Two-component structural adhesives
AssigneeGlue Tec Industrieklebstoffe GmbH & Co. KG
InventorsMarco Holst, Lutz Schmalstieg
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Abstract
The present invention relates to a method for bonding substrates of the same or different type using two-component structural adhesives on the basis of aliphatic polyisocyanates and polyaspartic acid esters, and to a two-component structural adhesive, which contains said two components and has a high strength when hardened.
Claims21
A two-component structural adhesive comprising at least the following components,
- (i) at least one polyisocyanate having free isocyanate groups and having a content of aliphatically bound NCO groups of 16.0 to 24.0 wt. %, which is substantially free of ester and/or ether and/or carbonate groups,
- (ii) at least one amino-functional polyaspartic acid ester of the general formula
- in which n=2, and X represents a divalent organic residue obtained by removal of the amino groups from 1, 6-diaminohexane, from 2-methyl-1, 5-diaminopentane or from a linear or branched aliphatic diamine having up to 9 carbon atoms,
- wherein R1 and R2 are a methyl or an ethyl group,
- wherein the structural adhesive, in the cured state, has a tensile shear strength of at least 7 MPa, wherein the tensile shear strength is measured according to standard DIN/EN 1465 (2009-07) between two test bodies made of roughened V2A steel.
A method for the structural adhesive bonding together of identical or different substrates with two-component structural adhesives, wherein the method comprises at least the following steps:
- (1) providing a two-component structural adhesive which contains at least the following components:
- (i) at least one polyisocyanate having free isocyanate groups and having a content of aliphatically bound NCO groups of 16.0 to 24.0 wt. %, which is substantially free of ester and/or ether and/or carbonate groups,
- (ii) at least one amino-functional polyaspartic acid ester of the general formula
- in which n=2, and X represents a divalent organic residue obtained by removal of the amino groups from 1, 6-diaminohexane, from 2-methyl-1, 5-diaminopentane or from a linear or branched aliphatic diamine having up to 9 carbon atoms,
- and R1 and R2 are a methyl or an ethyl group;
- (2) structurally bonding together at least two identical or different substrates;
- (3) curing the at least one adhesive bond such that, in the cured state, the same has a tensile shear strength of at least 7 MPa, wherein the tensile shear strength is measured according to standard DIN/EN 1465 (2009-07), between two test bodies made of roughened V2A steel.
Dependencies are inferred from the claim text.