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Method of surface modification of nanometer calcium carbonate with wet method

A technology of surface modification of nanometer and nanometer calcium carbonate, applied in the direction of calcium carbonate/strontium/barium, chemical instruments and methods, calcium/strontium/barium compounds, etc., can solve the problem of poor aluminate effect and difficult application of nanometer calcium carbonate and other problems to achieve the effect of improving rheological properties and improving compatibility

Active Publication Date: 2017-06-27
张剑星
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to overcome the problem that aluminate is difficult to apply or the effect is not good in the process of wet modification of nano-calcium carbonate, and to provide a method for preparing nano-calcium carbonate, and to use aluminate for wet modification

Method used

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  • Method of surface modification of nanometer calcium carbonate with wet method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] 1) Weigh low-grade quicklime, ash, remove iron;

[0038] 2) Put it into the digestion reactor filled with hot water, stir, carry out the digestion reaction, let it stand for cooling, sieve, filter the slurry and age;

[0039] 3) Carbon dioxide is introduced into the slurry for carbonization, crystal form control agent is added during the carbonization process, carbonized at 20-30°C until the pH value is 12, and nano-calcium carbonate slurry is obtained.

[0040] 4) aging the nano-calcium carbonate slurry obtained in step 3), settling and concentrating;

[0041] 5) Compound the aluminate coupling agent, citric acid, and sodium oleate as a modifier, and dissolve the compounded modifier in a mixed solvent of water and ethanol for later use; among them, the volume ratio of water and ethanol The mass ratio of aluminate coupling agent, citric acid and sodium oleate is 1:2-4: 1:0.2:0.6;

[0042] 6) Add the modifying agent solution into the concentrated nano-calcium carbonate...

Embodiment 2

[0045] 1) Weigh low-grade quicklime, ash, remove iron;

[0046] 2) Put it into the digestion reactor filled with hot water, stir, carry out the digestion reaction, let it stand for cooling, sieve, filter the slurry and age;

[0047] 3) Carbon dioxide is introduced into the slurry for carbonization, crystal form control agent is added during the carbonization process, carbonized at 20-30°C until the pH value is 12, and nano-calcium carbonate slurry is obtained.

[0048] 4) aging the nano-calcium carbonate slurry obtained in step 3), settling and concentrating;

[0049] 5) Compound the aluminate coupling agent, citric acid, and sodium oleate as a modifier, and dissolve the compounded modifier in a mixed solvent of water and ethanol for later use; among them, the volume ratio of water and ethanol The mass ratio of aluminate coupling agent, citric acid and sodium oleate is 1:2-4: 1:0.2:0.6;

[0050] 6) Add the modifying agent solution into the concentrated nano-calcium carbonate...

Embodiment 3

[0053] 1) Weigh low-grade quicklime, ash, remove iron;

[0054] 2) Put it into the digestion reactor filled with hot water, stir, carry out the digestion reaction, let it stand for cooling, sieve, filter the slurry and age;

[0055] 3) Carbon dioxide is introduced into the slurry for carbonization, crystal form control agent is added during the carbonization process, carbonized at 20-30°C until the pH value is 12, and nano-calcium carbonate slurry is obtained.

[0056] 4) aging the nano-calcium carbonate slurry obtained in step 3), settling and concentrating;

[0057] 5) Compound the aluminate coupling agent, citric acid, and sodium oleate as a modifier, and dissolve the compounded modifier in a mixed solvent of water and ethanol for later use; among them, the volume ratio of water and ethanol The mass ratio of aluminate coupling agent, citric acid and sodium oleate is 1:2-4: 1:0.2:0.6;

[0058] 6) Add the modifying agent solution into the concentrated nano-calcium carbonate...

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Abstract

Disclosed is a method of surface modification of nanometer calcium carbonate with a wet method. The method includes: subjecting quick lime to dissolving, deironing and slaking prior to performing carbonization by adding a crystal-form control agent to obtain nanometer calcium carbonate slurry; compounding an aluminate coupling agent, citric acid and sodium oleate into a modifying agent added into the concentrated nanometer calcium carbonate slurry to obtain the surface modified nanometer calcium carbonate slurry. The nanometer calcium carbonate does not need multiple, stepped surface modification and activation, the activating rate of the surface modified nanometer calcium carbonate can reach above 99%, and size distribution and activity of products are effectively controlled; compatibility between the nanometer calcium carbonate and organic polymers is greatly improved by the aid of the coupling agent, and rheological property of the system is improved.

Description

technical field [0001] The invention relates to a preparation method of calcium carbonate, in particular to a method for wet surface modification of nanometer calcium carbonate. Background technique [0002] Nano calcium carbonate is widely used in rubber industry, plastic industry, paper industry, coating industry, pharmaceutical industry, etc. In application engineering, nano-calcium carbonate needs to be well dispersed in organic media, so that the target material has uniform properties. However, due to the characteristics of nano-calcium carbonate itself, there are certain problems in the application of nano-calcium carbonate. For example, a On the one hand, nanoparticles have high surface energy, are in a thermodynamically unstable state, and are easy to agglomerate; on the other hand, the surface of calcium carbonate obtained by the current common calcium carbonate preparation method is mostly hydrophilic, and it is difficult to achieve uniform dispersion when disperse...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18
CPCC01F11/18C01F11/185
Inventor 张剑星
Owner 张剑星