Powder injection molding, binder special for powder microinjection molding, and preparation method for binder

• Main Authors: YI SHANJIE, LUO HAO, LIU LIN, NI XINLEI, YIN HAIQING, QU XUANHUI
• Format: Patent
• Language: Chinese; English
• Published: 10.10.2012
• Subjects: ARTIFICIAL STONE; CEMENTS; CERAMICS; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS; CONCRETE; LIME, MAGNESIA; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; REFRACTORIES; SLAG; THEIR PREPARATION OR CHEMICAL WORKING-UP; TREATMENT OF NATURAL STONE; USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS

The invention discloses powder injection molding, binder special for powder microinjection molding, and a preparation method for the binder. The binder comprises the following components in percentage by weight: 10 to 40 percent of polyethylene glycol (PEG), 10 to 40 percent of ethylene vinyl acetate (EVA), 20 to 40 percent of polyvinyl butyral (PVB), and 5 to 20 percent of stearic acid (SA). The preparation method is characterized by comprising the following steps of: completely melting PEG with a low melting point in a thermostat at the appropriate temperature which is lower than the melting point of polymer, adding the weighed EVA and SA and stirring continuously, adding PVB in batches, strongly stirring to obtain uniform milk, and after the milk is cooled, taking out. The binder has the advantages that the binder and feed are excellent in flowability; the PVB and the EVA in the selected binder are used as framework polymer in a water soluble binder system, so that the effect of enhancing the feed is achie