Kaolin composite material and preparation method thereof

A technology of composite materials and kaolin, applied in chemical instruments and methods, fibrous fillers, inorganic pigment treatment, etc., can solve the problems of poor opacity of paper sheets, low whiteness of coated surfaces, low whiteness, etc., and achieve improved sealing , High whiteness, the effect of improving whiteness

Inactive Publication Date: 2012-06-20
GUANGDONG IND TECHN COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the gaps formed between the kaolin flakes are smaller than the size required for optimal light scattering, the paper is poor in opacity; at the same time, it can also cause "closed" coating (that is, the coated surface is relatively tight), causing the paper to be damaged during printing. When it is used, it will cause "bubble" phenomenon in the drying device of the printing machine and cause trouble; in addition, due to its low whiteness, the whiteness of the coated surface is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Add 1500g of kaolin particles with a particle size of less than 2μm and a mass content of not less than 95% to 4000g of a calcium hydroxide solution with a mass percent concentration of 15%, and disperse to form a suspension; control the temperature of the suspension at 10-12°C Then, 5 g of sodium tripolyphosphate was added to the suspension, and carbon dioxide was introduced at the same time, and the carbonization reaction was carried out at a stirring speed of 2500 rpm; when it was detected that the pH value of the suspension reached 8, the carbon dioxide was stopped to terminate the reaction. Then the suspension is filtered, dried and dispersed to obtain the kaolin composite material coated with nanometer calcium carbonate. The whiteness index of the composite material (ISO) is 2% higher than that before coating, and the specific surface area (m 2 / g) index increased by 20% than before coating.

Embodiment 2

[0022] Add 1,500 g of kaolin particles with a particle size of less than 2 μm and a mass content of not less than 96% to 4,000 g of a calcium hydroxide solution with a mass percent concentration of 17%, and disperse to form a suspension; control the temperature of the suspension between 12 and 15°C Then, 10 g of potassium tripolyphosphate was added to the suspension, and carbon dioxide was introduced at the same time, and the carbonization reaction was carried out at a stirring speed of 2800 rpm; when the pH value of the suspension was detected to reach 7.8, the carbon dioxide was stopped to terminate the reaction. Then the suspension is filtered, dried and dispersed to obtain the kaolin composite material coated with nanometer calcium carbonate. The whiteness index of the composite material (ISO) is 3% higher than that before coating, and the specific surface area (m 2 / g) index increased by 25% than before coating.

Embodiment 3

[0024] Add 1500g of kaolin particles with a particle size of less than 2μm and a mass content of not less than 90% to 4000g of a calcium hydroxide solution with a mass percent concentration of 20%, and disperse to form a suspension; control the temperature of the suspension at 8-10°C Then, 12g of sodium pentapolyphosphate was added to the suspension, and carbon dioxide was introduced at the same time, and the carbonization reaction was carried out at a stirring speed of 2000rpm; when the pH value of the suspension was detected to reach 8.2, the carbon dioxide was stopped and the reaction was terminated. Then the suspension is filtered, dried and dispersed to obtain the kaolin composite material coated with nanometer calcium carbonate. The whiteness index of the composite material (ISO) is 3.5% higher than that before coating, and the specific surface area (m 2 / g) index increased by 28% compared with that before coating.

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Abstract

The invention discloses a kaolin composite material and a preparation method thereof. The preparation method of the kaolin composite material comprises the following steps: adding kaolin into calcium hydroxide solution, and dispersing to form a suspension; controlling the temperature of the suspension at 3-60 DEG C, adding an additive into the suspension, introducing carbon dioxide, and stirring at the temperature to carry out carbonation reaction; stopping introducing the carbon dioxide when the pH value of the suspension reaches 7.8-8.2, stopping reaction, filtering the suspension, drying and dispersing to obtain the kaolin composite material coated by nano calcium carbonate. The kaolin composite material disclosed by the invention is white, has an open surface and can be used for producing the coating pigment for paper making to obtain the high-whiteness and high-bulk coating layer.

Description

technical field [0001] The invention belongs to the technical field of composite material preparation, in particular to a composite material coated with nano-calcium carbonate and a preparation method thereof. Background technique [0002] As a coating pigment for papermaking, kaolin has good running performance, good coverage at very low coating weight, and high printing gloss. However, since the gaps formed between the kaolin flakes are smaller than the size required for optimal light scattering, the paper is poor in opacity; at the same time, it can also cause "closed" coating (that is, the coated surface is relatively tight), causing the paper to be damaged during printing. Sometimes, the "bubble" phenomenon occurs in the drying device of the printing machine and causes trouble; in addition, due to its low whiteness, the whiteness of the coated surface is low. Contents of the invention [0003] In order to solve the shortcomings and deficiencies of the above-mentioned...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/42C09C3/06D21H19/40
Inventor 郭纬张赣霞林润惠李汝基
Owner GUANGDONG IND TECHN COLLEGE
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