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Prepn process of silica sol modified nanometer CaCO3 composite particle

A composite particle, silica sol technology, applied in the direction of calcium carbonate/strontium/barium, etc., can solve the problems of modified particle dispersibility, stable application performance, etc., to increase compatibility, improve dispersion, improve dispersive effect

Inactive Publication Date: 2009-01-28
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the limitations of the preparation process, the prepared nano-CaCO 3 Modified nano-CaCO 3 The contact angle with the polar solvent is reversed, but the modifier used in this study is not the silica sol used in the present invention, and the study has not improved the dispersion, stability and application performance of the prepared modified particles. and

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Weigh 5g of silica sol (synthesized in this laboratory, pH value is 2.5, particle size is 3nm, solid content is 20%), raise the temperature to 20°C, under the action of strong stirring, 400g size is 10nm nanometer CaCO 3 Water dispersion (8% solid content) is slowly added, and after ultrasonic dispersion treatment for 1.5h, continue to stir vigorously for more than 2h, and nano-CaCO with core-shell structure can be obtained. 3 / SiO 2 Composite particles (SiO 2 Accounted for CaCO 3 Amount of 3.1%) aqueous dispersion, its solid content is about 8.1%.

Embodiment 2

[0019] Take by weighing 18g of silica sol (synthesized in this laboratory, pH value is 4.0, particle diameter is 10nm, solid content is 35%), raises temperature to 40 ℃, 400g size is 30nm nano CaCO 3 Water dispersion (15% solid content) is slowly added, and after ultrasonic dispersion treatment for 1.5h, continue to stir vigorously for more than 2h, and nano-CaCO with core-shell structure can be obtained. 3 / SiO 2 Composite particles (SiO 2 Accounted for CaCO 3 Amount of 10.5%) aqueous dispersion, its solid content is about 15.9%.

Embodiment 3

[0021] Weigh 30g of silica sol (synthesized in this laboratory, the pH value is 5.5, the particle size is 25nm, and the solid content is 40%), raise the temperature to 65°C, and mix 400g of 50nm nanometer CaCO 3 Water dispersion (solid content: 30%) is slowly added, and after 1.5 hours of ultrasonic dispersion treatment, continue to stir vigorously for more than 2 hours, and nano-CaCO with core-shell structure can be obtained. 3 / SiO 2 Composite particles (SiO 2 Accounted for CaCO 3 Consumption amount 10%) aqueous dispersion, its solid content is 30.7%.

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PUM

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Abstract

The present invention relates to preparation process of nanometer CaCO3 / SiO2 composite particle. Through mixing nanometer CaCO3 water suspension and silica sol in certain stoichiometric ratio via powerful stirring, ultrasonic dispersing treatment, heating while further stirring to dewater and condensate small size nanometer silica sol with high surface activity, and depositing on the surface of nanometer CaCO3 to prepare nanometer CaCO3 / SiO2 composite particle of size 40-60 nm and high surface activity. The nanometer CaCO3 / SiO2 composite particle in core-shell structure has high stability in water, capacity of being dispersed homogeneously in polymer, high storage stability, excellent heat resistance and dispersivity in water soluble polymer, and is used in preparing organic-inorganic hybridized material.

Description

technical field [0001] The invention relates to a silica sol-modified nano-CaCO with stable storage, excellent heat resistance, good dispersion in water-based polymer compounds, and core-shell structure. 3 Preparation method of composite particles. Background technique [0002] In recent years, with the continuous deepening of research on organic-inorganic hybrid materials, nano-CaCO 3 has become a research hotspot in this field. However, due to the nano-CaCO 3 The particle size is small, the specific surface area is small, and the surface energy is large, making them easy to gather together, resulting in the preparation of polymer / nano-CaCO 3 The problem of poor dispersion in composite materials, and the disadvantages of poor acid resistance and high surface pH of nanometer also limit its application range. Although current research on nanoscale CaCO 3 Research on the modification of polymers is changing with each passing day, and great progress has been made to a cert...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F11/18
Inventor 杨冬亚邱凤仙
Owner JIANGSU UNIV