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Preparation of calcium carbonate for carbon-free copying paper paint

A carbonless copy paper, calcium carbonate technology, applied in the direction of calcium carbonate/strontium/barium, pigment-containing coatings, etc., can solve the problems of slow color development and low smoothness

Inactive Publication Date: 2008-01-30
SHANGHAI DONGSHENG NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technology disclosed in the above-mentioned patent needs to be improved due to the common defects of low smoothness or / and slow color development when the obtained calcium carbonate is used for carbonless copy paper coating

Method used

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  • Preparation of calcium carbonate for carbon-free copying paper paint
  • Preparation of calcium carbonate for carbon-free copying paper paint

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Weigh 40kg of aluminum sulfate, add 200kg of water into a 1 cubic meter reactor, and add 40kg of aluminum sulfate into a stirred 1 cubic meter reactor to make an aluminum sulfate solution.

[0021] Add 8000kg of calcium hydroxide slurry with a solid content of 20% into a carbonization tower with a stirring and cooling water jacket of 12 cubic meters, add 165 kg of the above-mentioned aluminum sulfate solution to the carbonization tower, stir for 20 minutes, and pour into the carbonization tower Feed in a mixed gas containing 10% (volume) of carbon dioxide, and use cooling water to control the temperature of the calcium hydroxide slurry at 10°C. When the carbonization to pH is 7.3, calcium carbonate slurry is obtained for carbonless copy paper coating, and the calcium carbonate slurry is filtered and washed with a plate and frame filter press to obtain a carbonless copy paper coating calcium carbonate product with a solid content of 50% filter cake 4260kg.

Embodiment 2

[0023] Weigh 30 kg of aluminum chloride, add 200 kg of water into a 1 cubic meter reactor, and add 30 kg of aluminum chloride into a stirred 1 cubic meter reactor to prepare an aluminum chloride solution.

[0024] 8000kg of calcium hydroxide slurry with a solid content of 5% is added to a carbonization tower with a stirring and cooling water jacket of 12 cubic meters, and 150 kg of the above-mentioned aluminum chloride solution is added to the carbonization tower, stirred for 50 minutes, and poured into the carbonization tower Pass into the mixed gas containing carbon dioxide 35% (volume), and control the temperature of the calcium hydroxide slurry at 40° C. with cooling water. When the carbonization to pH is 7.1, the calcium carbonate slurry for carbonless copy paper coating is obtained, and the calcium carbonate slurry is filtered and washed with a plate and frame filter press to obtain a carbonless copy paper coating calcium carbonate product with a solid content of 50% filt...

Embodiment 3

[0026] Weigh 100 kg of aluminum nitrate, add 350 kg of water to a 1 cubic meter reactor, and add 100 kg of aluminum nitrate to a stirred 1 cubic meter reactor to prepare an aluminum nitrate solution.

[0027] Add 8000kg of calcium hydroxide slurry with a solid content of 15% into a carbonization tower with a stirring and cooling water jacket of 12 cubic meters, add 250 kg of the above-mentioned aluminum nitrate solution to the carbonization tower, stir for 2 hours, and pour into the carbonization tower Feed in a mixed gas containing 18% (volume) of carbon dioxide, and control the temperature of the calcium hydroxide slurry at 20° C. with cooling water. When the carbonization to pH is 7.2, calcium carbonate slurry is obtained for carbonless copy paper coating, and the calcium carbonate slurry is filtered and washed with a plate and frame filter press to obtain a carbonless copy paper coating calcium carbonate product with a solid content of 51% filter cake 2980kg.

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Abstract

The invention provides a preparation method of calcium carbonate for carbonless copy paper coating, comprising the steps that: soluble aluminum salt aqueous solution is added in calcium hydroxide slurry, then the calcium hydroxide slurry is carbonize through carbon dioxide gas until pH is between 6.5-7.5 to get calcium carbonate slurry for carbonless copy paper coating, and then calcium carbonate is collected for carbonless copy paper coating from the calcium carbonate slurry. Detection results show that the calcium carbonate for carbonless copy paper coating produced by the method can be applied to producing the carbonless copy paper coating, which results in high smoothness of carbonless copy paper and high coloring speed.

Description

technical field [0001] The invention relates to a preparation method of calcium carbonate for carbonless copy paper coating. Background technique [0002] Carbonless copy paper is a kind of special paper that develops color by contacting the colorless dye coated on the paper with the developer. It is mainly composed of three layers: upper paper (CB), the back of which is coated with non- Microcapsules of colorless dyes in volatile solvents; middle paper (CF / CB), the front of this layer of paper is coated with a developer coating, and the back is coated with microcapsules; bottom paper (CF), this layer of paper Apply developer to the front side only. The principle of color development is that when pressure is applied to the upper paper, the microcapsules coated on the back of the paper burst and react with the color developer on the front of the paper to develop color. The calcium carbonate for carbonless copy paper coating prepared by this technology is applied to the CF c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18D21H19/36
Inventor 施晓旦王彦华
Owner SHANGHAI DONGSHENG NEW MATERIALS
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