Determination of NCO in polyurethane by automatic potentiometric titration
April 27 09:01:49, 2021
The isocyanate-based components of the polyurethane prepolymer containing the free isocyanate group, the one-component moisture assimilation polyurethane adhesive and the two-component polyurethane adhesive should be controlled within a certain range, otherwise the polyurethane The stability of the adhesive, even the gel, must also be tested to ensure the quality of the product. The isocyanate group is reacted with an excess of di-n-butylamine to produce urea, and the excess di-n-butylamine is titrated with hydrochloric acid to quantitatively calculate the isocyanate group content.
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