Cold core box ceramsite sand and preparation method thereof

Abstract

The invention discloses cold core box ceramsite sand and a preparation method of the cold core bo ceramsite sand. The cold core box ceramsite sand is prepared from ceramsite sand, ferroferric oxide, zeolite powder and organic resin. The organic resin is prepared from phenolic resin and polyisocyanate. The cold core box ceramsite sand has the beneficial effects that the cold core box ceramsite sandis prepared from the ceramsite sand, the surface of the ceramsite sand is wrapped by a layer of aluminum powder in the preparation process, an aluminum oxide film will be generated on the surface ofthe ceramsite sand after the wrapping aluminum powder is sintered, and the film not only keeps the roundness and fluidity of the ceramsite sand, but also improves the fire resistance of the ceramsite.When the cold core box ceramsite sand is prepared, the film further can reduce the roughness of the surface of the ceramsite sand, therefore, the resin wrapping performance is improved, and the binding bridge strength is increased. The cold core box ceramsite sand has the low thermal expansion property, the quite high fire resistance degree and excellent resistance to metal penetration and sand adhesion, and a produced casting is smooth, free of sand adhesion defect and good in size precision.

Description

Technical field [0001] The invention relates to the technical field of casting materials, in particular to a cold core box ceramsite sand and a preparation method thereof. Background technique [0002] Cold core box sand is a material used to manufacture cores in foundry production. It has good fluidity and filling properties and has a wide range of applications. Cold box sand is usually composed of refractory materials and binders, and the refractory materials at this stage are mainly quartz sand, non-quartz sand, artificial sand, etc. Among them, quartz sand is mainly silica sand; non-quartz sand is divided into magnesia, olivine sand, chromite sand, zircon sand, etc.; artificial sand is mainly made of pearl sand. [0003] However, with the rapid development of the foundry industry, people have higher and higher requirements for foundry materials, and some shortcomings of traditional cold box sand foundry sand have become more and more prominent. Quartz silica sand has the shor...

AI Technical Summary

Problems solved by technology

[0003] However, with the rapid development of the foundry industry, people have higher and higher requirements for casting materials, and some shortcomings of traditional cold box sand casting sand have become more and more prominent

Quartz silica sand has the disadvantages of low refractoriness, large thermal expansion, large angle coefficient, and poor fluidity, causing defects such as sand sticking, veining, deformation, and cracking in castings

Non-quartz sand (magnesia, olivine sand, chromite sand, zircon sand) has high comprehensive performance, but resources are scarce and expensive

At the same time, because it is broken by machinery in the production process, a large angle coefficient will consume a large amount of binder

Although artificial pearl sand is superior in performance, due to environmental protection issues, it still has difficulties in obtaining raw materials, complicated preparation process, high energy consumption, high production cost, and iron substances contained in pearl sand are easy to react with castings, etc. question

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