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Вискоза, хим., продукт, получаемый после обработки хлопчатобумажной клетчатки последовательно едким натром и сернистым углеродом; желтоватая масса, дающая с водой густой и вязкий раствор. Применяется для проклейки бумаги, для аппретуры тканей, в качестве загустителя и закрепителя красок при печатании тканей, при изготовлении искусственного шелка.
Вискоза это концентрированный раствор ксантогената целлюлозы в разбавленном растворе едкого натра. Ее применяют для получения вискозных волокон и плёнок (целлофана), искусственной кожи (кирзы) и др. Основное сырьё — древесная целлюлоза. Вначале целлюлозу обрабатывают водным раствором едкого натра (мерсеризация) до образования так называемой щелочной целлюлозы, которую затем измельчают (для увеличения реакционной способности) и подвергают в среде воздуха окислительной деструкции (с целью уменьшения её молекулярной массы). После этого целлюлозу обрабатывают сероуглеродом, в результате чего образуется её ксантогенат, который далее растворяют в водном растворе едкого натра (при t 10—12°С). Все эти процессы проводят в одном или нескольких аппаратах непрерывного и периодического действия.
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