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US 2019/0316013 A1Published application
Two-Component Polyurethane Adhesive
AssigneeHenkel AG & Co. KGaA
InventorsTingting Tang, Jie Liu
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Abstract
The present disclosure relates to a two-component polyurethane adhesive, based on a polyol component A and a polyisocyanate component B. The two-component polyurethane adhesive exhibits fast cure speed, good adhesion properties and good durability. The two-component polyurethane adhesive is developed for the adhesion adhesion of substrates, wherein the substrates are preferably selected from the group comprising sheet molding compounds (SMCs) and plastic substrates.
Claims16
A two-component polyurethane composition consisting of component A and component B, wherein:
- component A, comprises
- a) a mixture of at least one polyether polyol and at least one polyester polyol, the polyether polyol and the polyester polyol each independently having a number average molecular weight of 300 to 3500 g/mol,
- b) at least one polyol having from 2 to 4 hydroxyl groups per molecule and a number average molecular weight of below 200 g/mol,
- c) at least one polyamine having a number average molecular weight of 200 to 600 g/mol,
- d) at least one catalyst selected from Sn-containing catalysts and Bi-containing catalysts and optionally a blocked aza-type catalyst, wherein the blocked aza-type catalyst is an aza-type catalyst blocked with a blocking agent,
- g) optionally at least one additive;
- and
- component B comprises
- a NCO-terminated prepolymer prepared from the reaction of
- e) at least one polyether polyol having a number average molecular weight of 300 to 3500 g/mol, and
- f) at least one polyisocyanate,
- wherein the NCO content of the prepolymer is from 4 to 13% by weight,
- based on the total weight of component B.
10 more elements
Dependencies are inferred from the claim text.