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Grinding calcium carbonate suspension production process, grinding calcium carbonate suspension and paper

A technology of grinding calcium carbonate and production process, applied in paper, papermaking, special paper and other directions, can solve the problems of skin and respiratory tract irritation, flammability, strong acrylic acid irritation, etc. Effect

Active Publication Date: 2016-08-10
GOLD EAST PAPER JIANGSU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, polyacrylic acid and its salts are polymer synthetic products, and its synthetic monomer acrylic acid is highly irritating and flammable, and it is more serious to human skin and respiratory irritation.

Method used

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  • Grinding calcium carbonate suspension production process, grinding calcium carbonate suspension and paper

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Under stirring condition, add 505g water in the GCC dry powder of 1kg, afterwards, add the nanocellulose solution that 100g carboxyl content is 1.4mmol / g, wherein, nanocellulose effective concentration is 0.5% (that is 0.5g carboxyl content is 1.4mmol / g of nanocellulose), stirred for 5 minutes to obtain a mixed solution; utilize a GCC grinder (WAB DYNO-Mill) to grind and disperse the mixed solution for 12 minutes, and measure the GCC average particle size after grinding to be 1.54 μm; The ground GCC is mixed with papermaking pulp, wherein the GCC filling amount is 20% (for absolute dry fiber), and after the pulp and GCC are evenly mixed, 1% cationic starch (for absolute dry pulp) is added, and then paper is made and tested Paper performance, see the following table for specific performance parameters.

Embodiment 2

[0039] Under stirring condition, in the GCC dry powder of 1kg, add 305g water, afterwards, add the nanocellulose solution that 300g carboxyl content is 1.4mmol / g, wherein, nanocellulose effective concentration is 0.5% (that is 1.5g carboxyl content is 1.4mmol / g of nanocellulose), stirred for 5 minutes to obtain a mixed solution; the mixed solution was ground and dispersed for 12 minutes using a GCC grinder (WAB DYNO-Mill), and the GCC average particle size was determined to be 1.46 μm after grinding; The ground GCC is mixed with papermaking pulp, wherein the GCC filling amount is 20% (for absolute dry fiber), and after the pulp and GCC are evenly mixed, 1% cationic starch (for absolute dry pulp) is added, and then paper is made and tested Paper performance, see the following table for specific performance parameters.

Embodiment 3

[0041] Under stirring condition, in the GCC dry powder of 1kg, add 105g water, afterwards, add the nanocellulose solution that 500g carboxyl content is 1.4mmol / g, wherein, nanocellulose effective concentration is 0.5% (that is 2.5g carboxyl content is 1.4mmol / g of nanocellulose), stirred for 5 minutes to obtain a mixed solution; utilize a GCC grinder (WAB DYNO-Mill) to grind and disperse the mixed solution for 12 minutes, and measure the average particle size of GCC after grinding to be 1.44 μm; The ground GCC is mixed with papermaking pulp, wherein the GCC filling amount is 20% (for absolute dry fiber), and after the pulp and GCC are evenly mixed, 1% cationic starch (for absolute dry pulp) is added, and then paper is made and tested Paper performance, see the following table for specific performance parameters.

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Abstract

The invention relates to a ground calcium carbonate suspension production process. The ground calcium carbonate suspension production process comprises the following steps: providing a nano-crystalline cellulose solution of which the surface carboxyl content is 0.2-1.5mmol / g and the diameter is smaller than or equal to 100 nanometers; and providing calcium carbonate to be ground, preparing a mixed solution by taking the nano-crystalline cellulose solution as a dispersing agent according to a mixing proportion of adding 1-10kg by oven dry weight of the nano-crystalline cellulose solution into 1 ton of calcium carbonate, and grinding the mixed solution to obtain a ground calcium carbonate suspension. According to the ground calcium carbonate solution production process, the nano-crystalline cellulose solution of which the surface carboxyl content is 0.2-1.5mmol / g and the diameter is smaller than or equal to 100 nanometers is taken as the dispersing agent, instead of conventional sodium polyacrylate and salts thereof, so that the grain size of finished ground calcium carbonate meets the requirement, and damage to the skin and the respiratory tract of a person caused by a synthetic monomer in the preparation and use processes of polyacrylic acid and salts thereof is effectively avoided. The invention further relates to the ground calcium carbonate suspension and paper.

Description

technical field [0001] The invention relates to a production process of ground calcium carbonate suspension, ground calcium carbonate suspension and paper. Background technique [0002] Ground calcium carbonate (GCC) is currently the most widely used inorganic mineral in the paper industry. The use of GCC can reduce the production cost of paper, and at the same time endow paper with better whiteness and light scattering coefficient. GCC is made of natural limestone, mainly calcite, through mechanical operations such as crushing and milling. [0003] In the paper industry, in order to facilitate the storage and distribution of GCC, the prepared GCC usually exists as a liquid suspension with a high solid content, and its solid content is usually 60%-75%. In order to reduce the energy consumption of the grinding process and the flocculation of particles during the storage of GCC, it is usually necessary to use a dispersant in the grinding process of GCC. [0004] Currently c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H17/65D21H27/00
Inventor 马朴刘翔飞秦昀昌王仁荣
Owner GOLD EAST PAPER JIANGSU
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