CN102489217A - Dispersing agent and dispersing process for improving wet-grinding efficiency of titanium white powder - Google Patents
Dispersing agent and dispersing process for improving wet-grinding efficiency of titanium white powder Download PDFInfo
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- CN102489217A CN102489217A CN2011104287685A CN201110428768A CN102489217A CN 102489217 A CN102489217 A CN 102489217A CN 2011104287685 A CN2011104287685 A CN 2011104287685A CN 201110428768 A CN201110428768 A CN 201110428768A CN 102489217 A CN102489217 A CN 102489217A
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Abstract
The invention relates to a dispersing agent for improving the wet-grinding efficiency of titanium white powder and belongs to the technical field of post treatment in the production of titanium white powder. The dispersing agent comprises isopropanolamine, N-isopropylacrylamide, silicone resin with the molecular weight of 800-1200 and high-molecular polycarbonate with the molecular weight of 15000-19000. A dispersing process for improving the wet-grinding efficiency of the titanium white powder comprises the following steps of: adding the dispersing agent into the titanium white powder obtained by calcinations, dispersing uniformly in a wet dispersing tank, feeding into a grinder for grinding, and then carrying out chemical treatment. Before grinding, the highest concentration of the dispersing agent can reach 1600g/L, but for the other used dispersing agent, before grinding, the highest concentration of the dispersing agent only can reach 600g/L, so that the grinding efficiency is improved; and the pH is stable about 9.0, the viscosity of a ground material is obviously reduced, and the particle size of the ground slurry is obviously reduced and can reach 0.20-0.23mum, so that a high-grade material basis is provided for chemical treatment in a next procedure.
Description
Technical field
The present invention relates to titanium white production post-processing technology field, particularly a kind of dispersant that improves titanium white powder wet-milling efficient also relates to and improves the dispersing technology of titanium white powder wet-milling efficient.
Background technology
TiO 2 pigment carried out wet-milling before chemical treatment be an important link; Because though pulverize through Raymond mill in the TiO 2 pigment footpath after the calcining; But still have coarse granule or the aggregate particles of 1 ~ 10 μ m of some not to be pulverized, when particularly adopting Raymond mill to pulverize, because of the effect that rolls of grinding roller; Many pulverized fine graineds press together and become agglomerative particle, when disperseing, need bigger energy to separate.Facts have proved that there is the above bulky grain of 0.5 μ m in TiO 2 pigment, pigment performance indexs such as its covering power, tinting strength, tinting power, bottom form and aspect all have obvious decline.The effect of wet-milling is exactly when chemical treatment, removes above-mentioned bulky grain, aggregate particles and agglomerative particle.Wet-milling is to concentration of slurry, viscosity, pH value, and dispersity all has certain requirement.Usually the concentration of slurry of wet-milling titanium dioxide generally is controlled at 600-1000g/L, PH:8-11.But in process of production, because the dispersion effect of used dispersant is undesirable, concentration of slurry is up to 600g/L, and the viscosity of slurry is just very big, and can't continue has increased concentration.And the slurry viscosity after the wet-milling is big, and fineness still more than 0.3 μ m, all is affected titanium white powder covering power, tinting strength, tinting power, cost in use.
Summary of the invention
Slurry concentration is low when solving above titanium white powder wet-milling, wet-milling viscosity big, the big problem of fineness after the wet-milling, the invention provides a kind of dispersant that improves titanium white powder wet-milling efficient.
The present invention also provides the dispersing technology of said raising titanium white powder wet-milling efficient.
The present invention realizes through following measure:
A kind of dispersant that improves titanium white powder wet-milling efficient contains isopropanolamine in the said dispersant.
Said dispersant also contains the N-NIPA; Molecular weight is the silicone resin of 800-1200; Molecular weight is the polyphosphazene polymer carbonic ester of 15000-19000; The weight proportion 2:2:1:0.5-1 of isopropanolamine, N-NIPA, silicone resin, polyphosphazene polymer carbonic ester, the concentration of dispersant is 50-50.5wt%.
Described dispersant in container, adding polyphosphazene polymer carbonic ester, silicone resin and isopropanolamine successively, mixes the back and adds the N-NIPA, adds water at last and meets the requirements of concentration, stirs to make.
A kind of dispersing technology that improves titanium white powder wet-milling efficient is in the titanium white powder that calcining obtains, to add dispersant, in wetting dispersion tank, is uniformly dispersed, and gets into the sand mill defibrination, carries out chemical treatment then.
The addition of said dispersant is 0.2% of a titanium white powder weight.
The sand mill refining concentration is 900-1600g/L, and the average grain diameter behind the mill is 0.20-0.23 μ m.
Rotating speed is 25 rev/mins when in wetting dispersion tank, disperseing.
The production capacity of sand mill is 3t/h.
Beneficial effect of the present invention:
Maximum concentration with before the dispersant sand milling of the present invention can reach 1600g/L, and with other dispersant, the preceding maximum concentration of sand milling can only reach 600g/L, has improved the efficient of sand milling; And pH is stabilized in about 9.0, and the viscosity of sand milling material obviously reduces, and the particle diameter of the slip behind the sand milling has obvious reduction, can reach 0.20-0.23 μ m, and the material base of high-quality is provided for the subsequent processing chemical treatment.
The specific embodiment
For a better understanding of the present invention, further specify below in conjunction with specific embodiment.
Embodiment 1:
Add the dispersant of 0.2wt% in the titanium white powder that calcining obtains, dispersant is an isopropanolamine, and 25 rev/mins are uniformly dispersed in wetting dispersion tank; The concentration of titanium white powder is 900g/L, and pH is 9.0, gets into the sand mill defibrination; The production capacity of sand mill is 3t/h, and obtaining particle diameter is 0.23 μ m, the slurry of viscosity 0.8mPa.s; Carry out chemical treatment then, obtain the finished product titanium white powder.
Embodiment 2
Preparation dispersant: in container, add polyphosphazene polymer carbonic ester, silicone resin and isopropanolamine successively; Mix the back and add the N-NIPA; Adding proportion isopropanolamine, N-NIPA, silicone resin, polyphosphazene polymer carbonic ester weight ratio 2:2:1:0.5; Add the concentration that water reaches 50wt% at last, stir.The silicone resin molecular weight is 800-1200, and the macromolecule polycarbonate molecular weight is 15000-19000.
Add the dispersant of 0.2wt% in the titanium white powder that calcining obtains, 25 rev/mins are uniformly dispersed in wetting dispersion tank, and the concentration of titanium white powder is 1000g/L; PH is 9.10, gets into the sand mill defibrination, and the production capacity of sand mill is 3t/h; Obtaining particle diameter is 0.22 μ m; The slurry of viscosity 0.7mPa.s carries out chemical treatment then, obtains the finished product titanium white powder.
Embodiment 3
Preparation dispersant: in container, add polyphosphazene polymer carbonic ester, silicone resin and isopropanolamine successively; Mix the back and add the N-NIPA; Adding proportion isopropanolamine, N-NIPA, silicone resin, polyphosphazene polymer carbonic ester weight ratio 2:2:1:1; Add the concentration that water reaches 50.5wt% at last, stir.The silicone resin molecular weight is 800-1200, and the macromolecule polycarbonate molecular weight is 15000-19000.
Add the dispersant of 0.2wt% in the titanium white powder that calcining obtains, 25 rev/mins are uniformly dispersed in wetting dispersion tank, and the concentration of titanium white powder can reach 1600g/L; PH is 9.12, gets into the sand mill defibrination, and the production capacity of sand mill is 3t/h; Obtaining particle diameter is 0.21 μ m; Viscosity is the slurry of 0.65mPa.s, carries out chemical treatment then, obtains the finished product titanium white powder.
The comparative example 1
The dispersant that adds 0.2wt% in the titanium white powder that calcining obtains, dispersant is dispersant commonly used, composition is MEA, calgon, NaOH weight ratio 1:3:1.5.In wetting dispersion tank, be uniformly dispersed 25 rev/mins, the concentration of titanium white powder is when reaching 500g/L, and pH is 8.7; Get into the sand mill defibrination, the production capacity of sand mill is 3t/h, and obtaining particle diameter is 0.34 μ m; Viscosity is the slurry of 1.009mPa.s, carries out chemical treatment then, obtains the finished product titanium white powder.
The comparative example 2
The dispersant that adds 0.2wt% in the titanium white powder that calcining obtains, dispersant is dispersant commonly used, composition is MEA, calgon, NaOH weight ratio 1.5:2.5:1.5.In wetting dispersion tank, be uniformly dispersed 35 rev/mins, the concentration of titanium white powder is when reaching 550g/L, and pH is 8.72; Get into the sand mill defibrination, the production capacity of sand mill is 3t/h, and obtaining particle diameter is 0.33 μ m; Viscosity is the slurry of 1.004mPa.s, carries out chemical treatment then, obtains the finished product titanium white powder.
The comparative example 3
The dispersant that adds 0.2wt% in the titanium white powder that calcining obtains, dispersant is dispersant commonly used, composition is MEA, calgon, NaOH weight ratio 1.5:3.2:1.5.In wetting dispersion tank, be uniformly dispersed 38 rev/mins, the concentration of titanium white powder is when reaching 600g/L, and pH is 8.9; Get into the sand mill defibrination, the production capacity of sand mill is 3t/h, and obtaining particle diameter is 0.31 μ m; Viscosity is the slurry of 1.0mPa.s, carries out chemical treatment then, obtains the finished product titanium white powder.
Under the whipped form and the duplicate situation of rotating speed of wetting making beating jar, use dispersant of the present invention, the maximum concentration before the sand milling can reach 1600g/L; And the original dispersant commonly used of use; Maximum concentration before the sand milling can only reach 600g/L, and dispersant of the present invention is stabilized in about 9.0 pH, and the viscosity of material obviously reduces; Make the particle diameter of the slip behind the sand milling that obvious reduction arranged, the material base of high-quality is provided for the subsequent processing chemical treatment.
Claims (8)
1. a dispersant that improves titanium white powder wet-milling efficient is characterized in that containing isopropanolamine in the said dispersant.
2. dispersant according to claim 1 is characterized in that said dispersant also contains the N-NIPA, and molecular weight is the silicone resin of 800-1200, and molecular weight is the polyphosphazene polymer carbonic ester of 15000-19000,
The weight proportion 2:2:1:0.5-1 of isopropanolamine, N-NIPA, silicone resin, polyphosphazene polymer carbonic ester, the concentration of dispersant is 50-50.5wt%.
3. dispersant according to claim 2 is characterized in that in container, adding polyphosphazene polymer carbonic ester, silicone resin and isopropanolamine successively, mixes the back and adds the N-NIPA, adds water at last and meets the requirements of concentration, stirs.
4. a dispersing technology that improves titanium white powder wet-milling efficient is characterized in that in the titanium white powder that calcining obtains, adding each described dispersant among the claim 1-3, in wetting dispersion tank, is uniformly dispersed, and gets into the sand mill defibrination, carries out chemical treatment then.
5. dispersing technology according to claim 4, the addition that it is characterized in that said dispersant is 0.2% of a titanium white powder weight.
6. according to claim 4 or 5 described dispersing technologies, it is characterized in that the sand mill refining concentration is 900-1600g/L, the average grain diameter behind the mill is 0.20-0.23 μ m.
7. according to claim 4 or 5 described dispersing technologies, rotating speed is 25 rev/mins when it is characterized in that in wetting dispersion tank, disperseing.
8. according to claim 4 or 5 described dispersing technologies, the production capacity that it is characterized in that sand mill is 3t/h.
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| CN201110428768.5A CN102489217B (en) | 2011-12-20 | 2011-12-20 | Dispersing agent and dispersing process for improving wet-grinding efficiency of titanium white powder |
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| CN201110428768.5A CN102489217B (en) | 2011-12-20 | 2011-12-20 | Dispersing agent and dispersing process for improving wet-grinding efficiency of titanium white powder |
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| CN102489217A true CN102489217A (en) | 2012-06-13 |
| CN102489217B CN102489217B (en) | 2013-11-06 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104190313A (en) * | 2014-06-06 | 2014-12-10 | 济南裕兴化工有限责任公司 | A cost-reducing wetting dispersant used for titanium dioxide |
| CN104906995A (en) * | 2015-04-21 | 2015-09-16 | 江苏镇钛化工有限公司 | High-efficiency titanium dioxide beating composite dispersant and preparation method thereof |
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| DE69407741T2 (en) * | 1993-12-07 | 1998-04-16 | Tioxide Group Services Ltd | Titanium dioxide slurries |
| US5891231A (en) * | 1997-05-13 | 1999-04-06 | Lexmark International Inc. | Process for preparing pigment dispersions used in inks |
| CN102230236A (en) * | 2011-05-17 | 2011-11-02 | 上海瑞贝卡纤维材料科技有限公司 | Color paste for modified acrylic fiber wet raw liquor coloring system and preparation method thereof |
-
2011
- 2011-12-20 CN CN201110428768.5A patent/CN102489217B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE69407741T2 (en) * | 1993-12-07 | 1998-04-16 | Tioxide Group Services Ltd | Titanium dioxide slurries |
| US5891231A (en) * | 1997-05-13 | 1999-04-06 | Lexmark International Inc. | Process for preparing pigment dispersions used in inks |
| CN102230236A (en) * | 2011-05-17 | 2011-11-02 | 上海瑞贝卡纤维材料科技有限公司 | Color paste for modified acrylic fiber wet raw liquor coloring system and preparation method thereof |
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| D.SATAS: "《涂料涂装工艺应用手册》", 31 December 2003 * |
| 方道斌: "《丙烯酰胺聚合物》", 31 March 2006 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104190313A (en) * | 2014-06-06 | 2014-12-10 | 济南裕兴化工有限责任公司 | A cost-reducing wetting dispersant used for titanium dioxide |
| CN104190313B (en) * | 2014-06-06 | 2015-10-21 | 济南裕兴化工有限责任公司 | A kind of titanium dioxide wetting dispersing agent |
| CN104906995A (en) * | 2015-04-21 | 2015-09-16 | 江苏镇钛化工有限公司 | High-efficiency titanium dioxide beating composite dispersant and preparation method thereof |
| CN104906995B (en) * | 2015-04-21 | 2016-08-31 | 江苏镇钛化工有限公司 | A kind of efficient titanium making beating composite dispersing agent and preparation method thereof |
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| Publication number | Publication date |
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| CN102489217B (en) | 2013-11-06 |
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