CN101792148B - Method for preparing white carbon black - Google Patents
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- CN101792148B CN101792148B CN2010101064892A CN201010106489A CN101792148B CN 101792148 B CN101792148 B CN 101792148B CN 2010101064892 A CN2010101064892 A CN 2010101064892A CN 201010106489 A CN201010106489 A CN 201010106489A CN 101792148 B CN101792148 B CN 101792148B
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 title claims abstract description 105
- 239000006229 carbon black Substances 0.000 title claims abstract description 58
- 238000000034 method Methods 0.000 title claims abstract description 47
- 239000007787 solid Substances 0.000 claims abstract description 40
- 239000002245 particle Substances 0.000 claims abstract description 30
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 26
- 238000001035 drying Methods 0.000 claims abstract description 14
- 239000002994 raw material Substances 0.000 claims abstract description 12
- 229910052710 silicon Inorganic materials 0.000 claims description 42
- 239000010703 silicon Substances 0.000 claims description 42
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 39
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 31
- 238000002360 preparation method Methods 0.000 claims description 23
- 230000036571 hydration Effects 0.000 claims description 14
- 238000006703 hydration reaction Methods 0.000 claims description 14
- 238000007710 freezing Methods 0.000 claims description 11
- 230000008014 freezing Effects 0.000 claims description 11
- 229910052708 sodium Inorganic materials 0.000 claims description 11
- 239000011734 sodium Substances 0.000 claims description 11
- 238000005057 refrigeration Methods 0.000 claims description 10
- 238000010257 thawing Methods 0.000 claims description 9
- 238000001914 filtration Methods 0.000 claims description 7
- 239000002002 slurry Substances 0.000 claims description 7
- 239000006185 dispersion Substances 0.000 claims description 6
- 229910001415 sodium ion Inorganic materials 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 5
- 238000005192 partition Methods 0.000 claims description 5
- 238000005507 spraying Methods 0.000 claims description 5
- FKNQFGJONOIPTF-UHFFFAOYSA-N Sodium cation Chemical compound [Na+] FKNQFGJONOIPTF-UHFFFAOYSA-N 0.000 claims description 4
- 238000007580 dry-mixing Methods 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 2
- 238000012856 packing Methods 0.000 claims description 2
- 239000000377 silicon dioxide Substances 0.000 abstract description 22
- 235000012239 silicon dioxide Nutrition 0.000 abstract description 17
- 238000000227 grinding Methods 0.000 abstract description 3
- 229910052681 coesite Inorganic materials 0.000 abstract 2
- 229910052906 cristobalite Inorganic materials 0.000 abstract 2
- 229910052682 stishovite Inorganic materials 0.000 abstract 2
- 229910052905 tridymite Inorganic materials 0.000 abstract 2
- KKCBUQHMOMHUOY-UHFFFAOYSA-N Na2O Inorganic materials [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 abstract 1
- 230000008021 deposition Effects 0.000 abstract 1
- 229960001866 silicon dioxide Drugs 0.000 description 13
- 241000872198 Serjania polyphylla Species 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- 235000019353 potassium silicate Nutrition 0.000 description 5
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 5
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 4
- 238000000498 ball milling Methods 0.000 description 4
- 238000009826 distribution Methods 0.000 description 4
- 239000002904 solvent Substances 0.000 description 4
- 239000012808 vapor phase Substances 0.000 description 4
- 208000032544 Cicatrix Diseases 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000005352 clarification Methods 0.000 description 3
- 239000008187 granular material Substances 0.000 description 3
- 239000002105 nanoparticle Substances 0.000 description 3
- 239000011164 primary particle Substances 0.000 description 3
- 230000002787 reinforcement Effects 0.000 description 3
- 238000009738 saturating Methods 0.000 description 3
- 231100000241 scar Toxicity 0.000 description 3
- 230000037387 scars Effects 0.000 description 3
- 150000003376 silicon Chemical class 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 230000032683 aging Effects 0.000 description 2
- 238000010009 beating Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 239000007791 liquid phase Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000003960 organic solvent Substances 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 2
- 238000002791 soaking Methods 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- VXEGSRKPIUDPQT-UHFFFAOYSA-N 4-[4-(4-methoxyphenyl)piperazin-1-yl]aniline Chemical compound C1=CC(OC)=CC=C1N1CCN(C=2C=CC(N)=CC=2)CC1 VXEGSRKPIUDPQT-UHFFFAOYSA-N 0.000 description 1
- 239000005046 Chlorosilane Substances 0.000 description 1
- 206010013786 Dry skin Diseases 0.000 description 1
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 1
- KEAYESYHFKHZAL-UHFFFAOYSA-N Sodium Chemical compound [Na] KEAYESYHFKHZAL-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000008033 biological extinction Effects 0.000 description 1
- KOPOQZFJUQMUML-UHFFFAOYSA-N chlorosilane Chemical compound Cl[SiH3] KOPOQZFJUQMUML-UHFFFAOYSA-N 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000009878 intermolecular interaction Effects 0.000 description 1
- 239000005543 nano-size silicon particle Substances 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 238000000053 physical method Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000005049 silicon tetrachloride Substances 0.000 description 1
- -1 siloxanes Chemical class 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
Landscapes
- Silicon Compounds (AREA)
Abstract
The invention relates to a method for preparing white carbon black. Silica solution is used as the raw material, wherein in the silica solution, the pH value is between 2.0 and 12; the proportion is between 1.14 and 1.3g/cm<3>; the content of SiO2 is between 20 and 40 percent; the water content is between 59.6 and 79.96 percent; the content of Na2O is between 0.04 and 0.40 percent; and the grain diameter of SiO2 colloidal particles is between 5 and 40nm. The method comprises the following steps: firstly putting the silica solution into a container and putting the container into a refrigerating room to cool until the whole silica solution is frozen; then taking the container out, and unfreezing the container to obtain a layer of flake-like transparent hydrous silicon dioxide solid deposition at the bottom of the container and water on the upper part of the container; and separating solid on the bottom of the container out and grinding and drying the solid to obtain the white carbon black. The method has simple process, low cost, universal equipment and small investment and high purity and easy grinding of the prepared flake-like silicon dioxide solid.
Description
Technical field
The present invention relates to a kind of preparation method of white carbon black.
Background technology
White carbon black be a kind of be the soft silica nano particle of dozens of nanometer by primary particle size, form micron-sized second particle by intermolecular interaction or other physics chemical action, countless second particles are piled up light weight, the fluffy powder that forms.Because primary particle size carefully reaches nanometer scale, the white carbon black nano white carbon black that is otherwise known as.White carbon black has nano level primary particle size, has great specific surface area, high purity, thereby shows many performances: remarkable reinforcement, thickening property, thixotropy, extinction, dispersiveness, insulativity or the like.Be widely used in industries such as rubber, plastics, coating, paint, medicine, papermaking, electronics, daily use chemicals.
The preparation method of at present white carbon black mainly contains vapor phase process and liquid-phase precipitation method, defectives such as these preparation method's ubiquity expensive raw material price, equipment requirements height, complex process.
Vapor phase process is with silicoorganic compound such as silicon tetrachloride, chlorosilane or siloxanes and hydrogen, oxygen mixture generation combustion reactions, produces the silica dioxide granule of nano-scale, through separate, depickling obtains the white carbon black of vapor phase process.This method investment is huge, and equipment and technical requirements are very high, and energy consumption and pollution are all very big, and the white carbon black cost of the vapor phase process that obtains is very high.
Liquid phase method mainly adopts the water glass (being water glass) of prepared in various methods as raw material, through the removal of impurity, be acidified with acid precipitate, wear out, processing steps such as filtration, washing, pulverizing.Also there are weak points such as the white black grain diameter distribution range of complex process, conversion unit requirement height, preparation is big, the easy reunion of particle in this method.
The Chinese patent communique has announced that publication number is that CN101332994A, denomination of invention are the application documents of " preparation method of the white carbon black of a kind of reinforcement ", it has introduced a kind of preparation method of white carbon black, uses water glass as raw material, and preparation process comprises and adds sulfuric acid reaction, aging, heated and stirred is regulated the pH value, once more reacting by heating, filter, making beating, drying and other steps obtains white carbon black, and technology is very complicated.
The Chinese patent communique has announced that another part publication number is that CN1424362A, denomination of invention are the application documents of " method for preparing nano white carbon black with silicon sol ", it has introduced a kind of method for preparing white carbon black with silicon sol, by in silicon sol, adding ethanol or Virahol, obtain the gelatinous precipitate of silicon-dioxide after the adjusting potential of hydrogen, after exchange of solvent, drying and other steps, make nano white carbon black again.This method has been used organic solvent, difficult solvent recovery, and the gluey precipitation of the silicon-dioxide that obtains is dry difficult, also exists cost higher, the shortcoming of complex process.
In a word, still do not find at present both at home and abroad the preparation method of high-purity, ultra-fine white carbon black simple, with low cost.
Summary of the invention
The object of the present invention is to provide the preparation method of the white carbon black that a kind of technology is simple, with low cost, investment is low.
The present invention uses silicon sol to be raw material, by the freezing simple physical method of thawing again of elder generation the nano particle in the silicon sol is separated, thereby is prepared white carbon black.
The technological process of this method is as follows:
(1) choose raw silicon colloidal sol, its partition is calculated by weight percentage:
Choose pH and be 2.0～12, proportion is 1.14～1.3g/cm
3, SiO
2Content is 20%～40%, water content is 59.6%～79.96%, Na
2O content is 0.04%～0.40%, SiO
2The silicon sol of the particle diameter of colloidal solid between 5～40nm is raw material;
(2) by first freezing method of thawing again with SiO
2From silicon sol, separate:
With the silicon sol container of packing into, it is icing fully to integral body to be placed on the refrigeration chamber internal cooling, and will fill the freeze container of body of silicon sol then and shift out refrigeration chamber and thaw, after treating to thaw fully, hydration SiO
2Promptly and water sepn, be deposited on container bottom, by filtering method this sheet settling separated then with transparent sheet-like particulate form;
(3) adopt the levigate or described hydration SiO of dry ground of wet method
2The transparent sheet-like granular deposit obtain white carbon black.
As hydration SiO
2The transparent sheet-like granular deposit in sodium ions content need soak purification process when higher:
With the freezing hydration SiO that thaws again and obtain of elder generation
2The transparent sheet-like granular deposit with pure water soak, filtration treatment to be to remove by hydration SiO
2Carrying together isolated a small amount of sodium ion from water secretly, soaking, filter number of times and decide as required.
Can adopt the levigate hydration SiO of wet method
2The transparent sheet-like granular deposit obtain white carbon black:
With the hydration SiO that obtains
2Transparent sheet-like granular deposit and water mix by 1: 5～5: 1 mass ratio, grind to form the water dispersion slurry with ball mill or agitating ball mill, then this slurry is carried out spraying drying, obtain white carbon black.
Also can adopt dry ground to obtain white carbon black:
With the hydration SiO that obtains
2The transparent sheet-like granular deposit through 90～105 ℃ of dryings after, utilize dry method ball mill or dry mixing ball mill to carry out dry ground, obtain white carbon black.
Described raw silicon colloidal sol can adopt the silicon sol of following three kinds of different pH values, and its partition is calculated by weight percentage:
1. silicon sol pH is 9～11, proportion is 1.14～1.30g/cm
3, SiO
2Content is 20%～40%, Na
2O content is 0.40%, water-content is 59.6%～79.6%, SiO
2The particle diameter of colloidal solid is between 8～35nm.
2. silicon sol pH is 6.5～8.5, proportion is 1.14～1.30g/cm
3, SiO
2Content is 20～40%, and water-content is 59.96～79.96%, Na
2O content is 0.04%, SiO
2The particle diameter of colloidal solid is between 8～35nm.
3. silicon sol pH is 2～3, proportion is 1.14～1.2g/cm
3, SiO
2Content is 20～30%, water-content is 69.96～79.96%, Na
2O content is 0.04%, SiO
2The particle diameter of colloidal solid is between 8～35nm.
Compared with prior art, the present invention has following unusual effect:
(1) prepare white carbon black with method of the present invention, its technology is simple, with low cost.Present method adopts, and the freezing technology of thawing again of elder generation simple, original creation is separated nanometer silicon dioxide particle from silicon sol, only need in Nano particles of silicon dioxide that simple freezing, course of defrosting just can make dispersion suspension in the silicon sol and the silicon sol water fully, separate up hill and dale, just can obtain white carbon black through simple milled processed after the separation.And existing be the method that the chemical method of raw material prepares white carbon black with the water glass, the disclosed a kind of white carbon black preparation method of patent of invention " preparation method of the white carbon black of a kind of reinforcement " (the Chinese patent publication number is CN101332994A) for example, it uses water glass as raw material, preparation process comprises and adds sulfuric acid reaction, aging, heated and stirred, adjusting pH value, reacting by heating is filtered once more, making beating, drying and other steps obtains white carbon black, and technology is very complicated.The Chinese patent notification number is CN1424362A, in the disclosed method for preparing nano white carbon black with silicon sol, also has complicated technological process, comprise processes such as adding organic solvent, adjusting pH value, exchange of solvent, raw material consumption is many, difficult solvent recovery, the Processes and apparatus complexity, cost is higher.And the present invention only needs the simple freezing physical process of thawing again earlier just nano silicon can be separated, and the intermediate steps of white carbon black preparation is significantly reduced, thereby reduced cost widely, has stablized the performance of white carbon black.
(2) can control by the purity of raw silicon colloidal sol fully with the purity of the white carbon black of the inventive method preparation.That is to say can use that purity is lower, the silicon sol that contains more sodium ions content is as raw material, by pure water washing by soaking hydration SiO repeatedly
2The method of transparent sheet-like granular deposit reduce impurity natrium ionic content in the white carbon black, reach the specification of quality of white carbon black.
Embodiment:
By following embodiment the present invention is further elaborated.
Embodiment 1: select for use commercially available alkaline silica sol to prepare white carbon black as raw material, the physical and chemical parameter of its silicon sol is: the pH value is 10.5, and proportion is 1.3g/cm
3, SiO
2Content is 40%, Na
2O content is 0.40%, and water-content is 59.6%, SiO
2The particle diameter of colloidal solid between 8～35nm, even particle size distribution, the saturating pale blue light of the transparent clarification of color.This silicon sol is contained in the container, and it is freezing up to the complete glaciation shape of silicon sol solid to put into refrigeration chamber.Then, these scars being shifted out refrigeration chamber together with container thaws.Carrying out with course of defrosting, can observe container bottom and deposit increasing transparent sheet-like solid particulate gradually, thaw finish after, silicon dioxide colloid particle in the silicon sol all is deposited on container bottom with the form of transparent sheet-like solid particulate, and not having adhesion between this chip solid particle, drainability is good.Separate by transparent sheet-like solid particulate and the water that filters silicon-dioxide.The transparent sheet-like solid particulate is soaked with pure water, filter then, repeat again to soak, filter, repeat like this 4 times, the content of sodium ion can drop to below 0.04% in the silicon-dioxide chip solid particle that obtains.The silicon-dioxide chip solid particle that obtains is used dry method ball mill ball milling 5 hours after 90-105 ℃ of drying, obtain white carbon black of the present invention.
Embodiment 2: the water that the transparent chip solid particle of the silicon-dioxide that obtains by embodiment 1 adds equal quality mixes, and grinds 5 hours with ball mill by wet process, obtains uniform water dispersion slurry, carries out spraying drying then, obtains white carbon black.
Embodiment 3: selecting neutral silicon sol for use is the white carbon black of feedstock production, and its silicon sol physical and chemical parameter is: pH is 7, and proportion is 1.14g/cm
3, SiO
2Content is 20%, Na
2O content is 0.04%, and water-content is 79.96%, SiO
2The particle diameter of colloidal solid between 5-40nm, even particle size distribution, the saturating pale blue light of the transparent clarification of color.This silicon sol is contained in the container, and it is freezing up to the complete glaciation shape of silicon sol solid to put into refrigeration chamber.Then, these scars being shifted out refrigeration chamber together with container thaws.Carrying out with course of defrosting, can observe container bottom and deposit increasing transparent sheet-like solid particulate gradually, thaw finish after, silica dioxide granule in the silicon sol all is deposited on container bottom with the form of transparent sheet-like solid particulate, and not having adhesion between this chip solid particle, drainability is good.Filtration separates the transparent sheet-like solid particulate and the water of silicon-dioxide.After the 90-105 ℃ of drying of hydrated SiO 2 chip solid particle process that obtains, pulverized 5 hours, obtain white carbon black with the dry mixing ball milling utmost point.
Embodiment 4: hydrated SiO 2 transparent sheet-like solid particulate that obtains by embodiment 3 and water mix by 1: 5 mass ratio, with ball mill grinding 5 hours, obtain uniform water dispersion slurry, carry out spraying drying then, obtain white carbon black.
Embodiment 5: selecting acidic silicasol is the white carbon black of feedstock production, and its silicon sol physical and chemical parameter is: the pH value is 2.2, and proportion is 1.2g/cm
3, SiO
2Content is 30%, Na
2O content is 0.1%, and water-content is 69.90%, SiO
2The particle diameter of colloidal solid between 8～35nm, even particle size distribution, the saturating pale blue light of the transparent clarification of color.This silicon sol is contained in the container, and it is freezing up to the complete glaciation shape of silicon sol solid to put into refrigeration chamber.Then, these scars being shifted out refrigeration chamber together with container thaws.Carrying out with course of defrosting, can observe container bottom and deposit increasing transparent sheet-like solid particulate gradually, thaw finish after, the silica dioxide granule overwhelming majority in the silicon sol is deposited on container bottom with the form of transparent sheet-like solid particulate, and not having adhesion between this chip solid particle, drainability is good.Filtration separates the transparent sheet-like solid particulate and the water of silicon-dioxide.The transparent sheet-like solid particulate is soaked with pure water, filter then, repeat again to soak, filter, repeat like this 6 times, the content of sodium ion can drop to below 0.04% in the silicon-dioxide chip solid particle that obtains.After the 90-105 ℃ of drying of hydrated SiO 2 chip solid particle process that obtains, use dry method ball mill ball milling 5 hours, obtain white carbon black.
Embodiment 6: transparent chip solid particle of silicon-dioxide that obtains by embodiment 5 and water mix by 5: 1 mass ratio, with agitating ball mill ball milling 5 hours, obtain even water dispersion slurry, carry out spraying drying then, obtain white carbon black.
Claims (7)
1. the preparation method of a white carbon black, it is characterized in that: this preparation method's step is:
(1) choose raw silicon colloidal sol, its prescription is calculated by weight percentage:
Choose pH and be 2.0～12, proportion is 1.14～1.3g/cm
3, SiO
2Content is 20%～40%, water content is 59.6%～79.96%, Na
2O content is 0.04%～0.40%, SiO
2The silicon sol of the particle diameter of colloidal solid between 5～40nm is raw material;
(2) by first freezing method of thawing again with SiO
2From silicon sol, separate:
With the described silicon sol container of packing into, it is icing fully to integral body to be placed on the refrigeration chamber internal cooling, and the container that will fill the silicon sol that freezes then shifts out refrigeration chamber and thaws, after treating to thaw fully, and hydration SiO
2Promptly and water sepn, be deposited on container bottom, through filtering the transparent sheet-like granular deposit separated then with transparent sheet-like particulate form;
(3) by dry method or the levigate hydration SiO of wet method
2The transparent sheet-like granular deposit obtain white carbon black.
2. according to the preparation method of the described white carbon black of claim 1, it is characterized in that:
Described silicon sol pH is 9～11, proportion is 1.14～1.30g/cm
3, SiO
2Content is 20%～40%, Na
2O content is 0.40%, water-content is 59.6%～79.6%, SiO
2The particle diameter of colloidal solid is between 8～35nm, and its partition is calculated by weight percentage.
3. according to the preparation method of the described white carbon black of claim 1, it is characterized in that:
Described silicon sol pH is 6.5～8.5, proportion is 1.14～1.30g/cm
3, SiO
2Content is 20～40%, and water-content is 59.96～79.96%, Na
2O content is 0.04%, SiO
2The particle diameter of colloidal solid is between 8～35nm, and its partition is calculated by weight percentage.
4. according to the preparation method of the described white carbon black of claim 1, it is characterized in that:
Described silicon sol pH is 2～3, proportion is 1.14～1.2g/cm
3, SiO
2Content is 20～30%, water-content is 69.96～79.96%, Na
2O content is 0.04%, SiO
2The particle diameter of colloidal solid is between 8～35nm, and its partition is calculated by weight percentage.
5. according to the preparation method of the described white carbon black of claim 1, it is characterized in that:
With the freezing hydration SiO that thaws again and obtain of elder generation
2The transparent sheet-like granular deposit with pure water repeatedly soak, filtration treatment, the content of sodium ion in white carbon black is reduced to below 0.04%.
6. according to the preparation method of the described white carbon black of claim 1, it is characterized in that:
With the hydration SiO that obtains
2Transparent sheet-like granular deposit and water mix by 1: 5～5: 1 mass ratio, grind to form the water dispersion slurry with ball mill or agitating ball mill, then this slurry is carried out spraying drying, obtain white carbon black.
7. according to the preparation method of the described white carbon black of claim 1, it is characterized in that:
With the hydration SiO that obtains
2The transparent sheet-like granular deposit through after 90-105 ℃ of drying, carry out dry ground with dry method ball mill or dry mixing ball mill, obtain white carbon black.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101064892A CN101792148B (en) | 2010-01-29 | 2010-01-29 | Method for preparing white carbon black |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101064892A CN101792148B (en) | 2010-01-29 | 2010-01-29 | Method for preparing white carbon black |
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| CN101792148B true CN101792148B (en) | 2011-11-30 |
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| CN104311159B (en) * | 2014-09-23 | 2016-08-24 | 佛山市禾才科技服务有限公司 | A kind of glass-ceramic clad plate production technology |
| CN113861482B (en) * | 2021-10-13 | 2023-04-25 | 南京工程学院 | PDMS-based coated sheet SiO 2 Process for preparing a film of a electrochromic material |
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