Colour temperature indicator for lubricating grease

C - Chemistry – Metallurgy – 10 – M

Patent

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Details

C10M 171/00 (2006.01) C10M 141/08 (2006.01) C10M 161/00 (2006.01) C10M 169/00 (2006.01)

Patent

CA 2070021

Lubricating compositions comprising a colour temperature indicator are disclosed. The compositions irreversibly change their colour when exposed to temperatures exceeding a predetermined limit temperature. The compositions comprise, as an essential component, from 0.2 to 4% by weight of metal dithiocarbamates or dialkyldithiocarbamates, preferably of antimony and/or lead in combination with a dye, preferably a blue dye, in an amount of from 50 to 2000 ppm. Other components, such as epoxy resins, may be also present, to increase and/or extend the range of temperatures in which the changes of colour are observed. The compositions are useful as indicators of overheating of lubricated elements under severe operating conditions.

Les compositions lubrifiantes comportant un indicateur de température de la couleur font l'objet de la présente divulgation. La couleur des compositions change de façon irréversible lorsqu'elles sont exposées à des températures supérieures à une limite de température préétablie. Les compositions comprennent, comme composant principal, de 0,2 à 4 % en poids de dithiocarbamates ou de dialkyldithiocarbamates d'un métal, de préférence l'antimoine et/ou le plomb, combinés à un colorant, de préférence un colorant bleu, dont la quantité varie de 50 à 2 000 ppm. D'autres composants, comme des résines époxy, peuvent également être présentes, afin d'augmenter et/ou d'étendre la plage de températures dans laquelle les changements de couleur sont observés. Les compositions servent d'indicateurs de surchauffe des éléments lubrifiés dans des conditions d'exploitation intenses.

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