Standard Test Method for Polyurethane Raw Materials: Alkalinity in Low-Alkalinity Polyols (Determination of CPR Values of Polyols)

Importancia y uso:

5.1 This test method is suitable for quality control, as a specification test and for research. The urethane reaction between polyols and isocyanates to form polyurethane polymers is known to be sensitive to the presence of basic substances. This is particularly important in the preparation of polyurethane prepolymers which contain isocyanate groups that are known to react in the presence of trace amounts of basic substances. Since many polyether polyols are often made with strongly basic catalysts, it is important to have an analytical method capable of detecting small quantities of residual basic substances. This test method is capable of detecting ppm levels of base (as KOH).4

Subcomité:

D20.22

Volúmen:

08.03

Número ICS:

83.040.01 (Raw materials for rubber and plastics in general)

Palabras clave:

alkalinity; basicity; CPR; polyether polyol; polyol; polyurethane; prepolymer; raw materials; test method; titration; urethane;