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Aluminum phosphate or polyphosphate particles for use as pigments in paints and method of making same

a technology of aluminum phosphate and polyphosphate, which is applied in the direction of phosphates, phosphorus oxyacids, phosphates, etc., can solve the problems of high cost of titanium dioxide pigment manufacturing, difficult to obtain refraction indices of its two forms, anatase and rutile, and limited options for pigment or paint manufacturing processes that result in a film containing “pores” in the internal part of the particle or between the particle and the resin

Inactive Publication Date: 2006-03-02
BUNGE AMORPHIC SOLUTIONS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, titanium dioxide is known to be an expensive pigment to manufacture.
However, the refraction indices of its two forms, anatase and rutile, are difficult to obtain by other white solid substances (Handbook of Chemistry and Physics, CRC Press, 57th ed., 1983).
The current options for manufacturing processes of pigments or paints that result in a film containing “pores” in the internal part of the particles or between the particles and the resin is also quite limited.
Many of these methods yield highly porous and crystalline forms and few thermally stable amorphous compositions.

Method used

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  • Aluminum phosphate or polyphosphate particles for use as pigments in paints and method of making same
  • Aluminum phosphate or polyphosphate particles for use as pigments in paints and method of making same
  • Aluminum phosphate or polyphosphate particles for use as pigments in paints and method of making same

Examples

Experimental program
Comparison scheme
Effect test

example no.1

EXAMPLE NO. 1

[0063] In this example, 535.0 kg of aluminum phosphate was prepared. The wet product was dried in a “turbo-dryer” and presented characteristics of hollow particles with 15% humidity and P:Al (phosphorus:aluminum) ratio of 1:1.50.

[0064] 940.0 kg of fertilizer phosphoric acid containing 55.0% of P2O5 was prepared. In the initial preparation phase, the acid discoloration was carried out, which lasted approximately thirty minutes, at a temperature of 85° C. For this phase, a solution with 8.70 kg of hydrogen peroxide containing around 50% of H2O2 was added to the acid. Then, the acid was diluted with 975.0 kg of process water, cooled to a temperature of 40° C. and then stored at the concentration of 27.0% of P2O5.

[0065] The aluminum source employed in this application was a commercial aluminum sulfate solution containing 28% of Al2O3. The solution was filtered and diluted with process water. Specifically, 884.30 kg of aluminum sulfate solution and 1,776.31 kg of process w...

example no.2

EXAMPLE NO. 2

[0070] From the results of Example No. 1, around 200 kg of dried and micronized aluminum phosphate was used. The sample was used for the manufacturing of a home paint sample. Initially, 900 liters of opaque white acrylic paint was prepared. Such paint was applied and the performance was evaluated in comparison with one of a commercially available paint. The basic composition of the paint based on an original formulation containing around 18% of titanium dioxide was as follows: aluminum phosphate was approximately 14.20%; titanium oxide was approximately 8.34%; kaolin was approximately 7.10%; algamatolite was approximately 10.36%; diatomite was approximately 0.84%; acrylic resin was approximately 12.25%, and PVC was approximately 47.45%. The characteristics of the paint prepared with aluminum phosphate, after the application of it in painting, was the as follows: a) wet coverage similar to the reference paint coverage; b) dry coverage was better than the coverage with th...

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Abstract

An aluminum phosphate or polyphosphate-based pigment product is made by a process comprising contacting phosphoric acid with aluminum sulfate and an alkaline solution to produce an aluminum phosphate based product; and optionally calcining the aluminum phosphate based product at an elevated temperature, wherein the process is substantially free of an organic acid. The aluminum phosphate or polyphosphate-based pigment is amorphous. The amorphous aluminum phosphate or polyphosphate characterized by a bulk density of less than 2.30 grams per cubic centimeter and a phosphorus to aluminum mole ratio of greater than 0.8. The composition is useful in paints and as a substitute for titanium dioxide.

Description

PRIOR RELATED APPLICATIONS [0001] This application claims priority to Application No. PI0403713-8, filed in Brazil on Aug. 30, 2004, the disclosure of which is incorporated by reference herein in its entirety. FEDERALLY SPONSORED RESEARCH STATEMENT [0002] Not applicable. REFERENCE TO MICROFICHE APPENDIX [0003] Not applicable. FIELD OF THE INVENTION [0004] The invention relates to methods of making hollow particles of aluminum phosphate, aluminum orthophosphate and aluminum polyphosphate. This invention further relates to use of such particles as pigments in paints. BACKGROUND OF THE INVENTION [0005] Titanium dioxide is the most common white pigment due to its strong ability to backscatter visible light, which is in turn dependent on its refractive index. Substitutes for titanium dioxide have been sought, but the refractive indexes of both the anatase and rutile forms of this oxide are much higher than those of any other white powder, due to structural reasons. [0006] Titanium dioxid...

Claims

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Application Information

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IPC IPC(8): C01B25/26C09C1/40C01B25/36C09C3/04
CPCC01B25/40C01B25/36C01B25/45B82Y40/00C09C1/40C08K3/32C08K2003/327
Inventor GALEMBECK, FERNANDODE BRITO, JOAO
Owner BUNGE AMORPHIC SOLUTIONS
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