Spandex is the generic name for the synthetic fiber, whose fiber-forming substance is a long chain of a synthetic polymer. Typically, the spandex fiber structure is achieved by reacting di-isocyanates with long chain glycols, which are usually polyesters or polyethers. Next, the polymer is dissolved into dimethyl acetamide (DMAC) and then chain-extended or coupled through the use of glycol, diamine or water. Other solvents can also be used.
Vaisala K-PATENTS® Process Refractometer PR-43-G is perfectly suited to control the spinning bath concentration.
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