Page 97 - 《橡塑技术与装备》2022年12期

工艺与设备 姚丽颖·PA66 注塑导线槽脆断问题浅析

表 4 刚性增韧、柔性增韧材料与当前材料吸水率对比
序号 NO. 干态克重 /g 湿态克重 /g 吸水率 干态克重 /g 湿态克重 /g 吸水率 干态克重 /g 湿态克重 /g 吸水率
当前材料 刚性增韧 GF30% 柔性增韧 GF0%
1 117.01 119.66 2.26 119.51 120.18 0.56 115.32 122.27 6.03
2 117.03 119.86 2.42 120.38 121.06 0.56 115.32 122.16 5.93
3 117.01 119.78 2.37 119.89 120.58 0.58 115.33 122.43 6.16
4 117.02 119.73 2.32 119.28 119.96 0.57 115.3 121.99 5.80
5 117.02 119.67 2.26 119.68 120.36 0.57 115.31 122.41 6.16
6 117.01 119.72 2.32 120.08 120.75 0.56 115.32 122.57 6.29
7 117.01 119.60 2.21 119.38 120.09 0.59 115.32 122.41 6.15
8 117.01 119.60 2.21 119.76 120.56 0.67 115.33 122.63 6.33
9 117.03 119.68 2.26 120.15 120.88 0.61 115.3 122.32 6.09
10 117.02 119.79 2.37 120.14 120.79 0.54 115.33 122.43 6.16

式将其引导至其他位置。从而避免功能位置脆断。 别出可能影响产品成型的关键结构部位，以及可能造
（3）PA66 材料内玻纤含量会影响产品吸水性。 成产品物性不良的位置。通过优化设计从而避免后续
即玻纤含量越高，吸水性越差，对产品韧性造成的影 问题的发生。玻纤含量可以很大程度上影响塑料粒子
响越小。 的吸水性，较低的吸水量注定无法从根本上解决产品
由此可见，工程塑料材料本身的物性对成型后的 呈现出的物性。
产品起着决定性的影响。产品及模具设计时，应该识

Analysis on brittle fracture of PA66 injection molding wire slot

Yao Liying

(Tianjin Xinguang Kaile Auto Parts Co. LTD., Tianjin 301700, China)
Abstract: In the plastic injection molding production, the problem of brittle fracture of parts often occurs.
In order to find out the root cause and make corresponding improvement, this paper takes the PA66 material
as the research case of the automobile circuit protection conductor slot parts, and conducts research and
analysis from the aspects of equipment, mold, process, materials, water absorption, etc. The results show that
the glass fiber content in PA66 directly affects the toughness of injection molded products under appropriate
equipment and process conditions; The welding line will be formed at the void free position of the injection
molding part, which is relatively weak compared with other positions, and is prone to brittle fracture under
external force; Too high content of internal glass fiber will lead to the decrease of water absorption of the
product, and the increased toughness after water absorption is not enough to offset the physical defects of
the particles themselves.
Key words: PA66; brittle fracture; product structure; material composition; water absorption

（R-03）

2022 第 48 卷 ·41·
年