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PA66 的粘较低,因此流动很好(但不如 PA6)。这个质可以用来加工很薄的元件。 它的粘度对温度变化很敏感。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 has low viscosity, so it has good fluidity (but not as good as PA6). This property can be used to process very thin components. Its viscosity is sensitive to temperature changes. The shrinkage of PA66 is in the range of 1% ~ 2%, and it can be reduced to 0.2% ~ 1% by adding gss fiber additive. The difference of shrinkage rate in the process dirion and in the dirion perpendicur to the process dirion is rger.
The development of PA66: in the te 1940s, Dopont company in the United States realized the industrial production of PA66. At present, there are more than 20 kinds of nylon resins in the world aording to their structures, with more than 800 brand numbers. The product ne is determined by the number of carbon atoms in the repeating unit of nylon macromolecule. The general formu can be written as nylon or Pa. There are PA6, PA66, PA11, PA12, PA610, pa612, PA1010, PA46, PA6T, PA9T, etc. ong them, PA6 and PA66 are the main varieties, aounting for about 92% of the total ount of PA engineering pstics.
PA66 在聚酰胺材料中有较高的熔点。它是一种半晶体-晶体材料。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,其程度主要取决于材料的组成、壁厚以及环境条件。在产品设计时,一定要考虑吸湿对几何稳定的影响。
PA66 has a high melting point in polyide. It is a semi crystalline crystalline material. PA66 can also maintain strong strength and stiffness at higher temperature. PA66 still has hygroscopicity after molding, and its degree mainly depends on the comition of the material, wall thickness and environmental conditions. In product design, the influence of Hygroscopicity on geometric stability must be considered
PA66 process: drying: if the material is sealed before processing, there is no need to dry. However, if the storage container is opened, drying in hot air at 85 ℃ is recoended. If the humidity is higher than 0.2%, vacuum drying at 105 ℃ for 12 hours is required. Melting temperature: 260 ~ 290 ℃. For gss additive products, 275 ~ 280 ℃. The melting temperature should not be higher than 300 ℃.
Application fields of PA66:
1. It is widely used in machinery, instrumentation, automobile parts, elronic and elrical, railway, household appliances, counication, textile machinery, sports leisure goods, oil pipe, oil tank and some precision engineering products.
2. Elrical and elronic equipment: connor, reel, timer, cover circuit breaker, switch housing base
Automobile: radiator n, door handle, fuel tank cover, air intake grille, water tank cover, lp holder
3. Industrial parts: chair seat, bicycle fre, skate base, textile shuttle, pedal, slide conveyor
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