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|1. (WO2017017089) HYDROPHOBIC AND HIGHLY ELASTIC TWO-COMPONENT POLYURETHANE COMPOSITION HAVING MECHANICAL PROPERTIES AND ADHESIVE PROPERTIES NOT DEPENDENT ON TEMPERATURE|
|Applicants:||SIKA TECHNOLOGY AG
|Title:||HYDROPHOBIC AND HIGHLY ELASTIC TWO-COMPONENT POLYURETHANE COMPOSITION HAVING MECHANICAL PROPERTIES AND ADHESIVE PROPERTIES NOT DEPENDENT ON TEMPERATURE|
The invention relates to a two-component polyurethane composition, comprising a first component, which comprises at least one polybutadiene polyol P1 having an average molecular weight in the range of 2,000 to 10,000 g/mol and an average OH functionality in the range of 2.1 to 4, and a second component, which comprises at least one polyisocyanate and optionally at least one isocyanate-terminated polyurethane prepolymer. The composition also contains at least one hydrophobic diol P2 having an average molecular weight in the range of 500 to 5,000 g/mol, which is selected from the group consisting of polybutadiene diols, polyester diols, polycarbonate diols, polyether diols having a repeat unit having at least 4 C atoms, and/or at least one hydrophobic compound P3, which is terminated with amino groups and has an average molecular weight in the range of 200 to 2,000 g/mol. The ratio of the number of hydroxyl groups from the polybutadiene polyol P1 to the number of hydroxyl and primary and secondary amino groups from the diol P2 and the compound P3 lies in the range of 2:1 to 16:1. The cured composition is characterized by very good adhesion properties on substrates having low surface energy and by high strength only weakly dependent on temperature in the temperature range of -45 °C to approximately +150 °C and is therefore particularly suitable as a structural adhesive.