Polyaspartics with long pot life and fast curing
AssigneeSika Technology AG
InventorsDenis KOPP, Hagen SCHWEIGERT
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Abstract
A two-component polyurea compositions including a polyisocyanate component and a hardener component. The hardener component includes at least a derivative of aspartic acid and at least one salt hydrate with a decomposition temperature of between 30° C. and 150° C. This composition allows to be applied to a large area and/or thick layers or high volume casts and shows fast curing triggered by heat but long pot life at application temperature.
Claims16
A two-component polyurea composition, comprising a polyisocyanate component C1 and a hardener component C2,
- wherein
- the polyisocyanate component C1 comprises at least a polyisocyanate PI;
- the hardener component C2 comprises at least a compound of formula (I)
- wherein
- R1 represents a n-valent organic radical;
- R2 and R3 represent independently of one another an aliphatic or cycloaliphatic or aromatic radical;
- n is an integer with a value of 2 to 6;
- wherein
- the hardener component C2 comprises at least one salt hydrate SH with a decomposition temperature of between 30° C. and 150° C.
A method of curing or accelerating the curing of a two-component polyuria composition comprising:
- providing a two-component polyurea composition, comprising a polyisocyanate component C1 and a hardener component C2,
- wherein
- the polyisocyanate component C1 comprises at least a polyisocyanate PI;
- the hardener component C2 comprises at least a compound of formula (I)
- wherein
- R1 represents a n-valent organic radical;
- R2 and R3 represent independently of one another an aliphatic or cycloaliphatic or aromatic radical;
- n is an integer with a value of 2 to 6;
- wherein
- the hardener component C2 comprises at least one salt hydrate SH with a decomposition temperature of between 30° C. and 150° C.;
- and
- using a salt hydrate SH with a decomposition temperature of between 30° C. and 150° C. to catalyze or accelerate the curing of the two-component polyurea composition.
Dependencies are inferred from the claim text.