CA1206392A - Tio.sub.2 slurries containing alkanolamines - Google Patents
Tio.sub.2 slurries containing alkanolaminesInfo
- Publication number
- CA1206392A CA1206392A CA000452818A CA452818A CA1206392A CA 1206392 A CA1206392 A CA 1206392A CA 000452818 A CA000452818 A CA 000452818A CA 452818 A CA452818 A CA 452818A CA 1206392 A CA1206392 A CA 1206392A
- Authority
- CA
- Canada
- Prior art keywords
- slurry
- tio2
- alkanolamines
- tio
- sub
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Abstract
TiO2 SLURRIES CONTAINING ALKANOLAMINES
ABSTRACT OF THE DISCLOSURE
The rheological stability and viscosity of aqueous slurries of TiO2 can be enhanced by the addition of certain alkanolamines.
ABSTRACT OF THE DISCLOSURE
The rheological stability and viscosity of aqueous slurries of TiO2 can be enhanced by the addition of certain alkanolamines.
Description
TiO2 SLURRIES CONTAINING ALKANOLAMINES
DESCRIPTION
Technical Field This invention relates to aqueous slurries of TiO2. It is more particularly directed to such slurries containing alkanolamines.
Back~round and Summary of the Invention For many applications~ TiO2 pigment is provided as an aqueous slurry. It is desirable that this slurry have good rheological stability and that it have low viscosity. In the past, these properties have been obtained by adding a polyelectrolyte to the slurry. This polyelectrolyte is adsorbed on the pig-ment surface, thus generating an electrical charge, which gives the slurry stability and low viscosityO
Adsorption of the polyelectrolyte, however, sometimes blocks the desirable adsorption of other materials on the surfaces of the pigment particles, and it would therefore be an advantage to be able to acquire rheological stability and low viscosity without using polyelectrolytes.
In the first aspect of the invention, it has now been found that this stability and low vis-cosity can be achieved by adding certain alkanol-amines to the TiO2 slurry, while keeping the slurry substantially free of polyelectrolytes. "Substan-tially free" means that the slurry is either com-pletely free of polyelectrolytes or contains only small and inconsequential amounts.
In a second aspect of the invention, it has ,~
3~2 been found that .if the alkanolamine is N-isopropyl-ethanolamine, N,N-diisopropylethanolamine or N-iso-propyldiethanolamine, one can obtain the improved rheology and viscosity even when pol.yelectrolytes are present, and that these slurries show surprisingly little corrosiveness to copper.
Detailed Description The alkanolamines used according to the first aspect of the invention are those represented by the structure (I) ( )n ( )2-n 2 2 where R is an alkyl radical of 1-4 carbon atoms and n is 1 or 2.
N-methylethanolamine and N,N-dimethylethanolamine are preferred.
All of the alkanolamines used according to the i.nvention are available in the marketplaceJ
The TiO2 used to prepare a slurry of the invention can be of the conventional rutile vaeiety, prepared by either the chloride or the sulfate pro-cess~ The TiO2 particles can be conventionally coated with alum.ina, with silica, or with aluminasilica.
A slurry of the invention may be made by simultaneously adding to water enough TiO2 and ~206;3~
enough of ~he desired amine, with stirringt to give a slurry containing ~5-82%, by weight~ of TiO2 and having a pH of 8.5-11, preferably 9. 5-lOo 5~ The slurry is stirred vigorously, and enough water and amine are then added to reduce the solids content of the slurry to 60-80%, by weight, and to bring its p~
to about the original adjusted value. The slurry is then filtered or screened to remove undesirable grit pa~ticles, and the slurry is then ready for use.
If the slurry is being prepared according to the first aspect of the invention, care should be taken to make sure that polyelectrolytes are kept out.
EXAMæLES
In the following examples, all parts are by weight.
Example 1 To 210 parts of water were added~ with stirring, 850 parts of rutile TiO2 and enough N-methylethanolamine to bring the pH of the slurry to 9.8. The slurry was stirred vigorously for 10 minutes and to it were then added 4~.6 parts of water and enough of the amine to brin~ the pH back to 9.8.
The slurry was then stirred for 10 minutes more and screened to remove grit.
The resulting slur ry had a Brookfiel~
viscosity (100 rpm ~ 22C) of 113 centipoise.
Example 2 A slurry was prepared as in Example 1, using N,N-dimethyle~hanolamine to bring the pH of the slurry to 9.8.
The resulting slurry had a Brookfield 35 viscosity (100 rpm @ 22CC) of 120 centipoise.
*denotes trade mark ~Z~?~3~Z~
Example 3 A slurry was prepared as in Example 1, using N-isopropylethanolamine to bring the pH of the slurry to 9.8~
The resulting slurry had a ~rookfield viscosity (100 rpm @ 22C~ of 115 centipoise.
Example 4 A slurry was prepared as in Example 1, using N,N-diisopropylethanolamine to bring the pH of the slurry to 10.2O
The resulting slurry had a Brookfield viscosity (100 rpm @ 22C) of 94 centipoise.
DESCRIPTION
Technical Field This invention relates to aqueous slurries of TiO2. It is more particularly directed to such slurries containing alkanolamines.
Back~round and Summary of the Invention For many applications~ TiO2 pigment is provided as an aqueous slurry. It is desirable that this slurry have good rheological stability and that it have low viscosity. In the past, these properties have been obtained by adding a polyelectrolyte to the slurry. This polyelectrolyte is adsorbed on the pig-ment surface, thus generating an electrical charge, which gives the slurry stability and low viscosityO
Adsorption of the polyelectrolyte, however, sometimes blocks the desirable adsorption of other materials on the surfaces of the pigment particles, and it would therefore be an advantage to be able to acquire rheological stability and low viscosity without using polyelectrolytes.
In the first aspect of the invention, it has now been found that this stability and low vis-cosity can be achieved by adding certain alkanol-amines to the TiO2 slurry, while keeping the slurry substantially free of polyelectrolytes. "Substan-tially free" means that the slurry is either com-pletely free of polyelectrolytes or contains only small and inconsequential amounts.
In a second aspect of the invention, it has ,~
3~2 been found that .if the alkanolamine is N-isopropyl-ethanolamine, N,N-diisopropylethanolamine or N-iso-propyldiethanolamine, one can obtain the improved rheology and viscosity even when pol.yelectrolytes are present, and that these slurries show surprisingly little corrosiveness to copper.
Detailed Description The alkanolamines used according to the first aspect of the invention are those represented by the structure (I) ( )n ( )2-n 2 2 where R is an alkyl radical of 1-4 carbon atoms and n is 1 or 2.
N-methylethanolamine and N,N-dimethylethanolamine are preferred.
All of the alkanolamines used according to the i.nvention are available in the marketplaceJ
The TiO2 used to prepare a slurry of the invention can be of the conventional rutile vaeiety, prepared by either the chloride or the sulfate pro-cess~ The TiO2 particles can be conventionally coated with alum.ina, with silica, or with aluminasilica.
A slurry of the invention may be made by simultaneously adding to water enough TiO2 and ~206;3~
enough of ~he desired amine, with stirringt to give a slurry containing ~5-82%, by weight~ of TiO2 and having a pH of 8.5-11, preferably 9. 5-lOo 5~ The slurry is stirred vigorously, and enough water and amine are then added to reduce the solids content of the slurry to 60-80%, by weight, and to bring its p~
to about the original adjusted value. The slurry is then filtered or screened to remove undesirable grit pa~ticles, and the slurry is then ready for use.
If the slurry is being prepared according to the first aspect of the invention, care should be taken to make sure that polyelectrolytes are kept out.
EXAMæLES
In the following examples, all parts are by weight.
Example 1 To 210 parts of water were added~ with stirring, 850 parts of rutile TiO2 and enough N-methylethanolamine to bring the pH of the slurry to 9.8. The slurry was stirred vigorously for 10 minutes and to it were then added 4~.6 parts of water and enough of the amine to brin~ the pH back to 9.8.
The slurry was then stirred for 10 minutes more and screened to remove grit.
The resulting slur ry had a Brookfiel~
viscosity (100 rpm ~ 22C) of 113 centipoise.
Example 2 A slurry was prepared as in Example 1, using N,N-dimethyle~hanolamine to bring the pH of the slurry to 9.8.
The resulting slurry had a Brookfield 35 viscosity (100 rpm @ 22CC) of 120 centipoise.
*denotes trade mark ~Z~?~3~Z~
Example 3 A slurry was prepared as in Example 1, using N-isopropylethanolamine to bring the pH of the slurry to 9.8~
The resulting slurry had a ~rookfield viscosity (100 rpm @ 22C~ of 115 centipoise.
Example 4 A slurry was prepared as in Example 1, using N,N-diisopropylethanolamine to bring the pH of the slurry to 10.2O
The resulting slurry had a Brookfield viscosity (100 rpm @ 22C) of 94 centipoise.
Claims (3)
1. An aqueous slurry substantially free of polyelectrolytes and consisting essentially of water, TiO2 particles and an amine represented by the structure (R)n-N(H)2-nCH2-CH2-OH
where R is an alkyl radical of 1-4 carbon atoms and n is 1 or 2, the slurry having a pH of 8.5-11.
where R is an alkyl radical of 1-4 carbon atoms and n is 1 or 2, the slurry having a pH of 8.5-11.
2. The slurry of claim 1 wherein the amine is N-methylethanolamine or N,N-dimethylethanolamine.
3. An aqueous slurry comprising TiO2 particles and N-isopropylethanolamine, N,N-diiso-propylethanolamine or N-isopropyldiethanolamine, the slurry having a pH of about 8.5-11.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US49022683A | 1983-04-29 | 1983-04-29 | |
| US490,226 | 1983-04-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1206392A true CA1206392A (en) | 1986-06-24 |
Family
ID=23947146
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000452818A Expired CA1206392A (en) | 1983-04-29 | 1984-04-26 | Tio.sub.2 slurries containing alkanolamines |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1206392A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5106549A (en) * | 1989-03-23 | 1992-04-21 | Shell Oil Company | Titania extrudates |
-
1984
- 1984-04-26 CA CA000452818A patent/CA1206392A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5106549A (en) * | 1989-03-23 | 1992-04-21 | Shell Oil Company | Titania extrudates |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |