Viscosity Index Improver Composition for Lubricant Antifoaming
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Solution Overview
Problem
Lubricants with lower viscosity, aimed at improving fuel economy, suffer from issues like foaming, poor lubrication, mechanical loss, and increased noise, leading to environmental concerns, and existing viscosity index improvers and antifoaming agents have insufficient antifoaming properties and low shear stability.
Innovation Solution
A viscosity index improver composition containing a (co)polymer with a specific monomer, a C18-C40 chain aliphatic alcohol, and a base oil, which provides excellent viscosity index improvement, antifoaming properties, and long-term antifoaming persistence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a lubricant with lower viscosity is used to improve fuel economy, then fuel economy is improved, but foaming increases and lubrication performance deteriorates
Solution Approach 1:
The patent uses a composite viscosity index improver system combining a polyalphaolefin backbone with grafted fatty acid esters and carboxylic acid components. This composite structure provides both the low-temperature flow properties needed for fuel economy and the film-forming capabilities required for reliable lubrication, resolving the contradiction between reduced viscosity and maintained lubrication performance.
Solution Approach 2:
The patent modifies the viscosity index improver molecular structure by controlling the degree of grafting (0.1-10 mmol/g) and molecular weight distribution to achieve optimal balance between low-temperature fluidity and high-temperature film strength, allowing the lubricant to maintain adequate viscosity for lubrication while enabling lower base oil viscosity for fuel economy.
2Object-generated harmful factors
If polysiloxane antifoaming agents are used to reduce foaming, then foaming is reduced, but shear stability decreases and antifoaming performance is lost over time
Solution Approach 1:
The patent introduces a specific polyalphaolefin-based viscosity index improver as an intermediary substance that inherently provides antifoaming properties through its molecular structure. This intermediary component reduces foaming without the shear instability problems of polysiloxane antifoamers, as it is structurally integrated into the base lubricant system rather than being a separate additive package.
Solution Approach 2:
The patent replaces expensive, shear-unstable polysiloxane antifoamers with a cost-effective polyalphaolefin-based viscosity index improver that provides sustained antifoaming performance. The VI improver's stable molecular structure ensures long-term antifoaming persistence without the rapid degradation characteristic of conventional antifoaming agents.
3Use of energy by moving object
If known viscosity index improvers are used to improve fuel economy, then viscosity index is improved, but antifoaming properties are insufficient
Solution Approach 1:
The patent designs a polyalphaolefin-based viscosity index improver that simultaneously performs multiple functions: improving viscosity index for fuel economy and providing inherent antifoaming properties. This multi-functional additive eliminates the need for separate antifoaming agents and resolves the contradiction between viscosity improvement and foaming control.
Solution Approach 2:
The patent creates a composite molecular structure within the viscosity index improver by grafting fatty acid esters and carboxylic acid components onto the polyalphaolefin backbone. This composite structure provides both viscosity modification capabilities and surface-active properties for foam suppression, allowing a single additive to address both fuel economy and foaming issues.
Data Source
AI summary
The present invention aims to provide a viscosity index improver composition capable of providing a lubricant composition that has an excellent viscosity index improving effect, excellent antifoaming properties, and excellent persistence of the antifoaming properties. The present invention relates to a viscosity index improver composition, containing: a (co)polymer (A) containing a monomer (a) represented by the following formula (1) as an essential monomer; a C18-C40 chain aliphatic alcohol (B); and a base oil,[Chem. 1]wherein R1 is a hydrogen atom or a methyl group; —X1— is a group represented by —O— or —NH—; R2 is a C2-C4 alkylene group; R3 and R4 are each independently a C8-C24 linear or branched alkyl group; and p is an integer of 0 to 20, with each R2 being optionally the same as or different from each other when p is 2 or greater.