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Titanium dioxide product

A titanium dioxide, selected technology, applied in the direction of titanium dioxide, titanium oxide/hydroxide, ink, etc., to achieve the effect of providing environmental benefits and reducing costs

Active Publication Date: 2019-04-26
VENATOR MATERIALS UK LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

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Method used

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  • Titanium dioxide product
  • Titanium dioxide product
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0120] Electron microscopy image analysis was performed on 140 conventional pigmentary titanium dioxide materials to determine their crystal size and geometric weight standard deviation (GWSD). Minimum, maximum and average values ​​were determined.

[0121] Image analysis was also performed on three commercially available macrocrystalline titania products. Their crystal size and geometric standard deviation are recorded.

[0122] Table 1 shows the results of the image analysis

[0123]

[0124] The crystal size distribution of products with different values ​​of mean crystal size and geometric weight standard deviation was then calculated based on the material with lognormal distribution. The values ​​taken for mean crystal size and geometric weight standard deviation are intended to be illustrative and not directly reflective of individual prior art products.

[0125] Table 2 shows the differences in the distribution of crystals within the materials based on the mean cr...

Embodiment 2

[0129] prepared TiO with average crystal sizes of 0.397 μm and 0.386 μm, respectively 2 particles and tested in white ink.

[0130] method:

[0131] The rutile titanium dioxide material is produced using the sulfate method (Blumenfeld variant). Conventional processing takes place during the ore grinding, digestion, purification, precipitation and leaching stages. The metatitanic acid slurry from filtration was spiked with 1.00% Blumenfeld rutile cores (prepared from sodium titanate) since the goal was to produce larger than conventional crystal sizes. To this nucleation material was further added 0.10% Al 2 o 3 (as aluminum sulfate) and 0.2% K 2 O (as potassium sulfate). The resulting material was calcined to a temperature of 960 degrees Celsius over a period of about 12 hours.

[0132] The calciner effluent was pulverized, dispersed and sand milled to a particle size of about 0.45 microns, then coated with 2.7% dense silica and 2.4% alumina.

[0133]The coated materia...

Embodiment 3

[0173] prepared TiO with average crystal sizes of 0.28, 0.32 and 0.36 microns 2 particles and tested in alkyd paints.

[0174] method:

[0175] A certain amount of metatitanic acid from the sulfate process was divided into three portions. 1.88%, 1.26% and 0.89% rutile cores were added to these portions respectively.

[0176] Each part also uses 0.07% Al 2 o 3 (as aluminum sulfate), 0.20% K 2 O (as potassium sulfate) and 0.20% P 2 o 5 (as monoammonium phosphate).

[0177] Each of the three parts was calcined separately, increasing the temperature by 1 degree per minute until a rutile content of >99% was measured. At this point, the calcination was stopped.

[0178] The three fractions have titanium dioxide with average crystal sizes of 0.28, 0.32 and 0.36 microns, respectively.

[0179] The properties of these titania materials are listed in Table 6 below:

[0180] Table 6

[0181]

[0182] Each of the three calciner effluents was ground to three different partic...

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Abstract

The invention provides a pigmentary particulate material selected from the group consisting of titanium dioxide, doped titanium dioxide and a mixture thereof, wherein the particulate material has a mean crystal size in the range of from0.3 to 0.5 microns and a crystalsize distribution such that 40wt% or more of the particulate material has a crystal size in the range of from0.3to 0.5microns, and wherein theratio of the meanparticle size to the mean crystal size is 1.25 or less. Theparticulate material may be used in a composition comprising pigmentary material dispersed in a vehicle, to provide improved opacity for said composition.

Description

field of invention [0001] The present invention relates generally to titanium dioxide particles and their use in thin films in particular. Background technique [0002] Titanium dioxide (TiO 2 ) is generally considered the primary white pigment in commerce. It has an extremely high refractive index, negligible color and is inert. Titanium dioxide is commonly found in the market in either of two main polymorphic forms, anatase or rutile; for most commercial applications, rutile is the ideal form. [0003] Titanium dioxide is known to be used as an opacifier in paints, paper, plastics, ceramics, inks, etc. [0004] There are two main methods of preparing raw pigment titanium dioxide: the sulfate method and the chloride method. The sulfate method is based on the digestion of ilmenite or titania slag in concentrated sulfuric acid. After removing iron as ferric sulfate, the solution is heated and diluted with water. Titanium hydrolyzes to form a titanyl sulfate precipitate,...

Claims

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Application Information

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IPC IPC(8): C01G23/047
CPCC01G23/047C01P2002/60C01P2004/62C09D5/002C09D5/004C09D11/037C09D7/68C09D7/69C09D7/61C01P2006/60C08K3/013C01G23/08C01P2002/90C01P2004/51C08K3/22C08K2003/2241C09C1/3607C09D11/101
Inventor J·L·爱德华兹J·罗布J·坦珀利R·M·埃文斯
Owner VENATOR MATERIALS UK LTD
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