2016年7月21日星期四

How is the binder classified?


A practical binder is generally composed of several components, each group has its own unique function, according to the function can be divided into main binder, secondary binder and additives. According to the principal components and properties of the binder system, the binder system can be divided into thermoplastic binder, thermosetting binder, gel system, water soluble binder and special system.

Among them, thermoplastic binder is the most widely used, and is divided into paraffin based binder, oil based binder, polymer based binder, etc..

Thermoplastic adhesives are generally made of high molecular polymer, low molecular weight substances, and the necessary additives (such as paraffin base binder, oil based binder, etc.). The functions of each component are as follows:

Polymer: high viscosity, high strength, in the process of injection and skim to maintain the shape of the billet
Low molecular weight material: low viscosity, good fluidity, can be removed at lower temperature in the process of low temperature, leaving a gap in the blank, which is conducive to the late fast hot melt

Additive: to improve the stress, reduce the viscosity, increase the wettability or lubrication.

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