The ultraviolet aging test chamber can reproduce the damage caused by sunlight, rain and dew. The equipment conducts the test by exposing the material to be tested in a controlled alternating cycle of sunlight and moisture while increasing the temperature. The fields involved are paint, ink, paint, resin, plastics, printing and packaging, adhesives, automobile and motorcycle industry, cosmetics, medicine and other industries.

(1) UV cycle of ultraviolet aging test box

The first-level photochemical reaction is not sensitive to temperature changes. However, the speed of the subsequent secondary reaction is closely related to temperature changes. Generally speaking, as the temperature increases, the reaction speed will increase. Therefore, during the UV exposure test, temperature control is very important. It is more important to match the test temperature used in the accelerated test with the highest temperature encountered in the actual application of the material. The UV temperature setting in the device can be any point from 50 ° C to 80 ° C, depending on the light level and indoor ambient air temperature. The temperature adjustment of the equipment is accomplished through a series of systems such as air heaters, water heaters, etc. in the equipment through a controller with a microcomputer calculation function.

(2) Moisture circulation in ultraviolet aging test box

As the temperature increases, the destructive power of moisture on the material will increase dramatically. Therefore, in the process of wet exposure, temperature control is the most basic requirement. Furthermore, in order to produce an acceleration effect, it is required to maintain a high temperature environment during the wet exposure. The temperature setting of the condensation process in the equipment can be any point from 40 ° C to 60 ° C.

(3) Heating system of ultraviolet aging test box

1.Using U-shaped titanium alloy high-speed heating electric heating tube;

2. Temperature control and lighting are completely independent systems;

3. The temperature control output power is calculated by the microcomputer to achieve high-precision and high-efficiency power consumption benefits;

4. With anti-overtemperature function of heating system;

The temperature of the black aluminum plate is controlled and heated by the intelligent "Autonics" series temperature controller. The output power is calculated by the microcomputer and the PID is automatically set. Monitoring adopts standard Pt-100 blackboard temperature sensor;

The temperature of the water tank is also controlled by the "Autonics" temperature controller. The water tank is located in the lower part of the box and has an electric water heater. During the cycle test, there is a dark condensation process in the test section. It needs to generate saturated water vapor at a higher temperature in the cabinet. When the water vapor encounters a relatively cold sample surface, dew will condense on the sample surface.

Despite the national standard and the current domestic aging resistance test method is xenon arc radiation, foreign xenon arc radiation and ultraviolet light irradiation are widely used test methods, these two methods use completely different principles. The xenon lamp aging test chamber imitates the entire solar spectrum, including ultraviolet light, visible light and infrared light, and its purpose is to simulate sunlight. The ultraviolet aging test box does not imitate the sun's rays, but only imitates the destruction effect of the sun's rays. It is based on the principle that long-term exposure to durable materials outdoors is the most aging-damaged by short-wave ultraviolet light.

One of the most important advantages of the UV aging test box is that it can simulate the destruction of the material in a more realistic outdoor humid environment. According to statistics, the material is frequently exposed to moisture for at least 12 hours a day when placed outdoors. Because this damping effect is mostly manifested as condensation, special condensation principles are used in artificial weathering tests to mimic outdoor humidity.

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