GB/T 1741-2020_English: PDF (GB/T1741-2020)
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| Standard ID | GB/T 1741-2020 (GB/T1741-2020) | | Description (Translated English) | Test method for determining the resistance of paints film to mold | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | G50 | | Classification of International Standard | 87.040 | | Word Count Estimation | 8,811 | | Date of Issue | 2020-11-19 | | Date of Implementation | 2021-10-01 | | Older Standard (superseded by this standard) | GB/T 1741-2007 | | Drafting Organization | Guangdong Institute of Microbiology (Guangdong Microbiological Analysis and Testing Center), DuPont China Group Co., Ltd. Shanghai Branch, Nippon Paint (China) Co., Ltd., Zhejiang Yutong New Material Co., Ltd., AVIC Biom New Material Technology Engineering Co., Ltd. Company, Shanghai Jianke Inspection Co., Ltd., Lonza (China) Investment Co., Ltd., Thor Specialty Chemicals (Zhenjiang) Co., Ltd., Shenzhen Guangtian High-tech New Material Co., Ltd., Zhejiang Boxing Chemical Coating Co., Ltd., CNOOC Changzhou Coating Chemical Research Institute Co., Ltd., Guangdong Dimei Biotechnology Co., Ltd., Ningbo Xin'an Coating Co., Ltd., Qingdao Jufang Environmental Technology Co., Ltd., Xiamen Baianxing New Material Co., Ltd., Yashili Coating (Suzhou) Co., Ltd., Dongguan Dabao Chemical Products Co., Ltd. , Qingdao Aierjiajia New Material | | Administrative Organization | National Coatings and Pigments Standardization Technical Committee (SAC/TC 5) | | Regulation (derived from) | National Standard Announcement No. 26 of 2020 | | Proposing organization | China Petroleum and Chemical Industry Federation | | Issuing agency(ies) | State Administration for Market Regulation, National Standardization Administration | | Standard ID | GB/T 1741-2007 (GB/T1741-2007) | | Description (Translated English) | Test methods for determining the resistance of paints film to mold | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | G50 | | Classification of International Standard | 87.040 | | Word Count Estimation | 9,987 | | Date of Issue | 2007-09-11 | | Date of Implementation | 2008-04-01 | | Older Standard (superseded by this standard) | GB/T 1741-1979 (1989) | | Drafting Organization | Guangdong Institute of Microbiology | | Administrative Organization | National Standardization Technical Committee of paints and pigments | | Regulation (derived from) | China Announcement of Newly Approved National Standards No. 10 of 2007 (No. 110 overall) | | Proposing organization | China Petroleum and Chemical Industry Association | | Issuing agency(ies) | Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China; Standardization Administration of China | | Summary | This standard specifies the architectural coatings, the wall mold-resistant paint film performance test methods and evaluation of results. Other properties determination mildew resistant paint film may also refer to this standard. This test should be a certain microbes knowledge personnel. This standard applies to interior and exterior paint Determination of resistance to fungal properties, other types of film fungal resistance may refer to the standard measurement. | | Standard ID | GB/T 1741-1979 (GB/T1741-1979) | | Description (Translated English) | Methods of test for mold resistance of paint films | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | G50 | | Date of Issue | 1979/9/15 | | Date of Implementation | 1980/1/1 |
GB/T 1741-2020
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 87.040
G 50
Replacing GB/T 1741-2007
Test method for determining the resistance of paints
film to mold
ISSUED ON: NOVEMBER 19, 2020
IMPLEMENTED ON: OCTOBER 01, 2021
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of
China.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 Terms and definitions ... 6
4 Test principle ... 6
5 Equipment and materials ... 6
6 Medium and reagents ... 7
7 Test procedures ... 9
8 Test report ... 12
Test method for determining the resistance of paints
film to mold
Warning – Personnel who uses this Standard shall have practical
experience in formal laboratory work. This Standard does not address all
possible safety issues. It is the user's responsibility to take appropriate
safety and health measures and ensure compliance with conditions which
are set by relevant national laws and regulations.
1 Scope
This Standard specifies the test principle, equipment and materials, culture
medium and reagents, test procedures and test report which are involved in the
test of the resistance of paints film to mold.
This Standard applies to the determination of the resistance of paints film of
architectural coating to mold. For the determination of the resistance of other
types of paints film to mold, this Standard can be referred to.
2 Normative references
The following documents are indispensable for the application of this document.
For dated references, only the dated version applies to this document. For
undated references, the latest edition (including all amendments) applies to this
document.
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 9271-2008, Paints and varnishes standard panels for testing
GB/T 9278, Temperatures and humidities for conditioning and testing of paint
specimens
GB/T 23987-2009, Paints and varnishes - Exposure of coatings to artificial
weathering - Exposure to fluorescent UV lamps and water
YY 0569-2011, Class II biological safety cabinets
5.6 pH meter: The division value is 0.01.
5.7 Centrifuge: The speed is 500 r/min ~ 5 000 r/min.
5.8 Biological safety cabinet: in accordance with the requirements of class II
biological safety cabinet that is specified by YY 0569-2011.
5.9 Microscope: ordinary optical microscope.
5.10 Refrigerator: The temperature control range is 4 °C ~ 10 °C; the
temperature uniformity does not exceed ±2 °C; the temperature fluctuation does
not exceed ±2 °C.
5.11 Nebulizer: The capacity is 30 mL.
5.12 Graduated cylinder: The capacities are 10 mL, 50 mL, 100 mL, 500 mL
and 1 000 mL.
5.13 Petri dish: The diameter is ϕ90 mm.
5.14 Blood counting chamber.
5.15 Triangular flask: The capacities are 125 mL, 500 mL.
5.16 Inoculation loop.
5.17 Glass bead: The diameter is 3 mm ~ 7 mm.
5.18 Glass funnel.
5.19 Fiber filter paper: qualitative fiber filter paper.
5.20 Beaker: The capacities are 500 mL and 1 000 mL.
5.21 Colorless glass test tube: The specification is 10 mm × 180 mm.
6 Medium and reagents
6.1 General requirements
Unless otherwise specified, all tests use chemically pure or reagents above
chemically pure and distilled water or deionized water that meets the
requirements of Grade-3 water in GB/T 6682-2008.
6.2 Sterile water
Accurately weigh 0.005 g of dispersant (such as Tween 80) and add it to 100
mL of water; stir evenly; divide it into colorless glass test tubes (5.21) at a
cultivate at 28 °C ~ 30 °C for 7 d ~ 14 d; when the surface of the medium is
covered with mold spores, add 10 mL of sterile water (6.2); in the biological
safety cabinet (5.8), use a sterile inoculation loop (5.16) to gently scrape mold
spores on the surface of the mold culture, under aseptic operating conditions,
to make into a mold spore suspension.
Pour the mold spore suspension into a 125 mL sterile triangular flask (5.15) with
a stopper, which has been pre-filled with 45 mL of sterile water (6.2) and 10 ~
15 sterile glass beads (5.17); vigorously shake the sterile triangle flask (5.15)
to break up the spore clusters and release mold spores from the fruit body.
Place a sterile glass funnel (5.18) with sterile fiber filter paper (5.19) on a sterile
triangular flask (5.15); pour the shaken mold spore suspension into a sterile
glass funnel (5.18) to filter and remove mycelium and medium fragments.
Centrifuge the filtered mold spore suspension at a speed of 4 000 r/min under
aseptic conditions; remove the supernatant; add 10 mL ~ 50 mL of sterile water
(6.2) to the spore precipitate; mix well; then, centrifuge to get the mold spore
precipitate; re-add sterile water to mix; centrifuge again to obtain mold spore
precipitate.
Use the nutrient solution (6.3) to dilute the mold spore precipitate; use a blood
counting chamber (5.14) or other methods to determine the concentration of
mold spores; dilute so that the concentration of mold spores in the suspension
is 0.8×106/mL ~ 1.2×106 /mL.
Each kind of prepared mold spore suspension can be stored in a refrigerator
(5.10) at 4 °C ~ 10 °C for no more than 4 days. Before the test, mix each
prepared mold spore suspension in equal volume to obtain a mixed mold spore
solution.
7.2 Sample
Take samples of the product according to GB/T 3186; the sampling amount
shall be determined according to the inspection requirements.
7.3 Preparation of samples
7.3.1 Test sample
Unless otherwise specified, use aluminum plates, glass plates and other
substrates that are not easy to rust and absorb moisture; the size is 50 mm ×
50 mm; the thickness is at least 1 mm.
Unless otherwise specified, process each test plate according to the provisions
of GB/T 9271-2008; aluminum plate and other metal substrates can be polished
with suitable sandpaper. Then, apply and maintain 3 test plates as test samples
according to the product regulations. The paints film of the outdoor product test
sample is subjected to an aging test according to the provisions of 8.2.1 in GB/T
23987-2009 before the resistance test to mold; the irradiance is 0.83 W·m-2·nm-
1; the test time is 100 h. Unless otherwise agreed, the test sample shall be
adjusted for at least 4 h under the conditions that are specified in GB/T 9278
before the test.
7.3.2 Control sample
3 sheets of sterile fiber filter paper (5.19) whose size is (50×50) mm.
7.4 Inoculated culture
7.4.1 Petri dish method
Pour about 20 mL of nutrient agar medium (6.4) into a sterile petri dish (5.13).
When the medium is solidified, under aseptic conditions, place 3 test samples
and 3 control samples respectively in the center of the surface of the petri dish
that contains the culture medium.
Use a sterile sprayer (5.11) to evenly spray 0.4 mL ~ 0.6 mL of mixed mold
spore solution (7.1.3) on the surface of each test sample and control sample
and the surface of the culture medium, so that the entire test sample and the
surface of the control sample and the surface of the culture medium are wet.
Place the inoculated test sample and control sample in a constant temperature
and humidity incubator (5.1); incubate for 7 days at a temperature of 25 °C ~
30 °C and a relative humidity of not less than 85%; then, visually inspect the
growth of mold on the control sample; the three control samples shall have mold
growth; otherwise, the test is invalid and the test shall be repeated. If mold
growth can be seen on each control sample, continue to incubate the test
sample and the control sample for 28 days and evaluate the result according to
7.5. The cultivation time can be extended to 56 days upon agreement by the
relevant parties.
7.4.2 Suspension method
This method applies to large test samples, irregular test samples and test
samples that cannot be tested by the petri dish method.
Inoculate the prepared mixed mold spore solution (7.1.3) on the surfaces of 3
test samples and 3 control samples respectively.
Dry the inoculated test samples and control samples at room temperature for
10 minutes ~ 30 minutes; hang them in a glass or plastic container, with a tight
lid, that can hold the test sample. The size and shape of the container shall be
such that there is enough exposed water surface area at the bottom of its
internal space, to ensure that the samples placed have enough space, not to
......
GB/T 1741-2007
Test methods for determining the resistance of paints film to mold
ICS 87.040
G50
National Standards of People's Republic of China
Replacing GB/T 1741-1979 (1989)
Film fungal resistance assays
Posted 2007-09-11
2008-04-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Foreword
This standard replaces GB/T 1741-1979 (1989) "Determination of mildew-resistant paint."
This standard compared with GB/T 1741-1979 (1989), the main technical differences are.
--- More rigorous form. This standard is divided into scope, normative references, terms and definitions, test principle, test conditions, mold
Preparation of bacteria and mold spores mixed suspension (seed), testing procedures, the results observed in all 8 chapters.
--- Revised Test Method and time. Depending on the version before the test sample selection methods, namely Method A and Method B, these two methods real
For the same test methods, namely dish law on the occasion, the test time is 14d. Standard Test Method for this assay into a petri dish
Wet room and hanging two kinds of methods, test time is 28d.
--- For equipment demanding. This standard adds constant temperature and humidity incubator, hygrometer, mold spores was spray tank, biosafety
Cabinets, refrigerators and other test equipment.
--- Preparation of the film made requirements.
--- Test species selection more scientific, more in line with the actual use of the environment.
--- Increasing the positive control and a negative control test in order to determine the reliability of the test.
--- Spore suspension spore concentration provided for.
--- Increased durability mildew test content.
--- Revised rating methodology.
The standard proposed by China Petroleum and Chemical Industry Association.
This standard by the National Standardization Technical Committee paint pigment.
This standard was drafted. Guangdong Institute of Microbiology (Guangdong Province, microbiological analysis Testing Center), China National Chemical Construction Corporation, Changzhou coating
Material Chemical Research Institute (National Paint Quality Supervision and Inspection Center).
The main drafters of this standard. PENG, Zhao Ling, Chen Yi this, Ouyang sheng, Xie Bao.
Film fungal resistance assays
1 Scope
This standard specifies the building coatings, wall paint resistant to mold performance test methods and evaluation of results.
Determination of other mold-resistant properties of the film can also be performed with reference to this standard.
This test should be operated by a person with knowledge of certain microorganisms.
This standard applies to the determination of interior and exterior paint resistant to mold performance of other types of fungal-resistant film can be determined with reference to this standard.
2 Normative references
The following documents contain provisions which, through reference in this standard and become the standard terms. For dated references, subsequent
Amendments (not including errata content) or revisions do not apply to this standard, however, encourage the parties to the agreement are based on research
Whether the latest versions of these documents. For undated reference documents, the latest versions apply to this standard.
GB/T 1727-1992 Film General Preparation Method
GB/T 3186 Paints, varnishes and raw materials for paints and varnishes - Sampling (GB/T 3186-2006, ISO 15528.2000, IDT)
3 Terms and Definitions
3.1
It means capable of growing in the architectural coating a kind of filamentous fungi. Such fungi can produce organic acids by an enzyme or other secretions to send film
Health erosion and destruction, to change its physical and chemical properties and reduce the life of the film.
3.2
Resistant to mildew, also called mildew, mildew and other means building coating has tolerated or prevent, inhibit the growth and reproduction of mold spores and mycelia
ability.
4 Test principle
Simulation of natural environmental conditions for mold growth, mold growth according to the physiological characteristics of the design of the test for measuring the film in this
Fungal species under conditions of tolerance effect, and with the naked eye (by means of a magnifying glass if necessary) way to test the extent of mildew was observed, in order to evaluate the film
Antifungal properties. Exterior wall paint in the polymer by action of sunlight and oxygen, as well as atmospheric wind, frost, rain, dew, high temperature, cold
And other physical and mechanical changes, resulting in polymer molecular chains, degradation, irreversible changes in the structure of the coating damage, mildew can
Power drops. Therefore, the external walls of the film is also subject to anti-aging test and then tested for anti-fungal properties test.
5 Test conditions
5.1 The main equipment and materials
Centrifuges, mold spores was spray tank, biological safety cabinet (also allows clean bench), refrigerator.
5.1.2 colorless glass tubes, 90mm colorless glass Petri dish, 400mm colorless glass Petri dish, flask (capacity 50mL,
100mL, 250mL and 500mL), colorless glass funnel, alcohol lamp, sprayer, aluminum (or glass, wood, tin sheets, etc.), glass or
Plastic sealed container, ring vaccination.
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