| 配方类型： |
RUBBER, RESINS, PLASTICS AND WAXES |
| 配方说明： |
Cation-Exchange Resin (Indian Patnet 47,468) |
| 配方组成： |
Formaldehyde/110 cc.
Naphthalene/52 g.
Sulfuric Acid (66'Be.)/33 cc. |
| 配制方法： |
Heat the naphthalene to 120'C. and add the acid, with stirring.
Then heat at 140 to 150'C. for 5 to 6 hours. Cool to 90'C. and add the formaldehyde, with good stirring, until a hard black resin results. Wash with water and regenerate with 5% hydrochloric acid. |
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