| 摘要 |
PURPOSE: A coupler system based on water glass is provided to suitably apply the system on a core molding apparatus to improve performance of the coupler additive for sands in the molding apparatus, especially, increase flowing ability of the molding sands. CONSTITUTION: The coupler system comprises water glass consisting of aqueous alkaline silicate solution represented by xSiO2 x yM2O x zH2O (wherein M means alkaline ions such as Li+, K+ or Na+). The system further contains absorbent basic materials such as sodium alkaline solution in a ratio of 1:4 to 1:6 based on the system. The system may include 20-40wt.% of solid materials such as Na2O/SiO2 in a ratio of 2.5 to 3.5. The couplyer system is useful for the molding apparatus comprising a suction valve(1), a chamber(10), a storage tank(5), a slide(4), a sand cylinder(6), a molding head(7), a core box(8), a sand fan(9) and core sands(11).
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