CN104559342A - Titanium dioxide dispersing agent and process - Google Patents
Titanium dioxide dispersing agent and process Download PDFInfo
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- CN104559342A CN104559342A CN201310510589.5A CN201310510589A CN104559342A CN 104559342 A CN104559342 A CN 104559342A CN 201310510589 A CN201310510589 A CN 201310510589A CN 104559342 A CN104559342 A CN 104559342A
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- titanium dioxide
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Abstract
The invention belongs to the technical field of titanium dioxide treatment after production and relates to a titanium dioxide dispersing agent. The titanium dioxide dispersing agent comprises isopropanolamine, N-isopropyl acrylamide, silicone resin with a molecular weight of 600-800 and polycarbonate with a molecular weight 10,000-11,000. A titanium dioxide dispersing process comprises the following steps of: adding the dispersing agent into titanium dioxide obtained by calcining, dispersing the titanium dioxide uniformly in a wetting and dispersing tank, feeding the dispersed titanium dioxide into a sander, sanding into slurry, and treating the slurry chemically. The highest concentration of the titanium dioxide dispersed by the dispersing agent provided by the invention before being sanded is 1,600g/L, and the highest concentration of the titanium dioxide dispersed by other dispersing agents before being sanded is only 600g/L. By adopting the dispersing agent, the titanium dioxide sanding efficiency can be improved, the pH value of the titanium dioxide slurry can be kept around 9.0, the viscosity of a sanding material can be reduced significantly, the particle size of the titanium dioxide slurry obtained by sanding can be reduced significantly to 0.20-0.23mu m, and the high-quality slurry can be provided for the following chemical treatment step.
Description
technical field
The present invention relates to titanium white production post-processing technology field, particularly a kind of divided titanium dioxide powder, also relates to dispersing technology.
background technology
It is a very important link that TiO 2 pigment carried out wet-milling before chemical treatment; because though the TiO 2 pigment footpath after calcining is through Raymond mill; but still have the coarse particles of 1 ~ 10 of some amount μm or aggregate particles not to be pulverized; when particularly adopting Raymond mill; effect is rolled because of grinding roller; many pulverized fine particles press together and become agglomerative particle, need larger energy to separate when disperseing.Facts have proved that TiO 2 pigment exists more than 0.5 μm macrobead, the pigment performance indexs such as its opacifying power, tinting strength, bottom form and aspect have obvious decline.The effect of wet-milling is exactly when chemical treatment, removes above-mentioned macrobead, aggregate particles and agglomerative particle.Wet-milling is to concentration of slurry, viscosity, pH value, and dispersion state has certain requirement.The concentration of slurry general control of usual wet-milling titanium dioxide is at 600-1000g/L, PH:8-11.But in process of production, because the dispersion effect of dispersion agent used is undesirable, concentration of slurry is up to 600g/L, the viscosity of slurry is just very large, cannot continue to increase concentration.And the slurry viscosity after wet-milling is large, and fineness, still more than 0.3 μm, makes titanium dioxide opacifying power in use, tinting strength, cost all be affected.
summary of the invention
The problem that during in order to solve above titanium dioxide wet-milling, slurry concentration is low, wet-milling viscosity large, fineness is large after wet-milling, the invention provides a kind of divided titanium dioxide powder.
Present invention also offers described dispersing technology.
The present invention is achieved by the following measures:
A kind of divided titanium dioxide powder, containing α-amino isopropyl alcohol in described dispersion agent, containing NIPA, molecular weight is the silicone resin of 600-800, molecular weight is the polyphosphazene polymer carbonic ether of 10000-11000, the weight proportion 2:1:3:0.3 of α-amino isopropyl alcohol, NIPA, silicone resin, polyphosphazene polymer carbonic ether, the concentration of dispersion agent is 50-50.5wt%.
Described dispersion agent, for adding polyphosphazene polymer carbonic ether, silicone resin and α-amino isopropyl alcohol successively in container, adding NIPA after mixing, finally adding water and meeting the requirements of concentration, stir evenly obtained.
Improve a dispersing technology for wet-grinding efficiency of titanium white, be add dispersion agent in the titanium dioxide obtained to calcining, be uniformly dispersed in wetting and dispersing tank, enter sand mill defibrination, then carry out chemical treatment.
The add-on of described dispersion agent is 0.2% of titanium dioxide weight.
Sand mill refining concentration is 900-1600g/L, and the median size after mill is 0.20-0.23 μm.
When disperseing in wetting and dispersing tank, rotating speed is 25 revs/min.
The production capacity of sand mill is 3t/h.
Beneficial effect of the present invention:
1600g/L can be reached with the maximum concentration before dispersion agent sand milling of the present invention, and with other dispersion agent, the maximum concentration before sand milling can only reach 600g/L, improves the efficiency of sand milling; And pH is stabilized in about 9.0, the viscosity of sand milling material obviously reduces, and the particle diameter of the slip after sand milling has obvious reduction, can reach 0.20-0.23 μm, for subsequent processing chemical treatment provides the material base of high-quality.
Embodiment
For a better understanding of the present invention, further illustrate below in conjunction with specific embodiment.
embodiment 1:
Calcine the dispersion agent adding 0.2wt% in the titanium dioxide obtained, dispersion agent is α-amino isopropyl alcohol, in wetting and dispersing tank, 25 revs/min are uniformly dispersed, and the concentration of titanium dioxide is 900g/L, pH is 9.0, enter sand mill defibrination, the production capacity of sand mill is 3t/h, and obtaining particle diameter is 0.23 μm, the slurry of viscosity 0.8mPa.s, then carry out chemical treatment, obtain finished product titanium dioxide.
embodiment 2
Prepare dispersion agent: in container, add polyphosphazene polymer carbonic ether, silicone resin and α-amino isopropyl alcohol successively, NIPA is added after mixing, adding proportion α-amino isopropyl alcohol, NIPA, silicone resin, polyphosphazene polymer carbonic ether weight ratio 2:1:3:0.3, finally add the concentration that water reaches 50wt%, stir evenly.Silicone resin molecular weight is 600-800, and polymer polycarbonate molecular weight is 10000.
Calcine the dispersion agent adding 0.2wt% in the titanium dioxide obtained, in wetting and dispersing tank, 25 revs/min are uniformly dispersed, the concentration of titanium dioxide is 1000g/L, pH is 9.10, enters sand mill defibrination, and the production capacity of sand mill is 3t/h, obtaining particle diameter is 0.22 μm, the slurry of viscosity 0.7mPa.s, then carries out chemical treatment, obtains finished product titanium dioxide.
embodiment 3
Prepare dispersion agent: in container, add polyphosphazene polymer carbonic ether, silicone resin and α-amino isopropyl alcohol successively, NIPA is added after mixing, adding proportion α-amino isopropyl alcohol, NIPA, silicone resin, polyphosphazene polymer carbonic ether weight ratio 2:1:3:0.3, finally add the concentration that water reaches 50.5wt%, stir evenly.Silicone resin molecular weight is 800-1200, and polymer polycarbonate molecular weight is 11000.
Calcine the dispersion agent adding 0.2wt% in the titanium dioxide obtained, in wetting and dispersing tank, 25 revs/min are uniformly dispersed, the concentration of titanium dioxide can reach 1600g/L, pH is 9.12, enters sand mill defibrination, and the production capacity of sand mill is 3t/h, obtaining particle diameter is 0.21 μm, viscosity is the slurry of 0.65mPa.s, then carries out chemical treatment, obtains finished product titanium dioxide.
comparative example 1
Calcine the dispersion agent adding 0.2wt% in the titanium dioxide obtained, dispersion agent is conventional dispersion agent, and composition is monoethanolamine, Sodium hexametaphosphate 99, sodium hydroxide weight ratio 1:3:1.5.In wetting and dispersing tank, be uniformly dispersed 25 revs/min, the concentration of titanium dioxide is when reaching 500g/L, and pH is 8.7, enter sand mill defibrination, the production capacity of sand mill is 3t/h, and obtaining particle diameter is 0.34 μm, viscosity is the slurry of 1.009mPa.s, then carries out chemical treatment, obtains finished product titanium dioxide.
comparative example 2
Calcine the dispersion agent adding 0.2wt% in the titanium dioxide obtained, dispersion agent is conventional dispersion agent, and composition is monoethanolamine, Sodium hexametaphosphate 99, sodium hydroxide weight ratio 1.5:2.5:1.5.In wetting and dispersing tank, be uniformly dispersed 35 revs/min, the concentration of titanium dioxide is when reaching 550g/L, and pH is 8.72, enter sand mill defibrination, the production capacity of sand mill is 3t/h, and obtaining particle diameter is 0.33 μm, viscosity is the slurry of 1.004mPa.s, then carries out chemical treatment, obtains finished product titanium dioxide.
comparative example 3
Calcine the dispersion agent adding 0.2wt% in the titanium dioxide obtained, dispersion agent is conventional dispersion agent, and composition is monoethanolamine, Sodium hexametaphosphate 99, sodium hydroxide weight ratio 1.5:3.2:1.5.In wetting and dispersing tank, be uniformly dispersed 38 revs/min, the concentration of titanium dioxide is when reaching 600g/L, and pH is 8.9, enter sand mill defibrination, the production capacity of sand mill is 3t/h, and obtaining particle diameter is 0.31 μm, viscosity is the slurry of 1.0mPa.s, then carries out chemical treatment, obtains finished product titanium dioxide.
Under the whipped form and the duplicate situation of rotating speed of wetting making beating tank, use dispersion agent of the present invention, maximum concentration before sand milling can reach 1600g/L, and use original conventional dispersion agent, maximum concentration before sand milling can only reach 600g/L, and dispersion agent of the present invention makes pH be stabilized in about 9.0, and the viscosity of material obviously reduces, the particle diameter of the slip after sand milling is made to have obvious reduction, for subsequent processing chemical treatment provides the material base of high-quality.
Claims (7)
1. a divided titanium dioxide powder, is characterized in that molecular weight is the silicone resin of 600-800, and molecular weight is the polyphosphazene polymer carbonic ether of 10000-11000 containing α-amino isopropyl alcohol, NIPA in described dispersion agent,
The weight proportion 2:1:3:0.3 of α-amino isopropyl alcohol, NIPA, silicone resin, polyphosphazene polymer carbonic ether, the concentration of dispersion agent is 50-50.5wt%.
2. dispersion agent according to claim 1, is characterized in that adding polyphosphazene polymer carbonic ether, silicone resin and α-amino isopropyl alcohol successively in container, adds NIPA, finally add water and meet the requirements of concentration, stir evenly after mixing.
3. a dispersing technology for titanium dioxide, is characterized in that the dispersion agent added in the titanium dioxide obtained to calcining according to any one of claim 1-3, is uniformly dispersed in wetting and dispersing tank, enter sand mill defibrination, then carry out chemical treatment.
4. dispersing technology according to claim 3, is characterized in that the add-on of described dispersion agent is 0.2% of titanium dioxide weight.
5. the dispersing technology according to claim 3 or 4, is characterized in that sand mill refining concentration is 900-1600g/L, and the median size after mill is 0.20-0.23 μm.
6. the dispersing technology according to claim 3 or 4, when it is characterized in that disperseing in wetting and dispersing tank, rotating speed is 25 revs/min.
7. the dispersing technology according to claim 3 or 4, is characterized in that the production capacity of sand mill is 3t/h.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310510589.5A CN104559342A (en) | 2013-10-26 | 2013-10-26 | Titanium dioxide dispersing agent and process |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310510589.5A CN104559342A (en) | 2013-10-26 | 2013-10-26 | Titanium dioxide dispersing agent and process |
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| CN104559342A true CN104559342A (en) | 2015-04-29 |
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| CN201310510589.5A Pending CN104559342A (en) | 2013-10-26 | 2013-10-26 | Titanium dioxide dispersing agent and process |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104990843A (en) * | 2015-08-03 | 2015-10-21 | 攀钢集团钛业有限责任公司 | Method for detecting titanium dioxide oil-dispersing property |
| CN109517191A (en) * | 2018-11-16 | 2019-03-26 | 山东道安新材料有限公司 | A kind of highly stable Modified silicon oil emulsion |
-
2013
- 2013-10-26 CN CN201310510589.5A patent/CN104559342A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104990843A (en) * | 2015-08-03 | 2015-10-21 | 攀钢集团钛业有限责任公司 | Method for detecting titanium dioxide oil-dispersing property |
| CN104990843B (en) * | 2015-08-03 | 2017-07-07 | 攀钢集团钛业有限责任公司 | The method for detecting titanium dioxide oil-dispersing property |
| CN109517191A (en) * | 2018-11-16 | 2019-03-26 | 山东道安新材料有限公司 | A kind of highly stable Modified silicon oil emulsion |
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Application publication date: 20150429 |