Preparation method of ethylene propylene copolymer used for modifying lubricating oil

A technology of ethylene propylene and copolymers, applied in the field of preparation of additive compositions, can solve problems such as undisclosed preparation methods of ethylene propylene copolymers, and achieve the effects of short preparation process time, excellent low-temperature performance, and changing viscosity-temperature performance

Inactive Publication Date: 2003-07-02
PETROCHINA CO LTD
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  • Abstract
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Problems solved by technology

But none of these patent documents discloses the preparation method of the ethylene propylene copolymer used for lubricating oil modification

Method used

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Examples

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Embodiment 1

[0015] at 90m 3 Add 18 tons of hexane solvent in the polymerization reactor, heat up to 30 DEG C, feed ethylene, propylene, hydrogen gas mixture continuously in the reactor, the ratio (mol ratio) of three kinds of gases is hydrogen: ethylene: propylene = 0.2: 1: 3.5, the air intake rate of the control mixed gas is 1200L / h to keep the pressure in the reactor at 0.5MPa, stir and react for 2.5 hours, add the cocatalyst alkylaluminum halide 9.6Kg while feeding the mixed gas, and Add 0.2Kg of vanadium acetylacetonate as the main catalyst dropwise, stop stirring after the reaction is over, add methanol to terminate, wash with NaOH solution twice after termination, static layer, let go of the lower aqueous solution, and vacuum dry the upper layer of glue at 50°C for 45 hours , to obtain the product ethylene propylene copolymer 1000Kg. The obtained ethylene-propylene copolymer had a molecular weight of 1.45 dl / g, a molecular weight of 98,000, a molecular weight distribution of 2.3, a...

Embodiment 2

[0017] at 90m 3 Add 25 tons of hexane solvent in the polymerization reactor, heat up to 12 DEG C, feed ethylene, propylene, hydrogen gas mixture continuously in the reactor, the ratio (mol ratio) of three kinds of gases is hydrogen: ethylene: propylene = 0.45: 1: 2.5, control the intake rate of the mixed gas to be 1500L / h to keep the pressure in the reactor at 0.45MPa, stir and react for 1.5 hours, add 25Kg of the cocatalyst alkylaluminum halide while feeding the mixed gas, and drop Add 1.25Kg of vanadium acetylacetonate as the main catalyst, stop stirring after the reaction is completed, add methanol to terminate, wash 3 times with NaOH solution after termination, static layer, let go of the lower aqueous solution, and vacuum dry the upper layer of glue at 35°C for 58 hours. The obtained product ethylene propylene copolymer 1200Kg. The obtained ethylene-propylene copolymer had an intrinsic viscosity of 1.4 dl / g, a molecular weight of 80,000, a molecular weight distribution o...

Embodiment 3

[0019] at 90m 3 Add 18 tons of hexane solvent in the polymerization reactor, heat up to 48 DEG C, feed ethylene, propylene, hydrogen gas mixture continuously in the reactor, the ratio (mol ratio) of three kinds of gases is hydrogen: ethylene: propylene = 0.1: 1: 2.2, control the gas inlet rate of the mixed gas to be 1800L / h to keep the pressure in the reactor at 0.6MPa, stir and react for 1 hour, add the cocatalyst alkylaluminum halide 6.6Kg while feeding the mixed gas, and Add 1.65Kg of vanadium acetylacetonate as the main catalyst dropwise, stop stirring after the reaction is over, add methanol to terminate, wash with NaOH solution twice after termination, static layer, let go of the lower aqueous solution, and vacuum dry the upper layer of glue at 65°C for 35 hours , to obtain 1500Kg of the product ethylene propylene copolymer. The obtained ethylene-propylene copolymer had an intrinsic viscosity of 1.23 dl / g, a molecular weight of 88,000, a molecular weight distribution of...

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Abstract

A process for preparing the ethylene-propylene copolymer used to modify lubricating oil includes such steps as heating hexane to 10-50 deg.C, introducing the gas mixture of ethylene, propylene and hydrogen gas in a polyreactor while adding acetylacetone vanadium as catalyst and halogenated alkylaluminium as cocatalyst, stirring while reaction for 1-3 hr until reaction finished, adding methanol for termination, washing with alkali solution, and vacuum drying.

Description

Technical field: [0001] The invention relates to a preparation method of an additive composition for improving the viscosity index of lubricating oil, in particular to a preparation method of an ethylene-propylene copolymer for lubricating oil modification. Background technique: [0002] In the prior art, some patent documents have disclosed that ethylene propylene copolymer is used as a viscosity index improver of lubricating oil to change the viscosity-temperature performance of lubricating oil. For example, U.S. Patent No. 3,598,738 discloses "Oil containing ethylene copolymer as viscosity index improver", which believes that the best ethylene-propylene copolymer composition is about 60 mol% (Wt% ethylene) ), the comonomer content is about 40 mol% (50Wt%), and only the copolymer with such a composition can be used as a lubricating oil additive to change the viscosity-temperature performance of the lubricating oil, and has excellent performance. Guan Guo Patent US 5,068,0...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F210/06C10M107/06
Inventor 蔡小平邹向阳廖风英
Owner PETROCHINA CO LTD
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