BE691186A - - Google Patents

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Publication number
BE691186A
BE691186A BE691186DA BE691186A BE 691186 A BE691186 A BE 691186A BE 691186D A BE691186D A BE 691186DA BE 691186 A BE691186 A BE 691186A
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BE
Belgium
Prior art keywords
sep
siloxane
weight
group
oxyalkylene
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English (en)
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Publication date
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Publication of BE691186A publication Critical patent/BE691186A/fr

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02K—JET-PROPULSION PLANTS
    • F02K1/00—Plants characterised by the form or arrangement of the jet pipe or nozzle; Jet pipes or nozzles peculiar thereto
    • F02K1/78—Other construction of jet pipes
    • F02K1/82—Jet pipe walls, e.g. liners
    • F02K1/822—Heat insulating structures or liners, cooling arrangements, e.g. post combustion liners; Infrared radiation suppressors
    • 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
    • C—CHEMISTRY; METALLURGY
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    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
    • C10M2201/02—Water
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    • C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
    • C10M2201/04—Elements
    • C10M2201/041—Carbon; Graphite; Carbon black
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    • C10M2201/04—Elements
    • C10M2201/041—Carbon; Graphite; Carbon black
    • C10M2201/042—Carbon; Graphite; Carbon black halogenated, i.e. graphite fluoride
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    • C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
    • C10M2201/06—Metal compounds
    • C10M2201/063—Peroxides
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    • C10M2201/065—Sulfides; Selenides; Tellurides
    • C10M2201/066—Molybdenum sulfide
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    • C10M2229/051—Siloxanes with specific structure containing atoms other than silicon, hydrogen, oxygen or carbon containing halogen
    • 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
    • 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
    • C10M2229/052—Siloxanes with specific structure containing atoms other than silicon, hydrogen, oxygen or carbon containing nitrogen
    • 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
    • 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
    • C10M2229/053—Siloxanes with specific structure containing atoms other than silicon, hydrogen, oxygen or carbon containing sulfur
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
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    • C10N2010/00—Metal present as such or in compounds
    • C10N2010/02—Groups 1 or 11
    • C—CHEMISTRY; METALLURGY
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    • C10N2010/00—Metal present as such or in compounds
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    • C—CHEMISTRY; METALLURGY
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    • 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
    • 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
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    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/06—Instruments or other precision apparatus, e.g. damping fluids
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
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    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/08—Hydraulic fluids, e.g. brake-fluids
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    • C—CHEMISTRY; METALLURGY
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Description


   <Desc/Clms Page number 1> 
 



    "Lubrifiants   aqueux   oontenant   des copolymères de siloxanes et de polyoxyalkylènes" 
La présenta invention est basée sur la découverte que les copolymères composes d'un fragment de   ailoxane   lié , à un fragment de plyoxyalkylène par une liaison silicium- carbone peuvent être utilisés comme additifs dans   de'3   com- positions lubrifiantes aqueuses comme il est décrit dane le brevet principal. 



   On a maintenant trouvé que l'on peut   onoore     amé-   liorer le comportement des compositions lubrifiantes   aqueu-   ses en incorporant dans ces compositions une polyoléfine à   J'état   émulsionné. 



   Les compositions lubrifiantes selon la présente 

 <Desc/Clms Page number 2> 

 invention comprennent un fluide aqueux de base et un copo-   lymère   de siloxane et   d'oxyalkylène   présent en une quantité comprise entre environ 0,0005 et 0,1 partie en poids, par rapport à une partie en poids du fluide de base. Les com- positions contiennent également, sous une forme émulsionnée, une polyoléfine dont le poids moléculaire est compris entre environ 1500 et 25000 et qui est incorporée à raison   d'en-   viron 0,001 à 0,1 partie en poids par partie en poids du fluide de base. On préfère que la polyoléfine soit présente dans la composition dans un rapport pondéral du copolymère de siloxane et   d'oxyalkylène   à la polyoléfine d'environ 1:1. 



   Le fluide de base pour les compositions lubrifian- tes selon l'invention peut être de l'eau ou un mélange d'eau et de lubrifiant fluide organique. Le lubrifiant fluide organique peut être (1) un composé de polyoxyalkylène exempt de silicium, (2) un ester   dialkylique   d'un acide dicarboxylique aliphatique, (3) une huile lubrifiante   hydro-   carbonée, (4) un ester d'un polyalcool avec un acide gras, ou (5) un mélange de deux ou plusieurs des ingrédients pré- cités.

   Si le fluide de base est un   mélange   d'eau et d'un lubrifiant fluide organique, le rapport pondéral de l'eau à ce lubrifiant fluide est compris de préférence entre en- . viron 10:1 et   1:2.     Lo   rapport pondéral de l'eau au   lubri-   fiant fluide organique dans le mélange ne doit pas être inférieur à environ 1 :2, c'est-à-dire que le fluide de base peut contenir de l'eau jusqu'à environ 2 parties en poids du lubrifiant fluide par partie en poids d'eau. 



   Lorsque la polyoléfine est présente sous une forme émulsionnée, elle améliore encore plus les propriétés des compositions lubrifiantes selon   l'invention.   Une polyoléfine 

 <Desc/Clms Page number 3> 

 convenable présente un poids moléculaire compris entre environ 1500 et 25.000 et un point de fusion qui ne dépasse pas avantageusement   200 0..Parmi   les polyoléfines de ce genre, on citera typiquement les   homopolymères   et les   co-   polymères d'une alpha-oléfine contenant environ 2 à   12   ato- mes de carbone. En raison de leur aptitude à   l'émulsionne-   ment, on'préfère les polyoléfines contenant en moyenne au moins un groupe polaire pour quatre molécules de polyolé- fine. 



   On peut obtenir des polyoléfines dans la gamme pré- citée des poids moléculaires par polymérisation directe, polymérisation en émulsion ou par pyrolyse d'une   polyolé-   fine d'un poids moléculaire plus élevé. 



   La technique mentionnée en   dernier   lieu sera pré- férée, car la pyrolyse d'un polymère d'un poids moléculaire relativement plus élevé crée une   insaturation   vinylique terminale qui est facilement disponible pour réagir avec un monomère polaire à insaturation éthylénique comme l'an- hydride maléique ou l'acide   thioglycolique,   comme il est décrit dans les brevets des Etats-Unis   d'Amérique   N  2 766 214 et 3 144   348, à   la suite de quoi la poly- oléfine résultante devient facile à émulsionner. 



     '   Une autre technique utile pour préparer les poly- mères émulsionnables contenant des groupes polaires en un nombre suffisant consiste en une   oxydatioii,   en présence ou en l'absence d'un catalyseur, de manière   à   créer des   grou-   pes carboxyliques latéraux sur la chatne du polymère con- jointement avec des groupes   oétone,   aldéhyde et hydroxyle. 



  Parmi lea autres polyoléfines émulsionnables on citera les copolymères séquences que   l'on   obtient par réaction de 

 <Desc/Clms Page number 4> 

 l'oxyde d'éthylène avec du polyéthylène de manière à obte- nir des polymères à terminaison hydroxyle, selon les   en-   seignements du brevet des Etats-Unis   d'Amérique N    2 921 920. 



  Parmi les autres polyoléfines appropriées, on signalera les télomères d'éthylène et d'alcool que l'on fait réagir aveo de l'aoide maléique selon les enseignements du brevet des Etats-Unis d'Amérique N  2 766 214. 



   On peut également introduire la proportion néces-   saire   de groupes polaires dans les homopolymères et   copo-     lymères   précités des alpha-oléfines par la copolymérisation des polyoléfines ainsi   obtenues   avec des monomères insaturés contenant une liaison   éthylénique;   comme par exemple   l'acry-        late d'éthylène, le styrène, le   bicycloheptène,   l'acétate de vinyle, l'acide acrylique, etc. 



    @   
En outre, la polymérisation directe et/ou l'hy-   drolyse   des polymères oléfiniques précitées peuvent intro- duire le degré nécessaire de polarité dans la chaîne du polymère afin de rendre les polymères émulsionnables et rendre stable l'émulsion résultante.      



   La polymérisation en émulsion se fait en général par   l'émulsionnement   de l'oléfine de départ dans l'eau à l'aide d'un agent d'émulsionnement convenable, que l'on      fait suivre d'une polymérisation de l'oléfine sous une pression et à une température élevées en pxésence d'un catalyseur de polymérisation. Parmi les procédés de poly- mérisation en émulsion, on citera notamment ceux qui font l'objet des brevets des Etats-Unis d'Amérique N S 2 342 400, 2 542 783, 2 592 526 et 2 703 794. 



   L'estimation des compositions lubrifiantes ci- après a été établie en utilisant un appareil d'essai "Falex   @   

 <Desc/Clms Page number 5> 

 
Tester,,et l'appareillage d'essai comprend dans ce cas un arbre amovible d'un diamètre de 6,35   mm   (broche d'acier 
N  8) que l'on fait tourner à 290 tours/minute entre deux blocs d'acier en V. On peut usiner l'arbre dans de l'acier   $AU     3135   ayant une dureté   Rockwell     B   de   87   et un finissage d'une valeur moyenne quadratique (vmq) de 8 à 10, et on peut usiner les deux blocs en V en acier   AISI   x C 1137 ayant une dureté   Rockwell   C de 20 et une vmq de 6 à 8 (Méthode I). 



  En variante, on peut usiner l'arbre en un acier à outils   M-2   ayant une dureté   Rockwell   C de 60 et une vmq de 12 à   14,   et on peut usiner les deux blocs en V en   aoier   inoxydable   440 CI   ayant une dureté Rockwell C de 60 et une vmq de 12 à 14 (Méthode   II).   



   On place les deux blocs en V de façon à pouvoir les forcer contre l'arbre à l'aide d'une roua chargeuse   à   crans. Le réglage nécessaire de la roue chargeuse pendant   l'essai   pour maintenir une charge prédéterminée   fournit   une indication da l'usure de l'arbre d'essai, Le réglage   de. chaque   cran ou dent sur la roue chargeuse correspond à une usure de l'arbre de   1,448   micron. 



     .Au   cours de l'essai aussi bien l'arbre que les blocs en V sont immergés dans le lubrifiant dont on désire déterminer les qualités. 



   Les stades au cours de l'essai sont les suivants : (1) .on commence l'essai en faisant tourner l'arbre en- tre les blocs en V pendant 3 minutes sous une charge de 45,3   kg ;   (2) on augmente la charge à raison de 45,3 kg à la minute jusqu'à un total de 453 kg ; (3) une fois la charge de 453 kg atteinte, on procède 

 <Desc/Clms Page number 6> 

 
 EMI6.1 
 aim aU;'!1"!EHltatio!la 8accasiVE:e ài .x.:. oharA'- ;J-2>,.' 1? ..la i13,25 .K; r'3, la minute, g ,',Df;:t i.:.i, rj,c  ! 3:'sj,i :1.< ,l::;:1;'.:;aution d '''J1lc: charge max.ma.,lo de 2041 1 k, ;

   (4) on enregistre chaque minute le   couple   et la temp- rature et (5) au cours de chaque intervalle d'une minute, on   en-'   registre l'usure de l'arbre d'essai sous   forme   du nombre de   crans   de la roue chargeuse   que-l'on   a été obligé de régler pour maintenir la charge désirée, 
Après l'essai, on mesure la largeur moyenne de l'empreinte sur les blocs en V en utilisant un   microscope   et on   calcule     ensuite * la   pression de   contact   en kg/cm2 à partir des équations suivantes: 
 EMI6.2 
 .c}:1.ara).e, de.

   Ji!,'riP'!>, ;:; charge supportée, ka S1,harp:e.,.J?.Q..:r...t1.8e 1 kg 1 .¯..0 ,.... - ;:; kg/om2 longueur de l'empreinte x largeur. dé l'empreinte (cm) 
 EMI6.3 
 lompxeur ria l'empreinte = 1,27 oro. Les Dxcmpios suivants servent à. illustrer l'inven-! tion sans aucunement en limiter la portée. 



   Exemple 1 
On estime dans l'essai   "Falex"   par la "Méthode I" le comportement d'émulsions aqueuses contenant environ 0,2 % en poids de solides d'émulsion et environ 0,2 % en poids du copolymère XVIII du brevet principale Les résultats sont indiqués dans le tableau'! ci-après:

   

 <Desc/Clms Page number 7> 

 .'   TABLEAU  ITAB 
 EMI7.1 
 
<tb> Identification <SEP> Charge <SEP> de <SEP> Type <SEP> de
<tb> 
 
 EMI7.2 
 , de '1 J énÍulsion ..Type d'émulsion. grippage l'agont ¯¯± ¯¯¯ ¯ ' , ¯ . ,,kg,", d'émulsionnement 
 EMI7.3 
 
<tb> P <SEP> Caoutchouc <SEP> SBR <SEP> carboxylé <SEP> 1361
<tb> 
<tb> 
<tb> A <SEP> Polyéthylène <SEP> >2041 <SEP> non <SEP> ionique
<tb> 
<tb> 
<tb> Néant <SEP> 0,2 <SEP> % <SEP> pds <SEP> du <SEP> copolymère <SEP> 567
<tb> 
<tb> 
<tb> XVIII <SEP> (témoin)
<tb> 
 
Les données ci-dessus montrent que la combinaison d'une émulsion de polyoléfine aqueuse avec un copolymère de siloxane et d'oxyalkylène donne une composition lubri- fiante possédant de très bonnes propriétés de support de charge'et d'anti-soudage,

   
Exemple 2 
On détermine la répercussion sur les pressions de contact de l'addition d'un copolymère de siloxane et   d'oxy-     alkylène   à une émulsion de polyoléfine aqueuse, par le pro- cédé "Falex" "Méthode II". Les résultats sont indiqués au tableau II   ci-aprés   

 <Desc/Clms Page number 8> 

 TABLEAUII 
Largeur 
 EMI8.1 
 
<tb> ,Lubrifiant <SEP> essayé <SEP> dans <SEP> l'eau <SEP> Charge <SEP> moyenne <SEP> de <SEP> Pression
<tb> 
<tb> contenant <SEP> 0,1 <SEP> % <SEP> en <SEP> poids <SEP> du <SEP> nominale <SEP> au <SEP> l'empreinte <SEP> de <SEP> contact <SEP> 
<tb> 
 
 EMI8.2 
 -. COT.)9lypèr XVHI .- - eri .p!tB,E1.J- , , (am) '; krd.c.n..2...;.. 
 EMI8.3 
 
<tb> 0,1%pds <SEP> de <SEP> copolymère <SEP> XVIII
<tb> 
 
 EMI8.4 
 d'addition 567 0t924   2812. 
 EMI8.5 
 
<tb> 



  0,1 <SEP> % <SEP> pds <SEP> de <SEP> solides <SEP> dans
<tb> 
<tb> 
<tb> 
<tb> l'émulsion <SEP> F <SEP> 1474 <SEP> 0,041 <SEP> 20.389
<tb> 
<tb> 
<tb> 
<tb> 
<tb> 
<tb> 
<tb> 
<tb> 0,1 <SEP> % <SEP> pds <SEP> de <SEP> solides <SEP> dans
<tb> 
<tb> 
<tb> 
<tb> 
<tb> l'émulsion <SEP> A <SEP> 2041 <SEP> 0,041 <SEP> 28.120
<tb> 
<tb> 
<tb> 
<tb> 
<tb> 
<tb> 
<tb> 
<tb> 0,1 <SEP> % <SEP> pds <SEP> de <SEP> solides <SEP> dans
<tb> 
<tb> 
<tb> 
<tb> 
<tb> l'émulsion <SEP> A <SEP> 1814 <SEP> 0,036 <SEP> - <SEP> 28,120
<tb> 
<tb> 
<tb> 
<tb> 
<tb> 
<tb> 
<tb> 
<tb> 
<tb> 0,1 <SEP> % <SEP> pds <SEP> de <SEP> solides <SEP> dans
<tb> 
<tb> 
<tb> 
<tb> l'émulsion <SEP> 1 <SEP> 1247 <SEP> 0,053 <SEP> 13.358
<tb> 
<tb> 
<tb> 
<tb> 
<tb> 
<tb> 
<tb> 
<tb> 
<tb> 0,1 <SEP> % <SEP> pds <SEP> de <SEP> laurate <SEP> de <SEP> tri-
<tb> 
<tb> 
<tb> 
<tb> 
<tb> 
<tb> éthanolamine <SEP> (savon)

   <SEP> 1134 <SEP> 0,030 <SEP> 21.092
<tb> 
 
 EMI8.6 
 Contrôle du s.YJlerg,i.sme :- J'o,m,Rarer fl.v.résultats", ci-d!3J313jl 
 EMI8.7 
 
<tb> 0,2 <SEP> % <SEP> pds <SEP> de <SEP> solides <SEP> dans
<tb> 
<tb> l'émulsion <SEP> F <SEP> 1134 <SEP> 0,038 <SEP> 16.874
<tb> 
<tb> 
<tb> 0,2 <SEP> % <SEP> pds <SEP> de <SEP> solides <SEP> dans
<tb> 
<tb> 
<tb> l'émulsion <SEP> A <SEP> 1361 <SEP> ' <SEP> 0,041 <SEP> ' <SEP> 18.280
<tb> 
<tb> 
<tb> 
<tb> 0,2 <SEP> % <SEP> pds <SEP> de <SEP> copolymère <SEP> XVIII <SEP> 567 <SEP> 0,124 <SEP> 2.812
<tb> 
<tb> 
<tb> 
<tb> 
 
 EMI8.8 
 Détermination des éE1J:b!.1Li..911$3 précttée.s. 



  Emulsion A - Emulsion aqueuse non ioniquede polyéthylène   ohi   miquement inerte de faible poids moléculaire, 
 EMI8.9 
 émulsionné par un dérivé polyoxyéthylénique d'un composé aliphatique. 



  Emulsion F - Emulsion aqueuse non ionique do polyéthylène craqué de forte densité (poids moléculaire : environ   20QO)   modifié avec   environ 5 %   en poids d'anhydride maléique et émulsionné avec un mélange d'éthers 

 <Desc/Clms Page number 9> 

 
 EMI9.1 
 nany.phnyl;Lques de 1:X>J.v6thyène glyool contenant environ 4 et environ 7 moles d'oxyda   d'éthylène   et avec de la morpholine. 



  Emulsion I - Emulsion aqueuse non ionique de polyéthylène de faible densité (poids moléculaire environ   24.000)   préparé par polymérisation en émulsion. 



    Emulsion 2 -   Latex aqueux de styrène et da butadiène.

Claims (1)

  1. Les données ci-dessus démontrent que l'on peut obtenir une augmentation synergique des pressions de contact en combinant un copolymère de siloxane et d'oxylalkylène avec une polyoléfine en émulsion aqueuse, - RESUME - Composition lubrifiante, caractérisée par les points suivants séparément ou en combinaisons : 1) Elle comprend (A) un fluide de base aqueux qui est l'eau ou un mélange d'eau avec un maximum d'environ 2 parties par partie en poids.d'eau d'un lubrifiant fluide organique qui est un composé polyoxyalkylénique exempt de silioium, un ester dialkylique d'un acide diearboxylique aliphatique, une huile lubrifiante hydrocarbonée ou un ester d'un polyalcool avec un acide gras ;
    (B) environ 0,0005 à 0,1 partie en poids par partie en poids du fluide de base d'un copolymère de siloxane et d'oxyalkylène contenant : (a) au moins une séquence de siloxane contenant au moins deux groupes de siloxane de la formule : RbSiO4-b dans laquelle R représente un groupe hydrocarbure monovalent, un groupe hydrocarbure monovalent substitué par un halogène., un groupe oyano, un groupe amino, un groupe amido, un groupe <Desc/Clms Page number 10> EMI10.1 "', :")'3.:U,H'X:l an groupe éi"..t.1'?i, m) '::?>r}ùVrJ ?î.-.3;".7',;#3a : a "}:ë ; Ï.,uya, riiro, ou un croups ?yc3:T ;43raax^e o..,',:'ln.. .Jt .P.
    J:.'\:;frésE:nt( un nombr0 comrië entre 1 et 3 1.1;+11;1, et la séqu.>no: de Hiloxane contient au moins 'un groupe d'hydro- carbure bivalent représenté par R, st (b) au moins une EMI10.2 séquence de po.yoxyaJkylne contenant au moins deux groupes oxyalkylène représentés par la formule : -R, O- dans laquelle R' représente un groupe alkylène, chaque séquence de siloxane étant liée à chaque séquence de poly- oxyalkylène par le groupe hydrocarbure divalent représenté par R ;
    et(C) une polyoléfine sous une forme émulsionnée ayant un poids moléculaire moyen compris entre environ 1500 et 25.000 et étant présente à raison d'environ 0,001 à 0,1 partie en poids par une partie en poids du fluide de base, 2) Le fluide de base est un mélange aqueux d'eau et d'un composé de polyoxyalkylène exempt de silicium, dans un rapport pondéral d'onviron 10 :1 à environ 1:2. EMI10.3
    3) Le copolymère dv siloxane et d 1 oxyalkylène est représenté par la formule : EMI10.4 dans laquelle G''' représente un atomè d'hydrogène ou un groupe d'hydrocarbure monovalent, G" représente un radical alkylène contenant au moins deux atomes de carbone ; G' représente un radical hydrocarbure divalent ; G repré- sente un radical d'hydrocarbure monovalent ; n a une valeur. d'au moins 2 ; et c a une valeur comprise entre 0 et 2 inclus. <Desc/Clms Page number 11> EMI11.1 4) Le popolymëre de f3iloxano et d'oxyalkylène est roprésenté par la formule : EMI11.2 EMI11.3 dans laquelle.G" représente un radical alkylëno contenant ,au moins 2 atomes do o w3laana ; G' re-prcsentu un radical hydrocarbure divalent 1;
    G reprisante un radical hydrocar" bure monovalent n a une 'valeur d'au moins 2 ; et o a une valeur do 0 à 2 inclus. EMI11.4
    5) Le copolynëre dé siloxane et d'oxyalkyibne est représente par la formule : EMI11.5 dans laquelle G''' représente un atome d'hydrogène ou un groupe hydrocarbure monovalent; g" représente un radical EMI11.6 a7.kyJ.ènc contenant au moins deux atO!!\èf3 de carbone ; Go représente un radical hydrocarbure divalent ; G représente un radical hydrocarbure monovalent ; est égal au moins à' et 2 a une valeur comprise entre 0 et 1 inclus. EMI11.7
    6) Le copolymère do siloxane ot d'oxyalkylcne ost représenté par la formule moyenne : <Desc/Clms Page number 12> EMI12.1 dans laquelle Me représente un groupe méthyle.
    7) La composition contient en outre de l'éthylène- glycol à rniaon d'environ 0,01 à 2 parties en poids par partie en poids de l'eau présente.
    8) Le rapport pondéral du copolymère de siloxane et d'oxyalkylène à ln polyoléfine est d'environ 111.
BE691186D 1965-12-15 1966-12-14 BE691186A (fr)

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