Retardant preparation method

A retarder and raw material technology, applied in the field of retarder preparation, can solve the problems of short initial setting time of slurry, poor water resistance of products, unfavorable slurry forming operation, etc.

Inactive Publication Date: 2013-02-13
杨益
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Even so, due to the short initial setting time of the slurry of this material and the poor water resistance of the product, it is not conducive to the molding operation of the slurry in the

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0007] A kind of preparation method of retarder, is according to the percentage by weight in weight: water 30%, aluminum hydroxide 25%, tartaric acid 15%, phosphoric acid 30%, above-mentioned each raw material is added in the reactor under normal temperature condition Stir for 4 5 minutes.

Embodiment 2

[0009] A preparation method of the retarder comprises the following percentages by weight: 25% of water, 30% of aluminum hydroxide, 20% of tartaric acid and 25% of phosphoric acid. Add the above raw materials into the reaction kettle and stir for 30 minutes at normal temperature.

Embodiment 3

[0011] A preparation method of the retarder comprises the following percentages by weight: 35% of water, 20% of aluminum hydroxide, 10% of tartaric acid and 35% of phosphoric acid. Add the above raw materials into the reaction kettle and stir for 60 minutes at normal temperature.

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PUM

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Abstract

The invention discloses a retardant preparation method. The method is characterized in that by weight percent in the total weight, 25-85 percent of water, 20-30 percent of aluminium hydroxide, 10-20 percent of tartaric acid and 25-35 percent of phosphate are adopted as raw materials. According to the method, after being added in magnesite slurry, the retardant is reacted with Mg<2+> of the slurry to generate sparingly soluble salts which are coated on the surface and can prohibit the Mg2 from being in contact with water molecules, thereby playing a role of delaying coagulation; the more the retardant is added, the larger the cover degree is and the more obvious the coagulation delaying effect is. Besides, water molecules can permeate the MgO coated by the retardant through diffusion, so as to generate an osmotic pressure; and when the pressure reaches a certain extent, the cover layer is broken, the MgO is further hydrated, and the hydration and rigidification speed is slower.

Description

technical field [0001] The invention relates to a magnesite cementitious material modifier, in particular to a preparation method of a retarder. Background technique [0002] Magnesite cement, also known as magnesite cement, is a kind of air-hardening cement. When using this material to manufacture products, it has the characteristics of no need for moisture curing, fast strength growth, high flexural and compressive strength, weak alkali Non-toxic, low corrosion, high elasticity, good toughness, light weight, good cementation to organic and inorganic materials or fibers, etc., widely used in construction, decoration, urban construction, agriculture and other fields. Even so, due to the short initial setting time of the slurry of this material and the poor water resistance of the product, it is not conducive to the molding operation of the slurry in the process of manufacturing the finished product, and it is difficult to ensure the appearance quality of the product. This is...

Claims

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Application Information

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IPC IPC(8): C04B24/04C04B22/16C04B103/22
Inventor 杨益
Owner 杨益
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