Preparation method of lubricating oil viscosity-temperature improver
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A technology of improver and lubricating oil, applied in the field of lubricating oil, can solve problems such as uncontrollable process, poor dispersion, unstable product quality, etc., achieve the effect of changing the viscosity-temperature characteristics, changing the viscosity-temperature performance, and preventing further growth
Inactive Publication Date: 2010-10-06
JINAN DEV ZONE XINGHUO SCI & TECH RES INST
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Problems solved by technology
If the dry dosage is increased and the temperature is increased, the process cannot be controlled, so the product quality is unstable and the dispersion in use is poor. This is a major disadvantage of the thermal oxidation preparation method
Method used
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Embodiment 1
[0013] at 90m 3 Add 18 tons of solvent hexane in the polymerization reaction vessel, add to 10 ℃, feed ethylene, propylene, styrene and hydrogen continuously in the reactor, the molar ratio of hydrogen, ethylene, propylene, styrene is 0.1:0.45:1 : 0.8, stirred and reacted for 1 hour, added 1.8kg main catalyst benzoyl peroxide and 3.6kg cocatalyst triethylaluminum, stopped stirring after the end of the reaction, added methanol to terminate, washed with NaOH alkali solution, and vacuum dried to obtain product ethylene Propylene styrene copolymer.
Embodiment 2
[0015] at 90m 3 Add 20 tons of solvent hexane in the polymerization reaction vessel, add to 20 ℃, feed ethylene, propylene, styrene and hydrogen continuously in the reactor, the molar ratio of hydrogen, ethylene, propylene, styrene is 0.3:0.5:1 : 1, stirred and reacted for 2 hours, added 20kg main catalyst benzoyl peroxide and 80kg cocatalyst triethylaluminum, stopped stirring after the end of the reaction, added methyl alcohol to terminate, washed with NaOH alkali solution, and vacuum-dried to obtain product ethylene propylene benzene Ethylene copolymer.
Embodiment 3
[0017] at 90m 3 Add 25 tons of solvent hexane in the polymerization reaction container, be heated to 30 ℃, feed ethylene, propylene, styrene and hydrogen continuously in the reactor, the mol ratio of hydrogen, ethylene, propylene, styrene is 0.2: 1: 1:0.8, stirred for 2.5 hours, added 125kg of main catalyst benzoyl peroxide and 875kg of cocatalyst triethylaluminum, stopped stirring after the reaction, added methanol to terminate, washed with NaOH alkali solution, and vacuum dried to obtain the product ethylene Propylene styrene copolymer.
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Abstract
The invention relates to a preparation method of a lubricating oil viscosity-temperature improver, belonging to the lubricating oil field. The preparation method of the invention comprises the following steps: adding a solvent, i.e. hexane to a polymerization vessel at the temperature of 10-50 DEG C; continuously introducing ethylene, propylene, styrene and hydrogen to the vessel at a mol ratio of 0.1-0.3:0.45-1:1:0.8-1; stirring to react for 1-3h, and then adding a main catalyst, i.e. benzoyl peroxide and an assistant catalyst, i.e. aluminum triethyl, wherein the addition amount of the main catalyst is 0.01-1wt% of that of the solvent, and the addition amount of the assistant catalyst is 2-10 times that of the main catalyst; after reaction is completed, stopping stirring, and then adding methanol to terminate; and finally washing with alkali solution, and then drying in vacuum to obtain the product, i.e. a copolymer of ethylene, propylene and styrene. The preparation method can change the overall indicators of lubricating oil such as viscosity-temperature property, thickening capability, low-temperature performance, dispersibility and the like, thus the lubricating oil is obviously superior to the current similar products.
Description
technical field [0001] The invention belongs to the field of lubricating oil, in particular to a preparation method of a lubricating oil viscosity-temperature improver. Background technique [0002] Viscosity temperature improver is one of the indispensable additives of multi-grade engine oil, and its proportion is second only to detergent and dispersant. Statistics in the United States show that the amount of viscosity index improver is increasing at a rate of 12% per year. The essence of the viscosity-temperature improver is to improve the viscosity-temperature performance of the oil, so that the oil has a higher viscosity index, so as to ensure that the engine can start smoothly at low temperature, and the oil has sufficient viscosity at high temperature to ensure good lubrication . At the same time, it is required that the viscosity-temperature improver does not have obvious harmful effects on the oxidation stability and detergency of the oil, and the multi-grade engine...
Claims
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