CN103819943A - Producing method of yellowing-resistant general anatase titanium dioxide - Google Patents
Producing method of yellowing-resistant general anatase titanium dioxide Download PDFInfo
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Abstract
The invention discloses a producing method of yellowing-resistant general anatase titanium dioxide. The method comprises the following steps: A, beating calcined anatase titanium dioxide with desalted water to prepare slurry, adding wetting agent sodium silicate, and then adjusting the slurry pH to 9-11; B, sanding to obtain anatase titanium dioxide initial product slurry with 325 mesh residues on a sieve being less than 0.01%; C, diluting with the desalted water to a concentration of 280-340g / L by TiO2, adjusting the pH to 9-11; D, heating up to 40-90 DEG C, then adding silicon salt within 10-60min, curing for 60-120min; adding aluminium salt, curing for 15-60min; adding the aluminum salt again, curing for 60-120min; and E, filtering, washing, drying, adding an organic surface treatment agent for gas pulverization to obtain the general titanium dioxide. The general titanium dioxide produced by the method has the characteristics of good lattice stability, strong water dispersion stability and the like, and especially has the characteristics of heat-resisting and yellowing yellowing-resistant characteristics.
Description
Technical field
The invention belongs to titanium white production field, be specifically related to a kind of method that height is weather-proof, particularly have the general anatase thpe white powder of better yellowing resistance of producing.
Background technology
Titanium dioxide is take crystalline titania as main component, there is the characteristic far above other inorganics specific refractory poweres, this makes titanium dioxide have the strongest opacifying power and becomes the white pigment of current the best, and is widely used in the numerous areas such as coating, plastics, papermaking, ink and pottery as a kind of important industrial chemicals.Advantage as the up-and-coming youngster-titanium white of white pigment is very obvious, has been substituted traditional white pigment, becomes the leading product in pigment market.The pigment performance that it is good, has allowed titanium white become the white pigment kind of the numerous areas first-selections such as industry, civilian, building.
At present in anatase thpe white powder except catalysis titanium white and the special titanium white of chemical fibre, also do not find universal sharp titanium titanium dioxide to carry out the processing of organic and inorganic coating to improve the technology of titanium white quality, the anatase thpe white powder using on the market is now mostly common universal titanium dioxide, has the series of problems such as universal anatase thpe white powder product dispersiveness is unstable, poor heat resistance, easily flavescence, easy efflorescence.Even if some all do not show good yellowing resistance in disclosed Rutile type Titanium Dioxide patent.As:
The Chinese invention patent that is 200610043664.1 in the patent No. discloses " complete processing of white titanium pigment with high application performance ", and the product that this invention discloses is also universal product, has embodied dispersiveness, does not relate to yet this technology of yellowing resistance; Application number is that 200610020847.1 Chinese invention patent discloses " production method of high weathering resistance titanium dioxide pigment ", and the method has disclosed a kind of mode of production of high-weatherability product, and product does not relate to the yellowing resistance that improves product yet.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of method of producing the high weather-proof general titanium dioxide of anatase titanium dioxide, and the method is produced the general titanium dioxide obtaining, and to have lattice stability good, and dispersion stability is strong, particularly has the feature of heat-resisting yellowing resistance.
The technical solution adopted for the present invention to solve the technical problems is: produce the method for the general titanium dioxide of anti-yellowing property anatase titanium dioxide, comprise the steps:
A, the anatase thpe white powder after calcining is made to slurry with de-salted water making beating, add wetting agent water glass, the add-on of water glass is: quality=0.15～0.35% of titanium dioxide in the Zhi Liang ︰ slurry of silicon-dioxide in water glass; Then regulate pH value to 9～11 of slip with sodium hydroxide solution;
B, the slip that step a is obtained are delivered to sand mill sand milling, and sand milling obtains the sharp titanium first product slurry that 325 screen residues are less than 0.01%;
C, the sharp titanium first product slurry de-salted water that step b is obtained are diluted to concentration and count 280～340g/L with titanium dioxide, then regulate pH to 9～11;
D, the slip that step c is obtained are warming up to 40～90 ℃, then in 10～60min, add silicon salt, and the add-on of silicon salt is: quality=0.6～1.0% of titanium dioxide in the Zhi Liang ︰ slurry of silicon-dioxide in silicon salt; Add silicon salt post curing 60～120min;
Add after the slaking of silicon salt and add aluminium salt in 30～60min, the add-on of aluminium salt is: quality=0.55～1.2% of titanium dioxide in the Zhi Liang ︰ slurry of aluminium sesquioxide in aluminium salt; Add aluminium salt post curing 15～60min;
Upper step adds after the slaking of aluminium salt and adds aluminium salt in 35～75min again, and the add-on of aluminium salt is: quality=0.65～1.35% of titanium dioxide in the Zhi Liang ︰ slurry of aluminium sesquioxide in aluminium salt; Then regulate pH to 7～9, slaking 60～120min;
E, by slurry filtration after treatment steps d, then wash, dry, add the laggard promoting the circulation of qi powder of organic surface treatment agent, obtain the general titanium dioxide of anti-yellowing property anatase titanium dioxide; The add-on of organic surface treatment agent is: quality=0.1～0.4% of the Zhi Liang ︰ titanium dioxide of carbon in organic surface treatment agent.
Wherein, the organic surface treatment agent described in aforesaid method is silane coupling agent.Described gas powder is comminution by gas stream post, is to adopt superheated vapour to carry out comminution by gas stream grinding to titanium dioxide, and carries out the measure of organic coated processing simultaneously.
Wherein, in aforesaid method step a, making beating finish mix slurry concentration is counted 700～1000g/L with titanium dioxide.
Wherein, in aforesaid method step c, what adjusting pH adopted is sodium hydroxide and/or sodium carbonate.
Wherein, in aforesaid method steps d, described silicon salt is water glass.
Wherein, in aforesaid method steps d, described aluminium salt is Tai-Ace S 150 or sodium metaaluminate.Preferred, the aluminium salt first adding is Tai-Ace S 150, after the aluminium salt that adds be sodium metaaluminate.
Wherein, in aforesaid method steps d, what adjusting pH adopted is at least one in sulfuric acid, hydrochloric acid, sodium hydroxide or sodium carbonate, or Tai-Ace S 150 or sodium metaaluminate.
Wherein, in aforesaid method step a, wetting agent replaces with Sodium hexametaphosphate 99, and the add-on of Sodium hexametaphosphate 99 is: quality=0.15～0.35% of titanium dioxide in the Zhi Liang ︰ slurry of Vanadium Pentoxide in FLAKES in Sodium hexametaphosphate 99.
Wherein, in aforesaid method step a, wetting agent replaces with α-amino isopropyl alcohol, and the add-on of α-amino isopropyl alcohol is: quality=0.15～0.35% of titanium dioxide in the Zhi Liang ︰ slurry of α-amino isopropyl alcohol.
Wherein, in aforesaid method step a, wetting agent replaces with trisodium phosphate, and the add-on of trisodium phosphate is: quality=0.15～0.35% of titanium dioxide in the Zhi Liang ︰ slurry of Vanadium Pentoxide in FLAKES in trisodium phosphate.
Wherein, in aforesaid method step a, wetting agent replaces with monoethanolamine, and the add-on of monoethanolamine is: quality=0.15～0.35% of titanium dioxide in the Zhi Liang ︰ slurry of monoethanolamine.
The invention has the beneficial effects as follows: the present invention by making beating, add wetting agent, regulate pH, grinding, dilution and adjust again pH(step a to c) measure make crude product pigment particles there is better dispersion stabilization, for follow-up inorganic coating process provides best condition, realize coated uniformly; The present invention is the (measures such as temperature, each operation steps time, add-on of d) strictly controlling of step in inorganic coating process, guarantee dispersiveness, weathering resistance, whiteness and the glossiness of product, and then carry out that organic coated (step e) further improves dispersiveness and the weathering resistance of product; Above-mentioned aggregate measures can make the present invention produce the titanium dioxide obtaining to have the features such as lattice stability is good, dispersion stability is strong, particularly have the feature of heat-resisting yellowing resistance.The production of the general titanium dioxide of anatase titanium dioxide that the present invention is high-weatherability, particularly heat-resisting yellowing resistance provides a kind of rigorous new method.
Embodiment
The present invention produces the method for the general titanium dioxide of anti-yellowing property anatase titanium dioxide, comprises the steps:
A, the anatase thpe white powder after calcining is made to slurry with de-salted water making beating, add wetting agent water glass, the add-on of water glass is: quality=0.15～0.35% of titanium dioxide in the Zhi Liang ︰ slurry of silicon-dioxide in water glass; Then regulate pH value to 9～11 of slip with sodium hydroxide solution;
B, the slip that step a is obtained are delivered to sand mill sand milling, and sand milling obtains the sharp titanium first product slurry that 325 screen residues are less than 0.01%;
C, the sharp titanium first product slurry de-salted water that step b is obtained are diluted to concentration and count 280～340g/L with titanium dioxide, then regulate pH to 9～11;
D, the slip that step c is obtained are warming up to 40～90 ℃, then in 10～60min, add silicon salt, and the add-on of silicon salt is: quality=0.6～1.0% of titanium dioxide in the Zhi Liang ︰ slurry of silicon-dioxide in silicon salt; Add silicon salt post curing 60～120min;
Add after the slaking of silicon salt and add aluminium salt in 30～60min, the add-on of aluminium salt is: quality=0.55～1.2% of titanium dioxide in the Zhi Liang ︰ slurry of aluminium sesquioxide in aluminium salt; Add aluminium salt post curing 15～60min;
Upper step adds after the slaking of aluminium salt and adds aluminium salt in 35～75min again, and the add-on of aluminium salt is: quality=0.65～1.35% of titanium dioxide in the Zhi Liang ︰ slurry of aluminium sesquioxide in aluminium salt; Then regulate pH to 7～9, slaking 60～120min;
E, by slurry filtration after treatment steps d, then wash, dry, add the laggard promoting the circulation of qi powder of organic surface treatment agent, obtain the general titanium dioxide of anti-yellowing property anatase titanium dioxide; The add-on of organic surface treatment agent is: quality=0.1～0.4% of the Zhi Liang ︰ titanium dioxide of carbon in organic surface treatment agent.
Technique scheme of the present invention is an overall measure, and in order fully to realize effect of the present invention, particularly for yellowing resistance, suggestion should operate in strict accordance with aforesaid method, and arbitrarily change parameter, such as pH value etc.
Preferably, the organic surface treatment agent described in aforesaid method is silane coupling agent.Described gas powder is comminution by gas stream post, is to adopt superheated vapour to carry out comminution by gas stream grinding to titanium dioxide, and carries out the measure of organic coated processing simultaneously.
Preferably, in order to be more conducive to follow-up making beating grinding operation, in aforesaid method step a, making beating finish mix slurry concentration is counted 700～1000g/L with titanium dioxide.
Preferably, in aforesaid method step c, what adjusting pH adopted is sodium hydroxide and/or sodium carbonate.
Preferably, in aforesaid method steps d, described silicon salt is water glass.
Preferably, in aforesaid method steps d, described aluminium salt is Tai-Ace S 150 or sodium metaaluminate.Preferred, the aluminium salt first adding is Tai-Ace S 150, after the aluminium salt that adds be sodium metaaluminate.
Preferably, in aforesaid method steps d, what adjusting pH adopted is at least one in sulfuric acid, hydrochloric acid, sodium hydroxide or sodium carbonate, or Tai-Ace S 150 or sodium metaaluminate.
Wherein, in aforesaid method step a, wetting agent can replace with Sodium hexametaphosphate 99, and the add-on of Sodium hexametaphosphate 99 is: quality=0.15～0.35% of titanium dioxide in the Zhi Liang ︰ slurry of Vanadium Pentoxide in FLAKES in Sodium hexametaphosphate 99.
Wherein, in aforesaid method step a, wetting agent can replace with α-amino isopropyl alcohol, and the add-on of α-amino isopropyl alcohol is: quality=0.15～0.35% of titanium dioxide in the Zhi Liang ︰ slurry of α-amino isopropyl alcohol.
Wherein, in aforesaid method step a, wetting agent can replace with trisodium phosphate, and the add-on of trisodium phosphate is: quality=0.15～0.35% of titanium dioxide in the Zhi Liang ︰ slurry of Vanadium Pentoxide in FLAKES in trisodium phosphate.
Wherein, in aforesaid method step a, wetting agent can replace with monoethanolamine, and the add-on of monoethanolamine is: quality=0.15～0.35% of titanium dioxide in the Zhi Liang ︰ slurry of monoethanolamine.
Below by embodiment, the present invention is described further, but therefore protection scope of the present invention is not limited among embodiment.
Embodiment mono-adopts the inventive method preparation
Rotary kiln gained first product is made to the slurry of 850g/l with de-salted water, using water glass as wetting agent, water glass add-on is counted titanium dioxide quality 0.2% in titania slurry with SiO2, with the NaOH adjust pH of 200g/l be 10.00, disperse, sand milling (325 mesh sieve screeningss are less than 0.01%); It is 310g/l that gained titania slurry after sand milling is diluted to concentration, with the NaOH adjust pH of 200g/l be 10.00, be warming up to 60 ℃, in the time of 10min, add the sodium silicate solution of titanium dioxide quality 0.6% (with SiO
2meter), finish post curing 60min; In the time of 30min, add Tai-Ace S 150 0.7%(with Al
2o
3meter), finish post curing 25min; In the time of 50min, add sodium metaaluminate 0.85%(Al
20
3meter), finish post curing 45min, after finishing, slaking add Tai-Ace S 150 that slurry pH is adjusted to 8.0, slaking 1h.
Gained titania slurry is filtered, and washing 2h, makes titanium dioxide moisture be less than 0.1% through expansion drying, adds silane coupling agent at gas powder machine inlet capable, and add-on counts 0.3% with C content, obtains product after gas powder.
Table 1 embodiment mono-product and PTA-120 performance comparison table
Note: 1, with PTA-120 standard specimen as a comparison.PTA-120 titanium dioxide is to climb the tailored version expensive goods that steel Group Titanium industry company produces, and has that whiteness is good, reducing power is high, water regain is low, a feature such as even particle size distribution, water-dispersion are good; Being mainly used in the industries such as water-borne coatings, papermaking, emulsion paint, is the high-end product representative of domestic anatase thpe white powder product.
2, before treatment fall kiln product do not do corresponding follow-up index evaluation.
Correlation detection situation explanation (other embodiment are identical):
1, the detection method of color and reducing power is carried out according to GB GB/T1706-2006.
2, the detection of particle diameter is with the Ma Erwen laser particle analyzer MS-2000 of company.
3, opacifying power is to be dispersed in 4g standard white slurry with 0.2g titanium dioxide; After disperseing with standard specimen similarity condition, the visual opacifying power situation of scraper plate.
4, anti-yellowing property detects and is: get the appropriate treated titanium dioxide sample completing on watch-glass, put into 250 ℃ of baking ovens and toast 1h, observe its appearance color changing conditions.
5, in water, suspension stability mixes rear standing 5h according to 5% titanium dioxide concentration, and visual method is observed the layering situation of slurry.The mensuration of water dispersible:
1. weigh:
Take titanium dioxide 15g, put into the 500ml beaker that 285ml deionized water is housed in advance.
2. disperse:
Beaker is placed on and on magnetic stirring apparatus, stirs 30min.
3. centrotheca is measured:
4. get vibration slurry 10ml and put into the weighing bottle of constant weight, take slurry weight W1, then dry more than 4 hours to constant weight, after cooling and take lingering section weighing scale W2 in 140 ℃.
5. quiescent settling:
Residue dispersed paste is packed in 250ml graduated cylinder, makes liquid level keep 200ml, be placed on smooth service platform quiescent settling 5 hours.
6. dispersion liquid sampling:
With suction pipe draw dispersion liquid to 250ml beaker, imbibition starts to 30ml part at the bottom of liquid from liquid level.
7. dispersion liquid is dried and is weighed:
With pipette, extract 10ml put into constant weight weighing bottle, claim that its weight is W3, dispersion liquid is dried more than 4 hours to constant weight, the residual part of cooling rear weighing weighing scale W in 140 ℃
4.
8. calculate:
Water dispersible
in formula: W
1-sample slip the weight (g) that takes; W
3-dispersion liquid sample weight (g);
W
2the solid formation weight (g) of-sample slip; W
4the solid formation weight (g) of-dispersion liquid sample.
Embodiment bis-adopts the inventive method preparation
Rotary kiln gained first product is made to the slurry of 850g/l with de-salted water, using α-amino isopropyl alcohol as wetting agent, with the NaOH adjust pH of 200g/l be 10.00, disperse, sand milling (325 mesh sieve screeningss are less than 0.01%); It is 310g/l that gained titania slurry after sand milling is diluted to concentration, with the NaOH adjust pH of 200g/l be 10.00, be warming up to 60 ℃, in the time of 10min, add the sodium silicate solution of titanium dioxide quality 0.8% (with SiO
2meter), finish post curing 60min; In the time of 30min, add Tai-Ace S 150 0.7%(with Al
2o
3meter), finish post curing 25min; In the time of 50min, add sodium metaaluminate 0.85%(Al
20
3meter), finish post curing 45min, after finishing, slaking add Tai-Ace S 150 that slurry pH is adjusted to 8.0, slaking 1h.
Gained titania slurry is filtered, and washing 2h, makes titanium dioxide moisture be less than 0.1% through expansion drying, adds silane coupling agent at gas powder machine inlet capable, and add-on counts 0.3% with C content, obtains product after gas powder.
Table 2 embodiment bis-products and PTA-120 performance comparison table
Note: 1, with PTA-120 standard specimen as a comparison.
2, before treatment fall kiln product do not do corresponding follow-up index evaluation.
Embodiment tri-adopts the inventive method preparation
Rotary kiln gained first product is made to the slurry of 850g/l with de-salted water, using Sodium hexametaphosphate 99 as wetting agent, Sodium hexametaphosphate 99 add-on is with P
2o
5count titanium dioxide quality 0.2% in titania slurry, with the NaOH adjust pH of 200g/l be 10.00, disperse, sand milling (325 mesh sieve screeningss are less than 0.01%); It is 310g/l that gained titania slurry after sand milling is diluted to concentration, with the NaOH adjust pH of 200g/l be 10.00, be warming up to 60 ℃, in 10min, add the sodium silicate solution of titanium dioxide quality 0.8% (with SiO
2meter), finish post curing 60min; In 30min, add Tai-Ace S 150 0.85%(with Al
2o
3meter), finish post curing 25min; In 50min, add sodium metaaluminate 1.15%(Al203 meter), finish post curing 45min, after finishing, slaking add dilute sulphuric acid that slurry pH is adjusted to 8.0, slaking 1h.
Gained titania slurry is filtered, and washing 2h, makes titanium dioxide moisture be less than 0.1% through expansion drying, adds silane coupling agent at gas powder machine inlet capable, and add-on counts 0.3% with C content, obtains product after gas powder.
Table 3 embodiment three products and PTA-120 performance comparison table
Note: 1, with PTA-120 standard specimen as a comparison.
2, before treatment fall kiln product do not do corresponding follow-up index evaluation.
Embodiment tetra-adopts the inventive method preparation
Rotary kiln gained first product is made to the slurry of 850g/l with de-salted water, using water glass as wetting agent, water glass add-on is with SiO
2count titanium dioxide quality 0.2% in titania slurry, with the NaOH adjust pH of 200g/l be 10.00, disperse, sand milling (325 mesh sieve screeningss are less than 0.01%); It is 310g/l that gained titania slurry after sand milling is diluted to concentration, with the NaOH adjust pH of 200g/l be 10.00, be warming up to 60 ℃, in 10min, add 0.6% sodium silicate solution (with SiO
2meter), finish post curing 60min; In 30min, add Tai-Ace S 150 0.85%(with Al
2o
3meter), finish post curing 25min; In 50min, add sodium metaaluminate 1.15%(Al
20
3meter), finish post curing 45min, after finishing, slaking add Tai-Ace S 150 that slurry pH is adjusted to 8.0, slaking 80min.
Gained titania slurry is filtered, and washing 2h, makes titanium dioxide moisture be less than 0.1% through expansion drying, adds silane coupling agent at gas powder machine discharge port, and add-on counts 0.3% with C content, obtains product after gas powder.
Table 4 embodiment four-product and PTA-120 performance comparison table
Note: 1, with PTA-120 standard specimen as a comparison.
2, before treatment fall kiln product do not do corresponding follow-up index evaluation.
Comparative example one (adopting the disclosed method of patent that the patent No. is 200610043664.1)
Choose the patent No.: 200610043664.1 disclosed methods, contrast the performance situation of implementing checking product of the present invention.This patent is Rutile type Titanium Dioxide coated product technology, and present techniques is anatase titanium dioxide coated product, because rutile-type and anatase thpe white powder also there are differences because crystalline structure difference causes pigment performance; So contrast proof test is considered with this report patent film-coating technique, and anatase thpe white powder is carried out to coating processing; Make equally anatase titanium dioxide coated product reference product performance again.
Specific implementation process:
1, experiment is implemented
Anatase titanium dioxide first product 500g is mixed with to slurry with deionized water, and adding sodium hydroxide solution to make slurry pH value is 10.05, adds sodium hexametaphosphate solution, by slurry sand milling in sand mill, considers and sand grains and coarse particles with sieve.Slurry is joined in coating tank, be warming up to 76 ℃, start to wrap fine and close silicon.First add 0.5% sodium silicate solution of titanium dioxide first product add-on (with SiO
2meter), then and stream add 0.5% sodium silicate solution of titanium dioxide first product add-on (with SiO
2meter) and the weight percent concentration sulphuric acid soln that is 20%, the speed adding maintains between 10.0～11.0 with maintenance slurry pH value.After reinforced end, being at the uniform velocity acidified to slurry pH value with sulphuric acid soln is 7.5, then stirs slaking, and temperature is down to 70 ℃ by 76 ℃, and stream adds 0.5% sodium aluminate solution of titanium dioxide first product add-on (with Al
2o
3meter) and the weight percent concentration sulphuric acid soln that is 30%, add speed to maintain slurry pH value as 8.3 ± 0.2, stir again slaking, adjusting slurry pH value with sulfuric acid is 7.5, stirs slaking, filters, washing, dry, then comminution by gas stream adds TriMethylolPropane(TMP) (TMP) to carry out organic process in the time of comminution by gas stream.
2, sample contrast
From the anatase titanium dioxide coating sample making according to this report patented technology, sample difference prepared by outward appearance whiteness and color and present techniques is little, significant difference is: the sample that 1, prepared by document patented method, the suspension stability under water-based system 5% concentration does not have the sample dispersion of this technology good.2, the sample appearance color from high bake, the sample variation that the look change situation of sample prepared by document patented method is also prepared than this technology is much obvious.General quality contrast situation is as shown in table 5 below:
This technical products of table 5 and document patent working sample contrast table
Note: the sample making using document patented method is as standard specimen.
Comparative example two (adopting the disclosed method of patent that the patent No. is 200610020847.1)
Choose the patent No.: 200610020847.1 disclosed methods, contrast the performance situation of implementing checking product of the present invention.This patent is Rutile type Titanium Dioxide coated product technology, and present techniques is anatase titanium dioxide coated product, because rutile-type and anatase thpe white powder also there are differences because crystalline structure difference causes pigment performance; So contrast proof test is considered with this report patent film-coating technique, and anatase thpe white powder is carried out to coating processing; Make equally anatase titanium dioxide coated product reference product performance again
Specific implementation process:
1, experiment is implemented
Get anatase titanium dioxide powder, under whipped state, add wherein the deionized water that has been warmed up to 80-100 ℃, be mixed with the slurry of 400g/l.Make the pH value of slurry remain on 10, regulate PH with dilute sulphuric acid.Add silicon-dioxide 2%(earth silicon/titanic oxide), need to slowly add, whole process completes at 30-60min, and then then slaking 30-50min regulates pH 6.5, add aluminum oxide 2%(aluminum oxide/titanium dioxide), need to slowly add, whole process completes at 30-60min, then slaking 30-50min, regulate pH 5, slaking 60-80min.Slurry is poured in Büchner funnel, by temperature till the deionized water of 60-80 ℃ is washed till sulfate radical-free.Then material is prevented from drying in baking oven, material drying is pulverized at small-sized crusher, obtain diameter of particle at 5-20 μ m.
2, sample contrast
From the anatase titanium dioxide coating sample making according to this report patented technology, sample difference prepared by outward appearance whiteness and color and present techniques is little, significant difference is: the sample that 1, prepared by document patented method, the suspension stability under water-based system 5% concentration does not have the sample dispersion of this technology good.2, the sample appearance color from high bake, the sample variation that the look change situation of sample prepared by document patented method is also prepared than this technology is much obvious.General quality contrast situation is as shown in table 6 below:
This technical products of table 6 and document patent working sample contrast table
Note: the sample 1, making using document patented method is as standard specimen.
Claims (10)
1. the method for producing the general titanium dioxide of anti-yellowing property anatase titanium dioxide, is characterized in that comprising the steps:
A, the anatase thpe white powder after calcining is made to slurry with de-salted water making beating, add wetting agent water glass, the add-on of water glass is: quality=0.15～0.35% of titanium dioxide in the Zhi Liang ︰ slurry of silicon-dioxide in water glass; Then regulate pH value to 9～11 of slip with sodium hydroxide solution;
B, the slip that step a is obtained are delivered to sand mill sand milling, and sand milling obtains the sharp titanium first product slurry that 325 screen residues are less than 0.01%;
C, the sharp titanium first product slurry de-salted water that step b is obtained are diluted to concentration and count 280～340g/L with titanium dioxide, then regulate pH to 9～11;
D, the slip that step c is obtained are warming up to 40～90 ℃, then in 10～60min, add silicon salt, and the add-on of silicon salt is: quality=0.6～1.0% of titanium dioxide in the Zhi Liang ︰ slurry of silicon-dioxide in silicon salt; Add silicon salt post curing 60～120min;
Add after the slaking of silicon salt and add aluminium salt in 30～60min, the add-on of aluminium salt is: quality=0.55～1.2% of titanium dioxide in the Zhi Liang ︰ slurry of aluminium sesquioxide in aluminium salt; Add aluminium salt post curing 15～60min;
Upper step adds after the slaking of aluminium salt and adds aluminium salt in 35～75min again, and the add-on of aluminium salt is: quality=0.65～1.35% of titanium dioxide in the Zhi Liang ︰ slurry of aluminium sesquioxide in aluminium salt; Then regulate pH to 7～9, slaking 60～120min;
E, by slurry filtration after treatment steps d, then wash, dry, add the laggard promoting the circulation of qi powder of organic surface treatment agent, obtain the general titanium dioxide of anti-yellowing property anatase titanium dioxide; The add-on of organic surface treatment agent is: quality=0.1～0.4% of the Zhi Liang ︰ titanium dioxide of carbon in organic surface treatment agent.
2. the method for the general titanium dioxide of production according to claim 1 anti-yellowing property anatase titanium dioxide, is characterized in that: in step a, making beating finish mix slurry concentration is counted 700～1000g/L with titanium dioxide.
3. the method for the general titanium dioxide of production according to claim 1 anti-yellowing property anatase titanium dioxide, is characterized in that: in step c, what adjusting pH adopted is sodium hydroxide and/or sodium carbonate.
4. the method for the general titanium dioxide of production according to claim 1 anti-yellowing property anatase titanium dioxide, is characterized in that: in steps d, described silicon salt is water glass.
5. the method for the general titanium dioxide of production according to claim 1 anti-yellowing property anatase titanium dioxide, is characterized in that: in steps d, described aluminium salt is Tai-Ace S 150 or sodium metaaluminate.
6. the method for the general titanium dioxide of production according to claim 1 anti-yellowing property anatase titanium dioxide, is characterized in that: in steps d, what adjusting pH adopted is at least one in sulfuric acid, hydrochloric acid, sodium hydroxide or sodium carbonate, or Tai-Ace S 150 or sodium metaaluminate.
7. according to the method for the general titanium dioxide of the anti-yellowing property anatase titanium dioxide of the production described in any one in claim 1 to 6, it is characterized in that: in step a, wetting agent replaces with Sodium hexametaphosphate 99, the add-on of Sodium hexametaphosphate 99 is: quality=0.15～0.35% of titanium dioxide in the Zhi Liang ︰ slurry of Vanadium Pentoxide in FLAKES in Sodium hexametaphosphate 99.
8. according to the method for the general titanium dioxide of the anti-yellowing property anatase titanium dioxide of the production described in any one in claim 1 to 6, it is characterized in that: in step a, wetting agent replaces with α-amino isopropyl alcohol, the add-on of α-amino isopropyl alcohol is: quality=0.15～0.35% of titanium dioxide in the Zhi Liang ︰ slurry of α-amino isopropyl alcohol.
9. according to the method for the general titanium dioxide of the anti-yellowing property anatase titanium dioxide of the production described in any one in claim 1 to 6, it is characterized in that: in step a, wetting agent replaces with trisodium phosphate, the add-on of trisodium phosphate is: quality=0.15～0.35% of titanium dioxide in the Zhi Liang ︰ slurry of Vanadium Pentoxide in FLAKES in trisodium phosphate.
10. according to the method for the general titanium dioxide of the anti-yellowing property anatase titanium dioxide of the production described in any one in claim 1 to 6, it is characterized in that: in step a, wetting agent replaces with monoethanolamine, the add-on of monoethanolamine is: quality=0.15～0.35% of titanium dioxide in the Zhi Liang ︰ slurry of monoethanolamine.
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