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.
