Slide bearing comprising a primer system as adhesion promoter
A slide bearing can include a metal support, a primer layer, an adhesive layer applied directly thereto, and a sliding layer applied to the adhesive layer. The primer layer can include an oligomeric condensate of at least one silanol selected from the group having the formula: wherein x is 1 or 2, y is 0 or 1. The moieties R 1 and R 2 can be the same or different. The moieties R 1 and R 2 can be selected from the group consisting of methyl, ethyl, n-propyl, i-propyl, and a functionalized alkyl group R′—(CH 2 ) z —, wherein z is at least 1. Slide bearings comprising a primer system based on silanol oligomeric condensates show improved peel strength than their analogous slide bearings lacking the primer system.
1. A slide bearing comprising,
a metal support;
a primer layer, wherein the primer layer consists of at least one silanol, an oligomeric condensate of at least one silanol, or combination thereof, wherein the at least one silanol is selected from the group having the formula
wherein x is 1 or 2, y is 0 or 1,
wherein R 1 and R 2 are the same or different and are selected from the group consisting of methyl, ethyl, n-propyl, i-propyl, and a functionalized alkyl group R′—(CH 2 ) z , wherein z is at least 1;
an adhesive layer applied directly to the primer layer, wherein the adhesive layer is selected from the group consisting of perfluoroalkoxyethylene (PFA), tetrafluoroethylene-perfluoro(methyl vinyl ether) copolymer (MFA), ethylene tetrafluoroethylene (ETFE), tetrafluoroethylene-hexafluoropropylene (FEP), and any combination thereof; and a sliding layer.
2. The slide bearing according to claim 1 , wherein R′ is selected from the group consisting of vinyl, difluorovinyl, trifluoromethyl, pentafluoroethyl, methoxy, ethoxy, trifluoromethoxy, pentafluoroethoxy, dimethyl amino, diethlyamino, di(trifluoromethyl)amino, and di(pentafluoroethyl)amino.
3. The slide bearing according to claim 1 , wherein two silanols are selected in a weight ratio of at least about 1:1.
4. The slide bearing according to claim 1 , wherein the primer layer has a thickness of at least about 0.2 microns.
5. The slide bearing according to claim 4 , wherein the thickness is not greater than about 5 microns.
6. The slide bearing according to claim 1 , wherein the primer layer and the adhesive layer have a combined thickness of at least about 2 microns.
7. The slide bearing according to claim 1 , wherein the primer layer and the adhesive layer have a combined bonding strength after T-peel force according to DIN EN 1895 of at least about 100 N/cm.
8. The slide bearing to claim 1 , wherein the primer layer, the adhesive layer and the sliding layer have a combined bonding strength after T-peel force according to DIN EN 1895 of at least about 70 N/cm.
9. The slide bearing according to claim 1 , wherein the sliding layer comprises polytetrafluoroethylene, polyamide, polyimide, polyether ether ketone, or a mixture thereof.
10. The slide bearing according to claim 1 , wherein the sliding layer comprises at least one filler.
11. The slide bearing according to claim 10 , wherein the at least one filler comprises fiber, glass fiber, carbon fiber, aramid, inorganic material, ceramic material, carbon, glass, graphite, aluminum oxide, molybdenum sulfide, tungsten disulfide, bronze, silicon carbide, woven fabric, powder, sphere, thermoplastic material, polyimide (PI), polyamidimide (PAI), polyphenylene sulfide (PPS), polyphenylene sulfone (PPSO2), liquid crystal polymer (LCP), polyether ether ketone (PEEK), aromatic polyester (Ekonol), mineral material, wollastonite, barium sulfate, or any combination thereof.
12. The slide bearing according to claim 1 , wherein the metal support comprises steel, cold-rolled steel, material No. 1.0338 or 1.0347, matt zinc-plated steel, stainless steel, material No. 1.4512 or 1.4720, aluminum, bronze, alloys, or any combination thereof.