CN100364892C - Process for preparing superfine dolomite - Google Patents
Process for preparing superfine dolomite Download PDFInfo
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- CN100364892C CN100364892C CNB2006100283580A CN200610028358A CN100364892C CN 100364892 C CN100364892 C CN 100364892C CN B2006100283580 A CNB2006100283580 A CN B2006100283580A CN 200610028358 A CN200610028358 A CN 200610028358A CN 100364892 C CN100364892 C CN 100364892C
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- acid
- dolomite
- grinding aid
- rhombspar
- slurry
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- 239000010459 dolomite Substances 0.000 title claims abstract description 24
- 229910000514 dolomite Inorganic materials 0.000 title claims abstract description 24
- 238000004519 manufacturing process Methods 0.000 title description 2
- 238000000227 grinding Methods 0.000 claims abstract description 25
- 239000002002 slurry Substances 0.000 claims abstract description 23
- 238000000034 method Methods 0.000 claims abstract description 12
- 238000002360 preparation method Methods 0.000 claims abstract description 11
- 239000002253 acid Substances 0.000 claims abstract description 10
- 238000005886 esterification reaction Methods 0.000 claims abstract description 9
- 239000000843 powder Substances 0.000 claims abstract description 7
- 239000007795 chemical reaction product Substances 0.000 claims abstract description 3
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 claims description 33
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 22
- VZCYOOQTPOCHFL-OWOJBTEDSA-N Fumaric acid Chemical compound OC(=O)\C=C\C(O)=O VZCYOOQTPOCHFL-OWOJBTEDSA-N 0.000 claims description 16
- RFVNOJDQRGSOEL-UHFFFAOYSA-N 2-hydroxyethyl octadecanoate Chemical compound CCCCCCCCCCCCCCCCCC(=O)OCCO RFVNOJDQRGSOEL-UHFFFAOYSA-N 0.000 claims description 14
- 229950007687 macrogol ester Drugs 0.000 claims description 14
- 229920003171 Poly (ethylene oxide) Polymers 0.000 claims description 11
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 claims description 11
- 235000006408 oxalic acid Nutrition 0.000 claims description 11
- -1 polyoxyethylene Polymers 0.000 claims description 11
- 238000003756 stirring Methods 0.000 claims description 10
- 150000007520 diprotic acids Chemical class 0.000 claims description 9
- 239000001530 fumaric acid Substances 0.000 claims description 8
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 claims description 8
- 230000032050 esterification Effects 0.000 claims description 6
- 238000000576 coating method Methods 0.000 abstract description 26
- 239000011248 coating agent Substances 0.000 abstract description 25
- 238000009472 formulation Methods 0.000 abstract description 15
- 239000000203 mixture Substances 0.000 abstract description 15
- 239000000049 pigment Substances 0.000 abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 7
- 239000003795 chemical substances by application Substances 0.000 abstract description 6
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 abstract 1
- 239000002202 Polyethylene glycol Substances 0.000 abstract 1
- 229920001223 polyethylene glycol Polymers 0.000 abstract 1
- 239000000047 product Substances 0.000 abstract 1
- 238000010521 absorption reaction Methods 0.000 description 10
- 239000000976 ink Substances 0.000 description 10
- 241000276489 Merlangius merlangus Species 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 239000003292 glue Substances 0.000 description 4
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 4
- 239000004816 latex Substances 0.000 description 4
- 229920000126 latex Polymers 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000000123 paper Substances 0.000 description 4
- 239000004033 plastic Substances 0.000 description 4
- 230000002087 whitening effect Effects 0.000 description 4
- 239000013078 crystal Substances 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 235000019832 sodium triphosphate Nutrition 0.000 description 2
- 229910021532 Calcite Inorganic materials 0.000 description 1
- 101710194948 Protein phosphatase PhpP Proteins 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- HHSPVTKDOHQBKF-UHFFFAOYSA-J calcium;magnesium;dicarbonate Chemical compound [Mg+2].[Ca+2].[O-]C([O-])=O.[O-]C([O-])=O HHSPVTKDOHQBKF-UHFFFAOYSA-J 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 1
- HWGNBUXHKFFFIH-UHFFFAOYSA-I pentasodium;[oxido(phosphonatooxy)phosphoryl] phosphate Chemical compound [Na+].[Na+].[Na+].[Na+].[Na+].[O-]P([O-])(=O)OP([O-])(=O)OP([O-])([O-])=O HWGNBUXHKFFFIH-UHFFFAOYSA-I 0.000 description 1
- 229920001495 poly(sodium acrylate) polymer Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 235000019982 sodium hexametaphosphate Nutrition 0.000 description 1
- GCLGEJMYGQKIIW-UHFFFAOYSA-H sodium hexametaphosphate Chemical compound [Na]OP1(=O)OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])O1 GCLGEJMYGQKIIW-UHFFFAOYSA-H 0.000 description 1
- 239000001488 sodium phosphate Substances 0.000 description 1
- 229910000162 sodium phosphate Inorganic materials 0.000 description 1
- NNMHYFLPFNGQFZ-UHFFFAOYSA-M sodium polyacrylate Chemical compound [Na+].[O-]C(=O)C=C NNMHYFLPFNGQFZ-UHFFFAOYSA-M 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000001577 tetrasodium phosphonato phosphate Substances 0.000 description 1
- UNXRWKVEANCORM-UHFFFAOYSA-I triphosphate(5-) Chemical compound [O-]P([O-])(=O)OP([O-])(=O)OP([O-])([O-])=O UNXRWKVEANCORM-UHFFFAOYSA-I 0.000 description 1
- RYFMWSXOAZQYPI-UHFFFAOYSA-K trisodium phosphate Chemical compound [Na+].[Na+].[Na+].[O-]P([O-])([O-])=O RYFMWSXOAZQYPI-UHFFFAOYSA-K 0.000 description 1
Landscapes
- Inks, Pencil-Leads, Or Crayons (AREA)
- Paper (AREA)
Abstract
The present invention discloses a preparation method of superfine dolomite, which comprises the following steps: adding 300 to 350 meshes of dolomite powder and a grinding aid agent to water to prepare 45 to 75 wt% of superfine dolomite slurry; adopting a grinding device for the extra-fine grinding of dolomite to prepare superfine dolomite slurry, wherein the grinding aid agent is the esterification reaction product of dibasic acid and polyethylene glycol. The superfine dolomite prepared with the method of the present invention can be used as the pigment of paper coatings. The coating experiment by adopting superfine dolomite to replace 10 to 50% of ground limestone can prove that the indices, such as printing ink absorbability, brightness, printing brightness, wet repellence, etc. of finished paper products are much more increased than the original formulation.
Description
Technical field
The present invention relates to preparation method of super-fine dolomite.
Background technology
DOLOMITE CRYSTALS is rhombohedron, and is similar to the calcite crystal formation.Rhombspar has advantages such as impurity is few, whiteness is high, reserves are big, distribution is wide.At present rhombspar is mainly used in the raw material of introducing MgO in refractory materials, flux, the glass industry, preparation Magnesium Carbonate Light 41-45 etc.
The rhombspar of domestic production at present is generally tens to the hundreds of order, the thinnest 1000 orders that are no more than, thereby the application of rhombspar also is restricted.
The CN02136447.8 patent disclosure a kind of preparation method of super-fine dolomite, it is grinding aid that this patent adopts sodium polyacrylate or sodium phosphate, tripoly phosphate sodium STPP, Sodium hexametaphosphate 99, therefore, the disclosed technology of this patent exists an obvious defects.The super fine bitter spar that it makes, median size are 1-2.5 μ m, and size range is wide, skewness, the slurry viscosity height of making, poor stability.
Summary of the invention:
The technical issues that need to address of the present invention are to disclose a kind of preparation method of super-fine dolomite, to overcome the above-mentioned defective that prior art exists.
Preparing method of super-fine dolomite of the present invention comprises the steps:
300～350 purpose ground dolomites and grinding aid are added in the entry, be made into weight content and be 45～75% super fine bitter spar slurry, adopt grinding plant that rhombspar is carried out ultra-fine mill then, make the super fine bitter spar slurry, wherein grain diameter is 60～100% less than the content of 2 μ m, and median size is 0.6～1.8 μ m.
The add-on of grinding aid is with respect to 0.1～5.0% of the weight of rhombspar dry powder.
Said grinding aid is the esterification reaction product of diprotic acid and polyoxyethylene glycol, and described diprotic acid is selected from one or more in oxalic acid, fumaric acid or the hexanodioic acid, and its molecular weight of described polyoxyethylene glycol can be 200-20000.
Grinding aid is to adopt following method to be prepared:
Diprotic acid and the polyoxyethylene glycol mole by 1: 1～1: 1.2 is mixed, be heated to 180～250 ℃ of esterifications then 3～5 hours, generate grinding aid diprotic acid list macrogol ester;
The molecular structure of grinding aid of the present invention is a long-chain, and an end of long-chain is a carboxyl, and it can be combined closely by chemical bond and dolomite particles surface; And the rest part of long chain molecule is a hydrophilic-structure, with water molecules good consistency is arranged, thereby the small-particle after the grinding is dispersed in the water well, has stoped intergranular reunion once more, guarantees that the super fine bitter spar size range that makes is narrow, is evenly distributed.
Described grinding plant is separate unit or many placed in-line machine or the stirring mills of delaminating.
The prepared super fine bitter spar of the present invention is used for paper making and cloth coating pigment.Replace the 10%--50% water-ground limestone with super fine bitter spar, do the coating experiment, the ink absorption of finished paper, glossiness, print gloss, indexs such as wet repulsion improve a lot than original formulation.
The prepared super fine bitter spar of the present invention can be used for paper making and cloth coating pigment, replace the 10%--50% water-ground limestone with super fine bitter spar, do the coating experiment, the ink absorption of finished paper, glossiness, print gloss, indexs such as wet repulsion improve a lot than original formulation.
Embodiment
Embodiment 1
With 9 kilograms of oxalic acid and 80 kilogram molecular weights is that 800 polyoxyethylene glycol is put into reactor, is heated to 200 ℃ then and carries out esterification, and when the water yield that generates reached 1.8 kilograms, reaction finished, and obtains about 87 kilograms of oxalic acid list macrogol ester.
With 325 order ground dolomite slurrying, ground dolomite is added in the entry, and Xiang Shuizhong adds above-mentioned oxalic acid list macrogol ester, wherein adding oxalic acid list macrogol ester is 0.3% with respect to the weight of rhombspar dry powder, stirs to make the grinding aid dissolving, is made into weight content and is 65% rhombspar slurry, fully stir, make slurry obtain good flowability, adopt the ultra-fine machine of delaminating of wet type of 80 liters of two series connection then, rhombspar is carried out ultra-fine mill.Make the super fine bitter spar slurry, wherein grain diameter is 90% less than the content of 2 μ m, and median size is 1.0 μ m.Adopt the method for ISO 2884-2-2003 standard code, recording slurry viscosity with NDJ-1 type rotational viscosimeter is 210 centipoises.
Super fine bitter spar with preparation replaces 50% water-ground limestone, does the coating experiment, and formulation for coating material sees Table 1.
Table 1
| Coarse whiting | Rhombspar | China clay | Calcined earth | Whitening agent | CMC | Latex | Plastic pigment | |
| Original formulation % | 36.81 | 0.00 | 48.88 | 11.28 | 0.45 | 0.60 | 14.29 | 3.00 |
| Substitute prescription % | 18.41 | 18.41 | 48.88 | 11.28 | 0.45 | 0.60 | 14.29 | 3.00 |
After coating prepared, be coated with, be coated on the blank cardboard and carry out, be coated with twice continuously with this coating, i.e. primary coat and in be coated with, glue spread is 18g/m
2Behind the letterweight light after the coating, adopt the GB/T1033-1995 standard to detect, detected result sees Table 2.
Table 2
| Ink absorption % | Glossiness % | Absorption of inks speed | Print gloss % | Wet plucking % | The wet % that repels | |
| Original formulation | 20.4 | 55.3 | 1.31 | 94 | -0.9 | 21.1 |
| Substitute prescription | 23.3 | 59.6 | 1.07 | 97 | -1.2 | 26.7 |
Embodiment 2
With 11.6 kilograms of fumaric acid and 20 kilogram molecular weights is that 200 polyoxyethylene glycol is put into reactor, is heated to 190 ℃ then and carries out esterification, and when the water yield that generates reached 1.8 kilograms, reaction finished, and obtains about 28 kilograms of fumaric acid list macrogol ester.
With 325 order ground dolomite slurrying, ground dolomite is added in the entry, and Xiang Shuizhong adds fumaric acid list macrogol ester, wherein adding fumaric acid list macrogol ester is 1.5% with respect to the weight of rhombspar dry powder, stirs to make the grinding aid dissolving, is made into weight content and is 75% rhombspar slurry, fully stir, make slurry obtain good flowability, adopt 300 liters the ultra-fine machine of delaminating of wet type then, rhombspar is carried out ultra-fine mill.Make the super fine bitter spar slurry, wherein less than 2 μ m content 98%, median size is 0.6 μ m.Adopt the method for ISO 2884-2-2003 standard code, recording slurry viscosity with NDJ-1 type rotational viscosimeter is 240 centipoises.
Super fine bitter spar with preparation replaces 40% water-ground limestone, does the coating experiment, and formulation for coating material sees Table 3.
Table 3
| Coarse whiting | Rhombspar | China clay | Calcined earth | Whitening agent | CMC | Latex | Plastic pigment | |
| Original formulation % | 36.81 | 0.00 | 48.88 | 11.28 | 0.45 | 0.60 | 14.29 | 3.00 |
| Substitute prescription % | 22.09 | 14.72 | 48.88 | 11.28 | 0.45 | 0.60 | 14.29 | 3.00 |
After coating prepared, be coated with, be coated on the blank cardboard and carry out, be coated with twice continuously with this coating, i.e. primary coat and in be coated with, glue spread is 18g/m
2Adopt the GB/T1033-1995 standard to detect behind the letterweight light after the coating, detected result sees Table 4.
Table 4
| Ink absorption % | Glossiness % | Absorption of inks speed | Print gloss % | Wet plucking % | The wet % that repels | |
| Original formulation | 20.4 | 55.3 | 1.31 | 94 | -0.9 | 21.1 |
| Substitute prescription | 24.3 | 61.3 | 1.01 | 97 | -1.5 | 27.3 |
Embodiment 3
With 1.46 kilograms of hexanodioic acids and 100 kilogram molecular weights is that 10000 polyoxyethylene glycol is put into reactor, is heated to 250 ℃ then and carries out esterification, and when the water yield that generates reached 0.2 kilogram, reaction finished, and obtains about 101 kilograms of hexanodioic acid list macrogol ester.
With 325 order ground dolomite slurrying, ground dolomite is added in the entry, and Xiang Shuizhong adds hexanodioic acid list macrogol ester, wherein adding hexanodioic acid list macrogol ester is 2.0% with respect to the weight of rhombspar dry powder, stirs to make the grinding aid dissolving, is made into weight content and is 60% rhombspar slurry, fully stir, make slurry obtain good flowability, adopt 3000 liters the ultra-fine machine of delaminating of wet type then, rhombspar was carried out ultra-fine mill 24 hours.Make the super fine bitter spar slurry, wherein less than 2 μ m content 95%, median size is 0.8 μ m.Adopt the method for ISO 2884-2-2003 standard code, recording slurry viscosity with NDJ-1 type rotational viscosimeter is 190 centipoises.
Super fine bitter spar with preparation replaces 30% water-ground limestone, does the coating experiment, and formulation for coating material sees Table 5.
Table 5
| Coarse whiting | Rhombspar | China clay | Calcined earth | Whitening agent | CMC | Latex | Plastic pigment | |
| Original formulation % | 36.81 | 0.00 | 48.88 | 11.28 | 0.45 | 0.60 | 14.29 | 3.00 |
| Substitute prescription % | 25.77 | 11.04 | 48.88 | 11.28 | 0.45 | 0.60 | 14.29 | 3.00 |
After coating prepared, be coated with, be coated on the blank cardboard and carry out, be coated with twice continuously with this coating, i.e. primary coat and in be coated with, glue spread is 18g/m
2Adopt the GB/T1033-1995 standard to detect behind the letterweight light after the coating, detected result sees Table 6.
Table 6
| Ink absorption % | Glossiness % | Absorption of inks speed | Print gloss % | Wet plucking % | The wet % that repels | |
| Original formulation | 20.4 | 55.3 | 1.31 | 94 | -0.9 | 21.1 |
| Substitute prescription | 23.9 | 59.8 | 1.16 | 96 | -1.1 | 28.0 |
Embodiment 4
With 9 kilograms of oxalic acid, 11.6 kilograms of fumaric acid and 80 kilogram molecular weights is that 400 polyoxyethylene glycol is put into reactor, be heated to 210 ℃ then and carry out esterification, when the water yield that generates reached 3.6 kilograms, reaction finished, and obtained about 97 kilograms of the sour single macrogol ester of oxalic acid richness/horse.
With 325 order ground dolomite slurrying, ground dolomite is added in the entry, and Xiang Shuizhong adds oxalic acid richness/single macrogol ester of horse acid, wherein adding the single macrogol ester of oxalic acid richness/horse acid is 1.3% with respect to the weight of rhombspar dry powder, stirs and makes the grinding aid dissolving, is made into weight content and is 70% rhombspar slurry, fully stir, make slurry obtain good flowability, adopt the ultra-fine machine of delaminating of wet type of 80 liters of three series connection then, rhombspar is carried out ultra-fine mill.Make the super fine bitter spar slurry, wherein less than 2 μ m content 96%, median size is 0.9 μ m.Adopt the method for ISO 2884-2-2003 standard code, recording slurry viscosity with NDJ-1 type rotational viscosimeter is 200 centipoises.
Super fine bitter spar with preparation replaces 50% water-ground limestone, does the coating experiment, and formulation for coating material sees Table 7.
Table 7
| Coarse whiting | Rhombspar | China clay | Calcined earth | Whitening agent | CMC | Latex | Plastic pigment | |
| Original formulation % | 36.81 | 0.00 | 48.88 | 11.28 | 0.45 | 0.60 | 14.29 | 3.00 |
| Substitute prescription % | 18.41 | 18.41 | 48.88 | 11.28 | 0.45 | 0.60 | 14.29 | 3.00 |
After coating prepared, be coated with, be coated on the blank cardboard and carry out, be coated with twice continuously with this coating, i.e. primary coat and in be coated with, glue spread is 18g/m
2Adopt the GB/T1033-1995 standard to detect behind the letterweight light after the coating, detected result sees Table 8.
Table 8
| Ink absorption % | Glossiness % | Absorption of inks speed | Print gloss % | Wet plucking % | The wet % that repels | |
| Original formulation | 20.4 | 55.3 | 1.31 | 94 | -0.9 | 21.1 |
| Substitute prescription | 24.5 | 60.3 | 1.21 | 97 | -1.7 | 28.1 |
Claims (5)
1. a preparation method of super-fine dolomite is characterized in that, comprises the steps:
300～350 purpose ground dolomites and grinding aid are added in the entry, be made into weight content and be 45～75% rhombspar slurry, adopt grinding plant that rhombspar is carried out ultra-fine mill then, make the super fine bitter spar slurry;
Said grinding aid is the esterification reaction product of diprotic acid and polyoxyethylene glycol;
Described diprotic acid is selected from one or more in oxalic acid, fumaric acid or the hexanodioic acid.
2. method according to claim 1 is characterized in that, its molecular weight of described polyoxyethylene glycol is 200-20000.
3. method according to claim 1 is characterized in that, the add-on of grinding aid is with respect to 0.1～5.0% of the weight of rhombspar dry powder.
4. method according to claim 1 is characterized in that, grinding aid is to adopt following method to be prepared:
With diprotic acid and polyoxyethylene glycol mixed in molar ratio by 1: 1～1: 1.2, be heated to 180～250 ℃ of esterifications then 3～5 hours, generate grinding aid diprotic acid list macrogol ester;
Described diprotic acid is selected from one or more in oxalic acid, fumaric acid or the hexanodioic acid;
Described polyoxyethylene glycol its minute suboutput is 200-20000.
5. method according to claim 1 is characterized in that, described grinding plant is separate unit or many placed in-line machine or the stirring mills of delaminating.
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|---|---|---|---|
| CNB2006100283580A CN100364892C (en) | 2006-06-29 | 2006-06-29 | Process for preparing superfine dolomite |
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|---|---|---|---|
| CNB2006100283580A CN100364892C (en) | 2006-06-29 | 2006-06-29 | Process for preparing superfine dolomite |
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| CN100364892C true CN100364892C (en) | 2008-01-30 |
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| WO2010008092A1 (en) * | 2008-07-18 | 2010-01-21 | 花王株式会社 | Method for producing hydraulic powder |
| CN107512741B (en) * | 2017-09-04 | 2019-04-16 | 中国科学院地球化学研究所 | A method of preparing ankerite at high temperature under high pressure |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1473783A (en) * | 2002-08-09 | 2004-02-11 | 上海东升新材料有限公司 | Process for preparing super fine bitter spar and use of super fine bitter spar |
| US20040198584A1 (en) * | 2003-04-02 | 2004-10-07 | Saint-Gobain Ceramics & Plastic, Inc. | Nanoporous ultrafine alpha-alumina powders and freeze drying process of preparing same |
| CN1654585A (en) * | 2005-01-17 | 2005-08-17 | 上海大学 | Core/shell nano particle grinding agent polishing solution composition and method for preparing same |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1473783A (en) * | 2002-08-09 | 2004-02-11 | 上海东升新材料有限公司 | Process for preparing super fine bitter spar and use of super fine bitter spar |
| US20040198584A1 (en) * | 2003-04-02 | 2004-10-07 | Saint-Gobain Ceramics & Plastic, Inc. | Nanoporous ultrafine alpha-alumina powders and freeze drying process of preparing same |
| CN1654585A (en) * | 2005-01-17 | 2005-08-17 | 上海大学 | Core/shell nano particle grinding agent polishing solution composition and method for preparing same |
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Denomination of invention: Process for preparing super fine bitter spar and use of super fine bitter spar Effective date of registration: 20191225 Granted publication date: 20080130 Pledgee: Bank of Hangzhou Limited by Share Ltd. Shanghai branch Pledgor: SHANGHAI DONGSHENG NEW MATERIALS Co.,Ltd. Registration number: Y2019310000035 |
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