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Method for complexing composite calcium carbonate filling material

A technology of compound calcium carbonate and calcium carbonate, applied in the compound field of compound calcium carbonate filler, can solve the problems of increasing water treatment load, reducing paper quality, weakening paper strength, etc., so as to increase paper whiteness, save fiber consumption, increase The effect of tensile strength

Inactive Publication Date: 2008-08-13
GUANGDONG IND TECHN COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally, the one-way retention rate of calcium carbonate filler is about 14%, and the retention rate after repeated reuse of white water is only 40%. A large number of fillers flow away with water, which not only wastes raw materials, but also increases the load of water treatment.
At the same time, there is no binding force between the calcium carbonate filler and the fiber, so it cannot be added too much, otherwise it will easily cause powder and hair loss after the paper is made, which will weaken the strength of the paper and reduce the quality of the paper.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The composite method of composite calcium carbonate filler comprises the steps of: dispersing calcium carbonate into a dispersion suspension with a mass concentration of 1%, and mixing it with a fully dissolved polymer aqueous solution (starch aqueous solution) with a mass concentration of 1% to obtain the mixture , the mass ratio of calcium carbonate and starch aqueous solution is 50: 1; above-mentioned mixture is mixed with acidic electrolytic solution sulfuric acid; acidic electrolytic solution sulfuric acid: the volume ratio of mixture is 5: 1, then stirs 30 minutes, rotating speed 200 revolutions / minute, After standing overnight, remove the supernatant, and the lower white layer substance is the composite calcium carbonate filler, and the obtained composite calcium carbonate filler is in the form of particles visible to the naked eye. In 80 grams of paper, adding 15% (mass percentage) of the composite calcium carbonate filler of the present invention increases the t...

Embodiment 2

[0017] The composite method of composite calcium carbonate filler comprises the steps of: dispersing calcium carbonate into a dispersion suspension with a mass concentration of 50%, and mixing it uniformly with a fully dissolved polymer aqueous solution (oxidized starch aqueous solution) with a mass concentration of 30%, to obtain The mixture, the mass ratio of the calcium carbonate and the oxidized starch aqueous solution is 10:1; the mixture is mixed with the acidic electrolyte solution ammonium nitrate solution, the ammonium nitrate: the volume ratio of the mixture is 1:1, stirred evenly, then after standing still, remove The supernatant liquid and the lower white layer substance are composite calcium carbonate fillers, and the obtained composite calcium carbonate fillers are in the form of particles visible to the naked eye. In 80 grams of paper, add 15% (mass percentage) composite calcium carbonate filler of the present invention, the paper tensile strength increases by 25...

Embodiment 3

[0019] The composite method of composite calcium carbonate filler comprises the steps of: dispersing calcium carbonate into a dispersion suspension with a mass concentration of 25%, pouring fully dissolved polymer aqueous solution (chitosan aqueous solution) with a mass concentration of 15%, and mixing uniformly Afterwards, obtain mixture, the mass ratio of described calcium carbonate and chitosan aqueous solution is 1: 5; Above-mentioned mixture is poured in the acid electrolyte solution ammonium chloride solution, and described ammonium chloride: mixture volume ratio is 10: 1, Stir while pouring (stirring for 30 minutes, rotating speed 200 rpm), after standing overnight, remove the supernatant, the lower layer of white layer substance is the composite calcium carbonate filler, and the obtained composite calcium carbonate filler is visible to the naked eye. In 80 grams of paper, adding 15% (mass percentage) of the composite calcium carbonate filler of the present invention inc...

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PUM

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Abstract

The invention discloses a composite method for a composite calcium carbonate filler, comprising following steps: dispersing calcium carbonate to be suspending liquid with a mass concentration of 1-50, mixing it evenly with high molecule aqueous solution with a mass concentration of 1-30to obtain a blend, the mass ratio of calcium carbonate to the high molecule aqueous solution is 50:1-1:5; mixing above blend with acidic electrolyte solution, the volume ratio of the acidic electrolyte solution to the blend is 1:1-10:1, mixing evenly, standing, removing supernatant liquor, the white lower layer matter is the composite pearl filler. The invented method can increase fibrous hydrophilicity, increase filler retention, enhance paper intensity and whiteness, and saving fabric.

Description

technical field [0001] The invention belongs to the field of chemical synthesis, and in particular relates to a composite method for composite calcium carbonate filler used in papermaking and filling process. Background technique [0002] Calcium carbonate is a white pigment. According to different production methods, it is divided into precipitated calcium carbonate (also called light calcium or PCC) and ground calcium carbonate (also called heavy calcium or GCC). They are the main minerals added in the papermaking process. The main purpose of filling is to increase the opacity and whiteness, improve the printing performance of the paper, and reduce the production cost. It is an important step in the papermaking process. Since the refractive index of precipitated calcium carbonate is greater than that of heavy calcium, it is more widely used in filling. [0003] At present, paper mills directly add calcium carbonate fillers to the slurry, and then add retention aids to min...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H17/69D21H17/28D21H17/29D21H17/36D21H17/65
Inventor 颜进华
Owner GUANGDONG IND TECHN COLLEGE
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