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

A technology of light calcium carbonate and carbon-free copy paper, applied in calcium carbonate/strontium/barium, papermaking, paper coating, etc., which can solve problems such as low smoothness and slow color development speed

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 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

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 and dodecyl phosphate diester is 1: 1, prepare silicon oxide slurry, stir, then adopt 80 liters of wet-type ultra-fine strippers, carry out 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) mixed gas, carbonized to pH 7.1...

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 phosphate is 1:0.5, and a precipitation 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...

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 and cetyl phosphate diester is 1:1.2, and the precipitation method 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...

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Abstract

The invention discloses a preparation method of light calcium carbonate for carbonless copy papers, comprising the steps that: 1. dispersant is added in silicon oxide slurry and then is sent into a grinder to be grinded; the dispersant is the mixture of phosphoric acid monoester salt and phosphoric acid diester salt; 2. the products in step 1 is put into calcium hydroxide slurry, is carbonized through carbon dioxide gas until pH is between 6.5-7.5 to get light calcium carbonate slurry, and then the light calcium carbonate is collected from the light calcium carbonate slurry. The light calcium carbonate produced by the invention can be applied to carbonless copy paper coating, which results in high coloring speed of the carbonless copy papers.

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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IPC IPC(8): C01F11/18D21H17/66D21H19/44
Inventor 施晓旦王彦华
Owner SHANGHAI DONGSHENG NEW MATERIALS
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