Curing agent of phosphate bonding agent self-hardening sand and preparation and using methods of curing agent of phosphate bonding agent self-hardening sand

Abstract

The invention provides a curing agent of phosphate bonding agent self-hardening sand. The curing agent of the phosphate bonding agent self-hardening sand can be applied to modeling and core making. Phosphate is a phosphate bonding agent which takes aluminium dihydrogen phosphate as a main ingredient. The curing agent comprises two components including a component I and a component II, wherein the component I is phenylamine; the component II consists of urea, water, ammonium chloride, silane and tetraethylenepentamine; and the hardening speed of a sand sample is adjusted by adjusting the addition of the two components. A using method of the curing agent comprises the following specific process steps: mixing the curing agent and crude sand at first; then adding the phosphate bonding agent and mixing uniformly to discharge sand; and pouring the mixture into a mold, compacting and preparing the sample, wherein the sand sample can be self-hardened at room temperature. The tensile strength of the prepared sand sample is greater than or equal to 1.0 MPa after 24 hours, and moreover, the sand sample is good in anti-moisture-absorption performance and collapsibility. The curing agent is simple in preparation process and stable in chemical property, and has good application prospect. The self-hardening process involved in the invention facilitates solving the technical problem of poor anti-moisture-absorption performance of the traditional hot and hard phosphate sand core and the technical problems of difficulty in quantifying in the self-hardening process and easiness in generation of dust during sand mixing.

Description

technical field [0001] The invention relates to the field of molding (core-making) materials in the foundry industry, in particular to a liquid solidifying agent for phosphate self-hardening sand used in foundry and a preparation and use method thereof. Background technique [0002] Phosphate binder sand for foundry has the advantages of high high temperature strength, small high temperature deformation, low gas generation, good collapsibility, etc. It is a valuable molding and core making material. Phosphate binder can be hardened by heating, and the sand core produced has high initial strength and is easy to absorb moisture. The strength drops seriously under high ambient humidity, which affects its use in foundry production; while no-bake sand technology, mold 1. The core does not need to be baked, and can be hardened and formed at room temperature, which not only saves energy, but also helps to improve labor production efficiency and reduce production costs. At present,...

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Problems solved by technology

[0003] The present invention provides a curing agent for phosphate binder self-setting sand and its preparation method and use method, and its purpose is to develop a liquid curing agent To replace powdery alkaline oxide and alkaline hydroxide, improve the dust pollution caused by powdery curing agent; solve the technical problem of poor moisture absorption resistance existing in the heating and hardening process of phosphate binder sand