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Introduction to Wax Base Binder in Powder Injection Molding

Categories: ZCMIM NewsStars: 3StarsVisit: -Release time: 2019-08-15 11:18:00
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According to its main composition and properties, the binder used in powder injection molding is generally divided into: wax base binder, oil base binder, oil waxy binder, aldehyde base binder, water-soluble binder, gel base binder, acrylic base binder, thermosetting binder, thermoplastic - thermosetting binder, etc

Wax base binder is one of the earliest, most mature and widely used. Waxes widely used today include common paraffin, bee wax, carnauba wax, microcrystalline wax, polyethylene glycol wax and polyolefin wax. This kind of wax has low melting point, good wettability, short molecular chain, low viscosity, and smaller volume change than other polymers when decomposed. Wax is relatively small molecular weight, volatile, so it is good for debinding. But when a wax is used alone as a binder, it requires heating slowly or siphoning because of its own narrow melting temperature range, which makes debinding difficult. There are also problems of uneven filling and green part surface movement during debinding. Thus, waxes are typically mixed with other polymers such as polypropylene (pp), polyethylene (PE), vinyl vinyl acetate copolymer (EVA), and additives to produce required multicomponent structural binder for powder injection molding.

The advantages of wax base binder are low melting point, low viscosity and viscosity decreases rapidly with the increase of shear rate. With high pressing strength, wide injection temperature range and good fluidity, it can be used to fill concave and convex corners of various complex mold cavities. With low cost and high loading capacity, it is suitable for products with thickness less than 8mm and parts with low surface roughness. The disadvantages of wax base binder are low melting point, low thermal deformation temperature, poor conformation, easy to collapse; low viscosity, cannot mix well with metal powder, easy to produce two-phase separation and easy to generate spray and welding lines in injection molding; And as the wax cools, it shrinks in volume 11%-20%.  

Keywords in the article: wax base binder powder injection molding
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