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TECHNOLOGY OF OBTAINING ARTIFICIAL SILK
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About 20 g of copper hydrogencarbonate is dissolved in a 25% solution of ammonia by the route of its gradual addition to the salt also with constant stirring. Copper ammonium solution is added to the medical cotton wool in small portions and mixed until the fiber is completely dissolved, also obtaining a viscous mass.
Dissolution of cotton wool moves slowly, so the experiment can be postponed for 1-3 days. To obtain artificial filament yarn, a copper ammoniacal solution of the fiber is collected into a medical syringe and squeezed out through a needle immersed in a precipitation solution, which is a 10-15% solution of sulfuric or hydrochloric acid .
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