CN103436054B - Low viscosity enveloping method of titanium dioxide - Google Patents
Low viscosity enveloping method of titanium dioxide Download PDFInfo
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- CN103436054B CN103436054B CN201310384466.1A CN201310384466A CN103436054B CN 103436054 B CN103436054 B CN 103436054B CN 201310384466 A CN201310384466 A CN 201310384466A CN 103436054 B CN103436054 B CN 103436054B
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Abstract
The invention provides a low viscosity enveloping method of titanium dioxide. The method comprises the following steps: adding a dispersant into titanium dioxide slurry; adding zirconium sulfate liquor and curing, wherein the mass ratio of the added zirconium sulfate liquor is calculated based on the ZrO2, and the mass ratio of ZrO2 ZrO2 and TiO2 in the titanium dioxide slurry is (0.2:100)-(0.5:100); adding sodium metaaluminate liquid to control the pH value of the slurry within 7.0-11.0 and curing; adding aluminum sulfate liquor to control the pH value of the slurry within 2.5-6.5, and curing; adding sodium metaaluminate liquor to control the pH value of the slurry within 8.5-10.5, and curing; and adjusting the pH value of the slurry within 7.0-8.07.8, and curing. According to the method provided by the invention, the viscosity of the enveloping process is effectively reduced by adding the dispersant to improve the dispersing condition of the titanium dioxide slurry before enveloping and adopting a special enveloping process, so that the enveloping agent is uniformly deposited on the surface of titanium dioxide beneficially so as to improve the enveloping uniformity, thereby improving the brightness and dispersity of the product.
Description
Technical field
The present invention relates to a kind of coating method of titanium dioxide, specifically, the present invention relates to a kind of coating process that can lower coating process viscosity.
Background technology
Titanium dioxide, as a kind of white pigment, is widely used in the fields such as coating, plastics, ink.If rutile titanium white powder need obtain the excellent application performance such as good weathering resistance, dispersiveness, have to pass through inorganic surface treatment, at its uniformly coated one deck inorganic oxide film.
But, according to current pertinent literature and patent report, not yet occur about reducing coating process viscosity to improve the method for coating process dispersiveness and brightness.
Summary of the invention
For the deficiencies in the prior art, an object of the present invention is to solve in above-mentioned prior art the one or more problems existed.
An object of the present invention is to provide a kind of viscosity in reduction coating process, improve the homogeneity of coating and can improve the brightness of product and the coating method of dispersiveness.
To achieve these goals, the invention provides a kind of low viscosity coating method of titanium dioxide.Said method comprising the steps of: a, in Titanium dioxide slurry, add dispersion agent; B, add zirconium sulfate solution and slaking, wherein, the zirconium sulfate solution added is with ZrO
2meter and TiO in Titanium dioxide slurry
2mass ratio be 0.2:100 ~ 0.5:100; C, add sodium aluminate solution to control 7.0 ~ 11.0 by the pH value of slurry, slaking; D, add alum liquor to control 2.5 ~ 6.5 by the pH value of slurry, slaking; E, add sodium aluminate solution to control 8.5 ~ 10.5 by the pH value of slurry, slaking; The pH value of f, adjustment slurry is 7.0 ~ 7.8, slaking.
According to an embodiment of the low viscosity coating method of titanium dioxide of the present invention, the concentration of described Titanium dioxide slurry is 260 ~ 350g/l.
According to an embodiment of the low viscosity coating method of titanium dioxide of the present invention, the concentration of described titanium white slurry is 280 ~ 300g/l.
According to an embodiment of the low viscosity coating method of titanium dioxide of the present invention, the temperature of described titanium white slurry is 50 ~ 90 DEG C.
According to an embodiment of the low viscosity coating method of titanium dioxide of the present invention, the temperature of described titanium white slurry is 60 ~ 70 DEG C.
According to an embodiment of the low viscosity coating method of titanium dioxide of the present invention, described dispersion agent is one or more in water glass, Sodium hexametaphosphate 99, trisodium phosphate, potassium pyrophosphate, monoethanolamine ammonium, primary ammonium phosphate.
According to an embodiment of the low viscosity coating method of titanium dioxide of the present invention, the add-on of described dispersion agent is TiO in described Titanium dioxide slurry
20.05 ~ 0.25% of quality.
According to an embodiment of the low viscosity coating method of titanium dioxide of the present invention, the add-on of described dispersion agent is TiO in Titanium dioxide slurry
20.10 ~ 0.15% of quality.
According to an embodiment of the low viscosity coating method of titanium dioxide of the present invention, the sodium metaaluminate added in described step c is with Al
2o
3count TiO in Titanium dioxide slurry
20.20 ~ 0.6% of quality, described in the Tai-Ace S 150 that adds with Al
2o
3count TiO in Titanium dioxide slurry
20.45 ~ 1.65% of quality, the sodium metaaluminate added in described step e is with Al
2o
3count TiO in Titanium dioxide slurry
20.40 ~ 1.8% of quality.
According to an embodiment of the low viscosity coating method of titanium dioxide of the present invention, in described step c, the pH value of slurry is controlled 8.0 ~ 10.5.
Compared with prior art, beneficial effect of the present invention comprises: the dispersion situation improving Titanium dioxide slurry by adding dispersion agent before coating, and adopt special coating process, the viscosity of effective attenuating coating process, improve coating process dispersed, be beneficial to coating agent at titanium dioxide surface uniform deposition, improve the homogeneity of coating, thus improve brightness and the dispersiveness of product.
Embodiment
Hereinafter, the low viscosity coating method of titanium dioxide of the present invention will be described in detail in conjunction with exemplary embodiment.In the present invention, if do not have the statement made an exception, then in the material usually mentioned, the content of each element or composition is all mass percentage.
The low viscosity coating method of titanium dioxide comprises the following steps according to an exemplary embodiment of the present invention:
A, in Titanium dioxide slurry, add dispersion agent, stir.
Wherein the concentration of Titanium dioxide slurry is 260 ~ 350g/l, is preferably 280 ~ 300g/l.The temperature of titanium white slurry is 50 ~ 90 DEG C, is preferably 60 ~ 75 DEG C.Add the dispersion situation that dispersion agent can improve Titanium dioxide slurry.Dispersion agent is one or more in water glass, Sodium hexametaphosphate 99, trisodium phosphate, potassium pyrophosphate, monoethanolamine ammonium, primary ammonium phosphate.The add-on of dispersion agent is TiO in Titanium dioxide slurry
20.05 ~ 0.25% of quality, optimum add-on is 0.10 ~ 0.15%.
B, add zirconium sulfate solution and slaking, wherein, the zirconium sulfate solution added is with ZrO
2meter and TiO in Titanium dioxide slurry
2mass ratio be 0.25:100 ~ 0.5:100.By ZrO
2: TiO
2mass ratio controls within the scope of this, can improve product brightness and weathering resistance.
C, add sodium aluminate solution to control 7.0 ~ 11.0 by the pH value of slurry, slaking.
Wherein, the sodium metaaluminate added is with Al
2o
3count TiO in Titanium dioxide slurry
20.20 ~ 0.60% of quality.In this step, the pH value of slurry is adjusted to 7.0 ~ 11.0 by the sodium metaaluminate added, and can improve the dispersiveness of titanium dioxide in system, reduces slurry viscosity.Preferably, the pH value of slurry is controlled to be 8.0 ~ 10.5.
D, add alum liquor to control 2.5 ~ 6.5 by the pH value of slurry, slaking.
Wherein, the Tai-Ace S 150 added is with Al
2o
3count TiO in Titanium dioxide slurry
20.45 ~ 1.65% of quality.In this step, can ensure that the coating quantity of aluminium is more than 3.0%, and the cost of Tai-Ace S 150 is lower than sodium metaaluminate.
E, add sodium aluminate solution to control 8.5 ~ 10.5 by the pH value of slurry, slaking.
Wherein, the sodium metaaluminate added is with Al
2o
3count TiO in Titanium dioxide slurry
20.40 ~ 1.8% of quality.In this step, the object that the pH value of slurry controls 8.5 ~ 10.5 is by the sodium metaaluminate again added: the aluminium deposited in the basic conditions is boehmite-type, can improve the dispersiveness of product.
The pH value of f, adjustment slurry is 7.0 ~ 7.8, slaking.Such as, employing mass concentration is diluted acid adjust ph to 7.0 ~ 7.8 of 10 ~ 20%.In this step, the object pH value of slurry being adjusted to 7.0 ~ 7.8 ensures that the finished product are for neutral.
G, filtration, washing, drying, pulverizing, obtain titanium dioxide product.
Method of the present invention by adding the dispersion situation that dispersion agent improves Titanium dioxide slurry before coating, and adopt special coating process, effectively lower the viscosity of coating process, be conducive to coating agent at titanium dioxide surface uniform deposition, improve the homogeneity of coating, thus improve brightness and the dispersiveness of product.
In order to understand above-mentioned exemplary embodiment of the present invention better, below in conjunction with concrete example, it is further described.
Example 1
Get the rutile titanium white first product of the non-aftertreatment of 200g, with de-salted water making beating, the Titanium dioxide slurry concentration after making beating is 330g/l, Titanium dioxide slurry is heated to 60 DEG C; Added by Sodium hexametaphosphate 99 in the slurry after described heating, stir, wherein, the add-on of sodium hexametaphosphate dispersant is TiO
20.08% of quality; Add zirconium sulfate solution, the mass ratio adding zirconium sulfate solution is ZrO
2: TiO
2=0.25:100, slaking 30min, wherein; Add sodium aluminate solution, wherein, the add-on of sodium metaaluminate is with Al
2o
3for TiO
20.25% of quality, the pH value adding disposed slurry is 7.5, slaking 30min; Add alum liquor, wherein, the add-on of Tai-Ace S 150 is with Al
2o
3for TiO
21.65% of quality, the pH value of slurry is 2.68, slaking 60min; Add sodium aluminate solution, the add-on of sodium metaaluminate is with Al
2o
3for TiO
21.4% of quality, the pH value controlling slurry is 10.5, slaking 60min; Use concentration be by percentage to the quality 10 ~ 20% diluted acid regulation system pH value be 7.3, slaking 120min.By above-mentioned solution filtration, washing, dry, pulverizing, obtain titanium dioxide product.Coating process viscosity is at below 300cp, and detecting titanium dioxide brightness is 95.1%, and dispersiveness is 6.50HB.
Example 2
Get the rutile titanium white first product of the non-aftertreatment of 200g, with de-salted water making beating, the Titanium dioxide slurry concentration after making beating is 260g/l, Titanium dioxide slurry is heated to 80 DEG C; Be incorporated in the slurry heated by Sodium hexametaphosphate 99, stir, wherein, the add-on of sodium hexametaphosphate dispersant is TiO
20.25% of quality; Add a certain amount of zirconium sulfate solution, the mass ratio adding zirconium sulfate solution is ZrO
2: TiO
2=0.4:100, slaking 30min; Add sodium aluminate solution, wherein, the add-on of sodium metaaluminate is with Al
2o
3for TiO
20.60% of quality, the pH value adding disposed slurry is 10.5, slaking 30min; Add alum liquor, wherein, the add-on of Tai-Ace S 150 is with Al
2o
3for TiO
21.25% of quality, the pH value of slurry is 6.35, slaking 60min; Add sodium aluminate solution, the add-on of sodium metaaluminate is with Al
2o
3for TiO
21.4% of quality, the pH value of slurry is 8.5, slaking 60min; Use concentration be by percentage to the quality 10 ~ 20% diluted acid regulation system pH value be 7.5, slaking 120min.By above-mentioned solution filtration, washing, dry, pulverizing, obtain titanium dioxide product.Coating process viscosity is at below 300cp, and detecting titanium dioxide brightness is 95.2%, and dispersiveness is 6.25HB.
Example 3
Get the rutile titanium white first product of the non-aftertreatment of 200g, with de-salted water making beating, the Titanium dioxide slurry concentration after making beating is 300g/l, Titanium dioxide slurry is heated to 50 DEG C; Be incorporated in the slurry heated by Sodium hexametaphosphate 99, stir, wherein, the add-on of sodium hexametaphosphate dispersant is TiO
20.15% of quality; Add a certain amount of zirconium sulfate solution, the mass ratio adding zirconium sulfate is ZrO
2: TiO
2=0.5:100, slaking 30min; Add sodium aluminate solution, wherein, the add-on of sodium metaaluminate is with Al
2o
3for TiO
20.4% of quality, the pH value adding disposed slurry is 9.0, slaking 30min; Add alum liquor, wherein, the add-on of Tai-Ace S 150 is with Al
2o
3for TiO
21.55% of quality, the pH value of slurry is 3.0, slaking 60min; Add sodium aluminate solution, the add-on of sodium metaaluminate is with Al
2o
3for TiO
21.65% of quality, the pH value of slurry is 10.0, slaking 60min; Use concentration be by percentage to the quality 10% ~ 20% diluted acid regulation system pH value be 7.6, slaking 120min.By above-mentioned solution filtration, washing, dry, pulverizing, obtain titanium dioxide product.Coating process viscosity is at below 300cp, and detecting titanium dioxide brightness is 95.3%, and dispersiveness is 6.50HB.
In sum, of the present invention by adding the dispersion situation that dispersion agent improves Titanium dioxide slurry before coating, and adopt special coating process, the viscosity of effective attenuating coating process, improve coating process dispersed, in coating process, titanium dioxide is the dispersion in single particle equably, coating agent energy uniform deposition on single titanium dioxide granule surface, the thus titanium dioxide good brightness, dispersed high that goes out of coating.
Although above by describing the present invention in conjunction with exemplary embodiment, it will be apparent to those skilled in the art that when not departing from the spirit and scope that claim limits, various amendment and change can be carried out to exemplary embodiment of the present invention.
Claims (10)
1. a low viscosity coating method for titanium dioxide, is characterized in that, described method adopts following steps:
A, in Titanium dioxide slurry, add dispersion agent;
B, add zirconium sulfate solution and slaking, wherein, the zirconium sulfate solution added is with ZrO
2meter and TiO in Titanium dioxide slurry
2mass ratio be 0.25:100 ~ 0.5:100;
C, add sodium aluminate solution to control 7.0 ~ 10.5 by the pH value of slurry, slaking;
D, add alum liquor to control 2.5 ~ 6.5 by the pH value of slurry, slaking;
E, add sodium aluminate solution to control 8.5 ~ 10.5 by the pH value of slurry, slaking;
The pH value of f, adjustment slurry is 7.0 ~ 7.8, slaking;
G, filtration, washing, drying, pulverizing, obtain titanium dioxide product.
2. the low viscosity coating method of titanium dioxide according to claim 1, is characterized in that, the concentration of described Titanium dioxide slurry is 260 ~ 350g/l.
3. the low viscosity coating method of titanium dioxide according to claim 1, is characterized in that, the concentration of described titanium white slurry is 280 ~ 300g/l.
4. the low viscosity coating method of titanium dioxide according to claim 1, is characterized in that, the temperature of described titanium white slurry is 50 ~ 90 DEG C.
5. the low viscosity coating method of titanium dioxide according to claim 1, is characterized in that, the temperature of described titanium white slurry is 60 ~ 70 DEG C.
6. the low viscosity coating method of titanium dioxide according to claim 1, is characterized in that, described dispersion agent is one or more in water glass, trisodium phosphate, potassium pyrophosphate, monoethanolamine ammonium, primary ammonium phosphate.
7. the low viscosity coating method of titanium dioxide according to claim 1, is characterized in that, the add-on of described dispersion agent is TiO in described Titanium dioxide slurry
20.05 ~ 0.25% of quality.
8. the low viscosity coating method of titanium dioxide according to claim 1, is characterized in that, the add-on of described dispersion agent is TiO in Titanium dioxide slurry
20.10 ~ 0.15% of quality.
9. the low viscosity coating method of titanium dioxide according to claim 1, is characterized in that, the sodium metaaluminate added in described step c is with Al
2o
3count TiO in Titanium dioxide slurry
20.20 ~ 0.60% of quality, described in the Tai-Ace S 150 that adds with Al
2o
3count TiO in Titanium dioxide slurry
20.45 ~ 1.65% of quality, the sodium metaaluminate added in described step e is with Al
2o
3count TiO in Titanium dioxide slurry
20.40 ~ 1.8% of quality.
10. the low viscosity coating method of titanium dioxide according to claim 1, is characterized in that, in described step c controls the pH value of slurry 8.0 ~ 10.5.
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