Rhodorsil Oils 47 Technical information - Silitech

1 Rhodorsil oils 47 Technical information 2cIntroduction - NomenclaturecApplications of Rhodorsil oils 47cChemical Structure of Rhodorsil oils 47cGeneral properties of Rhodorsil oils 47cCharacteristics of Rhodorsil oils 47cPhysical properties of Rhodorsil oils 47vVolatiles contentvHeat stabilityvFlammabilityvLow temperature behaviorvViscosity RheologyvCompressibilityvSpecific gravityvRefractive indexvSurface tensionvSpecific heatvThermal conductivityvVolume expansionvSound transmissionvLight transmissionvRadiation withstandvVapor pressurecDielectric propertiescChemical properties Effects on materialsContents345781020223 The Rhodorsil oils 47nomenclatures are constituted:Introduction47the number 47 References of Bluestar Siliconespolydimethylsiloxane oilsthe letter Vto indicate viscositya numberindicating the viscosity level in mm2/s at 25 CRhodorsil oils 47are polydimethylsiloxane oils and are a major category of silicones sold by Bluestar are constituted of linear molecular chains of varying lengths whosegroups comprise alternating silicon and oxygen atoms (the Si-O-Si siloxanebond).

2 The silicon atoms are saturated by methyl groups the carbon chains of organic substances generally have lowresistance to external influences, the stability of the Si-O bonds is basicallycomparable to that of inert mineral :- Oil 47 V 100 is an oil with a viscosity of 100 mm2 Oil 47 V 1,000,000 is an oil of viscosity1,000,000 mm2/sThe Rhodorsil oils 47range covers aviscosity range of 1 to1,000,000 mm2 for silicone elastomers (sealants, RTV, etc.)cFoam control agentscAdditives for Styrene-Butadiene foamscRelease and demolding agents cLubricantscTextiles softeners cSewing thread lubricant cEmulsions for off-set printingcComponents for household products andpolishes for wood, leather, metals, floors, carscUsage in cosmetics, shampoos, creamscLubrication of medical equipmentcMedical uses, excipient, active ingredientcTr eatment and water repellency of fillerscDielectric fluidscHydraulic, damping and gearbox fluidscHeating fluids (up to temperatures of around 200 C)cCooling fluidsApplications ofRhodorsil oils 47 There are many different applications of these information , we can mention a few of them such as.

3 5 They have the following general formulaThe viscosity of these oils increases with theirpolymerization degree, which corresponds tovalue of the n index as shown in graph N 1(viscosity of Rhodorsil oils 47according todegree of polymerization). Rhodorsil oils 47are still liquid at ambianttemperatures for a value of the n index ofaround 2,000. For greater values these oilsgradually tend to of these oils are mixtures of polysiloxanechains that are quite regularly distributed aroundthe average molecular mass. For example,graph N 2 shows a distribution of molecularmasses in a Rhodorsil Oil 47of viscosity 10 mm2/s, obtained by gel average molecular mass increases as a function of the degree of polycondensation n , therefore is a function of their viscosity as shown in table N 1 (molecular mass ofRhodorsil oils 47as a function of viscosity).

4 Chemical structure ofRhodorsil oils 4747 V47 V47 V47 V47 V47 V47 V47 V47 V47 V47 V51020501003005001 00012 50060 000100 0009001 5002 8007 00010 00018 00028 00038 000aboutaboutaboutto 1 100to 1 800to 3 200to 8 000to 12 000to 20 000to 30 000to 40 00080 000125 000145 000 OilsMolecular mass ( )CH3 Si O Si O Si CH3CH3CH3CH3CH3CH3CH3nTable 1 Molecular mass ofRhodorsil oils 476 Graph 1 Viscosity of polydimethylsiloxane oils as a function of degree of polymerization n Comment: the straight part of the graphcorresponds to the BARRY relation for molecular masses > 2500:log ncSt= 1,00 + 0,0123 M0,5100 00010 0001 00010010101622 000 5 000 10 00050 000100 0005102030409 5001 230390 Distribution of molecular massesAverage molecular massIn weight Mp 1560 g/molIn number Mn 1210 g/molPolydispersion indexMp/Mn = 1, : Mn : Average mass by numberWhere ni and ci respectively represent the number and concentration by weight of each molecule of mass MiMp.

5 Average mass by weightMn = = (niMi) (ni) (ci) ciMi()Polydispersion indexThe ratio Mp/Mn is equal to 1 for strictlymonodisperse polymersMp = = (niMi2) (niMi) (ciMi) (ci)The sum is carried out from i = 1(monomer) to i = , i representing the degree of polymerization (number of groups)* Exclusion Diffusion ChromatographViscosity at 25 C (mm2/s)Molecular mass (calculated)Molecular massGraph 2 Molecular mass by EDC* of a polydimethylsiloxane oil of viscosity 10 mm2/s7 The polysiloxane chains very flexible due to the wide range in value of possible angles in the Si-O-Sigroup; this flexibility allows lateral groups to occupy the space in an exceptional number of addition, the rotary freedom of the methyl group around the Si-C bond is maintained even atextremely low temperatures.

6 The macromolecular chains will be arranged in loosely configured spiralswith a high amount of internal free space leading to low intermolecular forces and very low interactionbetween properties ofRhodorsil oils 47cThis macromolecular chain structure givesRhodorsil oils 47a very specific set ofcharacteristics and features:vlow pour point (around -50 C),vvery low glass transition temperature (around -125 C),vlow viscous pouring activation energy,vlow viscosity (compared to carbon-chainorganic products of the same length),vlow variation in viscosity as a function of temperature,vlow surface tension,vhigh compressibility,vexcellent intensive and prolonged shearstrength,vlow and high temperature resistance,vresistance to oxidation and hydrolysis,vlack of ageing by atmospheric agents(oxygen-ozone-water-light-UV),vche mically inert (no risk of corrosion),vvery limited combustibility,vnon miscibility with many organic properties open up a very widerange of applications.

7 Vdemolding or release agents,vhydraulic, heat transfer and dielectric fluids,vlubricants,vfoam control agents,vactive components in maintenance productformulations,vactive components in cosmetic,pharmaceutical or food preparations (food contact). :in cosmetic, pharmaceuticals and foodcontact applications, Rhodorsil oils 47of controlled are sold under the names of MirasilDM, Silbione DM GMP and Silbione oils are discribed in separate table on page 9 gives the characteristics of Rhodorsil oils 47. The values given are averagevalues and not specifications. At the start of the table is oil 41 V can be assimilated tohexamethyldisiloxane a Rhodorsil oils 47with the index n equal to 0. The formula is as follows:Characteristics ofRhodorsil oils 47(CH3)3 Si O Si (CH3)3CH3CH3CH3CH3 Viscosity at 25 C (mm2/s)41 V V 347 V 547 V 2047 V 5047 V 10047 V 35047 V 50047 V 1000 OilsSpecific gra vity at 25 CFlashpoint at C(closed cup)Freezing point at CRefractive index at 25 CSurface tension (mN/m)Vapor pressure at 200 C (Pascal)Expansion coefficient between25 C and 100 C (cm3/cm3.)

8 C)Specific heat (Joules/g, C)Thermal conductivity (Watt/m. C)Viscosity/temperaturecoefficientDielec tric strength (kV/mm)Dielectric constant at 25 Cbetween and 100 kHzLoss angle at 25 C0,5 kHz100 kHzVolume resistivity at 25 C (ohm/cm)0,6535205010035050010000,7600,89 00,9100,9500,9590,9650,9700,9700,970- 475120240280> 300> 300> 300> 300- 67- 80- 65- 60- 55- 55- 50- 50- 501,3751,3951,3971,4001,4021,4031,4031,4 031,40315,918,919,720,620,720,921,121,12 1,11,331,331,331,331,331,331, , , , , , , , , ,91,631,461,461,461,461,460,100,110,120, 140,160,160,160,160,160,310,550,590,590, 600,620,620,621414141415161616162,182,50 2,592,682,802,802,802,802, V 5000toV 6000005000 to6000000,973> 300- 451,40421,11,339, ,500,160,62182, :vOil 604 V 50is a version of 47 V 50oil,manufactured specially for dielectric viscosity/temperature coefficient isobtained by the following formula:1 viscosity at 100 Cviscosity at 40 CvThe percentage of silicon in Rhodorsil oils 47of viscosity greater than or equal to 1,000 mm2/s is basically equal to (NA:not available)91 0009008007006005004003002001009080706050 4030201 0009008007006005004003002001009080706050 4030200102030405060708090100 Percentage of fluid with the higher viscositycObtaining a Rhodorsil Oil 47with a viscosity between two is possible to prepare products of intermediaryviscosities by mixing two Rhodorsil oils 47(these oils are miscible with one another in allproportions).

9 Use graph 3 on page 10 accordingto the following the viscosity grades to be mixed: to obtain an oil of intermediary viscosity it is best to mix two oils with close the lower viscosity at the left axis ofthe the upper viscosity on the right of the two points with a straight the intersection of this straight line withthe horizontal line corresponding to the plotting a vertical line passing through this point the bottom of the graph gives thepercentage by weight of fluid with the highestviscosity. It must be completed with a lowviscosity fluid up to 100%.In the example given on graph N 3, mixing 70%of oil 47 V 1000with 30% of oil 47 V 100gives a fluid of viscosity 500 mm2 graph covers fluids with viscosities ofbetween 20 and 1,000 mm2 you want to use it for Rhodorsil oils 47with higher viscosities you must multiply thegiven viscosity values by 3 Graph to estimate the viscosity of Rhodorsil oils 47mixturesViscosity (mm2/s)10 Physical properties ofRhodorsil oils 471.

10 Volatile contentThe vapor pressure, and consequently thevolatility, is very low for Rhodorsil oils 47witha viscosity of over 50 mm2/s. Calculating ofvolatile matter is carried out under well definedconditions: apparatus, time, temperature,sample weight, etc. For information purposes please find thefollowing values of volatile content measuredaccording to standard ASTM D method: 10g oil 24 hours 150 C air circulation: 2 oils 47of average viscosity (V50 to 1,000): % volatile content < oils 47of high viscosity (> V1000): % volatile < volatile content of Rhodorsil oils 47isexpressed as a percentage of weight : at this temperature we only measure thevolatile matter existing in the oil, there is nonegenerated by thermal breakdown of themolecule. The values given are Heat stability Due to the large amount of energy in the Si-Obond and the configuration of the siloxanechain, Rhodorsil oils 47have outstandingstability to oxidation and heat the presence of air,oxidation phenomenawith Rhodorsil oils 47start at around 200 are seen in terms of the break down ofsilicon-carbon bonds with cross linking of thechains, and an increase in viscosity until a gel is formed.