Study of hyperbranched polymer on POM-based binder in metal injection molding

Metal injection molding POM-based binder and related catalytic debinding technology have been widely applied in the MIM industry. However, the POM-based binder has a high viscosity and poor flow performance. The products are prone to produce wrinkles and cracks, which restrict their application in many materials and fields. Therefore, improving and developing POM based binder system has become the research focus of the system. In this research, hyperbranched polymer was used as a modifier of POM-based binder, and the fluidity, uniformity and thermal properties of the feedstock were analyzed. Meanwhile, the influence of the content of hyperbranched polymer on the green part, brown part and the sintered part was also studied. The results indicated that the fluidity and uniformity of the feedstock are both improved as the content of hyperbranched polymer increases and the hyperbranched polymer can improve the flexural strength and impact strength of the green part. Furthermore, the addition of the hyperbranched polymer can improve the tensile strength and dimensional accuracy of the sintered part.