CN102190910B - Surface treatment method for titanium white powder with dense composite film - Google Patents
Surface treatment method for titanium white powder with dense composite film Download PDFInfo
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- CN102190910B CN102190910B CN 201010120761 CN201010120761A CN102190910B CN 102190910 B CN102190910 B CN 102190910B CN 201010120761 CN201010120761 CN 201010120761 CN 201010120761 A CN201010120761 A CN 201010120761A CN 102190910 B CN102190910 B CN 102190910B
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Abstract
The invention provides a surface treatment method for rutile titanium white powder with dense composite films, which breaks through a traditional dense film coating treatment thought, realizes the innovation of an integral process of a plant through controlling the coating temperature, concentration, speed, pH value and the like based on the theory of improving slurry stirring intensity and lowering coating temperature, simplifies process and lowers production cost. The rutile titanium white powder produced by the invention has a smooth, uniform, continuous and dense film layer, and the weather resistance of the rutile titanium white powder reaches the level of international similar products.
Description
Technical field
The present invention relates to a kind of surface treatment method of titanium dioxide, specifically the surface treatment method of the fine and close composite membrane titanium dioxide of a kind of rutile-type.
Background technology
Titanium dioxide is a kind of white inorganic pigment, have nontoxic, best opacity, best whiteness and luminance brightness, be considered to the present best a kind of white pigment of performance in the world, be widely used in industry such as coating, plastics, papermaking, printing-ink, chemical fibre, rubber, makeup.Yet no matter be chlorination process, or the Rutile type Titanium Dioxide of Production By Sulfuric Acid Process, make color beautiful colorful for giving full play to its good optical property, and have good weathering resistance, ageing resistance and have good chemical stability, all need titanium dioxide is carried out inorganic and organic surface treatment.It is exactly the film that coats the inorganic hydrous oxide of one deck at the titanium dioxide particle surface that inorganic surfaces is handled, and therefore inorganic processing claims coating again, and it plays coating, shields light-catalysed effect, improves weathering resistance and the chalking resistance of titanium dioxide.The industrial treatment agent of normal use is four kinds of silicon, aluminium, zirconium, titanium, though the inorganic agent type is few, but treatment process is ever-changing, it is most important, the most complicated in a titanium white powder pigment surface treatment process link, the inorganic surfaces of titanium dioxide is handled very big to the performance impact of titanium dioxide product, being the main measure that changes the titanium dioxide surface properties, also is titanium dioxide surface-treated emphasis.
Coating is divided into dense film and porous-film by the film layer structure difference, and the kind by adding the coating agent can be divided into single coating and composite coated.Titanium dioxide weathering resistance behind the fine and close coating is good especially, and it brings up to a new height with the weather resistance of titanium dioxide, is usually used in the enamel paint of high gloss, high-durability and plastics etc.This film can also protect TiO 2 particles not corroded by chemical.For example, press the titanium dioxide that well-established law coats with sial, heating (175 ℃) in 96% sulfuric acid, 5 hours has 95% titanium dioxide dissolved, and behind fine and close coating, under the similarity condition, has only 20～40% dissolvings.
Prior art thinks, can generate dense film in the industrial production main relevant with following factors: 1, titania slurry concentration can not be too high, with 100～300g/l for well; 2, titania slurry pH value should remain on 8～11, is preferably 9.5～11; 3, the titania slurry temperature should keep 80～100 ℃; 4, the reaction times of dense film longer, generally reach 5～10 hours; 5, the titania slurry dispersion state will be got well, and stirring intensity can not be peaceful slow, but can not be too big, and is too fierce, otherwise can cause interparticle strong collision, makes the hydrous oxide settled layer that just is deposited to the TiO 2 particles surface destroyed; 6, the sodium silicate solution concentration used of fine and close composite membrane is low, and water glass is counted 0.1～0.3mol/l with sodium oxide, can increase the cohesion tendency of activity and then enhanced activity silicon greater than 1mol/l.
Summary of the invention
The objective of the invention is to develop a kind of brand-new fine and close composite membrane titanium dioxide surface treatment method, it has broken through traditional fine and close composite membrane technology thinking, has innovated technology, has simplified flow process, is convenient to realize automatization control, guarantees constant product quality.
The present invention includes following concrete steps:
(1) with the rutile titanium dioxide raw material, add sodium hexametaphosphate dispersant or water glass etc., make the titania slurry of concentration 100～450g/l according to a conventional method;
(2) above-mentioned titania slurry is added surface processor, be warming up to 60～70 ℃ with steam heating, with sig water slurry pH value is adjusted to 9～11 again, keep the violent stirring state;
(3) preparation Na
2SiO
3And Al
2(SO
4)
3The concentration of solution is respectively 0.1～1.3mol/l and 0.1～0.8mol/l;
(4) design the coating quantity of silicon-dioxide and aluminium sesquioxide, two annotate and drip adds process of adopting the compound coating of sial is with Na
2SiO
3And Al
2(SO
4)
3Solution adds surface processor respectively, and the reinforced time is 2～3 hours, keeps feed rate stable, finely tunes Na simultaneously
2SiO
3Or Al
2(SO
4)
3The dosage of solution by 9～11, slowly evenly drops to 6～6.5 with slurry pH value;
(5) behind reinforced the finishing, ageing 1～3 hour is adjusted to 7～8 with alkali lye with slurry pH value again, washs then, filtration drying, comminution by gas stream and conventional subsequent handling such as organically-modified.
Wherein the described titania slurry concentration of step (1) is preferably 400～450g/l.
The described titania slurry temperature of step (2) is preferably 60～65 ℃, and described violent stirring STA representation stirring intensity is the bigger the better.
The described Na of step (3)
2SiO
3And Al
2(SO
4)
3The concentration of solution is preferably 1.0～1.3mol/l and 0.7～0.8mol/l.
The coating quantity of the described silicon-dioxide of step (4) and aluminium sesquioxide preferably accounts for 2.5～3.5% and 1.5～2.5% of titanium dioxide gross weight.
Best 2 hours of the described digestion time of step (5).
The present invention compares with existing fine and close composite membrane industrial process: the titanium dioxide pulp density is brought up to 400～450g/l by 100 traditional～300g/l, coating agent Na
2SiO
3And Al
2(SO
4)
3The concentration of solution is brought up to 1.0～1.3mol/l and 0.7～0.8mol/l, has not only broken through the prejudice on the present dense film technology understanding, and has improved production efficiency; Because composite coated do not have sulfuric acid and liquid caustic soda consumption, the coating cycle has shortened one times simultaneously, has reduced production cost; Na in addition
2SiO
3And Al
2(SO
4)
3Solution acid alkalinity is all more weak, and the control of coating process pH regulator becomes easily simple; The coating temperature is lower than about 20 ℃ of conventional dense membrane envelope temperature, meets the theory of green production, can energy efficient; The whole coating process all will keep the strong stirring intensity of titanium dioxide slip, has broken through existing theory; Coating process is simple, is convenient to realize automatization control, has guaranteed the quality continous-stable.
The rutile titanium white powder that adopts the present invention to produce, through electronic microscope photos, rete is smooth, even, continuous, fine and close, and thickness is between 5～10 nanometers; Detect through weathering resistance, reach international like product level.
Claims (6)
1. the surface treatment method of a fine and close composite membrane titanium dioxide comprises following concrete steps:
(1) with the rutile titanium dioxide raw material, add sodium hexametaphosphate dispersant or water glass, make the titania slurry of concentration 100～450g/l according to a conventional method;
(2) above-mentioned titania slurry is added surface processor, be warming up to 60～70 ℃ with steam heating, with sig water slurry pH value is adjusted to 9～11 again, keep the violent stirring state;
(3) preparation Na
2SiO
3And Al
2(SO
4)
3The concentration of solution is respectively 0.1～1.3 mol/l and 0.1～0.8 mol/l;
(4) design the coating quantity of silicon-dioxide and aluminium sesquioxide, two annotate and drip adds process of adopting the compound coating of sial is with Na
2SiO
3And Al
2(SO
4)
3Solution adds surface processor respectively, and the reinforced time is 2～3 hours, keeps feed rate stable, finely tunes Na simultaneously
2SiO
3Or Al
2(SO
4)
3The dosage of solution by 9～11, slowly evenly drops to 6～6.5 with slurry pH value;
(5) reinforced finishing, ageing was adjusted to 7～8 with alkali lye with slurry pH value after 1～3 hour again, washed then, filtration drying, comminution by gas stream and organically-modified conventional subsequent handling.
2. described method of claim 1, wherein the described titania slurry concentration of step (1) is 400～450g/l.
3. a claim 1 or 2 described methods, wherein the described titania slurry temperature of step (2) is 60～65 ℃.
4. the described method of claim 3, the wherein described Na of step (3)
2SiO
3And Al
2(SO
4)
3The concentration of solution is 1.0～1.3 mol/l and 0.7～0.8 mol/l.
5. described method of claim 4, wherein the coating quantity of the described silicon-dioxide of step (4) and aluminium sesquioxide accounts for 2.5～3.5% and 1.5～2.5% of titanium dioxide gross weight.
6. described method of claim 5, wherein the described digestion time of step (5) is 2 hours.
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| CN 201010120761 CN102190910B (en) | 2010-03-05 | 2010-03-05 | Surface treatment method for titanium white powder with dense composite film |
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| CN 201010120761 CN102190910B (en) | 2010-03-05 | 2010-03-05 | Surface treatment method for titanium white powder with dense composite film |
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| CN102190910B true CN102190910B (en) | 2013-09-04 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102993784A (en) * | 2012-11-08 | 2013-03-27 | 安徽安纳达钛业股份有限公司 | Improved titanium dioxide powder surface treatment method |
| CN103913431B (en) * | 2014-04-21 | 2016-10-26 | 济南裕兴化工有限责任公司 | The assay method of titanium dioxide acid solubility |
| CN104568941A (en) * | 2015-02-12 | 2015-04-29 | 攀钢集团钛业有限责任公司 | Method for quickly determining weather resistance of SiO2-coated titanium white |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1775869A (en) * | 2005-12-05 | 2006-05-24 | 无锡豪普钛业有限公司 | Titanium dioxide pigment and its preparing method |
| CN1844263A (en) * | 2006-04-21 | 2006-10-11 | 江苏镇钛化工有限公司 | Process for preparing titanium dioxide with dispersion sensitive property and high weatherability |
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2010
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1775869A (en) * | 2005-12-05 | 2006-05-24 | 无锡豪普钛业有限公司 | Titanium dioxide pigment and its preparing method |
| CN1844263A (en) * | 2006-04-21 | 2006-10-11 | 江苏镇钛化工有限公司 | Process for preparing titanium dioxide with dispersion sensitive property and high weatherability |
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