Preparation method of spherical nano calcium carbonate

A nano-calcium carbonate and calcium carbonate technology, applied in the field of nanomaterials, can solve the problems of large product particle size, cumbersome synthesis steps, and various reagents, and achieve the effects of uniform size distribution, low cost and simple preparation process.

Inactive Publication Date: 2012-07-11
LANZHOU JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the above-mentioned methods, there may be disadvantages such as large particle size of the product, insufficient uniformity of appearance, cumbersome synthesis steps, and a wide variety of reagents used.

Method used

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  • Preparation method of spherical nano calcium carbonate
  • Preparation method of spherical nano calcium carbonate
  • Preparation method of spherical nano calcium carbonate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Weigh 2.65g of sodium carbonate, add water to dissolve, and prepare a 0.1mol / L sodium carbonate solution in a 250ml volumetric flask; weigh 22.2g of anhydrous calcium chloride, add water to dissolve, and prepare a 2mol / L solution in a 100ml volumetric flask Calcium chloride solution; measure 200ml of 0.1mol / L sodium carbonate solution in a 500ml beaker, then add 0.02g of pentaerythritol, the amount is based on 1% of the final product calcium carbonate mass, stir to make it completely dissolve; stirring speed Set to 800r / min, then slowly add 10ml of 2mol / L calcium chloride solution dropwise to the above solution, after the dropwise addition is completed, a nano-calcium carbonate slurry is obtained, and the slurry is continued to be stirred for 30min; the obtained nano-calcium carbonate particle Transmission electron microscope pictures as figure 1 As shown, it can be seen from the figure that the nano-calcium carbonate is spherical in shape, its particle size is about 25...

Embodiment 2

[0029] Weigh 2.65g of sodium carbonate, add water to dissolve, and prepare a 0.1mol / L sodium carbonate solution in a 250ml volumetric flask; weigh 22.2g of anhydrous calcium chloride, add water to dissolve, and prepare a 2mol / L solution in a 100ml volumetric flask Calcium chloride solution; measure 200ml of 0.1mol / L sodium carbonate solution in a 500ml beaker, then add 0.002g of pentaerythritol, the amount is based on 0.1% of the final product calcium carbonate quality, stir to make it completely dissolved; stirring speed Set to 800r / min, then slowly add 10ml of 2mol / L calcium chloride solution dropwise to the above solution, after the dropwise addition is completed, a nano-calcium carbonate slurry is obtained, and the slurry is continued to be stirred for 30min; the obtained nano-calcium carbonate particle Transmission electron microscope pictures as figure 2 As shown, it can be seen from the figure that the nano-calcium carbonate is basically spherical, its particle size is...

Embodiment 3

[0031] Weigh 0.1g of sodium stearate (measured by 5% of the mass of calcium carbonate) and stir to dissolve it in 50ml of water at 70°C. After the sodium stearate is completely dissolved, slowly add it to the nanocarbonate prepared in Example 1. In the calcium slurry, after continuing to stir for 30min evenly, obtain the nano-calcium carbonate particle modified by sodium stearate, and the transmission electron microscope photograph of product is as follows: image 3 As can be seen from the characterization of the transmission electron microscope, the surface of the spherical nano-calcium carbonate is successfully coated with one deck of sodium stearate.

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Abstract

The invention provides a preparation method of spherical nano calcium carbonate, which is characterized by enabling pentaerythritol to be added in 0.05-0.10 mol/L of sodium carbonate solution to completely dissolve, and slowly adding 1.0-2.0mol/L of calcium chloride solution under blending for reaction to obtain the spherical nano calcium carbonate, wherein the dosage of the pentaerythritol is 0.1-2% of the quality of the product calcium carbonate. Grain size of the btained spherical nano calcium carbonate is about 25nm, size and distribution are even, the whole preparation process is simple,a used crystal form control agent is slow in cost, simultaneously serous fluid obtained by reaction is added in sodium stearate according to 1-5% of the quality of the calcium carbonate, the nano calcium carbonate coated with the sodium stearate is obtained, and the method is applicable to industrialization production of the spherical nano calcium carbonate.

Description

technical field [0001] The invention belongs to the field of nanometer materials, and relates to a preparation method of nanometer calcium carbonate, in particular to a preparation method of spherical nanometer calcium carbonate. Background technique [0002] Nano-calcium carbonate is a new type of industrial raw material widely used in rubber, plastics, papermaking, ink, coatings and other fields. Its performance mainly depends on the morphology, particle size and particle size distribution of nano-calcium carbonate. Nano-calcium carbonate with different shapes has different applications and functions. Since the morphology of calcium carbonate growth is affected by the crystal form of calcium carbonate, it is easier to obtain square nano-calcium carbonate during preparation. However, the unique shape and performance of spherical nano-calcium carbonate can endow products with higher application performance and added value, which is a development hotspot in this industry. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18B82Y40/00C09C1/02C09C3/08
Inventor 王农王兴权陈辉生卢文斌刘志博李文涛
Owner LANZHOU JIAOTONG UNIV
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