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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.
中级
1 day
说明
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).
此步骤所需材料：
甘酞醇酸树脂72 parts
桐油28 parts所需工具：
等臂天平
玻璃烧杯
搅拌器
橡胶手套2
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.
此步骤所需材料：
灯烟墨14 parts所需工具：
二甲苯等臂天平玻璃烧杯搅拌器
全面罩呼吸器橡胶手套3
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.
此步骤所需材料：
酚醛树脂复合板1 个所需工具：
喷枪
空气压缩机全面罩呼吸器橡胶手套4
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.
所需工具：
干燥炉
烤箱温度计
耐热手套此蓝图制作
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