During the test, the ventilation type aging test chamber must consider the test termination time. Generally speaking, the rubber property changes with time is of an exponential type. During the first period of time, its performance declines rapidly, and then the performance change is relatively smooth and lasts for a long time. If the accelerated aging time is too short, it will cause the aging characteristics of the first stage of the material to replace the aging characteristics of the entire process, resulting in too conservative prediction results; if in the accelerated aging test, the sampling interval is too long, so that the adjacent number changes If the gradient is too large, the accelerated aging curve derived from these data will seriously deviate from the actual accelerated aging curve, thereby distorting the prediction result. Therefore, when the performance of the material decays to a certain degree, it no longer meets the requirements for use, and the performance of the material at this time is its critical value. Generally speaking, people are concerned about the performance change of the material before reaching the critical value, so the test time should be at this time or a little longer. As for the sampling interval, according to the aging characteristics of the rubber material, the sampling interval after the start of the test should be shorter, and then it can be lengthened appropriately. The general principle is that the performance change gradient should not be too large, generally not more than 10%. The time setting of the ventilating aging test box made by Yashilin adopts (Korea ternary) imported digital display high-precision integrated controller, adopts thermal balance temperature adjustment method; temperature control adopts P · I · D + S · S · R system Coordinated control with the same channel; with automatic calculation function, the temperature change conditions can be corrected immediately, so that the temperature control is more accurate and stable. Within the rated temperature range, the program can be heated up-constant temperature-standby according to the needs of the work. After the operator sets the program, the instrument works according to the program, and automatically shuts down (standby) after completion.
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December 13, 2020