Monodisperse micron level spherical vaterite-type calcium carbonate and its prepn process

A technology of calcium carbonate and vaterite, applied in the direction of calcium carbonate/strontium/barium, etc., can solve the problems of high price and complicated steps, and achieve the effects of simple method, uniform particle size distribution, and simple synthesis method.

Inactive Publication Date: 2007-01-03
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, regular dendritic polymers such as polyamide-amine (PAMAM) need to be synthesized by step-by-step protection-deprotection multi-step iterative methods, and the products of each step need to be strictly purified, the steps are cumbersome, and the price is expensive.

Method used

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  • Monodisperse micron level spherical vaterite-type calcium carbonate and its prepn process
  • Monodisperse micron level spherical vaterite-type calcium carbonate and its prepn process
  • Monodisperse micron level spherical vaterite-type calcium carbonate and its prepn process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] (1) Preparation of calcium salt aqueous solution: This step is for the configuration of an aqueous solution containing calcium ions. 2.775g of anhydrous calcium chloride solid is added to 1L of deionized water, and stirred until completely dissolved, and the pH of the solution is adjusted to 10. Obtaining concentration is 25mmol / L calcium chloride solution, standby;

[0045] (2) Preparation of an aqueous solution containing carbonate or bicarbonate: This step is for the preparation of an aqueous solution containing carbonate ions. Add 2.10 g of sodium bicarbonate solid to 1 L of deionized water, stir until completely dissolved, and adjust the solution The pH value is 10, obtains concentration and is 25mmol / L sodium bicarbonate solution, for subsequent use;

[0046] (3) Preparation of functionalized hyperbranched polymer aqueous solution: This step is for the aqueous solution configuration of carboxyl-functionalized hyperbranched polyester 3rd generation, and 1.0 g of ca...

Embodiment 2

[0051] (1) Preparation of calcium salt aqueous solution: This step is to prepare an aqueous solution containing calcium ions. Add 4.10 g of calcium nitrate solid to 1 L of deionized water, and stir until completely dissolved. Regulate the pH value of solution to be 10, obtain concentration and be 25mmol / L calcium nitrate solution, standby;

[0052] (2) Preparation of an aqueous solution containing carbonate or bicarbonate: This step is for the preparation of an aqueous solution containing carbonate ions. Add 2.50 g of potassium bicarbonate solid into 1 L of deionized water, and stir until completely dissolved. Regulate the pH value of solution to be 10, obtain concentration and be 25mmol / L potassium bicarbonate solution, for subsequent use;

[0053] (3) Preparation of functionalized hyperbranched polymer aqueous solution: This step is for the aqueous solution configuration of carboxyl-functionalized hyperbranched polyester 4th generation, and 3.0 g of carboxyl-functionalized h...

Embodiment 3

[0058] (1) Preparation of calcium salt aqueous solution: This step is to prepare an aqueous solution containing calcium ions. Add 4.10 g of calcium nitrate solid to 1 L of deionized water, and stir until completely dissolved. Regulate the pH value of solution to be 10, obtain concentration and be 25mmol / L calcium nitrate solution, standby;

[0059] (2) Preparation of an aqueous solution containing carbonate or bicarbonate: This step is for the preparation of an aqueous solution containing carbonate ions. Add 1.975 g of ammonium bicarbonate solid to 1 L of deionized water, and stir until completely dissolved. Regulate the pH value of solution to be 10, obtain concentration and be 25mmol / L ammonium bicarbonate solution, standby;

[0060] (3) Preparation of an aqueous solution of functionalized hyperbranched polymer: this step is for the configuration of an aqueous solution of the 3rd generation hyperbranched polyester containing sulfonic acid group functionalization, and 0.3 g o...

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Abstract

The present invention relates to one kind of monodisperse micron level spherical vaterite-type calcium carbonate, which is one kind of organic-inorganic hybridized material comprising inorganic calcium carbonate component with calcium carbonate content of 95-100 wt% and organic component of super branched polymer accounting for 3-10 wt%. The preparation process of the monodisperse micron level spherical vaterite-type calcium carbonate includes the following steps: preparing water solution of calcium salt; preparing water solution of carbonate or bicarbonate; preparing water solution of functional super branched polymer; fast mixing the water solution of calcium salt, the water solution of calcium salt and the water solution of functional super branched polymer at 5-40 deg.c via stirring; ageing for 1-24 hr; centrifugal or filtering separation, washing and stoving to obtain the monodisperse micron level spherical vaterite-type calcium carbonate.

Description

1. Technical field [0001] The present invention relates to a kind of vaterite type calcium carbonate, relate in particular to a kind of micron level monodisperse spherical vaterite type calcium carbonate, also relate to a kind of preparation micron level monodisperse in the presence of carboxyl or sulfonic acid functionalized hyperbranched polymer Spheroidal vaterite calcium carbonate method. 2. Background technology [0002] As an important inorganic chemical filler, calcium carbonate is widely used in rubber products, plastic products, paper industry, building materials, coatings and inks and other industries. The industrial synthesis of light calcium carbonate mainly adopts methods such as passing carbon dioxide into calcium hydroxide suspension or mixing water-soluble carbonate and calcium salt solution. Calcium carbonate synthesized by these methods has the characteristics of white color, cheap, non-toxic and easy to process, but the calcium carbonate produced in this ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18
Inventor 谌东中孟庆伟赵辉
Owner NANJING UNIV
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