This standard specifies the artificial climate (xenon lamp) exposure test method reference to the adoption of the International Organization for Standardization ISO 4892-82 "Plastics Laboratory Light Source Test Methods," the xenon lamp light source part of the content.
1 Theme content and scope of application
This standard specifies the simulation of outdoor hot and humid natural atmosphere in the main factors of the two artificial climate accelerated test methods;
Fluorescent ultraviolet / condensation test method (hereinafter referred to as fluorescent ultraviolet method);
Artificial climate (xenon lamp) exposure test method (hereinafter referred to as xenon lamp method).
This standard applies to mechanical industrial products with plastics, coatings, rubber materials, different types of materials or the same type of materials with different formulations of outdoor weathering resistance to heat and humidity (hereinafter referred to as weathering) comparison; can also be used for known weathering materials for quality rating test.
The general test can be fluorescent ultraviolet light/condensation test method; and if necessary, and can be used to verify the product testing of artificial climate (xenon lamp) exposure test method.
The test results of this standard, can not simply and directly infer the service life of the material.
Note: This method references GB9344 xenon light exposure test method for plastics technical content.
2 terminology
2.1 UV - condensation test test of fluorescent UV-Condensationtype
To fluorescent ultraviolet lamps as a light source, simulate and strengthen the degradation of polymer materials the most significant impact of the ultraviolet spectrum, and the appropriate control of temperature, humidity, so that in the samples on the periodic production of condensation. Test.
2.2 artificial climate (xenon lamp) test test of exposure to artificialweathering (xenon arc lamp as lightsourve) to xenon lamp as a light source, simulate and strengthen the daylight spectrum to reach the ground, and appropriate control of temperature, humidity and water spraying conditions of the test.
2.3 ultraviolet regions ultraviolet regions
Ultraviolet distinction UV-A wavelength range of 315 ~ 400nm; UV-B wavelength range of 280 ~ 315nm; UV-C wavelength <280nm irradiation.
2.4 Fluorescent UV lamp fluoresvent UV lamp
is a low-pressure mercury lamp with a wavelength of 254nm, due to the addition of phosphorus **** deposit to make the conversion into longer wavelengths, fluorescent UV lamp energy distribution depends on the emission spectrum produced by the phosphorus **** deposits and the expansion of the glass tube.
2.5 irradiance irradiance
The total amount of incident irradiation at all wavelengths, expressed as W/m2. Because the irradiation is distributed according to different wavelengths, the photochemical effects caused by different spectra vary greatly, so should not use different lamps for comparison.
2.6 sub-spectral irradiance spectral irradiance
Indicates that the irradiance as a function of wavelength, expressed as a band of W / ㎡, usually the irradiance of daylight per 10nm band W / ㎡, and ultraviolet fluorescent lamps per 1 or 2nm, the sub-spectral irradiance is a suitable method of comparing different energy distribution of light sources.
2.7 spectral energy distribution spectral energy distribution
It is the characteristic curve for each wavelength of irradiance, which can be expressed in terms of power in terms of W/m2, or in terms of energy in terms of J. This characteristic curve should include all the wavelength ranges of the incident light, and fluorescent UV lamps are usually expressed in terms of relative spectral energy distribution, which is expressed in terms of irradiance in terms of each wavelength versus the energy distribution of the wavelength. The irradiance at each wavelength is expressed as a percentage compared to the peak value (see Figure 3).
3 Test Equipment
3.1 Fluorescent Ultraviolet Test
3.1.1 The structure of the test chamber is made of corrosion-resistant metal material and contains eight fluorescent ultraviolet lamps, a water holding tray, test specimen holders, and a temperature and time control system and indicators (see Figure 1).
Figure 1 Cross-section of the structure of fluorescent UV/condensation test chamber
3.1.2 The fluorescent UV lamp shall be started quickly, the lamp power is 40W, the lamp length is 1220㎜, and the range of the test chamber's uniform working area is 900×210㎜ (see Figure 2).
Figure 2 The range of uniform irradiation area of the test box
3.1.3 Unless otherwise specified, the fluorescent ultraviolet lamp wavelengths of 280 ~ 315nm, that is, the UV-B wavelength range, the relative spectral irradiance characteristics (see Figure 3).
Figure 3 Relative spectral irradiance of UV-B fluorescent ultraviolet lamp
3.1.4 Lamps are installed in a row of four, in two rows, with lamps in each row installed parallel to each other, and the center of the lamps are at a distance of 70㎜ (see Figure 1).
3.1.5 The test specimen shall be fixedly installed at a position 50㎜ from the nearest parallel surface of the lamp (see Figure 1). The test sample and its support constitute the inner wall of the box, their back should be exposed to room temperature cooling air, due to the temperature difference between the test sample and the air inside the box, so that the condensation stage of the test sample surface to produce stable exposure conditions, the test box should be from the bottom of the outer wall of the box through the box and the test sample of the channel to produce natural air convection.
3.1.6 water vapor generated by heating the bottom of the box water pan, the depth of water is not greater than 25 mm, and there is an automatic controller for water supply, water pan should be cleaned regularly to prevent the formation of scale.
3.1.7 The temperature of the test box is fixed at 75 mm wide, 100 mm high, 2.5 mm thick black aluminum plate (hereinafter referred to as the blackboard) connected to the sensor to measure the blackboard should be placed in the center of the exposure test area, the thermometer's measuring range of 30 ~ 80 ℃, tolerance ± 1 ℃, light and condensation phase control should be rewarded individually, condensation phase by heating water temperature control.
3.1.8 The test chamber shall be placed in the test room with the temperature of 15~35℃, 300㎜ away from the wall, and shall be prevented from the influence of other heat sources, and the air in the test room shall be kept in a strong circulation, so as not to affect the conditions of light and condensation.
3.2 Xenon lamp artificial climate test
3.2.1 Xenon lamp emitted light source wavelength range is from less than 270nm up to the infrared region, xenon lamps should be filtered through the appropriate filtering and effective cooling, filtering out the shorter wavelengths of rays and more infrared rays, straight to the surface of the test specimen reached the spectra of the spectrum of sunlight reaching the ground is similar to the spectrum.
3.2.2 test chamber with a rotating support to drive the rotation of the sample, temperature, humidity, water spray time and xenon lamp power should be adjustable, and a dry, wet bulb temperature automatic recording device. Dry, wet bulb temperature sensor should be placed in the light. According to the needs of the box can be prepared outside the power regulator, the box is equipped with a heater.
In order to reduce the xenon lamp cooling water pollution lamps and filters, cooling water with distilled or deionized water, cooling water made of water corrosion-resistant materials, such as stainless steel, plastic, etc., should be avoided to use aluminum, copper, iron and bronze.
3.2.3 Sample frame should be made of sui materials, such as aluminum alloy, stainless steel or wood, adjacent to the sample to avoid bronze, copper and iron components.
4 test conditions
4.1 Fluorescent ultraviolet test
4.1.1 test sample fixtures in the sample holder, facing the fluorescent lamp. When the specimen does not fill the sample holder completely, it is necessary to fill the sample holder with a blackboard to keep the inner wall of the test chamber closed.
4.1.2 test temperature, light can be used 50, 60, 70 ℃ three kinds of temperature, priority is recommended to use 60 ℃; condensation stage of the temperature is 50 ℃, the temperature tolerance are ± 3 ℃.
4.1.3 The cycle of light and condensation can choose 4h light, 4h condensation or 8h light, 4h condensation two cycles.
4.1.4 After 400 to 450h of light, each row of lamps need to be replaced by a fluorescent tube, the other lamps according to Figure 4 shows the conversion of the position, the effective life of the lamps 1600 to 1800h.
4.1.5 When replacing the lamps, the water holding tray should be wiped dry and cleaned, to avoid the formation of scale.
Figure 4 Conversion diagram of fluorescent lamps
4.2 Xenon lamp artificial climate test
4.2.1 Radiation intensity in the wavelength range of 300 ~ 890nm for 1000 ± 200 W / ㎡; less than 300nm should be no more than 1W / ㎡; in the area of the hanging test samples, the deviation should be less than 10 ﹪.
4.2.2 The temperature of the test chamber is measured by the blackboard, which is 63±3℃. It may also be 55±3°C or higher than 63°C as required, but higher temperatures may produce thermal aging effects that may affect the test results.
Readings should be taken when the temperature of the blackboard has stabilized without spraying water.
4.2.3 The relative humidity can be selected from 65 % ± 5 %, 50 % ± 5 % or 90 % ± 5 %.
Relative humidity readings should be taken when stabilized without water spray.
4.2.4 The water spray cycle can be selected every 102min spray 18min or every 48min spray 12min.
4.2.5 Xenon lamps and filters in the use of the process of gradual deterioration, the deposition of scale or for other reasons, resulting in a decline in the intensity of the irradiation, it is necessary to carry out the monitoring of light energy. In the determination of light energy, the photoreceptor should be fixed in the same position with the test sample to receive light energy, when the measured light energy has weakened or decreased, the xenon lamp power should be adjusted, if necessary, clean the xenon lamp and filter, xenon lamps and filters have a certain life expectancy should be used in accordance with the provisions of the time to a certain period of time to be replaced.
5 test cycle
The two test methods recommend the following test cycle:
4, 7, 14, 21, 28, 42, 63, 84 d.
According to the rate of change in the performance of the test samples, the test cycle can be appropriately changed; the final period of time according to the performance of the test samples to reach the specified value to determine the performance of the test samples, generally not more than 105d.
6 test samples should be adjusted. p>
6 test samples
Generally should be based on the performance to be determined, according to the relevant provisions of the preparation of standard samples, paint test samples should be caused by 75 ㎜ × 150 ㎜ × 1.0 ~ 1.5 ㎜. Such as mechanical properties of the test, the test sample should have a sufficient number to ensure that the expected test results can be achieved.
The two test methods still have the following requirements:
6.1 Fluorescent ultraviolet test
6.1.1 The maximum thickness of the test specimen shall be not more than 20㎜ to ensure that sufficient heat exchange to produce condensation on the test specimen.
6.1.2 For plastic, rubber, and other bar-shaped test specimens shall be fixed to aluminum alloy or other panels with good corrosion resistance and transmission properties.
6.1.3 For paint test specimens on steel backing plates it shall be so that rust on the edges does not stain the surface of the test specimen.
6.1.4 The holes larger than 1mm on the test specimen shall be sealed to prevent water vapor from escaping.
6.2 Xenon lamp test
Test samples in the sample holder should not be externally applied pressure, in order to avoid the exposure of test samples due to the different positions caused by the surface of the different intensity of light irradiation, in the installation of the test samples, according to the size and shape of the test samples, reasonably arranged and fixed in the rotating bracket, and can be switched to a position, such as up and down rows of switches, in situ 180 ° Flip, up and down rows swap, in situ 180 ° flip, after four steps constitute - exchange cycle. In the exchange cycle, each step of the exchange time is equal.
7 test sample performance evaluation
7.1 Appearance evaluation
The main appearance of the paint is the evaluation of the appearance of plastics and rubber can also be evaluated when necessary, check the project is mainly gloss, color change (color difference), chalking, spotting, blistering, cracking, and dimensional stability, etc., and should try to use the instrument to quantify the project testing, such as gloss, color difference, etc. .
7.2 Mechanical properties and other performance evaluation
General rubber materials for tensile strength, elongation, hardness measurement, plastic measurement of impact strength, elongation at break, tensile strength, bending strength. If necessary, other performance test items can be specified.
8 test report
a. Test method: fluorescent ultraviolet light test or xenon lamp test;
b. Test conditions: light time, condensation or water spray time and the corresponding temperature, humidity, fluorescent ultraviolet light spectrum or xenon lamp test the intensity of the radiation illumination;
c. Test time;
d. Test material name and model;
d. Test material name and model number;
d. Test material name and model number;
d. Test material name and model number;
e.
e. Size and method of preparation of test specimen;
f. Test equipment: equipment model, specifications, type of xenon lamp and filter for xenon lamp test;
g. Test results;
h. Date and person conducting the test.
Additional Notes:
This standard is proposed by the Chinese people*** and the state machinery and electronics industry.
This standard by the Ministry of machinery and electronics industry, guangzhou electrical appliances scientific research institute under the centralization.
This standard is responsible for drafting by the Ministry of machinery and electronic industry, Guangzhou electrical appliances scientific research institute.
The main drafter of this standard Liang Xingcai, Gao Ren Yi
This standard provides for fluorescent ultraviolet / condensation test method, reference to the use of the American Society for Testing and Materials ASTMG53-84 "non-metallic materials exposure fluorescent ultraviolet / condensation type test method".