德国巴斯夫PA66 树脂的最大缺点是吸水率较高。为了得到更gaoji用途的PA66树脂, 通常需要对PA66树脂进行干燥而进一步脱去其表面水分。经干燥后进一步脱去水分的PA 66 树脂通常叫做PA66干切片。干燥后的PA66 树脂在包装时的物料温度通常较高, 一般可达80 ℃以上。为防止PA66干切片在包装后储存时含水率升高, 出售德国巴斯夫PA66干切片的包装都是采用气密性良好的内置铝箔的复合包装袋包装和储存。由于包装的物料温度在短时间内很难下降, 加之包装袋内含有一定的氧气, 很容易导致物料在包装袋内储存一段时间后产生表面发黄现象, 从而造成产品质量下降。因此, 了解PA66干切片在包装后储存时表面发黄的原因, 针对性地改进干燥后PA66树脂的输送工艺流程、改变物料在料仓中的存放时间、降低包装袋内的氧含量及改进PA66树脂在包装后的存放习惯, 对于稳定和控制产品质量十分必要。
The biggest drawback of BASF PA66 resin in Germany is its high water absorption. In order to obtain more advanced PA66 resin, it is usually necessary to dry the PA66 resin and further remove its surface moisture. The PA 66 resin that further removes moisture after drying is commonly referred to as PA66 dry chips. The dried PA66 resin usually has a high material temperature during packaging, typically reaching over 80 ℃. To prevent the moisture content of PA66 dry slices from increasing during storage after packaging, the packaging for selling BASF PA66 dry slices in Germany is packaged and stored in composite packaging bags with good airtightness and built-in aluminum foil. Due to the difficulty in reducing the temperature of the packaging material in a short period of time, and the presence of a certain amount of oxygen in the packaging bag, it is easy to cause surface yellowing of the material after being stored in the packaging bag for a period of time, resulting in a decrease in product quality. Therefore, it is necessary to understand the reasons for the yellowing of the surface of PA66 dry chips during storage after packaging, improve the transportation process of dried PA66 resin, change the storage time of materials in the silo, reduce the oxygen content in the packaging bag, and improve the storage habits of PA66 resin after packaging, in order to stabilize and control product quality.
