This device is suitable for predicting the relative durability of metal materials such as paints, coatings, and plastics through light and water exposure accelerated aging tests. It is especially suitable for observing the physical property damage of particularly durable materials, such as gloss reduction, haze, strength reduction, chalking, Cracking, blistering, embrittlement and fading etc.
Like other laboratory accelerated tests, the test results of this device cannot be used to replace natural exposure to determine the actual durability of the material, but the comparative test conditions provided by this device are useful for quickly evaluating the anti-aging performance of materials, screening or improving new and old formulations , Monitoring product quality is relatively practical.
Since ultraviolet light is the main lighting factor that causes the durability of outdoor products to decrease, coupled with the relatively stable spectral energy distribution and low price of fluorescent tubes, ultraviolet aging Test Chambers have become the most widely used in the world due to their advantages of speed, convenience and economy. The weather resistance test model. As a simple model, this device is especially suitable for laboratories with limited economic conditions.
The design of the rotating sample frame used in this device can well compensate for the unevenness of light radiation caused by many factors such as lamp aging and batch differences, saving the heavy workload of regular instruments that need to exchange sample positions in sequence .
Since moisture is an important destructive factor for accelerated aging, this device uses water spraying to simulate the influence of moisture. By setting the spraying time, it can be relatively close to some end-use environmental conditions, such as mechanical erosion caused by drastic temperature changes or rain erosion.
In order to meet the sturdy and durable use requirements of the weather resistance testing machine, the structural parts of the device are generally made of corrosion-resistant stainless steel materials. The design strives to be simple in structure, easy to use and maintain.
You only need to pay a relatively low cost of use, so that you can understand the material damage that can only be formed under natural conditions for a long time in a short period of time, and determine the quality gap between the test product and the control model.
According to the standard GB/T1865-2009; ISO11341:2004 "Paints and Varnishes Artificial Weathering and Artificial Radiation Exposure", the temperature of the Test Chamber should be controlled at 38±3oC during the artificial weathering process; the relative humidity should be 40%~60% Carry out artificial weathering test.
Preparations before the test
1. The test box should be firmly placed on a flat place away from strong airflow and strong magnetic field interference.
2. The test box should be reliably grounded.
3. Carefully remove dust, rust, dirt and residual water stains in the test area.
4. Open the door and inject deionized water into the bottom of the Test Chamber. The conductivity of the water is less than 5us/cm, the solid solution in the water is less than 1ppm, and the silicon dioxide is less than 0.1ppm. The water surface should be close to the drain grid. (Try to add enough water for the test at one time, so as to avoid the temperature drop when adding water multiple times, so as to affect the test accuracy.)
5. Prepare a control sample that has similar composition and structure to the sample and has the same specifications. The performance of the control sample is confirmed through standard outdoor exposure tests or other methods. The mode of failure in the satisfactory case is that of the test material, which has relatively good durability and the other has relatively poor durability. In order to ensure the statistical evaluation of the test results, several replicate samples should be prepared for various samples and control samples.
6. Install the sample and control sample on the sample turret to ensure reliable clamping and symmetrical distribution. It is recommended to fill blank samples in the vacant positions to maintain consistent test conditions.
7. Close and securely lock the warehouse door.
keyboard description
The aging box controller has a total of six keys, the number key "↑", the shift key "→", the "Setting" key, the "Reset" key, the "Run/Stop" key, and the "OK" key.
Steps
1. Turn on the "power", then the LCD will display "Welcome to use LUV-II aging box, service call 021-52821266" for 3 seconds and then enter the main menu.
2. Parameter setting (the operation is valid when the instrument is stopped)
① Timing time setting: press the "Setting" key, the LCD liquid crystal enters the parameter setting selection menu, at this time "▼" points to "Timing time setting" and flashes, press the "Enter" key to enter the timing time setting menu, then The highest digit of the hour setting "hour" flashes, indicating that this digit is activated. Press the number "↑" key to change the value to be set, and use the shift "→" key and the number "↑" key to set the desired value. Press the "OK" key to save the timing setting value into the computer memory, and the LCD will return to the main menu at this time.
②Spray time setting: press the "Setting" key, the LCD liquid crystal enters the parameter setting selection menu, at this time "▼" points to "time setting" and flashes, press the shift "→" key to make the "▼" Point to "Spray Time Setting", press "Enter" key to enter the spray time setting menu, at this time, the highest digit of "Hour" of the water spray setting time flashes, indicating that this bit is activated, press the number "↑" key to Change the value that needs to be set, and set the required water spray/stop spray time by shifting the "→" key and the number "↑" key, and press the "OK" key to save the spray setting value into the computer memory. When the LCD liquid crystal returns to the main menu.
③Test temperature setting: press the "Setting" key, the LCD liquid crystal enters the parameter setting selection menu, at this time "▼" points to "time setting" and flashes, press the shift "→" key to make "▼" point to "Test temperature setting", press the "OK" key to enter the test temperature setting menu, at this time the highest digit of the set temperature flashes, indicating that this digit is activated, press the number "↑" key to change the value that needs to be set, Set the required test temperature by shifting the "→" key and the number "↑" key, press the "OK" key to save the temperature setting value into the computer memory, and the LCD will return to the main menu at this time. (Note: The temperature can only be set within the range of 40°C-60°C)
④Reset function: Press the “Reset” button when the LCD is in the main menu and the instrument stops working, and the “current running time” will flash. After pressing the “OK” button, the “current running time” will be reset to zero. If you press the "Reset" key twice in succession, the reset function will be exited.
3. The function buttons are "timing", "rotation", "temperature control" and "spray", and the corresponding function buttons are turned on according to the test needs.
① "Timing" button, after turning it on, press the "Run/Stop" button, the instrument starts to work, and when the set time is reached, the instrument stops working. (Note: If the "timing" function is not turned on, the instrument will automatically stop working after 1000 hours.)
② "Rotate" button, after turning it on, press the "Run/Stop" button, and the specimen turret starts to rotate at a constant speed.
③ "Temperature control" button, after opening, press the "Run/Stop" button, after the temperature in the aging box reaches the set temperature value, it will enter the constant temperature state.
④ "Spray" button, after turning it on, press the "Run/Stop" button to enter the spray mode, and the water pump works intermittently according to the set spray/stop spray time.
(Note: ① At least one function button must be turned on. If none of the function buttons is turned on and "no load", when the "Run/Stop" button is pressed, the buzzer will emit a "beep" warning sound. ② In the timing function When it is turned on, if the current running time is greater than or equal to the set timing time, when the "Run/Stop" button is pressed, the buzzer will emit a "beep" warning sound and the "current running time" displayed on the LCD will flash.)
4. Query function
When the instrument is running, press the "Setting" key for the first time, and the LCD will enter the "timing and remaining time check interface", press the "Setting" key for the second time, and the LCD will enter the "Water Spray, Stop Spraying and Remaining Time" interface. Inquiry interface", press the "Setting" key for the third time, the LCD liquid crystal enters the "Temperature setting inquiry interface", press the "Setting" key for the fourth time, the LCD liquid crystal display returns to the main menu. (Note: ①Press the "OK" button in any query interface and the LCD liquid crystal can return to the main menu, ②Press the "Run/Stop" button in the query state to be invalid.)
5. At the end of the test, open the warehouse to pick up the parts after confirming that the power is off.
6. Drain the water at the bottom of the tank and effectively clean the test area.
Precautions
1. Although the UVB light source with high irradiance level can better accelerate the test process, it sometimes causes aging damage to some materials than natural exposure, such as excessive discoloration. Therefore, this factor should be paid attention to when judging samples that are different from the control model.
2. Do not use uncertified non-special lamps.
3. Full-time personnel on duty should be equipped to monitor the aging and safety status during the full scale of the test.
4. It is necessary to open the door or replace the lamp tube under the premise of turning off the power.
5. When not wearing goggles, do not directly observe the lit UV lamp with naked eyes. to avoid skin burns.
6. If the water level is lower than the critical water level, the buzzer will emit a "beep" alarm sound and the low water level cursor "◆" on the LCD liquid crystal display will flash, and deionized water should be replenished in time to avoid the pump running in an anhydrous state.
7. If the test area is not clean and deionized water is not used, water stains will be formed on the sample that hinder the observation, and it will also affect the service life of the equipment components.
8. During the whole test scale, the cooling fan on the electrical box should be guaranteed to run normally.
9. It is necessary to prevent inexperienced non-professionals from changing the setting parameters at will.
10. The control samples should be installed in the axisymmetric positions of the turntable respectively to obtain equivalent lighting conditions.
11. This device is a thin-plate-intensive mechanism, and attention should be paid to safety during operation and maintenance to prevent scratches.
