CN106497147B - A kind of preparation method with high covering power, high-weatherability and high whiteness titanium dioxide pigment - Google Patents
A kind of preparation method with high covering power, high-weatherability and high whiteness titanium dioxide pigment Download PDFInfo
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- C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
- C09C1/36—Compounds of titanium
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- C09C3/00—Treatment in general of inorganic materials, other than fibrous fillers, to enhance their pigmenting or filling properties
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- C09C3/00—Treatment in general of inorganic materials, other than fibrous fillers, to enhance their pigmenting or filling properties
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- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
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Abstract
A kind of preparation method with high covering power, high-weatherability and high whiteness titanium dioxide pigment, using titanium dioxide first product, is beaten in water, is configured to slurry, adds in water-soluble silicate solution as dispersant, milled processed is carried out after curing；It heats up to slurry, adds in water-soluble silicate solution, using inorganic acid tune pH value, the fine and close unformed silicon oxide film of hydration is formed after curing；Water-soluble silicate solution is added in again, and slurry pH value is maintained using acid aluminum contained compound, the loose porous film layer based on aluminium hydrosilicate is formed after curing, ensures high covering power and whiteness performance；Loose aqua oxidation aluminium film is finally coated, ensures product excellent dispersion performance；Filtration washing, drying, gas powder, bag hose recycle to obtain finished product.Advantage is：Titanium dioxide pigment prepared by this method is in addition to covering power is excellent, and good with high durable, whiteness, production cost is low, and can be widely applied to zero diopter, the building coating of matt and ink etc. has the field of high dry hiding power requirement.
Description
Technical field
There is high covering power, high-weatherability, high whiteness titanium dioxide pigment the present invention relates to a kind of in chemical field
Preparation method.
Background technology
Titanium dioxide is one of most important fine chemical material, becomes purposes due to high refractive index, reducing power and covering power are high
Most wide white pigment is referred to as " king of white pigment ".By extensively should be due to coating, plastics, papermaking, rubber, chemical fibre
Etc. in industrial productions.Wherein coating industry is maximum using titanium dioxide amount, accounts for about more than the 60% of total amount, titanium white powder pigment is coating
Important component, the purpose is to play a part of cover and be assigned to coating color and durability, the quality of coating is in very great Cheng
The quality of pigment is depended on degree.Architectural latex coating has the characteristics that green, environmental protection, in recent years as one kind in water paint
More to be favored by client.With the increase of building coating usage amount, top-grade building coating is to the covering power of pigment, weather-proof
The indexs such as property, whiteness propose increasingly higher demands.Architectural latex coating coating has high pigment volume concentration (PVC), and covering power is
By the specific refractivity and titanium dioxide pigment and emulsion resin and titanium dioxide face of air in titanium dioxide pigment and hole
The specific refractivity of material and water codetermines, therefore carries out severe coating processing to titanium dioxide pigment, increases titanium dioxide face
The surface porosity factor of material has become one widely to improve covering power performance of the titanium dioxide pigment in emulsion paint coating
Technology.
US 3510335 discloses a kind of in the loose porous silicon dioxide film of titania-alumina oxide surface cladding
Layer, after 300 DEG C of -1000 DEG C of calcine technologies, a kind of fastness of preparation and the method for high covering power titanium dioxide.US 3437502
Disclose a kind of production method of titanium dioxide pigment, by TiO 2 particles surface coat one layer of dense oxide silicon fiml,
Pellumina, so as to obtain it is a kind of with high covering power and in aqueous coating formulation good dispersion titanium dioxide pigment.
Chinese patent CN101885926 discloses a kind of production method of rutile type titanium white powder with high hiding power, passes through acid
Property cladding fine and close aqua oxidation silicon fiml, loose aqua oxidation silicon fiml and pellumina, improve the covering power of product, and keep its height
The method of whiteness and basic weather resistance.
At present, domestic and international titanium dioxide performance（Such as covering power, weatherability, whiteness）Raising generally using cladding by the way of reality
It is existing.Experimental studies have found that, titanium dioxide is through hydrated silica, oxidation aluminium surface cladding, really to the screening of product by a large amount of
Lid power performance is improved effect, but can bring adverse effect to product whiteness performance, and silicon oxide coated product is hydrated using acidity
Though whiteness index make moderate progress, sacrifice the weather resistance of product.Therefore, one kind can on the basis of product covering power is improved
It is urgently developed with the method for coating of weatherability and whiteness for improving product simultaneously.
Invention content
The technical problem to be solved in the present invention is to provide a kind of preparation method of titanium dioxide pigment, two made from this method
Titanium oxide pigments are applied in building coating, not only with high covering power, while have that weatherability is high, whiteness is good and tinting strength, tinting power
The characteristics of high, the titanium dioxide pigment of preparation have middle color bottom phase, have the advantages that be easy to color matching.
A kind of preparation method of high covering power titanium dioxide pigment, is as follows：
（1）The rutile titanium dioxide first product prepared using chloridising, is beaten to obtain mass concentration using deionized water
For the titania slurry of 20%-30%, slurry pH value is adjusted to 8.5~10.5 with inorganic lye；It is molten to add in water-soluble silicate
Liquid is as dispersant, and the addition of water-soluble silicate solution is with SiO2Account for TiO2Weight is calculated as 0.2%~0.5%, disperses 20min
~40min, and carry out milled processed；
（2）Slurry after grinding is warming up to 50 DEG C~70 DEG C, and maintain this temperature in entire coating process；
（3）Disposable to add in water-soluble silicate solution, the addition of water-soluble silicate solution is with SiO2Account for TiO2Weight
2.0%~4.0% is calculated as, with the inorganic acid solution that mass concentration is 5%~15% by slurry pH value to 6.0 in 60min~90min
~7.0,30~60min is cured, forms the fine and close unformed silicon oxide film of hydration；
（4）In 30min~60min, add in water-soluble silicate solution, the addition of water-soluble silicate solution with
SiO2Account for TiO2Weight is calculated as 5.0%~10.0%, while maintains slurry pH value 7.0 with bialuminate solution, and curing 30min~
60min forms loose porous silicic acid hydrate aluminium film；
（5）In 30min~60min, addition water-soluble alkaline aluminum salt solution, wherein water-soluble alkaline aluminum salt solution add
Enter amount with Al2O3Account for TiO2Weight is calculated as 3.0%~8.0%, adds in inorganic acid solution or acid aluminium salt solution maintains slurry pH value
7.0~8.0,60min~120min is cured, forms loose aqua oxidation aluminium film；
（6）By step（5）The slurry of middle curing is washed till filter cake conductivity more than 15000 with 50 DEG C~80 DEG C deionized waters
Ω cm, then be dried, the processing of vapour powder, high covering power titanium dioxide pigment is made.
Further, step（1）、（3）With（4）Described in water-soluble silicate solution for sodium silicate solution or potassium silicate it is molten
Liquid, water-soluble silicate solution concentration is with SiO2It is calculated as 100 g/L~200g/L.
Further, step（1）Described in inorganic alkali solution for sodium hydroxide solution, solution at least one in potassium hydroxide
Kind.
Further, step（4）With（5）Described in acid aluminium salt solution for aluminum trichloride solution, aluminum nitrate solution, sulfuric acid
At least one of aluminum solutions, acid aluminium salt solution concentration is with Al2O3It is calculated as 80 g/L~100g/L.
Further, step（5）The water-soluble alkaline aluminum salt solution is water-soluble aluminum acid sodium solution or water-soluble aluminic acid
Potassium solution, water-soluble aluminate solution concentration is with Al2O3It is calculated as 100 g/L~200g/L.
Further, step（3）With（5）The inorganic acid solution is hydrochloric acid solution, sulfuric acid solution, salpeter solution, phosphoric acid
At least one of solution.
Further, milled processed, making titania slurry average grain diameter, size distribution is with number for 250nm~450nm
Gauge, the ratio more than 500nm are no more than 10%.
Compared with prior art, the beneficial effects of the invention are as follows：
First product is aoxidized as the raw material for preparing target product using chloride process rutile type titanium dioxide, there is particle close to ball
The features such as type ratio is high, average grain diameter and size distribution are preferable.Product is combined using appropriate clad, and wherein first layer uses
Fine and close hydrated silica coating effectively compensates for the photochemistry point of product, ensures the excellent weather resistance of product；Pass through setting
Temperature of plate controls pH value in reaction and covering material concentration, to adjust the density of cladding, successfully introduces ultra tiny silicic acid aluminium film
For layer for the second main film layer, which is netted film layer, has more porosity, so as to ensure that the high lockedin air space of product and
High whiteness performance；Outermost layer coats loose aluminium oxide, ensure that titanium dioxide pigment has excellent dispersion performance and filterability
Energy.This method successfully introduces the aluminium hydrosilicate packet of reticular structure on the basis of the coating hydrous silica of tradition, aluminium oxide
It covers, not only covering power and weatherability are all good, but also whiteness is also very excellent.Titanium dioxide pigment obtained has high lockedin air space
Power, weatherability and excellent whiteness, can be widely applied to zero diopter, the building coating of matt and ink etc. has high dry hiding power requirement
Field.
Specific embodiment
The present invention is described further With reference to embodiment, but the application range application of the present invention is not only
Embodiment is confined to, under the premise of technical thought of the invention is not departed from, the various replacements and change made should all be in the present invention
In the range of.
Embodiment 1
1.1st, the rutile titanium dioxide first product powder 400g of chloridising preparation is weighed, deionized water is added in and is configured to concentration
For the slurry of 20wt%, entire coating process adopts pH meter detection slurry pH value, adjusts slurry pH to 8.5 with sodium hydroxide solution, add
Enter sodium silicate solution, the concentration of sodium silicate solution is with SiO2100g/L is calculated as, the addition of sodium silicate solution is with SiO in sodium metasilicate2
Account for TiO2Weight is calculated as 0.2%, disperses 20min；Then be ground, make slurry average grain diameter for 300nm, size distribution with
Quantity meter, the ratio more than 500nm is 8%, and abrasive media is removed from slurry；
1.2nd, the slurry after grinding is heated to 50 DEG C, and maintain this temperature in entire coating process；
1.3rd, 2.0% is disposably added in（With SiO in sodium metasilicate2Account for TiO2Weight meter）Water-soluble metasilicate solution, concentration
With SiO2100 g/L are calculated as, adjust slurry pH value for 5% sulfuric acid solution with mass percentage concentration, sulfuric acid solution is gradually uniformly added into
In slurry, slurry pH is adjusted to 6.0 after sixty minutes, then carries out curing 60min, forms the fine and close unformed silicon oxide film of hydration；
1.4th, by 10.0% in 30min（With SiO in sodium metasilicate2Account for TiO2Weight meter）Water-soluble metasilicate solution is uniform
It adds in slurry, the concentration of water-soluble metasilicate solution is with SiO2It is calculated as 100 g/L, while with the aluminium chloride of a concentration of 80g/L
Solution maintains slurry pH value 7.0, cures 30min, forms loose porous silicic acid hydrate aluminium film；
1.5th, by 3.0% in 30min（With Al in sodium metaaluminate2O3Account for TiO2Weight meter）Water-soluble sodium aluminate solution is equal
In even addition slurry, a concentration of 100 g/L of water-soluble sodium aluminate solution, while maintain slurry pH value with liquor alumini chloridi
7.0,60min is cured, forms loose aqua oxidation aluminium film；
1.6th, the slurry cured in step 1.5 is washed till filter cake resistivity as 15000 Ω cm with 50 DEG C of deionized waters, warp
Filtering, drying, then vapour powder processing is carried out, high covering power titanium dioxide pigment is made.
Embodiment 2
1.1st, the rutile titanium dioxide first product powder 400g of chloridising preparation is weighed, deionized water is added in and is configured to concentration
For 30% slurry, entire coating process adopts pH meter detection slurry pH value, adjusts slurry pH to 10.5 with potassium hydroxide solution, add
Enter potassium silicate solution, the concentration of potassium silicate solution is with SiO2200g/L is calculated as, the addition of potassium silicate solution is with SiO in potassium silicate2
Account for TiO2Weight is calculated as 0.5%, disperses 40min；Then be ground, make slurry average grain diameter for 450nm, size distribution with
Quantity meter, the ratio more than 500nm is 9%, and abrasive media is removed from water slurry；
1.2nd, the slurry after grinding is heated to 70 DEG C, and maintain this temperature in entire coating process；
1.3rd, 4.0% is disposably added in（With SiO2Account for TiO2Weight meter）Water-soluble potassium silicate solution, concentration is with SiO2Meter
For 200 g/L, slurry pH is uniformly adjusted to 7.0 for 15% hydrochloric acid solution with mass percentage concentration in 90min, cures 30min,
Form the fine and close unformed silicon oxide film of hydration；
1.4th, 5.0% is added in 60min（With SiO2Account for TiO2Weight meter）Water-soluble potassium silicate solution, water-soluble metasilicate
The concentration of solution is with SiO2200 g/L are calculated as, while slurry pH value 7.0 is maintained with the aluminum sulfate solution of a concentration of 100g/L, it is ripe
Change 30min, form loose porous silicic acid hydrate aluminium film；
1.5th, 8.0% is added in 60min（With Al2O3Account for TiO2Weight meter）Water-soluble potassium metaaluminate solution, water-soluble inclined aluminium
A concentration of 200 g/L of sour potassium solution, while slurry pH is maintained to cure 120min 8.0 with 15% hydrochloric acid solution, it is formed loose
Aqua oxidation aluminium film；
1.7th, slurry in step 1.5 is washed till filter cake resistivity as 22000 Ω cm with 80 DEG C of deionized waters, passed through
Filter, drying, then vapour powder processing is carried out, it is made high and covers titanium dioxide pigment.
Embodiment 3
1.1st, the rutile titanium dioxide first product powder 400g of chloridising preparation is weighed, deionized water is added in and is configured to concentration
For 25% slurry, entire coating process adopts pH meter detection slurry pH value, adjusts slurry pH to 9.5 with potassium hydroxide solution, add in
Sodium silicate solution, the concentration of sodium silicate solution is with SiO2150g/L is calculated as, the addition of sodium silicate solution is with dioxy in sodium metasilicate
SiClx accounts for titanium dioxide first product weight and is calculated as 0.3%, disperses 30min；Then it is ground, makes slurry average grain diameter for 250nm,
In quantitative terms, the ratio more than 500nm is 8.5% to size distribution, and abrasive media is removed from water slurry；
1.2nd, the slurry after grinding is heated to 60 DEG C, and maintain this temperature in entire coating process；
1.3rd, 3.5% is disposably added in（With SiO2Account for TiO2Weight meter）Water-soluble metasilicate solution, water-soluble metasilicate are molten
The concentration of liquid is with SiO2150g/L is calculated as, is uniformly adjusted to slurry pH for 10% salpeter solution with mass percentage concentration in 90min
6.5,60min is cured, forms the fine and close unformed silicon oxide film of hydration；
1.4th, 7.5% is added in 45min（With SiO2Account for TiO2Weight meter）Water-soluble metasilicate solution, water-soluble metasilicate
The concentration of solution is with SiO2150 g/L are calculated as, while slurry pH value 7.0 is maintained with aluminum nitrate solution, 60min is cured, is formed and dredged
The porous silicic acid hydrate aluminium film of pine；
1.5th, 4.5% is added in 45min（With Al2O3Account for TiO2Weight meter）Water-soluble sodium aluminate solution, water-soluble inclined aluminium
A concentration of 150 g/L of acid sodium solution, while slurry pH is maintained 7.0 with the aluminum nitrate solution of a concentration of 90g/L, curing
90min forms loose aqua oxidation aluminium film；
1.6th, slurry in step 1.5 is washed till filter cake resistivity as 15000 Ω cm with 60 DEG C of deionized waters, passed through
Filter, drying, then vapour powder processing is carried out, it is made high and covers titanium dioxide pigment.
Comparative example 1
1.1st, the rutile titanium dioxide first product powder 400g of chloridising preparation is weighed, deionized water is added in and is configured to concentration
For 25% slurry, entire coating process adopts pH meter detection slurry pH value, adjusts slurry pH to 9.5 with potassium hydroxide solution, add in
Sodium silicate solution, the concentration of sodium silicate solution is with SiO2150g/L is calculated as, the addition of sodium silicate solution is with dioxy in sodium metasilicate
SiClx accounts for titanium dioxide first product weight and is calculated as 0.3%, disperses 30min；Then it is ground, makes slurry average grain diameter for 250nm,
In quantitative terms, the ratio more than 500nm is 8.5% to size distribution, and abrasive media is removed from water slurry；
1.2nd, the slurry after grinding is heated to 60 DEG C, and maintain this temperature in entire coating process；
1.3rd, 11.0% is added in 60min（TiO is accounted for SiO22Weight meter）Water-soluble metasilicate solution, water-soluble silicic acid
The concentration of sodium solution is with SiO2150 g/L are calculated as, while slurry pH value 7.0 is maintained with aluminum nitrate solution, cure 30min；
1.4th, 4.5% is added in 45min（With Al2O3Account for TiO2Weight meter）Water-soluble sodium aluminate solution, water-soluble inclined aluminium
A concentration of 150 g/L of acid sodium solution, while slurry pH is maintained 7.0 with the aluminum nitrate solution of a concentration of 90g/L, curing
90min forms loose aqua oxidation aluminium film；
1.5th, slurry in step 1.5 is washed till filter cake resistivity as 15000 Ω cm with 60 DEG C of deionized waters, passed through
Filter, drying, then vapour powder processing is carried out, it is made high and covers titanium dioxide pigment.
Comparative example 2
1.1st, the rutile titanium dioxide first product powder 400g of chloridising preparation is weighed, deionized water is added in and is configured to concentration
For 25% slurry, entire coating process adopts pH meter detection slurry pH value, adjusts slurry pH to 9.5 with potassium hydroxide solution, add in
Sodium silicate solution, the concentration of sodium silicate solution is with SiO2150g/L is calculated as, the addition of sodium silicate solution is with dioxy in sodium metasilicate
SiClx accounts for titanium dioxide first product weight and is calculated as 0.3%, disperses 30min；Then it is ground, makes slurry average grain diameter for 250nm,
In quantitative terms, the ratio more than 500nm is 8.5% to size distribution, and abrasive media is removed from water slurry；
1.2nd, the slurry after grinding is heated to 60 DEG C, and maintain this temperature in entire coating process；
1.3rd, 3.5% is disposably added in（With SiO2Account for TiO2Weight meter）Water-soluble metasilicate solution, water-soluble metasilicate are molten
The concentration of liquid is with SiO2150g/L is calculated as, is uniformly adjusted to slurry pH for 10% salpeter solution with mass percentage concentration in 90min
6.5,60min is cured, forms the fine and close unformed silicon oxide film of hydration；
1.4th, 7.5% is added in 45min（With SiO2Account for TiO2Weight meter）Water-soluble metasilicate solution, water-soluble metasilicate
The concentration of solution is with SiO2150 g/L are calculated as, while slurry pH value 7.0 is maintained with 10% salpeter solution, cure 30min；
1.5th, 4.5% is added in 45min（With Al2O3Account for TiO2Weight meter）Water-soluble sodium aluminate solution, water-soluble inclined aluminium
A concentration of 150 g/L of acid sodium solution, while slurry pH is maintained 7.0 with the aluminum nitrate solution of a concentration of 90g/L, curing
90min forms loose aqua oxidation aluminium film；
1.6th, slurry in step 1.5 is washed till filter cake resistivity as 15000 Ω cm with 60 DEG C of deionized waters, passed through
Filter, drying, then vapour powder processing is carried out, it is made high and covers titanium dioxide pigment.
Titanium dioxide pigment testing result prepared by 1~embodiment of embodiment 3, comparative example 1, comparative example 2 such as 1 institute of table
Show.Wherein the inspection after paint plate is made for the said goods in the latex paint formulation of high pigment volume concentration (PVC) for covering power, whiteness index
It surveys as a result, whiteness detection mode is to take the latex vehicle prepared in right amount, is placed on regulation blank, is prepared using automatic coating machine
Plate is painted, after drying, paint plate whiteness value is detected using spectrophotometer, numerical value is bigger, and whiteness is better.Table 1 is product in embodiment
Index of correlation and using index.
Table 1
| L | It is acid-soluble | Specific surface area | Covering power | Whiteness | |
| Embodiment 1 | 98.35 | 0.58 | 55.4 | 93.7 | 92.9 |
| Embodiment 2 | 98.33 | 0.41 | 51.3 | 92.9 | 92.1 |
| Embodiment 3 | 98.30 | 0.45 | 54.1 | 93.2 | 92.5 |
| Comparative example 1 | 98.36 | 1.93 | 56.2 | 90.6 | 92.8 |
| Comparative example 2 | 98.25 | 0.42 | 42.5 | 88.5 | 91.4 |
It can be seen that from the comparison of upper table embodiment 1- examples 3：The index of correlation of above three sample and the brightness of application index, acid
Dissolubility, specific surface area and paint plate covering power, whiteness indicator difference very little；It is acid-soluble（That is weatherability）Have with fine and close silicon coating condition
It closes, i.e., film layer is finer and close, and weatherability is better；Specific surface area index is related with the clad compactness of product, and film layer is more loose, than
Surface area is bigger, and covering power performance of the product in emulsion paint prepares paint plate is better.
It can be seen that in comparative example 1 and 3 comparison result of embodiment, after cancelling the fine and close silicon fiml of cladding, increase and coat loose silicon fiml
Amount, the specific surface area increase of product, covering power of the product in plate is painted is also opposite to be improved, but product is acid-soluble（Weatherability）Refer to
Mark becomes far short of what is expected, it is impossible to meet emulsion paint very well.
Comparative example 2 can be seen that coating hydrous alumina silicate substitutes aqua oxidation silicon fiml, product with 3 comparison result of embodiment
It is acid-soluble（Weatherability）Index is suitable, but product specific surface area table is small, and covering power, whiteness of the product in plate is painted reduce very much,
There is larger gap with product of the present invention.
It can be seen that the titanium dioxide pigment of specific preparation method production according to the invention is in high pigment volume concentration (PVC) breast
Have the characteristics of high covering power, high whiteness, weather resistance is good in shellac varnish coating, and titanium dioxide face is prepared using this method
Expect that production cost is low, raw material availability is high, is conducive to energy conservation and environmental protection.
Claims (7)
1. a kind of preparation method with high covering power, high-weatherability, high whiteness titanium dioxide pigment, it is characterized in that：
It is as follows：
（1）Using chloridising prepare rutile titanium dioxide first product, be beaten to obtain mass concentration using deionized water be
The titania slurry of 20%-30% adjusts slurry pH value to 8.5~10.5 with inorganic lye；Add in water-soluble silicate solution
As dispersant, the addition of water-soluble silicate solution is with SiO2Account for TiO2Weight is calculated as 0.2%~0.5%, and dispersion 20min~
40min, and carry out milled processed；
（2）Slurry after grinding is warming up to 50 DEG C~70 DEG C, and maintain this temperature in entire coating process；
（3）Disposable to add in water-soluble silicate solution, the addition of water-soluble silicate solution is with SiO2Account for TiO2Weight is calculated as
2.0%~4.0%, in 60min~90min with mass concentration be 5%~15% inorganic acid solution by slurry pH value to 6.0~
7.0,30~60min is cured, forms the fine and close unformed silicon oxide film of hydration；
（4）In 30min~60min, water-soluble silicate solution is added in, the addition of water-soluble silicate solution is with SiO2It accounts for
TiO2Weight is calculated as 5.0%~10.0%, while maintains slurry pH value 7.0 with acid aluminium salt solution, cures 30min~60min, shape
Into loose porous silicic acid hydrate aluminium film；
（5）In 30min~60min, the addition of water-soluble alkaline aluminum salt solution, wherein water-soluble alkaline aluminum salt solution is added in
With Al2O3Account for TiO2Weight is calculated as 3.0%~8.0%, add in inorganic acid solution or acid aluminium salt solution maintain slurry pH value 7.0~
8.0, cure 60min~120min；
（6）By step（5）The slurry of middle curing is washed till filter cake conductivity more than 15000 Ω with 50 DEG C~80 DEG C deionized waters
Cm, then be dried, the processing of vapour powder, high covering power titanium dioxide pigment is made.
2. the preparation method with high covering power, high-weatherability, high whiteness titanium dioxide pigment according to claim 1,
It is characterized in that：Step（1）、（3）With（4）Described in water-soluble silicate solution be sodium silicate solution or potassium silicate solution, it is water-soluble
Property silicate solution concentration is with SiO2It is calculated as 100 g/L~200g/L.
3. the preparation method with high covering power, high-weatherability, high whiteness titanium dioxide pigment according to claim 1,
It is characterized in that：Step（1）Described in inorganic lye for sodium hydroxide solution, in potassium hydroxide, solution is at least one.
4. the preparation method with high covering power, high-weatherability, high whiteness titanium dioxide pigment according to claim 1,
It is characterized in that：Step（4）With（5）Described in acid aluminium salt solution be aluminum trichloride solution, aluminum nitrate solution, in aluminum sulfate solution
At least one, acid aluminium salt solution concentration is with Al2O3It is calculated as 80 g/L~100g/L.
5. the preparation method with high covering power, high-weatherability, high whiteness titanium dioxide pigment according to claim 1,
It is characterized in that：Step（5）The water-soluble alkaline aluminum salt solution is water-soluble aluminum acid sodium solution or water-soluble aluminic acid potassium solution, water
Insoluble basic aluminum salt solution concentration is with Al2O3It is calculated as 100 g/L~200g/L.
6. the preparation method with high covering power, high-weatherability, high whiteness titanium dioxide pigment according to claim 1,
It is characterized in that：Step（3）With（5）The inorganic acid solution is hydrochloric acid solution, sulfuric acid solution, salpeter solution, in phosphoric acid solution extremely
Few one kind.
7. the preparation method with high covering power, high-weatherability, high whiteness titanium dioxide pigment according to claim 1,
It is characterized in that：Milled processed makes titania slurry average grain diameter for 250nm~450nm, and size distribution in quantitative terms, surpasses
The ratio for crossing 500nm is no more than 10%.
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| CN111393876B (en) * | 2020-04-30 | 2021-06-08 | 龙蟒佰利联集团股份有限公司 | Preparation method of high-covering and high-gloss titanium dioxide |
| CN112538283A (en) * | 2020-11-30 | 2021-03-23 | 攀钢集团重庆钛业有限公司 | Preparation method of high-weather-resistance and high-covering titanium dioxide |
| CN113174148B (en) * | 2021-04-20 | 2022-05-06 | 河南佰利联新材料有限公司 | White pigment for self-cleaning external wall and preparation method thereof |
| CN114874696B (en) * | 2021-06-25 | 2023-12-12 | 上海维巳达实业有限公司 | High-temperature-resistant paint for spray marks and preparation method thereof |
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