WO1985005329A1 - Revetement a coefficient de friction eleve pour pneumatiques de vehicules - Google Patents

Revetement a coefficient de friction eleve pour pneumatiques de vehicules Download PDF

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Publication number
WO1985005329A1
WO1985005329A1 PCT/EP1985/000182 EP8500182W WO8505329A1 WO 1985005329 A1 WO1985005329 A1 WO 1985005329A1 EP 8500182 W EP8500182 W EP 8500182W WO 8505329 A1 WO8505329 A1 WO 8505329A1
Authority
WO
WIPO (PCT)
Prior art keywords
frictional coefficient
high frictional
granules
coefficient coating
rubber
Prior art date
Application number
PCT/EP1985/000182
Other languages
English (en)
Inventor
Enrico Verzocchi
Original Assignee
Keratek S.R.L.
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 Keratek S.R.L. filed Critical Keratek S.R.L.
Publication of WO1985005329A1 publication Critical patent/WO1985005329A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/14—Anti-skid inserts, e.g. vulcanised into the tread band

Definitions

  • This invention relates to a high frictional coefficient coating for application to the rubber tires of vehicles and generic rolling bodies to enhance their non-skid properties on wet, snow and/or ice covered road surfaces.
  • spikes or chains can he applied. Chains have some well-known disadvantages, resulting in particular from the slow and uncomfortable ride of the vehicle even when, on removal of the ice or snow layer from the road surface, the vehicle is to run over the normal wearing course of the road; in that case, chains must be taken off or speed of travel is to he drastically reduced, while the vehicle and passengers are subjected to objectionable vibration.
  • Spikes have instead the disadvantage that while they can provide good traction on an ice covered road, quite a different situation is experienced in deep snow. Further, the spikes may come loose from the tire tread on an asphalt surface, to make the road condition dangerous and the wheel traction unevenly distributed.
  • an object of this invention to provide a high frictional coefficient anti-skid coating for application to the rubber tires of vehicle wheels and rolling bodies in general, wherehy they can be made particularly well skid-resisting on wet, snow and/or ice covered road surfaces.
  • Another object of this invention is to provide ice and snow wheels for motor vehicles, that is, to improve the traction power of such wheels as a motor vehicle is driven over wet and/or snow and/or ice covered road surfaces.
  • a coating comprising, according to the invention, a supporting, elastic grip substrate incorporating a plurality of hard bodies or “granules” distributed randomly thereon and protruding part-way out of the surface of the supporting substrate and having a hardness-preferably no lower than 7 Mohs, said supporting substrate including at least one, synthetic or natural rubber, and at least one synthetic resin, advantageously of the epoxy kind, said granules being granules of an inorganic material having a hardness preferably no lower than 7 Mohs and being in the shape of irregular polyhedrons envelopable by ideal spheres having a diameter on the order of 1 to 9 mm, preferably 1-3 mm.
  • Said rubber or said resin (which would contain, of course, known conventional additives and adjuvants, such as stabilizers, curing agents, plasticisers, reinforcing fillers, anti-oxidants, and the like) hold said granules anchored therein being bonded to the same by bonds of a physical, and/or physico-chemical nature.
  • Said granules (hereinafter referred to also as "hard granules”) preferably comprise, according to the invention, a substance selected from a group including natural or synthetic corundum, boron carbide, tungsten carbide, silicon carbide, titanium carbide, widia, metal-ceramic and ceramic materials.
  • one embodiment of the invention consists of providing four already worn motor car rubber tired wheels, removing with conventional methods the tire worn tread down to the "ply", then regenerating on the ply itself, and using known methods, a new tread employing a blend of vulcanisable rubber, known in the art, to which blend there are incorporated (prior to its forming and vulcanisation) hard granules of the type described above in conformity with the invention (e.g. corundum) in an amount varying in the 30% to 50% by weight of the blend range.
  • a blend of vulcanisable rubber known in the art, to which blend there are incorporated (prior to its forming and vulcanisation) hard granules of the type described above in conformity with the invention (e.g. corundum) in an amount varying in the 30% to 50% by weight of the blend range.
  • said hard granules Prior to being incorporated to the rubber blend, said hard granules may be coated with a thin layer of an adhesive having a high compatibility and affinity for both rubber and the hard granules, and this for the purpose of making the adhesion-incorporation of said granules to the end rubber strong and stable once it is formed and vulcanised to provide the new snow and ice tread for the four wheels, which wheels are thus ready for use on wet and/or snow and/or ice covered road surfaces.
  • an adhesive having a high compatibility and affinity for both rubber and the hard granules
  • the foregoing method may be implemented (rather than on rebuilding used tires) during the standard process of tire making (or making of pneumatic tires for motor vehicles and the like), by incorporating at a suitable stage of the manufacturing process the hard granules to the blend wherefrom the tire tread is to be formed.
  • Ditta Chemplast of Buccinasco, Milan, Italy are heated separately to a temperature in the 30° to 40°C range, and said two components are then mixed together.
  • the resulting resinous syrup is applied evenly to form a layer of about 3-8 mm over the tread of four motor car tires (still in a usable condition) as previously degreased with trichloroethylene; thereafter, said syrup is allowed to cure at room temperature until it achieves a "soft" consistency.
  • sections of 10 mm wide adhesive tape Prior to spreading said resinous syrup over the tread, sections of 10 mm wide adhesive tape are laid onto the latter in crisscrossing configuration to form a plurality of lozenges with the sides of the lozenges measuring approximately 10 to 14 cm. It may be appreciated that during the application no resin will adhere on the tread areas occupied by the tape sections (thus enabling the later formation of draining flutes and leading edges).
  • a further epoxy resin syrup similar to the former syrup is prepared, except that incorporated to and homogeneously dispersed through the syrup are irregular polyhedral granules of corundum, of the red-brown type having a hardness of 9 Mohs and an average size of about 2.5 mm (in terms of the diameter of an ideal sphere enveloping said granules), said granules amounting to about 75% by weight with respect to the resinous syrup.
  • This composition forming a "dispersion" of corundum granules through an epoxy resin, is evenly spread to a depth of about 3-6 mm over the treads of the-previously coated four wheels --as described hereinabove --with an epoxy resin in the "soft" state.
  • the four wheels are then allowed to stand, in a suitable containing molds, for about 10 hours, thereby the resinous syrup of the aforesaid dispersion is brought to cure to a consistency which permits of its handling, thereafter, on removal of the aforementioned tape sections, the four wheels are subjected to treatment in a kiln to a temperature of 60-70°C so as to complete curing of the syrups previously applied in two successive steps as described above, which will form, therefore, a unitary body incorporating in the outer layer the corundum granules, said granules being at least part-way embedded in said outer layer from which they stand proud, at least partially.
  • Another embodiment of the invention consists of preparing a fluted rubber band which is preferably at least partly pre-shaped to conform with the rolling cross-section of a motor car wheel, said band having a length which is substantially equal to the circumferential length of said wheel and incorporating hard granules (such as corundum ones), said granules protruding at least part-way outwards once said band has been applied to the wheel.
  • Assembling of the band, as provided by the invention, to the wheel is carried out by either by bonding, as by adhesive means, the inward surface of the band to the outward surface of the wheel tread, or by detachably anchoring the band to the wheel via securing means of some known type.
  • a further embodiment of the invention consists of applying (by brush, spray, and the like) a syrup of a resin (such as an epoxy resin) over the entire surface (including any recesses) of the tread of a motor car wheel tire, and then "dusting” it with granules (e.g. of corundum), thereafter the resin is thoroughly cured preferably at 50-60°C in a kiln.
  • a resin such as an epoxy resin
  • Yet another embodiment of the invention consists of preparing (with suitable molds and known techniques) blocks comprised of a supporting and elastic grip substrate of rubber or resin incorporating a plurality of hard bodies or granules distributed randomly therethrough and projecting part-way from the outward block. surface.
  • Such blocks would have a substantially parallelepipedal or truncated pyramid shape, or the like, with a base whose dimensions are orientatively in the range of 1x1 cm to 6x6 cm, with a depth orientatively in the 4 to 10 mm range.
  • said blocks could be fonned directly into recesses formed in the tire tread, by pouring directly into the recesses a blend according to the invention, i.e. either rubber or resin including the cited hard granules.
  • the selection of the synthetic resin and/or rubber may be made from a wide choice of homopolymers, copolymers, and elastomers, there being well defined, as previously explained, the applicational characteristics (of both the product and process) for said synthetic resin and said rubber, in particular their ability to elastically retain the hard bodies or "granules" therein.
  • each of said layers comprises a different type of resin, each of said resin types having different hardness, elasticity and adhesion characteristics so as to provide for optimum elastic securement of the granules therein.
  • the formation of the aforesaid layers is accomplished through one or more of the various known methods, such as by applying (by dip coating, spraying, brushing and the like) the resin in the polycondensation phase or a polymer dissolved in an organic solvent (which is then removed during the drying step).

Abstract

Un revêtement à coefficient de friction élevé destiné à être appliqué sur des pneumatiques de véhicules et des corps roulant en général dans le but de les rendre antidérapants sur des surfaces de route mouillées, enneigées ou glacées, comprend un substrat élastique d'adhérence au sol et de support dans lequel sont incorporés plusieurs corps durs ou "granules" ayant une dureté d'au moins 7 Mohs et distribués au hasard sur ce substrat et faisant saillie partiellement à la surface du substrat; ce substrat de support est formé à partir d'au moins un caoutchouc et d'au moins une résine synthétique, les granules comprenant une substance inorganique et ayant la forme de polyhèdres irréguliers pouvant être enveloppés par des sphères idéales d'un diamètre de l'ordre de 1 à 9 mm, de préférence 1 à 3 mm.
PCT/EP1985/000182 1984-05-22 1985-04-22 Revetement a coefficient de friction eleve pour pneumatiques de vehicules WO1985005329A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT8421039A IT1209545B (it) 1984-05-22 1984-05-22 Rivestimento ad alto coefficiente d'attrito per pneumatici di ruotedi veicoli e corpi di rotolamento in genere per renderli resistenti allo scivolamento.
IT21039A/84 1984-05-22

Publications (1)

Publication Number Publication Date
WO1985005329A1 true WO1985005329A1 (fr) 1985-12-05

Family

ID=11175783

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1985/000182 WO1985005329A1 (fr) 1984-05-22 1985-04-22 Revetement a coefficient de friction eleve pour pneumatiques de vehicules

Country Status (4)

Country Link
EP (1) EP0214970A1 (fr)
DD (1) DD235224A5 (fr)
IT (1) IT1209545B (fr)
WO (1) WO1985005329A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0408941A2 (fr) * 1989-07-21 1991-01-23 PIRELLI COORDINAMENTO PNEUMATICI Società per Azioni Bandage pneumatique ayant une bonne adhérence
WO1994025298A1 (fr) * 1993-04-26 1994-11-10 Erling Christensen Surface d'usure pour des pneus utilises dans des conditions hivernales
US7195045B2 (en) * 2001-09-27 2007-03-27 Sumitomo Rubber Industries, Ltd. Tire having tread including glass fibers and particles having Moh's hardness of at least 5
US20150217522A1 (en) * 2014-02-04 2015-08-06 Vikrant Ragula Methods and devices for improving usable life of wearable surfaces
US10967678B2 (en) 2014-01-16 2021-04-06 Bridgestone Americas Tire Operations, Llc Tire with laminate and method of making same

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4229289A1 (de) * 1992-09-02 1994-03-10 Kraiburg Gummi Dev Gmbh Gleisübergangseinrichtung, Formkörper für eine Gleisübergangseinrichtung und Verfahren zur Herstellung eines Formkörpers für eine Gleisübergangseinrichtung

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1365406A (fr) * 1963-05-20 1964-07-03 élément mobile à garnissage antidéparant
FR2105597A5 (en) * 1970-09-14 1972-04-28 Rochman Henri Anti-skid tyre coating - comprising abrasive filled catalysed rubber
FR2317109A1 (fr) * 1975-07-11 1977-02-04 Daniel Jean Nouveau procede de fabrication de pneumatiques antiderapants

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1365406A (fr) * 1963-05-20 1964-07-03 élément mobile à garnissage antidéparant
FR2105597A5 (en) * 1970-09-14 1972-04-28 Rochman Henri Anti-skid tyre coating - comprising abrasive filled catalysed rubber
FR2317109A1 (fr) * 1975-07-11 1977-02-04 Daniel Jean Nouveau procede de fabrication de pneumatiques antiderapants

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0408941A2 (fr) * 1989-07-21 1991-01-23 PIRELLI COORDINAMENTO PNEUMATICI Società per Azioni Bandage pneumatique ayant une bonne adhérence
EP0408941A3 (en) * 1989-07-21 1991-07-03 Pirelli Coordinamento Pneumatici Societa Per Azioni Tyre with high adherence
WO1994025298A1 (fr) * 1993-04-26 1994-11-10 Erling Christensen Surface d'usure pour des pneus utilises dans des conditions hivernales
US5733650A (en) * 1993-04-26 1998-03-31 Christensen; Erling Wearing surface for tires for winter conditions
US7195045B2 (en) * 2001-09-27 2007-03-27 Sumitomo Rubber Industries, Ltd. Tire having tread including glass fibers and particles having Moh's hardness of at least 5
US10967678B2 (en) 2014-01-16 2021-04-06 Bridgestone Americas Tire Operations, Llc Tire with laminate and method of making same
US20150217522A1 (en) * 2014-02-04 2015-08-06 Vikrant Ragula Methods and devices for improving usable life of wearable surfaces

Also Published As

Publication number Publication date
IT8421039A0 (it) 1984-05-22
IT1209545B (it) 1989-08-30
EP0214970A1 (fr) 1987-03-25
DD235224A5 (de) 1986-04-30

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