Lubricating oil viscosity index improver and preparation thereof
A viscosity index improvement and viscosity index technology, which is applied in the field of lubricating oil viscosity index improvers and their preparation, can solve the problems of reduced shear stability and achieve good thickening ability, good compatibility, and excellent shear stability sexual effect
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Embodiment 1
[0042] Example 1: 3500 milliliters of pure cyclohexane, 5.5 milliliters of tetrahydrofuran, and 6.4 mmol of n-butyllithium were added to a 10-liter polymerization kettle replaced with pure nitrogen, and the temperature was raised to 60 ° C under stirring, and then 56 g of styrene and 224g of butadiene monomer mixture is continuously added to the polymerization tank, the feeding time is controlled to be 45-75 minutes, the polymerization temperature is 60-85°C, and the monomer is added and then reacted for 0-15 minutes, and then 13.4mmol of diethylene is added Coupling reaction with benzene, the temperature of the coupling reaction is controlled at 60-85°C, and the coupling reaction time is 30-60 minutes. After the coupling reaction is completed, the glue is introduced into the hydrogenation tank, and dimethyl phthalate is used as a cocatalyst. Dicyclopentadiene titanium dichloride is the main catalyst, and the hydrogenation reaction is carried out under the conditions of control...
Embodiment 2
[0053] Embodiment 2: The preparation process is the same as in Example 1, changing the addition amount of initiator n-butyllithium to synthesize polymers with different single-arm molecular weights, and keeping the molar ratio of n-butyllithium and divinylbenzene in the coupling reaction as 2.2. The experimental results are shown in Table 1.
[0054] Table 1 Results of polymer modified lubricating oils with different single-arm molecular weights
[0055]
Embodiment 3
[0056] Embodiment 3: The preparation process is the same as in Example 1, changing the ratio of styrene and butadiene to synthesize different benzene
[0057] The polymers with ethylene content, the experimental results are shown in Table 2.
[0058] Table 2 Results of polymer modified lubricating oils with different styrene contents
[0059]
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