Preparation method of calcium sulfate whisker

A calcium sulfate whisker, calcium oxide technology, applied in chemical instruments and methods, calcium/strontium/barium sulfate, single crystal growth, etc., can solve the problems of yield not reaching 100%, very high temperature, pressure, etc. To achieve the effect of being conducive to environmental protection, uniform length and diameter, and easy to handle

Inactive Publication Date: 2009-08-05
LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Calcium sulfate whiskers synthesized by hydrothermal crystallization have the disadvantages of requiring very high temperature and pressure, and the yield cannot reach 100%.

Method used

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  • Preparation method of calcium sulfate whisker
  • Preparation method of calcium sulfate whisker

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Weigh 100g of industrial grade CaO into the reactor, add 500ml of distilled water, pretreat in ultrasonic to make large particles fully pulverized, then add 500ml of distilled water, and digest at 40-60°C. To obtain the lime emulsion, raise the temperature to 80°C, add sulfuric acid solution equimolar to calcium oxide, add self-made crystallization directing agent in the reaction process, the addition amount is 1% of the theoretical product production amount, stir for 40min, make it fully react, The reaction solution was separated by suction filtration as soon as possible while hot, and the X-ray diffraction spectrum and the electron microscope figure of the obtained product were as follows: figure 1 , figure 2 shown.

[0021] The obtained calcium sulfate whisker products need different surface modifications according to different application objects to make them blend well with other materials. Easy to play its performance.

Embodiment 2

[0023] Except that the reaction temperature is 40° C., and 2% of a self-made crystallization directing agent is added, the other conditions are the same as in Example 1.

Embodiment 3

[0025] Except that the reaction temperature is 60°C, and 3% crystallization directing agent is added, the other conditions are the same as in Example 1.

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Abstract

The present invention relates to a kind of preparation method of calcium sulphate whisker, particularly a kind of method of producing hemihydrate, anhydrous calcium sulfate fibrous single crystal, and its specific steps are as follows: (1) adopt technology such as hydrothermal synthesis (2) Pretreat industrial grade calcium oxide, put it into the reactor for digestion at 40-60°C to obtain lime emulsion; (3) raise the temperature of the obtained lime emulsion to 40-110°C in the reactor, Add an equimolar sulfuric acid solution, stir for 30-60 minutes, and add a crystallization directing agent during the reaction. Make it react fully, obtain the required calcium sulfate whisker product through filtration, washing, surface treatment and drying. The present invention is characterized in that: adding self-made crystallization directing agent, controlling different reaction temperatures, and obtaining calcium sulfate whiskers with different aspect ratios, the product has uniform length and diameter, large aspect ratio, and has no strict requirements on the purity of raw materials.

Description

technical field [0001] The invention relates to a method for preparing calcium sulfate whiskers, in particular to a method for producing hemihydrate and anhydrous calcium sulfate fibrous single crystals. Background technique [0002] Whiskers refer to fibrous single crystals with a fixed cross-sectional area, complete shape, perfect internal structure, and an aspect ratio as high as 5-1000. Due to its small diameter, the atomic arrangement is highly ordered during crystallization, which changes the defects of voids and dislocations that conventional materials have. Therefore, calcium sulfate whiskers have unique and excellent properties. It can be used as a medium-strength filler, and the reinforcing effect of fine-diameter fibers is close to that of other high-performance fiber-reinforced materials. The plastic products reinforced with it have improved tensile strength, bending strength, bending modulus of elasticity and heat distortion temperature. It can replace asbest...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B29/62C30B29/46C01F11/46
Inventor 张连红张洪林蒋林时张强于洪艳邱峰梁红玉姜虎生李长波赵国峥凤颀
Owner LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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