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Process for preparing core-shell structure TiO2/CaCO3 composite white pigment

A technology of white pigment and shell structure, applied in inorganic pigment processing, chemical instruments and methods, fibrous fillers, etc., to avoid agglomeration, simple and controllable process, and stable product performance.

Active Publication Date: 2009-07-08
SHANGHAI DONGSHENG NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its role in reducing the amount of titanium dioxide and reducing costs is limited

Method used

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  • Process for preparing core-shell structure TiO2/CaCO3 composite white pigment
  • Process for preparing core-shell structure TiO2/CaCO3 composite white pigment
  • Process for preparing core-shell structure TiO2/CaCO3 composite white pigment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Add raw gypsum and water to the reactor to prepare 0.817L of a suspension with a calcium sulfate content of 150g / L, add 10g of anatase titanium dioxide, and stir well; add 1.42g of lithium sulfate to control the calcium ion concentration of the system at about 2× 10 -5 mol / L; prepare 1.66L of potassium carbonate solution with a concentration of 75g / L; add the potassium carbonate solution to the calcium sulfate-titanium dioxide mixed suspension within 2 hours, so that calcium carbonate particles are slowly generated and deposited on the surface of titanium dioxide particles to form a shell , to obtain a composite material with a core-shell structure; the obtained suspension is filtered, washed, and dried at 110°C to prepare a composite white pigment dry powder containing 10% titanium dioxide. The obtained product was observed with a transmission electron microscope, and the particles showed a core-shell structure.

[0026] Paper filling experiment: beating according to ...

Embodiment 2

[0031] Add plaster of paris and water into the reactor to prepare 2.723L of a suspension with a calcium sulfate content of 10g / L, add 80g of rutile titanium dioxide, and stir well; add 0.043g of sodium bisulfate to control the calcium ion concentration of the system at about 5× 10 -4 mol / L; prepare 0.38L ammonium carbonate solution with a concentration of 50g / L; add the ammonium carbonate solution to the calcium sulfate-titanium dioxide mixed suspension within 8 hours, so that calcium carbonate particles are slowly generated and deposited on the surface of titanium dioxide particles to form a shell , to obtain a composite material with a core-shell structure; the obtained suspension is filtered, washed, and dried at 110° C. to prepare a composite white pigment dry powder containing 80% titanium dioxide. The resulting product was observed with a transmission electron microscope, see figure 1 , the particles have a core-shell structure.

[0032] Adopt the method identical with...

Embodiment 3

[0036] Add anhydrite and water into the reactor to prepare 1.7L of a suspension with a calcium sulfate content of 40g / L, add 50g of anatase titanium dioxide, and stir well; add 0.52g of sodium bisulfate and 0.68g of sodium sulfate, and the The concentration is controlled at about 5×10 -5 mol / L; the preparation concentration is 250g / L sodium bicarbonate solution 0.168L; add the sodium bicarbonate solution into the calcium sulfate-titanium dioxide mixed suspension within 6 hours, so that calcium carbonate particles are slowly generated and deposited on the surface of titanium dioxide particles to form shell layer to obtain a composite material with a core-shell structure; the resulting suspension is filtered, washed, and dried at 110° C. to prepare a composite white pigment dry powder containing 50% titanium dioxide. The obtained product was observed with a transmission electron microscope, and the particles showed a core-shell structure.

[0037] Adopt the method identical wit...

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Abstract

The invention discloses a preparation method of a core-shell structure TiO2 / CaCO3 composite white pigment, comprising the following steps: adding titanium dioxide to a calcium sulfate suspension, adding a calcium ion concentration regulator, and controlling the calcium ion concentration of the system to 2×10- 5-5×10-4 mol / liter, and then adding the carbonate solution into the mixed suspension of calcium sulfate-titanium dioxide to obtain a suspension of composite material with a core-shell structure. The process of the method of the present invention is simple and controllable, and the product performance is stable. Calcium carbonate is dense, uniform and firmly deposited on the surface of titanium dioxide particles to form a shell layer, which can well avoid the agglomeration of titanium dioxide particles and maximize the performance of the inherent characteristics of titanium dioxide. The obtained composite White pigment can greatly reduce the cost while maintaining the performance of titanium dioxide. The composite white pigment can replace titanium dioxide and be used as paper-making filler or coating, and can improve the whiteness and opacity of paper.

Description

technical field [0001] The present invention relates to TiO 2 / CaCO 3 The preparation method of composite white pigment, specifically, relates to the TiO2 with core-shell structure of white pigment for papermaking 2 / CaCO 3 Preparation method of composite white pigment. Background technique [0002] Titanium dioxide (TiO 2 ), commonly known as titanium dioxide, is by far the most excellent white pigment. It has stable physical and chemical properties, excellent hiding power, tinting power, light and heat stability, and is widely used in coatings, plastics, papermaking, chemical fiber, ink, rubber and other fields. There are two main crystal forms of titanium dioxide, namely anatase and rutile, the latter having better hiding power and weather resistance. With the development of the world economy and the advancement of human science and technology, the application fields of titanium dioxide are becoming wider and wider, and the market demand for titanium dioxide is also...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09C1/36C09C1/02C09C3/06
Inventor 施晓旦许晓琳李丽
Owner SHANGHAI DONGSHENG NEW MATERIALS
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