配方类型:

RUBBER, PLASTICS, WAXES

配方说明:

To Recondition Insoluble Shellac

配方组成:

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.