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Preparation of aluminum phosphate or polyphosphate particles

A technology of aluminum polyphosphate and aluminum phosphate, applied in phosphorus compounds, inorganic chemistry, fibrous fillers, etc., can solve the problems of high cost and so on

Inactive Publication Date: 2009-11-11
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, titanium dioxide is known to be an expensive pigment

Method used

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  • Preparation of aluminum phosphate or polyphosphate particles

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Effect test

Embodiment 1

[0072] Preparation of aluminum phosphate powder

[0073] 791g phosphoric acid (81.9% by weight of H 3 PO 4 or 59.3 wt% P 2 o 5 ) and 189g of hydrated aluminum hydroxide (85.3% by weight of Al(OH) 3 or 58.1 wt% Al 2 o 3 ) was reacted in 210 g of water at 80° C. for 1 hour (P / Al final molar ratio=2.99) to obtain an acidic aluminum phosphate solution. In the second step, 1155 g of commercially purified sodium aluminate solution (9.7 wt% Al and 11.2 wt% Na, or 18.3 wt% Al 2 o 3 and 15.7 wt% Na 2 O, final Na / Al=1.36) and acidic aluminum phosphate solution were simultaneously added to a stirred vessel filled with 1500 g of water at room temperature.

[0074] The final reaction pH was 7.1 and the temperature during the reaction was maintained at 45°C. The resulting dispersion was centrifuged (30 minutes, 2500rpm—relative centrifugal force: 1822g) to remove the reaction mother liquor to form a filter cake, which was washed once with water (1000g of washing water) to obtain a...

Embodiment 2

[0076] Preparation of Aluminum Phosphate Slurry

[0077] 10.0 g of water was added to a 250 mL beaker. During mixing at 800 RPM (Cowles), add about 1.34 g (1% of non-volatile content) of sodium polyphosphate. After 5 minutes, 150.0 g of aluminum phosphate slurry (30% non-volatiles) was added slowly (25 g / min). After another 5 minutes, the agitation speed was increased to 1800 RPM and 109.0 g of aluminum phosphate powder (80% non-volatiles) were added slowly (10 g / min). After powder addition, the slurry was kept stirring at 1800 RPM for 20 minutes.

Embodiment 3

[0079] Preparation of Aluminum Phosphate Slurry

[0080] 72.0 g of water was added to a 250 mL beaker. During mixing at 800 RPM (Cowles), about 0.96 g (1% of non-volatile content) of sodium polyphosphate was added. After 5 minutes, the agitation speed was increased to 1800 RPM and 122.0 g of aluminum phosphate powder (80% non-volatiles) was added slowly (10 g / min). After powder addition, the slurry was held at 1800 RPM for 20 minutes.

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Abstract

A process for the preparation of amorphous aluminum phosphate or polyphosphate-based pigment by reacting aluminum phosphate and sodium aluminate is provided. The amorphous aluminum phosphate or polyphosphate is characterized by a skeletal density of less than 2.50 grams per cubic centimeter and a phosphorus to aluminum mole ratio of greater than 1. In one embodiment, the composition is useful in paints as a substitute for titanium dioxide.

Description

[0001] earlier related application [0002] This application claims priority to US Provisional Application No. 60 / 837,397, filed August 11, 2006, and US Provisional Application No. 60 / 903,237, filed February 22, 2007. The contents of both provisional patent applications are hereby incorporated by reference in their entirety for purposes of United States patent practice. field of invention [0003] Provided herein are methods of making compositions comprising aluminum phosphate, aluminum orthophosphate, or aluminum polyphosphate, the compositions comprising hollow particles. The invention further provides the use of such particles as pigments in paints. Aluminum phosphate, aluminum orthophosphate and aluminum polyphosphate compositions in slurry form are also provided. In certain embodiments, the aluminum phosphate, aluminum orthophosphate, or aluminum polyphosphate further comprises ions, such as sodium, potassium, or lithium ions. Background of the invention [0004] Tit...

Claims

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Application Information

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IPC IPC(8): C01B25/36C01B25/40C08K3/32C09C1/40C09D5/00C09D7/12C09D11/00C09D11/02
Inventor 乔·德-布里托费尔南多·伽伦贝克雷纳托·罗塞托阿达莫-凯撒·马斯特兰格罗-阿马罗-多斯-桑托斯乔·德－布里托阿达莫－凯撒·马斯特兰格罗－阿马罗－多斯－桑托斯
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