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

Jiang, Xingquan; Li, Duxin; Lu, Renwei; Yang, Zhongchen; Li, Yong

doi:10.1088/2053-1591/ab79d0

Cited by 7 publications

(4 citation statements)

References 18 publications

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“…At present, the interaction of the binder and powder is mainly assessed by rheological and thermogravimetry measurements [3,[15][16][17]. Very little is known about the specific interactions among binder components and how such interaction affects the MIM of reactive powders, such as Ti-MIM.…”

Section: Introductionmentioning

confidence: 99%

Interactions of polymeric components in a POM-based binder system for titanium metal injection moulding feedstocks

et al. 2023

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Owing to the different characteristics of each of the multiple polymers, obtaining a homogenous metal injection moulding (MIM) feedstock blend is challenging. Therefore, studying interactions between the polymeric components is vital for achieving suitable MIM feedstocks. We report on the effects of different compatibilisers -EGMA and E40on the interactions in polyoxymethylene (POM) and polypropylene (PP) blends. We measured contact angles and performed Fourier transform infrared spectroscopy and atomic force microscopy analyses to identify the suitable compatibiliser that yields a feedstock with excellent properties. It was found that the binder system based on EGMA-3 demonstrates the lowest contact angle and best miscibility for the POM/PP blends compared to E40. This enhanced interaction lies in the chemistry of EGMA, having an active site that reduces the interfacial tension between the components of the POM/PP blend. Subsequently, this creates a positive interaction between the polymers and metal powders, ensuring good adhesion within the feedstock.

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Section: Introductionmentioning

confidence: 99%

Interactions of polymeric components in a POM-based binder system for titanium metal injection moulding feedstocks

et al. 2023

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“…Shi et al [26] found that the covalent grafting of hydroxylterminated hyperbranched polymer (HTHBP) on the carbon fiber (CF) surface can significantly enhance the interfacial properties of composites. Jiang et al [27] used a high molecular weight, highly active terminal hydroxyl hyperbranched polymer based on an aromatic polyamide hyperbranched polymer (HPN202) as a modifier of POM-based binder and investigated the catalytic debinding process and properties of feedstock in MIM. They found that the flowability of feedstock, mechanical strength of the green parts and dimensional accuracy of sintered parts were all well improved.…”

Section: Introductionmentioning

confidence: 99%

Effect of interaction from the reaction of carboxyl/epoxy hyperbranched polyesters on properties of feedstocks for metal injection molding

Chen

Zhou

et al. 2022

Mater. Res. Express

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The purpose of this study is to improve the properties of the feedstocks and shape retention of debinded parts by the reaction between 17-4PH stainless steel powders. Carboxyl-terminated hyperbranched polyester (CTHP) and epoxy-terminated hyperbranched polyester (ETHP) were used to treat the powders, and termed as CTHP-m and ETHP-m with carboxyl and epoxy group, respectively. Comparing with pristine, CTHP-m and ETHP-m, feedstock prepared from equal amount of CTHP-m and ETHP-m (CTHP-m/ETHP-m) possessed more excellent properties. The experimental results showed that the critical solids loading, flexural modulus, density and melt flow index of CTHP-m/ETHP-m feedstock were 63.8 vol.%, 2800 Mpa, 5.06 g/cm3 and 62 g/10min, respectively, which were obviously higher than that of others. Also, the shape retention of CTHP-m/ETHP-m debinded parts was the best of all the samples. The improved properties of CTHP-m/ETHP-m feedstock were attributed to the powder interaction between CTHP-m and ETHP-m formed by the chemical reaction between epoxy and carboxyl group.

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“…By mixing metal powders with binders (thermoplastic polymers), it allows the powder-binder mixture to form a paste (called a feedstock) that can provide the necessary flow at high temperature and becomes solid at room temperature. The binder eases the feedstock flow during injection moulding and retains the shape of the part until the initial stage of sintering [3][4][5][6][7]. Hence, the binder used in the feedstock is the core of metal injection moulding.…”

Section: Introductionmentioning

confidence: 99%

“…The emergence of the polyoxymethylene (POM) binder system is one of the hot topics in the powder injection moulding industry for metals and ceramics [4,8]. Owing to its excellent properties, such as high dimensional stability, high rigidity, good warm strength, and fast debinding time, POM is one of the preferred binders for MIM feedstocks [3,9,10].…”

Section: Introductionmentioning

confidence: 99%

On amine treated polyoxymethylene (POM) blends with low formaldehyde emission for metal injection moulding (MIM)

et al. 2022

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When polyoxymethylene (POM)—a common polymer used in metal injection moulding feedstock—is exposed to heat and oxygen during compounding, it can be easily decomposed, releasing undesired gaseous formaldehyde products. In order to reduce the formaldehyde emission from POM, amine treatment was performed. The effectiveness of propylamine at different concentrations and its role as a formaldehyde scavenger was studied via the UV–vis Spectrophotometry, Fourier Transform Infra-red, Thermogravimetric Analysis, Scanning Electron Microscopy, and melt flow index. The results proved that a simple amine, such as propylamine, is a promising candidate for scavenging formaldehyde in POM. It is also demonstrated that the best concentration of propylamine is 2 wt.% (POM-PA2) with a minimum formaldehyde emission of 1.44 mg/L. Further, when used in formulating metal injection moulding feedstock (MIM), the POM-PA2 reveals good rheological properties and high green strength. These advantages make the modified polyoxymethylene (POM-PA2) a promising binder system for MIM feedstock.

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

Cited by 7 publications

References 18 publications

Interactions of polymeric components in a POM-based binder system for titanium metal injection moulding feedstocks

Interactions of polymeric components in a POM-based binder system for titanium metal injection moulding feedstocks

Effect of interaction from the reaction of carboxyl/epoxy hyperbranched polyesters on properties of feedstocks for metal injection molding

On amine treated polyoxymethylene (POM) blends with low formaldehyde emission for metal injection moulding (MIM)

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