Two component (epoxy/amine) structural foam-in-place material

• US 7,473,715 B2
• Filed: 11/10/2004
• Issued: 01/06/2009
• Est. Priority Date: 05/02/2001
• Status: Expired due to Fees

• Current Assignee: Zephyros, Inc.
• Original Assignee: Zephyros, Inc.
• Inventors: Hicks, Kevin, Kosal, David J., Czaplicki, Michael J.
• Primary Examiner(s): ZEMEL, IRINA SOPJIA
• Application Number:
  US10/985,197
• Publication Number:
  US 20050119372A1
• Time in Patent Office: 1,518 Days
• Field of Search: 525/178, 525/135, 525/54, 521/178, 521/135, 521/54, 521/76, 521/83, 521/100
• US Class Current: 521/54
• CPC Class Codes: C08J 2203/22 Expandable microspheres, e.g. Expancel®
• CPC Class Codes: C08J 2363/00 Characterised by the use of epoxy resins; Derivatives of epoxy resins
• CPC Class Codes: C08J 9/32 from compositions containing microballoons, e.g. syntactic foams

Abstract

The present invention relates to methods, materials, and products for forming a foamed product, comprising the steps of combining an epoxy-based component with an amine-based component. The epoxy component is cross-linked through a polymerization reaction catalyzed by the amine formulation. In this regard, an reactive mixture or exothermic reaction is created between the epoxy component and the amine component when combined. The heat generated by the exothermic reaction softens a thermoplastic shell of a blowing agent formulated within the epoxy component thereby enabling a solvent core within the thermoplastic shell of the blowing agent to expand from the heat generated by the exothermic or reactive mixture.

Claims

1. A method for producing a foamed article, comprising the steps of:

providing an epoxy component, said epoxy component including an epoxy resin, a blowing agent having a thermoplastic shell filled with a solvent core;

providing an amine component, said amine component including at least one amine; and

combining said epoxy component and said amine component to form a reactive mixture and allowing said thermoplastic shell filled with a solvent core to soften from amine-epoxy exotherm and then expand due to gas pressure from said solvent core, wherein said reactive mixture cures upon combining said epoxy component with said amine component through a cross-linking of said epoxy resin;

wherein one or both of the epoxy component and the amine component include an ammonium clay; and

wherein the ammonium clay is between about 2% and about 14% by weight of the epoxy component, between 5% and about 25% by weight of the amine component or both.

2. A method as in claim 1, wherein the epoxy resin comprises from about 35% to about 95% of the epoxy component.

3. A method as in claim 1, wherein the epoxy resin and the ammonium clay are combined prior to adding the blowing agent when forming the epoxy component.

4. A method as in claim 1, wherein the ammonium clay includes at least one of smectite, sepiolite or a chloride.

5. A method as in claim 1, wherein the reactive admixture expands greater than 50% of its original unexpanded state to form the foamed article and the foamed article has a compressive modulus greater than about 700 MPa.

6. A method as in claim 1, wherein the reactive mixture includes a aliphatic acrylic ester.

7. A method as in claim 1, wherein the reactive mixture includes a butyl acrylatel methyl methacrylate.

8. A method as in claim 1, wherein the reactive mixture includes an additive selected from glass microspheres or ceramic microspheres.

20. A method as in claim 1, wherein said reactive mixture is formed and said thermoplastic shell filled with said solvent core is allowed to soften from said amine-epoxy exotherm and then expand due to gas pressure from said solvent core, all without adding external heat at room temperature.

21. A method as in claim 20, wherein said epoxy resin has a molecular weight from about 350 to about 600.

22. A method as in claim 21, wherein the amount of ammonium clay comprises from about 2% to about 15% of said epoxy component and the reactive mixture is applied to a structure of an automotive vehicle.

23. A method as in claim 21, wherein the amount of ammonium clay comprises from about 5% to about 25% of said amine component and the reactive mixture is applied to a structure of an automotive vehicle.

9. A method for producing a foamed article, comprising the steps of:

providing an epoxy component, said epoxy component including;

i) an epoxy resin that includes at least one of a bisphenol A epoxy resin, an isopropyl epoxy resin and a polyglycol diglycidyl ether;

ii) a blowing agent having a thermoplastic shell filled with a solvent core;

iii) a butyl acrylate/methyl methacrylate modifier;

iv) an acrylic ester; and

v) an ammonium clay providing an amine component, said amine formulation including;

i) at least one amine selected from a piperazine amine and an amidoamine; and

ii) an ammonium clay;

combining said epoxy component and said amine component to form a reactive mixture and allowing said thermoplastic shell filled with a solvent core to soften from amine-epoxy exotherm and then expand due to gas pressure from said solvent core;

wherein the ammonium clay is between about 2% and about 14% by weight of the epoxy component and between 5% and about 25% by weight of the amine component.

10. A method as in claim 9, wherein the epoxy resin comprises from about 35% to about 95% of the epoxy component.

11. A method as in claim 9, wherein the epoxy resin and the ammonium clay are combined prior to adding the blowing agent when forming the epoxy component.

12. A method as in claim 9, wherein the ammonium clay includes at least one of smectite, sepiolite or a chloride.

13. A method as in claim 9, wherein the foamed article exhibit the reactive admixture expands greater than 50% of its original unexpanded state to form the foamed article and the foamed article has a compressive modulus greater than about 700 MPa.

14. A method as in claim 9, wherein the reactive mixture includes an additive selected from glass microspheres or ceramic microspheres.

15. A method for producing a foamed article, comprising the steps of:

providing an epoxy component, said epoxy component including;

i) an epoxy resin that includes a combination of a bisphenol A epoxy resin, an isopropyl epoxy resin and a polyglycol diglycidyl ether;

ii) a blowing agent having a thermoplastic shell tilled with a solvent core;

iii) a butyl acrylate/methyl methacrylate modifier;

iv) a acrylic ester; and

v) an alkyl quaternary ammonium clay that includes smectite, sepiolite and an ammonium chloride;

providing an amine component, said amine formulation including;

i) at least one amine selected from a piperazine amine and an amidoamine; and

ii) an alkyl quaternary ammonium clay that includes smectite, sepiolite and an ammonium chloride;

combining said epoxy component and said amine component to form a reactive mixture and allowing said thermoplastic shell filled with a solvent core to soften from amine-epoxy exotherm and then expand due to gas pressure from said solvent core;

wherein the ammonium clay is between about 2% and about 14% by weight of the epoxy component and between 5% and about 25% by weight of the amine component.

16. A method as in claim 15, wherein the epoxy resin comprises from about 35% to about 95% of the epoxy component.

17. A method as in claim 15, wherein the epoxy resin and the ammonium clay are combined prior to adding the blowing agent when forming the epoxy component.

18. A method as in claim 15, wherein the reactive admixture expands greater than 50% of its original unexpanded state to form the foamed article and the foamed article has a compressive modulus greater than about 700 MPa.

19. A method as in claim 15, wherein the reactive mixture includes an additive selected from glass microspheres or ceramic microspheres.