SELF-HEALING ELASTOMER SYSTEM

• US 20090247694A1
• Filed: 03/27/2009
• Published: 10/01/2009
• Est. Priority Date: 03/28/2008
• Status: Abandoned Application

• Current Assignee: Carl Freudenberg KG
• Original Assignee: Carl Freudenberg KG
• Inventors: Traber, Boris, Kritzer, Peter
• Application Number:
  US12/412,925
• Publication Number:
  US 20090247694A1
• Time in Patent Office: Days
• US Class Current: 524/556
• CPC Class Codes: B29C 73/163 Sealing compositions or agents, e.g. combined with propellant agents
• CPC Class Codes: B29C 73/22 the article containing elements including a sealing composition, e.g. powder being liberated when the article is damaged
• CPC Class Codes: C08K 3/013 Fillers, pigments or reinforcing additives
• CPC Class Codes: C08L 13/00 Compositions of rubbers containing carboxyl groups
• CPC Class Codes: C08L 19/006 Rubber characterised by functional groups, e.g. telechelic diene polymers
• CPC Class Codes: C08L 2666/08 Homopolymers or copolymers according to C08L7/00 - C08L21/00; Derivatives thereof

Abstract

A self-healing elastomer system is provided. The system includes an elastomer that has a surface and a core. The elastomer has an elastomer matrix. The elastomer matrix has first functional groups covalently bonded in the interior. A liquid phase borders on the surface of the elastomer. The liquid phase contains an additive. The first functional groups and the additive are chosen so that, in the case of damage to the elastomer, the first functional groups that come into contact with the liquid phase enter into a reaction. The invention also concerns methods for producing and using the self-healing elastomer system and suitable elastomers.

Claims

1. A self-healing elastomer system comprising:

an elastomer having a surface and a core, the elastomer having an elastomer matrix, wherein the elastomer matrix has first functional groups covalently bonded in the interior, and

a liquid phase that borders on the surface of the elastomer, the liquid phase containing an additive, wherein the first functional groups and the additive are chosen so that, in the case of damage to the elastomer, the first functional groups that come into contact with the liquid phase enter into a reaction.

2. An elastomer system as in claim 1, wherein the elastomer is stabilized by the reaction.

3. An elastomer system as in claim 1, wherein the system contains second functional groups that can react with the first functional groups, where the second functional groups are components of the elastomer matrix, are attached to it, are embedded in the matrix in a noncovalently bonded form and/or are components of the additive.

4. An elastomer system as in claim 1, wherein the system contains a catalyst, a reaction accelerator and/or a reaction initiator.

5. An elastomer system as in claim 1, wherein the additive has second functional groups, wherein the reaction of the first functional groups of the elastomer matrix takes place with the second functional groups of the additive.

6. An elastomer system as in claim 1, wherein the reaction of the first functional groups takes place with each other.

7. An elastomer system as in claim 1, wherein the elastomer system has second functional groups that are covalently bonded to the elastomer matrix, wherein the reaction of the first functional groups of the elastomer matrix takes place with the second functional groups.

8. An elastomer system as claim 1, wherein coagents that are not covalently bonded with the matrix and that have second functional groups are contained in the elastomer matrix, wherein the reaction of the first functional groups of the elastomer matrix takes place with the second functional groups of the coagents.

9. An elastomer system as in claim 1, wherein the reaction is the formation of covalent bonds or the formation of noncovalent interaction chosen from van der Waals, magnetic, electrostatic, ionic, hydrophobic, dipolar or other interactions.

10. An elastomer system as in claim 1, wherein the reaction is a cross-linking reaction.

11. An elastomer system as in claim 10, wherein the cross-linkable groups are chosen from vinyl, diene, amine, alkoxysiloxane, carboxyl, hydroxy, urethane, isocyanate, siloxane, ester, amide and thiol groups.

12. An elastomer system as in claim 1, wherein the additive consists of particles that contain second functional groups on the surface.

13. An elastomer system as in claim 1, wherein the functional groups and the additive are each magnetic and/or ionic and have an affinity for each other.

14. An elastomer system as in claim 1, further including a separating layer that is arranged between the elastomer matrix and the liquid phase.

15. An elastomer system as in claim 1, wherein the elastomer is configured as a seal, membrane, bladder, molded part, rubber-metal part, liner or hydromount.

16. A method for using the elastomer system of claim 1 to heal damage to elastomers.

17. An elastomer comprising:

a surface and a core,

an elastomer matrix having first functional groups covalently bonded in the interior with substantially no covalently bonded first functional groups on the surface, wherein;

(a) the elastomer matrix has second functional groups which are components of the elastomer matrix or are attached to it, and/or

(b) coagents that are not covalently bonded and that have second functional groups, catalysts, reaction initiators, reaction accelerators and/or cross-linking agents are contained in the elastomer matrix,

wherein the second functional groups, catalysts, reaction initiators, reaction accelerators and/or cross-linking agents are chosen so that they enter into or catalyze or initiate a reaction with the first functional groups if an additional component penetrates into the elastomer.

18. An elastomer as in claim 17, wherein the first functional groups are carboxyl groups and a catalyst for an esterification is contained in the elastomer matrix.

19. An elastomer as in claim 17, further including a separating layer.

20. An elastomer system as in claim 17, wherein the elastomer is configured as a seal, membrane, bladder, molded part, rubber-metal part, liner or hydromount.

21. A method for using the elastomer of claim 17 to heal damage to elastomers.

22. A method for producing a self-healing elastomer system comprising the steps of:

providing an elastomer that has a surface and a core, the elastomer having an elastomer matrix, the elastomer matrix having covalently bonded first functional groups in its interior, and

adding a liquid phase that borders on the surface of the elastomer, wherein the liquid phase contains an additive, the first functional groups and the additive being chosen so that, in the case of damage of the elastomer, first functional groups that come into contact with the liquid phase enter into a reaction.