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Preparation method for calcium sulfate whisker papermaking coating pigment

A calcium sulfate whisker and pigment technology, which is applied in pigmented coatings, fibrous fillers, dyeing physical treatment, etc., can solve the difficulty in preparing calcium sulfate whisker suspension, which is difficult to meet the high concentration and low viscosity of papermaking coatings, and difficult Preparation of pigment suspensions and other issues to achieve the effect of expanding the application field of whiskers, widening conditions, and solving solid pollution

Inactive Publication Date: 2013-12-18
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, there are many key problems that need to be solved when calcium sulfate whiskers are used as paper coating pigments, such as: (1) There are many crystal water forms in calcium sulfate whiskers, and the crystal water forms will transform into each other under different temperature and humidity, The stability of calcium sulfate whiskers in different crystal water forms is very different in water, and the crystal form of calcium sulfate whiskers and the stability in water must be studied and solved; (2) due to the interlayer structure of calcium sulfate whiskers and The connection of chemical bonds is significantly different from that of calcium carbonate and china clay, which makes it very difficult to prepare high-solid content calcium sulfate whisker suspensions. It is difficult to prepare pigment suspensions with a solid content of more than 30% without adding a dispersant. Meet the high concentration and low viscosity requirements of paper coatings; while conventional polyacrylates, polyphosphates and other dispersants cannot meet the requirements of calcium sulfate whisker dispersion and grinding, so the dispersion performance of calcium sulfate whiskers must be studied; ( 3) Calcium sulfate whisker raw material has superior properties such as high purity, low abrasion, and high whiteness. Its basic performance indicators for papermaking coating pigments are different from calcium carbonate and china clay pigments. Pigments suitable for calcium sulfate whiskers must be studied performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Add 300g of calcium sulfate whiskers extracted from desulfurized gypsum with a purity of ≥99%, a whiteness of ≥90%ISO, and a particle size range of 20-100μm, and slowly add dispersant containing 2% MOA-3P under stirring (the amount of dispersant is In the aqueous dispersion of calcium sulfate dihydrate (calcium whiskers), adjust the concentration of the suspension to 40%, the pH value to 6.5-7.0, pre-disperse for 10 minutes, and transfer to the sand mill; adjust the sand milling process to grind the diameter of the zirconium beads 0.8mm-1.0mm, the ratio of ball to material is 5:1, the grinding speed is 2000 rpm, and the calcium sulfate whisker is ground for 90 minutes, and the material is discharged; the solid content is 40%-45%, and the viscosity is 300-500mPa. s, the proportion of ≤2μm particles is 65%-70% (determination of particle size by sedimentation method), calcium sulfate whisker pigment dispersion with whiteness ≥90%ISO; it can be used as coating pigment for pa...

Embodiment 2

[0020] Take 300g of calcium sulfate whiskers extracted from phosphogypsum waste residue with a purity ≥ 99%, whiteness ≥ 90% ISO, and a particle size range of 5-150 μm, slowly add 4% MOA-3P main dispersant and 1% In the aqueous dispersion of Tamol NN 8906 auxiliary dispersant (the amount of dispersant is calculated as calcium sulfate dihydrate whiskers), adjust the concentration of the suspension to 45%, the pH value is 6.5-7.0, pre-disperse for 10 minutes, and transfer to a sand mill Middle; adjust the sanding process, the diameter of the grinding zirconium beads is 0.8mm-1.0mm, the ball-to-material ratio is 5:1, the grinding speed is 2000 rpm, the calcium sulfate whiskers are ground for 180 minutes, and the material is discharged; the solid content is 45 %-50%, the viscosity is 400-600mPa.s, the proportion of ≤2μm particles is 75%-80% (determination of particle size by sedimentation method), whiteness ≥90%ISO calcium sulfate whisker pigment dispersion; can be used Used as co...

Embodiment 3

[0022] Take 300g of calcium sulfate whiskers extracted from phosphogypsum waste residue with a purity ≥ 99%, whiteness ≥ 90% ISO, and a particle size range of 5-150 μm, slowly add 6% Lutensit A-EP main dispersant and 1 In the aqueous dispersion of % Tamol DN auxiliary dispersant (the amount of dispersant is based on calcium sulfate dihydrate whiskers), adjust the concentration of the suspension to 50%, the pH value is 6.5-7.0, pre-disperse for 10 minutes, and transfer to a sand mill Middle; adjust the sanding process, the diameter of the grinding zirconium beads is 0.8mm-1.0mm, the ball-to-material ratio is 4:1, the grinding speed is 2000 rpm, the calcium sulfate whiskers are ground for 270 minutes, and the material is discharged; the solid content is 50 %-55%, the viscosity is 300-800mPa.s, the proportion of ≤2μm particles is more than 90% (determination of particle size by sedimentation method), whiteness ≥90%ISO calcium sulfate whisker pigment dispersion; can be used for pap...

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Abstract

The invention discloses a preparation method for calcium sulfate whisker papermaking coating pigment. According to the preparation method, a calcium sulfate whisker byproduct extracted from industrial gypsum waste residue is used as raw material; and the coating pigment of which the solid content is 30-60%, the granule less than or equal to 2mum accounts for 60-95% and the whiteness is more than or equal to 90% ISO is prepared by the following steps of converting a crystal morphology, pre-dispersing, grinding and the like, wherein the coating pigment conforms to the papermaking application. The calcium sulfate whisker papermaking coating pigment dispersion prepared by the preparation method has the advantages of high solid content, low viscosity, good stability and big possibility of dispersing in water, and the problem that high-density and low-viscosity stable pigment dispersion is difficultly prepared by the calcium sulfate whisker is solved. The prepared calcium sulfate whisker papermaking coating pigment has the characteristics of high whiteness, low abrasion loss, good ink absorbency and the like, can be effectively used for pigment finishing glue applying coating, and the priming coat or cover coat of low weight coated paper, copper plate paper or a coated white plate (card).

Description

technical field [0001] The invention relates to a preparation method of calcium sulfate whisker papermaking coating pigment, which belongs to the technical field of papermaking. Background technique [0002] Calcium sulfate whisker (also known as gypsum whisker, gypsum fiber) is a new type of inorganic material extracted from desulfurization gypsum, phosphogypsum and other industrial gypsum residues or metal smelting waste residues at home and abroad in recent years. Calcium sulfate whiskers have many excellent physical and chemical properties such as low wear, high temperature resistance, acid and alkali resistance, and dimensional stability. However, due to the limitations of application technology development and application fields, calcium sulfate whiskers are currently used as a small amount of additives in the plastic and rubber industries. In addition, there is no large-scale industrial application in other industries. In the production of the paper industry, in orde...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09C1/02C09C3/04C09C3/08C09C3/10D21H19/38
Inventor 王玉珑覃盛涛刘艳新
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY