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Composite white pigment and its preparing method

A white pigment, titanium dioxide technology, applied in the direction of inorganic pigment treatment, chemical instruments and methods, fibrous fillers, etc., can solve limited problems, achieve the effects of reducing costs, improving whiteness and opacity, and avoiding agglomeration

Active Publication Date: 2007-03-28
SHANGHAI DONGSHENG NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the composite pigment obtained by this method, titanium dioxide and calcium carbonate particles only form a certain bond between the contact surfaces, which is basically still a mixture. Therefore, in order to obtain similar properties as titanium dioxide, such as hiding power and opacity, The amount it can replace titanium dioxide is limited

Method used

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  • Composite white pigment and its preparing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1) Add 50kg of anatase titanium dioxide with an average particle size of 0.3μm and 50kg of deionized water into 0.5m 3 In the reactor, prepare a titanium dioxide slurry with a solid content of 50%, add 750g sodium hexametaphosphate, and adjust the pH value to 8 with 200g / L sodium hydroxide solution, and stir;

[0030] 2) Add 82kg of calcium nitrate and 53kg of sodium carbonate to the two feeding tanks, and then add deionized water to the total volume of 0.2m 3 .

[0031] 3) Add calcium nitrate solution and sodium carbonate solution to the reaction kettle simultaneously within 1 hour, stir, so that calcium carbonate particles are generated and deposited on the surface of the titanium dioxide particles to form a firm and uniform shell;

[0032] 4) The resulting suspension is filtered, washed and dried to obtain a composite white pigment containing 50% by weight of titanium dioxide.

[0033] The whiteness of the sample is measured according to GB / T17749-1999, and the dec...

Embodiment 2

[0035] 1) Add 10kg of rutile titanium dioxide with an average particle size of 0.2μm and 80kg of deionized water into 1m 3 In the reaction kettle, prepare titanium dioxide slurry with 20% solid content, add 50g sodium polyacrylate, and adjust the pH value to 11 with 200g / L sodium hydroxide solution, and stir;

[0036] 2) Add 264.5kg of calcium iodide and 125.5kg of potassium carbonate to the two feeding tanks, and then add deionized water to the total volume of 1.6m 3 .

[0037] 3) Add calcium iodide solution and potassium carbonate solution to the reaction kettle simultaneously within 5 hours, keep stirring rapidly, so that calcium carbonate particles are generated and deposited on the surface of titanium dioxide particles to form a firm and uniform shell;

[0038] 4) The resulting suspension is filtered, washed and dried to obtain a composite white pigment containing 10% (by weight) of titanium dioxide.

[0039]The measured whiteness of the obtained product was 92.5%, and ...

Embodiment 3

[0041] 1) Add 90kg of anatase titanium dioxide with an average particle size of 0.5μm and 60kg of deionized water into 0.5m 3 In the reaction kettle, prepare titanium dioxide slurry with 60% solid content, add 125g polyacrylamide, and adjust the pH value to 9.5 with 200g / L sodium hydroxide solution at the same time, and stir;

[0042] 2) Add 7.8kg of calcium fluoride and 7.9kg of ammonium bicarbonate to the two feeding tanks, and then add deionized water to the total volume of 0.3m 3 .

[0043] 3) Add calcium fluoride solution and ammonium bicarbonate solution to the reaction kettle at the same time within 3 hours, keep stirring rapidly, so that calcium carbonate particles are generated and deposited on the surface of titanium dioxide particles to form a firm and uniform shell;

[0044] 4) The resulting suspension is filtered and washed to prepare a composite white pigment slurry with a solid content of 60% and a titanium dioxide content of 90% by weight.

[0045] The measur...

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Abstract

The invention discloses compound white dye and the preparing method. It contains titanium dioxide particle inner core and calcium carbonate particle outer casing whose content is 10-90% of the total mass and thickness is 5-250nm. It has the advantages of simple and controllable preparing process, stable product property, compact calcium carbonate used to avoid titanium dioxide particles reuniting to keep their inherent characteristics, reducing cost, and using in paper making filling or coating to increase paper whiteness and opaqueness.

Description

technical field [0001] The invention relates to the technical field of production of white pigments, in particular to a titanium dioxide-calcium carbonate composite white pigment and a preparation method thereof. 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 increasing day by day. On the other hand, due to the increas...

Claims

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Application Information

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