1.重庆科聚孚工程塑料有限责任公司，重庆 401332； 2.中煤科工集团重庆研究院有限公司，重庆 400039
Development of PA6 Materials with Low Water Absorption
1．Chongqing Copolyforce Engineering Plastics Co. Ltd., Chongqing 401332, China; 2. Chongqing Research Institute Co. Ltd., of China Coal Technology & Engineering Group Corporation, Chongqing 400039, China
Abstract：Low water absorption polyamide (PA)6 was prepared by melt blending in twin-screw extruder. The effects of toughening agent, low hygroscopicity additives and compound using on water absorption and mechanical properties of PA6 materials were studied. The results show that, POE-g-MAH toughening agent can reduce the water absorption of PA6 to a certain extent, but it has the disadvantages of large amount of addition and reducing the rigidity of PA6 material. The water absorption of adding 10% toughening agent of PA6 material decreasess by 16%. Low hygroscopicity additive can obviously reduce the water absorption of PA6 material, the higher the amount of additives, the lower the water absorption, but lead to the mechanical property of PA6 material decrease. When 3% low hygroscopicity additive is added, the water absorption, tensile strength and notch impact strength of PA6 decrease by 22%, 11.2% and 35.4% respectively. The water absorption of PA6 material is reduced by the combination of toughening agent and low hygroscopicity additives, which has the advantages of fewer amounts of additives and little effect on mechanical properties. The addition of 2% toughening agent and 2% low hygroscopicity additive, the water absorption of PA6 materials decreases 31%, the tensile strength decreases slightly, and the impact strength increases slightly.
Keywords：polyamide 6; water absorption; low hygroscopicity additive; toughening agent
Zhou Lei. Development of PA6 materials with low water absorption[J]. Engineering Plastics Application，2019，47(9)：41-45.