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Process for preparing nano CaCO3/SiO2 core-shell structure particle

A shell structure and nanotechnology, applied in chemical instruments and methods, inorganic pigment treatment, fibrous fillers, etc., can solve the problems of increased processing costs, uneven surface coating, environmental pollution, etc., to ensure stability and uniformity , avoid pollution, improve the effect of performance

Inactive Publication Date: 2002-11-06
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the dry method can coat the organic modifier on the surface of the powder, it has the disadvantages of uneven surface coating, physical interaction between the organic modifier and the powder surface, and the like. The flying of inorganic powder is easy to be inhaled by the human body; wet treatment needs to prepare inorganic powder first, and then disperse the inorganic powder in a suitable solvent, the process is complicated, the processing cost is increased, and the use of organic solvent will also cause environmental pollution
With the improvement of people's living standards and the enhancement of environmental protection awareness, the usual inorganic powder surface organic activation treatment process can no longer meet people's needs in terms of economy, health and environmental protection. Therefore, a safe, reliable and effective The method of surface modification of inorganic powders, especially nano-powders, is an urgent problem to be solved at present.
However, there is no relevant report on the method of coating silica on the surface of nano-calcium carbonate and its in-situ hybridization with organic matter.

Method used

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  • Process for preparing nano CaCO3/SiO2 core-shell structure particle
  • Process for preparing nano CaCO3/SiO2 core-shell structure particle
  • Process for preparing nano CaCO3/SiO2 core-shell structure particle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Filter and wash the nano-calcium carbonate suspension without any surface modification to remove residual ions in the system; add the washed nano-calcium carbonate to a 15% sodium silicate aqueous solution under strong stirring, and ultrasonically disperse Continue to stir for 2 hours after the treatment; put the reaction system in a water bath at 75-80°C, and add H with a concentration of 1mol / L dropwise at a rate of 25ml / min. 2 SO 4 Dilute the solution, control the stirring rate to 4000 rpm, and adjust the pH value of the system to 9.5, and age for 4 hours; the reaction product is cooled, filtered, washed and dried at 120°C to obtain nano-calcium carbonate with a core-shell structure / Silica composite particles. Its size, composition, structure and performance are characterized as follows: the size and surface morphology of composite particles

[0021] From attached figure 1 Pure Nano CaCO 3 It can be seen from the electron microscope photos of the particles that...

Embodiment 2

[0034] In the preparation process of the core-shell structure nano calcium carbonate / silicon dioxide composite particles in Example 1, the lipophilicity inducer ethylene glycol with a water phase mass of 18% was added to the system after ultrasonic treatment, and 5 % organic modifier KH-570, and other conditions remain unchanged. After 60 minutes, the product is cooled, filtered, washed and dried at 120°C to obtain a nano-calcium carbonate / silicon dioxide composite with a core-shell structure hybridized with surface organic matter. particle. Its IR characteristics are as follows:

[0035] 3000~2850cm -1 The absorption peak in the range is the result of the C-H bond stretching vibration absorption of alkanes and alkenes at 1717cm -1 and 1629cm -1 The stretching vibration absorption peaks of the C=O bond and the C=C bond appear at respectively; 1512cm -1 is CH 2 base scissor vibration and CH 3 Base's antisymmetric deformation vibration absorption band, 1395cm -1 The absor...

Embodiment 3

[0037] In the preparation process of the composite particles in Example 1, 15% ethylene glycol and 15% ethanol were added to the water phase after the system was ultrasonically treated, and 15% organic modifier A-151 was added after aging for 3 hours. Material, all the other conditions are constant, and the gained product IR spectrum analysis is as follows:

[0038] 3000~2850cm -1 The absorption peak within the range is due to the absorption of C-H bond stretching vibration on alkanes and alkenes; 1628cm -1 is the stretching vibration absorption of the C=C bond; CH 2 base scissor vibration and CH 3 The anti-symmetrical deformation vibration absorption of the base is at 1510-1400cm -1 at; 1297cm -1 The absorption peak at the Si-O group is the stretching vibration absorption; the antisymmetric stretching vibration absorption peak of the Si-C group appears at 1200-1050cm -1 Within range; 867cm -1 is the symmetrical stretching vibration absorption of Si-O-C bonds; 783cm -1 ...

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Abstract

The present invention relates to the preparation of nano CaCo3 / SiO2 core-shell structure particle and its organic hybrid. Under the action of acid matter, silicate in water suspension of sodium silicate containing nano calcium carbonate is hydrolyzed and condensated to produce sol deposited onto the surface of nano calcium carbonate to form nano CaCO3 / SiO2 composite particle in core-shell structure. During the preparation of the composite particle, lipophilic revulsant and organic activator may be added so as to obtain nano CaCO3 / SiO2 composite particle with organic hybridized surface. The nano CaCO3 / SiO2 composite particle has SiO2 shell jointed via chemical bond to the surface of CaCO3 particle, and the organic modified is jointed to the surface of nano CaCO3 / SiO2 composite particle also via chemical bond.

Description

technical field [0001] The present invention relates to a kind of nano CaCO 3 / SiO 2 The preparation method of core-shell structure composite particles and organic hybrids thereof. Background technique [0002] CaCO is commonly used in industries such as coatings, rubber, plastics and paper 3 As a filler, its purpose is mainly to reduce the cost of materials. The development of nanotechnology makes nanoscale CaCO 3 Appeared in large numbers, and the continuous progress of nano-composite technology has made nano-CaCO 3 It is possible to be used in traditional industries such as plastics and rubber. In addition to reducing costs, there are also reports in the literature that nano-CaCO 3 It can also play a role in strengthening and toughening. Nano-CaCO 3 Used as a pigment filler in the paint industry, although it has fineness, uniformity, high whiteness, and good optical properties, it has a steric hindrance effect on the denser lithopone in the system and plays an anti...

Claims

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Application Information

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IPC IPC(8): C09C1/28C09C3/06
Inventor 曾汉民刘国军
Owner SUN YAT SEN UNIV
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