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Preparation method of alpha-calcium sulfate hemihydrate crystal whisker by one-step autocatalysis and application thereof

A calcium sulfate hemihydrate and autocatalysis technology, applied in the field of materials, can solve the problems of complex system and high cost, and achieve the effects of broad application prospect, short production cycle and complex system solution.

Inactive Publication Date: 2015-04-29
HENAN INST OF ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a one-step self-catalyzed α-calcium sulfate hemihydrate whisker for the traditional method to prepare α-calcium sulfate hemihydrate. The preparation method and application of calcium sulfate whisker, directly with CaCl 2 and Na 2 SO 4 As a raw material, the by-product in the reaction is used as a crystal modifier, and no additional crystal modifier is added, which greatly reduces the production cost, and the obtained α-calcium sulfate hemihydrate whiskers have uniform size

Method used

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  • Preparation method of alpha-calcium sulfate hemihydrate crystal whisker by one-step autocatalysis and application thereof
  • Preparation method of alpha-calcium sulfate hemihydrate crystal whisker by one-step autocatalysis and application thereof
  • Preparation method of alpha-calcium sulfate hemihydrate crystal whisker by one-step autocatalysis and application thereof

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Embodiment 1

[0021] The preparation method of the one-step autocatalytic α-calcium sulfate hemihydrate whisker of the present embodiment, the steps are as follows:

[0022] Weigh 27.5g CaCl 2 (0.25mol) dissolved in 100mL deionized water to prepare 2.5mol / L CaCl 2 solution, weighing 35.5g Na 2 SO 4 (0.25mol) was dissolved in 200mL deionized water to prepare 1.25mol / L Na 2 SO 4 solution, and then the two solutions were filtered separately.

[0023] the above Na 2 SO 4 Pour into a three-necked flask, stir mechanically, and then add CaCl at a speed of 5mL / min 2 Add to the three-necked flask, wait for the CaCl 2 After the solution was added dropwise, stirring was continued for 0.5 h. Then the temperature of the solution was raised to 104° C., the mechanical stirring speed was 1500 rpm, and the reaction was continued for 4 h while maintaining the mechanical stirring speed and the temperature of the solution. After the reaction was complete, the reaction liquid was filtered while it was...

Embodiment 2

[0026] The preparation method of the one-step autocatalytic α-calcium sulfate hemihydrate whisker of the present embodiment, the steps are as follows:

[0027] Weigh 55.0g CaCl 2 (0.5mol) dissolved in 200mL deionized water to prepare 2.5mol / L CaCl 2 solution, weighing 35.5g Na 2 SO 4 (0.25mol) was dissolved in 200mL deionized water to prepare 1.25mol / L Na 2 SO 4 solution, and then the two solutions are filtered respectively;

[0028] the above Na 2 SO 4 Pour into a three-necked flask, stir mechanically, and then pour CaCl at a speed of 10mL / min 2 Add to the three-necked flask, wait for the CaCl 2 After the solution was added dropwise, stirring was continued for 0.5 h. Then the solution was heated to 104° C., the mechanical stirring speed was 1800 rpm, and the reaction was continued for 4 h while maintaining the mechanical stirring speed and the temperature of the solution. After the reaction was complete, the reaction liquid was filtered while it was hot, and then wa...

Embodiment 3

[0030] The preparation method of the one-step autocatalytic α-calcium sulfate hemihydrate whisker of the present embodiment, the steps are as follows:

[0031] Weigh 27.5g CaCl 2 (0.25mol) dissolved in 100mL deionized water to prepare 2.5mol / L CaCl 2 solution, weighing 35.5g Na 2 SO 4 (0.25mol) was dissolved in 200mL deionized water to prepare 1.25mol / L Na 2 SO 4 solution, and then the two solutions are filtered respectively;

[0032] the above Na 2 SO 4 Pour into a three-necked flask, stir mechanically, and then add CaCl at a speed of 5mL / min 2 Add to the three-necked flask, wait for the CaCl 2 After the solution was added dropwise, stirring was continued for 0.5 h. Then the solution was heated to 104° C., the mechanical stirring speed was 800 rpm, and the reaction was continued for 8 h while maintaining the mechanical stirring speed and the temperature of the solution. After the reaction was complete, the reaction liquid was filtered while it was hot, and then wash...

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Abstract

The invention provides a preparation method of an alpha-calcium sulfate hemihydrate crystal whisker by one-step autocatalysis, belonging to the field of materials. The method comprises the following steps: reacting calcium chloride and anhydrous sodium sulfate to obtain calcium sulfate dihydrate; and by using the byproduct sodium chloride in the reaction as a catalyst (crystal transforming agent) to accelerate the next reaction, carrying out normal-temperature hydrothermal reaction under the condition of high-speed stirring under the action of sodium chloride to remove 1.5-molecule crystalline water, thereby obtaining the alpha-calcium sulfate hemihydrate crystal whisker. The alpha-calcium sulfate hemihydrate crystal whisker has uniform particle size. The reaction process is an autocatalysis process without adding any additional crystal transforming agent, thereby effectively solving the problems of complex reaction system, higher cost and difficulty in operation in the alpha-calcium sulfate hemihydrate crystal whisker production process. The method is convenient for production and application, has the characteristics of low vacuum, low energy consumption and low pollution, conforms to the material synthesis requirements by the soft processing mode, and has wide application prospects.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a preparation method and application of one-step self-catalyzed α-calcium sulfate hemihydrate whiskers. Background technique [0002] α-Calcium sulfate hemihydrate whisker is a needle-like single crystal, which is an ideal crystalline fiber with a relatively large length and diameter. When crystallized, its atoms are arranged in a highly orderly manner, and it hardly contains defects (crystals) that exist in common materials. boundaries, dislocations, holes, etc.), its mechanical strength is equal to the adjacent interatomic force, therefore, the mechanical strength and modulus of α-calcium sulfate hemihydrate whiskers are close to the theoretical values ​​of complete crystal materials, and its mechanical properties are much higher than Other chopped fibers and granular fillers. Based on these excellent properties, α-calcium sulfate hemihydrate whiskers are often u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/62C30B29/46C30B7/14
CPCC30B29/62C30B7/14C30B29/46
Inventor 于翔王延伟迟长龙田银彩杨柳魏媛辛长征李思雨
Owner HENAN INST OF ENG
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