condition. If the consumption of the diluent is within a certain range, it shall be calculated according to the specified minimum dilution ratio of the application ratio of the product under application condition; if the consumption of the curing agent is within a certain range, it shall be calculated according to the specified maximum ratio of the application ratio of the product under application condition.
6 Test methods
6.1 Sampling
Sampling is carried out in accordance with GB/T 3186 or by the agreed method. The sampling quantity shall be determined as required by inspection.
6.2 Test methods
6.2.1 VOC content
6.2.1.1 Density
It is tested in accordance with GB/T 6750-2007, at a temperature of (23±0.5)℃.
6.2.1.2 Gloss
It is tested in accordance with the requirements of GB/T 9754-2007. A template is prepared on a flat glass plate with a wet film preparation device with a groove depth of (100±2)μm. Black glass or flat glass precoated with matt black paint on the back shall be used as the substrate for the varnish. It is tested with a 60° specular gloss meter after drying the template for 48 h at a temperature of (23±2)℃ and a relative humidity of (50±5)%.
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Product classification
5 Requirements
6 Test methods
7 Inspection rules
8 Marks for package
9 Implementation of this standard
Bibliography
