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Ethylene-propylene copolymer viscosity index improver and preparation and application thereof

A technology of ethylene-propylene copolymer and viscosity index, used in the preparation of lubricating oil viscosity index improver, ethylene-propylene copolymer viscosity index improver and its preparation, application of ethylene-propylene copolymer viscosity index improver in modulation of internal combustion engine oil It can solve the problems affecting the low temperature performance and service life of internal combustion engine oil, high shear stability index, low thickening ability, etc., and achieve low shear stability index, good low temperature pumpability and shear resistance performance, and outstanding low temperature performance. Effect

Active Publication Date: 2007-12-05
SINOPEC LANZHOU GASOLINEEUM CHEM IND CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, viscosity index improvers (such as the viscosity index improvers RHY-613 and RHY-614 produced by PetroChina Lanzhou Petroleum Company) have some shortcomings when preparing internal combustion engine oils, such as: large dosage (13-16%), thickening Low capacity (0.42~0.50mm 2 / s), high shear stability index (26-35%), these characteristics will directly affect the low-temperature performance and service life of internal combustion engine oil

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1, the preparation of viscosity index improver

[0019] Take mineral base oil A (the properties of base oil A are shown in Table 1) 800 ± 50g as base oil, join in the normal pressure small sol degradation kettle, add domestic binary ethylene propylene rubber (number average molecular weight is 5-100,000) 100 ±50g, 100±50g of imported binary ethylene propylene rubber (number average molecular weight: 50,000-150,000), start stirring, raise the temperature to 95-140°C and stir for 6±2 hours to obtain the viscosity index improver VM8520 product. After determination, the thickening ability of the obtained viscosity index improver is 0.94mm 2 / s, the shear stability index is 18.40%. The specific measurement data are shown in Table 2.

Embodiment 2

[0020] Embodiment 2, the preparation of viscosity index improver

[0021] This embodiment is an enlarged test of embodiment 1 on the production device, the ratio of the viscosity index improver composition formula is the same as that of example 1, and the reaction is carried out in an atmospheric pressure sol degradation kettle. Take 2500±300kg of base oil A as the base oil, add it to the colloidal sol kettle at normal pressure, add 250±50kg of domestic binary ethylene propylene rubber (number average molecular weight is 50,000-100,000), imported binary ethylene propylene rubber (number average molecular weight 50,000-150,000) 250±50kg, start stirring, raise the temperature to 95-140°C, and stir at constant temperature for 6±2 hours to obtain the viscosity index improver VM8520 product. The thickening ability of the obtained viscosity index improver is 0.92mm 2 / s, the shear stability index is 17.28%. The specific measurement data are shown in Table 2.

Embodiment 3

[0022] Embodiment 3, the preparation of viscosity index improver

[0023] Take 800±50g of base oil B (the properties of base oil B are shown in Table 1) as the base oil, add it to the normal pressure small sol degradation kettle, add domestic binary ethylene propylene rubber (the number average molecular weight is 5-100,000) 100±50g 50g, imported binary ethylene propylene rubber (number average molecular weight: 50,000-150,000), start stirring at 100±50kg, heat up to 95-140°C, and stir at constant temperature for 6±2 hours to obtain the viscosity index improver product. After determination, the thickening ability of the obtained viscosity index improver is 0.91mm 2 / s, the shear stability index is 18.60%. The specific measurement data are shown in Table 2.

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Abstract

The present invention provides one kind of viscosity index improver of ethylene-propylene copolymer. The viscosity index improver is prepared with base oil in 75-88 wt% and ethylene-propylene rubber in 12-25 wt%, and through mixing in a normal pressure sol degrading kettle, heating to 95-140 deg.c slowly, and stirring at constant temperature for 3-10 hr. The viscosity index improver for modulating high grade internal combustion engine oil has high thickening capacity of 0.85-0.96 sq mm / s, low shear stability index below 20 %, outstanding low temperature performance, and small added amount of 6.5-8 %.

Description

technical field [0001] The invention belongs to the field of petrochemical industry, and relates to a preparation method of a lubricating oil viscosity index improver, in particular to an ethylene-propylene copolymer viscosity index improver and a preparation method thereof, and at the same time, the invention also relates to an ethylene-propylene copolymer viscosity index improver Application in modulation of internal combustion engine oil. Background technique [0002] Viscosity index improvers, also known as viscosifiers, are mainly used in internal combustion engine oils, hydraulic oils, automatic transmission fluids and gear oils. In the scope of lubricating oil additives, their usage is second only to detergents and dispersants. Viscosity index improvers are oil-soluble chain polymer compounds that are soluble in hydrocarbon base oils used in lubricants. At low temperature, the polymer coil of the viscosity index improver shrinks, which has little effect on the intern...

Claims

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Application Information

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IPC IPC(8): C10M143/04C10N20/02C10N30/02
Inventor 冯乐刚盖琴元龚晓晖彭树忠
Owner SINOPEC LANZHOU GASOLINEEUM CHEM IND CORP
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