Preparation of pyrolized silicon oxide encapsulated titanium oxide powders treated with organic additives

A technology of titanium dioxide and organosilane, which is applied in the field of titanium dioxide particles, can solve the problems of polymer matrix defects and easy retention of metal oxide shells, etc.

Inactive Publication Date: 2007-01-17
EI DU PONT DE NEMOURS & CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, a serious disadvantage of this solution is that the formed metal oxide shell tends to retain moisture and/or generate moisture, which can...

Method used

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  • Preparation of pyrolized silicon oxide encapsulated titanium oxide powders treated with organic additives

Examples

Experimental program
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Embodiment 1

[0143] About 10 metric tons of pigmentary titanium dioxide particles (rutile crystal phase) substantially encapsulated with about 2 wt% fumed silica were produced using commercial scale equipment in accordance with the teachings of US Patent Publication 2003 / 0051635. An acidic aqueous slurry of this feedstock (~380 g / L) was adjusted to pH ~8 (sodium hydroxide) to neutralize residual chlorine present in the slurry. The slurry was then temporarily acidified to pH 6 (sulfuric acid), then readjusted to pH 8.5 (sodium hydroxide), and finally filtered (drum filter). The resulting filter cake was transferred from the filtration unit and dropped into a screw conveyor, where pure octyltriethoxysilane (OTES) was added to the filter cake by means of a peristaltic pump. The resulting pigment / OTES mixture is then fed directly into the spray dryer. The resulting dried product (dryer outlet temperature -100° C.) is then pneumatically conveyed to a jet mill (steam attritor), where it is subj...

Embodiment 2

[0145] About 55 metric tons of pigment-grade titanium dioxide particles (rutile crystal phase) substantially encapsulated with about 1.5 wt% fumed silica were produced using commercial scale equipment in accordance with the teachings of US Patent Publication 2003 / 0051635. An acidic aqueous slurry of this feedstock (~350 g / L) was adjusted to pH 4.7 (sodium hydroxide) to neutralize residual chlorine present in the slurry. The slurry having a pH between 4.0 (using hydrochloric acid to lower the pH) to 5.1 (using sodium hydroxide to raise the pH) was then filtered through a plate filter. The resulting filter cake was sent to an air flow dryer where it was dried while being treated with varying amounts of pure octyltriethoxysilane (OTES), which was sprayed directly into the dryer chamber. The resulting dried product (dryer outlet temperature ~ 120°C) was then transported to a jet mill (steam attritor) where it was subjected to deagglomeration and subsequently encapsulated. The res...

Embodiment 3

[0147] About 194 metric tons of pigmentary titanium dioxide particles (rutile crystal phase) substantially encapsulated with about 2.0 wt % fumed silica were produced using commercial scale equipment in accordance with the teachings of US Patent Publication 2003 / 0051635. An acidic aqueous slurry of this feedstock (-350 g / L) was pH adjusted to 8.0 (sodium hydroxide) to neutralize residual chlorine present in the slurry. The slurry with a pH between 4.5 (using hydrochloric acid to lower the pH) to 8.8 (using sodium hydroxide to raise the pH) was then filtered through a plate filter. The resulting filter cake was sent to a gas stream dryer where it was dried while being treated with varying amounts of pure trimethylolpropane (TMP), which was sprayed directly into the dryer chamber. The resulting dried product (dryer outlet temperature ~ 120°C) was then transported to a jet mill (steam attritor) where it was subjected to deagglomeration and subsequently encapsulated. The resultin...

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Abstract

A composition containing titanic oxide grain encapsulated by pyrolytic monox and its productionby organic additive treatment are disclosed. The material consists of organic silane, organic siloxane, fluoro-silane, organic phosphate, organic acid phosphate, organic pyrophosphate, organic poly-phosphate, organic metaphosphate, organic hypophosphite, organic sulfonic acid compound, sulfcarboxylic acid, hydrocarbyl carboxylic acid ester, hydrocarbyl carboxylic acid derivatives, hydrocarbyl amide, low-molecular-weight hydrocarbon wax, low-molecular-weight polyolefine, low-molecular-weight polyolefine multi-polymer, hydrocarbyl polyol, hydrocarbyl polyol derivative, alkanolamine, alkanolamine derivative, organic dispersant or their mixtures.

Description

technical field [0001] The present invention relates to a method for producing titanium dioxide particles suitable for incorporation into polymer matrices at high loadings, said particles having high resistance to discoloration, good light fastness, excellent volatility resistance, high dispersion derived from polymer additives properties, good handling in highly loaded polymer matrices, excellent optical properties and high packing density. Background technique [0002] The surface application of certain organosilicon compounds on initially untreated, chlorinated titanium dioxide particles has been described as enabling the incorporation of particles into various thermoplastic polymers at high loadings, high treatment rates and high dispersibility In substrate matrices, especially polyolefin derived matrices, see, for example, US Pat. Nos. 5,607,994, 5,631,310, 5,889,090, and 5,959,004. In addition, the existing process enables the subsequent produc...

Claims

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Application Information

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IPC IPC(8): C09C3/12C08K9/06C08L23/00C08L33/00C08L67/00C08L77/00C08L63/00
Inventor J·N·伯明翰S·C·德拉沃Y·S·苏P·耶纳科夫K·J·利里C·D·穆西克P·M·尼登祖N·S·苏布拉马尼安
Owner EI DU PONT DE NEMOURS & CO
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