Sheet molding compound damper component, and methods for making and using the same

• US 7,172,800 B2
• Filed: 11/03/2003
• Issued: 02/06/2007
• Est. Priority Date: 11/03/2003
• Status: Expired due to Fees

• Current Assignee: Material Sciences Corporation (New Star Metals Holdings LLC)
• Original Assignee: Material Sciences Corporation (New Star Metals Holdings LLC)
• Inventors: Boss, Daniel
• Primary Examiner(s): Chen; Vivian
• Application Number:
  US10/698,938
• Publication Number:
  US 20050095392A1
• Time in Patent Office: 1,191 Days
• Field of Search: None
• US Class Current: 428/68
• CPC Class Codes: B32B 2262/101 Glass fibres
• CPC Class Codes: B32B 2307/542 Shear strength
• CPC Class Codes: B32B 25/08 of synthetic resin
• CPC Class Codes: B32B 27/08 of synthetic resin
• CPC Class Codes: B32B 27/20 using fillers, pigments, thixotroping agents
• CPC Class Codes: B32B 7/022 Mechanical properties
• CPC Class Codes: Y10T 428/16 Two dimensionally sectional layer
• CPC Class Codes: Y10T 428/163 Next to unitary web or sheet of equal or greater extent
• CPC Class Codes: Y10T 428/23 Sheet including cover or casing
• CPC Class Codes: Y10T 428/239 Complete cover or casing
• CPC Class Codes: Y10T 428/24802 Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]
• CPC Class Codes: Y10T 428/24942 including components having same physical characteristic in differing degree
• CPC Class Codes: Y10T 428/249946 Glass fiber
• CPC Class Codes: Y10T 428/25 Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
• CPC Class Codes: Y10T 428/252 Glass or ceramic [i.e., fired or glazed clay, cement, etc.] [porcelain, quartz, etc.]
• CPC Class Codes: Y10T 428/254 Polymeric or resinous material
• CPC Class Codes: Y10T 428/257 Iron oxide or aluminum oxide
• CPC Class Codes: Y10T 428/259 Silicic material
• CPC Class Codes: Y10T 428/3154 Of fluorinated addition polymer from unsaturated monomers
• CPC Class Codes: Y10T 428/31544 Addition polymer is perhalogenated
• CPC Class Codes: Y10T 428/31786 : Of polyester [e.g., alkyd, etc.]
• CPC Class Codes: Y10T 428/31794 : Of cross-linked polyester
• CPC Class Codes: Y10T 428/31797 : Next to addition polymer from unsaturated monomers
• CPC Class Codes: Y10T 428/31928 : Ester, halide or nitrile of addition polymer
• CPC Class Codes: Y10T 428/31931 : Polyene monomer-containing
• CPC Class Codes: Y10T 428/31935 : Ester, halide or nitrile of addition polymer

Abstract

A damper component for absorbing and dissipating vibration and/or noise resonating from a device is provided. The damper component includes a viscoelastic damper layer, and a continuous constraining layer intimately contacting and encasing the damper layer. The constraining layer has a greater stiffness and higher modulus of dynamic shearing elasticity than the damper layer. The constraining layer is a molded sheet molding compound that is substantially immiscible with the viscoelastomer to provide a discrete interface between the constraining layer and the damper layer.

Claims

1. A damper component for absorbing and dissipating vibration and/or noise resonation, the damper component comprising:

a damper layer having opposite surfaces and edges, the damper layer comprising a viscoelastomer; and

a continuous constraining layer contacting the opposite surfaces and the edges of the damper layer to completely encase the damper layer, the constraining layer having a greater stiffness and higher modulus of dynamic shearing elasticity than the damper layer, the constraining layer comprising a molded polyester sheet molding compound that is substantially immiscible with the viscoelastomer to provide a discrete interface between the constraining layer and the damper layer.

2. A damper component according to claim 1, wherein the viscoelastomer comprises a polymeric reaction product of a composition comprising a member selected from the group consisting of (meth)acrylic acid and (meth)acrylate.

3. A damper component according to claim 1, wherein the viscoelastomer comprises a polyacrylate.

4. A damper component according to claim 1, wherein the viscoelastomer comprises a member selected from the group consisting of nitrile rubbers and fluoroelastomers.

5. A damper component according to claim 1, wherein the damper layer is free of fillers.

6. A damper component according to claim 1, wherein the continuous constraining layer further comprises high density filler comprising a member selected from the group consisting of glass, carbon, aramids, metal, plastics, alumina, silica, silicon, ceramic, and graphite.

7. A damper component according to claim 1, wherein the continuous constraining layer further comprises chopped fiberglass.

8. A damper component according to claim 1, wherein the modulus of dynamic shearing elasticity of the continuous constraining layer is at least two orders of magnitude greater than that of the viscoelastomer.

9. A damper component according to claim 1, wherein the modulus of dynamic shearing elasticity of the continuous constraining layer is at least three orders of magnitude greater than that of the viscoelastomer.

10. A damper component according to claim 1, wherein the modulus of dynamic shearing elasticity of the continuous constraining layer is at least about 500,000 psi.

11. A damper component according to claim 1, wherein the damper layer has a thickness in a range of 2.54 microns to 254 microns.

12. A damper component according to claim 1, wherein the continuous constraining layer comprises first and second sheets contacting the opposite surfaces, respectively, and consolidated with one another.

13. A damper component for absorbing and dissipating vibration and/or noise resonation, the damper component comprising:

first and second damper layers each having opposite first and second surfaces and edges, each of the damper layers comprising a viscoelastomer; and

a continuous constraining layer contacting the opposite surfaces and the edges of the damper layers to completely encase the damper layers, the constraining layer having a greater stiffness and higher modulus of dynamic shearing elasticity than the damper layers, the constraining layer comprising a molded polyester sheet molding compound that is substantially immiscible with the viscoelastomer to provide a discrete interface between the constraining layer and the damper layers.

14. A damper component according to claim 13, wherein the viscoelastomer comprises a polymeric reaction product of a composition comprising a member selected from the group consisting of (meth)acrylic acid and (meth)acrylate.

15. A damper component according to claim 13, wherein the viscoelastomer comprises a polyacrylate.

16. A damper component according to claim 13, wherein the viscoelastomer comprises a member selected from the group consisting of nitrile rubbers and fluoroelastomers.

17. A damper component according to claim 13, wherein the damper layers are free of fillers.

18. A damper component according to claim 13, wherein the continuous constraining layer further comprises high density filler comprising a member selected from the group consisting of glass, carbon, aramids, metal, plastics, alumina, silica, silicon, ceramic, and graphite.

19. A damper component according to claim 13, wherein the continuous constraining layer further comprises chopped fiberglass.

20. A damper component according to claim 13, wherein the modulus of dynamic shearing elasticity of the continuous constraining layer is at least two orders of magnitude greater than that of the viscoelastomer.

21. A damper component according to claim 13, wherein the modulus of dynamic shearing elasticity of the continuous constraining layer is at least three orders of magnitude greater than that of the viscoelastomer.

22. A damper component according to claim 13, wherein the modulus of dynamic shearing elasticity of the continuous constraining layer is at least about 500,000 psi.

23. A damper component according to claim 13, wherein the damper layers each have a thickness in a range of 2.54 microns to 254 microns.

24. A damper component according to claim 13, wherein the continuous constraining layer comprises:

a first sheet contacting a first surface of the first damper layer;

a second sheet contacting a first surface of the second damper layer; and

a third sheet contacting a second surface of the first damper layer and further contacting a second surface of the second damper layer, wherein the first and third sheets are consolidated with one another to completely encase the first damper layer, and wherein the second and third sheets are consolidated with one another to completely encase the second damper layer.