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Carbon Resistance Element: Lampblack in Alkyd and Chinese Wood Oil on Laminated Phenolic
A carbon resistance film for radio sets. Chicago Telephone Supply's Cooper (US 2,120,930, 1938) found that lampblack bound in phenolic resin kept drifting, so he bound it in alkyd resin modified with Chinese wood oil (tung oil). Sprayed on laminated phenolic and baked up to 165 °C, the film becomes insoluble and holds its value in heat and damp. His mix gave about 50,000 ohms in an element of ordinary size, with a film about 0.003 inch thick.
The picture: our diagram.
Ophakathi
1 day
Imiyalelo
1
1
Make the binder: 72 alkyd, 28 wood oil
Make the binder: 72 alkyd, 28 wood oil
Mix 72 parts of alkyd resin with 28 parts of Chinese wood oil (tung oil).
Izinto zokwakha zalesi sinyathelo:
I-alkyd resin ye-Glyptal72 parts
Uwoyela we-tung28 partsAmathuluzi adingekayo:
Isikali sesilinganiso
Ibhikha Lengilazi
Isigovuzi
Amagilavu erabha2
2
Mix 25 binder, 14 lampblack, 61 solvent
Mix 25 binder, 14 lampblack, 61 solvent
Thoroughly mix 25 parts of the binder with 14 parts of lampblack and 61 parts of a solvent for the binder. The patent does not name the solvent. Ours: xylene.
Izinto zokwakha zalesi sinyathelo:
Umsizi wesibani14 partsAmathuluzi adingekayo:
I-XyleneIsikali sesilinganisoIbhikha LengilaziIsigovuzi
Imaski yokuphefumula yobuso bonkeAmagilavu erabha3
3
Spray onto laminated phenolic
Spray onto laminated phenolic
Spray the mixture as a thin film onto a base of laminated phenolic. The patent's film is about 0.003 inch thick.
Izinto zokwakha zalesi sinyathelo:
Ishidi eliyinhlanganisela le-phenolic resin1 ucezuAmathuluzi adingekayo:
Isibhamu Sokuchela
I-compressor yomoyaImaski yokuphefumula yobuso bonkeAmagilavu erabha4
4
Bake: 40 °C up to 165 °C, hold 1 hour
Bake: 40 °C up to 165 °C, hold 1 hour
Put it in an oven at about 40 °C, raise the heat gradually over one hour to 165 °C and hold there one more hour. Take it out and let it cool; it is ready for use.
Amathuluzi adingekayo:
Ihhavini yokomisa
Ithemomitha Yehhavini
Amagilavu Amelana NokushisaIzinto
4- 72 partsIsibambeli
- 28 partsIsibambeli
- 14 partsIsibambeli
- Isibambeli
Amathuluzi Adingekayo
11- Isibambeli
- Isibambeli
- Isibambeli
- Isibambeli
- Isibambeli
- Isibambeli
- Isibambeli
- 1 vendor sell this, none ship to you yetIsibambeli
- Isibambeli
- Isibambeli
- Isibambeli
Le blueprint yenza
Ama-blueprint ahlobene
Lama-blueprint abelana ngolwazi — amasu, izinto noma izimiso
Glyptal Resin from Glycerin and Phthalic Anhydride: Callahan, 1914
ngu-Charlie
Organic
20
0
0
0
0
0
Tung Oil Pressed from the Seeds of Tung Nuts
ngu-Mary
Umsebenzi Wokhuni
10
0
0
0
0
0
Making Lampblack Pigment — Collecting Carbon Soot from a Burning Flame
ngu-Charlie
UBUCIKO
186
0
0
0
6
0
Yingozi
Laminated Phenolic Paper Sheet: Bakelite-Coated Kraft Paper Hot-Pressed and Baked (O'Conor, Westinghouse 1918)
ngu-Charlie
Kwezimboni
3
0
0
0
0
0
CC0 Isizinda Somphakathi
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