BR9810408A - Silica hydrophobic gels with reduced surface area - Google Patents
Silica hydrophobic gels with reduced surface areaInfo
- Publication number
- BR9810408A BR9810408A BR9810408-0A BR9810408A BR9810408A BR 9810408 A BR9810408 A BR 9810408A BR 9810408 A BR9810408 A BR 9810408A BR 9810408 A BR9810408 A BR 9810408A
- Authority
- BR
- Brazil
- Prior art keywords
- silica
- hydrophobic
- surface area
- reduced surface
- gel
- Prior art date
Links
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 title abstract 19
- 230000002209 hydrophobic effect Effects 0.000 title abstract 8
- 239000000377 silicon dioxide Substances 0.000 title abstract 8
- 239000000499 gel Substances 0.000 title abstract 5
- 239000000017 hydrogel Substances 0.000 abstract 4
- 239000002253 acid Substances 0.000 abstract 2
- 239000008119 colloidal silica Substances 0.000 abstract 2
- 239000000203 mixture Substances 0.000 abstract 2
- 230000003197 catalytic effect Effects 0.000 abstract 1
- 229910052500 inorganic mineral Inorganic materials 0.000 abstract 1
- 239000011707 mineral Substances 0.000 abstract 1
- 239000003960 organic solvent Substances 0.000 abstract 1
- 150000003961 organosilicon compounds Chemical class 0.000 abstract 1
- 239000000741 silica gel Substances 0.000 abstract 1
- 229910002027 silica gel Inorganic materials 0.000 abstract 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B33/00—Silicon; Compounds thereof
- C01B33/113—Silicon oxides; Hydrates thereof
- C01B33/12—Silica; Hydrates thereof, e.g. lepidoic silicic acid
- C01B33/16—Preparation of silica xerogels
-
- 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
- C09C1/28—Compounds of silicon
- C09C1/30—Silicic acid
- C09C1/3081—Treatment with organo-silicon compounds
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/60—Particles characterised by their size
-
- 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
- C01P2006/12—Surface area
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Dispersion Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Silicon Compounds (AREA)
- Pigments, Carbon Blacks, Or Wood Stains (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
Patente de Invenção:<B>SìLICA GéIS HIDROFóBICAS COM áREA DE SUPERFìCIE REDUZIDA"<D>. A presente invenção é sílica géis hidrofóbicas, tendo área de superfície reduzida e um método para a sua preparação. O método compreende três etapas, onde na primeira etapa uma mistura compreendendo um hidrossol de sílica e uma sílica coloidal é formada. Na segunda etapa, a mistura é tratada por calor, na presença de um ácido mineral forte, em um pH menor do que cerca de 1, para formar um hidrogel de sílica tendo, incorporado no mesmo, a sílica coloidal. Na terceira etapa, o hidrogel de sílica é contatado com um composto de organossilício, na presença de uma quantidade catalítica de um ácido forte, para tornar hidrofóbico o hidrogel de sílica, desse modo formando uma sílica gel hidrofóbica tendo uma área de superfície dentro de uma faixa de cerca de 100 m^ 2^/g a 450 m^ 2^/g, conforme medida no estado seco. Em um método preferido, a sílica gel hidrofóbica é contatada com uma quantidade suficiente de um solvente orgânico imiscível com a água, para converter o hidrogel de sílica hidrofóbico em um organosílica gel hidrofóbica.Invention Patent: <B> SILICALLY HYDROPHOBIC GELS WITH REDUCED SURFACE AREA "<D>. The present invention is hydrophobic silica gels, having reduced surface area and a method for their preparation. The method comprises three steps, where in the first step a mixture comprising a silica hydrosol and a colloidal silica is formed. In the second step, the mixture is heat treated, in the presence of a strong mineral acid, at a pH less than about 1, to form a silica hydrogel having colloidal silica incorporated in it. In the third stage, the silica hydrogel is contacted with an organosilicon compound, in the presence of a catalytic amount of a strong acid, to make the silica hydrogel hydrophobic, thereby forming a silica hydrophobic gel having a surface area within a range of about 100 m ^ 2 ^ / g to 450 m ^ 2 ^ / g, as measured in the dry state. In a preferred method, hydrophobic silica gel is c treated with a sufficient amount of a water-immiscible organic solvent to convert the hydrophobic silica hydrogel into a hydrophobic organosilica gel.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US80600597A | 1997-02-24 | 1997-02-24 | |
| PCT/US1998/003273 WO1998037020A1 (en) | 1997-02-24 | 1998-02-18 | Hydrophobic silica gels with reduced surface area |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BR9810408A true BR9810408A (en) | 2000-08-22 |
Family
ID=25193082
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BR9810408-0A BR9810408A (en) | 1997-02-24 | 1998-02-18 | Silica hydrophobic gels with reduced surface area |
Country Status (8)
| Country | Link |
|---|---|
| EP (1) | EP0963345A1 (en) |
| JP (1) | JP2001513066A (en) |
| KR (1) | KR20000075594A (en) |
| CN (1) | CN1248226A (en) |
| AU (1) | AU6660598A (en) |
| BR (1) | BR9810408A (en) |
| CA (1) | CA2280795A1 (en) |
| WO (1) | WO1998037020A1 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6342560B1 (en) * | 1999-08-19 | 2002-01-29 | Ppg Industries Ohio, Inc. | Chemically modified fillers and polymeric compositions containing same |
| CN104745145A (en) * | 2013-12-26 | 2015-07-01 | 安集微电子（上海）有限公司 | Preparation method and use of modified silica particles |
| US10377637B2 (en) * | 2014-11-11 | 2019-08-13 | Panasonic Intellectual Property Management Co., Ltd. | Aerogel and manufacturing method thereof |
| CN109019612B (en) * | 2016-05-28 | 2020-05-05 | 天津朗华科技发展有限公司 | Rare earth toughened silicon solid silicon aerogel |
| CN110589839B (en) * | 2019-09-23 | 2021-02-23 | 东莞创利科技发展有限公司 | Silicon dioxide reinforcing agent and preparation method and application thereof |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1092407A (en) * | 1953-10-19 | 1955-04-21 | Du Pont | Surface esterified siliceous solids and their uses |
| GB783868A (en) * | 1954-10-06 | 1957-10-02 | Midland Silicones Ltd | A process of preparing hydrophobic organo-silicon powders |
| US3122520A (en) * | 1959-10-05 | 1964-02-25 | Dow Corning | Method of making silicone rubber fillers |
| SU369131A1 (en) * | 1969-11-12 | 1973-02-08 | ||
| DE2015402A1 (en) * | 1970-04-01 | 1971-10-21 | Bayer | Process for improving the vulcanization behavior and for heat stabilization of polyorganosiloxane elastomers |
| DE3005137A1 (en) * | 1980-02-12 | 1981-08-20 | Degussa Ag, 6000 Frankfurt | CONTAINING PELLETIC SILICONE, METHOD FOR THE PRODUCTION THEREOF, AND ELASTOMERIC LIQUID MEASURES CONTAINING THE CONTAINING PELLETIC SILICONE |
| IT1266660B1 (en) * | 1993-11-04 | 1997-01-09 | Eniricerche Spa | PROCEDURE FOR THE PREPARATION OF POROUS SILICA XEROGELS IN SPHERICAL FORM |
| US5708069A (en) * | 1997-02-24 | 1998-01-13 | Dow Corning Corporation | Method for making hydrophobic silica gels under neutral conditions |
-
1998
- 1998-02-18 BR BR9810408-0A patent/BR9810408A/en not_active Application Discontinuation
- 1998-02-18 WO PCT/US1998/003273 patent/WO1998037020A1/en not_active Ceased
- 1998-02-18 EP EP98908610A patent/EP0963345A1/en not_active Withdrawn
- 1998-02-18 JP JP53688398A patent/JP2001513066A/en active Pending
- 1998-02-18 CN CN98802755A patent/CN1248226A/en active Pending
- 1998-02-18 AU AU66605/98A patent/AU6660598A/en not_active Abandoned
- 1998-02-18 CA CA002280795A patent/CA2280795A1/en not_active Abandoned
- 1998-02-18 KR KR1019997007655A patent/KR20000075594A/en not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| KR20000075594A (en) | 2000-12-26 |
| AU6660598A (en) | 1998-09-09 |
| JP2001513066A (en) | 2001-08-28 |
| WO1998037020A1 (en) | 1998-08-27 |
| CN1248226A (en) | 2000-03-22 |
| EP0963345A1 (en) | 1999-12-15 |
| CA2280795A1 (en) | 1998-08-27 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FA10 | Dismissal: dismissal - article 33 of industrial property law | ||
| B11Y | Definitive dismissal acc. article 33 of ipl - extension of time limit for request of examination expired |