Method for preparing calcium carbonate nano wire

A nanowire and calcium carbonate technology, applied in the field of carbonate, can solve the problems of lack of toughness and insufficient strength of spherical nanomaterials, and achieve the effects of good dispersion, simple and convenient process implementation, and uniform particle size distribution

Inactive Publication Date: 2007-02-21
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The object of the present invention is to provide a method for preparing calcium carbonate nanowires, which solves the defects of physical properties such as insufficient strength and lack of toughness of spherical nanomaterials as additives

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] 1. Add 2g CaCO 3 Dissolve in 100ml of 0.5mol / L acetic acid solution and stir magnetically at constant temperature at 60°C for 2 hours.

[0014] 2. Add 4 g of citric acid to the clear solution obtained above, and continue magnetic stirring at a constant temperature of 60° C. for 12 hours. During the stirring process, the clear solution gradually turns into a milky white milk-like colloid.

[0015] 3. Filter the above-mentioned milky white milk-like colloid, wash with deionized water and absolute ethanol three times, and dry at 50° C. to obtain a white powder, that is, a linear Ca-containing intermediate.

[0016] 4. Slowly raise the temperature of the intermediate to 450° C. at a heating rate of 5° C. / min, keep it warm for 2 hours, and cool naturally to obtain a white powder, that is, calcium carbonate nanowires.

Embodiment 2

[0018] 1. In 0.45mol / L acetic acid solution, add 4g of calcium carbonate and reflux at 60°C for 2 hours.

[0019] 2. Add 4 g of citric acid to the above mixed solution, and continue to reflux for 24 hours to form a flocculent liquid.

[0020] 3. Add 3 g of cetyltrimethylammonium bromide, continue to reflux for 24 hours to form an emulsion, wash 4 times with deionized water and absolute ethanol, and dry at 50°C.

[0021] 4. Heat treatment at 450° C. for 2 hours and heat preservation for 2 hours to obtain calcium carbonate nanowires.

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Abstract

The invention provides a method for preparing calcium carbonate nano wire, wherein a sol-gel thermal decomposition method is employed, the method comprises preparing calcium-containing intermediate compound in the form of nano lines, then subjecting the intermediate compound to heat treatment so as to obtain calcium carbonate nano lines. During the reaction procedure, cetyl trimethyl ammonium bromide can be charged in as surface-active agent, and the speed of temperature elevation during thermal treatment is controlled to be slow.

Description

technical field [0001] The invention belongs to the technical field of carbonates, and in particular provides a method for preparing calcium carbonate nanowires, which uses calcium carbonate powder materials (chemical reagents or natural minerals) to prepare calcium carbonate nanowires with small particle size and uniform dispersion. Background technique [0002] As an important chemical raw material, calcium carbonate is widely used in many fields such as papermaking, plastics, paint, toothpaste, and medicine. Compared with calcium carbonate nanoparticles, calcium carbonate nanowires have the following characteristics: large oil absorption and moderate grinding performance; used in heat-sensitive paints to prevent heat-sensitive oil pollution, high whiteness, and good weather resistance; used in Thermal induction paper has low noise and does not require ink developer; the induction paper added with nano-calcium carbonate can improve whiteness, opacity, and smoothness; it al...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F11/18
Inventor 曹林韩志华刘玉兰
Owner UNIV OF SCI & TECH BEIJING
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