Hydrophobic polyurethane adhesive

Patent metadata

Field	Value
Publication number	US-9567500-B2
Application number	US-201414901138-A
Country	US
Kind code	B2
Filing date	Jun 16, 2014
Priority date	Jun 25, 2013
Publication date	Feb 14, 2017
Grant date	Feb 14, 2017

Abstract

The present invention relates to a polyurethane adhesive comprising an isocyanate component A and a polyol component B where the isocyanate component A comprises at least one diisocyanate or polyisocyanate and the polyol component B comprises the alkoxylation product of a mixture of castor oil or ricinoleic acid (i), of an aromatic di- or polyol (ii), and of an OH-functional compound having aliphatically bonded OH groups and OH-functionality of from 1 to 8 (iii), and also optionally of a compound (iv), selected from the group consisting of cyclic anhydrides of dicarboxylic acids, and optionally of a compound (v) selected from the group consisting of cyclic mono- or diesters. The present invention further relates to a process for adhesive bonding with use of the polyurethane adhesive of the invention, to an item adhesive-bonded with the use of the polyurethane adhesive, and to the use of said item in the construction of wind turbines.

First claim

The invention claimed is:

1. A polyurethane adhesive comprising an isocyanate component A and a polyol component B,
wherein:
the isocyanate component A comprises a diisocyanate or a polyisocyanate, and
the polyol component B comprises an alkoxylation product of a mixture comprising 30-90 wt. % of castor oil or ricinoleic acid (i), an aromatic di- or polyol (ii), and an OH-functional compound having aliphatically bonded OH groups and OH-functionality of from 1 to 8 (iii), and also optionally a compound (iv) that is a cyclic anhydride of a dicarboxylic acid, and optionally a compound (v) that is a cyclic mono- or diester,
wherein wt. % is based on a total weight of components (i) to (iii) and, if present (iv) and (v).

2. The polyurethane adhesive according to claim 1 , wherein said alkoxylation product is achieved with the aid of a nucleophilic and/or basic catalyst and of at least one alkylene oxide.

3. The polyurethane adhesive according to claim 2 , wherein the alkylene oxide comprises propylene oxide.

4. The polyurethane adhesive according to claim 1 , wherein the mixture comprises an aromatic diol comprising two phenol groups.

5. The polyurethane adhesive according to claim 4 , wherein the aromatic diol comprises a bisphenol.

6. The polyurethane adhesive according to claim 1 , wherein the OH-functional compound (iii) has from 5 to 8 OH groups.

7. The polyurethane adhesive according to claim 1 , wherein the isocyanate component A comprises a mixture of monomeric diphenylmethane diisocyanate and of diphenylmethane diisocyanate having a larger number of rings than monomeric diphenylmethane diisocyanate.

8. The polyurethane adhesive according to claim 1 , wherein the OH number of the alkoxylation product is in the range from 80 to 800.

9. The polyurethane adhesive according to claim 1 , wherein the proportion of castor oil or ricinoleic acid (i) is from 30 to 80% by weight, the proportion of an aromatic di- or polyol (ii) is from 4 to 25% by weight, and the proportion of an OH-functional compound having aliphatically bonded OH groups and OH-functionality of from 1 to 8 (iii) is from 10 to 40% by weight, and the proportion of an optional compound (iv) that is a cyclic anhydride of a dicarboxylic acid is from 0 to 30% by weight, and the proportion of an optional compound (v) that is a cyclic mono- or diester is from 0 to 30% by weight, based in each case on the total weight of components (i) to (v).

10. The polyurethane adhesive according to claim 1 , wherein the mixture comprises the compound (iv).

11. The polyurethane adhesive according to claim 1 , wherein the mixture comprises the compound (v).

12. The polyurethane adhesive according to claim 1 , wherein the mixture comprises the compound (iv) and the compound (v).

13. The polyurethane adhesive according to claim 1 , wherein said polyol component B excludes castor oil.

14. A process for adhesive bonding, comprising:
mixing the isocyanate component A and the polyol component B of the polyurethane adhesive according to claim 1 ,
applying the mixed polyurethane adhesive to at least one substrate surface requiring adhesive bonding,
forming a joint within an open time, and
hardening the polyurethane adhesive.

15. The process according to claim 14 , wherein the at least one substrate surface requiring adhesive bonding is a plastic.

16. An adhesive-bonded item obtained by the process according to claim 14 .

17. A wind turbine comprising the adhesive-bonded item according to claim 16 .

Assignees

• Basf Se
• Vasf Se

Inventors

• Eling Berend
• Reese Hans-Juergen
• Koenig Christian
• Bolze Patrick

Classifications

• C09J175/08 Primary

  from polyethers · CPC title

• C09J2475/00

  Presence of polyurethane · CPC title

• C08G18/3206

  aliphatic · CPC title

• C08G18/3215

  containing aromatic groups or benzoquinone groups · CPC title

• C08G18/4891 Primary

  modified with higher fatty oils or their acids or by resin acids · CPC title