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Method for hydrothermal technology synthesis of calcium sulfate hemihydrates powder particles

A technology of calcium sulfate hemihydrate and hydrothermal method, which is applied in the field of material science, can solve the problems of inability to obtain gypsum hemihydrate gypsum raw materials, complex crystal transformation process, and difficult particle size control, so as to achieve fluidity and dispersion Excellent, reproducible, time-consuming results

Inactive Publication Date: 2016-09-21
宁波道乐新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But first of all, natural gypsum mines have different veins, different conditions, more impurities, and the process of crystallization is complicated and difficult to control, so it is impossible to obtain gypsum hemihydrate gypsum raw materials with ideal sphericity
Secondly, the generated plaster is usually in the form of lumps and needs to be pulverized by grinding. It is difficult to control the particle size in this process

Method used

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  • Method for hydrothermal technology synthesis of calcium sulfate hemihydrates powder particles
  • Method for hydrothermal technology synthesis of calcium sulfate hemihydrates powder particles
  • Method for hydrothermal technology synthesis of calcium sulfate hemihydrates powder particles

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Embodiment 1

[0024] The method for synthesizing calcium sulfate hemihydrate powder particles by hydrothermal method in the embodiment of the present invention is as follows: (1) Weigh 2 mol of calcium chloride and 2 mol of sodium sulfate, add them to 500 ml of deionized water, and ultrasonically disperse 30min, ultrasonic power 400W; (2) Weigh 2mol polyvinyl alcohol, add it into 100ml deionized water, ultrasonically disperse for 10min, ultrasonic power 400W; (3) Weigh 2mol polyvinylpyrrolidone, add it into 100ml deionized water In water, ultrasonically disperse for 10 minutes, and the ultrasonic power is 400W; (4) Add the solution obtained in steps (2) and (3) dropwise to the solution obtained in step (1), and continue to stir and mix for 30 minutes; (5) Add the solution obtained in step (4) ) The mixed solution obtained was transferred to a hydrothermal reaction kettle, and hydrothermally reacted at 180°C for 12 hours; (6) The reaction product obtained in step (5) was centrifuged at 4000rp...

Embodiment 2

[0027] The method for synthesizing calcium sulfate hemihydrate powder particles by hydrothermal method in the embodiment of the present invention, the specific steps are as follows: (1) Weigh 1 mol of calcium chloride and 1 mol of sodium sulfate, add them to 300ml of deionized water, and ultrasonically disperse 20min, ultrasonic power 200W; (2) Weigh 1mol polyvinyl alcohol, add it into 50ml deionized water, ultrasonically disperse for 10min, ultrasonic power 200W; (3) Weigh 1mol polyvinylpyrrolidone, add it into 50ml deionized water In water, ultrasonically disperse for 10 minutes, and the ultrasonic power is 200W; (4) Add the solution obtained in steps (2) and (3) dropwise to the solution obtained in step (1), and continue to stir and mix for 20 minutes; (5) Add the solution obtained in step (4) ) The mixed solution obtained was transferred to a hydrothermal reaction kettle, and hydrothermally reacted at 160°C for 6 hours; (6) The reaction product obtained in step (5) was cent...

Embodiment 3

[0030] The method for synthesizing calcium sulfate hemihydrate powder particles by hydrothermal method in the embodiment of the present invention, the specific steps are as follows: (1) Weigh 1 mmol of calcium chloride and 1 mmol of sodium sulfate, add them to 5 ml of deionized water, and ultrasonically disperse 10min, ultrasonic power 100W; (2) Weigh 1mmol polyvinyl alcohol, add it into 5ml deionized water, ultrasonically disperse for 10min, ultrasonic power 100W; (3) Weigh 1mmol polyvinylpyrrolidone, add it into 5ml deionized water In water, ultrasonically disperse for 10 minutes, and the ultrasonic power is 100W; (4) Add the solution obtained in steps (2) and (3) dropwise to the solution obtained in step (1), and continue to mix mechanically for 5 minutes; (5) Add the solution obtained in step (4) ) The mixed solution obtained was transferred to a hydrothermal reaction kettle, and hydrothermally reacted at 160°C for 6 hours; (6) The reaction product obtained in step (5) was ...

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Abstract

The invention provides a method for hydrothermal technology synthesis of calcium sulfate hemihydrates powder particles. The method concretely comprises the following steps: mixing a calcium chloride and sodium sulfate mixed solution with polyvinyl alcohol and polyvinylpyrrolidone, carrying out a hydrothermal reaction, and carrying out supercritical drying on the above obtained reaction product to obtain final powder. The method utilizes a polyvinyl alcohol and polyvinylpyrrolidone composite surfactant to modify, so the particle size and the surface morphology of the hydrothermal synthesized powder can be effectively regulated; and a supercritical drying technology finally adopted in the invention simultaneously guarantees the fluidity and the dispersibility of the powder. The method has the advantages of green and mild reaction conditions, simplicity in operation, short time and strong repeatability. The calcium sulfate hemihydrates powder particles prepared through the method have the advantages of uniform dimensions, high degree of sphericity, controllable particle size, excellent fluidity and dispersibility, and wide application prospect in 3D printing gypsum powder materials.

Description

technical field [0001] The invention relates to a method for synthesizing calcium sulfate hemihydrate powder particles by a hydrothermal method, which belongs to the field of material science. Background technique [0002] 3D printing, also known as additive manufacturing, is a type of rapid prototyping technology and is known as the core technology of the "third industrial revolution". Materials are the material basis of 3D printing and are currently the bottleneck restricting the development of 3D printing. Among them, the 3DP technology based on gypsum-based powder has the characteristics of fast printing speed, high efficiency, simple composition, and full color. At the same time, its advantages of simple equipment and low printing cost stand out among various printing methods and become the most widely used printing method. Industrial-grade 3D printing technology. The gypsum-based powder used in 3DP technology usually refers to a mixture of calcium sulfate hemihydrate ...

Claims

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Application Information

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IPC IPC(8): C01F11/46
CPCC01F11/46C01P2004/02
Inventor 陈炳地夏庆锋郑庆刚陈国涛
Owner 宁波道乐新材料科技有限公司
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