东莞市恒磊塑胶有限公司
美国首诺PA66 VYDYNE R228 产品说明：
Vydyne R228 is a 40% mineral-reinforced PA66 resin formulated for improved impact strength. Available in black, it is an injection-molding grade formulated to retain the inherent processing advantages of unreinforced PA66 while enhancing rigidity, strength and heat resistance. Vydyne R228 maintains the chemical resistance typical of PA66 to a wide variety of chemicals, gasoline, oils, greases and solvents.
Vydyne R228 resin utilizes a unique mineral-reinforced PA66 system developed by Ascend Performance Materials to satisfy the market need for a high-rigidity thermoplastic as an alternative to certain metals. This mineral system provides two key features:
(1) isotropic behavior-property development in molded parts is usually independent of flow direction.
(2) a reduction in the tendency to develop sink marks in heavy cross sections such as molded-in bosses and ribs.
While not sink-free, parts made from Vydyne R228 can often permit boss and rib design or wall cross section changes that would not be tolerable in other unreinforced thermoplastic materials. Thus Vydyne R228 resin offers more uniform molded part strength and performance, as well as wider latitude in part design.
Vydyne R228 resin is a workhorse of Ascend Performance Materials" full line of mineral-reinforced PA66 resins, providing the best overall balance of properties. Vydyne R228 is heat stabilized and designed to provide increased ductility and reduced melt viscosity vs. unreinforced materials.This ductility improvement results in tougher, more impact-resistant molded parts. The reduction in melt viscosity enhances overall ease of injection-molding, resulting in minor reductions in tensile strength, modulus and heat distortion temperature. Parts manufactured from Vydyne R228 have successfully withstood paint bake oven cycles without significant loss of either dimensional stability or part properties.
| 机械性能 | 干燥 | 调节后的 | 单位制 | 测试方法 |
|---|---|---|---|---|
| 拉伸模量 (23°C) | 6900 | 2600 | MPa | ISO 527-2 |
| 拉伸应力 (屈服, 23°C) | 103 | 73.0 | MPa | ISO 527-2 |
| 拉伸应变 | ISO 527-2 | |||
| 屈服, 23°C | 1.5 | 16 | % | ISO 527-2 |
| 断裂, 23°C | 6.0 | 30 | % | ISO 527-2 |
| 弯曲模量 (23°C) | 6100 | 2300 | MPa | ISO 178 |
| 弯曲强度 (23°C) | 124 | 50.0 | MPa | ISO 178 |
| 泊松比 | 0.40 | -- | ISO 527 |
| 冲击性能 | 干燥 | 调节后的 | 单位制 | 测试方法 |
|---|---|---|---|---|
| 简支梁缺口冲击强度 | ISO 179/1eA | |||
| -30°C | 6.0 | 8.0 | kJ/m2 | ISO 179/1eA |
| 23°C | 7.0 | 17 | kJ/m2 | ISO 179/1eA |
| 简支梁无缺口冲击强度 | ISO 179/1eU | |||
| -30°C | 110 | 130 | kJ/m2 | ISO 179/1eU |
| 23°C | 140 kJ/m2 | 无断裂 | ISO 179/1eU | |
| 悬壁梁缺口冲击强度 | ISO 180 | |||
| -30°C | 7.0 | 7.0 | kJ/m2 | ISO 180 |
| 23°C | 9.0 | 16 | kJ/m2 | ISO 180 |
PA特性
1、具有优良的耐磨性、自润滑性，机械强度较高。但吸水性较大，因而尺寸稳定性较差
2、PA66在较高温度也能保持较强的强度和刚度。PA66在成型后仍然具有吸湿性，其程度主要取决于材料的组成、壁厚以及环境条件。
3、在产品设计时，一定要考虑吸湿性对几何稳定性的影响。为了提高PA66的机械特性，经常加入各种各样的改性剂。玻璃就是最常见的添加剂，有时为了提高抗冲击性还加入合成橡胶，如EPDM和SBR等。PA66的粘性较低，因此流动性很好（但不如PA6）。这个性质可以用来加工很薄的元件。它的粘度对温度变化很敏感。
4、PA66的收缩率在1%~2%之间，加入玻璃纤维添加剂可以将收缩率降低到0.2%~1% 。收缩率在流程方向和与流程方向相垂直方向上的相异是较大的。PA66对许多溶剂具有抗溶性，但对酸和其它一些氯化剂的抵抗力较弱。
