Collapsing intensifier for sodium silicate-bonded sand used for casting

Abstract

The invention relates to a collapsing intensifier for sodium silicate-bonded sand used for casting. Raw materials of the collapsing intensifier for the sodium silicate-bonded sand comprise the components including ferric oxide magnetic powder, dickite powder, xanthan gum, ceramic micro powder, fluosilicate, bentonite and a surfactant. According to the collapsing intensifier, a mixture of the ferric oxide magnetic powder, the xanthan gum and the dickite powder serves as the collapsing intensifier, since the collapsing intensifier is adopted, produced combustible gas is little, most importantly,the situation that after casting-purpose sodium silicate which mainly contains sodium silicate, potassium metasilicate and lithium silicate is poured, sand removing is difficult can be reduced greatly, the collapsibility of the sand is remarkably improved, and the strength of the molding sand is obviously improved. On the premise that the gas evolution amount of a sand core is not increased, thecollapsibility of an inorganic bonding agent mainly containing the sodium silicate is greatly improved, the retained strength of the agent is greatly reduced, and the strength of the sodium silicate-bonded sand is improved.

Description

technical field [0001] The invention relates to the technical field of foundry sand modification, in particular to a water glass sand collapsibility enhancer for foundry. Background technique [0002] Water glass is an inorganic binder widely used in casting production. The hardening methods of water glass sand include CO2 method, powder hardening method, natural hardening method, drying hardening method and liquid hardening agent hardening method. Among them, the CO2 hardening method is commonly used. Since the CO2 hardening method appeared in 1947, it has been rapidly promoted because of the convenience of sand mixing, compaction, hardening and demoulding. Its main disadvantages are that the molding sand has poor collapsibility after pouring, the old sand is difficult to regenerate by dry method, and the hardened core has poor preservation. Poor collapsibility is reflected in the high residual strength of water glass sand. After pouring, two residual strength peaks app...

AI Technical Summary

Problems solved by technology

[0003] Some other traditional collapsing agents solve the collapsibility at the expense of the strength of the sand mold, resulting in further deterioration of the performance of the sand mold

In view of the above problems, therefore, it has become a current research hotspot to develop a new type of collapsible enhancer for water glass sand to solve the problem of its poor collapsibility.

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