Cubic CaCO3 and SiO2 composite particles and preparing method thereof

A composite particle and cube-shaped technology, applied in the direction of silica, calcium carbonate/strontium/barium, nanotechnology, etc., can solve problems such as complex operation, different crystal forms, and uneven particle size

Inactive Publication Date: 2016-03-23
GUANGXI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the operation process of this method is divided into two steps, which is more complicated, and the finished product contains CaCO 3 Particle and Nano SiO 2 Particles and other non-target products
[0005] 2. Liu Runjing and others [3] , Jiang Xiaoyi, etc. [4] and Liu Guojun et al. [5] Use self-made calcium carbonate and 40-60nm finished calcium carbonate as raw materials respectively, add sodium silicate, and use H at 80-85°C 2 SO 4 Adjust pH=5-9, age for 2-4h, filter, wash and dry to obtain CaCO 3 / SiO 2 Composite particles, but the composite particles prepared by this method mostly exist in spherical or other irregular shapes, and the particle size is uneven, and SO 4 2- Impurities
[0006] 3. Ma Cuicui, etc. [6] , Hua Yimiao, etc. [7] He Shiqi and others [8] Using self-made 50-70nm calcium carbonate and 70nm finished calcium carbonate as raw materials, add sodium silicate dropwise at 80-90°C, and simultaneously introduce CO 2 To keep the pH of the system = 8-9, age for 2-4 hours at last, wash, filter and dry to obtain 60-80nm CaCO 3 / SiO 2 Composite particles, but the method is divided into two steps, the operation is complicated, the obtained composite particles are uneven in size, different in crystal form, and more Na is introduced in the modification process. +

Method used

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  • Cubic CaCO3 and SiO2 composite particles and preparing method thereof
  • Cubic CaCO3 and SiO2 composite particles and preparing method thereof
  • Cubic CaCO3 and SiO2 composite particles and preparing method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Put 8.74g of quicklime into 280g of water at 80°C, and digest it in a dispersion plate at a speed of 1000rpm for 2h; pass the obtained calcium hydroxide suspension through a 200-mesh standard sieve, and then add water to make a suspension with a mass fraction of 4wt%. , aged for 24 hours, and set aside;

[0032] the calcium hydroxide suspension in the step is dispersed in a dispersing disk with a rotating speed of 1000rpm in a linear cut, and 0.52g of 30% sulfuric acid solution is added to control the carbonization temperature to be 15°C, and a certain flow rate ( 60 / 120m 3 .h -1 .m -3 Suspension) CO 2 and N 2 The mixed gas is carbonized; after starting the carbonization reaction for 5min, add 1.04g30% PEG-600 and 15.60g20% silica sol solution (its SiO 2 The average particle size is 5-10nm, the pH is 9.0-10.5), and finally carbonized to pH = 7.0 to obtain the nanocomposite particle slurry;

[0033] Heat the slurry water bath in step to 80°C, and pass a small am...

Embodiment 2

[0036] Put 13.32g of quicklime into 280g of water at 80°C, and digest it in a dispersion plate at a speed of 1000rpm for 2h; pass the obtained calcium hydroxide suspension through a 200-mesh standard sieve, and then add water to make a suspension with a mass fraction of 6wt%. , aged for 24 hours, and set aside;

[0037] the calcium hydroxide suspension in the step is dispersed in a dispersing disk with a rotating speed of 1000rpm in a linear cut, and 0.63g of 30% sulfuric acid solution is added to control the carbonization temperature to be 14°C, and a certain flow rate ( 60 / 120m 3 .h -1 .m -3 Suspension) CO 2 and N 2 The mixed gas is carbonized; after starting the carbonization reaction for 5min, add 1.19g30% PEG-1000 and 17.83g20% silica sol solution (its SiO 2 The average particle size is 10-20nm, the pH is 9.0-10.5), and finally carbonized to pH = 7.0 to obtain the nanocomposite particle slurry;

[0038] Heat the slurry water bath in step to 80°C, and pass a small...

Embodiment 3

[0041] Put 32.21g of quicklime into 280g of water at 80°C, and digest it in a dispersion plate at a speed of 1000rpm for 2h; pass the obtained calcium hydroxide suspension through a 200-mesh standard sieve, and then add water to make a suspension with a mass fraction of 8wt%. , aged for 24 hours, and set aside;

[0042] the calcium hydroxide suspension in the step is dispersed in a dispersing disk with a rotating speed of 1000rpm in a linear cut, and 0.64g of 30% sulfuric acid solution is added to control the carbonization temperature to be 11°C, and a certain flow rate ( 60 / 120m 3 .h -1 .m -3 Suspension) CO 2 and N 2 The mixed gas is carbonized; after starting the carbonization reaction for 5min, add 1.07g30% PEG-600 and 16.11g10% silica sol solution (its SiO 2 The average particle size is 5-10nm, the pH is 9.0-10.5), and finally carbonized to pH = 6.7 to obtain the nanocomposite particle slurry;

[0043] Heat the slurry water bath in step to 80°C, and pass a small a...

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Abstract

The invention discloses a preparing method for cubic CaCO3 and SiO2 composite particles. The preparing method includes the steps that nano calcium carbonate prepared through a carbonization method is used as a raw material, while calcium hydroxide is carbonized into calcium carbonate, surface modification is carried out by using sulfuric acid as a crystal form control agent, polyethylene glycol as a dispersing agent and silica sol as a surface modifier, the surface of calcium carbonate is coated with nano silica sol, and the cubic CaCO3 and SiO2 composite particles are prepared through one step. Compared with a traditional method, the preparing method adopts the one-step method and has the advantages of being short in time, high in efficiency, easy to operate, low in cost and the like. The obtained cubic CaCO3 and SiO2 composite particle product is uniform in size and crystal form, pure and free of impurities and is coated completely.

Description

technical field [0001] The invention belongs to the technical field of silicon dioxide modified nano-calcium carbonate, in particular to a cubic CaCO 3 SiO 2 Composite particles and methods for their preparation. Background technique [0002] Calcium carbonate is an important inorganic material. With the development of nanotechnology, the emerging nano-calcium carbonate has been used as a more excellent inorganic filler, widely used in rubber, plastics, paper, advanced inks, coatings, medicine, Food, cosmetics and other fields. Compared with other fillers, calcium carbonate has obvious advantages in terms of whitening, reinforcement, and replacement to reduce the total cost of polymers. At the same time, the source of calcium carbonate raw materials is wide, the preparation process is easy to control, and the cost is low. According to data, the current usage of calcium carbonate as a polymer filler is as high as 80%. In industry, the carbonization method is often the mai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18C01B33/12B82Y30/00
Inventor 庞起刘旭郭豪韩行健杨昊
Owner GUANGXI UNIV
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