Foreword
Chapter 3 of this standard is mandatory, and the rest are recommended.
The limit value of benzene in this standard refers to the ecological standard product of the European Community-the eco-standard for paints and varnishes (1999/10 / EC), and the limit value of soluble heavy metals refers to the British, German, French and European Economic Commission ’s Requirements for toxic metals (BS5665: 1989, DINEN71: 1989, NFEN71-3, EN71: 1988).
Since January 1, 2002, the products produced by the manufacturing enterprises shall implement the national standard, with a transition period of 6 months; from July 1, 2002, the market will stop selling products that do not meet the national standard.
This standard was proposed by China Petroleum and Chemical Industry Association.
This standard is under the jurisdiction of the National Coatings and Pigments Standardization Technical Committee.
This standard is drafted by the unit; Changzhou Coating Chemical Research Institute of China National Chemical Construction Corporation, Environmental Hygiene Monitoring Institute of Chinese Academy of Preventive Medicine, Shanghai Coating Co., Ltd., Shanghai Coating Research Institute, Sinochem Chemical Standardization Institute, China Academy of Building Research.
Participants of this standard: China Coatings Industry Association, China Building Materials Research Institute, Shanghai Huasheng Chemical Co., Ltd., Nanjing Huacai Special Coatings Factory, Nippon Paint (China) Co., Ltd., Buneimen Swire Paint (China) Co., Ltd. , Zhejiang Tiannv Group Paint Co., Ltd., Shanghai Paint Factory, Changzhou Monkey King Paint Co., Ltd., Shanghai Academy of Building Research.
The main drafters of this standard: Zhang Junzhi, Zhao Ling, Feng Shifang, Qi Qiping, Wu Guolin, Xu Dongqun, Wang Daozhang, Mei Jian, Xiong Wei.
This standard was first published on December 10, 2001.
This standard is entrusted to the National Coatings and Pigments Standardization Technical Committee for interpretation.
1. Detection range of gas chromatograph
This standard specifies the technical requirements, test methods, inspection rules, packaging marks, safety coating and protection of nitro lacquers, polyurethane lacquers and alkyd lacquer wood coatings for interior decoration and decoration to human bodies content.
This standard is applicable to solvent-based wood coatings for interior decoration. For other resin types and other types of solvent-based coatings for interior decoration and decoration, refer to the use.
This standard does not apply to water-based wood coatings.
2. Normative references for the determination of harmful substances in solvent-based wood coatings for interior decoration materials by gas chromatography
The clauses in the following documents become the clauses of this standard through quotation from this standard. For dated reference documents, all subsequent amendments (not including errata content) or revisions do not apply to this standard, however, encourage parties to reach an agreement based on this standard to study whether the latest versions of these documents can be used . For the cited documents without date, the latest version is applicable to this standard.
GB / T1250-1989 limit value expression method and judgment method.
GB3186-1982 (1989) Sampling of paint products (neqISO1512: 1974)
GB / T6682-1992 Analysis laboratory water specification and test method (neqISO3696: 1987)
GB / T6750-1986 Determination of density of paints and varnishes (neqISO2811: 1974)
GB / T6751-1986 Determination of volatile and non-volatile matter of paints and varnishes (neqISO1515: 1973)
GB / T9750-1998 coating product packaging mark
GB / T9758.1-1988 Determination of "soluble" metal content of paints and varnishes. Part 1: Determination of lead content. Flame atomic absorption spectrometry and dithizone spectrophotometry (idtISO3856.1: 1984)
GB / T9758.4-1988 Determination of "soluble" metal content of paints and varnishes. Part 4: Determination of cadmium content. Flame atomic absorption spectrometry and polarography (idtISO3856.4: 1984)
GB / T9758.6-1988 Determination of "soluble" metal content in paints and varnishes. Part 6: Determination of total chromium content in the liquid part of paints. Flame atomic absorption spectrometry (idtISO3856.6: 1984)
GB / T9758.7-1988 Determination of "soluble" metal content of paints and varnishes. Part 7: Determination of mercury content in the pigment part of the paint and the liquid part of the water-reducible paint. Flameless atomic absorption spectrometry : 1984)
GB / T18446-2001 Determination of unreacted toluene diisocyanate (TDI) monomer in urethane prepolymer and coating solution by gas chromatography
3. Determination of harmful substances in solvent-based wood coatings for interior decoration materials by gas chromatography
The product should meet the technical requirements of Table 1
Table 1 Technical requirements
Project limit value
Nitro paint, polyurethane paint, alkyd paint
Volatile organic compound (VOC) (g / L) ≤750 gloss (60`) ≥80, 600 gloss (60`) <80, 700550
Benzene% ≤0.5
Sum of toluene and xylene% ≤454010
Free toluene diisocyanate (TDI)% ≤-0.7-
Heavy metal (limited paint) (mg / kg) ≤ soluble lead 90
Soluble cadmium 75
Soluble chromium 60
Soluble mercury 60
a Determined after mixing according to the specified ratio and dilution ratio of the product. If the amount of diluent used is within a certain range, it should be measured after dilution according to the recommended maximum dilution.
b If the product specifies the dilution ratio or the product is composed of two or more components, the content of the diluent and each component should be determined separately, and then the total amount of the mixed paint should be calculated according to the specified ratio of the product. If the amount of diluent used is within a certain range, it should be calculated according to the recommended maximum dilution.
c. If the polyurethane paint stipulates the dilution ratio or consists of two or more components, the content of the curing agent (toluene diisocyanate prepolymer) should be measured first, and then the mixed paint should be calculated according to the ratio The content. If the amount of diluent used is within a certain range, it should be calculated according to the recommended minimum dilution.
4. Brief introduction of the experimental method for the determination of harmful substances in solvent-based wood coatings for interior decoration materials by gas chromatography
4.1 Sampling
Products are sampled according to the regulations of GB3186-1982 (1989). The sample is divided into two parts, one is sealed and the other is used as the inspection sample.
4.2 Determination of volatile organic compounds (VOC)
4.2.1 After stirring the sample evenly, determine the mass fraction (V) of the volatile matter in the coating according to GB / T6751-1986. The test condition: (105 ± 2) `C, keep it for 3h.
4.2.2 After stirring the sample evenly, determine the coating density (Ï) according to GB / T6750-1986, and the test temperature is (23 ± 2) `C.
4.2.3 The content of volatile organic compounds is calculated as follows:
VOC = V * Ï * 10 * 10 * 10 .................. (1)
In the formula:
VOC-the content of volatile organic compounds in the paint, the unit is grams per liter (g / L);
V--mass fraction of volatiles in paint;
Ï--Density of the paint at (23 ± 2) `C in grams per milliliter (g / mL).
4.3 The determination of benzene is carried out according to Appendix A.
4.4 The measurement of toluene and xylene shall be carried out according to Appendix A.
4.5 The determination of free toluene diisocyanate (TDI) shall be carried out according to GB / T18446-2001. The fixing liquid can also be selected from methyl polysiloxane (SE-30). For samples that easily decompose at 150 ° C. A suitable temperature can be selected so that the sample can be completely vaporized without decomposition.
4.6 Determination of heavy metals (soluble lead, soluble cadmium, soluble chromium, soluble mercury) according to Appendix B.
5. Inspection rules
5.1 All technical contents listed in this standard are type inspection items.
5.1.1 Under normal production conditions, type inspection shall be carried out at least once a year.
5.1.2 Type inspection should be carried out at any time when one of the following conditions exists:
--When the new product is initially finalized;
--When the product is produced off-site;
-When there are major changes in production formulas, processes and raw materials;
--When production is resumed after three months of suspension.
5.2 Determination of inspection structure
5.2.1 Judgment of inspection results shall be carried out according to the rounding value comparison method in GB / T1250-1989.
5.2.2 When the inspection results of all items meet the requirements of this standard, the product conforms to the requirements of this standard. If there is an inspection result that does not meet the requirements of this standard, the stored sample should be re-inspected. If the re-inspection result still does not meet the requirements of the standard, the product does not meet the requirements of this standard.
6. Packaging mark
6.1 In addition to complying with the provisions of GB / T9750-1998, the product packaging mark shall be clearly indicated on the packaging mark for products that have passed the inspection according to this standard.
6.2 For coatings composed of two or more components, the distribution ratio of each group should be clearly stated on the packaging mark. For paints that need to be diluted during construction, the dilution ratio should be clearly stated on the packaging mark.
7. Safe painting and protection
7.1 When painting, ensure that the room is well ventilated and away from fire.
7.2 The painting method should be brush painting as much as possible.
7.3 Construction personnel should wear the necessary protective equipment during painting.
7.4 After finishing painting, continue to maintain indoor air circulation.
7.5 The room after painting should be left empty for a period of time before use.
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