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GB/T 13893.2-2019 English PDF (GBT13893.2-2019)

GB/T 13893.2-2019 English PDF (GBT13893.2-2019)

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GB/T 13893.2-2019: Paints and varnishes -- Determination of resistance to humidity -- Part 2: Condensation (in-cabinet exposure with heated water reservoir)

GB/T 13893.2-2019
Paints and varnishes--Determination of resistance to humidity --Part 2. Condensation (in-cabinet exposure with heated water reservoir) ICS 87.040
G50
National Standards of People's Republic of China
Paints and varnishes - Determination of moisture resistance - Part 2.
Condensation (exposure in a test chamber with a heated sink)
Part 2. Condensation (in-cabinetexposurewithheatedwaterreservoir)
(ISO 6270-2..2017, IDT)
Published on.2019-03-25
2020-02-01 implementation
State market supervision and administration
China National Standardization Administration issued
Foreword
GB/T 13893 "Determination of moisture resistance of paints and varnishes" is divided into the following sections. --- Part 1. Condensation (one-sided exposure);
--- Part 2. Condensation (exposure in a test chamber with a heated water tank); --- Part 3. Condensation (exposure in a test chamber with a heated, bubbling tank). This part is the second part of GB/T 13893.
This part is drafted in accordance with the rules given in GB/T 1.1-2009. This part uses the translation method equivalent to ISO 6270-2.2017 "Determination of moisture resistance of paints and varnishes - Part 2. Condensation (in Exposure inside the test chamber with a heated sink).
The documents of our country that have a consistent correspondence with the international documents referenced in this part are as follows. ---GB/T 9278-2008 Temperature and humidity of paint sample conditioning and testing (ISO 3270. 1984, IDT); ---GB/T 5206-2015 Terms and definitions for paints and varnishes (ISO 4618.2014, IDT). This part was proposed by the China Petroleum and Chemical Industry Federation. This part is under the jurisdiction of the National Coatings and Pigments Standardization Technical Committee (SAC/TC5). This section drafted by. Changzhou Guanghui Chemical Co., Ltd., Guangzhou Synthetic Materials Research Institute Co., Ltd., Shanghai Coatings Research Institute Limited Company, Zhejiang Yutong New Materials Co., Ltd., AVIC Baimu New Material Technology Engineering Co., Ltd., CNOOC Changzhou Coating Chemical Research Research Institute Co., Ltd., CZ Tangshan Locomotive and Rolling Stock Co., Ltd., Dongguan Enfeng Building Materials Technology Co., Ltd., Shenzhen Guangtian Environmental Protection Coating Co., Ltd. Company, Bingda Precision Instrument (Guangzhou) Co., Ltd., Hebei Chenyang Industry and Trade Group Co., Ltd., Zhonghua Paint (Shenzhen) Co., Ltd., USA Pannuo Experimental Equipment Co., Ltd. Shanghai Representative Office, Baden Fu Industrial Co., Ltd., Shunde District, Foshan City, Shanghai Pushen Chemical Machinery Co., Ltd., Zhejiang Mingquan Industrial Coating Co., Ltd., Zhejiang Fei Whale New Material Technology Co., Ltd., Zhuzhou Jiuhua New Material Coating Industry Co., Ltd., East Lai Coating Technology (Shanghai) Co., Ltd., Shaanxi Baotashan Paint Co., Ltd. The main drafters of this section. Cao Xiaodong, Wang Chongwu, Gao Jun, Zhao Shaohong, Li Xin, Wang Meimei, Shi Hua, Yang Yaliang, Wang Cheng, Wang Zhi, Long Fengjia, Gu Erning, Guo Xiaofeng, Lou Weilong, Zeng Qingle, Sun Dewang, Huang Lisha, Yan Chaoming, Gong Wenjing, Liu Lichun, Liu Xianwen. Paints and varnishes - Determination of moisture resistance - Part 2.
Condensation (exposure in a test chamber with a heated sink)
1 Scope
This part of GB/T 13893 specifies the application of coated coatings in a constant condensate environment or in alternating condensate environments. General conditions and procedures for the sample to ensure that test results between different laboratories can be reproduced. Note. The shape and preparation of the sample, the test time and the evaluation of the results are not included. 2 Normative references
The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this article. Pieces. For undated references, the latest edition (including all amendments) applies to this document. ISO 3270 paint and varnish and its raw material condition adjustment and test temperature and humidity (Paintsandvarnishesandtheirraw materials-Temperaturesandhumiditiesforconditioningandtesting)
ISO 4618 Paint and varnish terms and definitions (Paintsandvarnishes-Termsanddefinitions) 3 Terms and definitions
The terms and definitions in ISO 4618 apply to this document.
The ISO and IEC maintain a terminology database for standardization, which can be found at the following address. 4 logo
The condensate test environment has the following identifications.
Test environment.
---CH Condensation environment under constant humidity;
---AHT condensation environment when air temperature and humidity alternately change; --- Condensation environment when AT air temperature changes alternately. 5 Limitations
Temperature and humidity are important parameters that affect the test results. Deviation from regulatory requirements may result in incomparable results. However, related It was agreed that other parameters could be used and should be stated in the report. 6 Principle
Expose the coated sample to the condensing environment in the test chamber and then evaluate it according to the standards agreed by the relevant parties. These evaluation standards usually carry Subjective.
7 test environment
Due to the radiation effect of the tank wall or the cooling effect of the sample, the condensed water test environment will cause the moisture in the air to condense on the surface of the sample. Therefore, the temperature of the sample is lower than the temperature of the high humidity air in the environmental chamber. This section specifies that the air temperature in the environmental chamber is (40 ± 3) °C during the condensation process. The condensate test environment can be a constant humidity condensing environment (CH) or an alternating condensing environment (AHT, AT). If the change in ambient temperature and humidity has an important effect on the sample, in addition to the influence of condensed water on the sample, alternate condensing should be selected. surroundings.
The amount of condensed water formed on the surface of the coating may significantly affect the effect of water on the coating. The amount of condensed water is affected by the temperature or sample of the equipment installation environment. The effect of cooling.
The condensed droplets flowing down from the sample may, in addition to the condensed water, sometimes contain solids and liquids in which the coating is dissolved or mixed in the condensed water. Body composition.
Reproducible results can only be expected if the test procedure and test conditions remain the same during a series of tests. If alternating environmental conditions are used, the usual cycle time is 24h. AT test can also use a shorter cycle week Period (12h or 16h), two of which are shortened accordingly.
An overview of the test environment, cycle times and conditions is given in Table 1. Other cycles may be used as agreed by the parties concerned. Table 1 Condensation test environment
Test environment cycle time conditions when the working chamber reaches equilibrium Type code test cycle total air temperature relative humidity
Under constant humidity
Condensing environment
CH
From the beginning of heating to
End of exposure
(40±3) °C Relative humidity is about 100%, condensation on the surface of the sample Air temperature
And humidity
Change
Air temperature
Alternating change
AHT
AT
8h heating
16h cooling (box
Open or ventilated)
8h heating
16h cooling (box
shut down)
24h
24h
(40±3) °C
18 ° C ~ 28 ° C
(40±3) °C
18 ° C ~ 28 ° C
Relative humidity is about 100%, condensation on the surface of the sample Close to the surrounding environment
Relative humidity is about 100%, condensation on the surface of the sample Relative humidity is about 100% (≈ saturation)
Note. The set value and the fluctuation value of the runtime can be listed separately or in the format of "set value ± fluctuation value at runtime". The setting value is The target condition of the sensor when it is used by the control point is set by the user. The fluctuation value at the time of operation is the deviation from the set value at the control point. The reading of the calibrated control sensor during overbalance operation is displayed, but does not include measurement uncertainty. Runtime control point, run-time fluctuations It may not exceed the set value at the given balance. When the standard requires a specific setting value, the exact value is set by the user. Set value Specifying the fluctuation value at runtime does not mean that the user-set setting value is allowed to be higher or lower than the exact specified setting value. 8 instruments
8.1 Environmental Chamber
In a warm, humid environment, a gas-tight environmental chamber should be used. The inner wall material is corrosion resistant and has no sample influential. The environmental tank is usually equipped with a sink at the bottom to store the amount of water in accordance with 9.1. The environmental tank should be able to pass through the heated bottom tank Water to control temperature and humidity.
If the heat introduced by the heated water is not enough to raise the temperature of the air in the environmental chamber to the required value, then another one can be used. External heating device.
The heating time depends on the number and material of the sample, and also the ratio of the surface area of the water in the bottom tank to the environmental tank wall area and the water temperature. turn off. The water temperature should preferably not exceed 60 ° C to avoid excessive water vapor. The dimensions and temperature measurement and control devices of the environmental chamber are not mandatory, provided that the test conditions provided are consistent with Chapters 8 and 9.3. And can measure the temperature.
The environmental chamber should have a suitable door or other opening that can be closed for sample placement and ventilation. An example of an environmental box is shown in Figure 1.
Environmental tanks that are not equipped with a bottom sink should have additional means to ensure adequate condensate formation on the surface of the specimen. Description.
1---pressure reducing valve;
2---temperature measuring device;
3---The bottom sink with water.
Figure 1 Example of an environmental box
8.2 Installation of environmental chamber
The environmental chamber should be installed in a room with no corrosive substances in the surrounding environment (if it cannot be installed in a chemical laboratory), the room temperature is (23 ± 5) ° C, the relative humidity is not more than 75%. Free from air and solar radiation. Installation room when conducting comparative tests The chamber temperature in the chamber shall be the standard temperature (23 ± 2) °C in accordance with ISO 3270. Note. A drop in ambient temperature can result in an increase in the amount of condensed water on the surface of the sample. 8.3 Device for placing specimens
The device in which the sample is placed is made of a corrosion-resistant material and does not accelerate the corrosion of the sample. The specimen shall be placed as specified in 9.3. 9 Test procedure
9.1 Filling the bottom sink
If the instrument is equipped with a bottom sink, the water depth injected into the bottom sink should be at least 10 mm at any time during operation. The use of tap water may cause equipment to foul, so the quality of the water should meet the requirements of the equipment manufacturer. 9.2 Sample
Only coatings that do not interact with each other can be exposed together in the test chamber at the same time. If the sample is also affected by the amount of condensed water formed, it can be produced by comparing a test cycle or within 24 hours with the aid of a suitable test tool. The amount of condensed water produced determines the test environment (see 9.4). 9.3 Sample placement
When the sample is placed in the box, the angle with the horizontal plane should be greater than or equal to 60°, and the samples are not in contact with each other and can sufficiently radiate heat energy. The following minimum spacing requirements should be controlled.
--- Not less than 100mm from the wall of the box;
--- The bottom edge of the sample is not less than.200mm from the water surface; --- The spacing between adjacent samples is not less than 20mm.
Condensed water on the tank wall or ceiling or other specimens is not allowed to fall onto the specimen. Ensure condensation forms on all samples.
9.4 Determination of condensate volume comparison
The device specified below is used for the determination of the condensate volume comparison. A 18 mm x 180 mm test tube filled with water was used as a reference. The condensate dripping from the test tube should pass through a diameter of A 55 mm funnel was collected in a 10 mL graduated cylinder.
The device shall be placed in the available space between the other specimens as specified in 9.3, at the bottom of the test tube (for example, the test tube itself uses a nylon The position of the rope suspension is 50 mm higher than the edge of the funnel on the cylinder. 9.5 Test procedure
9.5.1 Booting
Place the sample in place, close the environmental chamber, and open the heater in the bottom sink or environmental chamber. Heating the environmental chamber to the first stage of the test The temperature of the air is sought; this temperature should be reached within 1.5 hours. Condensed water will form on the sample. If possible, observe the complete condensation of the sample surface through the window (if any). Under no circumstances should the cabinet be opened. If sufficient condensation is not formed, it can be adjusted, for example, by increasing the sample spacing, reducing the number of samples in the test chamber or changing the actual The environment of the laboratory.
9.5.2 Condensation environment at constant humidity (CH)
Maintain the air temperature in the environmental chamber as specified in Table 1 or agreed during the test. If an intermediate result evaluation is required, the sample can be taken out of the box without turning off the heating device, at 30 minutes. Put it back inside.
9.5.3 Condensation environment (AHT) when air temperature and humidity alternately change The test consists of a defined or agreed number of climate cycles, each consisting of the first and second test phases. After 8 h of starting (see 9.5.1), the heating device is turned off to end the condensation process (first phase of the test). Open the environmental box or let it ventilate. After another 16h, check the water level in the bottom sink, replenish the water as needed, close the environmental box, turn on the heating device and start a new one. cycle.
For the evaluation of intermediate results, the sample can be taken out of the box before starting a new cycle. But it should be within 30 minutes The sample is returned.
In special cases, the evaluation of the intermediate results can also be carried out immediately after the heating device is switched off and the environmental chamber is opened. 9.5.4 Condensation environment (AT) when the air temperature alternates The test consists of a defined or agreed number of climate cycles, each consisting of the first and second test phases. If it is a 24h cycle, after starting 8h (see 9.5.1), turn off the heating device to end the condensation process (the first stage of the test), the environmental chamber Keep it off.
After another 16 hours, check the water level in the bottom sink, replenish the water as needed, and turn on the heating unit to start a new cycle. For the evaluation of intermediate results, the sample can be taken out of the box before starting a new cycle. But it should be within 30 minutes The sample is returned.
9.6 Test interruption
Any test interruption time that occurs when altering the alternate environment should be compensated by extending the time of the second phase of the test, second order The segment test time is usually 16h. The compensation time should be added to the cycle of each interrupt. The time of interruption should be recorded in the test report, accurate To min.
9.7 End of test
The test is terminated when the specified degree of coating damage occurs, the specified test time or number of cycles is reached. 10 Assessment
10.1 Check the sample regularly, as short as possible, and do not damage the surface of the sample. Do not take the test sample for more than 30 minutes in any 24h. Immediately after the sample is taken out, a blank sample is placed in the original position in the test chamber. The sample can be dried with absorbent paper for more clear inspection and then That is, put it back in the box, the sample should not be completely dry. 10.2 Immediately after the end of the specified test period, check for abnormalities on the test surface, for example by referring to the appropriate part of ISO 4628. The regulations or the agreement of the relevant parties.
10.3 If necessary, place the specimen in an environment in accordance with ISO 3270 for a specified period of time and then check for abnormalities in the test surface. 10.4 If it is necessary to check the corrosion of the substrate, unless otherwise specified, remove the coating with a non-corrosive paint remover. 11 precision
Precision does not apply to this section because it is only an intensive test. The precision will be determined by subsequent evaluation of the intensified test specimen. 12 test report
The test report includes at least the following information.
a) all information necessary to fully identify the product under test, including description of the sample and pre-treatment (if applicable); b) indicate the part number;
c) the type of test environment (CH or AHT or AT) used, the number of cycles and duration of the test, and the reasons for terminating the test; d) the number and timing of any intermediate assessments performed;
e) If necessary, compare the amount of condensate according to 9.2, expressed in milliliters per cycle (mL/cycle) or milliliters per hour (mL/h); f) details of the treatment of the sample after the end of the test and before the start of the assessment; g) test results (including the results of each sample) and all other information required by the test standards used, in each case cited Relevant standards;
h) any deviation from the prescribed procedure, if the test is carried out in a different device than Chapter 8, detailing the ring used in the test Circumstances
i) any abnormal phenomena (abnormal phenomena) observed during the test; j) Test date.
references
[1] ISO 4628 (alparts) Paintsandvarnishes-Evaluationofdegradationofcoatings-Designa- Alignofquantityandsizeofdefects,andofintensityofuniformchangesinappearance

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