US2327372A - Dielectric for electrostatic condensers - Google Patents
Dielectric for electrostatic condensers Download PDFInfo
- Publication number
- US2327372A US2327372A US271521A US27152139A US2327372A US 2327372 A US2327372 A US 2327372A US 271521 A US271521 A US 271521A US 27152139 A US27152139 A US 27152139A US 2327372 A US2327372 A US 2327372A
- Authority
- US
- United States
- Prior art keywords
- dielectric
- oil
- castor oil
- electrostatic
- hydrogenated castor
- 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
- 239000004359 castor oil Substances 0.000 description 12
- 235000019438 castor oil Nutrition 0.000 description 12
- ZEMPKEQAKRGZGQ-XOQCFJPHSA-N glycerol triricinoleate Natural products CCCCCC[C@@H](O)CC=CCCCCCCCC(=O)OC[C@@H](COC(=O)CCCCCCCC=CC[C@@H](O)CCCCCC)OC(=O)CCCCCCCC=CC[C@H](O)CCCCCC ZEMPKEQAKRGZGQ-XOQCFJPHSA-N 0.000 description 12
- 239000003921 oil Substances 0.000 description 8
- 235000019198 oils Nutrition 0.000 description 8
- 235000015112 vegetable and seed oil Nutrition 0.000 description 5
- 239000008158 vegetable oil Substances 0.000 description 5
- 239000007788 liquid Substances 0.000 description 2
- 239000008247 solid mixture Substances 0.000 description 2
- MXHKJQTYOAFPBY-UHFFFAOYSA-N 2-(2,3-dihydroxypropoxycarbonyl)benzoic acid Chemical compound OCC(O)COC(=O)C1=CC=CC=C1C(O)=O MXHKJQTYOAFPBY-UHFFFAOYSA-N 0.000 description 1
- 230000002745 absorbent Effects 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000002385 cottonseed oil Substances 0.000 description 1
- 235000012343 cottonseed oil Nutrition 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 239000003989 dielectric material Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000005984 hydrogenation reaction Methods 0.000 description 1
- 239000002480 mineral oil Substances 0.000 description 1
- 235000010446 mineral oil Nutrition 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- -1 which is a hard 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
- H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
- H01B3/20—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances liquids, e.g. oils
- H01B3/22—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances liquids, e.g. oils hydrocarbons
Definitions
- An object of the invention is to improve the characteristics of an electrostatic condenser, for
- oils will combine with the hydrogenated castor oil to form compositions suitable as dielectrics.
- mineral oil which is the most widely used dielectric oil employed in electrostatic condensers, is not suitable.
- glyceryl phthalate preferably in the liquid form, may be substituted for part or all of the oil and that it combines with the hydrogenated castor oil.
- The'dielectric of this invention may be prepared by heating the hydrogenated castor oil to liquid form and adding the vegetable oil.
- the proportion of added oil may be from 5% to What is claimed is:
Landscapes
- Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Lubricants (AREA)
- Organic Insulating Materials (AREA)
Description
Patented Aug. 24, 1943 DIELECTRIC FOR ELECTROSTATIC CONDENSERS Samuel Ruben, New Rochelle, N. Y.
No Drawing. Application May 3, 1939, Serial No. 271,521
3 Claims. This invention relates to electrostatic condensers.
This application is a continuation in part of my copending application Serial No, 88,534, filed July 2, 1936. B
An object of the invention is to improve the characteristics of an electrostatic condenser, for
Since oil will flow at ordinary temperatures, it
is necessary to use unusual precaution in the sealing of the condenser and in the construction of the con.ainer. Many unsaturated oils, such as castor oil, tend to oxidize when exposed to the air, resulting in reaction products such as water and acids which cause deterioration of the condenser.
The hydrogenation of the unsaturated compounds tends to stabilize them so that under the electrostatic stresses they do not dissociate and cause ionization.
Hydrogenated castor oil, which is a hard, solid material, has long been known to the condenser art to possess a high dielectric constant but its applicationas a dielectric medium in an electrostatic condenser has not to date been practical because of its excessively high power factor and tendency to crack. In order to use hydrogenated castor oil as an impregnant, it is necessary to heat it up to liquification temperature so as to allow complete penetration of the absorbent paper spacers. As the oil cools and solidifies. however, minute cracks develop throughout the entire mass, thus bringing about low break down potentials and allowing absorption of moisture. The excessive power factor eventually brings about overheating and decomposition.
I have found that by combining hydrogenated castor oil with a vegetable oil, such as castor oil, oiticica oil or cottonseed oil that a new and improved dielectric is obtained having all the high capacitance advantages of hydrogenated castor oil but possessing none of its disadvantages in respect to cracking, brittleness, etc.
I have found that not all oils will combine with the hydrogenated castor oil to form compositions suitable as dielectrics. For instance, mineral oil, which is the most widely used dielectric oil employed in electrostatic condensers, is not suitable.
I have also found that glyceryl phthalate, preferably in the liquid form, may be substituted for part or all of the oil and that it combines with the hydrogenated castor oil.
The'dielectric of this invention may be prepared by heating the hydrogenated castor oil to liquid form and adding the vegetable oil. The proportion of added oil may be from 5% to What is claimed is:
1. A solid condenser dielectric consisting substantially of hydrogenated castor oil and an added vegetable oil, the latter being present in the proportion of from 5% to 50%.
2. A dielectric for electrostatic condensers and the like consisting substantially of a solid composition of hydrogenated castor oil and 5% to 50% of a vegetable oil miscible therewith.
3. A condenser having a dielectric consisting substantially of a solid mixture of hydrogenated castor oil and from 5% to 50% of unhydrogenated vegetable oil.
SAMUEL RUBEN.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US271521A US2327372A (en) | 1939-05-03 | 1939-05-03 | Dielectric for electrostatic condensers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US271521A US2327372A (en) | 1939-05-03 | 1939-05-03 | Dielectric for electrostatic condensers |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US2327372A true US2327372A (en) | 1943-08-24 |
Family
ID=23035940
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US271521A Expired - Lifetime US2327372A (en) | 1939-05-03 | 1939-05-03 | Dielectric for electrostatic condensers |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US2327372A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2682024A (en) * | 1950-08-30 | 1954-06-22 | Bell Telephone Labor Inc | Electrical condenser and dielectric composition useful therein |
| US2794940A (en) * | 1952-12-26 | 1957-06-04 | Globe Union Inc | Multiple k dielectric |
| US4609969A (en) * | 1984-10-22 | 1986-09-02 | Emhart Industries, Inc. | Dielectric fluid for metallized polypropylene film capacitors |
| US4931900A (en) * | 1988-05-10 | 1990-06-05 | Magnetek Universal Mfg., Corp. | Dielectric fluid for a metallized film capacitor |
-
1939
- 1939-05-03 US US271521A patent/US2327372A/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2682024A (en) * | 1950-08-30 | 1954-06-22 | Bell Telephone Labor Inc | Electrical condenser and dielectric composition useful therein |
| US2794940A (en) * | 1952-12-26 | 1957-06-04 | Globe Union Inc | Multiple k dielectric |
| US4609969A (en) * | 1984-10-22 | 1986-09-02 | Emhart Industries, Inc. | Dielectric fluid for metallized polypropylene film capacitors |
| US4931900A (en) * | 1988-05-10 | 1990-06-05 | Magnetek Universal Mfg., Corp. | Dielectric fluid for a metallized film capacitor |
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