Lubricating oil viscosity index improver

A viscosity index improvement, viscosity index technology, applied in the field of lubricating oil, can solve the problems of high glass transition temperature, low temperature performance to be further improved, limited application scope of branched polyethylene, etc., to achieve stable chemical properties and excellent shear resistance. The effect of cutting ability

Inactive Publication Date: 2015-11-04
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the glass transition temperature of branched polyethylene prepared with the existing (α-diimine) nickel catalyst is higher than -53°C (Macromolecules, 2009, 42:7789),

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0020] Example 1

[0021] The degree of branching is 84 branches / 1000 carbons (the content of methyl branches in the branch is 53.7 mol%, the content of ethyl branches is 4.8 mol%, the content of propyl branches is 5.3 mol%, and the content of butyl branches is 5.3 mol%. The chain content is 3.6mol%, the amyl branch content is 17.5mol%, the carbon number ≥ 6 branch chain content is 15.1mol%), the glass transition temperature is -59 ℃, the weight average molecular weight is 374,000, and the molecular weight distribution index is The highly branched polyethylene of 1.8 was added to the lubricating oil base oil PAO6, the addition amount of the highly branched polyethylene was 1% (mass ratio) of the PAO6, and the highly branched polyethylene was dissolved by stirring. After testing, the dynamic viscosity of the lubricating oil solution at the test temperature of 100°C is 15.42 mPa·S, which is 10.65 mPa·S higher than that of the lubricating base oil PAO6.

Example Embodiment

[0022] Example 2

[0023] The degree of branching is 99 branches / 1000 carbons (the content of methyl branches in the branch is 49.3 mol%, the content of ethyl branches is 5.6 mol%, the content of propyl branches is 5.1 mol%, and the content of butyl branches is 5.1 mol%. The chain content is 3.9mol%, the amyl branch content is 18.9mol%, the carbon number ≥ 6 branch chain content is 17.1mol%), the glass transition temperature is -63 °C, the weight average molecular weight is 262,000, and the molecular weight distribution index is The highly branched polyethylene of 1.8 was added to the lubricating oil base oil PAO6, the addition amount of the highly branched polyethylene was 1% (mass ratio) of the PAO6, and the highly branched polyethylene was dissolved by stirring. After testing, the dynamic viscosity of the lubricating oil solution at a test temperature of 100 °C is 10.02 mPa·S, which is 5.25 mPa·S higher than that of the lubricating base oil PAO6.

Example Embodiment

[0024] Example 3

[0025] The degree of branching is 111 branches / 1000 carbons (the content of methyl branches in the branch is 47.6 mol%, the content of ethyl branches is 8.6 mol%, the content of propyl branches is 5.2 mol%, and the content of butyl branches is 5.2 mol%. The chain content is 4.2mol%, the amyl branch chain content is 18.1mol%, the carbon number ≥ 6 branch chain content is 16.3mol%), the glass transition temperature is -66°C, the weight average molecular weight is 201,000, and the molecular weight distribution index is The hyperbranched polyethylene of 1.9 was added to the lubricating oil base oil PAO6, the addition amount of the hyperbranched polyethylene was 1% (mass ratio) of the PAO6, and the hyperbranched polyethylene was dissolved by stirring. After testing, the dynamic viscosity of the lubricating oil solution at a test temperature of 100 °C is 9.15 mPa·S, which is 4.38 mPa·S higher than that of the lubricating base oil PAO6.

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Abstract

The invention relates to the technology of lubricating oil, and aims at providing a lubricating oil viscosity index improver. The lubricating oil viscosity index improver is highly branched polyethylene with a branching degree of 84-124 branched-chains/1000 carbons, a glass transition temperature of -59 DEG C to -67 DEG C, a weight average molecular weight of 64,000-374,000, and a molecular weight distribution index of 1.7-1.9. According to the invention, the highly branched polyethylene molecular structure does not contain unsaturated double bond, and has stable chemical property, oxidation resistance and excellent shearing resistance due to a unique topological structure. The branched polyethylene is adopted as the lubricating oil viscosity index improver. When the lubricating oil viscosity index improver is added into lubricating oil base oil, the highly branched polyethylene has high solubility in the lubricating oil base oil, such that in a preparation process, long-time heating is not required, and the preparation process of lubricating oil is simplified; the lubricating oil viscosity index improver has good thickening performance; the raw material cost is lower than that of existing viscosity index improver; the glass transition temperature of the lubricating oil viscosity index improver is low, such that cold resistance is good.

Description

technical field [0001] The invention belongs to the technical field of lubricating oil, in particular to a viscosity index improver for lubricating oil. Background technique [0002] The lubricating oil used in actual production is based on base oil and blended with various additives. In order to make the lubricating oil not drop too much in the high temperature environment and still maintain the lubricating performance, the viscosity in the low temperature environment will not be too high, and the engine is still easy to start, it is necessary to add a viscosity index improver to adjust the viscosity temperature performance of the lubricating oil. Viscosity index improvers are a type of additives that account for a relatively large proportion in lubricating oils. They are generally oil-soluble chain polymer compounds that are rubbery solid substances at room temperature, with molecular weights ranging from tens of thousands to hundreds of thousands. It dissolves in lubrica...

Claims

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Application Information

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IPC IPC(8): C10M143/02C10N30/02
Inventor 傅智盛臧丹丹范志强
Owner ZHEJIANG UNIV
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