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Ground calcium carbonate production process, ground calcium carbonate suspension and paper

A technology of grinding calcium carbonate and production process, which is applied in the production process of grinding calcium carbonate, grinding calcium carbonate suspension and paper, which can solve the problems of skin and respiratory tract irritation, flammability, strong irritation of acrylic acid, etc., and achieve tearing and Effect of improving cohesion and improving binding force

Active Publication Date: 2015-02-11
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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  • Ground calcium carbonate production process, ground calcium carbonate suspension and paper

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Under stirring conditions, 505g of water was added to 1kg of GCC dry powder, and then 100g of nanocellulose solution with a carboxyl content of 1.4mmol / g was added, wherein the effective concentration of nanocellulose was 0.5% (that is, 0.5g of carboxyl content was 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 average particle size of GCC was measured to be 1.54 μm after grinding; The ground GCC is mixed with papermaking pulp, and the filling amount of GCC is 20% (for absolute dry fiber). After the pulp and GCC are mixed evenly, 1% cationic starch (for absolute dry pulp) is added, and then made into paper and tested. Paper performance, see the following table for specific performance parameters.

Embodiment 2

[0039] Under stirring conditions, 305g of water was added to 1kg of GCC dry powder, and then 300g of nanocellulose solution with a carboxyl content of 1.4mmol / g was added, wherein the effective concentration of nanocellulose was 0.5% (that is, 1.5g of carboxyl content was 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 average particle size of GCC was measured to be 1.46 μm after grinding; The ground GCC is mixed with papermaking pulp, and the filling amount of GCC is 20% (for absolute dry fiber). After the pulp and GCC are mixed evenly, 1% cationic starch (for absolute dry pulp) is added, and then made into paper and tested. Paper performance, see the following table for specific performance parameters.

Embodiment 3

[0041] Under stirring conditions, add 105g of water to 1kg of GCC dry powder, after that, add 500g of nanocellulose solution with a carboxyl content of 1.4mmol / g, wherein the effective concentration of nanocellulose is 0.5% (that is, 2.5g of 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 average particle size of GCC was determined to be 1.44 μm after grinding; The ground GCC is mixed with papermaking pulp, and the filling amount of GCC is 20% (for absolute dry fiber). After the pulp and GCC are mixed evenly, 1% cationic starch (for absolute dry pulp) is added, and then made into paper 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 grinding calcium carbonate production process, grinding 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 commonly us...

Claims

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Application Information

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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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