配方类型:

COSMETICS AND DRUGS

配方说明:

Depilatories (Formula 2)

配方组成:

Thioglycolic acid has been widely used, not only in america, but
throughout the world, for the formulation of depilatories. It is
commonly accepted at the present time as "the mercaptan" to be used in
depilatories. Either the straight thioglycolic acid or its calcium salt
may be used.
Because thioglycolates are the principal ingredients of depilatories,
it is necessary (as in the case of cold waving lotions) to keep to the
minimum the metallic impurities in the other ingredients used in
manufacturing the product.
Properly formulated depilatory creams are stable and have a shelf life
of over one year. The container must be tightly sealed or the cream will
rapidly lose its strength through oxidation.
Although tin is the most satisfactory material for tubes, it is possible
today to buy wax-lined lead tubes that give satisfactory protection.
Most depilatories on the market contain about 2.5%-3% thioglycolic acid
and are adjusted to a pH a

配制方法:

Depilatory is prepared in two parts and then mixed together, as follows: Part I: (For all four formulas) Heat 60 kg of distilled water to 70'C.
Add the cetyl alcohol and the "Brij" 35 with constant stirring until completely dissolved. Discontinue stirring and allow to stand and cool to room temperature.
Part II: (For formulas 1 and 2) To 14 liters of distilled water add the thioglycolic acid (70%) and stir. Slowly add the calcium hydroxide while stirring. Add the strontium hydroxide at this point (only to formula I). Add sufficient distilled water to make Part B weight 33 kg.
Combine Part II with Part I and stir well. Add perfume at this point as desired.
The final product should be assayed for content of thioglycolic acid, pH, and depilation time.
In the manufacture of depilatories it is extremely important that the equipment used should not be a source of contamination of the product.
In general, the same materials that are suitable for the handling of cold waves are also suita