DE3009866A1 - FUEL HOSE - Google Patents

Description

Fuel hose

The invention relates to an improved high performance fuel hose and a process for its manufacture.

The automotive industry has an express interest in the quality of a fuel hose being improved to withstand highly aromatic fuels, exposure to acidic gasoline, fuel leakage and other harsh treatments in service. For example, the usual butadiene rubber fuel hoses that contain carbon black have aging properties when heated, which are limited to 70 hours ^{at 100 ° C.} In contrast, the new regulations of Generals Motors Co. are designed for tougher test standards.

The improved tubing extended heat aging up to 720 hours and preferably up to 1000 hours at a temperature of 125 ⁰ C, reduces the degraded from the fuel does not soluble methanol substances and reach a use at a temperature up to 40 ° C and the degrading Methanolic insoluble substances in oil and gasoline. These advantages are maintained with optimized compensation for fuel permeability loss and flexibility at low temperatures with an acrylonite-butadiene bonded antioxidant butadiene rubber inner tube with a coating of bonded chlorosulfonated polyethylene.

The hose according to the invention consists of a fuel-resistant one bound antioxidant butadiene

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rubber pipe or at least one layer thereof with or without bobbin lace or spiral fabric with fiber-wound reinforcement and covered with a heat- and ozone-resistant covering compound such as chlorosulfonated polyethylene or another corresponding material. A bound antioxidant nitrile polymer with an acrylonitrile content between 22 and 32 percent can be ^{bent up to -4-O 0} C, with 28 to 30 / a being preferred. A bonded antioxidant butadiene rubber with an acrylonitrile content of 32 to 4-2 percent gives a higher resistance to fuel penetration losses with 3 to 38 percent acrylonitrile polymer which is preferred for the optimal balance of the permeability and flexibility at low temperatures. This bonded antioxidant-antiozonant-butadiene rubber, which is predominantly made with mineral fillers with sufficient addition of carbon black only for coloring purposes, and softens with a plasticizer selected for heat dissipation, flexibility at low temperatures and the absence of insoluble methanol substances broken down from the fuel is preferred. Common antioxidants that are added are selected when used for their compatibility with the bound antioxidant system. Lubricants and processing aids are preferred in the distribution of fuel-insoluble substances.

A hardening system with sulfur- releasing accelerators is preferred with little or no sulfur and with zinc oxide activation for long-term heat resistance.

The expression "bound antioxidant butadiene rubber" is used to designate the well-known terpolymers, which are made from butadiene, acrylonitrile and n (4-anilinophenyl) -

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Methacrylamide or Acrylamide are made, and can as Chegum HR 765 betadiene rubber.

The chlorosulfonated polyethylenes are well known and available as Hypalon (Trademark). The chlorosulfonated polyethylene (100 parts basis) is mixed with about 25 to 125 parts filler, 3 to 8 percent magnesia, 3 to 8 parts of a hydrocarbon plasticizer and 0.5 to 4 parts of sulfur accelerator. The resulting mixed chlorosulfonated polyethylene is as a coating of the hose is appropriate.

The nature of the invention can be better understood with the help of examples where all parts and percentages refer to the Weight unless otherwise indicated.

example

A common bonded antioxidant butadiene rubber, which is mixed for extruding a pipe to make a hose is made as follows:

Components

Chemigum HR-765 talc coated stearate

finely divided silicon mixed from 3.5 and 10 to 20 microns

Polyethylene Antioxidant-Amine Liquid Plasticizer (Resin Type)

Stearing acid zinc oxide silane

Mineral oil dispersion of MgO

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ORIGINAL INSPiCTED

Shares , 0 100 , 0 40 , 0 55 , 0 1 , 0 4th , 0 22nd , 5 O , 0 5 , 0 1 , 0 10

Usually, the masterbatch (100) is made with 1.2 tedlen a sulfur rubber accelerator and 1.2 parts of SuI-fanid accelerator and a small amount of a scorch retardant, e.g., dithiomorpholine, are mixed to obtain a curable mixture.

This hardening mixture is fed to an extruder and extruded as a tube. This tube is then coated with 0.5 to 1 cm of a mixed chlorosulfonated polyethylene available under the trademark "Hypalon". The coated tube is then cured at 163 ° C. for minutes and the improved tube is obtained. This tube shows an increased service life at 125 ° C. in an oven with circulating air compared to a conventional tube made from a butadiene rubber tube and a chlorosulfonated polyethylene layer. This new hose also shows increased strength compared to methanol ^{extract materials and better properties at -40 0} G. Mixed chlorosulfonated polyethylene for the outer coating of hoses is:

Type of polymer fraction

chlorosulfonated polyethylene. 100.0

Ethylene-propylene-diene terpolymer 3.0

Polyethylene 5.0

MT carbon black ■ 50.0

aromatic hydrocarbon resin. 5.0

Nickel dibutyl dithiocarbamate x 1.0

Polyethylene lubricant 2.0

Magnesium oxide 5.0

N, N7-m-phenylenedimalimide 1.0

Benzotheazyl disulfide 1.0

Dipentamethylene thiuram 1.0

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30Q9866

In another embodiment example, the extruded, bonded antioxidant butadiene rubber with a reinforced member such as nylon or polyester fabric or Covering wrapped with chlorosulfonated polyethylene before coating. This reinforced hose is particularly desirable where pressurized systems are required.

Certain embodiments and details have been described to illustrate the invention. However, various modifications are possible without departing from the spirit and scope of the invention.

summary

An improved fuel hose also has at least a layer of mixed cured butadiene rubber in an antiozonant and a layer of chlorosulfonated Polyethylene.

030041/0606

Claims (3)

Meissner & Meissner 3 O O 9 8 6 δ PATENTAN WALTS OFFICE BERLIN - MÖNCHEN PATENT LAWYERS DIPL-ING. W. MEISSNER DIPL-ING. P. E. MEISSNER DIPL-ING. H.-J. PRESTING Admission · Representative before the European Patent Office - Professional Representatives before the European Patent Office Your reference Your letter of Our reference Herbertstr. 22, 1000 BERLIN 33 79068 A-GE March 12, 1980 The Goodyear Tire & Rubber Company
Akron, Ohio 44-316, USA Claims (Λ . Hose characterized by at least one inner layer made of bonded antiozonant butadiene rubber and an outer layer made of a cWorsulfonated polyethylene. 2. Hose according to claim 1, characterized in that that the hose contains reinforced links. 3. Hose according to claim 1, characterized in that that the butadiene rubber contains butadiene and 22 to 43 percent acrylonitrile. 030041/0606 ,,. ,,.;, ^{J rELEX;} TELEGRAM: TELEPHONE: BANK ACCOUNT- l't .-. R-.r HfCKKOMro- , AVlVn) H 1-8Ö8M INVENTION BERLIN BtKIINE R BANK ACi. .V Ml,., 'Hi., < BLNW / i M V- _M : -r ₍ η ' ^{NVLN d} QtRLlN OJ-JiIJI 60 37 BEKLlNJI U ₂ ΒΪ - IuJ' 'ν! V ₁ J-LAh O.) aB «2382 38a5716U00