UV light aging test chamber This device is applicable to the water exposure aging test of coating, rubber and other non-metallic materials. Because the ultraviolet ray in the sunlight is the main factor that causes the oxidative degradation of polymers, and the moisture is the important destructive factor that accelerates the aging, the device has the characteristics of quickly and easily simulating outdoor exposure aging, and has practical value for testing the relative weathering of different test pieces.
UV light aging test chamber This device is applicable to the water exposure aging test of coating, rubber and other non-metallic materials. Because the ultraviolet ray in the sunlight is the main factor that causes the oxidative degradation of polymers, and the moisture is the important destructive factor that accelerates the aging, the device has the characteristics of quickly and easily simulating outdoor exposure aging, and has practical value for testing the relative weathering of different test pieces.
2、 Reference standard:
GB/T14522-1993 Accelerated weathering test method for plastics, coatings and rubber materials used in mechanical industry products
ISO11507.1997 Paints and varnishes Coatings exposed to artificial weathering Exposure to fluorescent UV lamps and water
GB/T 16422.1-2006 Plastics Laboratory Light Source Exposure Test Method
ASTM D4329 Standard Test Method for Fluorescent UV Exposure Testing of Plastics
GB/T16585-96 Standard for ultraviolet aging test chamber
ASTM D1148-2007 Chinese version of rubber ultraviolet photochromic standard
3、 Technical parameters:
Temperature range: RT+10 ℃~70 ℃
Temperature uniformity: ± 3 ℃
Humidity range: ≥ 95% RH
Inner center distance of lamp tube: 65~70mm
Distance between test object and lamp center: 55mm
UV lamp: UV-A wavelength 280 ～ 340nm
Standard test piece: 75 × 150mm
Studio size: 450 × one thousand one hundred and sixty-five × 500 mm (deep × wide × High)
Overall dimension: 600 × one thousand three hundred and twenty-five × 1480 mm (deep × wide × High)
Liner material: SUS304 # stainless steel plate
Shell material: SUS304 stainless steel plate
Lamp tube: UV-A ultraviolet lamp tube, 8 in two rows, 40W/piece
Water source and consumption: 8 liters/day of clean water or distilled water (provided by the customer)
Control system: TEEM series touch screen controller, programmable.
4、 Structure introduction:
The structure of the ultraviolet light aging test chamber is made of corrosion-resistant 304 # stainless steel metal material, including 8 fluorescent ultraviolet lamps, water trays, test sample racks, temperature and time control systems and indicators.
The lamp power is 40W, and the lamp length is 1200 mm. The range of uniform working area of the test chamber is 900 × 210㎜。
The lamps shall be installed in four rows and two rows. The tubes of each row of lamps shall be installed in parallel with the center distance of 70 mm.
The test sample is fixed and installed at a position 50 mm from the nearly parallel plane of zui on the surface of the lamp. The test sample and its bracket are composed of
The inner wall and the back of the box are exposed to the cooling air at room temperature due to the temperature difference between the test sample and the air in the box. send
The condensation stage on the surface of the test sample produces stable condensation conditions. The test chamber shall pass through the outer wall of the chamber and the test sample from the bottom
Natural air convection is generated by the passage of.
The water vapor is generated by the water pan at the bottom of the heating box, the water depth is not more than 25 mm, and there is an automatic water supply controller. The water pan should be cleaned regularly to prevent the formation of scale.
The temperature is measured by a sensor fixed on a black aluminum plate (blackboard) with a width of 75mm, a height of 100mm and a thickness of 2.5mm
The blackboard shall be placed in the central area of the exposure test. The measuring range of the thermometer is 30~80 ℃, and the tolerance is
± 1 ℃. The control of illumination and condensation stage shall be conducted separately, and the condensation stage shall be controlled by the heating water temperature.
The test chamber shall be placed in the test room with a temperature of 15~35 ℃, 300 mm away from the wall, and shall be protected from other heat sources
The air in the test room should not be strongly circulated to avoid affecting the lighting and condensation conditions.
5、 Test conditions
The test sample is fixed on the test frame, facing the fluorescent lamp. When the sample frame is not filled, it is necessary to use a blackboard to
Fill the sample rack and keep the inner wall of the test chamber closed.
Test temperature. Three temperatures of 50, 60 and 70 ℃ can be used for illumination, and 60 ℃ is preferred; Temperature of condensation stage
The temperature is 50 ℃, and the tolerance uniformity of temperature is ± 3 ℃.
The cycle of light condensation can be 4H light, 4H condensation or 8H light, 4H condensation.
After * times of illumination of 400~450H, each row of lamp tubes needs to be replaced with one fluorescent lamp, and other lamps should be replaced according to the lamp cycle
To compensate for the loss caused by lamp aging. This operation mode ensures that the service life of each lamp tube is 1600~
1800H。
When replacing the lamp tube, the water pan should be wiped dry and cleaned to avoid scale formation.
6、 Test sample and performance evaluation
Appearance evaluation: the evaluation of coating is mainly about the appearance. Plastic and rubber can also be evaluated and inspected if necessary
The main items are gloss, color change, chalking, spots, blistering, cracks and dimensional stability. Try to use the instrument
It is used for quantitative item detection, such as gloss and color difference meter.
Evaluation of mechanical and other properties: tensile strength, elongation, hardness measurement and plastic measurement for general rubber materials
Impact strength, elongation at break, tensile strength, bending strength, and other performance test items can be specified if necessary
