A kind of motorcycle engine lubricating oil composition and preparation method thereof
A lubricating oil composition and engine technology, applied in the field of lubricating oil, can solve the problems of accelerating oxidation rate, shortening the service life of lubricating oil, etc., achieving excellent anti-wear performance and anti-oxidizing performance, and inhibiting the formation of high-temperature deposits.
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[0046] Among the present invention, the preparation method of the compound of structure shown in formula (I) preferably comprises:
[0047] (a) condensing 2,6-di-tert-butylphenol, formaldehyde and benzene to generate intermediate M shown in formula (II),
[0048]
[0049] (b) contacting the intermediate M obtained in step (a) with a bromination reagent to carry out a bromination reaction to generate a bromination product shown in formula (III),
[0050]
[0051] (c) make the brominated product that step (b) obtains contact with the compound shown in formula (IV) and carry out coupling reaction, generate the antioxidant shown in formula (I),
[0052]
[0053] In step (a) of the present invention, the conditions of the condensation reaction preferably include: under an inert atmosphere, in the first solvent, in the presence of the first catalyst, 2,6-di-tert-butylphenol, formaldehyde and benzene in- React at 20-0°C for 0.5-1.5h, then rise to 15-30°C, then heat to 70-80...
Embodiment
[0093] The following examples will further illustrate the present invention, but do not limit the present invention thereby.
[0094] In the following examples and comparative examples:
[0095] The physical and chemical analysis method of the product: the element content was determined by inductively coupled plasma ion emission spectrometry.
[0096] Structural characterization method: NMR method ( 1 H spectrum, 13 C carbon spectrum), high-resolution mass spectrometry.
preparation example
[0098] Fill a 500mL flask with an electromagnetic stirrer (stirring speed at 200rpm) with nitrogen protection, add 150mL of methanol and 0.01mol of acetic acid, fully cool in an ice-water bath, and then add 0.1mol of 2,6-di tert-butylphenol, 0.2 mol of formaldehyde and 0.3 mol of benzene. After reacting for 1 hour, remove the ice-water bath, heat up to 25°C, heat to 75°C and continue to reflux for 2 hours, then stop the reaction. Evaporate the solvent from the reacted system at 0.03MPa and 50°C, then add 250mL of ethyl acetate, and Transfer to a separatory funnel, wash with 100mL distilled water (twice) and 50mL saturated brine respectively, add 10g of anhydrous calcium chloride and dry at 25°C for 20min, and evaporate the filtered filtrate at 40°C and 0.03MPa solvent to obtain the intermediate product M1.
[0099] Fill a 500mL flask with an electromagnetic stirrer (stirring speed is 200rpm) with nitrogen protection, add 150mL of dry tetrahydrofuran, then dissolve the intermedi...
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