A method for synthesizing mixed crystalline nanometer calcium carbonate with controllable content

Abstract

The invention provides a content-controllable mixed crystal form nano calcium carbonate synthesis method, and relates to a method for preparing nano calcium carbonate materials. The method aims to solve the problems that in the prior art, nano materials with various mixed calcium carbonate crystal forms cannot be prepared, and the content of the alcium carbonate crystal forms in the materials cannot be controlled. The synthesis method includes the steps that 1, a calcium chloride-polyaspartic acid mixed solution is prepared; 2, a sodium carbonate solution is prepared; 3, mixed microemulsion is prepared; 4, sodium carbonate emulsion is prepared; 5, the mixed microemulsion is mixed with the sodium carbonate emulsion, centrifugal separation, ethyl alcohol washing and drying are sequentially conducted on the mixture, and mixed crystal form nano calcium carbonate is obtained. The synthesis method has the advantages that the content of vaterite type calcium carbonate in the calcite and vaterite mixed crystal form nano calcium carbonate is controlled by adjusting concentration of polyaspartic acid in the calcium chloride-polyaspartic acid mixed solution prepared in step 1. The synthesis method is mainly used for preparing the mixed crystal form nano calcium carbonate.

Description

technical field [0001] The invention belongs to the field of preparation of inorganic calcium carbonate materials, and in particular relates to a preparation method of nanometer calcium carbonate materials. Background technique [0002] Nano-calcium carbonate materials have the advantages of simple synthesis, porous, easy surface modification, multi-morphology, non-toxicity, and good biocompatibility, and are widely used in food, biomedicine, fillers, chemicals, and the environment. [0003] Chu Yanhong et al. (CN201310570950.3) disclose a method for preparing vaterite nano-calcium carbonate by microemulsion. This method can only obtain pure vaterite-type nano-calcium carbonate material, but cannot prepare nano-materials mixed with various calcium carbonate crystal forms , and the content of the calcium carbonate crystal form in the material cannot be regulated. Contents of the invention [0004] The purpose of the present invention is to solve the problem that the existi...

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the existing technology cannot prepare nanomaterials mixed with various calcium carbonate crystal forms, nor can it realize the problem that the content of calcium carbonate crystal forms in the material cannot be adjusted, and provide a controllable mixed content Synthetic method of mixed crystal form nano-calcium carbonate

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