Modified talcum for papermaking coating and preparation method thereof

A talc and modification technology, applied in the field of preparation of modified talc, can solve the problems of long dispersion time, large power consumption, and difficulty in dispersion, and achieve the effects of easy water dispersion, little dust pollution, and stable suspension.

Active Publication Date: 2014-04-23
辽宁艾海滑石有限公司
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0003] The talc pigment used in paper-making coatings is usually made of talc raw materials through dry mechanical crushing, and then through the particle size classification process to produce powder products that meet the fineness requirements. Under phase conditions, the talc pigment dispersion slurry is prepared first. The structural characteristics of talc endow talc with strong hydrophobicity and lubricity, resulting in poor affinity with water, and it is very difficult to disperse in aqueous media. The prepared talc dispersion slurry has low solid content, poor rheology, high viscosity and poor stability, and is prone to passivation and precipitation, especially for ultrafine high specific surface area talc pigments. Low-viscosity dispersions are more difficult, not only takes a long time to disperse, consumes a lot of power, but also causes dust to fly in the production site, which seriously pollutes the production environment, thus limiting the wide application of talc in the field of paper coatings

Method used

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  • Modified talcum for papermaking coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Such as figure 1 As shown, a kind of talc in flake form whose talc component is 88% pure through X-ray diffraction analysis is selected as raw material, first, block talc raw material is crushed to a diameter of less than 6mm by jaw crusher and hammer crusher, and then conveyed To the Raymond mill, grind and pulverize to 325 mesh fine powder, and then transport it to the airflow pulverizer with powder classification system through negative pressure airflow to continue grinding and pulverization, and use the closed-circuit classification process to classify the ultrafine powder with a content of 2 microns and 50.3%. The fine talc powder is conveyed to the fine powder storage bin through negative pressure airflow, and the ultrafine talc powder in the fine powder storage bin is continuously and quantitatively conveyed to the screw mixer by a screw conveyor with a metering device for full mixing Dissociate by rubbing, and at the same time, spray the pre-prepared modifier mi...

Embodiment 2

[0023] Such as figure 1 As shown, a kind of talc in flake form whose talc component is 88% pure through X-ray diffraction analysis is selected as raw material, first, block talc raw material is crushed to a diameter of less than 6mm by jaw crusher and hammer crusher, and then conveyed To the Raymond mill, grind and pulverize to 325 mesh fine powder, and then transport it to the jet pulverizer with powder classification system through negative pressure airflow to continue grinding and pulverization, and use the closed-circuit classification process to classify the ultrafine powder with a content of 64.8% in 2 microns. The fine talc powder is conveyed to the fine powder storage bin by negative pressure airflow; the ultrafine talc powder in the fine powder storage bin is continuously and quantitatively conveyed to the spiral mixer through a screw conveyor with a metering device and fully stirred Dissociate by rubbing, and at the same time, spray the pre-prepared modifier mixture ...

Embodiment 3

[0027] Such as figure 1 As shown, a kind of talc in flake form whose talc component is 88% pure through X-ray diffraction analysis is selected as raw material, first, block talc raw material is crushed to a diameter of less than 6mm by jaw crusher and hammer crusher, and then conveyed To the Raymond mill, grind and pulverize to 325 mesh fine powder, and then transport it to the airflow pulverizer with powder classification system through negative pressure airflow to continue grinding and pulverization, and use the closed-circuit classification process to classify the ultrafine powder with a content of 2 microns and 67.5%. The fine talc powder is conveyed to the fine powder storage bin by negative pressure airflow; the ultrafine talc powder in the fine powder storage bin is continuously and quantitatively conveyed to the spiral mixer through a screw conveyor with a metering device and fully stirred Dissociate by rubbing, and at the same time, spray the pre-prepared modifier mix...

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Abstract

The invention relates to a modified talcum for a papermaking coating. The product is a white cylindrical granular talcum having a whiteness being not less than 88% and comprises the following main ingredients in percentage by mass: not less than 60% of natural talcum in the shape of a sheet-shaped particle, 0.3-0.8% of anion-type polyacrylic acid-acrylate-sulfonate copolymer, 0.2-0.5% of sodium carboxymethylcellulose, 0.02-0.1% of industrial-grade NaOH, and 5.0-10.0% of water. Compared with the prior art, the invention has the beneficial effects that the high-performance modified talcum product is prepared by the preparation method disclosed by the invention, and the product has high hydrophily, is easy to disperse in water phase; moreover, a pigment dispersoid is low in viscosity, good in the mobility, stable in the suspension property, and not easy to precipitate, so that the quality of paper is effectively improved.

Description

technical field [0001] The invention relates to the technical field of manufacture and application of talc products, in particular to a preparation method of modified talc used for papermaking coatings. Background technique [0002] The chemical name of talc: hydrated magnesium silicate, its molecular formula: 3MgO 4SiO 2 ·H 2 O, talc has the characteristics of low hardness, high whiteness, lipophilic and hydrophobic, lubricating, and flake particle shape similar to kaolin. It is often used in paper making fillers in paper making industry, and also used in paper making paint pigments. [0003] The talc pigment used in paper-making coatings is usually made of talc raw materials through dry mechanical crushing, and then through the particle size classification process to produce powder products that meet the fineness requirements. Under phase conditions, the talc pigment dispersion slurry is prepared first. The structural characteristics of talc endow talc with strong hydrop...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09C1/28C09C3/10D21H19/40
Inventor 宋宝祥齐颖李文祥姜丹何万玉
Owner 辽宁艾海滑石有限公司
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