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Preparation of calcium carbonate complex particle

A technology of composite particles and calcium carbonate, which is applied in chemical instruments and methods, inorganic pigment treatment, fibrous fillers, etc., can solve the problems of insufficient coating of calcium carbonate surface, difficult calcium carbonate particles, long processing time, etc. Improvement, simple operating conditions, and the effect of lowering the pH value

Inactive Publication Date: 2009-01-28
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, the method of directly reacting sodium silicate and acid to generate precipitation is affected by the acid, and SiO 2 Gelation is too fast, it will nucleate itself and produce SiO 2 particles, the calcium carbonate particles are mixed with SiO 2 particles; if gelling is too slow, SiO 2 It is difficult to form a film on the surface of calcium carbonate particles, and the surface coating of calcium carbonate is not tight
The method of forming sol-gel by hydrolysis of silicate has disadvantages such as long processing time, difficult filtration and drying of precipitates, and the need for a large amount of organic solvents.

Method used

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  • Preparation of calcium carbonate complex particle
  • Preparation of calcium carbonate complex particle
  • Preparation of calcium carbonate complex particle

Examples

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Embodiment 1

[0023] This embodiment provides a preparation method for synthesizing calcium carbonate composite particles, which can prepare a calcium carbonate particle with strong acid resistance, such as figure 1 As shown, the specific preparation method is as follows:

[0024] In the calcium carbonate slurry with a concentration of 5% to 20%, add water glass solution, and SiO in the added water glass solution 2 and the CaCO in the calcium carbonate slurry 3 The mass ratio of the calcium carbonate slurry is 5 to 25%, and a dispersing aid can also be added to the calcium carbonate slurry at the same time. The amount of the dispersing aid added is 0.1 to 3% of the weight of the calcium carbonate slurry, and the mixed slurry is heated to 80-80%. 90°C, under the state of vigorous stirring (generally refers to the stirring state of the stirring device reaching 1000 rpm to 1500 rpm) for 1 to 1.5 hours, after the reaction, add a pH regulator to adjust the pH value of the slurry to 8 to 10 , k...

Embodiment 2

[0028] The present embodiment provides a kind of preparation method of calcium carbonate composite particle, can prepare the calcium carbonate particle with strong acid resistance, this calcium carbonate composite particle can be used in a wider range, and specific preparation process is as follows:

[0029] In the calcium carbonate slurry that the concentration is 15%, add water glass solution, add the consumption of water glass solution with the SiO in water glass solution 2 with the CaCO in the calcium carbonate slurry 3 The mass ratio of the mixture is 15%, the mixed slurry is heated to 85°C, and under vigorous stirring (generally refers to stirring at a state of 1000 rpm to 1500 rpm), use ethyl acetate as a pH regulator Adjust the pH value of the slurry to 8.5, age at 85°C for 3 hours, wash and filter, and dry at 130°C after washing for 60 minutes. After drying, crush to obtain calcium carbonate composite particle.

Embodiment 3

[0031] This embodiment provides a preparation method of calcium carbonate composite particles, which can well prepare calcium carbonate particles with strong acid resistance. The specific preparation process is as follows:

[0032] In the calcium carbonate slurry that the concentration is 20%, add water glass solution, add the consumption of water glass solution with the SiO in water glass solution 2 with the CaCO in the calcium carbonate slurry 3 The mass ratio is 5%, the mixed slurry is heated to 80 ° C, under vigorous stirring, the addition of CO as a pH regulator 2 Adjust the pH value of the slurry to 9-10, age at a constant temperature of 80°C for 3 hours, wash and filter, dry at 130°C for 50 minutes after washing, and pulverize after drying to obtain calcium carbonate composite particles.

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Abstract

The invention discloses a preparation method of calcium carbonate composite particles, comprising the following steps: water glass is added in calcium carbonate pulp with the consistency of 5 percent to 20 percent for mixing; the mixed pulp is heated to 80 to 90 DEG C; reaction is conducted under the stirring condition of 1000r / min to 1500r / min; the reaction time is 0.5 to 1 hour; a PH regulator is added to regulate the PH of the pulp to be 7 to 11; aging is conducted at the temperature of 80 to 90 DEG C after reaction and the aging time is 2 to 5 hours; drying is conducted after aging at the temperature of 120 to 140 DEG C; and the calcium carbonate composite particle is obtained when breaking after drying. The method adopts the PH regulator to better control the PH value change of the solution, can effectively control the SiO2 membrane forming rate to make the SiO2 evenly form membrane on the surface of the calcium carbonate. Water glass is hydrolyzed to form tightly bound hydrated silica layer on the surface of calcium carbonate, having the advantages of simple operation condition, compact structure of made calcium carbonate composite particle and strong acid resistance.

Description

technical field [0001] The invention relates to a preparation technology of calcium carbonate particles, in particular to a preparation method of calcium carbonate composite particles which can be widely used in various industries as inorganic fillers and the like. Background technique [0002] Calcium carbonate has the characteristics of easy source of raw materials, low price, low toxicity, high whiteness, large filling capacity and good mixing and processing performance. It is widely used in rubber, paint, papermaking, plastics and other industries. It is an important inorganic filler. However, the surface of calcium carbonate has a strong polarity. When it is applied to those low-polarity polymers, surface modification is required to improve the filler-filler and filler-polymer effects, which is beneficial to the calcium carbonate in the polymer matrix. scattered. When commonly used reactive coupling agents, such as silane coupling agents and titanate coupling agents, ...

Claims

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Application Information

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IPC IPC(8): C09C1/02C09C3/06
Inventor 罗穗莲石光潘慧铭王跃林刘莉吴利民陈义唐
Owner SOUTH CHINA NORMAL UNIVERSITY
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