# US 10,871,190 B2 · Sliding bearing and a method for preparing the same

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 10,871,190 B2
- Document ID: US10871190B2
- Status: Granted
- Kind: B2
- Application number: 16/505,946
- Filed: 2019-07-09
- Published: 2020-06-25
- Granted: 2020-12-22
- Earliest claimed: 2018-12-25
- Assignees: Cob Precision Parts Inc.
- Applicants: Cob Precision Parts Inc.
- Inventors: Guoqiang Zhang
- Web page: https://patentgrep.com/patent/US10871190B2

## CPC

- F16C 33/206: {with three layers}
- B32B 7/12: using interposed adhesives or interposed materials with bonding properties
- B32B 15/085: comprising polyolefins
- B32B 15/18: comprising iron or steel {(B32B15/011, B32B15/012 and B32B15/013 take precedence)}
- B32B 27/16: specially treated, e.g. irradiated
- B32B 27/18: characterised by the use of special additives
- B32B 27/20: using fillers, pigments, thixotroping agents
- B32B 27/286: {comprising polysulphones; polysulfides}
- B32B 27/306: {comprising vinyl acetate or vinyl alcohol (co)polymers}
- B32B 27/32: comprising polyolefins {(comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30)}
- B32B 27/322: {comprising halogenated polyolefins, e.g. PTFE}
- B32B 27/34: comprising polyamides
- B32B 27/36: comprising polyesters
- B32B 27/40: comprising polyurethanes
- F16C 33/201: {Composition of the plastic}
- F16C 33/203: {Multilayer structures, e.g. sleeves comprising a plastic lining}
- F16C 33/205: {with two layers}
- F16C 33/208: {Methods of manufacture, e.g. shaping, applying coatings}
- B32B 2255/10: on synthetic resin layer or on natural or synthetic rubber layer
- B32B 2262/0269: Aromatic polyamide fibres
- B32B 2262/101: Glass fibres
- B32B 2262/106: Carbon fibres, e.g. graphite fibres
- B32B 2264/10: Inorganic particles
- B32B 2264/101: Glass
- B32B 2264/102: Oxide or hydroxide
- B32B 2264/104: Oxysalt, e.g. carbonate, sulfate, phosphate or nitrate particles
- B32B 2264/105: Metal
- B32B 2264/108: Carbon, e.g. graphite particles
- B32B 2307/538: Roughness
- B32B 2307/734: Dimensional stability
- B32B 2307/748: Releasability
- B32B 2475/00: Frictional elements
- F16C 2208/04: Glass fibres
- F16C 2208/32: Polytetrafluorethylene [PTFE] (F16C2208/58 takes precedence)
- F16C 2208/60: Polyamides [PA]
- F16C: SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM

## Abstract

A sliding bearing includes a backing layer, a bonding layer with at least one fluorination-treated surface, and a sliding layer. A method for preparing the sliding bearing includes performing a fluorination treatment on a surface of the bonding layer, placing a surface of the bonding layer on a surface of the backing layer, and placing a surface of the sliding layer on a surface of the bonding layer to form a laminated assembly, heating and pressurizing the laminated assembly, and cooling the laminated assembly in a pressurized state.

## Claims

### Claim 1

A sliding bearing comprising:
a backing layer comprising a first surface and a second surface on the back of the first surface;
a bonding layer covering the backing layer and comprising a first bonding surface in contact with the second surface of the backing layer and a second bonding surface on the back of the first bonding surface; and
a sliding layer covering the bonding layer and comprising a first surface in contact with the second bonding surface of the bonding layer and a second surface on the back of the first surface of the sliding layer;
wherein the bonding layer comprises a fluorine-free thermoplastic resin and a fluorination-treated layer formed by subjecting the resin to a fluorination treatment on at least the second bonding surface; and
the sliding layer comprises polytetrafluoroethylene.

### Claim 2 (depends on 1)

The sliding bearing according to claim 1, wherein the bonding layer further comprises another fluorination-treated layer formed by subjecting the resin to a fluorination treatment on the first bonding surface.

### Claim 3 (depends on 1)

The sliding bearing according to claim 1, wherein the fluorination-treated layer has a depth of 0.001˜50 μm.

### Claim 4 (depends on 3)

The sliding bearing according to claim 3, wherein the fluorination-treated layer has a depth of 0.1˜15 μm.

### Claim 5 (depends on 1)

The sliding bearing according to claim 1, wherein the fluorine in the fluorination-treated layer has a relative atomic concentration of 1˜80%, and the concentration of the fluorine is obtained through analysis by an X-ray photoelectron spectrometer.

### Claim 6 (depends on 5)

The sliding bearing according to claim 5, wherein the fluorine has a relative atomic concentration of 5˜52%.

### Claim 7 (depends on 1)

The sliding bearing according to claim 1, wherein the thermoplastic resin has a melting point of 330° C. or lower.

### Claim 8 (depends on 1)

The sliding bearing according to claim 1, wherein the thermoplastic resin is selected from one or more of polyethylene, polypropylene, ethylene-vinyl acetate copolymer, polyurethane, polyamide, polyethylene terephthalate, polybutylene terephthalate, and polyphenylene sulfide.

### Claim 9 (depends on 8)

The sliding bearing according to claim 8, wherein the thermoplastic resin is selected from one or more of ethylene-vinyl acetate copolymer, polyurethane, polyamide, and polyphenylene sulfide.

### Claim 10 (depends on 1)

The sliding bearing according to claim 1, wherein a mass fraction of the thermoplastic resin in the bonding layer is 40˜100%.

### Claim 11 (depends on 1)

The sliding bearing according to claim 1, wherein the bonding layer further comprises:
a filler for the bonding layer selected from a graft modified polymer, inorganic powder or a combination thereof;
wherein the graft modified polymer is selected from one or more of anhydride grafted polyethylene, anhydride grafted polypropylene, and acrylate grafted polypropylene; and
the inorganic powder is selected from one or more of graphite, graphene, carbon nano tube, and silicon dioxide.

### Claim 12 (depends on 1)

The sliding bearing according to claim 1, wherein the bonding layer has a thickness of 0.005˜0.1 mm.

### Claim 13 (depends on 12)

The sliding bearing according to claim 12, wherein the bonding layer has a thickness of 0.02˜0.06 mm.

### Claim 14 (depends on 1)

The sliding bearing according to claim 1, wherein a mass fraction of the polytetrafluoroethylene in the sliding layer is 20˜100%.

### Claim 15 (depends on 14)

The sliding bearing according to claim 14, wherein the mass fraction of the polytetrafluoroethylene in the sliding layer is 60˜90%.

### Claim 16 (depends on 1)

The sliding bearing according to claim 1, wherein the sliding layer further comprises a filler for the sliding layer selected from solid lubricants, abrasion resistance improvers, reinforcements, polymers or a mixture thereof;
wherein the solid lubricants are selected from one or more of graphite, graphite fluoride, graphene, carbon nano tube, molybdenum disulfide, and tungsten disulfide;
the abrasion resistance improvers are selected from one or more of copper, plumbum, copper sulfide, zinc sulfide, barium sulfate, ferric sulfide, chromium oxide, aluminum oxide, zirconium oxide, silicon carbide, silicon nitride, boron nitride, and glass beads;
the reinforcements are selected from one or more of glass fibers, carbon fibers, aramid fibers, polyether-ether-ketone fibers, and polyimide fibers; and
the polymers are selected from one or more of polyamide, polyphenyl ester, polyphenylene sulfide, polyether ether ketone, polyimide, polyamide-imide, polyvinylidene fluoride, ethylene-tetrafluoroethylene copolymer, fluorinated ethylene-propylene copolymer, and tetrafluoroethylene-perfluoalkoxyvinyl ether copolymer.

### Claim 17 (depends on 1)

The sliding bearing according to claim 1, wherein the first surface of the sliding layer is a surface subject to surface treatment.

### Claim 18 (depends on 17)

The sliding bearing according to claim 17, wherein the surface treatment includes chemical modification treatment, plasma treatment, corona treatment, flame treatment, and laser radiation treatment.

### Claim 19 (depends on 1)

A method for preparing the sliding bearing according to claim 1, the method comprising:
performing the fluorination treatment on at least the second bonding surface of the bonding layer;
placing the first bonding surface of the bonding layer on the second surface of the backing layer and then placing the first surface of the sliding layer on the second bonding surface of the bonding layer to form a laminated assembly;
heating and pressurizing the laminated assembly; and
cooling the laminated assembly in a pressurized state.