US2669764A - Manufacture of micaceous insulating materials - Google Patents
Manufacture of micaceous insulating materials Download PDFInfo
- Publication number
- US2669764A US2669764A US159379A US15937950A US2669764A US 2669764 A US2669764 A US 2669764A US 159379 A US159379 A US 159379A US 15937950 A US15937950 A US 15937950A US 2669764 A US2669764 A US 2669764A
- Authority
- US
- United States
- Prior art keywords
- billets
- barium carbonate
- mixture
- frit
- mica
- 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 - Lifetime
Links
- 238000004519 manufacturing process Methods 0.000 title claims description 10
- 239000011810 insulating material Substances 0.000 title claims description 8
- AYJRCSIUFZENHW-UHFFFAOYSA-L barium carbonate Chemical compound [Ba+2].[O-]C([O-])=O AYJRCSIUFZENHW-UHFFFAOYSA-L 0.000 claims description 24
- 239000000463 material Substances 0.000 claims description 14
- 239000000203 mixture Substances 0.000 claims description 11
- 229910052628 phlogopite Inorganic materials 0.000 claims description 11
- 238000001746 injection moulding Methods 0.000 claims description 8
- 239000010445 mica Substances 0.000 description 13
- 229910052618 mica group Inorganic materials 0.000 description 13
- 238000010438 heat treatment Methods 0.000 description 5
- 239000004615 ingredient Substances 0.000 description 5
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 4
- 239000011521 glass Substances 0.000 description 4
- 238000000465 moulding Methods 0.000 description 4
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 3
- AYJRCSIUFZENHW-DEQYMQKBSA-L barium(2+);oxomethanediolate Chemical compound [Ba+2].[O-][14C]([O-])=O AYJRCSIUFZENHW-DEQYMQKBSA-L 0.000 description 3
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 3
- 239000004327 boric acid Substances 0.000 description 3
- 229910000464 lead oxide Inorganic materials 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- YEXPOXQUZXUXJW-UHFFFAOYSA-N oxolead Chemical compound [Pb]=O YEXPOXQUZXUXJW-UHFFFAOYSA-N 0.000 description 3
- 230000001427 coherent effect Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 229910001610 cryolite Inorganic materials 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 229910000027 potassium carbonate Inorganic materials 0.000 description 2
- 238000009877 rendering Methods 0.000 description 2
- 229910000029 sodium carbonate Inorganic materials 0.000 description 2
- 235000017550 sodium carbonate Nutrition 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- 229920001353 Dextrin Polymers 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- FYGDTMLNYKFZSV-MRCIVHHJSA-N dextrin Chemical compound O[C@@H]1[C@@H](O)[C@H](O)[C@@H](CO)OC1O[C@@H]1[C@@H](CO)OC(O[C@@H]2[C@H](O[C@H](O)[C@H](O)[C@H]2O)CO)[C@H](O)[C@H]1O FYGDTMLNYKFZSV-MRCIVHHJSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 229920000609 methyl cellulose Polymers 0.000 description 1
- 239000001923 methylcellulose Substances 0.000 description 1
- 235000010981 methylcellulose Nutrition 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/02—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances
- H01B3/04—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances mica
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C14/00—Glass compositions containing a non-glass component, e.g. compositions containing fibres, filaments, whiskers, platelets, or the like, dispersed in a glass matrix
- C03C14/004—Glass compositions containing a non-glass component, e.g. compositions containing fibres, filaments, whiskers, platelets, or the like, dispersed in a glass matrix the non-glass component being in the form of particles or flakes
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C2214/00—Nature of the non-vitreous component
- C03C2214/04—Particles; Flakes
Definitions
- This invention relates to micaceous insulating materials oi the kind which are formed by mixing low fusing point vitreous material with powdered mica and heating the mixture so that the mica is bonded to the vitreous material at a temperature below the point of total dehydration.
- An example of such material is that known under the registered trade-mark.
- Mycalex whose manufacture is described inter alia in the specification of United States Patent No. 2,303,244.
- the object of the present invention is to provide a new form of material having the general character described in the preceding paragraph but which possesses, in addition to the dielectric and other advantageous properties of such material, the capability of being formed into a variety of articles by injection moulding in a more expeditious and economical manner than has been possible hitherto with materials of the general class above described.
- a method of manufacturing a micaceous insulating material which consists in mixing a white glass frit with barium carbonate and phlogopite mica, in forming the mixture into billets or blocks, in subjecting the billets or blocks to a rise in temperature in a furnace and in moulding and cooling the heat treated material.
- a mixture consisting of a white glass frit, barium carbonate and phlogopite mica.
- the frit consisting of cryolite, barium carbonate, potassium carbonate, soda ash and boric acid may be and preferably is formed described in the aforesaid U. S. specification No. 2,303,244.
- the frit may be prepared from the ingredients in the proportions as follows:
- All the ingredients of the mixture are initially ground to a particle size capable of passing a mesh of 100 x 100 per square inch.
- the preferred proportions of the ingredients that is of the frit, the barium carbonate and the phlogopite mica, consist in one third of each by weight but, although the proportions may be varied, it has been found essential for the best results in the finished articles that the proportions of the frit and the phlogopite mica should be equal.
- the proportions by weight of the frit and the phlogopite mica should not be greater than 45% of each nor less than 30% of each.
- the billets After formation, as described, the billets are allowed to dry for a period up to five days in length.
- small proportion of methyl cellulose of dextrine may be added to the water and being volatile, this added matter disappears when the material is heat treated as hereinafter described.
- the billets After the billets have been dried they are furnace treated to a temperature of the order of degrees C. the time of treatment varying with the weight of the billet treated. It has been found in practice that on the average the time of heat treatment required is about 7 minutes per ounce weight of the billet treated. From the furnace the billets are transferred directly to an injection moulding apparatus which may conveniently be of one of the forms described in the specification of our British Patent No. 601,772. It is essential, however, for satisfactory results to be obtained that the temperature of the mould shall be maintained at from 300 to 350 degrees centigrade and that the moulded articles produced shall be cooled slowly.
- the process above described may be modified by including lead oxide in the proportion of 10% by weight with the barium carbonate, as although this addition adds somewhat to the cost of production, it has the advantage of enabling the mould temperature to be reduced to one of the order of 300 degrees centigrade.
- the invention possesses the advantage that in comparison with previously known processes for producing an injection moulding material of the Mycalex class, the production costs are reduced as are also the power factor and the specific gravity of the products.
- the lowering of the specific gravity approximately to 2 is an important advantage in that the weight of the material, as compared with previous products of a similar character, is approximately halved for a given volume, thereby rendering the products adapted for aircraft and for other uses where weight is an important factor.
- a micaceous insulating material characterized by its injection moulding properties comprising in mixing a white glass frit with barium carbonate and phlogopite mica, in forming the mixture into billets or blocks, in subjecting the billets or blocks to a rise in temperature in a furnace and in moulding and cooling the heat treated material said frit, barium carbonate and mica beingeach-employed in the proportion of substantially one-third by weight.
- the method of manufacturing an article a micaceous insulating material characterized by its injection moulding properties comprising in heating a mixture of cryolite, barium carbonate, potassium carbonate, sodaash and *boric acid to form a white glass frit, in mixing said f rit with barium carbonate and phlogopite mica,in grinding the mixture to fine particle siza in iorrning the ground ingredients into billets under :pressure, in heating said billets and in injection moulding the heat treated material said -frit, barium carbonate andlmica being each employed -.in zthe proportion :of substantially one-third :by weight.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Ceramic Engineering (AREA)
- Dispersion Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Inorganic Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Inorganic Insulating Materials (AREA)
Description
Patented Feb. 23, 1954 MANUFACTURE OF MICACEOUS INSULATING MATERIALS James S. Kilpatrick, Cirencester, England, as=
signer to The Mycalex Company Limited, Cirencester, England, a British company No Drawing. Application May 1, 1950, Serial No. 159,379
Claims. (Cl. -456) This invention. relates to micaceous insulating materials oi the kind which are formed by mixing low fusing point vitreous material with powdered mica and heating the mixture so that the mica is bonded to the vitreous material at a temperature below the point of total dehydration. An example of such material is that known under the registered trade-mark. Mycalex whose manufacture is described inter alia in the specification of United States Patent No. 2,303,244.
The object of the present invention is to provide a new form of material having the general character described in the preceding paragraph but which possesses, in addition to the dielectric and other advantageous properties of such material, the capability of being formed into a variety of articles by injection moulding in a more expeditious and economical manner than has been possible hitherto with materials of the general class above described.
According to the invention a method of manufacturing a micaceous insulating material is provided which consists in mixing a white glass frit with barium carbonate and phlogopite mica, in forming the mixture into billets or blocks, in subjecting the billets or blocks to a rise in temperature in a furnace and in moulding and cooling the heat treated material.
In carrying the invention into effect and in the preferred manner, a mixture is prepared consisting of a white glass frit, barium carbonate and phlogopite mica. The frit consisting of cryolite, barium carbonate, potassium carbonate, soda ash and boric acid may be and preferably is formed described in the aforesaid U. S. specification No. 2,303,244. Alternatively, the frit may be prepared from the ingredients in the proportions as follows:
Per cent Barium carbonate 46.75 Boric acid 20.00 Aluminium oxide 0.25 Phlogopite mica 33.00
All the ingredients of the mixture are initially ground to a particle size capable of passing a mesh of 100 x 100 per square inch. In preparing the mixture the preferred proportions of the ingredients, that is of the frit, the barium carbonate and the phlogopite mica, consist in one third of each by weight but, although the proportions may be varied, it has been found essential for the best results in the finished articles that the proportions of the frit and the phlogopite mica should be equal. For satisfactory results, the proportions by weight of the frit and the phlogopite mica should not be greater than 45% of each nor less than 30% of each. After thoroughly mixing the said ingredients they are formed into billets, a small proportion of water being added to assist in forming a coherent body under the moulding pressure.
After formation, as described, the billets are allowed to dry for a period up to five days in length. To assist in rendering the material coherent and capable of readily forming into billets small proportion of methyl cellulose of dextrine may be added to the water and being volatile, this added matter disappears when the material is heat treated as hereinafter described.
After the billets have been dried they are furnace treated to a temperature of the order of degrees C. the time of treatment varying with the weight of the billet treated. It has been found in practice that on the average the time of heat treatment required is about 7 minutes per ounce weight of the billet treated. From the furnace the billets are transferred directly to an injection moulding apparatus which may conveniently be of one of the forms described in the specification of our British Patent No. 601,772. It is essential, however, for satisfactory results to be obtained that the temperature of the mould shall be maintained at from 300 to 350 degrees centigrade and that the moulded articles produced shall be cooled slowly.
The process above described may be modified by including lead oxide in the proportion of 10% by weight with the barium carbonate, as although this addition adds somewhat to the cost of production, it has the advantage of enabling the mould temperature to be reduced to one of the order of 300 degrees centigrade.
The invention possesses the advantage that in comparison with previously known processes for producing an injection moulding material of the Mycalex class, the production costs are reduced as are also the power factor and the specific gravity of the products. The lowering of the specific gravity approximately to 2 is an important advantage in that the weight of the material, as compared with previous products of a similar character, is approximately halved for a given volume, thereby rendering the products adapted for aircraft and for other uses where weight is an important factor.
I claim:
1. The method of manufacturing a micaceous insulating material characterized by its injection moulding properties comprising in mixing a white glass frit with barium carbonate and phlogopite mica, in forming the mixture into billets or blocks, in subjecting the billets or blocks to a rise in temperature in a furnace and in moulding and cooling the heat treated material said frit, barium carbonate and mica beingeach-employed in the proportion of substantially one-third by weight.
2. The method of manufacturing an article a micaceous insulating material characterized by its injection moulding properties comprising in heating a mixture of cryolite, barium carbonate, potassium carbonate, sodaash and *boric acid to form a white glass frit, in mixing said f rit with barium carbonate and phlogopite mica,in grinding the mixture to fine particle siza in iorrning the ground ingredients into billets under :pressure, in heating said billets and in injection moulding the heat treated material said -frit, barium carbonate andlmica being each employed -.in zthe proportion :of substantially one-third :by weight.
:.3. The method according to claim 1 wherein :approximatelytten per cent lead oxide isincluded with Ethe zbarium carbonate.
The :methodas defined in claim 2 wherein approximately ten per cent lead oxide is included with the barium carbonate.
5. In the method of manufacturing billets of a micaceous insulating material suitable for injection moulding, the steps of preparing a mixtune of finely ground yvhiteglasslfrit, barium carbonate and -phlogopite mica, the hit and the phlogopite mica being present in substantially equal proportions, forming the said mixture into 1bil1ets1under pressure, allowing the billets to dry ,angl subjecting the dried billets to heat treatment in a furnace up to a temperature in the neighbor- "hood of 850 C., -transi1erring the billets from the furnace to an injection mold maintained at a temperature ofirom 300 to 500 C., molding the billets the injection mold, and allowing the 'injegtion molded products to cool slowly.
JAMES S. KILPATRICK.
Nam a -Wedlock Feb. 25, 1936 Wed1ock..- .-l- Nov. 2 491 :Number
Claims (1)
1. THE METHOD OF MANUFACTURING A MICACEOUS INSULATING MATERIAL CHARACTERIZED BY ITS INJECTION MOULDING PROPERTIES COMPRISING IN MIXTURE A WHITE GLASS FRIT WITH BARIUM CARBONATE AND PHLOGOPITE MICA, IN FORMING THE MIXTURE INTO BILLETS OR BLOCKS, IN SUBJECTING THE BILLETS OR BLOCKS TO A RISE IN TEMPERATURE IN A FURNACE AND IN MOULDING AND COOLING THE HEAT TREATED MATERIAL SAID FRIT BARIUM CARBONATE AND MICA BEING EACH EMPLOYED ON THE PROPORTION OF SUBSTANTIALLY ONE-THIRD BY WEIGHT.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US159379A US2669764A (en) | 1950-05-01 | 1950-05-01 | Manufacture of micaceous insulating materials |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US159379A US2669764A (en) | 1950-05-01 | 1950-05-01 | Manufacture of micaceous insulating materials |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US2669764A true US2669764A (en) | 1954-02-23 |
Family
ID=22572359
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US159379A Expired - Lifetime US2669764A (en) | 1950-05-01 | 1950-05-01 | Manufacture of micaceous insulating materials |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US2669764A (en) |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2829061A (en) * | 1952-09-24 | 1958-04-01 | Jay E Comeforo | Machinable ceramic bonded material and method for producing same |
| US2842183A (en) * | 1956-09-24 | 1958-07-08 | Gen Electric | Mica paper |
| US2897573A (en) * | 1957-07-19 | 1959-08-04 | Mycalex Corp Of America | Ceramoplastic and method of manufacturing same |
| US3057741A (en) * | 1959-09-15 | 1962-10-09 | Mycalex Corp Of America | Method of making ceramoplastic material |
| US3215543A (en) * | 1960-12-08 | 1965-11-02 | Saint Gobain | Vitreous body including mica in finely divided state |
| US3235655A (en) * | 1962-12-31 | 1966-02-15 | Gen Motors Corp | Resistor composition and devices embodying same |
| DE1225092B (en) * | 1961-03-16 | 1966-09-15 | Mycalex & T I M Ltd | Process for the production of a mica-containing insulating material |
| US3377164A (en) * | 1965-01-25 | 1968-04-09 | Gen Dynamics Corp | Method for powdered metal forming |
| US3457091A (en) * | 1965-03-19 | 1969-07-22 | Haveg Industries Inc | Glass bonded alumina |
| US3485645A (en) * | 1965-10-21 | 1969-12-23 | Ppg Industries Inc | Heterogeneous glass |
| EP0421391A1 (en) * | 1989-10-03 | 1991-04-10 | Mitsui Mining Company, Limited | Production process for machinable ceramics |
| FR2950048A1 (en) * | 2009-09-17 | 2011-03-18 | Saint Gobain Quartz Sas | Composition, useful for obtaining composite material, which is useful in electrical insulator, comprises mica and glass comprising silicon dioxide, barium oxide, boron trioxide, and zinc oxide, alkali oxide and alkaline-earth oxide |
| WO2011033214A1 (en) * | 2009-09-17 | 2011-03-24 | Saint-Gobain Quartz S.A.S | Glass for insulating composition |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2032239A (en) * | 1933-10-26 | 1936-02-25 | Wedlock Albert William Henry | Manufacture of an improved vitreous material |
| US2303244A (en) * | 1939-08-15 | 1942-11-24 | Wedlock Albert William Henry | Manufacture of insulating material |
-
1950
- 1950-05-01 US US159379A patent/US2669764A/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2032239A (en) * | 1933-10-26 | 1936-02-25 | Wedlock Albert William Henry | Manufacture of an improved vitreous material |
| US2303244A (en) * | 1939-08-15 | 1942-11-24 | Wedlock Albert William Henry | Manufacture of insulating material |
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2829061A (en) * | 1952-09-24 | 1958-04-01 | Jay E Comeforo | Machinable ceramic bonded material and method for producing same |
| US2842183A (en) * | 1956-09-24 | 1958-07-08 | Gen Electric | Mica paper |
| US2897573A (en) * | 1957-07-19 | 1959-08-04 | Mycalex Corp Of America | Ceramoplastic and method of manufacturing same |
| US3057741A (en) * | 1959-09-15 | 1962-10-09 | Mycalex Corp Of America | Method of making ceramoplastic material |
| US3215543A (en) * | 1960-12-08 | 1965-11-02 | Saint Gobain | Vitreous body including mica in finely divided state |
| DE1225092B (en) * | 1961-03-16 | 1966-09-15 | Mycalex & T I M Ltd | Process for the production of a mica-containing insulating material |
| US3235655A (en) * | 1962-12-31 | 1966-02-15 | Gen Motors Corp | Resistor composition and devices embodying same |
| US3377164A (en) * | 1965-01-25 | 1968-04-09 | Gen Dynamics Corp | Method for powdered metal forming |
| US3457091A (en) * | 1965-03-19 | 1969-07-22 | Haveg Industries Inc | Glass bonded alumina |
| US3485645A (en) * | 1965-10-21 | 1969-12-23 | Ppg Industries Inc | Heterogeneous glass |
| EP0421391A1 (en) * | 1989-10-03 | 1991-04-10 | Mitsui Mining Company, Limited | Production process for machinable ceramics |
| FR2950048A1 (en) * | 2009-09-17 | 2011-03-18 | Saint Gobain Quartz Sas | Composition, useful for obtaining composite material, which is useful in electrical insulator, comprises mica and glass comprising silicon dioxide, barium oxide, boron trioxide, and zinc oxide, alkali oxide and alkaline-earth oxide |
| WO2011033214A1 (en) * | 2009-09-17 | 2011-03-24 | Saint-Gobain Quartz S.A.S | Glass for insulating composition |
| CN102482139A (en) * | 2009-09-17 | 2012-05-30 | 圣戈班石英有限公司 | Glass for insulating composition |
| US20120171420A1 (en) * | 2009-09-17 | 2012-07-05 | Saint-Gobain Quartz S.A.S. | Glass for insulating composition |
| US9171657B2 (en) * | 2009-09-17 | 2015-10-27 | Saint-Gobain Quartz S.A.S. | Glass for insulating composition |
| EA024046B1 (en) * | 2009-09-17 | 2016-08-31 | Сэн-Гобэн Кварц С.А.С | Glass for insulating composition |
| CN102482139B (en) * | 2009-09-17 | 2016-10-19 | 圣戈班石英有限公司 | Glass for insulation composition |
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