Single dispersing micron chopped fiber-like aragonite type calcium carbonate and preparation method thereof

A technology of calcium carbonate and short fibers, applied in the direction of calcium carbonate/strontium/barium, etc., to achieve the effect of simple method and improved physical strength

Inactive Publication Date: 2005-06-29
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is no disclosure of monodisperse vaterite-type calcium carbonate, short fiber-like, large aspect ratio, and spike-like structure on the surface, and it is precipitated with carbonate and calcium salt in a solution composed of a water-soluble organic solvent and water. Calcium carbonate technology that can control the production of special crystal form and morphology has not been reported

Method used

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  • Single dispersing micron chopped fiber-like aragonite type calcium carbonate and preparation method thereof
  • Single dispersing micron chopped fiber-like aragonite type calcium carbonate and preparation method thereof
  • Single dispersing micron chopped fiber-like aragonite type calcium carbonate and preparation method thereof

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preparation example Construction

[0026] The preparation method of the present invention utilizes the different solubility of water-soluble organic solvents and water to carbonates and calcium salts, and the different solvation effects on calcium ions and carbonates, so as to realize the controllable crystal orientation of calcium carbonate ion deposition And vaterite type, synthesize monodisperse, micron short fibrous shape, large aspect ratio, the specific method of the vaterite type calcium carbonate that the surface is spike structure is as follows:

[0027] The mixed solution of water-soluble organic solvent containing carbonate and water is added to the solution of water-soluble organic solvent containing calcium ion mixed with water under the control of temperature and stirring, and the ion deposition reaction between calcium ion and carbonate occurs in the solution system to form Vaterite-type calcium carbonate with short fibrous surface and spike-like structure, the material liquid is filtered and dehy...

Embodiment 1

[0037] (1) (Liquid A) Solution configuration of water-soluble organic solvent containing carbonate and water

[0038] Add 125 grams of solid sodium carbonate to 5 L of deionized water, stir until completely dissolved, then add 5 L of absolute ethanol, stir evenly, and set aside.

[0039] (2) (Liquid B) The solution configuration of water-soluble organic solvent containing calcium ions mixed with water

[0040] Add 111 grams of anhydrous calcium chloride solids to 5L of deionized water, stir until completely dissolved, then add 5L of absolute ethanol, stir evenly, and set aside.

[0041](3) Add liquid B continuously to the stirred solution A at a temperature of about 25-30°C. After adding the solution B, continue to react for 1.0 hour while maintaining the temperature, then take out the feed liquid, dehydrate, 100-120°C Drying at ℃, the finished product.

[0042] The calcium carbonate powder analysis result that obtains is as follows: SEM photo (see figure 1 ) shows that the...

Embodiment 2

[0044] Change the configuration method of liquid A and liquid B to sodium carbonate or calcium chloride solid and directly add it to the mixed solution of water and ethanol with a volume ratio of 1:1, stir and dissolve into a solution, change the reaction temperature to 5-10°C, and other such as The same method was carried out in Example 1.

[0045] The calcium carbonate powder analysis result that obtains is close to embodiment 1.

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Abstract

The invention relates to a single-distributive micron short fiber-typed vaterite calcium carbonate and its preparing method. The calcium carbonate crystal is needle short fiber-typed, its length is 2-8 micron and width is 0.3-1.5 micron, the ratio of length and diameter is 5-10, its content of vaterite calcium carbonate is larger than 90% with small particle on the surface of. The preparing method includes mix the aqueous solution of carbonate containing water soluble organic solvent with aqueous solution of calcium salt also containing that, make use of the different dissolubility of carbonate and calcium salt in water soluble organic solvent and water, and the different solvation to calcium ion, compound the product. The calcium carbonate has remarkable single distribution, large ratio of length and diameter, high activity of surface, suitable for coating on paper, filling plastic, coating, printing ink and paper, as well as the raw material for calcium preparations.

Description

technical field [0001] The invention relates to a carbonate and a preparation method thereof, in particular to a monodisperse micron short fibrous vaterite type calcium carbonate and a preparation method thereof. Background technique [0002] Precipitated calcium carbonate synthesized by chemical method is widely used as an important industrial filler in industries such as plastics, rubber, paint, paper and ink because of its white color, non-toxicity, low price and easy processing, which not only greatly reduces production costs, but also Brings additional performance to the filled body. [0003] According to the different ways of crystal packing, calcium carbonate exists in three forms: vaterite, aragonite, and calcite. It has been noticed that calcium carbonate with different shapes, sizes and crystal forms has unique properties and characteristics and exhibits excellent functional properties. This kind of calcium carbonate with different crystal forms and shapes is com...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18
Inventor 岳林海
Owner ZHEJIANG UNIV
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