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A kind of preparation method of calcium carbonate whisker

A technology of calcium carbonate whisker and crystal form control agent, applied in chemical instruments and methods, single crystal growth, single crystal growth and other directions, can solve the problems of difficult crystal form control, easy transformation of aragonite calcium carbonate, etc., to achieve solubility The effect of reducing, favoring growth, and increasing the rate of diffusion

Active Publication Date: 2022-07-22
都安春旭新材料科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Calcite-type calcium carbonate exists in square or spindle-shaped particles, while aragonite-type calcium carbonate whiskers exist in needle shape, and has the characteristics of good uniformity, high complete single crystal rate, and high whisker content. It is more suitable for use in papermaking, Plastics, rubber and other fields, but the existing production of aragonite calcium carbonate whiskers has problems such as difficult crystal form control and easy conversion of aragonite calcium carbonate to calcite calcium carbonate during the production process.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A preparation method of calcium carbonate whisker, it comprises the following steps:

[0022] (1) Dissolving silk fibroin and gum arabic in deionized water and fully stirring to obtain a crystal form control agent for later use, the mass ratio of silk fibroin and gum arabic is 2:1; the stirring time is 16h, and the stirring speed is is 100r / min;

[0023] (2) Stir and mix high-purity nano-calcium oxide and deionized water in a mass ratio of 1:3 to obtain slurry A, pass slurry A through a 100-mesh sieve, filter and remove slag, and then add 13 times the slurry to the slurry Slurry B is obtained by diluting the deionized water of the quality of material A to obtain slurry B, then adding the crystal form control agent obtained in step (1) to the slurry B, heating to 50 ° C and stirring at a constant temperature for 1 h to obtain slurry C; the crystal form control agent The mass ratio of the added amount of the agent to the slurry A is 1:100; the purity of the high-purity n...

Embodiment 2

[0027] A preparation method of calcium carbonate whisker, it comprises the following steps:

[0028] (1) Dissolving silk fibroin and gum arabic in deionized water and fully stirring to obtain a crystal form control agent for later use, the mass ratio of silk fibroin and gum arabic is 1:1; the stirring time is 18h, and the stirring speed is is 100r / min;

[0029] (2) Stir and mix high-purity nano-calcium oxide and deionized water in a mass ratio of 1:5 to obtain slurry A, pass slurry A through a 100-mesh sieve, filter and remove slag, and then add 14 times the slurry to the slurry The deionized water of the quality of feed A is diluted to obtain slurry B, and then the crystal form control agent obtained in step (1) is added to the slurry B, heated to 55 ° C, and stirred at a constant temperature for 2 hours to obtain slurry C; the crystal form control agent The mass ratio of the additive amount of the agent to the slurry A is 2:100; the purity of the high-purity nano-calcium ox...

Embodiment 3

[0033] A preparation method of calcium carbonate whisker, it comprises the following steps:

[0034] (1) Dissolve silk fibroin and gum arabic in deionized water and fully stir to obtain a crystal form control agent for later use. The mass ratio of silk fibroin and gum arabic is 2:3; the stirring time is 12h, and the stirring speed is is 150r / min;

[0035] (2) Stir and mix high-purity nano-calcium oxide and deionized water in a mass ratio of 1:4 to obtain slurry A, pass slurry A through a 100-mesh sieve, filter and remove slag, and then add 14 times the slurry to the slurry The deionized water of the quality of feed A is diluted to obtain slurry B, and then the crystal form control agent obtained in step (1) is added to the slurry B, heated to 52 °C, and stirred at a constant temperature for 1 h to obtain slurry C; the crystal form control agent The mass ratio of the additive amount of the agent to the slurry A is 3:100; the purity of the high-purity nano-calcium oxide is more...

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Abstract

The invention discloses a preparation method of calcium carbonate whiskers. The method comprises first dissolving silk fibroin and gum arabic in deionized water and fully stirring to obtain a crystal form control agent, and then stirring and mixing high-purity nanometer calcium oxide and deionized water to obtain a crystal form control agent. Slurry A, pass the slurry A through a 100-mesh sieve and then filter to remove the slag, then add deionized water to the slurry to dilute to obtain slurry B, then add the crystal form control agent to the slurry B, and heat it to 50~60℃ Stirring at a constant temperature for 1-2 hours to obtain slurry C, then adding ammonia water to the slurry C to adjust the pH value, then putting it into a supergravity carbonization reactor for carbonization reaction, centrifuging the slurry obtained after carbonization to obtain a precipitate, and drying the precipitate After crushing, calcium carbonate whiskers are obtained. The invention solves the problem of difficult crystal control in the production of aragonite-type calcium carbonate whiskers and easy conversion of aragonite-type calcium carbonate into calcite-type calcium carbonate, and obtains acicular calcium carbonate whiskers with high activity.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial preparation, and in particular relates to a preparation method of calcium carbonate whiskers. Background technique [0002] Calcium carbonate whisker is another new type of inorganic filler material after nano-calcium carbonate. It is a white fluffy solid, and its crystalline form is single crystal. There are almost no defects inside the crystal. It has excellent properties such as high weight, high wear resistance and heat resistance, good thermal recession and thermal recovery performance, and good compatibility with matrix resin when compounding with plastics, which can improve the processing performance of products and improve mechanical properties, so it is widely used. It is used in the manufacture of automobiles, plastics, electrical components, and high-quality structural components. [0003] There are three types of calcium carbonate whiskers: calcite, aragonite and spherical nephel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B29/10C30B29/62C30B7/14
CPCC30B29/10C30B29/62C30B7/14
Inventor 韦明
Owner 都安春旭新材料科技有限责任公司
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