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Preparation method of light calcium carbonate for carbon-free copying paper

A light calcium carbonate, carbon-free copy paper technology, applied in the direction of calcium carbonate/strontium/barium, inorganic compound addition, etc., can solve the problems of low smoothness, slow color development speed, etc.

Active Publication Date: 2009-07-08
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 patent, when the obtained calcium carbonate is used for carbonless copy paper coating, generally has the defects of low smoothness or / and slow color development speed, which needs to be improved

Method used

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  • Preparation method of light calcium carbonate for carbon-free copying paper
  • Preparation method of light calcium carbonate for carbon-free copying paper

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Ultrafine precipitation silica slurry:

[0028] Weigh 200kg of precipitated silica, add 300kg of water into a 1 cubic meter reactor, add 200kg of precipitated silica into a stirred 1 cubic meter reactor, and then add 2kg of dodecyl phosphate mixed ester sodium salt dispersant , the molar ratio of dodecyl phosphate monoester to dodecyl diester phosphate is 1:1, and the silicon oxide slurry is prepared, stirred, and then 80 liters of wet-type ultra-fine peeling machine is used to carry out the precipitation method silicon oxide slurry ultra fine grind. A silicon oxide slurry is prepared, wherein the weight content of particles with a particle size less than 2 μm is 70%.

[0029] The calcium hydroxide slurry that 8000kg solid content is 15% joins in the carbonization tower of 12 cubic meters, adds above-mentioned superfine precipitation method silicon oxide slurry 300kg in the carbonization tower, passes into the carbonation tower containing carbon dioxide 27% ( volume) ...

Embodiment 2

[0031] Ultrafine precipitation silica slurry:

[0032] Weigh 100kg of precipitated silica, add 1900kg of water into a 3 cubic meter reactor, add 100kg of precipitated silica into a stirred 3 cubic meter reactor, and then add 3kg of dodecyl phosphate mixed ester sodium salt dispersant , the molar ratio of dodecyl phosphate monoester to dodecyl diester is 1:0.5, and the precipitated silicon oxide slurry is prepared. Stir, and then use an 80-liter wet ultrafine sand mill to ultrafinely grind the precipitated silicon oxide slurry. An ultra-fine precipitation silicon oxide slurry is prepared, wherein the weight content of particles with a particle size less than 2 μm is 100%.

[0033] The calcium hydroxide slurry that 8000kg solid content is 9% joins in the carbonization tower of 12 cubic meters, adds above-mentioned superfine precipitation method silicon oxide slurry 720kg in the carbonization tower, passes into carbon dioxide 28% ( volume) mixed gas, carbonized to pH 6.8 to obt...

Embodiment 3

[0035] Ultrafine precipitation silica slurry:

[0036] Weigh 500kg of precipitated silica, add 2000kg of water into a 3 cubic meter reactor, add 500kg of precipitated silica into a stirred 3 cubic meter reactor, and then add 0.5kg of cetyl phosphate mixed ester sodium salt Powder, the molar ratio of cetyl phosphate monoester to cetyl phosphate diester is 1:1.2, and the precipitated silicon oxide slurry is prepared. Stir, and then use an 80-liter wet ultrafine sand mill to ultrafinely grind the precipitated silicon oxide slurry. An ultra-fine precipitation silicon oxide slurry is prepared, wherein the weight content of particles with a particle size less than 2 μm is 70%.

[0037] The calcium hydroxide slurry that 6000kg solid content is 10% joins in the carbonization tower of 12 cubic meters, adds above-mentioned superfine precipitation method silicon oxide slurry 2000kg in the carbonization tower, passes into carbon dioxide 34% ( volume) mixed gas, carbonized to pH 6.9 to o...

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Abstract

The invention discloses a preparation method of light calcium carbonate for carbonless copy paper, which comprises the following steps: (1) adding a dispersant to a silicon oxide slurry, and then feeding it into a grinder for grinding; the dispersant is phosphoric acid The mixture of monoester salt and phosphoric acid diester salt; (2) the product of step (1) is added in the calcium hydroxide slurry, feeds carbon dioxide gas carbonization to pH and is 6.5~7.5, obtains light calcium carbonate slurry, Light calcium carbonate is then collected from said light calcium carbonate slurry. The light calcium carbonate prepared by the method of the invention is used for carbonless copy paper coating, and can make the color development speed of the carbonless copy paper fast.

Description

technical field [0001] The invention relates to a preparation method of light calcium carbonate, in particular to a preparation method of light calcium carbonate used for high color development speed carbonless copy paper. 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 calc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F11/18D21H17/66D21H19/44
Inventor 施晓旦王彦华
Owner SHANGHAI DONGSHENG NEW MATERIALS
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