Low-temperature-resistant low-water-absorption low-expansion modified nylon material and preparation method thereof

The invention discloses a low-temperature-resistant low-water-absorption low-expansion modified nylon material and a preparation method thereof. The modified nylon material is prepared from the following raw materials in parts by weight: 100 parts of nylon 66, 40-60 parts of nylon 610, 40-60 parts of polycarbonate, 6-14 parts of a toughening agent and 0.5-1 part of an antioxidant. The water absorption rate of the modified nylon material is as low as 0.25%, and the water absorption rate is relatively low; meanwhile, the low-temperature performance of the modified nylon material is superior to the normal-temperature performance, the low-temperature characteristic is better, and the linear expansion coefficient of the modified nylon material can be as low as 21 * 10 DEG C within the temperature range of-50 DEG C to + 70 DEG C. 本发明公开了一种耐低温低吸水低膨胀改性尼龙材料及其制备方法，所述改性尼龙材料包括如下重量份的原料：尼龙66 100份、尼龙610 40～60份、聚碳酸酯40～60份、增韧剂6～14份、抗氧化剂0.5～1份。本发明改性尼龙材料吸水率低至0.25％，吸水率较低；同时，本发明改性尼龙材料的低温性能优于常温性能，低温特性较好，且其在-50℃～+70℃温度范围