DAMPING MATERIAL, METHOD OF FORMING THE DAMPING MATERIAL AND METHOD OF USING THE DAMPING MATERIAL
A damping material is disclosed along with a method of forming and/or using the damping material. The damping material may be used in a variety of applications, however, has been found particularly useful in aerospace applications.
1 . A damping material, comprising:
a layer of damping material, the layer being form of a composition that includes:
i. plasticizer;
ii. co-polymer;
iii. thermoplastic rubber; and
iv. a flame retardant including a borate.
2 . A damping material as in claim 1 wherein the composition further includes a pre-cured rubber in an amount of about 5 to 25 percent by weight of the overall composition.
3 . A damping material as in claim 1 wherein the flame retardant is zinc borate and is present in an amount of about 15 to about 75 percent by weight of the overall composition
4 . A damping material as in claim 1 wherein the composition further includes and effective amount of nano-particles in an amount up to about 10 percent by weight of the overall composition.
5 . A damping material as in claim 1 wherein the co-polymer includes ethylene and acrylate.
6 . A damping material as in claim 1 wherein the co-polymer includes ethylene and vinyl acrylate, butyl acrylate or both.
7 . A damping material as in claim 1 wherein the thermoplastic rubber includes vinyl polyisoprene blocked with polystyrene blocks.
8 . A damping material as in claim 2 wherein the pre-cured rubber is butyl rubber.
9 . (canceled)
10 . A damping material as in claim 1 wherein:
i. the plasticizer includes a paraffin;
ii. the damping material is attached to a metal substrate or a composite substrate or an an adhesive.
11 . A damping material as in claim 1 wherein the layer is adhesively bonded to a fibrous layer.
12 . A damping material as in claim 11 wherein the fibrous layer is in the form of a blanket.
13 . A damping material as in claim 1 wherein the layer of damping material is at least partially impregnated in a porous substrate.
14 . A damping material as in claim 1 wherein the layer of damping material is secured within an aircraft structure.
15 . (canceled)
16 . (canceled)
17 . A damping material as in claim 15 wherein the damping material including the layer of damping material and a fibrous layer are secured within a aircraft structure.
18 . A damping layer, comprising:
a layer of damping material, the layer being form of a composition that includes:
i. plasticizer in an amount of about 5 to about 15 percent by weight of the overall composition;
ii. ethylene co-polymer in an amount of about 5 to 25 percent by weight of the overall composition, the copolymer including ethylene;
iii. thermoplastic rubber in an amount of about 5 to 25 percent by weight of the overall composition, the thermoplastic rubber including vinyl polyisoprene blocked with polystyrene blocks; and
iv. pre-cured rubber in an amount of about 5 to 25 percent by weight of the overall composition, the pre-cured rubber being a butyl rubber;
iii. a zinc borate flame retardant in an amount of about 15 to about 75 percent by weight of the overall composition; and
v. an effective amount of nano-particles in an amount up to about 10 percent by weight of the overall composition, the nano-particles including nanoclay;
a first fibrous layer adhered to a first side of the layer of damping material and a second fibrous layer adhered to a second side of the layer of damping material, the damping layer being adhered to the first and second fibrous layers with a methacrylic adhesive;
wherein the damping layer is secured within an aircraft structure.
19 . A damping layer as in claim 18 wherein the flame retardant includes a mixture of ammonium phosphate and zinc borate, and the weight ratio of the ammonium phosphate and zinc borate is from about 20:1 to about 5:1.
20 . A damping layer as in claim 19 wherein the flame retardant is present in an amount up to about 60 percent by weight of the overall composition, the weight ratio of the ammonium phosphate and zinc borate is about 8:1, the plasticizer is present in an amount of about 8 to 12 percent by weight of the overall composition, the polymer including ethylene is present in an amount of about 10 to 16 percent by weight of the overall composition, the thermoplastic rubber is present in an amount of about 12 to 20 percent by weight of the overall composition; and wherein the pre-cured rubber is present in an amount of about 12 to 20 percent by weight of the overall composition, and the nanoparticle is present in an amount of up to about 3 percent by weight of the overall composition.
21 . A damping layer, consisting essentially of:
a layer of damping material, the layer being form of a composition that includes:
i. plasticizer in an amount of about 5 to about 15 percent by weight of the overall composition;
ii. ethylene co-polymer in an amount of about 5 to 25 percent by weight of the overall composition, the copolymer including ethylene;
iii. thermoplastic rubber in an amount of about 5 to 25 percent by weight of the overall composition, the thermoplastic rubber including vinyl polyisoprene blocked with polystyrene blocks; and
iv. pre-cured rubber in an amount of about 5 to 25 percent by weight of the overall composition, the pre-cured rubber being a butyl rubber;
v. a zinc borate flame retardant in an amount of about 15 to about 75 percent by weight of the overall composition;
vi. an effective amount of nano-particles in an amount up to about 10 percent by weight of the overall composition, the nano-particles including nanoclay;
vii. an ammonium polyphosphate flame retardant;
viii. an ethylene vinyl acetate copolymer; and
a first fibrous layer adhered to a first side of the layer of damping material and a second fibrous layer adhered to a second side of the layer of damping material, the damping layer being adhered to the first and second fibrous layers with a methacrylic adhesive;
wherein the damping layer is secured within an aircraft structure.