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Preparation method of calcium carbonate whiskers

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 easy transformation of aragonite calcium carbonate and difficult crystal form control, and achieve enhanced The effect of morphology control, preventing excessive crystallization speed and reducing solubility

Active Publication Date: 2020-11-13
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 for calcium carbonate whiskers, comprising the following steps:

[0022] (1) Dissolve silk fibroin and gum arabic in deionized water and stir fully 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 16 hours, and the stirring speed is 100r / min;

[0023] (2) Stir and mix high-purity nano-calcium oxide and deionized water according to the mass ratio of 1:3 to obtain slurry A, pass slurry A through a 100-mesh sieve and filter to remove slag, and then add 13 times of slurry to the slurry Dilute the quality of material A with deionized water to obtain slurry B, then add the crystal form control agent obtained in step (1) to slurry B, heat to 50°C and stir at constant temperature for 1 hour to obtain slurry C; the crystal form control agent The mass ratio of the amount of agent added to the slurry A is 1:100; the purity of the high-purity nano calcium oxide is above 99.5%, and ...

Embodiment 2

[0027] A preparation method for calcium carbonate whiskers, comprising the following steps:

[0028] (1) Dissolve silk fibroin and gum arabic in deionized water and stir fully 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 18 hours, and the stirring speed is 100r / min;

[0029] (2) Stir and mix high-purity nano-calcium oxide and deionized water according to the mass ratio of 1:5 to obtain slurry A, pass slurry A through a 100-mesh sieve and filter to remove slag, and then add 14 times the slurry to the slurry Dilute the quality of material A with deionized water to obtain slurry B, then add the crystal form control agent obtained in step (1) to slurry B, heat to 55°C and stir at constant temperature for 2 hours to obtain slurry C; the crystal form control agent The mass ratio of the amount of agent added to the slurry A is 2:100; the purity of the high-purity nano calcium oxide is above 99.5%, an...

Embodiment 3

[0033] A preparation method for calcium carbonate whiskers, comprising the following steps:

[0034] (1) Dissolve silk fibroin and gum arabic in deionized water and stir well 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 12 hours, and the stirring speed is 150r / min;

[0035] (2) Stir and mix high-purity nano-calcium oxide and deionized water according to the mass ratio of 1:4 to obtain slurry A. Pass slurry A through a 100-mesh sieve and filter to remove slag, and then add 14 times the slurry to the slurry Dilute the quality of material A with deionized water to obtain slurry B, then add the crystal form control agent obtained in step (1) to slurry B, heat to 52°C and stir at constant temperature for 1 hour to obtain slurry C; the crystal form control agent The mass ratio of the amount of agent added to the slurry A is 3:100; the purity of the high-purity nano calcium oxide is above 99.5%, and ...

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Abstract

The invention discloses a preparation method of calcium carbonate whiskers. The preparation method comprises the following steps: dissolving silk fibroin and Arabic gum in deionized water, and fully stirring to obtain a crystal form control agent; stirring and mixing high-purity nano calcium oxide and deionized water to obtain slurry A; sieving the slurry A with a 100-mesh sieve, and filtering toremove slag; adding deionized water into the slurry to dilute to obtain slurry B; adding the crystal form control agent into the slurry B; heating to 50-60 DEG C, stirring for 1-2 hours at a constanttemperature to obtain slurry C, adding ammonia water into the slurry C to adjust the pH value, putting into a super gravity carbonization reactor to perform a carbonization reaction, centrifugally separating the slurry obtained after carbonization to obtain precipitates, drying the precipitates, and crushing to obtain the calcium carbonate whiskers. The problems of difficult crystal form control and easy conversion of aragonite type calcium carbonate into calcite type calcium carbonate in aragonite type calcium carbonate whisker production are solved, and the high-activity needle like calciumcarbonate whisker is obtained.

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 with a single crystal crystal and almost no defects inside the crystal. It is non-toxic, odorless, high mechanical strength, and moldable. It has excellent characteristics such as high weight, high wear resistance and heat resistance, good thermal recession and heat recovery performance, and good compatibility with matrix resin when compounded with plastics, which can improve the processing performance of products and improve mechanical properties, so it is widely used It is used in the fields of automobiles, plastics, electrical parts manufacturing, high-gloss structural parts manufacturing, etc. [0003] There are three types of calcium c...

Claims

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Application Information

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Patent Type & Authority Applications(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