| 配方类型： |
RUBBER, PLASTICS, WAXES |
| 配方说明： |
To Recondition Insoluble Shellac |
| 配制方法： |
Grind the shellac to 20-30-mesh and mix well with an equal weight of methanol. Add 0.5% sulfuric acid (on the weight of shellac). Mix well and heat to reflux temperature. Cool and neutralize with whiting; filter to obtain a shellac solution. If sebacic acid is used in place of sulfuric acid, neutralization is not necessary. |
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