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    Solvent-resistant greases for high speed bearings
    1.
    发明授权
    Solvent-resistant greases for high speed bearings 失效
    高速轴承用耐溶剂润滑脂

    公开(公告)号：US3377284A

    公开(公告)日：1968-04-09

    申请号：US46210165

    申请日：1965-06-07

    Applicant: DOW CORNING

    Inventor： SCHIEFER HARRY M ,  DELPHENICH JOHN S

    IPC: C07C273/18 ,  C07C275/28 ,  C10M169/02

    CPC classification number: C07C273/1827 ,  C10M169/02 ,  C10M2201/066 ,  C10M2215/08 ,  C10M2215/082 ,  C10M2215/102 ,  C10M2215/28 ,  C10M2219/06 ,  C10M2219/086 ,  C10M2219/087 ,  C10M2219/089 ,  C10M2229/051 ,  C10M2229/052 ,  C10N2220/02 ,  C10N2240/02 ,  C10N2250/10 ,  C10N2250/121 ,  C10N2270/00 ,  C07C275/28

    Abstract: A lubricant grease consists essentially of (a) from 60 to 90% (by wt.) of a liquid siloxane of the general formula where each R is a methyl, -CH2CH2.CbF2b+ 1, aryl, alkaryl or haloaryl radical, where the halogen is fluorine, bromine or chlorine, b has an integral value of 1 to 12, and n and a are numbers selected to yield a liquid having a viscosity at 25 DEG C. of 75 to 30,000 cs., the siloxane having at least a 30% (wt.) fluorine content, and (b) 10 to 40% of one or more compounds of the formula where R1 is a lower alkyl radical, x is 0 or 1, m is 0, 1 or 2, and Z is a monovalent nitrophenyl, a ,a ,a -trifluorotolyl, aryl, alkaryl, haloaryl or cycloalkyl radical containing at least 5 C atoms, and at least 1/8 of the Z radicals being nitrophenyl and/or a ,a ,a -trifluorotolyl radicals. Ingredient (b) is a reaction product of isocyanates with primary amines and may be formed in situ in siloxane (a). Conventional additives may also be present, e.g. pentachlorophenylmercapto acetic acid, MoS2, corrosion inhibitors and inorganic pigments. In a typical Example (1) ingredient (b) is formed in situ in the siloxane and in the presence of a solvent which is subsequently removed. The compositions are also useful as sealing compounds and rubber lubricants.ALSO:A lubricant grease consists essentially of (a) from 60 to 90% (by wt.) of a liquid siloxane of the formula where each R is a methyl, -CH2CH2.CbF2b + 1, aryl, alkaryl or haloaryl (the halogen being fluorine, chlorine or bromine) radical, b has a value of 1 to 12, and n and a are numbers selected to yield a liquid having a viscosity at 25 DEG C. of 75 to 30,000 cs., the siloxane having at least a 30% (by wt.) fluorine content, and (b) 10 to 40% of one or more compounds of the formula where R1 is a lower alkyl radical, x is 0 or 1, m is 0, 1 or 2, and Z is a monovalent nitrophenyl, a ,a ,a -trifluorotolyl, aryl, alkaryl or haloaryl radical or a cycloalkyl radical of at least 5 C atoms, and at least 1/8 of the Z radicals being nitrophenyl and/or a ,a ,a -trifluorotolyl radicals. Ingredient (b) is a reaction product of isocyanates with primary amines, and may be formed in situ in siloxane (a). Conventional additives may also be present, e.g. pentachlorophenylmercapto acetic acid, MoS2, corrosion inhibitors and inorganic pigments.ALSO:A compound of the formula wherein R1 is an alkyl radical of less than 7 C atoms, x is 0 or 1, m is 0, 1 or 2 and Z is a monovalent nitrophenyl, a ,a ,a -trifluorotolyl, aryl, alkaryl or haloaryl radical (the halogen being fluorine, chlorine or bromine) or a cycloalkyl radical containing at least 5 C atoms, and at least 1/8 of the Z radicals being nitrophenyl and/or a ,a ,a -trifluorotolyl radicals, is a reaction product of isocyanates with primary amines and can be made by either of the following reactions: Examples describe the above preparations in situ in an organopolysiloxane (see Division C3).

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