# US 12,180,355 B2 · Rubber composition, processing method thereof, and braking-resistant liquid product using the same

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- Number: US 12,180,355 B2
- Document ID: US12180355B2
- Status: Granted
- Kind: B2
- Application number: 16/477,519
- Filed: 2018-01-12
- Published: 2020-10-22
- Granted: 2024-12-31
- Earliest claimed: 2017-01-13
- Assignees: Hangzhou Xinglu Technologies Co., Ltd; Shaoxing Pinghe New Material Technology Co., Ltd.
- Applicants: Hangzhou Xinglu Technologies Co., Ltd
- Inventors: Tao Xu; Zhi Sheng Fu; An Yang Wu
- Web page: https://patentgrep.com/patent/US12180355B2

## CPC

- C08L 23/16: Ethylene-propylene or ethylene-propylene-diene copolymers
- B60T 17/04: Arrangements of piping, valves in the piping, e.g. cut-off valves, couplings or air hoses (traction couplings involving joints for supply lines, electric circuits, or the like B60D1/62; couplings peculiar to railway vehicles for, or combined with, couplings or connectors for fluid conduits or electric cables B61G5/06; pipes, cut-off valves, couplings, air hoses per se F16C, F16K, F16L)
- C08K 3/04: Carbon
- C08K 3/22: of metals
- C08K 3/26: Carbonates; Bicarbonates
- C08K 3/346: {Clay}
- C08K 5/0025: {Crosslinking or vulcanising agents; including accelerators}
- C08K 5/09: Carboxylic acids; Metal salts thereof; Anhydrides thereof
- C08K 5/14: Peroxides
- C08L 23/06: Polyethylene
- F16L 11/08: with reinforcements embedded in the wall (F16L11/11 takes precedence)
- C08K 2003/2296: {of zinc}
- C08K 2003/265: {Calcium, strontium or barium carbonate}
- C08L 23/22: Copolymers of isobutene; Butyl rubber; Homopolymers or copolymers of other iso-olefins
- C08L 71/00: Compositions of polyethers obtained by reactions forming an ether link in the main chain (of polyacetals C08L59/00; of epoxy resins C08L63/00; of polythioether-ethers C08L81/02; of polyether-sulfones C08L81/06); Compositions of derivatives of such polymers
- C08L 2205/02: containing two or more polymers of the same C08L -group
- C08L 2205/03: containing three or more polymers in a blend
- C08L 2312/00: Crosslinking
- F16L 11/04: made of rubber or flexible plastics
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- B60T: VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL (electrodynamic brake systems for vehicle, in general B60L; brakes per se, i.e. devices where braking effect occurs, including ultimate brake actuators, F16D); ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)
- F16L: PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL

## Abstract

The present invention discloses a rubber composition, a processing method thereof, and also a brake fluid-resistant product using the rubber composition and a production method thereof. The rubber composition comprises, in parts by weight, 100 parts of a rubber matrix; 1.5-8 parts of a crosslinking agent 40-140 parts of a reinforcing filler; and 0-40 parts of a plasticizer, wherein the rubber matrix comprises, based on 100 parts by weight of the rubber matrix, a branched polyethylene with a content represented as A, in which 0<A≤100 parts; an EPM with a content represented as B, in which 0≤B<100 parts; and an EPDM with a content represented as C, in which 0≤C<100 parts. The rubber composition is useful in the production of brake fluid-resistant brake rubber hose and brake rubber diaphragm. The beneficial effect is that since the rubber composition comprises the branched polyethylene, the tear strength of the rubber compound is improved, thereby reducing the probability of tearing of the product during the production process and improving the overall processing performance.

## Claims

### Claim 1

A brake rubber hose, comprising an inner rubber layer, a middle rubber layer, and an outer rubber layer, wherein, the at least one of the inner rubber layer, the middle rubber layer, and the outer rubber layer comprises a rubber compound formed from a rubber composition comprising a rubber matrix and essential components, wherein the rubber matrix comprises, based on 100 parts by weight of the rubber matrix,
a branched polyethylene with a content represented as A, in which 0<A≤100 parts,
an EPM with a content represented as B, in which 0≤B<100 parts, and
an EPDM with a content represented as C, in which 0≤C<100 parts;
and based on 100 parts by weight of the rubber matrix, the essential components comprise 1.5 to 8 parts of a crosslinking agent, 40 to 140 parts of a reinforcing filler, and 0-40 parts of a plasticizer;
wherein the branched polyethylene is an ethylene homopolymer having a branching degree of from about 60 to 99 branches/1000 carbon atoms, a weight average molecular weight of from 66,000 to 518,000, and a Mooney viscosity ML (1+4) at 125° C. of from 6 to 102.

### Claim 2 (depends on 1)

The brake rubber hose according to claim 1, wherein the ethylene homopolymer has a branching degree of from 60 to 90 branches/1000 carbon atoms.

### Claim 3 (depends on 1)

The brake rubber hose according to claim 1, wherein the ethylene homopolymer has a branching degree of from 60 to 82 branches/1000 carbon atoms.

### Claim 4 (depends on 1)

The brake rubber hose according to claim 1, wherein the ethylene homopolymer has a branching degree of from 60 to 70 branches/1000 carbon atoms.

### Claim 5 (depends on 1)

The brake rubber hose according to claim 1, wherein the ethylene homopolymer has a branching degree of 60 branches/1000 carbon atoms, 70 branches/1000 carbon atoms, 82 branches/1000 carbon atoms, 90 branches/1000 carbon atoms, or 99 branches/1000 carbon atoms.

### Claim 6 (depends on 1)

The brake rubber hose according to claim 1, wherein the ethylene homopolymer has a branching degree of about 60 branches/1000 carbon atoms, about 70 branches/1000 carbon atoms, about 82 branches/1000 carbon atoms, about 90 branches/1000 carbon atoms, or 99 branches/1000 carbon atoms.

### Claim 7 (depends on 1)

The brake rubber hose according to claim 1, wherein if the content of the branched polyethylene in the rubber matrix is more than 90 parts, based on 100 parts by weight of the rubber matrix, the rubber composition comprises 6-40 parts of the plasticizer.

### Claim 8 (depends on 7)

The brake rubber hose according to claim 7, wherein, if the content of the branched polyethylene in the rubber matrix is more than 90 parts, based on 100 parts by weight of the rubber matrix, the rubber composition comprises 10-30 parts of the plasticizer.

### Claim 9 (depends on 1)

The brake rubber hose according to claim 1, wherein, the crosslinking agent comprises at least one of a peroxide crosslinking agent and sulfur, wherein, the peroxide crosslinking agent comprises at least one of di-tert-butyl peroxide, dicumyl peroxide, tert-butyl cumyl peroxide, 1,1-di-tert-butyl peroxide-3,3,5-trimethylcyclohexane, 2,5-dimethyl-2,5-di(tert-butylperoxy) hexane, 2,5-dimethyl-2,5-di(tert-butylperoxy) hexyne-3, bis(tert-butylperoxyisopropyl)benzene, 2,5-dimethyl-2,5-bis(benzoylperoxy) hexane, tert-butyl peroxybenzoate, and tert-butylperoxy-2-ethylhexyl carbonate.

### Claim 10 (depends on 1)

The brake rubber hose according to claim 1, wherein, the plasticizer comprises at least one of a paraffin oil, liquid ethylene-propylene rubber, liquid polyisobutene, and liquid 1,2-polybutadiene.

### Claim 11 (depends on 1)

The brake rubber hose according to claim 1, wherein, the reinforcing filler comprises at least one of carbon black N330, carbon black N550, carbon black N774, calcium carbonate, and talc.

### Claim 12

A brake rubber diaphragm comprising a rubber compound formed from a rubber composition comprising a rubber matrix and essential components, wherein the rubber matrix comprises, based on 100 parts by weight of the rubber matrix,
a branched polyethylene with a content represented as A, in which 0<A<100 parts,
an EPM with a content represented as B, in which 0<B<100 parts, and
an EPDM with a content represented as C, in which 0<C<100 parts;
and based on 100 parts by weight of the rubber matrix, the essential components comprise 1.5 to 8 parts of a crosslinking agent, 40 to 140 parts of a reinforcing filler, and 0-40 parts of a plasticizer;
wherein the branched polyethylene is an ethylene homopolymer having a branching degree of from about 60 to 99 branches/1000 carbon atoms, a weight average molecular weight of from 66,000 to 518,000, and a Mooney viscosity ML (1+4) at 125° C. of from 6 to 102.

### Claim 13 (depends on 12)

The brake rubber diaphragm according to claim 12, wherein, the rubber composition further comprises auxiliary components, which comprise, based on 100 parts by weight of the rubber matrix, 0.2 to 10 parts of an auxiliary crosslinking agent, 3 to 15 parts of a metal oxide, 1 to 3 parts of a stabilizer, 0.5 to 2 parts of stearic acid, 0.5 to 5 parts of polyethylene glycol, and 0 to 3 parts of a vulcanization accelerator, wherein,
the stabilizer comprises at least one of 2,2,4-trimethyl-1,2-dihydroquinoline polymer (RD), 6-ethoxy-2,2,4-trimethyl-1,2-dihydroquinoline (AW), and 2-mercaptobenzimidazole (MB);
the polyethylene glycol comprises at least one of those polyethylene glycol having a molecular weight of 2000, 3400, and 4000;
the auxiliary crosslinking agent comprises at least one of triallyl cyanurate, triallyl isocyanurate, ethylene glycol dimethacrylate, triethylene glycol dimethacrylate, triallyl trimellitate, trimethylolpropane trimethacrylate, N,N′-m-phenylene bismaleimide, N,N′-bis(furfurylidene) acetone, 1,2-polybutadiene, a metal salt of an unsaturated carboxylic acid, and sulfur;
the metal oxide comprises at least one of zinc oxide and magnesia; and
the vulcanization accelerator comprises at least one of 2-mercaptobenzothiazole, dibenzothiazyl disulfide, tetramethyl thiuram monosulfide, tetramethyl thiuram disulfide, tetraethyl thiuram disulfide, N-cyclohexyl-2-benzothiazole sulfenamide, N,N-dicyclohexyl-2-benzothiazole sulfenamide, bismaleimide, and ethylene thiourea.

### Claim 14 (depends on 12)

The brake rubber diaphragm according to claim 12, wherein, the crosslinking agent comprises at least one of a peroxide crosslinking agent and sulfur, wherein, the peroxide crosslinking agent comprises at least one of di-tert-butyl peroxide, dicumyl peroxide, tert-butyl cumyl peroxide, 1,1-di-tert-butyl peroxide-3,3,5-trimethylcyclohexane, 2,5-dimethyl-2,5-di(tert-butylperoxy) hexane, 2,5-dimethyl-2,5-di(tert-butylperoxy) hexyne-3, bis(tert-butylperoxyisopropyl)benzene, 2,5-dimethyl-2,5-bis(benzoylperoxy) hexane, tert-butyl peroxybenzoate, and tert-butylperoxy-2-ethylhexyl carbonate.

### Claim 15 (depends on 12)

The brake rubber diaphragm according to claim 12, wherein, the plasticizer comprises at least one of a paraffin oil, liquid ethylene-propylene rubber, liquid polyisobutene, and liquid 1,2-polybutadiene.

### Claim 16 (depends on 12)

The brake rubber diaphragm according to claim 12, wherein, the reinforcing filler comprises at least one of carbon black N330, carbon black N550, carbon black N774, calcium carbonate, and talc.