Preparation method of medium/low-viscosity high-thixotropy nano calcium carbonate for aqueous system

A nano-calcium carbonate, water-based system technology, used in adhesive additives, non-polymer adhesive additives, dyeing low-molecular-weight organic compounds and other directions, can solve the problems of easy agglomeration, high viscosity, poor compatibility, etc. The effect of small average particle size, high whiteness and narrow particle size distribution

Inactive Publication Date: 2011-08-31
淄博嘉泽纳米材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to provide a method for preparing nano-calcium carbonate with low viscosity and high thixotropic performance in the water-based system for the existing nan

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  • Preparation method of medium/low-viscosity high-thixotropy nano calcium carbonate for aqueous system

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Experimental program
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Embodiment 1

[0021] The calcium carbonate ore is cleaned and calcined at 1000°C. After the product is purified, digested and aged, it is prepared by adding water to prepare a calcium hydroxide slurry with a mass fraction of 10%, which is transferred to the membrane dispersion carbonization reactor, and the relative calcium hydroxide is added 0.5% sucrose by mass of calcium hydroxide in slurry. Introduce a mixture of carbon dioxide and air with a volume fraction of 30% carbon dioxide, and use the bubbling method for carbonization synthesis at 17°C. When the pH drops to 6.8, continue to ventilate for 10 minutes to obtain nano-calcium carbonate slurry. Select every 100ml slurry The nano-calcium carbonate slurry with an apparent sedimentation volume of 85-99ml in three hours. Add water to adjust the concentration of nano-calcium carbonate slurry to 10%, take 1000g, heat up to 80°C and stir for 10 minutes, add 2.5g of sodium dodecylbenzenesulfonate, and stir for 1 hour. Weigh 2g of stearic aci...

Embodiment 2

[0023] The calcium carbonate ore is cleaned and calcined at 1000°C. After the product is purified, digested and aged, it is prepared by adding water to prepare a calcium hydroxide slurry with a mass fraction of 10%, which is transferred to the membrane dispersion carbonization reactor, and the relative calcium hydroxide is added 0.5% sucrose by mass of calcium hydroxide in slurry. Introduce a mixture of carbon dioxide and air with a carbon dioxide volume fraction of 30%, and carry out carbonization synthesis at 17°C using the supergravity method. When the pH drops to 6.8, continue to ventilate for 10 minutes to obtain nano-calcium carbonate slurry. Select every 100ml slurry The nano-calcium carbonate slurry with an apparent sedimentation volume of 85-99ml in three hours. Add water to adjust the concentration of nano-calcium carbonate slurry to 10%, take 1000g, heat up to 80°C and stir for 10 minutes, add 1g of ammonium citrate and 1g of sodium hexametaphosphate, and stir for 1...

Embodiment 3

[0025] The calcium carbonate ore is cleaned and calcined at 1000°C. After the product is purified, digested and aged, it is prepared by adding water to prepare a calcium hydroxide slurry with a mass fraction of 10%, which is transferred to the membrane dispersion carbonization reactor, and the relative calcium hydroxide is added 0.5% sucrose by mass of calcium hydroxide in slurry. Introduce a mixture of carbon dioxide and air with a carbon dioxide volume fraction of 30%, and use the membrane dispersion method for carbonization synthesis at 17°C. When the pH drops to 6.8, continue to ventilate for 10 minutes to obtain nano-calcium carbonate slurry. Select every 100ml slurry The nano-calcium carbonate slurry with an apparent sedimentation volume of 85-99ml in three hours. Add water to adjust the concentration of nano-calcium carbonate slurry to 10%, take 1000g, heat up to 80°C and stir for 10 minutes, add 3g of sodium polyacrylate, and stir for 1 hour. Weigh 2g of sodium steara...

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Abstract

The invention relates to a preparation method of nano calcium carbonate, particularly a preparation method of medium/low-viscosity high-thixotropy nano calcium carbonate for an aqueous system, which comprises the following steps: carbonizing a calcium hydroxide suspension and carbon dioxide in a reactor to generate nano calcium carbonate; and carrying out mixed coating on the obtained nano calcium carbonate by liquid-phase coating treatment and surface treatment to obtain highly-dispersed surface-activated nano calcium carbonate powder. The nano calcium carbonate prepared by the method provided by the invention can obviously enhance high thixotropy and low viscosity properties of the aqueous system. After the modified nano calcium carbonate is added into acrylic adhesive, the thixotropic value of the system is greatly enhanced by 290 times, but the viscosity is only enhanced by 10 times. In addition, the nano calcium carbonate prepared by the method has the advantages high whiteness, small average particle size, narrow particle size distribution, high compatibility with the aqueous system, and high stability, and is applicable to the fields of aqueous adhesive, aqueous paint, other aqueous polymers and the like.

Description

technical field [0001] The invention relates to a preparation method of nano-calcium carbonate, in particular to a preparation method of nano-calcium carbonate with low viscosity and high thixotropic performance in an aqueous system. Background technique [0002] Nano-calcium carbonate is an industrialized functional nano-material with large output and low price. Nano-calcium carbonate (NPCC) prepared by precipitation method has great potential in many fields such as adhesives, coatings, plastics, rubber, papermaking, and biological materials. Wide range of applications, according to the international agency ROSKILL predicts that the world PCC (precipitated calcium carbonate) market will reach 16 million tons in 2012. In the application field of nano-calcium carbonate, most products belong to the category of polymers, such as adhesives, coatings, rubber, plastics, etc., and occupy an important market share. [0003] With the continuous improvement of people's awareness of e...

Claims

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Application Information

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IPC IPC(8): C09C1/02C09C3/08C09J11/04C09D7/12C08K9/04C08K3/26
Inventor 赵婷婷娄从江郭安慧陈祥芝朱孝川
Owner 淄博嘉泽纳米材料有限公司
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