Method for sealing and assembling components of a drive train
A drive system and component technology, applied in the field of silicone elastomer sealing and assembly drive system components, can solve the problems of inability to obtain mechanical properties, expensive cross-linking agents, combined use, etc., and achieve excellent thermal stability, excellent hardness, The effect of good mechanical properties
Inactive Publication Date: 2013-08-07
BLUESTAR SILICONES FRANCE SAS
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Problems solved by technology
[0025] However, a problem associated with the use of organocatalysts with imine functionality as described in International Application WO 2004 / 020525 is that they must be used in the presence of specific crosslinkers, which are very reactive and expensive (silanes with 1-methylvinyloxy functional group), that is, traditional crosslinkers of simple structure such as alkyltrialkoxysilanes, which are very widely used in RTV-I or RTV-II formulations Alkyl silicates or polyalkylene silicates cannot be used in combination with them, unless the presence of very reactive crosslinkers such as silanes with 1-methylvinyloxy functionality is mandatory
This is because, without the presence of this very reactive silane, the crosslinking of the elastomer-forming composition is insufficient and good mechanical properties cannot be obtained
Therefore, when the 1,1,3,3-tetramethylguanidine (TMG) derivatives given in the preferred embodiments of this patent application are combined with traditional cross-linking agents such as poly When alkyl silicates are used together and in the absence of reactive silanes with methylvinyloxy functionality, the crosslinking of the system is insufficient and silicone elastomers cannot be obtained
Method used
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[0240] Catalyst (comparison) : PITA SM by Dupont: 80% (iPrO) 2 (EAA) 2 A mixture of Ti and 20% methyltrimethoxysilane (MTMS), where EAA = ethyl acetoacetate
[0241] I) Preparation of the catalyst according to the invention
[0242] (A-2): 1-butyl-2,3-dicyclohexyl-1,3-dimethylguanidine
[0243] To a solution of 19.12 g of N-methyl-N-cyclohexylamine (0.169 mol) in 160 ml of hexane was added dropwise 18.38 g of cyclohexyl isocyanate (0.147 mol), then the cloudy mixture was Heated at reflux for 2 hours, then dried and evaporated to give 35 g of crude N,N'-dicyclohexyl-N-methylurea. To a suspension of 17 g of this crude product (71.33 mmol) in 65 ml of dry toluene was added 12 g of POCl over 1 hour 3 (78 mmol), then after a few hours at 20°C, 15.5 g of N-butyl-N-methylamine (0.178 mmol) were added over 2 hours, then, after a further 2 hours at 20°C, 50 ml was added of water, then 49 g of a 35% sodium hydroxide solution were added under cooling, after which the biphasic ...
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Abstract
A method is described for sealing and assembling, pointing and / or coating a substrate by means of silicon elastomers prepared using silicon compositions that do not contain any metal catalyst such as, for example, tin, and cross-linking by polycondensation reactions in the presence of water (for example, ambient moisture).
Description
technical field [0001] The present invention relates to a method of sealing and assembling parts of a groupe moto-propulseur by means of a silicone elastomer prepared from a silicone composition free of catalysts of metals such as tin and which is obtained by Polycondensation reactions in the presence of water (eg, ambient moisture) effect crosslinking. The silicone elastomer prepared by the method of the present invention has: [0002] - a setting rate appropriate to the application requirements (at least 2mm of crosslinking within 24 hours), and [0003] - good mechanical strength properties such as breaking strength, modulus at 100% elongation and Shore hardness, and [0004] - good aging resistance in chemically aggressive fluids such as those used in drive trains, in this case engine oils, lubricants for gearboxes and shafts, oil / gasoline mixture, coolant, fuel or antifreeze. Background technique [0005] "Coolant" means any heat-carrying liquid used to remove heat...
Claims
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IPC IPC(8): C09J5/00C09J183/04F02F11/00C08L83/04C09D183/04F16J15/00
CPCC08G77/70C08G77/18C09D183/04C08K5/31C08G77/26C08G77/16C09J2483/00C08G77/08F02F11/00C09J5/00C08G77/14C08G77/80C08L83/04C08G77/28C09J183/04C08K5/3435C08G77/20
Inventor C·马利韦尔内T·爱尔兰
Owner BLUESTAR SILICONES FRANCE SAS