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Process for preparing high thixotropic nano calcium carbonate

A technology of nano-calcium carbonate and thixotropy, applied in the direction of calcium carbonate/strontium/barium, etc., can solve the problems of poor thixotropy and narrow particle size distribution range of nano-calcium carbonate, and achieve narrow particle size distribution range, good crystal development, good thixotropic effect

Inactive Publication Date: 2007-08-15
上海耀华纳米科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0016] Aiming at the defect of poor thixotropy of nano-calcium carbonate currently used in the coating and adhesive industry, the purpose of the present invention is to provide a method for preparing nano-calcium carbonate with high thixotropy, and to prepare a nano-calcium carbonate with good crystal development and narrow particle size distribution range. , and nano calcium carbonate with high thixotropy

Method used

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  • Process for preparing high thixotropic nano calcium carbonate
  • Process for preparing high thixotropic nano calcium carbonate
  • Process for preparing high thixotropic nano calcium carbonate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] at 2m 3 Add 0.8m to the reactor 3 Concentration is the calcium hydroxide slurry of 4% (weight concentration, is converted into calcium carbonate content concentration and is 56g / l), and reaction initiation temperature is controlled at 18 ℃, adds 3.36g citric acid and stirs before reaction begins, feeds CO2 then 2 The kiln gas with a content of 25% (volume concentration) is carbonized, and the flow rate of the kiln gas is 7.5m 3 / h, add 224g lactic acid after carbonization for 0.5h, continue carbonization to pH value 7, then add 0.016molC 12 S and 0.024molSDS, stirred for 0.5h to obtain uniformly dispersed nano-calcium carbonate slurry.

[0052] Dissolve 1254g of stearic acid and 164g of sodium hydroxide in water at 85°C for saponification. After the pH value is stable, add 77g of calcium hydroxide to continue saponification for 1 hour to make a coating solution, and then add it to the carbonized slurry. for 30 minutes. Press filtration and drying to obtain nanopowde...

Embodiment 2

[0058] at 2m 3 Add 0.8m to the reactor 3 Concentration is the calcium hydroxide slurry of 4% (weight concentration, is converted into calcium carbonate content concentration and is 56g / l), and reaction initiation temperature is controlled at 25 ℃, adds 3.36g citric acid and stirs before reaction begins, feeds CO2 then 2 The kiln gas with a content of 17% (volume concentration) is carbonized, and the flow rate of the kiln gas is 10m 3 / h, add 224g sulfuric acid after carbonization for 0.5h, continue carbonization to pH value 7, then add 0.016molC 12 S and O.024molSDS, stirred for 0.5h to obtain uniformly dispersed nano-calcium carbonate slurry.

[0059] Dissolve 1254g of stearic acid and 164g of sodium hydroxide in water at 85°C for saponification. After the pH value is stable, add 77g of calcium hydroxide to continue saponification for 1 hour to make a coating solution, and then add it to the carbonized slurry. for 30 minutes. Press filtration and drying to obtain nanopowd...

Embodiment 3

[0063] at 2m 3 Add 0.8m to the reactor 3 Concentration is the calcium hydroxide slurry of 4% (weight concentration, is converted into calcium carbonate content concentration and is 56g / l), and reaction initiation temperature is controlled at 40 ℃, adds 3.36g citric acid and stirs before reaction begins, feeds CO2 then 2 The kiln gas with a content of 17% (volume concentration) is carbonized, and the flow rate of the kiln gas is 7.5m 3 / h, add 224g sulfuric acid after carbonization 0.5h, continue carbonization to pH value 7, then add 22.4g hydrolyzed polyacrylamide (PHPA), stir 0.5h, obtain the evenly dispersed nano calcium carbonate slurry.

[0064] Dissolve 1254g of stearic acid and 164g of sodium hydroxide in water at 85°C for saponification. After the pH value is stable, add 77g of calcium hydroxide to continue saponification for 1 hour to make a coating solution, and then add it to the carbonized slurry. for 30 minutes. Press filtration and drying to obtain nanopowder. ...

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Abstract

A process for preparing the high-thixotropy calcium carbonate nano-particles used for paint or adhesive includes such steps as digestion, carbonizing, coating and drying.

Description

technical field [0001] The invention relates to a preparation method of calcium carbonate used in the technical field of chemical coatings and adhesives, in particular to a preparation method of highly thixotropic nano calcium carbonate. Background technique [0002] Thixotropy is one of the important contents of the rheology research of dispersion system, which refers to a rheological phenomenon in which the viscosity or shear force of the system changes with time under agitation or other mechanical action. [0003] Positive thixotropy (Positive thixotropy) refers to the viscosity of the system decreases with time under the action of external force, and then recovers after standing still, that is, the thinning phenomenon with time factor. [0004] Negative thixotropy is just the opposite of positive thixotropy. It is a thickening phenomenon with time factor, that is, under the external shear force or shear speed, the viscosity of the system rises and recovers after standing...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F11/18
Inventor 颜培刚张华黎绍北蔡琨
Owner 上海耀华纳米科技有限公司
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