EP0635559A2 - Siloxane lubricating composition without hydrogen emissions - Google Patents

Siloxane lubricating composition without hydrogen emissions Download PDF

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Publication number
EP0635559A2
EP0635559A2 EP94420194A EP94420194A EP0635559A2 EP 0635559 A2 EP0635559 A2 EP 0635559A2 EP 94420194 A EP94420194 A EP 94420194A EP 94420194 A EP94420194 A EP 94420194A EP 0635559 A2 EP0635559 A2 EP 0635559A2
Authority
EP
European Patent Office
Prior art keywords
reactive polydimethylsiloxane
reactive
order
polydimethylsiloxane
lubricant composition
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.)
Withdrawn
Application number
EP94420194A
Other languages
German (de)
French (fr)
Other versions
EP0635559A3 (en
Inventor
Angela M. Crowe
David M. Freedman
Joyce A. Rodriguez
Joseph J. Fanelli
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.)
Bayer CropScience Inc USA
Original Assignee
Rhone Poulenc Specialites Chimiques
Rhone Poulenc Specialty Chemicals Co
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 Rhone Poulenc Specialites Chimiques, Rhone Poulenc Specialty Chemicals Co filed Critical Rhone Poulenc Specialites Chimiques
Publication of EP0635559A2 publication Critical patent/EP0635559A2/en
Publication of EP0635559A3 publication Critical patent/EP0635559A3/en
Withdrawn legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M173/00—Lubricating compositions containing more than 10% water
    • C10M173/02—Lubricating compositions containing more than 10% water not containing mineral or fatty oils
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M105/00—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound
    • C10M105/76—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound containing silicon
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M107/00—Lubricating compositions characterised by the base-material being a macromolecular compound
    • C10M107/50—Lubricating compositions characterised by the base-material being a macromolecular compound containing silicon
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    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M129/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing oxygen
    • C10M129/02—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing oxygen having a carbon chain of less than 30 atoms
    • C10M129/26—Carboxylic acids; Salts thereof
    • C10M129/28—Carboxylic acids; Salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms
    • C10M129/30—Carboxylic acids; Salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having 7 or less carbon atoms
    • C10M129/36—Carboxylic acids; Salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having 7 or less carbon atoms containing hydroxy groups
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    • C10M139/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing atoms of elements not provided for in groups C10M127/00 - C10M137/00
    • C10M139/04—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing atoms of elements not provided for in groups C10M127/00 - C10M137/00 having a silicon-to-carbon bond, e.g. silanes
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    • C10M145/00—Lubricating compositions characterised by the additive being a macromolecular compound containing oxygen
    • C10M145/02—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • C10M145/10—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing monomers having an unsaturated radical bound to a carboxyl radical, e.g. acrylate
    • C10M145/12—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing monomers having an unsaturated radical bound to a carboxyl radical, e.g. acrylate monocarboxylic
    • C10M145/14—Acrylate; Methacrylate
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    • C10M145/18—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • C10M145/24—Polyethers
    • C10M145/26—Polyoxyalkylenes
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    • C10M155/02—Monomer containing silicon
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    • C10M2201/02—Water
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    • C10M2207/10—Carboxylix acids; Neutral salts thereof
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    • C10M2207/121—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of seven or less carbon atoms
    • C10M2207/124—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of seven or less carbon atoms containing hydroxy groups; Ethers thereof
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    • C10M2209/02—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • C10M2209/08—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing monomers having an unsaturated radical bound to a carboxyl radical, e.g. acrylate type
    • C10M2209/084—Acrylate; Methacrylate
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    • C10M2209/10—Macromolecular compoundss obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • C10M2209/103—Polyethers, i.e. containing di- or higher polyoxyalkylene groups
    • C10M2209/104—Polyethers, i.e. containing di- or higher polyoxyalkylene groups of alkylene oxides containing two carbon atoms only
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    • C10M2229/02—Unspecified siloxanes; Silicones
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    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2229/00—Organic macromolecular compounds containing atoms of elements not provided for in groups C10M2205/00, C10M2209/00, C10M2213/00, C10M2217/00, C10M2221/00 or C10M2225/00 as ingredients in lubricant compositions
    • C10M2229/04—Siloxanes with specific structure
    • C10M2229/05—Siloxanes with specific structure containing atoms other than silicon, hydrogen, oxygen or carbon
    • C10M2229/054—Siloxanes with specific structure containing atoms other than silicon, hydrogen, oxygen or carbon containing phosphorus
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2020/00—Specified physical or chemical properties or characteristics, i.e. function, of component of lubricating compositions
    • C10N2020/01—Physico-chemical properties
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/30—Refrigerators lubricants or compressors lubricants
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/32—Wires, ropes or cables lubricants
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/34—Lubricating-sealants
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/36—Release agents or mold release agents
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/38—Conveyors or chain belts
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/40—Generators or electric motors in oil or gas winning field
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/42—Flashing oils or marking oils
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/44—Super vacuum or supercritical use
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/50—Medical uses
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2050/00—Form in which the lubricant is applied to the material being lubricated
    • C10N2050/01—Emulsions, colloids, or micelles

Definitions

  • the present invention relates to a siloxane-based lubricating composition, and in particular a composition used for coating a vulcanization bladder of tires constituting an element of the tire manufacturing operation.
  • the shaping of the tire is obtained by inflating a rubber bag, or vulcanization bladder, inside a carcass of a raw tire, the tire being thus applied strongly against the mold surface.
  • a rubber bag or vulcanization bladder
  • US Patent Re. 32,318 describes a lubricant for a tire vulcanization bladder for use as a coating on the surface of the bladder.
  • Said lubricant contains (A) of the order of 20 to 40 parts by weight of polydimethylsiloxane having a kinematic viscosity of between approximately 1.2.10 ⁇ 5 and 28 m2.s ⁇ 1 (i.e.
  • the non-reactive polydimethylsiloxane (a) and the reactive polydimethylsiloxane (b) must be present together, in order to obtain a lubricating composition having effective lubrication / release and durability properties, it being understood that this last property consists of capacity, in a single application of lubricant composition, to obtain effective lubrication / release during several tire manufacturing cycles, for example, up to five cycles, without having to make a new application of lubricant composition.
  • the non-reactive polydimethylsiloxane (a) has a viscosity of the order of 5.10 ⁇ 5 to 30 m2.s ⁇ 1 (or about 5.10 ⁇ 2 to 30.103 Pa.s) and is advantageously made up of a mixture of polydimethylsiloxane (s ) non-reactive (i) of high viscosity helping to ensure the durability of the lubricating composition and non-reactive polydimethylsiloxane (s) (ii) of medium viscosity helping to ensure its lubricating power.
  • the non-reactive polydimethylsiloxane (a) consists of such a mixture
  • the high viscosity siloxane (i) will generally have a viscosity of at least 10 ⁇ 1 m2 ⁇ s ⁇ 1 (or at least about 102 Pa.s) , and preferably of the order of 10 to 25 m2.s ⁇ 1 (or about 10.103 to 25.103 Pa.s) at 25 ° C
  • the low to medium viscosity siloxane (ii) will generally have a viscosity of less than 10 ⁇ 1 m2.s ⁇ 1 (i.e.
  • the weight ratio between the polydimethylsiloxane (s) of high viscosity (i) and the polymethylsiloxane (s) of low to medium viscosity can vary between approximately 1: 10 and approximately 10: 1, preferably between approximately 1 : 5 and about 5: 1.
  • the lubricating composition will contain around 20 to 95%, preferably around 40 to 75%, by weight of non-reactive polydimethylsiloxane (s) (a) by based on the total weight of non-reactive polydimethylsiloxane (a) and reactive polydimethylsiloxane (b).
  • Non-reactive, high viscosity (i) specific polydimethylsiloxanes which can be used include Rhodorsil Emulsion M-405 from Rhône-Poulenc Inc. which is a siloxane emulsion whose siloxane component has a nominal viscosity greater than 10 ⁇ 1 m2 .s ⁇ 1 (ie greater than approximately 102 Pa.s) at 25 ° C., Silicone 2068 from General Electric Co. which is a siloxane emulsion whose siloxane component has a nominal viscosity greater than 10 ⁇ 1 m2.s ⁇ 1 (i.e.
  • the specific non reactive low to medium viscosity (ii) polydimethylsiloxanes that can be used include Rhodorsil Fluid H47V100 from Rhône-Poulenc Inc. which has a nominal viscosity of 10 ⁇ 4 m2.s ⁇ 1 (or about 10 ⁇ 1 Pa.s) at 25 ° C, PS041 and PS047 from Hüls America Inc. which have nominal viscosities of 10 ⁇ 4 and 3.10 ⁇ 2 m2.s ⁇ 1 respectively (i.e. approximately 10 ⁇ 1 and 30 Pa.s ) at 25 ° C, the Dow 200 from Dow-Corning Corp.
  • the reactive polydimethylsiloxane component (b) can be chosen from any of the hydroxyl-terminated and / or alkoxy-terminated polydimethylsiloxanes having a viscosity of the order of 1.5.10 ⁇ 5 to 5 m2.s ⁇ 1 (or about 1.5.10 ⁇ 2 to 5.103 Pa.s), preferably of the order of 5.10 ⁇ 5 to 10 ⁇ 2 m2.s ⁇ 1 (or approximately 5.10 ⁇ 2 to 10 Pa.s) at 25 ° C.
  • the specific reactive polydimethylsiloxanes (b) that can be used to obtain generally good results include the hydroxyl-terminated polydimethylsiloxanes L-9000 from Union Carbide Corp.
  • the reactive polydimethylsiloxane component (b) can be present in the range of 5 to 80, preferably in the range of 25 to 60% by weight relative to the mixture of non-reactive polydimethylsiloxane (s) ( s) (a) and reactive polydimethylsiloxane (s) (b).
  • the crosslinking component (c) can be chosen from any of the known conventional compounds used to crosslink the reactive polydimethylsiloxane component (b), such as for example those described in US Pat. No. 4,889,770 and the content of which is incorporated herein by reference .
  • Known and conventional crosslinkers include organotrialcoxysilanes, organotriacyloxysilanes, organotrioximesilanes and tetraalkylsilicates. It is preferred to use here the alkyltrialkoxysilanes and, among these, more particularly methyltrimethoxysilane.
  • the crosslinking component (c) reacts with the terminal hydroxyl and / or alkoxy groups of the reactive polydimethylsiloxane component (b) to crosslink the latter and give an adherent film.
  • the crosslinking reaction does not requires only small amounts of crosslinker, for example of the order of 0.01 to 5, preferably of the order of 0.02 to 2% by weight relative to the reactive polydimethylsiloxane (b), and can be done with or without addition of catalyst (although the reaction may, in certain cases, be catalyzed by a component of the tire vulcanization bladder to which the lubricant composition is applied).
  • surfactants used up to now in the manufacture of an adhesive composition for tire crosslinking bladders can be used here.
  • suitable surfactants which can be used in the adhesive compositions of the present invention are anionic, cationic and nonionic surfactants such as alkyl or arylpolyglycol ethers or alkylphenols such as polyoxyethylenated alkyl phenols, Polyoxyethylene sorbitan hexastearate, polyoxyethylene isodecyl ether, polyethylene glycol trimethylnonyl ether containing 3 to 15 units of ethylene oxide per molecule, polyoxyethylene sorbitan oleate having a saponification index of 102 to 108 and an index from 25 to 35 hydroxyl, polyoxyethylene cetylstearyl ethers, etc.
  • the amounts of surfactant and water used can vary considerably provided that, of course, an emulsion is obtained.
  • the stable emulsions may contain on the order of 2 to 50, preferably 5 to 40% by weight of mixture of components (a), (b) and (c), on the order of 0.5 to 5, preferably of the order of 1 to 4% by weight of surfactant (s) (d) and of the order of 50 to 95, preferably of the order of 60 to 90% by weight of water.
  • the aqueous emulsion can be easily prepared using known and conventional methods and apparatus.
  • the lubricant composition according to the present invention may also contain one or more optional ingredients such as film-forming polymers, for example, of the acrylic type, catalysts for the crosslinking reaction, complementary lubricants and anti-friction agents, evacuation of air, anti-foaming agents, thickeners, fillers, stabilizers, preservatives such as biocides, in amounts which can vary considerably, for example, between 0.2 and 50% by weight of the composition.
  • film-forming polymers for example, of the acrylic type, catalysts for the crosslinking reaction, complementary lubricants and anti-friction agents, evacuation of air, anti-foaming agents, thickeners, fillers, stabilizers, preservatives such as biocides, in amounts which can vary considerably, for example, between 0.2 and 50% by weight of the composition.
  • the lubricating composition can be applied using a sprayer, a brush, a sponge, a paint brush or any other means allowing an even layer to be obtained on the surface of the crosslinking bladder. tires.
  • the composition can then be vulcanized on the bladder, either by leaving it to stand for at least 10 hours at room temperature or, advantageously, by subjecting it to the temperatures which are reached during the curing and vulcanization of the carcass of the tire at inside the tire manufacturing device. These temperatures are generally between about 80 ° C and about 180 ° C, vulcanization occurring after 20 minutes or less.
  • the lubricant composition When vulcanization is complete, the lubricant composition continues to adhere to the surface of the bladder during the expansion-contraction sequences, thus making it possible to obtain, with a single application of lubricant, effective lubrication / release during several tire manufacturing cycles. .
  • This example illustrates the lubricant composition of the invention, a composition to which several optional components have been added.
  • the above lubricating composition was prepared by adding together the non-reactive low viscosity polydimethylsiloxane and the polyoxyethylene cetyl stearyl esters, heating to 54.4 ° C and stirring at medium speed for 20 minutes. The hydroxy-terminated polydimethylsiloxane and methyltrimethoxysilane are then added, followed by stirring for 15 minutes. Then 11.7% by weight of the total amount of water is heated to 51.7 ° C and added to the mixture, followed by stirring for 20 minutes. Then, the mixture is cooled to 37.8 ° C, homogenized twice at 17.225.106 Pa, and 22.8% by weight of the total amount of water are added to the mixture, then stirred for 30 minutes at medium speed.
  • the remaining quantity of water is loaded into a separate container, the biocide and the antifoam are added thereto, and the contents of this container are stirred for 10 minutes.
  • the xanthan gum and the polyoxyethylenated isodecyl alcohol are loaded into another container, mixed for 10 minutes, then added to the container containing the water, the biocide and the antifoam. Stirring is continued for 20 minutes, and then hydroxyacetic acid is added, then the non-reactive polydimethylsiloxane of high viscosity and, finally, the homogenized mixture. After stirring the medium for 15 minutes at medium speed, the acrylic latex is added and the mixture is further stirred for 30 minutes.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
  • Lubricants (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Tires In General (AREA)

Abstract

A siloxane-based lubricating composition contains a mixture of unreactive and reactive polydimethylsiloxanes, of crosslinker and of sufficient quantities of surfactant and of water to obtain an emulsion. The composition does not contain any methylhydrosiloxane or dimethylhydrosilane and/or polymethylhydrosiloxane and consequently does not release hydrogen while it is being stored or used.

Description

La présente invention concerne une composition lubrifiante à base de siloxane, et notamment une composition utilisée pour revêtir une vessie de vulcanisation de pneumatiques constituant un élément de l'opération de fabrication des pneumatiques.The present invention relates to a siloxane-based lubricating composition, and in particular a composition used for coating a vulcanization bladder of tires constituting an element of the tire manufacturing operation.

Au cours de la fabrication des pneumatiques en caoutchouc destinés aux véhicules, la mise en forme du pneumatique est obtenue par gonflage d'un sac en caoutchouc, ou vessie de vulcanisation, à l'intérieur d'une carcasse de pneumatique cru, le pneumatique étant ainsi appliqué fortement contre la surface du moule.
En règle générale, il existe un mouvement relatif considérable entre la surface externe de la vessie et la surface interne du pneumatique cru pendant la phase d'expansion de la vessie, avant que le pneu ne soit complètement vulcanisé. De même, il existe aussi un mouvement relatif considérable entre la vessie et le pneumatique vulcanisé après que le pneumatique a été moulé et vulcanisé et que la vessie a été dégonflée et dégagée de la surface interne du pneu pour réduire le frottement entre la vessie et l'intérieur du pneumatique et permettre un glissement optimal de la vessie durant le processus de mise en forme lorsque le pneu brut et la vessie sont en mouvement relatif l'un par rapport à l'autre.During the manufacture of rubber tires intended for vehicles, the shaping of the tire is obtained by inflating a rubber bag, or vulcanization bladder, inside a carcass of a raw tire, the tire being thus applied strongly against the mold surface.
As a rule, there is considerable relative movement between the outer surface of the bladder and the inner surface of the green tire during the expansion phase of the bladder, before the tire is completely vulcanized. Likewise, there is also considerable relative movement between the bladder and the vulcanized tire after the tire has been molded and vulcanized and the bladder has been deflated and released from the inner surface of the tire to reduce friction between the bladder and the tire. inside the tire and allow optimal sliding of the bladder during the shaping process when the raw tire and the bladder are in relative motion with respect to each other.

Le brevet US Re. 32,318 décrit un lubrifiant pour vessie de vulcanisation de pneumatiques destiné à être utilisé comme revêtement à la surface de la vessie. Ledit lubrifiant contient (A) de l'ordre de 20 à 40 parties en poids de polydimethylsiloxane ayant une viscosité cinématique comprise entre environ 1,2.10⁻⁵ et 28 m².s⁻¹ (soit environ 1,2.10⁻² et 28.10³ Pa.s) à 25 °C, (B) de l'ordre de 35 à 70 parties en poids d'au moins un silane choisi parmi (i) un méthylhydrogénosilane ayant une viscosité de l'ordre de 20.10⁻⁶ à 40.10⁻⁶ m².s⁻¹ (soit environ 20.10⁻³ à 40.10⁻³ Pa.s) à 25 °C, (ii) un diméthylhydrogénosilane ayant une viscosité de l'ordre de 8.10⁻⁵ à 12.10⁻⁵ m².s⁻¹ (soit environ 8.10⁻² à 12.10⁻² Pa.s) à 25 °C et (iii) un méthyltriméthoxysilane, (C) éventuellement, de l'ordre de 3 à 2 parties en poids d'un sel métallique d'un acide organique, (D) de l'ordre de 10 à 25 parties en poids d'un ou plusieurs tensio-actifs et (E) de l'ordre de 500 à 1 500 parties en poids d'eau pour réaliser une émulsion ou une dispersion. Le brevet mentionne une préférence pour un polydiméthylsiloxane à teminaison hydroxyle en tant que (A), et pour un mélange de méthylhydrogénosilane et de diméthylhydrogénosilane en tant que (B), dans le lubrifiant ci-dessus.US Patent Re. 32,318 describes a lubricant for a tire vulcanization bladder for use as a coating on the surface of the bladder. Said lubricant contains (A) of the order of 20 to 40 parts by weight of polydimethylsiloxane having a kinematic viscosity of between approximately 1.2.10⁻⁵ and 28 m².s⁻¹ (i.e. approximately 1.2.10⁻² and 28.10³ Pa .s) at 25 ° C, (B) of the order of 35 to 70 parts by weight of at least one silane chosen from (i) a methylhydrogenosilane having a viscosity of the order of 20.10⁻⁶ to 40.10⁻⁶ m².s⁻¹ (about 20.10⁻³ to 40.10⁻³ Pa.s) at 25 ° C, (ii) a dimethylhydrogensilane having a viscosity of the order of 8.10⁻⁵ to 12.10⁻⁵ m².s⁻¹ ( or approximately 8.10⁻² to 12.10⁻² Pa.s) at 25 ° C and (iii) a methyltrimethoxysilane, (C) optionally, of the order of 3 to 2 parts by weight of a metal salt of an organic acid , (D) of the order of 10 to 25 parts by weight of one or more surfactants and (E) of the order of 500 to 1500 parts by weight of water to produce an emulsion or a dispersion. The patent mentions a preference for a hydroxyl-terminated polydimethylsiloxane as (A), and for a mixture of methylhydrogenosilane and dimethylhydrogenosilane as (B), in the above lubricant.

Si le lubrifiant à base de méthylhydrogénosilane, décrit dans le brevet US Re. 32,318, s'est révélé efficace dans les applications envisagées, on a observé durant son stockage et/ou son utilisation dans l'opération de vulcanisation des pneumatiques, un dégagement d'hydrogène éventuellement dangereux, résultant de la décomposition du méthylhydrogénosilane présent.If the methylhydrogenosilane-based lubricant described in US Patent Re. 32,318 has proved effective in the envisaged applications, during its storage and / or use in the vulcanization operation of the tires, a release of possibly dangerous hydrogen, resulting from the decomposition of the methylhydrogensilane present.

EXPOSE DE L'INVENTIONSTATEMENT OF THE INVENTION

On a trouvé que si l'on supprime la présence de méthylhydrogénosilane, de diméthylhydrogénosilane et/ou de polyméthylhydrogénosilane, et si l'on met en oeuvre un mélange de polydiméthylsiloxanes non réactifs et réactifs conjointement avec une petite quantité de réticulant, on obtient une composition lubrifiante bien adaptée à l'utilisation comme revêtement de dégagement de vessie de moulage des pneumatiques, ne libérant pas d'hydrogène au stockage et/ou à l'utilisation, et présentant, au cours de la vulcanisation, des propriétés efficaces et durables de lubrification/dégagement entre les surfaces en contact.It has been found that if the presence of methylhydrogenosilane, dimethylhydrogenosilane and / or polymethylhydrogenosilane is eliminated, and if a mixture of non-reactive and reactive polydimethylsiloxanes is used together with a small amount of crosslinker, a composition is obtained. lubricant well suited for use as a bladder release coating for molding tires, not releasing hydrogen during storage and / or use, and exhibiting, during vulcanization, effective and lasting lubricating properties / clearance between the surfaces in contact.

Ainsi selon la présente invention, on propose une composition lubrifiante ne dégageant pas d'hydrogène, ne contenant ni méthylhydrogénosilane, ni diméthylhydrogénosilane et/ou polyméthyl hydrogénosiloxane, et comprenant :

  • (a) au moins un polydiméthylsiloxane non réactif ayant une viscosité cinématique de l'ordre de 5.10⁻⁵ à 30 m².s⁻¹ (soit environ 5.10⁻² à 30.10³ Pa.s) à 25 °C,
  • (b) au moins un polydiméthylsiloxane réactif ayant une viscosité cinématique de l'ordre de 1,5.10⁻⁵ à 5 m².s⁻¹ (soit environ 1,5.10⁻² à 5.10³ Pa.s) à 25°C,
  • (c) au moins un réticulant,
  • (d) au moins un tensio-actif et
  • (e) de l'eau,

ladite composition lubrifiante contenant une quantité de polydiméthylsiloxane non réactif (a) de l'ordre de 20 à 95 % en poids par rapport au mélange de polydiméthylsiloxane non réactif (a) et de polydiméthylsiloxane réactif (b), une quantité de polydiméthylsiloxane réactif (b) de l'ordre de 5 à 80 % en poids par rapport au mélange de polydiméthylsiloxane non réactif (a) et de polydiméthylsiloxane réactif (b), une quantité de réticulant (c) de l'ordre de 0,01 à 5 % en poids par rapport au polydiméthylsiloxane réactif (b), et une quantité suffisante de tensio-actif (d) et d'eau (e) pour obtenir une émulsion.Thus according to the present invention, there is provided a lubricating composition which does not release hydrogen, containing neither methylhydrogenosilane, nor dimethylhydrogenosilane and / or polymethylhydrogenosiloxane, and comprising:
  • (a) at least one non-reactive polydimethylsiloxane having a kinematic viscosity of the order of 5.10⁻⁵ to 30 m².s⁻¹ (or approximately 5.10⁻² to 30.10³ Pa.s) at 25 ° C,
  • (b) at least one reactive polydimethylsiloxane having a kinematic viscosity of the order of 1.5 × 10⁻⁵ to 5 m².s⁻¹ (or approximately 1.5 × 10⁻² to 5.10³ Pa.s) at 25 ° C,
  • (c) at least one crosslinker,
  • (d) at least one surfactant and
  • (e) water,

said lubricating composition containing an amount of non-reactive polydimethylsiloxane (a) of the order of 20 to 95% by weight relative to the mixture of non-reactive polydimethylsiloxane (a) and reactive polydimethylsiloxane (b), an amount of reactive polydimethylsiloxane (b ) of the order of 5 to 80% by weight relative to the mixture of non-reactive polydimethylsiloxane (a) and reactive polydimethylsiloxane (b), an amount of crosslinking agent (c) of the order of 0.01 to 5% by weight relative to the reactive polydimethylsiloxane (b), and a sufficient amount of surfactant (d) and water (e) to obtain an emulsion.

Dans la formulation ci-dessus, le polydiméthylsiloxane non réactif (a) et le polydiméthylsiloxane réactif (b) doivent être présents ensemble, afin que l'on obtienne une composition lubrifiante possédant des propriétés de lubrification/dégagement et de durabilité efficaces, étant entendu que cette dernière propriété consiste en la capacité, en une seule application de composition lubrifiante, d'obtenir une lubrification/dégagement efficace pendant plusieurs cycles de fabrication de pneumatiques, par exemple, jusqu'à cinq cycles, sans avoir à procéder à une nouvelle application de composition lubrifiante.In the above formulation, the non-reactive polydimethylsiloxane (a) and the reactive polydimethylsiloxane (b) must be present together, in order to obtain a lubricating composition having effective lubrication / release and durability properties, it being understood that this last property consists of capacity, in a single application of lubricant composition, to obtain effective lubrication / release during several tire manufacturing cycles, for example, up to five cycles, without having to make a new application of lubricant composition.

DESCRIPTION DES MODES DE REALISATION PREFERENTIELSDESCRIPTION OF THE PREFERENTIAL EMBODIMENTS

Le polydiméthylsiloxane non réactif (a) possède une viscosité de l'ordre de 5.10⁻⁵ à 30 m².s⁻¹ (soit environ 5.10⁻² à 30.10³ Pa.s) et est avantageusement constitué d'un mélange de polydiméthylsiloxane(s) non réactifs (i) de haute viscosité contribuant à assurer la durabilité de la composition lubrifiante et de polydiméthylsiloxane(s) non réactifs (ii) de moyenne viscosité contribuant à assurer son pouvoir lubrifiant. Si le polydiméthylsiloxane non réactif (a) est constitué d'un tel mélange, le siloxane de haute viscosité (i) possédera généralement une viscosité d'au moins 10⁻¹ m²·s⁻¹ (soit au moins environ 10² Pa.s), et de préférence de l'ordre de 10 à 25 m².s⁻¹ (soit environ 10.10³ à 25.10³ Pa.s) à 25°C et le siloxane de faible à moyenne viscosité (ii) présentera généralement une viscosité inférieure à 10⁻¹ m².s⁻¹ (soit inférieure environ à 10² Pa.s) à 25°C, par exemple de l'ordre de 5.10⁻⁵ à 20.10⁻⁵ m².s⁻¹ (soit environ 5.10⁻² à 20.10⁻² Pa.s) à 25°C dans le cas d'un siloxane de faible viscosité et de l'ordre de 10⁻² à 5.10⁻² m².s⁻¹ (soit environ 10 à 50 Pa.s) à 25°C dans le cas d'un siloxane de moyenne viscosité. Il va de soi que l'on peut utiliser aussi comme composant polydiméthylsiloxane non réactif (ii) des mélanges de siloxanes de faible et de moyenne viscosité. Le rapport pondéral entre le(s) polydiméthylsiloxane(s) de haute viscosité (i) et le(s) polyméthylsiloxane(s) de viscosité faible à moyenne peut varier entre environ 1 : 10 et environ 10 : 1, de préférence entre environ 1 : 5 et environ 5 : 1. La composition lubrifiante contiendra de l'ordre de 20 à 95 %, de préférence de l'ordre de 40 à 75 %, en poids de polydiméthylsiloxane(s) non réactif(s) (a) par rapport au poids total de polydiméthylsiloxane (a) non réactif et de polydiméthylsiloxane (b) réactif.The non-reactive polydimethylsiloxane (a) has a viscosity of the order of 5.10⁻⁵ to 30 m².s⁻¹ (or about 5.10⁻² to 30.10³ Pa.s) and is advantageously made up of a mixture of polydimethylsiloxane (s ) non-reactive (i) of high viscosity helping to ensure the durability of the lubricating composition and non-reactive polydimethylsiloxane (s) (ii) of medium viscosity helping to ensure its lubricating power. If the non-reactive polydimethylsiloxane (a) consists of such a mixture, the high viscosity siloxane (i) will generally have a viscosity of at least 10⁻¹ m² · s⁻¹ (or at least about 10² Pa.s) , and preferably of the order of 10 to 25 m².s⁻¹ (or about 10.10³ to 25.10³ Pa.s) at 25 ° C and the low to medium viscosity siloxane (ii) will generally have a viscosity of less than 10⁻¹ m².s⁻¹ (i.e. less than approximately 10² Pa.s) at 25 ° C, for example of the order of 5.10⁻⁵ to 20.10⁻⁵ m².s⁻¹ (i.e. approximately 5.10⁻² to 20.10 ⁻² Pa.s) at 25 ° C in the case of a siloxane of low viscosity and of the order of 10⁻² to 5.10⁻² m².s⁻¹ (or approximately 10 to 50 Pa.s) at 25 ° C in the case of a medium viscosity siloxane. It goes without saying that it is also possible to use, as non-reactive polydimethylsiloxane component (ii) mixtures of low and medium viscosity siloxanes. The weight ratio between the polydimethylsiloxane (s) of high viscosity (i) and the polymethylsiloxane (s) of low to medium viscosity can vary between approximately 1: 10 and approximately 10: 1, preferably between approximately 1 : 5 and about 5: 1. The lubricating composition will contain around 20 to 95%, preferably around 40 to 75%, by weight of non-reactive polydimethylsiloxane (s) (a) by based on the total weight of non-reactive polydimethylsiloxane (a) and reactive polydimethylsiloxane (b).

Les polydiméthylsiloxanes non réactifs de haute viscosité (i) spécifiques que l'on peut utiliser, comprennent le Rhodorsil Emulsion M-405 de Rhône-Poulenc Inc. qui est une émulsion siloxane dont le composant siloxane présente une viscosité nominale supérieure à 10⁻¹ m².s⁻¹ (soit supérieure à environ 10² Pa.s) à 25°C, le Silicone 2068 de General Electric Co. qui est une émulsion siloxane dont le composant siloxane présente une viscosité nominale supérieure à 10⁻¹ m².s⁻¹ (soit supérieure à environ 10² Pa.s) à 25°C, le L45-300,000 de Union Carbide qui a une viscosité nominale de 3.10⁻¹ m².s⁻¹ (soit environ 3.102 Pa.s) à 25°C et le PS050 de Hüls America Inc. qui présente une viscosité nominale de 2,5 m².s⁻¹ (soit environ 2,5.10³ Pa.s) à 25°C.Non-reactive, high viscosity (i) specific polydimethylsiloxanes which can be used include Rhodorsil Emulsion M-405 from Rhône-Poulenc Inc. which is a siloxane emulsion whose siloxane component has a nominal viscosity greater than 10⁻¹ m² .s⁻¹ (ie greater than approximately 10² Pa.s) at 25 ° C., Silicone 2068 from General Electric Co. which is a siloxane emulsion whose siloxane component has a nominal viscosity greater than 10⁻¹ m².s⁻¹ (i.e. greater than approximately 10² Pa.s) at 25 ° C, Union Carbide's L45-300,000 which has a nominal viscosity of 3.10⁻¹ m².s⁻¹ (i.e. approximately 3.102 Pa.s) at 25 ° C and PS050 from Hüls America Inc. which has a nominal viscosity of 2.5 m².s⁻¹ (or approximately 2.5.10³ Pa.s) at 25 ° C.

Les polydiméthylsiloxanes non réactifs de faible à moyenne viscosité (ii) spécifiques que l'on peut utiliser comprennent le Rhodorsil Fluid H47V100 de Rhône-Poulenc Inc. qui possède une viscosité nominale de 10⁻⁴ m².s⁻¹ (soit environ 10⁻¹ Pa.s) à 25°C, le PS041 et le PS047 de Hüls America Inc. qui possèdent respectivement des viscosités nominales de 10⁻⁴ et 3.10⁻² m².s⁻¹ (soit environ de 10⁻¹ et 30 Pa.s) à 25°C, le Dow 200 de Dow-Corning Corp. qui a une viscosité nominale de 2.10⁻⁴ m².s⁻¹ (soit environ 2.10⁻¹ Pa.s) à 25 °C et le L45-100 de Union Carbide Corp. qui présente une viscosité nominale de 10⁻⁴ m².s⁻¹ (soit environ 10⁻¹ Pa.s) à 25°C.The specific non reactive low to medium viscosity (ii) polydimethylsiloxanes that can be used include Rhodorsil Fluid H47V100 from Rhône-Poulenc Inc. which has a nominal viscosity of 10⁻⁴ m².s⁻¹ (or about 10⁻¹ Pa.s) at 25 ° C, PS041 and PS047 from Hüls America Inc. which have nominal viscosities of 10⁻⁴ and 3.10⁻² m².s⁻¹ respectively (i.e. approximately 10⁻¹ and 30 Pa.s ) at 25 ° C, the Dow 200 from Dow-Corning Corp. which has a nominal viscosity of 2.10⁻⁴ m².s⁻¹ (or about 2.10⁻¹ Pa.s) at 25 ° C and the L45-100 from Union Carbide Corp. which has a nominal viscosity of 10⁻⁴ m².s⁻¹ (or about 10⁻¹ Pa.s) at 25 ° C.

Le composant polydiméthylsiloxane réactif (b) peut être choisi parmi n'importe lequel des polydiméthylsiloxanes à terminaison hydroxyle et/ou alcoxy ayant une viscosité de l'ordre de 1,5.10⁻⁵ à 5 m².s⁻¹ (soit environ 1,5.10⁻² à 5.10³ Pa.s), de préférence de l'ordre de 5.10⁻⁵ à 10⁻² m².s⁻¹ (soit environ de 5.10⁻² à 10 Pa.s) à 25°C. Les polydiméthylsiloxanes réactifs (b) spécifiques que l'on peut utiliser en obtenant des résultats généralement bons comprennent les polydiméthylsiloxanes à terminaison hydroxyle L-9000 de Union Carbide Corp. [10⁻³ m².s⁻¹ (soit environ 1 Pa.s) à 25°C], PS-340, PS-343.8 et PS-349.5 de Hüls America, Inc. [respectivement 1,5.10⁻⁵ - 3,5.10⁻⁵ m².s⁻¹ (soit environ 1,5.10⁻² - 3,5.10⁻² Pa.s), 3,5.10⁻³ m².s⁻¹ (soit environ 3,5 Pa.s) et 0,8 - 1,2 m².s⁻¹ (soit environ 0,8.10³ - 1,2.10³ Pa.s) à 25°C], DCQ13563, DCQ-7132 et DC-109 de Dow Corning Corp. [respectivement 10⁻⁴ m².s⁻¹ (soit environ 10⁻¹ Pa.s), 1,8.10⁻³ m².s⁻¹ (soit environ 1,8 Pa.s) et 5.10⁻³ m².s⁻¹ (soit environ 5 Pa.s) à 25°C], ainsi que les combinaisons de ceux-ci avec des polydiméthylsiloxanes réactifs similaires. En général, le composant polydiméthylsiloxane réactif (b), peut être présent à raison de l'ordre de 5 à 80, de préférence de l'ordre de 25 à 60 % en poids par rapport au mélange de polydiméthylsiloxane(s) non réactif(s) (a) et de polydiméthylsiloxane(s) réactif(s) (b).The reactive polydimethylsiloxane component (b) can be chosen from any of the hydroxyl-terminated and / or alkoxy-terminated polydimethylsiloxanes having a viscosity of the order of 1.5.10⁻⁵ to 5 m².s⁻¹ (or about 1.5.10 ⁻² to 5.10³ Pa.s), preferably of the order of 5.10⁻⁵ to 10⁻² m².s⁻¹ (or approximately 5.10⁻² to 10 Pa.s) at 25 ° C. The specific reactive polydimethylsiloxanes (b) that can be used to obtain generally good results include the hydroxyl-terminated polydimethylsiloxanes L-9000 from Union Carbide Corp. [10⁻³ m².s⁻¹ (about 1 Pa.s) at 25 ° C], PS-340, PS-343.8 and PS-349.5 from Hüls America, Inc. [respectively 1.5.10⁻⁵ - 3, 5.10⁻⁵ m².s⁻¹ (i.e. approximately 1.5.10⁻² - 3.5.10⁻² Pa.s), 3.5.10⁻³ m².s⁻¹ (i.e. approximately 3.5 Pa.s) and 0, 8 - 1.2 m².s⁻¹ (about 0.8.10³ - 1.2.10³ Pa.s) at 25 ° C], DCQ13563, DCQ-7132 and DC-109 from Dow Corning Corp. [respectively 10⁻⁴ m².s⁻¹ (about 10⁻¹ Pa.s), 1.8.10⁻³ m².s⁻¹ (about 1.8 Pa.s) and 5.10⁻³ m².s⁻¹ (ie about 5 Pa.s) at 25 ° C], as well as the combinations of these with similar reactive polydimethylsiloxanes. In general, the reactive polydimethylsiloxane component (b) can be present in the range of 5 to 80, preferably in the range of 25 to 60% by weight relative to the mixture of non-reactive polydimethylsiloxane (s) ( s) (a) and reactive polydimethylsiloxane (s) (b).

Le composant réticulant (c) peut être choisi parmi n'importe lequel des composés classiques connus utilisés pour réticuler le composant polydiméthylsiloxane réactif (b), comme par exemple ceux décrits dans le brevet US 4 889 770 et dont le contenu est ici incorporé par référence. Les réticulants connus et classiques comprennent les organotrialcoxysilanes, les organotriacyloxysilanes, les organotrioximesilanes et les tétraalkylsilicates. On préfère utiliser ici les alkyltrialcoxysilanes et, parmi ceux-ci, plus particulièrement le méthyltriméthoxysilane.The crosslinking component (c) can be chosen from any of the known conventional compounds used to crosslink the reactive polydimethylsiloxane component (b), such as for example those described in US Pat. No. 4,889,770 and the content of which is incorporated herein by reference . Known and conventional crosslinkers include organotrialcoxysilanes, organotriacyloxysilanes, organotrioximesilanes and tetraalkylsilicates. It is preferred to use here the alkyltrialkoxysilanes and, among these, more particularly methyltrimethoxysilane.

Dès que la composition lubrifiante est appliquée sur la vessie de réticulation des pneumatiques (ou sur toute autre surface), le composant réticulant (c) réagit avec les groupes hydroxyle et/ou alcoxy terminaux du composant polydiméthylsiloxane réactif (b) pour réticuler ce dernier et donner un film adhérent. La réaction de réticulation ne nécessite que de petites quantités de réticulant, par exemple de l'ordre de 0,01 à 5, de préférence de l'ordre de 0,02 à 2 % en poids par rapport au polydiméthylsiloxane réactif (b), et peut se faire avec ou sans ajout de catalyseur (bien que la réaction puisse être, dans certains cas, catalysée par un composant de la vessie de vulcanisation des pneumatiques sur laquelle on applique la composition lubrifiante).As soon as the lubricating composition is applied to the crosslinking bladder of the tires (or to any other surface), the crosslinking component (c) reacts with the terminal hydroxyl and / or alkoxy groups of the reactive polydimethylsiloxane component (b) to crosslink the latter and give an adherent film. The crosslinking reaction does not requires only small amounts of crosslinker, for example of the order of 0.01 to 5, preferably of the order of 0.02 to 2% by weight relative to the reactive polydimethylsiloxane (b), and can be done with or without addition of catalyst (although the reaction may, in certain cases, be catalyzed by a component of the tire vulcanization bladder to which the lubricant composition is applied).

On peut mettre en oeuvre ici n'importe lesquels des tensio-actifs utilisés jusqu'à présent dans la fabrication d'une composition adhésive pour vessie de réticulation de pneumatiques. Des exemples de tensio-actifs appropriés que l'on peut mettre en oeuvre dans les compositions adhésive de la présente invention sont les tensio-actifs anioniques, cationiques et non ioniques tels que les alkyl ou arylpolyglycoléthers ou les alkylphénols tels que les alkyl phénols polyoxyéthylénés, I'hexastéarate de sorbitan polyoxyéthyléné , le polyoxyéthylène isodécyl éther, le triméthylnonyl éther de polyéthylèneglycol contenant de 3 à 15 unités d'oxyde d'éthylène par molécule, I'oléate de sorbitan polyoxyéthyléné ayant un indice de saponification de 102 à 108 et un indice d'hydroxyle de 25 à 35, les polyoxyéthylène cétylstéaryléthers, etc.Any of the surfactants used up to now in the manufacture of an adhesive composition for tire crosslinking bladders can be used here. Examples of suitable surfactants which can be used in the adhesive compositions of the present invention are anionic, cationic and nonionic surfactants such as alkyl or arylpolyglycol ethers or alkylphenols such as polyoxyethylenated alkyl phenols, Polyoxyethylene sorbitan hexastearate, polyoxyethylene isodecyl ether, polyethylene glycol trimethylnonyl ether containing 3 to 15 units of ethylene oxide per molecule, polyoxyethylene sorbitan oleate having a saponification index of 102 to 108 and an index from 25 to 35 hydroxyl, polyoxyethylene cetylstearyl ethers, etc.

Les quantités de tensio-actif et d'eau mises en oeuvre peuvent varier considérablement pourvu que, bien évidemment, l'on obtienne une émulsion. Les émulsions stables peuvent contenir de l'ordre de 2 à 50, de préférence de 5 à 40 % en poids de mélange des composants (a), (b) et (c), de l'ordre à 0,5 à 5, de préférence de l'ordre de 1 à 4 % en poids de tensio-actif(s) (d) et de l'ordre de 50 à 95, de préférence de l'ordre de 60 à 90 % en poids d'eau. L'émulsion aqueuse peut être préparée aisément en mettant en oeuvre les procédés et un appareillage connus et classiques.The amounts of surfactant and water used can vary considerably provided that, of course, an emulsion is obtained. The stable emulsions may contain on the order of 2 to 50, preferably 5 to 40% by weight of mixture of components (a), (b) and (c), on the order of 0.5 to 5, preferably of the order of 1 to 4% by weight of surfactant (s) (d) and of the order of 50 to 95, preferably of the order of 60 to 90% by weight of water. The aqueous emulsion can be easily prepared using known and conventional methods and apparatus.

La composition lubrifiante selon la présente invention peut contenir aussi un ou plusieurs ingrédients facultatifs tels que des polymères filmogènes , par exemple, du type acrylique, des catalyseurs pour la réaction de réticulation, des lubrifiants complémentaires et des agents anti-friction, des agents d'évacuation de l'air, des agents anti-mousse, des épaississants, des charges, des stabilisants, des conservateurs tels que des biocides, en quantités pouvant varier considérablement, par exemple, entre 0,2 et 50 % en poids de la composition.The lubricant composition according to the present invention may also contain one or more optional ingredients such as film-forming polymers, for example, of the acrylic type, catalysts for the crosslinking reaction, complementary lubricants and anti-friction agents, evacuation of air, anti-foaming agents, thickeners, fillers, stabilizers, preservatives such as biocides, in amounts which can vary considerably, for example, between 0.2 and 50% by weight of the composition.

On peut appliquer la composition lubrifiante à l'aide d'un pulvérisateur, d'une brosse, d'une éponge, d'un pinceau ou de toute autre moyen permettant d'obtenir une couche régulière à la surface de la vessie de réticulation de pneumatiques. On peut alors vulcaniser la composition sur la vessie, soit en la laissant reposer pendant au moins 10 heures à température ambiante ou, avantageusement, en la soumettant aux températures que l'on atteint durant la cuisson et la vulcanisation de la carcasse du pneumatique à l'intérieur de l'appareil de fabrication du pneumatique. Ces températures sont généralement comprises entre envriron 80°C et environ 180°C, la vulcanisation intervenant au bout de 20 minutes ou moins. Lorsque la vulcanisation est terminée, la composition lubrifiante continue d'adhérer à la surface de la vessie pendant les séquences d'expansion-contraction permettant ainsi d'obtenir avec une seule application de lubrifiant une lubrification/dégagement efficace pendant plusieurs cycles de fabrication de pneumatiques.The lubricating composition can be applied using a sprayer, a brush, a sponge, a paint brush or any other means allowing an even layer to be obtained on the surface of the crosslinking bladder. tires. The composition can then be vulcanized on the bladder, either by leaving it to stand for at least 10 hours at room temperature or, advantageously, by subjecting it to the temperatures which are reached during the curing and vulcanization of the carcass of the tire at inside the tire manufacturing device. These temperatures are generally between about 80 ° C and about 180 ° C, vulcanization occurring after 20 minutes or less. When vulcanization is complete, the lubricant composition continues to adhere to the surface of the bladder during the expansion-contraction sequences, thus making it possible to obtain, with a single application of lubricant, effective lubrication / release during several tire manufacturing cycles. .

Les exemples suivants illustrent les compositions lubrifiantes selon la présente invention pour vessies de vulcanisation de pneumatiques.The following examples illustrate the lubricant compositions according to the present invention for tire vulcanization bladders.

EXEMPLE 1EXAMPLE 1

Cet exemple illustre la composition lubrifiante de l'invention, composition à laquelle ont été ajoutés plusieurs composants facultatifs.

Figure imgb0001
This example illustrates the lubricant composition of the invention, a composition to which several optional components have been added.
Figure imgb0001

La composition lubrifiante ci-dessus a été préparée en ajoutant ensemble le polydiméthylsiloxane non réactif de faible viscosité et les cétyl-stéarylesters de polyoxyéthylène, en chauffant à 54,4°C et en agitant à vitesse moyenne pendant 20 minutes. Le polydiméthylsiloxane à terminaison hydroxy et le méthyltriméthoxysilane sont alors ajoutés, puis on agite pendant 15 minutes. Ensuite, 11,7 % en poids de la quantité totale d'eau sont chauffés à 51,7°C et ajoutés au mélange, puis on continue l'agitation pendant 20 minutes. Ensuite, le mélange est refroidi à 37,8°C, homogénéisé deux fois à 17,225.10⁶ Pa, et 22,8 % en poids de la quantité totale d'eau sont ajoutés au mélange, puis on agite pendant 30 minutes à vitesse moyenne. La quantité d'eau restante est chargée dans un récipient séparé, on y ajoute le biocide et l'anti-mousse, et on agite le contenu de ce récipient pendant 10 minutes. La gomme xanthane et l'alcool isodécylique polyoxyéthyléné sont chargés dans un autre récipient, mélangés pendant 10 minutes, puis ajoutés au récipient contenant l'eau, le biocide et l'anti-mousse. On agite encore pendant 20 minutes, et on ajoute alors l'acide hydroxyacétique, puis le polydiméthylsiloxane non réactif de haute viscosité et, enfin, le mélange homogénéisé. Après agitation du milieu pendant 15 minutes à vitesse moyenne, on ajoute le latex acrylique et on agite encore pendant 30 minutes.The above lubricating composition was prepared by adding together the non-reactive low viscosity polydimethylsiloxane and the polyoxyethylene cetyl stearyl esters, heating to 54.4 ° C and stirring at medium speed for 20 minutes. The hydroxy-terminated polydimethylsiloxane and methyltrimethoxysilane are then added, followed by stirring for 15 minutes. Then 11.7% by weight of the total amount of water is heated to 51.7 ° C and added to the mixture, followed by stirring for 20 minutes. Then, the mixture is cooled to 37.8 ° C, homogenized twice at 17.225.10⁶ Pa, and 22.8% by weight of the total amount of water are added to the mixture, then stirred for 30 minutes at medium speed. The remaining quantity of water is loaded into a separate container, the biocide and the antifoam are added thereto, and the contents of this container are stirred for 10 minutes. The xanthan gum and the polyoxyethylenated isodecyl alcohol are loaded into another container, mixed for 10 minutes, then added to the container containing the water, the biocide and the antifoam. Stirring is continued for 20 minutes, and then hydroxyacetic acid is added, then the non-reactive polydimethylsiloxane of high viscosity and, finally, the homogenized mixture. After stirring the medium for 15 minutes at medium speed, the acrylic latex is added and the mixture is further stirred for 30 minutes.

EXEMPLE 2EXAMPLE 2

On utilise substantiellement le même mode opératoire que celui décrit dans l'exemple 1 pour préparer la composition lubrifiante suivante :

Figure imgb0002
The same procedure as that described in Example 1 is used substantially to prepare the following lubricating composition:
Figure imgb0002

Claims (15)

Composition lubrifiante à base de siloxane ne dégageant pas d'hydrogène, ne contenant ni méthylhydrogénosilane, ni diméthylhydrogénosilane et/ou polyméthylhydrogénosiloxane, comprenant : (a) au moins un polydiméthylsiloxane non réactif ayant une viscosité de l'ordre de 5.10⁻⁵ à 30 m².s⁻¹ (soit environ 5.10⁻² à 30.10³ Pa.s) à 25°C ; (b) au moins un polydiméthylsiloxane réactif ayant une viscosité de l'ordre de 1,5.10⁻⁵ à 5 m².s⁻¹ (soit environ 1,5.10⁻² à 5.10³ Pa.s) à 25°C ; (c) au moins un réticulant; (d) au moins un tensio-actif et (e) de l'eau, ladite composition lubrifiante contenant une quantité de polydiméthylsiloxane non réactif (a) de l'ordre de 20 à 95 % en poids par rapport au mélange de polydiméthylsiloxane non réactif (a) et de polydiméthylsiloxane réactif (b), une quantité de polydiméthylsiloxane réactif (b) de l'ordre de 5 à 80 % en poids par rapport au mélange de polydiméthylsiloxane non réactif (a) et de polydiméthylsiloxane réactif (b), une quantité de réticulant (c) de l'ordre de 0,01 à 5 % en poids par rapport au polydiméthylsiloxane réactif (b) et une quantité suffisante de tensio-actif (d) et d'eau (e) pour obtenir une émulsion.Lubricating composition based on siloxane which does not release hydrogen, containing neither methylhydrogenosilane, nor dimethylhydrogenosilane and / or polymethylhydrogenosiloxane, comprising: (a) at least one non-reactive polydimethylsiloxane having a viscosity of the order of 5.10⁻⁵ to 30 m².s⁻¹ (or about 5.10⁻² to 30.10³ Pa.s) at 25 ° C; (b) at least one reactive polydimethylsiloxane having a viscosity of the order of 1.5 × 10⁻⁵ to 5 m².s⁻¹ (or approximately 1.5 × 10⁻² to 5.10³ Pa.s) at 25 ° C; (c) at least one crosslinker; (d) at least one surfactant and (e) water, said lubricating composition containing an amount of non-reactive polydimethylsiloxane (a) of the order of 20 to 95% by weight relative to the mixture of non-reactive polydimethylsiloxane (a) and reactive polydimethylsiloxane (b), an amount of reactive polydimethylsiloxane (b ) of the order of 5 to 80% by weight relative to the mixture of non-reactive polydimethylsiloxane (a) and reactive polydimethylsiloxane (b), an amount of crosslinking agent (c) of the order of 0.01 to 5% by weight relative to the reactive polydimethylsiloxane (b) and a sufficient amount of surfactant (d) and water (e) to obtain an emulsion. Composition lubrifiante selon la revendication 1, dans laquelle le polydiméthylsiloxane non réactif (a) contient au moins un polydiméthylsiloxane non réactif (i) ayant une viscosité d'au moins 10⁻¹ m².s⁻¹ (soit d'au moins environ 10² Pa.s) à 25°C et au moins un polydiméthylsiloxane non réactif (ii) ayant une viscosité inférieure à 10⁻¹ m².s⁻¹ (soit inférieure à environ 10² Pa.s) à 25°C.Lubricant composition according to claim 1, in which the non-reactive polydimethylsiloxane (a) contains at least one non-reactive polydimethylsiloxane (i) having a viscosity of at least 10⁻¹ m².s⁻¹ (or at least about 10² Pa .s) at 25 ° C and at least one non-reactive polydimethylsiloxane (ii) having a viscosity less than 10⁻¹ m².s⁻¹ (or less than about 10² Pa.s) at 25 ° C. Composition lubrifiante selon la revendication 2, dans laquelle le polydiméthylsiloxane non réactif (i) possède une viscosité de l'ordre de 10 à 25 m².s⁻¹ (soit environ 10.10³ à 25.10³ Pa.s) à 25°C et le polydiméthylsiloxane non réactif (ii) est choisi dans le groupe constitué par les polydiméthylsiloxanes non réactifs ayant une viscosité de l'ordre de 5.10⁻⁵ à 20.10⁻⁵ m².s⁻¹ (soit environ 5.10⁻² à 20.10⁻² Pa.s) à 25°C, les polydiméthylsiloxanes non réactifs ayant une viscosité de l'ordre de 10⁻² à 5.10⁻² m².s⁻¹ (soit environ 10 à 50 Pa.s) à 25°C et leurs combinaisons.Lubricant composition according to claim 2, in which the non-reactive polydimethylsiloxane (i) has a viscosity of the order of 10 to 25 m².s⁻¹ (or about 10.10³ to 25.10³ Pa.s) at 25 ° C and the non-reactive polydimethylsiloxane (ii) is chosen from the group consisting of non-reactive polydimethylsiloxanes having a viscosity of the order of 5.10⁻⁵ to 20.10⁻⁵ m².s⁻¹ (or approximately 5.10⁻² to 20.10⁻² Pa.s ) at 25 ° C, non-reactive polydimethylsiloxanes having a viscosity of the order of 10⁻² to 5.10⁻² m².s⁻¹ (or about 10 to 50 Pa.s) at 25 ° C and their combinations. Composition lubrifiante selon la revendication 2, dans laquelle le rapport en poids du polydiméthylsiloxane non réactif (i) au polydiméthylsiloxane non réactif (ii) est de l'ordre de 1: 10 à 10 : 1.The lubricant composition of claim 2, wherein the weight ratio of the non-reactive polydimethylsiloxane (i) to the non-reactive polydimethylsiloxane (ii) is in the range of 1: 10 to 10: 1. Composition lubrifiante selon la revendication 2, dans laquelle le rapport en poids du polydiméthylsiloxane non réactif (i) au polydiméthylsiloxane non réactif (ii) est de l'ordre de 1 : 5 à 5 : 1.The lubricant composition of claim 2, wherein the weight ratio of the non-reactive polydimethylsiloxane (i) to the non-reactive polydimethylsiloxane (ii) is in the range of 1: 5 to 5: 1. Composition lubrifiante selon la revendication 3, dans laquelle le rapport en poids du polydiméthylsiloxane non réactif (i) au polydiméthylsiloxane non réactif (ii) est de l'ordre de 1 : 10 à à 10 : 1.The lubricant composition of claim 3, wherein the weight ratio of the non-reactive polydimethylsiloxane (i) to the non-reactive polydimethylsiloxane (ii) is in the range of 1: 10 to 10: 1. Composition lubrifiante selon la revendication 3, dans laquelle le rapport en poids du polydiméthylsiloxane non réactif (i) au polydiméthylsiloxane non réactif (ii) est de l'ordre de 1 : 5 à 5 : 1.The lubricant composition of claim 3, wherein the weight ratio of the non-reactive polydimethylsiloxane (i) to the non-reactive polydimethylsiloxane (ii) is in the range of 1: 5 to 5: 1. Composition lubrifiante selon la revendication 1, dans laquelle le réticulant (c) possède une viscosité de l'ordre de 5.10⁻⁵ à 10⁻² m².s⁻¹ (soit environ 5.10⁻² à 10 Pa.s) à 25°C.Lubricant composition according to claim 1, in which the crosslinking agent (c) has a viscosity of the order of 5.10⁻⁵ to 10⁻² m².s⁻¹ (or approximately 5.10⁻² at 10 Pa.s) at 25 ° C . Composition lubrifiante selon la revendication 1 dans laquelle le réticulant (c) est choisi dans le groupe constitué par les organotrialcoxysilanes, les organotriacyloxysilanes, les organotrioximesilanes, les tétraalkylsilicates et leurs combinaisons.Lubricant composition according to Claim 1, in which the crosslinking agent (c) is chosen from the group consisting of organotrialcoxysilanes, organotriacyloxysilanes, organotrioximesilanes, tetraalkylsilicates and combinations thereof. Composition lubrifiante selon la revendication 1, dans laquelle le réticulant (c) est le méthyltriméthoxysilane.The lubricant composition according to claim 1, wherein the crosslinker (c) is methyltrimethoxysilane. Composition lubrifiante selon la revendication 1, dans laquelle la quantité de polydiméthylsiloxane non réactif (a) est de l'ordre de 40 à 75 % en poids par rapport au mélange de polydiméthylsiloxane non réactif (a) et de polydiméthylsiloxane réactif (b), la quantité de polydiméthylsiloxane réactif (b) est de l'ordre de 25 à 60 % en poids par rapport au mélange de polydiméthylsiloxane non réactif (a) et de polydiméthylsiloxane réactif (b), la quantité de réticulant (c) est de l'ordre de 0,02 à 2 % en poids par rapport au polydiméthylsiloxane réactif (b).Lubricant composition according to claim 1, in which the amount of non-reactive polydimethylsiloxane (a) is of the order of 40 to 75% by weight relative to the mixture of non-reactive polydimethylsiloxane (a) and reactive polydimethylsiloxane (b), the amount of reactive polydimethylsiloxane (b) is of the order of 25 to 60% by weight relative to the mixture of non-reactive polydimethylsiloxane (a) and reactive polydimethylsiloxane (b), the amount of crosslinking agent (c) is of the order from 0.02 to 2% by weight relative to the reactive polydimethylsiloxane (b). Composition lubrifiante selon la revendication 1, contenant un polymère filmogène.Lubricant composition according to claim 1, containing a film-forming polymer. Composition lubrifiante selon la revendication 12, dans laquelle le polymère filmogène est un polymère acrylique filmogène.The lubricant composition of claim 12, wherein the film-forming polymer is a film-forming acrylic polymer. Composition lubrifiante selon la revendication 1, contenant au moins un composant supplémentaire choisi dans le groupe formé par les catalyseurs de réaction de réticulation, les lubrifiants complémentaires, les agents d'évacuation de l'air, les agents anti-mousse, les épaississants, les charges, les stabilisants, les conservateurs et leurs combinaisons.Lubricant composition according to claim 1, containing at least one additional component chosen from the group formed by crosslinking reaction catalysts, complementary lubricants, air release agents, anti-foaming agents, thickeners, fillers, stabilizers, preservatives and combinations thereof. Composition selon la revendication 14, contenant un polymère filmogène.Composition according to Claim 14, containing a film-forming polymer.
EP94420194A 1993-07-23 1994-07-08 Siloxane lubricating composition without hydrogen emissions. Withdrawn EP0635559A3 (en)

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US5431832A (en) 1995-07-11
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KR950003428A (en) 1995-02-16
CN1099409A (en) 1995-03-01

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