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Preparation method and dispersing method of nano CaCO3/SiO2 composite particle

A composite particle and nanotechnology, which is applied in the fields of calcium/strontium/barium compounds, calcium carbonate/strontium/barium, chemical instruments and methods, etc. Easy to disperse, simple process effect

Active Publication Date: 2016-08-03
GUANGXI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the direct use of powder cannot reflect its nano performance and advantages

Method used

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  • Preparation method and dispersing method of nano CaCO3/SiO2 composite particle
  • Preparation method and dispersing method of nano CaCO3/SiO2 composite particle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Put 27.97g of quicklime into 280g of water at 80°C, and digest it for 2h with a dispersing disc at 1000rpm. Pass the obtained calcium hydroxide suspension through a 200-mesh standard sieve, add water to form a suspension with a mass fraction of 12wt%, age for 24h, and set aside;

[0029] (2) Disperse the calcium hydroxide suspension in step (1) with a dispersing disc at 1000rpm in line-cutting mode, add 0.6% sulfuric acid solution, control the carbonization temperature at 15°C, and inject CO from the bottom 2 / N 2 Mixed gas (60 / 120m 3 h -1 m -3 Suspension), for carbonization, 5min after the start of the carbonization reaction, add 0.5% PEG-600 and 5% silica sol solution (the SiO 2 The average particle size is 5-10nm), and finally carbonized to pH=6.5 to obtain the composite particle slurry;

[0030] (3) Heat the slurry water bath in step (2) to 80°C, and pass a small amount of CO in the process 2 / N 2 The mixed gas keeps the pH=7.0, completely carbonizes the c...

Embodiment 2

[0034] (1) Put 24.76g of quicklime into 280g of water at 70°C and digest it for 3h with a dispersing disc at 1000rpm. The obtained calcium hydroxide suspension is passed through a 200-mesh standard sieve, then water is added to form a suspension with a mass fraction of 11wt%, aged for 20 hours, and set aside;

[0035] (2) Disperse the calcium hydroxide suspension in step (1) with a dispersing disc at 1000rpm, add 0.9% sodium hexametaphosphate, control the carbonization temperature at 20°C, and inject CO from the bottom 2 / N 2 Mixed gas (60 / 120m 3 h -1 m -3 Suspension) for carbonization, 10min after the start of the carbonization reaction, add 1.0% PEG-800 and 10% silica sol solution (the SiO 2 The average particle size is 5-10nm), and finally carbonized to pH=6.8 to obtain the composite particle slurry;

[0036] (3) Heat the slurry water bath in step (2) to 90°C, and pass a small amount of CO in the process 2 / N 2 The mixed gas keeps the pH=7.0, completely carbonizes th...

Embodiment 3

[0040] (1) Put 22.95g of quicklime into 280g of water at 70°C and digest it for 2h with a dispersing disc at 1000rpm. Pass the obtained calcium hydroxide suspension through a 200-mesh standard sieve, add water to form a suspension with a mass fraction of 10wt%, age for 22 hours, and set aside;

[0041] (2) Disperse the calcium hydroxide suspension in step (1) with a dispersing disc at 1000rpm, add 1.0% sodium silicate nonahydrate, control the carbonization temperature at 18°C, and inject CO from the bottom 2 / N 2 Mixed gas (60 / 120m 3 h -1 m -3 Suspension), for carbonization, 8 minutes after the start of the carbonization reaction, add 1.3% PEG-800 and 15% silica sol solution (the SiO 2 The average particle size is 5-10nm), and finally carbonized to pH=6.8 to obtain the composite particle slurry;

[0042] (3) Heat the slurry water bath in step (2) to 85°C, and pass a small amount of CO in the process 2 / N 2 The mixed gas keeps the pH=7.0, completely carbonizes the coated...

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Abstract

The invention discloses a preparation method and dispersing method of a nano CaCO3 / SiO2 composite particle, and belongs to the technical field of polymer materials. At first, a calcium hydroxide turbid liquid is prepared from quicklime and then is aged and dispersed; a crystal form controller is added, mixed gas of CO2 and N2 is introduced into the solution to carry out carbonization; a dispersant (A) and a silica sol solution are added, then the composite particle slurry is heated in a water bath, then the slurry is grinded in a cyclic sand mill, before grinding or during the grinding process, a dispersant (B) is added, and after 10 to 30 minutes of grinding, uniform and stable nano calcium carbonate slurry is obtained. The provided nano CaCO3 / SiO2 composite particle has the characteristics of simple technology, low energy consumption, and low cost, is easy to disperse, and can form stable nano slurry.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a nano-CaCO 3 / SiO 2 Preparation method and dispersion method of composite particles. Background technique [0002] Nano-silica is one of the nano-materials with hydroxyl groups on the surface. It is a nano-powder material with the highest large-scale industrial production in the world. It is widely used in polymer composite materials, plastics, coatings, rubber, pigments, ceramics , Adhesives, FRP and antibacterial materials and other fields. Nano-silica has strong ultraviolet and infrared reflection characteristics. When added to the coating, it can form a shielding effect on the coating, achieve the purpose of anti-ultraviolet aging and heat aging, and increase the heat insulation of the coating. At the same time, nano-silica has a three-dimensional network structure, which can form a network structure when the paint is dry, while increasing the strength, adhesion...

Claims

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Application Information

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IPC IPC(8): C01F11/18
CPCC01F11/181C01P2004/04C01P2004/51C01P2004/62C01P2004/80
Inventor 庞起刘旭杨昊郭豪韩行健
Owner GUANGXI UNIV
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