Method for preparing nano high-strength gypsum 3D printing material

Abstract

The invention discloses a method for preparing a nano high-strength gypsum 3D printing material; the method comprises the steps: adding water and a crystal grain length controlling agent into gypsum, mixing by a ball mill, and sending the mixture into a water steam phase change ultrafine mill, to obtain nano gypsum; or adding gypsum, water, a nucleation agent and a crystal grain length controlling agent into a reaction kettle, carrying out a hydrothermal reaction, carrying out liquid-solid separation to obtain hemihydrate gypsum, and crushing and drying the hemihydrate gypsum to obtain nano gypsum; or adding gypsum into an autoclave, adding water and a crystal grain length controlling agent, carrying out a hydrothermal reaction to obtain hemihydrate gypsum, and crushing and drying the hemihydrate gypsum to obtain nano gypsum; and adding a setting time controlling agent, a surface modifier, a mortar additive and an enhancer into the obtained nano gypsum, and mixing evenly, to obtain gypsum ink. When the gypsum ink is used, a solvent is added to the gypsum ink and mixed evenly. The product is low in cost and good in performance.

Description

technical field [0001] The invention relates to gypsum, in particular to a method for preparing a nanometer high-strength gypsum 3D printing material. Background technique [0002] The chemical essence of gypsum is calcium sulfate, commonly referred to as gypsum refers to raw gypsum, the chemical essence is calcium sulfate dihydrate (CaSO4 2H 2 O). When it is re-dried at 128°C, it will lose part of its crystal water and become β-hemihydrate gypsum, whose chemical essence is β-calcium sulfate hemihydrate (β-CaSO4 1 / 2H 2 O), if it loses part of the crystallization water when the saturated vapor pressure is on, it becomes α-hemihydrate gypsum, and its chemical essence is α-calcium sulfate hemihydrate (α-CaSO4 1 / 2H 2 O), the two hemihydrate gypsums have the same chemical formula but different structures. They continue to lose the water of crystallization to form anhydrous gypsum, the chemical essence is anhydrous calcium sulfate (CaSO 4 ). Calcium sulfate dihydrate and calc...

AI Technical Summary

Problems solved by technology

[0005] In this method, due to the low water content of the dihydrate gypsum and the addition of a grain length control agent, the residence time of the gypsum in the mill is short, and the dihydrate gypsum cannot be fully dissolved in the steam, and hemihydrate gypsum with a coarse shape is crystallized to obtain The gypsum strength is low (less than 10MPa)

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