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Preparation method for vaterite-phase calcium carbonate microspheres with uniform size

A calcium carbonate and vaterite technology, applied in the direction of calcium carbonate/strontium/barium, nanotechnology, etc., can solve the problem of insufficient size uniformity of calcium carbonate microspheres, improve coating properties and filling performance, and the preparation method is simple and fast. , the effect of uniform size and height

Inactive Publication Date: 2012-06-27
HANGZHOU NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] There are two places to be improved in the above-mentioned method, (1) used organic solvent in the calcium carbonate synthesis process, such as methyl alcohol or N, N-dimethylformamide; (2) calcium carbonate microsphere size uniformity is not high enough
At present, there is no report on the preparation of calcium carbonate microspheres with highly uniform vaterite phase size in pure water solvent.

Method used

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  • Preparation method for vaterite-phase calcium carbonate microspheres with uniform size
  • Preparation method for vaterite-phase calcium carbonate microspheres with uniform size
  • Preparation method for vaterite-phase calcium carbonate microspheres with uniform size

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] (1) Configuration of calcium salt solution: Dissolve 0.5mol of anhydrous calcium chloride in 1L of deionized water to obtain a concentration of 0.5mol L -1 Calcium chloride solution, set aside.

[0043] (2) Configuration of carbonate-containing aqueous solution: Weigh 0.5mol of sodium carbonate solid, dissolve it in 1L deionized water, and obtain a concentration of 0.5mol L -1 Sodium carbonate solution, set aside.

[0044] (3) Configuration of double hydrophilic hyperbranched polymer aqueous solution: weigh 0.5g hyperbranched polymer, dissolve it in 0.5L deionized water, and obtain a concentration of 1g L -1 polymer solution.

[0045] In this step, the preparation method of hyperbranched polymer is as follows

[0046] (A) Weigh 1 gram of hydroxyl-terminated hyperbranched polyglycidyl ether and dissolve it in 40 mL of anhydrous pyridine, and heat to dissolve. (B) After the solution was cooled to room temperature, 0.85 g of succinic anhydride was added thereto, and th...

Embodiment 2

[0049] Change the configuration of the calcium salt solution in step (1) to: dissolve 0.5 mol of calcium nitrate in 1L of deionized water to obtain a concentration of 0.5 mol L -1 Calcium nitrate solution, set aside.

[0050] Subsequent steps are operated with embodiment 1, and white calcium carbonate powder 0.012g is obtained, and the analysis result of gained product is as follows: the calcium carbonate powder that obtains is the spherical particle of size height uniformity, and particle diameter is 3.6 microns, and crystal form is vaterite phase, aggregates The material content is 7wt%.

Embodiment 3

[0052] Change the configuration of the carbonate-containing aqueous solution in step (2) to: Weigh 0.5mol of potassium carbonate solid, dissolve it in 1L deionized water, and obtain a concentration of 0.5mol L -1 Potassium carbonate solution, set aside.

[0053] Other step operation is the same as embodiment 1, makes white calcium carbonate powder 0.012g, and gained product analysis result is as follows: the calcium carbonate powder that obtains is the spherical particle of size height uniformity, and particle diameter is 3.8 microns, and crystal form is vaterite phase, and polymerization The material content is 7wt%.

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Abstract

The invention discloses a preparation method for vaterite-phase calcium carbonate microspheres with a uniform size, comprising the following step of: using a double-hydrophilic hyperbranched polymer molecule as a template, and performing precipitation reaction between water-soluble calcium salt and carbonate to prepare. The calcium carbonate microspheres prepared by the method are organic-inorganic hybrid materials containing 7-10 wt% of hyperbranched polymer. The particle size of the microspheres can be adjusted in a range between 2 to 4.5 microns by controlling reaction conditions. The product prepared by the method disclosed by the invention is highly uniform in size, green and environment-friendly in synthesis process, and with a certain application prospect.

Description

1. Technical field [0001] The invention relates to a preparation method of calcium carbonate microspheres with uniform vaterite phase size, in particular to a method for preparing micron-sized calcium carbonate microspheres with double-hydrophilic hyperbranched polymers. 2. Background technology [0002] Hyperbranched polymer (hyperbranched polymer) is a highly branched polymer (highly branched polymer), which is one of the hotspots in the field of polymer research in the past two decades. The prospect of application has been widely concerned by the scientific and industrial circles. Highly branched polymers have been considered as the fourth class of polymers after linear, lightly branched, and crosslinked polymers. Hyperbranched polymers have a three-dimensional structure, good solubility, low viscosity, and a large number of terminal functional groups in the molecule. At the same time, hyperbranched polymers can be synthesized in one step without multi-step synthesis an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18B82Y40/00
Inventor 董文勇李勇进颜德岳
Owner HANGZHOU NORMAL UNIVERSITY
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