PA66简介:尼龙(Nylon),中文名聚酰胺,英文名称Polyide(简称PA),是分子主链上含有重复酰胺基团—[NHCO]—的热塑树脂总称。其命名由合成单体具体的碳原子数而定。是美国的化学工业公司──杜邦公司化学家卡罗瑟斯和他的科研小组发明的。 尼龙PA66;聚己二酰己二胺;英文名:Polyide 66,缩写 nylon 66。 CAS编号:32131-17-2 尼龙PA66是PA系列中机械强度、应用广的品种,因其结晶度高,故其刚、耐热都较高.
PA66工艺:干燥处理:如果加工前材料是密封的,那么就没有必要干燥。然而,如果储存容器被打开,那么建议在 85℃ 的 热空气中干燥处理。如果湿度大于 0.2%,还需要进行105℃,12 小时的真空干燥。 熔化温度:260~290℃。对玻璃添加剂的产品为275~280℃。熔化温度应避免高于 300℃。
PA66具有优良的耐磨、自润滑,机械强度较高。但吸水较大,因而尺寸稳定较差
PA66 has excellent wear resistance, self lubrication and high mechanical strength. However, the size stability is poor because of its high water absorption
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 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.
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