Case Study of Sealing Automotive Air Conditioning Temperature Sensors: EP 1710 Epoxy Sealing Adhesive Solution for High Waterproof Performance

With the continuous improvement of automotive intelligence, comfort, and durability requirements, the stable operation of onboard sensors has become a key link in ensuring the performance of the entire vehicle. Among them, the automotive air conditioning temperature sensor, as the core component for regulating cabin temperature, has a direct impact on the response speed and comfort experience of the in car air conditioning system in terms of accuracy and reliability. However, in long-term use, sensors often face a serious challenge – condensation water seeps in, causing internal thermistor failure. How to provide long-term and reliable waterproof protection for temperature sensors has become an important issue in the design of automotive electronic materials. 1、 Project background: Performance challenges under condensed water erosionDuring the operation of the car air conditioning system, especially in humid or high temperature environments, condensation water is easily generated on the sensor surface. These water droplets may seep into the interior along the leads or seams, and once they enter the poorly sealed sealing area, they will reach the thermistor area, causing deterioration or even complete failure of electrical performance.Traditional sealing materials often perform poorly in the face of this “boiling water” environment. High temperature and high humidity conditions can accelerate the aging of colloids, leading to decreased insulation performance, lower breakdown voltage, and water absorption expansion. To this end, the vehicle manufacturer has added a rigorous testing project -1000 hours of 85 ° C water boiling test, and determines whether the material is qualified by comparing the changes in insulation resistance and withstand voltage performance before and after the test. 2、 Analysis of adhesive requirements: not only waterproof, but also durableAccording to the testing standards and application scenario requirements proposed by the customer, the sealing adhesive for automotive air conditioning temperature sensors needs to meet the following…