Any improvement in the original properties of nylon 66 through mechanical, physical, chemical, and other means can be called modified nylon 66. The application range of modified nylon 66 is also extensive, and almost all the properties of nylon 66 resin can be improved by modification methods, such as appearance, aging resistance, wear resistance, flame retardancy, and cost.

Glass fiber reinforced modification is a common way of physical modification of plastic materials. PA66 material reinforced with glass fiber not only improves its physical properties but also enhances the stability of the product. However, moisture absorption of nylon materials is an inevitable problem during production. Moisture absorption not only affects the dimensions of nylon products but also influences the mechanical properties, thereby affecting the overall use of connector products. In order to evaluate the stability of the product, experiments need to be conducted. Meanwhile, during the experimental process, some regularities can be found through changes in process data to know about the design of the connection and the packaging, storage, transportation, and other aspects of the product. This experiment mainly compares the connector products with 15%, 30%, and 50% different glass fibers, placed under constant temperature and humidity conditions, with one group placed naturally and another group soaked in water to simulate extreme conditions. The size and performance changes of the two groups of samples are monitored over time.

Through a series of experiments, the following conclusions are drawn:

(1) The size stability of PA66 material is poor, and its size changes significantly under both natural placement and soaking conditions, with more obvious changes after soaking, which accelerates its own water absorption process. The size change range in the direction of injection is smaller than that in other directions. This feature can be considered in product design by placing critical dimensions in the injection direction.

(2) The terminal retention force of PA66 material samples decreases on the 7th day, whether they are placed naturally or soaked in water, with more obvious changes under soaking conditions. The rebound occurs on the 14th day, and it shows a slow downward trend subsequently.

(3) Thí nghiệm này cho thấy lực giữ đầu cuối của các đầu nối vật liệu PA66 sẽ giảm khi chúng hấp thụ độ ẩm, bất kể chúng có bị ngâm nước hay không, chỉ có thời gian thay đổi. Độ ẩm càng cao thì càng giảm nhanh. Để thay đổi tình trạng này, cần phải thay đổi môi trường đặt đầu nối, chẳng hạn như thêm bao bì kín hoặc chất hút ẩm, v.v. Việc bổ sung các biện pháp này có thể kéo dài tuổi thọ của đầu nối vật liệu PA66.