Preparation and application of calcium carbonate for carbon-free copying paper paint

A carbonless copy paper and calcium carbonate technology, applied in calcium carbonate/strontium/barium, papermaking, pigmented coatings, etc., can solve problems such as low smoothness and slow color development

Active 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

[0011] 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 and application of calcium carbonate for carbon-free copying paper paint
  • Preparation and application of calcium carbonate for carbon-free copying paper paint
  • Preparation and application of calcium carbonate for carbon-free copying paper paint

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Preparation of Zirconium Hydroxide Seed Crystals:

[0025] Weigh 355kg zirconium sulfate tetrahydrate, add 1000kg water in a 3 cubic meter reactor, and add 355kg zirconium sulfate tetrahydrate into a stirred 3 cubic meter reactor to make a zirconium sulfate solution.

[0026] Take by weighing 160kg solid sodium hydroxide, add 1000kg water in the reactor of 2 cubic meters, 160kg solid sodium hydroxide is joined in the reactor of stirring 2 cubic meters, make sodium hydroxide solution. The sodium hydroxide solution was added to the constantly stirring zirconium sulfate solution, the flow rate of the sodium hydroxide solution was adjusted so that the addition time was controlled at 5 hours, and 2515 kg of zirconium hydroxide seed crystal slurry was obtained.

[0027] The calcium hydroxide slurry that 8000kg solid content is 10% joins in the carbonization tower of 12 cubic meters, adds above-mentioned zirconium hydroxide seed slurry 2100kg in the carbonization tower, passes...

Embodiment 2

[0029] Preparation of Zirconium Hydroxide Seed Crystals:

[0030] Weigh 170kg of zirconium nitrate, add 2000kg of water in a 3 cubic meter reactor, and add 170kg of zirconium nitrate into a stirred 3 cubic meter reactor to make a zirconium nitrate solution. Take by weighing 112kg solid potassium hydroxide, add 1000kg water in the reactor of 2 cubic meters, 112kg solid potassium hydroxide is joined in the reactor of stirring 2 cubic meters, make potassium hydroxide solution. The potassium hydroxide solution was added to the constantly stirring zirconium nitrate solution, the flow rate of the potassium hydroxide solution was adjusted so that the addition time was controlled at 3 hours, and 3282 kg of zirconium hydroxide seed crystal slurry was obtained.

[0031] The calcium hydroxide slurry that 8000kg solid content is 25% joins in the carbonization tower of 12 cubic meters, adds above-mentioned zirconium hydroxide seed crystal slurry 2100kg in the carbonization tower, passes in...

Embodiment 3

[0033] Preparation of Zirconium Hydroxide Seed Crystals:

[0034] Take by weighing 203kg zirconyl sulfate, add 500kg water in the reactor of 2 cubic meters, join 203kg zirconyl sulfate in the reactor of stirring 2 cubic meters, make zirconyl sulfate solution. Take by weighing 400kg content and be 40% liquid caustic soda, add 500kg water in the reactor of 1 cubic meter, be that 40% liquid caustic soda is joined in the reactor of stirring 1 cubic meter by 64kg content, make caustic soda solution. The caustic soda solution was added to the constantly stirring zirconyl sulfate solution, and the flow rate of the caustic soda solution was adjusted so that the adding time was controlled at 2 hours to obtain 1603 kg of zirconium hydroxide seed crystal slurry.

[0035] The calcium hydroxide slurry that 8000kg solid content is 8% joins in the carbonization tower of 12 cubic meters, adds above-mentioned zirconium hydroxide seed slurry 1300kg in the carbonization tower, passes into carbon...

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Abstract

The invention discloses a calcium carbonate for carbonless copy paper coating as well as the preparation and application thereof and the preparation method comprises the steps that: 1. the preparation of crystal seed zirconium hydroxide: alkaline material aqueous solution in zirconium salt aqueous solution is added to produce crystal seed zirconium hydroxide slurry; 2. the crystal seed zirconium hydroxide slurry is added into calcium hydroxide slurry, carbonized 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 for carbonless copy paper coating is collected. The calcium carbonate for carbonless copy paper coating can be applied to 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 the preparation and application 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18D21H19/36D21H21/14
Inventor 施晓旦王彦华
Owner SHANGHAI DONGSHENG NEW MATERIALS
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