WO2012070022A1 - Tyre retreading method - Google Patents

Tyre retreading method Download PDF

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Publication number
WO2012070022A1
WO2012070022A1 PCT/IB2011/055310 IB2011055310W WO2012070022A1 WO 2012070022 A1 WO2012070022 A1 WO 2012070022A1 IB 2011055310 W IB2011055310 W IB 2011055310W WO 2012070022 A1 WO2012070022 A1 WO 2012070022A1
Authority
WO
WIPO (PCT)
Prior art keywords
compound
filler material
tyre
casing
parts
Prior art date
Application number
PCT/IB2011/055310
Other languages
French (fr)
Inventor
Gianluca Forte
Giovanbattista Maiuri
Original Assignee
Bridgestone Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bridgestone Corporation filed Critical Bridgestone Corporation
Priority to CN2011800561119A priority Critical patent/CN103228431A/en
Publication of WO2012070022A1 publication Critical patent/WO2012070022A1/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D30/00—Producing pneumatic or solid tyres or parts thereof
    • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
    • B29D30/52—Unvulcanised treads, e.g. on used tyres; Retreading
    • B29D30/54—Retreading
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G59/00—Polycondensates containing more than one epoxy group per molecule; Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups
    • C08G59/18—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing
    • C08G59/40—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing characterised by the curing agents used
    • C08G59/50—Amines
    • C08G59/5026—Amines cycloaliphatic
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L63/00—Compositions of epoxy resins; Compositions of derivatives of epoxy resins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C73/00—Repairing of articles made from plastics or substances in a plastic state, e.g. of articles shaped or produced by using techniques covered by this subclass or subclass B29D
    • B29C73/02—Repairing of articles made from plastics or substances in a plastic state, e.g. of articles shaped or produced by using techniques covered by this subclass or subclass B29D using liquid or paste-like material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D30/00—Producing pneumatic or solid tyres or parts thereof
    • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
    • B29D30/52—Unvulcanised treads, e.g. on used tyres; Retreading
    • B29D30/54—Retreading
    • B29D2030/544—Applying an intermediate adhesive layer, e.g. cement or cushioning element between carcass and tread

Definitions

  • the present invention relates to a tyre retreading method.
  • Tyre retreading methods are mainly of two types : hot and cold.
  • Cold retreading comprises inserting a green-rubber connecting layer between the cleaned casing and a pre- cured tread, to ensure the old casing adheres properly to the new tread when the tyre is cold-cured.
  • Cleaning the casing also requires removing any extraneous material which gets into the tyre during use, and which may have damaged the belts underneath the tread. Removing this material normally also requires removing any damaged parts of the belts, and then scraping the portion involved.
  • the belts are normally made of steel or Kevlar, and serve to stabilize the casing where the tyre interacts with the road surface. Which means any poorly repaired belts could impair performance of the retreaded tyre.
  • the cleaned casing will have actual cavities in the areas normally occupied by the belts. And it is an object of the present invention to provide a solution to the presence of these cavities.
  • thermosetting organic compound or thermosetting polymer compound is in the group comprising epoxy, vinyl, amide and phenol compounds .
  • the filler material comprises a setting compound, preferably in the group comprising amino compound, amide compound, imino compound, and peroxide compound.
  • the filler material comprises 5 to 70 parts by weight of setting compound per 100 parts by weight of thermosetting organic compound or thermosetting polymer compound.
  • Figure 1 shows an impact resistance test result graph
  • Figure 2 shows a dynamic rigidity test result graph.
  • a filler material was produced comprising 100 parts by weight of bisphenol A epoxy resin, 15 parts by weight of 4 , 4 ' -methylenebis-cyclohexanamine, and 5 parts by weight of natural-rubber latex. More specifically, the filler material was produced in a first step, in which the epoxy resin and latex were mixed; and a second step, in which the mix from the first step was mixed with the 4 , 4 1 -methylenebis- cyclohexanamine setting compound. The second step was conducted at low speed to prevent the setting compound from coagulating with the rubber latex.
  • the resulting filler material was heated to a cross-linking temperature ranging between 80 and 140°C, which appropriately overlaps with that to which retreaded tyres are heated to cure the connecting layer.
  • the filler material was tested for impact resistance and dynamic rigidity.
  • the impact resistance test was carried out using an MTS 831 machine, on which a 45° truncated-cone-shaped tip was compressed at a speed of 1 m/s.
  • the filler material according to the invention has more or less the same impact resistance as a new casing.
  • the load required to penetrate the filler material according to the invention is only slightly less than that of the new casing, whereas that of the connecting layer is much lower.
  • the dynamic rigidity test was carried out using an MTS 831 machine, on which a 10 cm 2 test piece was subjected to sinusoidal compression cycles with 10 Hz frequency, a rounded amplitude of 50N about the mean value, and a step-incremented applied-load range of 350 to 5000N.
  • the rectangle in the Figure 2 graph indicates the significant surface load range for normal tyre operation. Within this range, performance of the filler material according to the invention closely resembles that of the new casing, whereas the connecting layer is much less rigid.
  • the filler material according to the invention has also been found to adhere firmly to both the rubber and belt material.
  • the filler material according to the invention therefore has the advantage of filling the post-cleaning cavities in the casing with no mechanically discontinuous patches in the belt area, thus enhancing retreaded tyre performance, and so encouraging more widespread use of the retreading process, with all the economic and ecological advantages this affords.

Abstract

The invention relates to a tyre retreading method, wherein a new tread is applied to a worn-tyre casing and to a filler for filling cavities in a casing of a tyre for retreading. The method includes a step of cleaning the casing; and a step of filling in holes in the casing with a filler material including a thermosetting organic compound or a thermosetting polymer compound in the group including epoxy compound, vinyl compound, and phenol compound.

Description

TYRE RETREADING METHOD
TECHNICAL FIELD
The present invention relates to a tyre retreading method.
BACKGROUND ART
Tyres with worn treads are normally otherwise perfectly good, which means disposing of them is both economically and ecologically unfeasible.
To solve the problem, it is now common practice to retread worn tyres, by fitting a new tread to the old casing.
Tyre retreading methods are mainly of two types : hot and cold.
Cold retreading comprises inserting a green-rubber connecting layer between the cleaned casing and a pre- cured tread, to ensure the old casing adheres properly to the new tread when the tyre is cold-cured.
Cleaning the casing also requires removing any extraneous material which gets into the tyre during use, and which may have damaged the belts underneath the tread. Removing this material normally also requires removing any damaged parts of the belts, and then scraping the portion involved.
The belts are normally made of steel or Kevlar, and serve to stabilize the casing where the tyre interacts with the road surface. Which means any poorly repaired belts could impair performance of the retreaded tyre.
The cleaned casing will have actual cavities in the areas normally occupied by the belts. And it is an object of the present invention to provide a solution to the presence of these cavities.
A common practice is to fill the cavities with the same mix used for the connecting layer connecting the casing to the new tread. Though successful in producing retreaded tyres, this solution has the drawback of forming, in the belt area, structurally discontinuous patches with mechanical characteristics that differ widely from those of the belts and do not guarantee the required performance.
A need is therefore felt for a tyre retreading method designed to eliminate the drawbacks of the known art .
DISCLOSURE OF INVENTION
According to the present invention, there is provided a tyre retreading method, wherein a new tread is applied to a worn-tyre casing; said method comprising a step of cleaning the casing, and a step of filling in holes in the casing with a filler material; said method being characterized in that said filler material comprises a thermosetting organic compound or a thermosetting polymer compound. In a preferred embodiment, the thermosetting organic compound or thermosetting polymer compound is in the group comprising epoxy, vinyl, amide and phenol compounds .
In a preferred embodiment, the filler material comprises a setting compound, preferably in the group comprising amino compound, amide compound, imino compound, and peroxide compound.
In a preferred embodiment, the filler material comprises 5 to 70 parts by weight of setting compound per 100 parts by weight of thermosetting organic compound or thermosetting polymer compound.
BRIEF DESCRIPTION OF THE DRAWINGS
A non-limiting embodiment of the present invention will be described by way of example with reference to the attached drawings, in which :
Figure 1 shows an impact resistance test result graph;
Figure 2 shows a dynamic rigidity test result graph.
BEST MODE FOR CARRYING OUT THE INVENTION EXAMPLES
A filler material was produced comprising 100 parts by weight of bisphenol A epoxy resin, 15 parts by weight of 4 , 4 ' -methylenebis-cyclohexanamine, and 5 parts by weight of natural-rubber latex. More specifically, the filler material was produced in a first step, in which the epoxy resin and latex were mixed; and a second step, in which the mix from the first step was mixed with the 4 , 41 -methylenebis- cyclohexanamine setting compound. The second step was conducted at low speed to prevent the setting compound from coagulating with the rubber latex.
The resulting filler material was heated to a cross-linking temperature ranging between 80 and 140°C, which appropriately overlaps with that to which retreaded tyres are heated to cure the connecting layer.
The filler material was tested for impact resistance and dynamic rigidity.
For comparison purposes, the same tests were carried out on a belt portion of a new casing (i.e. with all the belts intact) and on a connecting layer representing known filler material.
The impact resistance test was carried out using an MTS 831 machine, on which a 45° truncated-cone-shaped tip was compressed at a speed of 1 m/s.
As shown in the Figure 1 graph, unlike the connecting layer, the filler material according to the invention has more or less the same impact resistance as a new casing. In fact, the load required to penetrate the filler material according to the invention is only slightly less than that of the new casing, whereas that of the connecting layer is much lower.
The dynamic rigidity test was carried out using an MTS 831 machine, on which a 10 cm2 test piece was subjected to sinusoidal compression cycles with 10 Hz frequency, a rounded amplitude of 50N about the mean value, and a step-incremented applied-load range of 350 to 5000N.
The rectangle in the Figure 2 graph indicates the significant surface load range for normal tyre operation. Within this range, performance of the filler material according to the invention closely resembles that of the new casing, whereas the connecting layer is much less rigid.
The filler material according to the invention has also been found to adhere firmly to both the rubber and belt material.
The filler material according to the invention therefore has the advantage of filling the post-cleaning cavities in the casing with no mechanically discontinuous patches in the belt area, thus enhancing retreaded tyre performance, and so encouraging more widespread use of the retreading process, with all the economic and ecological advantages this affords.

Claims

1) A tyre retreading method, wherein a new tread is applied to a worn-tyre casing; said method comprising a step of cleaning the casing, and a step of filling in holes in the casing with a filler material; said method being characterized in that said filler material comprises a thermosetting organic compound or a thermosetting polymer compound.
2) A tyre retreading method as claimed in Claim 1, characterized in that the thermosetting organic compound or thermosetting polymer compound is in the group consisting of epoxy compound, vinyl compound, amide compound and phenol compound.
3) A tyre retreading method as claimed in Claim 1 or 2, characterized in that the filler material comprises a setting compound.
4) A tyre retreading method as claimed in Claim 3, characterized in that said setting compound is in the group consisting of amino compound, amide compound, imino compound, and peroxide compound.
5) A tyre retreading method as claimed in Claim 4, characterized in that the filler material comprises 5 to 70 parts by weight of setting compound per 100 parts by weight of thermosetting organic compound or thermosetting polymer compound.
6) A tyre retreading method as claimed in Claim 5, characterized in that the filler material comprises 100 parts by weight of bisphenol A epoxy resin, and 15 parts by weight of 4 , 41 -methylenebis-cyclohexanamine .
7) A tyre retreading method as claimed in one of the foregoing Claims, characterized in that the filler material comprises a rubber latex.
8) A retreaded tyre, characterized by being retreaded as claimed in one of the foregoing Claims.
9) A filler material for filling cavities in a casing of a tyre for retreading; said filler material being characterized by comprising a thermosetting organic compound or a thermosetting polymer compound.
10) A filler material as claimed in Claim 9, characterized in that the thermosetting organic compound or thermosetting polymer compound is in the group consisting of epoxy compound, vinyl compound, and phenol compound.
11) A filler material as claimed in Claim 9 or 10, characterized by comprising a setting compound, which is preferably comprised in the group consisting of amino compound, amide compound, imino compound, and peroxide compound
12) A filler material as claimed in claim 11, characterized by comprising 5 to 70 parts by weight of setting compound per 100 parts by weight of thermosetting organic compound or thermosetting polymer compound .
13) A filler material as claimed in Claim 12, characterized by comprising 100 parts by weight of bisphenol A epoxy resin, and 15 parts by weight of 4,4'- methylenebis-cyclohexanamine.
14) A filler material as claimed in one of Claims 9 to 13, characterized by comprising a rubber latex.
PCT/IB2011/055310 2010-11-26 2011-11-25 Tyre retreading method WO2012070022A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2011800561119A CN103228431A (en) 2010-11-26 2011-11-25 Tyre retreading method

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT000938A ITTO20100938A1 (en) 2010-11-26 2010-11-26 METHOD FOR RECONSTRUCTION OF TIRES
ITTO2010A000938 2010-11-26

Publications (1)

Publication Number Publication Date
WO2012070022A1 true WO2012070022A1 (en) 2012-05-31

Family

ID=43743101

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2011/055310 WO2012070022A1 (en) 2010-11-26 2011-11-25 Tyre retreading method

Country Status (3)

Country Link
CN (1) CN103228431A (en)
IT (1) ITTO20100938A1 (en)
WO (1) WO2012070022A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114851614A (en) * 2022-04-07 2022-08-05 江苏逸盛投资集团有限公司 Tire retreading method

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3015352B1 (en) * 2013-12-23 2016-08-05 Michelin & Cie METHOD FOR RECHAMING A PNEUMATIC ENVELOPE

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4399852A (en) * 1980-06-30 1983-08-23 The Firestone Tire & Rubber Company Application of ambient temperature cured polymers or prepolymers to a cured elastomer
US4435456A (en) * 1981-10-28 1984-03-06 The Firestone Tire & Rubber Company Application of ambient temperature cured polymers or prepolymers to a cured elastomer
EP0199998A2 (en) * 1985-04-01 1986-11-05 The Firestone Tire & Rubber Company Tire repair by "patch only" method
US5361818A (en) * 1993-09-27 1994-11-08 The Goodyear Tire & Rubber Company Polyester/polyepoxide/rubber alloys
JP2000154302A (en) * 1998-11-20 2000-06-06 Sumitomo Durez Co Ltd Resin composition to be mixed with rubber
EP1270799A1 (en) * 2000-02-15 2003-01-02 Nippon Sheet Glass Co., Ltd. Fiber-treating agent and glass fiber and rubber product both made with the fiber-treating agent
WO2003005118A1 (en) * 2001-07-02 2003-01-16 Loctite Corporation Epoxy-based composition
EP1454935A1 (en) * 2003-03-04 2004-09-08 Air Products And Chemicals, Inc. Mannich-based adducts as water based epoxy curing agents with fast cure capabilities for green concrete application

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4399852A (en) * 1980-06-30 1983-08-23 The Firestone Tire & Rubber Company Application of ambient temperature cured polymers or prepolymers to a cured elastomer
US4435456A (en) * 1981-10-28 1984-03-06 The Firestone Tire & Rubber Company Application of ambient temperature cured polymers or prepolymers to a cured elastomer
EP0199998A2 (en) * 1985-04-01 1986-11-05 The Firestone Tire & Rubber Company Tire repair by "patch only" method
US5361818A (en) * 1993-09-27 1994-11-08 The Goodyear Tire & Rubber Company Polyester/polyepoxide/rubber alloys
JP2000154302A (en) * 1998-11-20 2000-06-06 Sumitomo Durez Co Ltd Resin composition to be mixed with rubber
EP1270799A1 (en) * 2000-02-15 2003-01-02 Nippon Sheet Glass Co., Ltd. Fiber-treating agent and glass fiber and rubber product both made with the fiber-treating agent
WO2003005118A1 (en) * 2001-07-02 2003-01-16 Loctite Corporation Epoxy-based composition
EP1454935A1 (en) * 2003-03-04 2004-09-08 Air Products And Chemicals, Inc. Mannich-based adducts as water based epoxy curing agents with fast cure capabilities for green concrete application

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114851614A (en) * 2022-04-07 2022-08-05 江苏逸盛投资集团有限公司 Tire retreading method

Also Published As

Publication number Publication date
ITTO20100938A1 (en) 2012-05-27
CN103228431A (en) 2013-07-31

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