Phosphate binder modified by hydroxyethylidene diphosphonic acid and preparation method thereof

Abstract

The invention provides a phosphate binding agent modified by 1-hydroxyethylidene-1,1-diphosphonic acid and a preparing method of the phosphate binding agent. The phosphate binding agent modified by 1-hydroxyethylidene-1,1-diphosphonic acid is mainly prepared from, by mass percentage, 51.59-52.45% of industrial phosphoric acid, 11.83-12.03% of aluminum hydroxide powder, 0.61-0.62% of silicic acid,1.83-1.86% of boric acid, 1.22-1.24% of light magnesium oxide, 0.76-2.4% of 1-hydroxyethylidene-1,1-diphosphonic acid and 30.53-31.04% of water. According to the phosphate binding agent modified by 1-hydroxyethylidene-1,1-diphosphonic acid, 1-hydroxyethylidene-1,1-diphosphonic acid is adopted as a modifier, and even under the condition of a small addition amount, the viscosity of the binding agentcan be significantly lowered, the strength of a prepared sand sample can be significantly improved, added raw materials participate in the reaction to the greatest extent, few residues are generated,water loss is reduced to guarantee that the binding agent has low viscosity, and the fluidity of foundry sand is improved.

Description

technical field [0001] The invention belongs to the field of foundry industry, and in particular relates to a phosphate binder modified by hydroxyethylidene diphosphonic acid and a preparation method thereof. Background technique [0002] Phosphate binder, as a green and environmentally friendly inorganic casting binder, has the characteristics of good collapsibility, colorless, and no irritating odor, and can significantly reduce environmental pollution, but compared with traditional organic resin adhesives The binder has the disadvantages of unstable performance, poor moisture absorption resistance, high viscosity, and poor fluidity of molding sand. Aiming at the related characteristics of phosphate binder, modifying it, such as the addition of some simple small molecular weight acid modifiers, can improve the performance of phosphate binder to a certain extent, but it will affect the strength of sand samples. And the improvement of mobility is not obvious. In order to a...

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Problems solved by technology

[0002] Phosphate binder, as a green and environmentally friendly inorganic casting binder, has the characteristics of good collapsibility, colorless, and no irritating odor, and can significantly reduce environmental pollution, but compared with traditional organic resin adhesives The binder has the disadvantages of unstable performance, poor moisture absorption resistance, high viscosity, and poor fluidity of molding sand.

Aiming at the related characteristics of phosphate binder, modifying it, such as the addition of some simple small molecular weight acid modifiers, can improve the performance of phosphate binder to a certain extent, but the sand sample strength and the improvement of liquidity is not obvious

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