Standard classification for use in testing heavy m

2022-07-23
  • Detail

Standard classification for "heavy metal" testing in coatings

standard classification for "heavy metal" testing in coatings

november30,2018

0 preface

coatings are widely used, but due to the complex composition of coatings, a variety of harmful substances may be introduced in the production process. These substances mainly include toluene, xylene, toluene diisocyanate, phthalate esters, ethylene glycol ethers and ether esters, as well as some toxic and harmful heavy metal elements such as lead (PB), mercury (Hg), cadmium (CD), arsenic (as) and chromium (CR). These elements will accumulate in the body and are not easy to be discharged from the body. Exceeding a certain amount will have toxic effects on humans and animals, causing tissue and organ diseases or functional disorders, Cause great irreversible damage to human health. In order to limit the content of these elements in coating products, the National Standardization Administration Committee has formulated many standards for Chinese coatings. These standards include national and industrial standards, product standards and method standards. The formulation of these standards has achieved positive significance in standardizing the quality of coating products and conducting coating testing. However, due to the large number and different categories of these standards, it is easy to cause confusion in the process of use. This paper lists and classifies the testing standards containing heavy metals in the current commonly used coating standards, and summarizes the content of the testing methods in the standards, so as to facilitate the use of engineers and technicians who test heavy metals in coatings

1 classify the standards according to the test principle

1.1 test principle of "soluble" heavy metal content

"soluble" heavy metal content test refers to the use of a solution with the same concentration as human gastric acid, which is generally prepared into a 0.07 mol/l dilute hydrochloric acid solution (pH =1.12) to treat the coating dry film (self drying or drying), and then use appropriate methods to determine the content of specified elements. Its essence is to separate elements through extraction, Dissolve the measured elements in acid solution

1.1.1 domestic standard for testing the content of "soluble" heavy metals in coatings

the earliest domestic standard for testing "soluble" heavy metals is gb9760-1988, which stipulates that 0.07 mol/l hydrochloric acid extraction liquid or powdered paint is used. The standard is formulated by adopting iso6713-1984, which requires the solvent to be added to the coating to centrifuge the pigments and fillers in the excellent paint. It is not exactly the same as the "soluble" heavy metal content test currently used, and is not applicable to the dry film. At present, the standards for testing the content of "low noise soluble" heavy metals in paint standards mainly include:

gb 18581-2009 indoor decoration materials limit of harmful substances in solvent based wood coatings

gb 18582-2008 indoor decoration materials limit of harmful substances in interior wall coatings

gb 18581-2001 indoor decoration materials limit of harmful substances in solvent based wood coatings

gb 18582-2001 indoor decoration materials limit of harmful substances in interior wall coatings

gb 18584-2001 indoor decoration materials limit of harmful substances in wood furniture

gb 24613-2009 limit of harmful substances in coatings for toys

gb 8771-2007 maximum limit of soluble elements in pencil coating

gb 6675-2003 National Technical Specification for toy safety

gb/t 23446-2009 spray polyurea waterproof coating

gb/t 23996-2009 solvent based metal plate coatings for interior decoration

gb/t 23994-2009 limits of specific harmful elements in coatings for consumer products in contact with human body

gb/t 23991-2009 determination of "soluble" harmful elements in coatings. Hj/t 371-2007 technical requirements for environmental labeling products gravure ink and flexographic ink

hj4 57-2009 technical requirements for environmental labeling products waterproof coating

hj/t 201-2005 environmental labeling product technical requirements water based coating

hj/t 414-2007 technical requirements for environmental labeling products solvent based wood coatings for interior decoration

hg/t 3951-2007 water based color paste for architectural coatings

hg/t 2238-1991 f phenolic varnish

jc 1066-2008 limit of harmful substances in building waterproof coatings

jg/t 206-2007 environmentally friendly silicone acrylic lotion coating for external wall thermal insulation

hg/t 3828-2006 indoor water-based wood coatings

hg/t 2006-2006 thermosetting powder coating

jg/t 210-2007 primer for interior and exterior walls of buildings

qb/t 2359-2008 technical conditions for toy surface coating

gb/t 9758.1-1988 determination of "soluble" metal content:

Part 1: Determination of lead content Flame atomic absorption spectrometry and dithizone spectrophotometry

gb/t 9758.4-1988 "determination of soluble" metal content: Part 4: Determination of cadmium content Flame atomic absorption spectrometry and polarography

gb/t 9758.6-1988 "determination of soluble" metal content: Part 6: Determination of total chromium content in the liquid part of paints flame atomic absorption spectrometry

gb/t 9758.5-1988 "determination of soluble" metal content: Part 5: Determination of hexavalent chromium content in pigment part of liquid paints or powder paints diphenylcarbazide spectrophotometric method

gb/t 9758.7-1988 "determination of soluble" metal content: Part 7: Determination of mercury content in the pigment part of paints and the liquid part of water diluble paints flameless atomic absorption spectrometry

gb/t 9758.2-1988 "determination of soluble" metal content: Part 2: Determination of antimony content Flame atomic absorption spectrometry and Rhodamine B spectrophotometry

gb/t 9758.3-1988 "determination of soluble" metal content: Part 3: Determination of barium content Flame atomic emission method

among the methods and standards for testing "soluble" heavy metals, the mandatory standards GB 18581 and GB 18582 aluminum alloy door and window handles qb/t 3889 ⑴ 999 require the extraction of elements at room temperature, which is different from the extraction temperature of (37 ± 2) ℃ specified in GB 24410. At the same time, compared with GB 18581-2001, GB 18582-2001, GB 18581-2009 and GB18582-2008, coefficient correction is added to the test results, which changes from using AAS to using appropriate instruments, including ICP-OES

1.1.2 relevant international test standards for "soluble" heavy metal elements in coatings

iso:2010 Toy Safety - Part 3: transfer of some elements, and the transportable amount of 8 elements

astm f963-2011 toy safety standard, measuring the transportable amount of 8 elements

c.r.c., c.931 Canadian hazardous products (toys) Regulations: involving the transportable amount of lead, mercury, antimony, arsenic, barium, cadmium and selenium. It is required that Mercury cannot be detected in the sample, and the content of "soluble" antimony, arsenic, barium, cadmium and selenium shall be less than or equal to 0.1%. The value of total lead shall not be greater than 600 without measuring "soluble" lead ×。

Canada's "product safety laboratory" book5- experimental rules and procedures () test five "soluble" heavy metals

en:2001/ac:2002 Toy Safety - Part 3: transfer of certain elements, which specifies the maximum limit values of 8 transportable elements (antimony, arsenic, barium, cadmium, chromium, lead, mercury and selenium) in accessible parts or materials of toys

bs 5665:part 3/bs en transfer of some elements (UK), DIN EN transfer of some elements (Germany), NF en transfer of some elements (France). The contents of EU toy standard EN71 are applied to the technical contents of British, German and French toy standards

as/nzs iso:2003 migration of some elements. As/nzs ISO 8124 is a general toy standard in Australia and New Zealand, and its technical content is basically equivalent to the international toy standard ISO 8124

st 2002, the standard of Japan Toy Association, specifies the limit values of 8 heavy metals in the surface coating of toy materials

1935/2004/ec, directive on substances in contact with food (EU), testing the transportable amount of lead, cadmium and chromium in the outer coating and coating of food packaging

the international standard for testing the content of "soluble" heavy metals in coatings is mainly to test the content of heavy metals on the coatings of some products in close contact with people, including toy coatings, coatings on food packaging, etc. The method specified in en standard has been adopted or used by ISO and many countries, and its content is constantly being revised and updated. In en (1988), AAS (atomic absorption spectrometer) is required to be used for determination. In en (19942000), no type of instrument is specified, and only the detection limit of the instrument can reach 1/10 of the limit value. En (19942000) also stipulates that the test results of 8 elements shall be corrected by multiplying the correction coefficient. In the latest version of en, 19 elements have been detected, including aluminum, antimony, arsenic, barium, boron, cadmium, chromium (III), chromium (VI), cobalt, copper, lead, manganese, mercury, nickel, selenium, strontium, tin, organic tin and zinc. This standard will take effect on July 21, 2013

1.2 principle of total heavy metal content test

total heavy metal content test refers to the use of appropriate pretreatment methods to convert all the tested elements into a state suitable for determination for the dried film, and then the use of appropriate analytical instruments to determine the content of heavy metal elements in the treated test solution

1.2.1 national standard for testing the content of total heavy metals in coatings

gb 24409-2009 limit of harmful substances in automotive coatings

gb 24408-2009 limit of harmful substances in building exterior wall coatings

gb 24613-2009 limit of harmful substances in coatings for toys

gb/t 6822-2007 antifouling and antirust paint system for ship hull (organic tin antifouling agent content)

hg/t 2445-91 various colors of nitro pencil paint

hg/t 2446-91 multicolor nitro pencil primer

hg/t 3952-2007 cathodic electrophoretic coating

hj/t 303-2006 technical requirements for environmental labeling products furniture

gb/t 13452.1-1992 testing of total lead content in paints and varnishes

gb/t 22788-2008 determination of total lead content in toy surface coatings

sn/t 2792-2011 determination of migration amount of specific elements and total lead content in coatings of imported and exported furniture

1.2.2 the international standard for testing the total heavy metal content in coatings

astm f963-2011 specifies the testing of total lead, and the total lead content in the coating is less than 90% ×。

US federal regulations and specifications (16CFR 1303) stipulate that the total lead limit of paint coatings in consumer goods such as furniture and toys shall not be greater than 600 ×, Later, according to CPSIA directive, the limit value was changed to 90 ×。

astm e (2007) Standard Practice for preparation of dry paint samples for continuous analysis of lead content by hot plate method or microwave dissolution method

cpsc-ch-e.1 (2011) standard operating procedure for determination of lead in coatings and other similar surface coatings

iec62321:2008 (ED 1.0) provides a standard method for the testing of lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyls and polybrominated diphenyl ethers in excess oil spills from gaps of electronic and electrical products

2000/53/ec technical directive on end-of-life vehicles, promulgated by the European Parliament and the Council on September 18, 2000, stipulates that the use of materials containing heavy metals such as lead, mercury, cadmium and hexavalent chromium is prohibited

2 classify the standards according to their contents

2.1 paint product standard for heavy metal testing

paint for toys: GB 24613-2009 limit of harmful substances in paint for toys; Qb/t 2359-2008 technical conditions for toy surface coating; Gb/t 23991-2009 determination of "soluble" harmful elements in paints; Gb/t 23994-2009 connection with human body

Copyright © 2011 JIN SHI