Synergistic dispersants

A technology of dispersants and additives, applied in the directions of additives, lubricating compositions, petroleum industry, etc., can solve problems such as harmful seals and increased corrosion

Active Publication Date: 2017-11-28
AFTON CHEMICAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, high dispersant treat rates can increase corrosion and be detrimental to seals

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0166] The following examples are illustrative, but not limiting, of the methods and compositions of the present application. Other appropriate modifications and adaptations of the various conditions and parameters commonly encountered in the art and apparent to those skilled in the art are within the spirit and scope of the application. All patents and publications cited in this application are hereby incorporated by reference in their entirety.

[0167] Tests to evaluate the measured effective concentration

[0168] In order to evaluate lubricant formulations according to the present application, various dispersant combinations were tested for their ability to disperse soot. A sooting oil with 4.3 wt% soot was produced from a diesel fired engine using fluid without dispersant. The oil is then tested by shear rate sweeps in a cone and plate rheometer to determine Newtonian / non-Newtonian behavior.

[0169] The results for untreated soot-adhering oil are shown in figure 1 m...

Embodiment 1

[0193] Lubricant compositions were prepared using samples of the above-described sooting oil and an additive composition containing the two dispersants and the additional additives listed above. The first dispersant was PIBSA comprising a mixture of MW 1300 HR PIB and MW 2300MW PIB.

[0194] The second dispersant in the combination is the post-treatment reaction product of PIBSA (containing highly reactive PIB in a molar ratio of SA:PIB of 1.75:1) with tetraethylenepentamine in a molar ratio of PIBSA:amine of 4: 3 to 2:1. The reaction product is then worked up with naphthalic anhydride. The weight percent of the first dispersant in the lubricant composition was kept constant at 29.5 wt% to provide the lubricant composition with 2.25 wt% polymer, based on the total weight of the lubricant composition. The weight percent of the second dispersant was varied to provide different amounts of the polymer of the second dispersant to the lubricant composition, based on the total weig...

Embodiment 2

[0197] Lubricant compositions were prepared using samples of the above-described sooting oil and an additive composition containing the two dispersants and the additional additives listed above. The first dispersant in the combination is the reaction product of highly reactive PIB and succinic anhydride SA (SA:PIB molar ratio 1.15:1) with a mixture of triethylenetetramine and E-100 (bottom product), where The molar ratio of PIBSA:amine is from 4:3 to 2:1.

[0198] The second dispersant in the combination is a work-up reaction product of a mixture of highly reactive PIB and succinic anhydride (SA:PIB molar ratio 1.75:1) with triethylenetetramine and E-100 (bottom product), Wherein the molar ratio of PIBSA:amine is 4:3 to 2:1. The product is then worked up with a mixture of naphthalic anhydride and maleic anhydride. The weight percent of the first dispersant in the lubricant composition was kept constant at 50% by weight to provide the lubricant composition with 1.65% by weigh...

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Abstract

The invention relates to lubricant compositions including an additive composition and methods for its use in engines that produce soot. The lubricant composition contains a base oil and an additive composition having (a) at least 0.05 percent by weight of a first dispersant that is a reaction product of A) a hydrocarbyl-dicarboxylic acid or anhydride, and B) at least one polyamine; and (b) at least 0.05 percent by weight, both based on a total weight of the lubricant composition, of a second dispersant that is a reaction product of A') a hydrocarbyl-dicarboxylic acid or anhydride, and B') at least one polyamine, wherein the reaction product is post-treated with C) an aromatic carboxylic acid, an aromatic polycarboxylic acid, or an aromatic anhydride wherein all carboxylic acid or anhydride groups are attached directly to an aromatic ring, and / or D) a non-aromatic dicarboxylic acid or anhydride having a number average molecular weight of less than about 500.

Description

technical field [0001] The present application relates to lubricant compositions, and in particular to methods for improving or maintaining the soot or sludge handling characteristics of engine lubricant compositions while enabling the treat rate of dispersants in the lubricant compositions Minimized additive composition. Background technique [0002] Engine lubricant compositions can be selected to provide enhanced engine protection, as well as improve fuel economy, and reduce emissions. However, to achieve the benefits of improved fuel economy and reduced emissions, lubricant compositions are required that balance engine protection and lubricating performance. For example, increasing the amount of friction modifier may be beneficial for fuel economy purposes, but may result in a reduced ability of the lubricant composition to handle water. Similarly, increasing the amount of antiwear agents in a lubricant may provide improved engine protection against wear, but may be de...

Claims

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Application Information

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IPC IPC(8): C10M133/56C10M141/06C10N30/04C10N40/25
CPCC10M133/16C10M133/56C10M141/06C10M2207/129C10M2215/24C10N2030/041C10N2030/04C10N2030/74C10N2040/25C10M2207/123C10M2207/142C10M2207/16C10M2215/04C10M2215/28C10M2223/045C10M133/52C10M161/00C10M133/00C10N2020/04C10N2020/083C10N2030/50C10N2030/54C10N2040/253C10N2040/251C10N2040/252C10N2040/255C10N2060/00C10M169/04C10N2030/06C10N2030/10C10N2030/12C10N2030/02C10N2030/24C10M159/12
Inventor D·坎贝尔J·拉格纳
Owner AFTON CHEMICAL
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