CN106497147A - A kind of preparation method with high covering power, high-weatherability and high whiteness TiO 2 pigment - Google Patents

A kind of preparation method with high covering power, high-weatherability and high whiteness TiO 2 pigment Download PDF

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CN106497147A
CN106497147A CN201610936778.2A CN201610936778A CN106497147A CN 106497147 A CN106497147 A CN 106497147A CN 201610936778 A CN201610936778 A CN 201610936778A CN 106497147 A CN106497147 A CN 106497147A
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solution
water
tio
slurry
soluble
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CN106497147B (en
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臧颖波
姜志刚
王建伟
李俊强
刘立新
付岩
李冬旭
马玉杰
李东丹
任健
穆宇同
吴琼
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CITIC Titanium Industry Co Ltd
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Jinzhou Titanium Industry Co Ltd
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    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK  ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
    • C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
    • C09C1/36—Compounds of titanium
    • C09C1/3607—Titanium dioxide
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK  ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
    • C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
    • C09C1/36—Compounds of titanium
    • C09C1/3607—Titanium dioxide
    • C09C1/3615—Physical treatment, e.g. grinding, treatment with ultrasonic vibrations
    • C09C1/3623—Grinding
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    • C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
    • C09C1/36—Compounds of titanium
    • C09C1/3607—Titanium dioxide
    • C09C1/3653—Treatment with inorganic compounds
    • C09C1/3661—Coating
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    • C09C3/00—Treatment in general of inorganic materials, other than fibrous fillers, to enhance their pigmenting or filling properties
    • C09C3/006—Combinations of treatments provided for in groups C09C3/04 - C09C3/12
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    • C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK  ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
    • C09C3/00—Treatment in general of inorganic materials, other than fibrous fillers, to enhance their pigmenting or filling properties
    • C09C3/04—Physical treatment, e.g. grinding, treatment with ultrasonic vibrations
    • C09C3/041—Grinding
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    • C09C3/00—Treatment in general of inorganic materials, other than fibrous fillers, to enhance their pigmenting or filling properties
    • C09C3/06—Treatment with inorganic compounds
    • C09C3/063—Coating
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    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/60—Additives non-macromolecular
    • C09D7/61—Additives non-macromolecular inorganic
    • C09D7/62—Additives non-macromolecular inorganic modified by treatment with other compounds
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2006/00—Physical properties of inorganic compounds
    • C01P2006/60—Optical properties, e.g. expressed in CIELAB-values
    • C01P2006/65—Chroma (C*)
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2006/00—Physical properties of inorganic compounds
    • C01P2006/90—Other properties not specified above

Abstract

A kind of preparation method with high covering power, high-weatherability and high whiteness TiO 2 pigment, using titanium dioxide first product, is beaten in water, is configured to slurry, adds water-soluble silicate solution as dispersant, carries out milled processed after curing；Slurry is heated up, water-soluble silicate solution is added, pH value is adjusted using inorganic acid, after curing, form the unformed silicon oxide film of fine and close hydration；Add water-soluble silicate solution again, slurry pH value is maintained using acid aluminum contained compound, loose porous film layer based on aluminium hydrosilicate is formed after curing, it is ensured that high covering power and whiteness performance；Loose aqua oxidation aluminium film is finally coated, it is ensured that product excellent dispersion performance；Filtration washing, drying, gas powder, bag hose are reclaimed and obtain finished product.Advantage is：TiO 2 pigment prepared by the method except covering power is excellent in addition to, low production cost good with high durable, whiteness, can be widely applied to zero diopter, the building coating of Asia light and ink etc. has the field of high dry hiding power requirement.

Description

A kind of preparation with high covering power, high-weatherability and high whiteness TiO 2 pigment Method
Technical field
The present invention relates to a kind of in chemical field have high covering power, high-weatherability, high whiteness TiO 2 pigment Preparation method.
Background technology
Titanium dioxide is one of most important fine chemical material, becomes purposes because refractive index height, reducing power and covering power are high Most wide Chinese white, is referred to as " king of Chinese white ".By extensively should be due to coating, plastics, papermaking, rubber, chemical fibre In etc. industrial production.Wherein coating industry is maximum using titanium dioxide amount, accounts for more than the 60% of total amount, and titanium white powder pigment is coating Important component part, its objective is to play a part of to 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 as water paint in one kind, with green, environmental protection the characteristics of, in recent years To be favored by client all the more.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 higher and higher requirement.Architectural latex coating coating has high pigment volume concentration (PVC), and its covering power is Specific refractivity and TiO 2 pigment and emulsion resin and titanium dioxide face by air in TiO 2 pigment and hole Expect to together decide on the specific refractivity of water, severe coating process is therefore carried out to TiO 2 pigment, increases titanium dioxide face The surface porosity factor of material come improve covering power performance of the TiO 2 pigment in emulsion paint coating become one extensive Technology.
US 3510335 discloses a kind of in the loose porous silicon dioxide film of titania-alumina oxide surface cladding Layer, through 300 DEG C of -1000 DEG C of calcine technologies after, the method for a kind of fastness of preparation and high covering power titanium dioxide.US 3437502 Disclose a kind of production method of TiO 2 pigment, by one layer of dense oxide silicon fiml of TiO 2 particles Surface coating, Pellumina, so that obtain a kind of TiO 2 pigment of good dispersion with high covering power and in aqueous coating formulation.
Chinese patent CN101885926 discloses a kind of production method of rutile type titanium white powder with high hiding power, by acid Property the fine and close aqua oxidation silicon fiml of cladding, loose aqua oxidation silicon fiml and pellumina, improve the covering power of product, and keep which high Whiteness and the method for basic weather resistance.
At present, domestic and international titanium dioxide performance（Such as covering power, weatherability, whiteness）Raising general using reality by the way of coating Existing.Through substantial amounts of experimental studies have found that, titanium dioxide is coated through hydrated silica, alumina surface, the screening to product really Lid power performance is improved effect, but can bring adverse effect to product whiteness performance, using the silicon oxide coated product of acid hydration 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 Urgently developed with improving the method for coating of the weatherability and whiteness of product simultaneously.
Content of the invention
The technical problem to be solved in the present invention is to provide a kind of preparation method of TiO 2 pigment, two obtained in the method Titanium oxide pigments are applied in building coating, and there is high covering power not only, while having weatherability height, whiteness good and tinting strength, tinting power High the characteristics of, the TiO 2 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, which comprises the following steps that：
（1）The rutile titanium dioxide first product prepared using chloridising, obtaining mass concentration using deionized water beating is The titania slurry of 20%-30%, adjusts slurry pH value to 8.5～10.5 with inorganic alkali lye；Add water-soluble silicate solution Used 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 by grinding is warming up to 50 DEG C～70 DEG C, and maintains this temperature in whole coating process；
（3）Disposable addition water-soluble silicate solution, the addition of water-soluble silicate solution is with SiO2Account for TiO2Weight meter For 2.0%～4.0%, in 60min～90min with the inorganic acid solution that mass concentration is 5%～15% by slurry pH value to 6.0～ 7.0,30～60min is cured, the unformed silicon oxide film of fine and close hydration is formed；
（4）In 30min～60min, water-soluble silicate solution is added, the addition of water-soluble silicate solution is with SiO2Account for TiO2Weight is calculated as 5.0%～10.0%, while maintaining slurry pH value 7.0 with bialuminate solution, cures 30min～60min, Form loose porous silicate hydrate aluminium film；
（5）In 30min～60min, water-soluble alkaline aluminum salt solution, the wherein addition of water-soluble alkaline aluminum salt solution is added With Al2O3Account for TiO2Weight is calculated as 3.0%～8.0%, add inorganic acid solution or acid aluminium salt solution maintain slurry pH value 7.0～ 8.0,60min～120min is cured, loose aqua oxidation aluminium film is formed；
（6）By step（5）50 DEG C～80 DEG C deionized waters of the slurry of middle curing are washed till filter cake electrical conductivity more than 15000 Ω Cm, then be dried, vapour powder process, be obtained high covering power titanium dioxide pigment.
Further, step（1）、（3）With（4）Described in water-soluble silicate solution be sodium silicate solution or potassium silicate 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 be sodium hydroxide solution, solution at least one in potassium hydroxide Kind.
Further, step（4）With（5）Described in acid aluminium salt solution be 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, makes titania slurry average grain diameter for 250nm～450nm, and size distribution is with number Gauge, the ratio more than 500nm are less than 10%.
Compared with prior art, the invention has the beneficial effects as follows：
Using chloride process rutile type titanium dioxide oxidation first product as the raw material for preparing target product, ball-type ratio is close to particle The features such as high, average grain diameter of example and preferable size distribution.Product is combined using appropriate clad, and wherein ground floor is using fine and close Hydrated silica coating, effectively compensate for the photochemistry point of product, it is ensured that the excellent weather resistance of product；Coated by setting Temperature, control pH value in reaction and covering material concentration, adjust the density of cladding, and successfully introducing ultra tiny silicic acid aluminum membranous layer is Second main film layer, the main film layer are netted film layer, with more porosity, so as to ensure that the high lockedin air space and Gao Bai of product Degree performance；Outermost layer coats loose aluminum oxide, it is ensured that TiO 2 pigment has excellent dispersive property and strainability.Should Method successfully introduces cancellated aluminium hydrosilicate cladding, not only in traditional coating hydrous silica on the basis of aluminum oxide Covering power is all good with weatherability, and whiteness is also very excellent.Obtained TiO 2 pigment has high dry hiding power, weatherability And excellent whiteness, can be widely applied to zero diopter, the building coating of sub- light and ink etc. has the field of high dry hiding power requirement.
Specific embodiment
The present invention is described further with reference to specific embodiment, but the range of application application of the present invention is not only Embodiment is confined to, on the premise of without departing from the technology of the present invention thought, the various replacements that makes and change all should 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, and addition deionized water is configured to concentration and is PH meter detection slurry pH value adopted by the slurry of 20wt%, whole coating process, adjusts slurry pH to 8.5 with sodium hydroxide solution, adds 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 metasilicate2Account for TiO2Weight is calculated as 0.2%, disperses 20min；Then it is ground, makes slurry average grain diameter for 300nm, size distribution is with number Gauge, the ratio more than 500nm are 8%, remove abrasive media from slurry；
1.2nd, by grinding after slurry be heated to 50 DEG C, and maintain this temperature in whole coating process；
1.3rd, 2.0% is disposably added（With SiO in sodium metasilicate2Account for TiO2Weight meter）Water-soluble metasilicate solution, its concentration with SiO2100 g/L are calculated as, are that 5% sulfuric acid solution adjusts slurry pH value with mass percentage concentration, sulfuric acid solution is gradually uniformly added into slurry In material, slurry pH is adjusted to 6.0 after 60 minutes, then carries out curing 60min, form the unformed silicon oxide film of fine and close hydration；
1.4th, by 10.0% in the 30min（With SiO in sodium metasilicate2Account for TiO2Weight meter）Water-soluble metasilicate solution is uniformly added into In slurry, the concentration of water-soluble metasilicate solution is with SiO2100 g/L are calculated as, while with the liquor alumini chloridi that concentration is 80g/L Slurry pH value 7.0 is maintained, 30min is cured, loose porous silicate hydrate aluminium film is formed；
1.5th, by 3.0% in 30min（With Al in sodium metaaluminate2O3Account for TiO2Weight meter）Water-soluble sodium aluminate solution uniformly adds Enter in slurry, the concentration of water-soluble sodium aluminate solution is 100 g/L, while slurry pH value 7.0 is maintained with liquor alumini chloridi, ripe Change 60min, form loose aqua oxidation aluminium film；
1.6th, the slurry cured in step 1.5 is washed till filter cake resistivity for 15000 Ω cm with 50 DEG C of deionized waters, was passed through Filter, dry, then carry out vapour powder process, high covering power titanium dioxide pigment is obtained.
Embodiment 2
1.1st, the rutile titanium dioxide first product powder 400g of chloridising preparation is weighed, and addition deionized water is configured to concentration and is PH meter detection slurry pH value adopted by 30% slurry, whole coating process, adjusts slurry pH to 10.5 with potassium hydroxide solution, adds 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 silicate2Account for TiO2Weight is calculated as 0.5%, disperses 40min；Then it is ground, makes slurry average grain diameter for 450nm, size distribution is with number Gauge, the ratio more than 500nm are 9%, remove abrasive media from water slurry；
1.2nd, by grinding after slurry be heated to 70 DEG C, and maintain this temperature in whole coating process；
1.3rd, 4.0% is disposably added（With SiO2Account for TiO2Weight meter）Water-soluble potassium silicate solution, its concentration is with SiO2It is calculated as 200 Slurry pH in 90min is uniformly adjusted to 7.0 with mass percentage concentration for 15% hydrochloric acid solution, cures 30min, formed and caused by g/L The unformed silicon oxide film of close hydration；
1.4th, 5.0% is added in 60min（With SiO2Account for TiO2Weight meter）Water-soluble potassium silicate solution, water-soluble metasilicate are molten The concentration of liquid is with SiO2200 g/L are calculated as, while slurry pH value 7.0, curing is maintained with the aluminum sulfate solution that concentration is 100g/L 30min, forms loose porous silicate hydrate aluminium film；
1.5th, 8.0% is added in 60min（With Al2O3Account for TiO2Weight meter）Water-soluble potassium metaaluminate solution, water-soluble potassium metaaluminate The concentration of solution is 200 g/L, while maintaining slurry pH 8.0 with 15% hydrochloric acid solution, cures 120min, forms loose hydration Pellumina；
1.7th, slurry in step 1.5 is washed till filter cake resistivity for 22000 Ω cm with 80 DEG C of deionized waters, through filtering, doing Dry, then vapour powder process is carried out, high covering TiO 2 pigment is obtained.
Embodiment 3
1.1st, the rutile titanium dioxide first product powder 400g of chloridising preparation is weighed, and addition deionized water is configured to concentration and is PH meter detection slurry pH value adopted by 25% slurry, whole coating process, adjusts slurry pH to 9.5 with potassium hydroxide solution, adds silicon Acid sodium solution, the concentration of sodium silicate solution is with SiO2150g/L is calculated as, the addition of sodium silicate solution is with titanium dioxide in sodium metasilicate Silicon accounts for titanium dioxide first product weight and is calculated as 0.3%, disperses 30min；Then be ground, slurry average grain diameter is made for 250nm, grain In quantitative terms, the ratio more than 500nm is 8.5% for degree distribution, removes abrasive media from water slurry；
1.2nd, by grinding after slurry be heated to 60 DEG C, and maintain this temperature in whole coating process；
1.3rd, 3.5% is disposably added（With SiO2Account for TiO2Weight meter）Water-soluble metasilicate solution, water-soluble metasilicate solution Concentration is with SiO2150g/L is calculated as, in 90min, uniformly slurry pH is adjusted to 6.5 with mass percentage concentration for 10% salpeter solution, Curing 60min, forms the unformed silicon oxide film of fine and close hydration；
1.4th, 7.5% is added in 45min（With SiO2Account for TiO2Weight meter）Water-soluble metasilicate solution, water-soluble metasilicate are molten The concentration of liquid is with SiO2150 g/L are calculated as, while slurry pH value 7.0 is maintained with aluminum nitrate solution, are cured 60min, are formed loose Porous silicate hydrate aluminium film；
1.5th, 4.5% is added in 45min（With Al2O3Account for TiO2Weight meter）Water-soluble sodium aluminate solution, water-soluble sodium metaaluminate The concentration of solution is 150 g/L, while maintaining slurry pH 7.0 with the aluminum nitrate solution that concentration is 90g/L, cures 90min, shape Into loose aqua oxidation aluminium film；
1.6th, slurry in step 1.5 is washed till filter cake resistivity for 15000 Ω cm with 60 DEG C of deionized waters, through filtering, doing Dry, then vapour powder process is carried out, high covering TiO 2 pigment is obtained.
Comparative example 1
1.1st, the rutile titanium dioxide first product powder 400g of chloridising preparation is weighed, and addition deionized water is configured to concentration and is PH meter detection slurry pH value adopted by 25% slurry, whole coating process, adjusts slurry pH to 9.5 with potassium hydroxide solution, adds silicon Acid sodium solution, the concentration of sodium silicate solution is with SiO2150g/L is calculated as, the addition of sodium silicate solution is with titanium dioxide in sodium metasilicate Silicon accounts for titanium dioxide first product weight and is calculated as 0.3%, disperses 30min；Then be ground, slurry average grain diameter is made for 250nm, grain In quantitative terms, the ratio more than 500nm is 8.5% for degree distribution, removes abrasive media from water slurry；
1.2nd, by grinding after slurry be heated to 60 DEG C, and maintain this temperature in whole coating process；
1.3rd, 11.0% is added in 60min（TiO is accounted for SiO22Weight meter）Water-soluble metasilicate solution, water-soluble metasilicate are molten The concentration of liquid 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 sodium metaaluminate The concentration of solution is 150 g/L, while maintaining slurry pH 7.0 with the aluminum nitrate solution that concentration is 90g/L, cures 90min, shape Into loose aqua oxidation aluminium film；
1.5th, slurry in step 1.5 is washed till filter cake resistivity for 15000 Ω cm with 60 DEG C of deionized waters, through filtering, doing Dry, then vapour powder process is carried out, high covering TiO 2 pigment is obtained.
Comparative example 2
1.1st, the rutile titanium dioxide first product powder 400g of chloridising preparation is weighed, and addition deionized water is configured to concentration and is PH meter detection slurry pH value adopted by 25% slurry, whole coating process, adjusts slurry pH to 9.5 with potassium hydroxide solution, adds silicon Acid sodium solution, the concentration of sodium silicate solution is with SiO2150g/L is calculated as, the addition of sodium silicate solution is with titanium dioxide in sodium metasilicate Silicon accounts for titanium dioxide first product weight and is calculated as 0.3%, disperses 30min；Then be ground, slurry average grain diameter is made for 250nm, grain In quantitative terms, the ratio more than 500nm is 8.5% for degree distribution, removes abrasive media from water slurry；
1.2nd, by grinding after slurry be heated to 60 DEG C, and maintain this temperature in whole coating process；
1.3rd, 3.5% is disposably added（With SiO2Account for TiO2Weight meter）Water-soluble metasilicate solution, water-soluble metasilicate solution Concentration is with SiO2150g/L is calculated as, in 90min, uniformly slurry pH is adjusted to 6.5 with mass percentage concentration for 10% salpeter solution, Curing 60min, forms the unformed silicon oxide film of fine and close hydration；
1.4th, 7.5% is added in 45min（With SiO2Account for TiO2Weight meter）Water-soluble metasilicate solution, water-soluble metasilicate are molten The concentration of liquid 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 sodium metaaluminate The concentration of solution is 150 g/L, while maintaining slurry pH 7.0 with the aluminum nitrate solution that concentration is 90g/L, cures 90min, shape Into loose aqua oxidation aluminium film；
1.6th, slurry in step 1.5 is washed till filter cake resistivity for 15000 Ω cm with 60 DEG C of deionized waters, through filtering, doing Dry, then vapour powder process is carried out, high covering TiO 2 pigment is obtained.
TiO 2 pigment testing result prepared by 1～embodiment of embodiment 3, comparative example 1, comparative example 2 such as 1 institute of table Show.Wherein covering power, whiteness index are the inspection after the said goods make paint plate in the latex paint formulation of high pigment volume concentration (PVC) Result is surveyed, whiteness detection mode is to take the latex vehicle for preparing in right amount, is placed on regulation blank, prepared using automatic coating machine Paint plate, after drying, using spectrophotometer detection paint plate whiteness value, numerical value is bigger, and whiteness is better.Table 1 is product in embodiment Index of correlation and application index.
Table 1
L 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
Can be seen that from the contrast of upper table embodiment 1- example 3：The index of correlation of above three sample is molten with application index brightness, acid Property, specific surface area and paint plate covering power, whiteness indicator difference very little；Acid-soluble（That is weatherability）Have with fine and close silicon coating condition Close, i.e., film layer is finer and close, and weatherability is better；Specific surface area index is relevant with the clad compactness of product, and film layer is more loose, than Surface area is bigger, and product is better in the covering power performance that emulsion paint is prepared in paint plate.
Can be seen that with 3 comparison result of embodiment in comparative example 1, after cancelling the fine and close silicon fiml of cladding, increase the loose silicon fiml of cladding Amount, the specific surface area increase of product, covering power of the product in paint plate is also relative 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 with 3 comparison result of embodiment coating hydrous alumina silicate substitutes aqua oxidation silicon fiml, product Acid-soluble（Weatherability）Index is suitable, but product specific surface area table is little, and covering power of the product in paint plate, whiteness reduce a lot, There is larger gap with product of the present invention.
As can be seen here, the TiO 2 pigment according to the specific preparation method production of the present invention is newborn in high pigment volume concentration (PVC) Possess high covering power, high whiteness in shellac varnish coating, the characteristics of weather resistance is good, and titanium dioxide face prepared using the method Material low production cost, raw material availability are high, are conducive to energy-conserving and environment-protective.

Claims (7)

1. a kind of with high covering power, high-weatherability, high whiteness TiO 2 pigment preparation method, it is characterized in that：
Comprise the following steps that：
（1）The rutile titanium dioxide first product prepared using chloridising, obtaining mass concentration using deionized water beating is The titania slurry of 20%-30%, adjusts slurry pH value to 8.5～10.5 with inorganic alkali lye；Add water-soluble silicate solution Used 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 by grinding is warming up to 50 DEG C～70 DEG C, and maintains this temperature in whole coating process；
（3）Disposable addition 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 the inorganic acid solution that mass concentration is 5%～15% by slurry pH value to 6.0～ 7.0,30～60min is cured, the unformed silicon oxide film of fine and close hydration is formed；
（4）In 30min～60min, water-soluble silicate solution is added, the addition of water-soluble silicate solution is with SiO2Account for TiO2Weight is calculated as 5.0%～10.0%, while maintaining slurry pH value 7.0 with bialuminate solution, cures 30min～60min, Form loose porous silicate hydrate aluminium film；
（5）In 30min～60min, water-soluble alkaline aluminum salt solution, the wherein addition of water-soluble alkaline aluminum salt solution is added With Al2O3Account for TiO2Weight is calculated as 3.0%～8.0%, add inorganic acid solution or acid aluminium salt solution maintain slurry pH value 7.0～ 8.0, cure 60min～120min；
（6）By step（5）50 DEG C～80 DEG C deionized waters of the slurry of middle curing are washed till filter cake electrical conductivity more than 15000 Ω Cm, then be dried, vapour powder process, be obtained high covering power titanium dioxide pigment.
2. according to claim 1 with high covering power, high-weatherability, high whiteness TiO 2 pigment preparation method, It is characterized in that：Step（1）、（3）With（4）Described in water-soluble silicate solution be sodium silicate solution or potassium silicate solution, water-soluble Property silicate solution concentration is with SiO2It is calculated as 100 g/L～200g/L.
3. according to claim 1 with high covering power, high-weatherability, high whiteness TiO 2 pigment preparation method, It is characterized in that：Step（1）Described in inorganic alkali solution be sodium hydroxide solution, solution is at least one in potassium hydroxide.
4. according to claim 1 with high covering power, high-weatherability, high whiteness TiO 2 pigment preparation method, 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. according to claim 1 with high covering power, high-weatherability, high whiteness TiO 2 pigment preparation method, 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 Dissolubility aluminate solution concentration is with Al2O3It is calculated as 100 g/L～200g/L.
6. according to claim 1 with high covering power, high-weatherability, high whiteness TiO 2 pigment preparation method, It is characterized in that：Step（3）With（5）The inorganic acid solution be hydrochloric acid solution, sulfuric acid solution, salpeter solution, in phosphoric acid solution extremely Few one kind.
7. according to claim 1 with high covering power, high-weatherability, high whiteness TiO 2 pigment preparation method, 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 less than 10%.
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CN107400380B (en) * 2017-07-17 2019-03-26 西藏亚吐克工贸有限公司 The dedicated titanium dioxide process of high gloss paint
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CN108997788A (en) * 2018-08-27 2018-12-14 攀钢集团重庆钛业有限公司 The preparation method of high covering power titanium dioxide
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CN109651848B (en) * 2019-01-29 2020-09-25 河南佰利联新材料有限公司 Preparation method of special titanium dioxide for inner printing ink
CN109762372A (en) * 2019-03-01 2019-05-17 河南佰利联新材料有限公司 A kind of preparation method improving titanium dioxide weatherability
CN109943116A (en) * 2019-03-19 2019-06-28 陈基木 The aqueous resistant protective agent of inorganic mineral and its production technology
CN111100483A (en) * 2019-11-26 2020-05-05 广东盈骅新材料科技有限公司 Titanium suboxide black pigment and preparation method thereof
CN111393876A (en) * 2020-04-30 2020-07-10 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
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