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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