GB701245A - Process for producing stable silica sols - Google Patents
Process for producing stable silica solsInfo
- Publication number
- GB701245A GB701245A GB2703351A GB2703351A GB701245A GB 701245 A GB701245 A GB 701245A GB 2703351 A GB2703351 A GB 2703351A GB 2703351 A GB2703351 A GB 2703351A GB 701245 A GB701245 A GB 701245A
- Authority
- GB
- United Kingdom
- Prior art keywords
- sol
- active silica
- silica
- sio2
- per cent
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
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
- C01B33/14—Colloidal silica, e.g. dispersions, gels, sols
- C01B33/146—After-treatment of sols
- C01B33/151—After-treatment of sols by progressively adding a sol to a different sol, i.e. "build-up" of particles using a "heel"
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Dispersion Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Silicon Compounds (AREA)
Abstract
An aqueous silica sol is produced by building up the size of particles in a substantially salt-free silica sol of spherical unaggregated dense particles by mixing with the sol a substantially salt-free sol of active silica, while maintaining the pH at 7.5-10.7, and heating the combined sols at above 60 DEG C. in the presence of a base having a monovalent cation M, the molecular ratio of SiO2 to M2O in the product being from 130:1 to 500:1. The freedom from salt is such that the sols have a specific conductance, measured at 2 per cent. SiO2 and 28 DEG C., of not more than 17 x 10-5 mho/cm.; a sol of active silica is defined as a sol in which, at pH 12 and 0.02 per cent. SiO2, at least 90 per cent. depolymerises to the monomer in not more than 100 minutes. Methods of preparing the active silica sol include hydrolysis of methyl silicate, silicon tetrachloride, or silicon sulphide, electro-osmosis or electrolysis of sodium silicate, or treatment of sodium silicate with cation-exchange resins as described in Specification 645,703; anions may be removed by contacting the sol with an anion-exchange material, for example of the metaphenylenediamine-formaldehyde or guanidine type. The sol to which the active silica is added may be prepared by adding a base of a monovalent cation to a sol of active silica to adjust the pH to 6-9 and heating to above 60 DEG C. to form a "heel" sol; the amount of silica added is at least equal to, and preferably 3-15 times, that present in the "heel" sol. The base may be derived from lithium, sodium, potassium, rubidium, caesium, ammonium, tetramethylammonium, trimethylamine, or ethanolamine, and may be added as hydroxide or soluble silicate, either before or during addition of the active silica to the "heel" sol. Preferably the mixture to which the active silica sol is added at its boiling point, and the volume is kept constant by means of evaporation. The sols may be concentrated to an SiO2 content of up to 45 per cent. and are stable against gelation, compatible with water-miscible organic solvents, and may be incorporated with polymeric materials. Specifications 663,013, 667,154, and 699,557 are referred to.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2703351A GB701245A (en) | 1951-11-17 | 1951-11-17 | Process for producing stable silica sols |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2703351A GB701245A (en) | 1951-11-17 | 1951-11-17 | Process for producing stable silica sols |
Publications (1)
Publication Number | Publication Date |
---|---|
GB701245A true GB701245A (en) | 1953-12-23 |
Family
ID=10253070
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2703351A Expired GB701245A (en) | 1951-11-17 | 1951-11-17 | Process for producing stable silica sols |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB701245A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1048890B (en) * | 1954-08-20 | 1959-01-22 | Monsanto Chemicals | Process for the production of acidic silicic acid hydroorganosols with an extremely low salt content |
CN103922349A (en) * | 2014-04-19 | 2014-07-16 | 济南银丰化工有限公司 | Silicasol with high freezing resistance and manufacturing method thereof |
-
1951
- 1951-11-17 GB GB2703351A patent/GB701245A/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1048890B (en) * | 1954-08-20 | 1959-01-22 | Monsanto Chemicals | Process for the production of acidic silicic acid hydroorganosols with an extremely low salt content |
CN103922349A (en) * | 2014-04-19 | 2014-07-16 | 济南银丰化工有限公司 | Silicasol with high freezing resistance and manufacturing method thereof |
CN103922349B (en) * | 2014-04-19 | 2016-02-24 | 山东银丰纳米新材料有限公司 | A kind of high anti-freezing type silicon sol and manufacture method thereof |
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