Polyurethane prepolymer composition and preparation method therefor and use thereof

Abstract

A polyurethane prepolymer composition and a preparation method therefor and a use thereof. The polyurethane prepolymer composition is aliphatic isocyanate end-capped, and is obtained by reacting aliphatic isocyanate with polyol; the mass percentage content of 1,5-pentamethylene diisocyanate in the aliphatic isocyanate is greater than or equal to 50%; the polyurethane prepolymer composition comprises a combination of a first prepolymer and a second prepolymer, the first prepolymer is an adduct formed by aliphatic isocyanate and polyol according to a molar ratio of 2:1, and the second prepolymer is an adduct formed by aliphatic isocyanate and polyol according to a molar ratio of (n+1):n, wherein n≥2; the mass percentage content of the second prepolymer in the polyurethane prepolymer composition is 15-75%. The polyurethane prepolymer composition has the advantages of large molecular weight, low viscosity and excellent constructability, and the physical properties of a polyurethane product prepared by means of the polyurethane prepolymer composition is remarkably improved.

Dependencies are inferred from the claim text.