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WO2019234570A1 - Couche d'étanchéité d'un pneumatique et procédé pour sa préparation - Google Patents

Couche d'étanchéité d'un pneumatique et procédé pour sa préparation Download PDF

Info

Publication number
WO2019234570A1
WO2019234570A1 PCT/IB2019/054537 IB2019054537W WO2019234570A1 WO 2019234570 A1 WO2019234570 A1 WO 2019234570A1 IB 2019054537 W IB2019054537 W IB 2019054537W WO 2019234570 A1 WO2019234570 A1 WO 2019234570A1
Authority
WO
WIPO (PCT)
Prior art keywords
sealing layer
compound
pneumatic tyre
radiation
viscosity
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/IB2019/054537
Other languages
English (en)
Inventor
Pasquale Agoretti
Claudio D'ALFONSO
Giuseppe PEZZULLO
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bridgestone Corp
Original Assignee
Bridgestone Corp
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 Corp filed Critical Bridgestone Corp
Publication of WO2019234570A1 publication Critical patent/WO2019234570A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/26—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers modified by chemical after-treatment
    • C08L23/28—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers modified by chemical after-treatment by reaction with halogens or halogen-containing compounds
    • 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
    • B29C73/16—Auto-repairing or self-sealing arrangements or agents
    • B29C73/163—Sealing compositions or agents, e.g. combined with propellant agents
    • 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
    • B29C73/16—Auto-repairing or self-sealing arrangements or agents
    • B29C73/22—Auto-repairing or self-sealing arrangements or agents the article containing elements including a sealing composition, e.g. powder being liberated when the article is damaged
    • 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)
    • B29D30/0681—Parts of pneumatic tyres; accessories, auxiliary operations
    • B29D30/0685—Incorporating auto-repairing or self-sealing arrangements or agents on or into tyres
    • 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)
    • B29D30/0681—Parts of pneumatic tyres; accessories, auxiliary operations
    • B29D30/0685—Incorporating auto-repairing or self-sealing arrangements or agents on or into tyres
    • B29D2030/0686—Incorporating sealants on or into tyres not otherwise provided for; auxiliary operations therefore, e.g. preparation of the tyre

Definitions

  • the present invention relates to a sealing layer of a pneumatic tyre.
  • the present invention also involves a new advantageous method for the implementation of such sealing layer .
  • pneumatic tyres of a viscous sealing layer generally arranged within the inner cavity of the pneumatic tyre, has been known for a long time.
  • the sealing layer is arranged in contact with the innerliner layer at the tread band.
  • the function of the sealing layer is to implement a sort of instantaneous "sealing" around the object that has penetrated the tread, thus avoiding the leakage of air from the pneumatic tyre. Furthermore, in case the penetrated object escapes, the material of the sealing layer has the function of filling the hole left by the object, thereby sealing it.
  • the viscosity of the sealing layer is one of the most important parameters for it to effectively perform what has been described above.
  • the viscosity of the sealing layer must be such to ensure both the sealing action on the penetrated object and on the hole left by the object itself in a short amount of time, as described above, and the stability thereof within the internal cavity of the pneumatic tyre during the phases of rolling or parking of the tire itself.
  • the sealing layer is implemented using a compound whose composition ensures the aforementioned sealing and stability
  • sealing layer requires the preparation of sealing layer "strips", which, depending upon the dimensions of the pneumatic tyre, are then arranged next to one another in order to form the sealing layer in its entirety.
  • the object of the present invention is a sealing layer to be applied to the inner surface of a pneumatic tyre and having a viscosity of between 100 and 1000 Pa-s at 100°C; said sealing layer being characterized in that it is implemented by means of a compound having a viscosity of between 10 and 100 Pa-s at 100°C; said compound comprising a halobutyl rubber and a polymer that is vulcanizable by means of UV radiation in an amount of between 30 and 80 phr; said viscosity being calculated according to the IS013145 standard procedure.
  • the compound with which the sealing layer is implemented comprises from 50 to 70 phr of the polymer that is vulcanizable by means of UV radiation.
  • the polymer that is vulcanizable by means of UV radiation is selected from the group consisting of epoxides, acrylates, urethanes, isocyanates.
  • the compound with which the sealing layer is implemented comprises from 100 to 400 phr of a plasticizing agent and from 10 to 50 phr of an adhesive resin .
  • the sealing layer has a thickness of between 2 mm and 5 mm.
  • a further object of the present invention is a method for the implementation and the application of a sealing layer implemented using the compound as defined above; said method comprises a deposition step of the compound of the invention upon an inner surface of a pneumatic tyre, and a vulcanization step wherein said deposited compound is irradiated with UV radiation.
  • both in said deposition step and said vulcanization step the pneumatic tyre is set in
  • said UV radiation has a wavelength of between 200 and 400 nm.
  • said UV radiation has a radiant emittance of between 250 W/m 2 and 1500 W/m 2 , more preferably between 500 W/m 2 and 1000 W/m 2 .
  • a compound was prepared for the implementation of a sealing layer according to the invention, whose
  • Halobutyl rubber is a bromo butyl rubber
  • the plasticizer used is polyisobutene
  • the polymer that is vulcanizable by means of UV is a polyether-acrylic resin
  • the adhesive resin used is a phenolic resin commonly used within the pneumatic tyre industry
  • the compound thus prepared has a viscosity of 20 Pa-s at 100°C.
  • the compound thus prepared was poured onto the inner wall of a pneumatic tyre placed in constant rotation.
  • the pneumatic tyre was kept in rotation for a period of time equal to 2 mins in order to ensure the uniform
  • the UV lamp responsible for the emission of said radiation was arranged at the radial center defined by the rotating pneumatic tyre.
  • the viscosity of the sealing layer thus formed was measured at 200 Pa-s at 100°C.
  • the viscosity measurement was obtained in accordance with the IS013145 standard procedure.
  • the viscosity of the compound with which the sealing layer is implemented (and therefore prior to the vulcanization by means of UV) and the viscosity of the sealing layer implemented by means of UV vulcanization are extremely important .
  • the sealing layer of the present invention in order for the sealing layer of the present invention to be effective it must have the right viscosity in order to be able to correctly perform the its sealing action, i.e., its instantaneous "sealing" action around the object that has penetrated the tread or filling the hole left by such object and, at the same time, the compound from which it is derived must have the right viscosity in order to be able to evenly distribute itself over the surface of the innerliner during the deposition step.
  • vulcanization system comprising 0.5 phr of sulfur, 1.5 phr of stearic acid, 1.0 phr of zinc oxide and 4.0 phr of accelerator.
  • the compound with which the comparison layer was implemented was mixed by means of the same procedures outlined above, to then be subjected to vulcanization and applied to the pneumatic tyre according to the methodology known in the industry.
  • the test in relation to pressure retention was performed on pneumatic tyres that, after being inflated with the same internal pressure, were subjected to the same puncture conditions with the subsequent removal of the object used for the same puncturing. For each of the pneumatic tyres tested the pressure retention was evaluated 24h after the puncturing (and subsequent removal of the object).
  • Table II lists the values of the pressure retention tests in indexed form in relation to the comparison sealing layer.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • General Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)

Abstract

L'invention concerne une couche d'étanchéité à appliquer sur la surface interne d'un pneumatique et ayant une viscosité comprise entre 100 et 1000 Pa.s à 100 °C.La couche d'étanchéité est mise en œuvre au moyen d'un composé ayant une viscosité comprise entre 10 et 100 Pa.s à 100° et comprenant un caoutchouc halogénobutyle et un polymère qui est vulcanisable au moyen d'un rayonnement UV en une quantité comprise entre 30 et 80 pcc.
PCT/IB2019/054537 2018-06-04 2019-05-31 Couche d'étanchéité d'un pneumatique et procédé pour sa préparation Ceased WO2019234570A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT102018000006012 2018-06-04
IT102018000006012A IT201800006012A1 (it) 2018-06-04 2018-06-04 Mescola di uno strato sigillante di uno pneumatico e metodo per la preparazione dello stesso

Publications (1)

Publication Number Publication Date
WO2019234570A1 true WO2019234570A1 (fr) 2019-12-12

Family

ID=63449554

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2019/054537 Ceased WO2019234570A1 (fr) 2018-06-04 2019-05-31 Couche d'étanchéité d'un pneumatique et procédé pour sa préparation

Country Status (2)

Country Link
IT (1) IT201800006012A1 (fr)
WO (1) WO2019234570A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022019207A1 (fr) * 2020-07-22 2022-01-27 横浜ゴム株式会社 Méthode et appareil de fabrication de pneu

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH045029A (ja) * 1990-04-23 1992-01-09 Bridgestone Corp 空気入りタイヤ
JPH06226870A (ja) * 1993-02-02 1994-08-16 Bridgestone Corp 空気入りタイヤ
EP2848642A1 (fr) * 2012-05-08 2015-03-18 Bridgestone Corporation Feuille de caoutchouc, pneu l'utilisant et procédé de fabrication de feuille de caoutchouc
WO2017093971A1 (fr) * 2015-12-02 2017-06-08 Bridgestone Corporation Procédé pour le traitement d'une couche d'étanchéité d'un pneu, produit d'étanchéité et pneu.

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH045029A (ja) * 1990-04-23 1992-01-09 Bridgestone Corp 空気入りタイヤ
JPH06226870A (ja) * 1993-02-02 1994-08-16 Bridgestone Corp 空気入りタイヤ
EP2848642A1 (fr) * 2012-05-08 2015-03-18 Bridgestone Corporation Feuille de caoutchouc, pneu l'utilisant et procédé de fabrication de feuille de caoutchouc
WO2017093971A1 (fr) * 2015-12-02 2017-06-08 Bridgestone Corporation Procédé pour le traitement d'une couche d'étanchéité d'un pneu, produit d'étanchéité et pneu.

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Week 199208, Derwent World Patents Index; AN 1992-060609, XP002788322 *
DATABASE WPI Week 199437, Derwent World Patents Index; AN 1994-299343, XP002788321 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022019207A1 (fr) * 2020-07-22 2022-01-27 横浜ゴム株式会社 Méthode et appareil de fabrication de pneu

Also Published As

Publication number Publication date
IT201800006012A1 (it) 2019-12-04

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