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Preparation method of nano calcium carbonate with low viscocity and high thixotropic property

A nano-calcium carbonate, high thixotropic technology, applied in nanotechnology, non-polymer adhesive additives, dyed low molecular organic compound treatment and other directions, can solve the problems of poor dispersion, low viscosity, high viscosity, achieve low viscosity, Great thixotropy, cost reduction effect

Inactive Publication Date: 2011-08-24
淄博嘉泽纳米材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing nano-calcium carbonate with low viscosity and high thixotropy, aiming at the disadvantages of poor dispersibility, small thixotropy and high viscosity in the application of existing active nano-calcium carbonate in the application of adhesive and sealant systems

Method used

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  • Preparation method of nano calcium carbonate with low viscocity and high thixotropic property

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Experimental program
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Effect test

Embodiment 1

[0016] 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 weight fraction of 10%, which is transferred to the membrane dispersion carbonization reactor, and the relative calcium hydroxide is added 0.5% sucrose by weight of calcium hydroxide in the suspension. Introduce a mixture of carbon dioxide and air with a volume fraction of 30% of carbon dioxide at 17°C for carbonization synthesis using the supergravity method. When the pH drops to 6.8, continue to ventilate for 10 minutes to obtain nano-calcium carbonate slurry. The apparent sedimentation volume is the nanometer calcium carbonate slurry of 85-99ml. Add water to adjust the weight fraction of the nano-calcium carbonate slurry to 10%, take 1000 g of the nano-calcium carbonate slurry, heat up to 80° C. and stir for 10 minutes. Weigh 3 g of carboxystearic acid, and saponify with 0.35 g of c...

Embodiment 2

[0018] 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 weight fraction of 10%, which is transferred to the membrane dispersion carbonization reactor, and the relative calcium hydroxide is added 0.5% beet sugar by weight of calcium hydroxide in the suspension. Infuse a mixture of carbon dioxide and air with a volume fraction of 30% carbon dioxide at 17°C for carbonization synthesis using the membrane dispersion method. When the pH drops to 6.8, continue to ventilate for 10 minutes to obtain nano-calcium carbonate slurry. The apparent sedimentation volume is the nanometer calcium carbonate slurry of 85-99ml. Add water to adjust the weight fraction of the nano-calcium carbonate slurry to 10%, take 1000 g of the nano-calcium carbonate slurry, heat up to 80° C. and stir for 10 minutes. Weigh 1.5 g of hydroxystearic acid, and saponify with 0.18 ...

Embodiment 3

[0020] 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 weight fraction of 10%, which is transferred to the membrane dispersion carbonization reactor, and the relative calcium hydroxide is added 0.5% maltose by weight of calcium hydroxide in the suspension. Infuse a mixture of carbon dioxide and air with a volume fraction of 30% carbon dioxide at 17°C for carbonization synthesis using the membrane dispersion method. When the pH drops to 6.8, continue to ventilate for 10 minutes to obtain nano-calcium carbonate slurry. The apparent sedimentation volume is the nanometer calcium carbonate slurry of 85-99ml. Add water to adjust the weight fraction of the nano-calcium carbonate slurry to 10%, take 1000 g of the nano-calcium carbonate slurry, heat up to 80° C. and stir for 10 minutes. Weigh 2.5 g of monoglyceride stearate and saponify with 0.25 g...

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Abstract

The invention relates to a preparation method of nano calcium carbonate, and in particular relates to a preparation method of nano calcium carbonate with low viscocity and high thixotropic property. The method comprises the following steps: calcining, purifying and digesting the preferential limestone; controlling carbonization in a reactor to obtain the nano calcium carbonate rawstock; performing composite surface modification treatment on the rawstock by use of fatty acid or fatty acid derivatives and a coupling agent through a practical control process; and finally performing dehydration, drying, crushing and classification. The invention has the advantages that: the method is reasonable and reliable, ensures stable product quality, is favorable for continuous operation of production, and reduces the cost. The product produced by the method has low viscosity, high thixotropic property and good system compatibility and storage stability, and is applicable to the polymer systems such as polyurethane systems, epoxy systems, acrylic acid systems, amino resin sealants 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. Background technique [0002] Nano-calcium carbonate refers to ultra-fine calcium carbonate powder with a particle size of less than 100nm, while active nano-calcium carbonate refers to a chemical product that changes from hydrophilic to lipophilic after surface organic treatment of nano-calcium carbonate. It has good compatibility and dispersion in the polymer matrix, and is widely used in the fields of plastics, rubber and adhesives. The active nano-calcium carbonate used in adhesives and sealants not only has a good reinforcing effect, but also can adjust the rheological properties of the product, and solve the defects of easy flow, poor extrudability and low strength caused by ordinary calcium carbonate. , a large number of expensive fumed silica, with high pra...

Claims

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Application Information

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IPC IPC(8): C09C1/02C09C3/08C09J11/04B82Y40/00
Inventor 娄从江李常林赵婷婷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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