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Method for covering nano calcium carbonate on heavy mass calcium carbonate surface

A technology of nano-calcium carbonate and heavy calcium carbonate, applied in chemical instruments and methods, inorganic pigment treatment, fibrous fillers, etc., can solve problems affecting fiber bonding, reducing paper strength, reducing sizing efficiency, etc.

Inactive Publication Date: 2005-06-29
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the specific surface area of ​​light calcium carbonate particles is large, which reduces the sizing efficiency; there are small gaps between the particles that affect the bonding between fibers, thereby reducing the strength of the paper sheet; light calcium carbonate is more resistant than heavy calcium carbonate. More moisture is retained, which means lower machine speeds: when loadings of light calcium carbonate exceed 15%, a lot of productivity problems arise

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0011] Adopt 2000g mechanical pulverization ground calcium carbonate particle, average particle diameter 5 μm. Add 5000ml, 8% calcium hydroxide solution, the stirring speed is 2500rpm, then add 5g organic polyphosphate additive, the solution temperature is controlled at 10 ℃. Then pass into carbon dioxide, and its mass fraction is 30%, stops aerating when pH value reaches 8. Then filter, dry and disperse to obtain nano calcium carbonate-heavy calcium carbonate composite particles, the average particle diameter of nano calcium carbonate is 40nm.

example 2

[0013] Adopt 2000g mechanical pulverization ground calcium carbonate particle, average particle diameter 10 μm. Add 5000ml, 15% calcium hydroxide solution, the stirring speed is 2400rpm, then add 10g organic polyphosphate additive, the solution temperature is controlled at 25 ℃. Then pass into carbon dioxide, its mass fraction is 50%, stop aeration when pH value reaches 8. Then filter, dry and disperse to obtain nano calcium carbonate-heavy calcium carbonate composite particles, the average particle diameter of nano calcium carbonate is 50nm.

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PUM

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Abstract

The invention is a new method for preparing nano calcium carbonate-heavy calcium carbonate composite nano material. The method combines the advantages of the physical method and the chemical method for preparing particles, and deposits nanometer calcium carbonate particles on the surface of the heavy calcium carbonate prepared by the physical method by chemical method, so as to prepare composite nanometer calcium carbonate-heavy calcium carbonate particles. This kind of composite particles not only preserves the shape of heavy calcium carbonate particles, but also can maintain a large amount of fillers to reduce costs, and at the same time, its surface is modified by nanometer light calcium carbonate, which has lower strength and thus reduces wear. Moreover, the surface of the heavy calcium carbonate is coated with nano light calcium carbonate and used as a filler in applications with high whiteness and good dispersibility. Therefore, this composite particle is a new type of material with great application prospects in papermaking, plastics, rubber, coatings and other fields.

Description

technical field [0001] The invention is a new method for preparing nanometer calcium carbonate-heavy calcium carbonate composite nanometer material. Background technique [0002] There are two main methods of particle preparation: physical and chemical. Particles prepared by physical or mechanical methods have low cost and large average particle size; particles prepared by chemical methods have high cost and small particle size. The heavy calcium carbonate prepared by physical method allows a higher filling amount, which can improve economic benefits; the shape of the particles is conducive to the combination of fibers and the strength of the paper sheet: the runnability of the paper machine is better, because the resistance It retains less water and has better drainage; it has less impact on sizing. However, the whiteness and opacity are lower than the light calcium carbonate with the same amount of filling; the slurry-like heavy calcium carbonate needs to be added with a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09C3/06
Inventor 盖国胜刘利人樊世民
Owner TSINGHUA UNIV