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Preparation method of surface modified nano calcium carbonate

A technology for surface modification of nanometer and calcium carbonate, which is applied in the direction of calcium carbonate/strontium/barium, etc., which can solve the problems that the dispersibility cannot meet the application, and achieve the effects of preventing adhesion, increasing adsorption capacity, and good dispersibility

Inactive Publication Date: 2005-07-27
吉林省长吉图教育发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, fatty alcohols or fatty acids are mainly used as modifiers in industrial production to improve the dispersibility of calcium carbonate, but the dispersibility still cannot meet the needs of applications.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Take 100g CaO, add 900ml deionized water, heat to 60°C, and pass 35% CO under full stirring 2 , the speed is 4l / min, stop the ventilation after 80min of carbonization, dissolve 6g of sodium stearate in 100ml of hot water at a temperature of 70°C, add it to the above system, continue stirring for 60min, then add 2g of CaCl 2 After 20 minutes, stop stirring and heating, place at room temperature for 350 minutes, filter, and dry at 60° C. to obtain surface-modified cubic nano-calcium carbonate with an average particle size of 80 nm.

Embodiment 2

[0012] Take 70g CaO, add 930ml deionized water, heat to 40°C, and pass 25% CO under full stirring 2 , the rate is 2l / min, after 200min of carbonization, stop the ventilation, dissolve 3g of sodium palmitate in 100ml of hot water at a temperature of 50°C, add it to the above system, stir for 180min, then add 0.6g of MgSO 4 After 90 minutes, the stirring and heating were stopped, and after standing at room temperature for 40 minutes, it was filtered and dried at 80° C. to obtain surface-modified acicular nano-calcium carbonate with an average particle diameter of 90 nm and a length of about 1 μm.

Embodiment 3

[0014] Take 35g of CaO, add 965ml of deionized water, heat to 80°C, and pass 30% CO under full stirring 2 , the rate is 1.5l / min, stop the ventilation after 70min of carbonization, dissolve 3.6g of sodium eicosate in 100ml of hot water at a temperature of 80°C, add it to the above system, continue stirring for 30min, then add 1.2g of BaCl 2 After 60 minutes, stop stirring and heating, place at room temperature for 120 minutes, filter, and dry at 40° C. to obtain surface-modified cubic nano-calcium carbonate with an average particle size of 40 nm.

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PUM

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Abstract

The preparation method of surface modified nano calcium carbonate is characterized by including the following steps: after carbonizatino for synthesizing nano calcium carbonate by using calcium oxide and CO2 gas as raw material making two surface modification treatment steps: first step adopts saturated fatty acid sodium salt as surface modifiying agent, its molecular formula is CH3(CH2)nCOONa (n=10,12,14,16 and 18), and its dose is 3-6 of weight of calcium carbonate; and second step continuous adds a water soluble bivalent metal salt as surface modifying agent, for example CaCl2, MgCl2, BaCl2 and MgSO4 etc. its dose is 0.5-2.5% of calcium carbonate weight.

Description

Technical field: [0001] The invention relates to a preparation method of surface-modified nanometer calcium carbonate. Background technique: [0002] Nano-calcium carbonate refers to calcium carbonate with an average particle size between 1-100nm, which can be used as a reinforcing agent for plastics, rubber, polymer resins, etc., to improve product performance and product quality. Usually, the surface of calcium carbonate particles is hydrophilic and cannot be well dispersed in polymer materials, so surface modification is required to improve its compatibility with polymer materials. At present, fatty alcohols or fatty acids are mainly used in industrial production as modifiers to improve the dispersibility of calcium carbonate, but the dispersibility still cannot meet the needs of the application. Invention content: [0003] According to the theory of colloidal stability, the invention provides a method for preparing surface-modified nano-calcium carbonate which can imp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F11/18
Inventor 杨文胜周华起白玉白李铁津
Owner 吉林省长吉图教育发展有限公司