美国杜邦PA66 101F(PA66101F高粘度)

美国杜邦pa66 101f(pa66101f高粘度)

injection molding processconditions: dry treatment: if the material is sealed beforeprocessing, then there is no need to dry. however, if the storagecontainer is opened, drying at 85 °c in hot air is recommended. ifthe humidity is greater than 0.2% , vacuum drying at 105 °c for 12hours is also re melting temperature: 260 ~ 290 °c. theproduct of glass additive is 275ー280 °c. the melting temperatureshould be avoided above 300 °c. mold temperature: recommended 80°c. mold temperature will affect the degree of crystallinity, whichwill affect the physical properties of the product. for thin-walledplastic parts, if the mold temperature is lower than 40 °c, thecrystallinity of the plastic parts will change with time. in orderto maintain the geometric stability of the plastic parts, annealingtreatment is needed. injection pressure: usually between 750 and1250 bar, depending on material and product design. injection rate:high (slightly lower for reinforced materials). runner and gate:the location of the gate is important because pa66 has a shortsetting time. gate aperture should not be less than 0.5 * t (wheret is the thickness of the plastic part) . if a hot runner is used,the gate should be smaller than a conventional runner because thehot runner helps prevent premature solidification of the material.if a submerged gate is used, the small diameter of the gate shouldbe 0.75 mm.

化学和物理特性:

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性，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。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。

典型应用范围:

同pa6相比，pa66更广泛应用于汽车工业、仪器壳体以及其它需要有抗冲击性和高强度要求的产品。