Adhesive film for bushings
A bushing can include a load bearing substrate having a first major surface, an adhesive film overlying the first major surface, and a friction reducing layer overlying the adhesive film. A method can include extruding an adhesive film, laminating a friction reducing layer to a load bearing substrate with the adhesive film therebetween to form a composite, and shaping the composite to form a bushing. The adhesive film can include a first adhesive layer, such as and a fluoropolymer layer. The adhesive layer can include a modified ethylene tetrafluoroethylene, and the fluoropolymer layer can include an ethylene tetrafluoroethylene.
1. A bushing comprising:
a load bearing substrate having a first major surface;
an adhesive film overlying the first major surface and comprising a first layer and a second layer, the first layer being an adhesive layer and the second layer being a fluoropolymer layer, wherein the fluoropolymer layer includes a fluoropolymer and the adhesive layer including a modified form of the fluoropolymer, wherein a thickness ratio of the adhesive layer and the fluoropolymer layer is not less than 1:20; and
a friction reducing layer overlying the adhesive film.
2. The bushing of claim 1 , wherein the adhesive layer includes a modified ethylene tetrafluoroethylene.
3. The bushing of claim 2 , wherein the modified ethylene tetrafluoroethylene includes maleic anhydride.
4. The bushing of claim 1 , wherein the fluoropolymer layer includes an ethylene tetrafluoroethylene.
5. The bushing of claim 1 , wherein the load bearing substrate is in direct contact with the adhesive layer.
6. The bushing of claim 1 , wherein the friction reducing layer has a coefficient of friction of not greater than about 0.4.
7. A composite comprising:
a metal substrate having a first major surface; and
an adhesive film overlying the first major surface and comprising a first layer and a second layer, the first layer being a modified ethylene tetrafluoroethylene layer and the second layer being an ethylene tetrafluoroethylene layer, the modified ethylene tetrafluoroethylene layer having a thickness of not greater than about 7.5 microns; and
a friction reducing layer overlying the adhesive layer.
8. The composite of claim 7 , wherein the modified ethylene tetrafluoroethylene includes maleic anhydride.
9. The composite of claim 7 , wherein the adhesive film has a thickness of about 25 microns to about 75 microns.
10. The composite of claim 7 , wherein a thickness ratio of the modified ethylene tetrafluoroethylene layer and the ethylene tetrafluoroethylene layer is not less than 1:20.
11. The composite of claim 10 , wherein the thickness ratio is not greater than 1:2.
12. The composite of claim 7 , wherein the load bearing substrate is in direct contact with the modified ethylene tetrafluoroethylene layer.
13. The composite of claim 7 , wherein the modified ethylene tetrafluoroethylene layer includes a first modified ethylene tetrafluoroethylene layer and a second modified ethylene tetrafluoroethylene layer.
14. The composite of claim 7 , wherein the friction reducing layer has a coefficient of friction of not greater than about 0.4.