Thermally expandable preparations

Patent metadata

Field	Value
Publication number	US-9790341-B2
Application number	US-201414491034-A
Country	US
Kind code	B2
Filing date	Sep 19, 2014
Priority date	Mar 29, 2012
Publication date	Oct 17, 2017
Grant date	Oct 17, 2017

Abstract

The subject matter of the present application is a thermally expandable preparation that can be pumped at application temperatures below 70° C., containing (a) at least one first epoxy resin E1 that has an epoxy equivalent weight of at most 280 g/eq and a viscosity of at most 1250 Pa*s at 25° C., (b) at least one second epoxy resin E2 that has an epoxy equivalent weight of at least 300 g/eq and a viscosity of at most 250 Pa*s at 25° C., (c) at least one hardener that can be thermally activated, (d) at least one propellant that can be thermally activated, and (e) at least 1 wt. % of organic fibres having a fibre length of 0.2 mm to 10 mm.

First claim

The invention claimed is:

1. A thermally expandable preparation pumpable at application temperatures below 70° C., comprising
(a) at least one first epoxy resin E1 that has an epoxy equivalent weight of at most 280 g/eq and a viscosity at 25° C. of at most 1250 Pa*s,
(b) at least one second epoxy resin E2 that has an epoxy equivalent weight of at least 300 g/eq and a viscosity at 25° C. of at most 250 Pa*s,
(c) at least one thermally activatable hardener,
(d) at least one thermally activatable blowing agent,
(e) at least 1 wt. % organic fibers having a fiber length from 0.2 mm to 10 mm, and
(f) at least 20 wt. % fillers.

2. The preparation according to claim 1 , characterized in that it contains at least 30 wt. % fillers, based in each case on the total application preparation.

3. The preparation according to claim 1 , characterized in that the at least one filler is a lightweight filler.

4. The preparation according to claim 1 , characterized in that the at least one filler is an inorganic filler.

5. The preparation according to claim 1 , characterized in that the at least one filler is surface-treated silicon dioxide.

6. The preparation according to claim 1 , characterized in that it contains less than 1.5 wt. %, based on the total application preparation, of an epoxy resin that is solid at 25° C.

7. The preparation according to claim 1 , characterized in that the first epoxy resin E1
has an epoxy equivalent weight of at most 200 g/eq, and/or
has a viscosity at 25° C. of at most 20 Pa*s, and/or
is contained in the preparation in a quantity from 10 to 55 wt. %, based on the total application preparation.

8. The preparation according to claim 1 , characterized in that the second epoxy resin E2
has an epoxy equivalent weight of at least 400 g/eq, and/or
has a viscosity at 25° C. of at most 200 Pa*s, and/or
is contained in the preparation in a quantity from 5 to 35 wt. %, based on the total application preparation.

9. The preparation according to claim 1 , characterized in that it contains at least one impact modifier and/or at least one flame retardant.

10. A method for stiffening and/or reinforcing components having thin-walled structures, in particular tubular structures, characterized in that a thermally expandable preparation pumpable at application temperatures below 70° C. according to one of claims 1 to 9 is applied at a temperature below 70° C., at a pump pressure of less than 200 bar, onto the surface of the structure to be reinforced, and said preparation is cured at a later point in time at temperatures above 130° C.

11. A component having a thin-walled structure, which component has been stiffened and/or reinforced with a thermally expandable preparation pumbable at application temperatures below 70° C. according to one of claims 1 to 9 , in the cured state.

12. The preparation according to claim 1 , characterized in that the filler is hollow glass spheres.

13. The preparation according to claim 1 , characterized in that the filler is chalk.

Assignees

• Henkel Ag & Co Kgaa

Inventors

• Barriau Emilie
• Renkel Martin
• Schoenfeld Rainer
• Wucherpfennig Sven
• Welters Tim

Classifications

• C08J9/0085 Primary

  Use of fibrous compounding ingredients (C08J9/0076 takes precedence) · CPC title

• C08K7/02

  Fibres or whiskers · CPC title

• C08J9/0061

  characterized by the use of several polymeric components · CPC title

• C08J2463/00

  Characterised by the use of epoxy resins; Derivatives of epoxy resins · CPC title

• C08J2363/00

  Characterised by the use of epoxy resins; Derivatives of epoxy resins · CPC title