Poly(Meth)Acrylate Viscosity Index Improver for Wide-Temperature Lubrication
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Solution Overview
Problem
Existing viscosity index improver compositions do not provide a sufficient viscosity index improving effect in lubricating oils, leading to issues such as increased wear and seizure due to viscosity changes over a wide temperature range.
Innovation Solution
A viscosity index improver composition comprising specific poly(meth)acrylates (A) and (B) with defined constituent units, including diol functional groups and boronic acid esters, blended to maintain low viscosity at low temperatures and high viscosity at high temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the viscosity of the lubricating oil composition is reduced to improve fuel efficiency, then fuel efficiency is improved, but the oil film becomes thin under high temperature conditions causing increased wear and seizure
Solution Approach 1:
The patent applies parameter changes by carefully controlling the molecular weight distribution, polydispersity index, and compositional ratios of poly(meth)acrylate components to achieve a viscosity index of 150 or higher. This allows the oil to maintain low viscosity at operating temperatures for fuel efficiency while ensuring sufficient viscosity at high temperatures to prevent wear and seizure through adequate oil film formation.
2Stability of the object's composition
If a viscosity index improver is added to improve temperature dependence of viscosity, then viscosity stability over temperature range is improved, but the composition complexity increases
Solution Approach 1:
The patent employs composite materials by formulating a viscosity index improver composition consisting of multiple poly(meth)acrylate components with different molecular characteristics. Specifically, it combines poly(meth)acrylate with number-average molecular weight of 10,000-50,000 and polydispersity index of 1.05-1.30 with poly(meth)acrylate having weight-average molecular weight of 100,000-500,000. This composite approach achieves superior viscosity stability (viscosity index ≥150) across wide temperature ranges while managing composition complexity through controlled blending ratios.
3Stability of the object's composition
If existing viscosity index improver compositions are used, then some viscosity improvement is achieved, but the viscosity index improving effect is insufficient
Solution Approach 1:
The patent achieves enhanced viscosity index improving effect (viscosity index of 150 or higher) by precisely controlling critical parameters including the number-average molecular weight (10,000-50,000), polydispersity index (1.05-1.30), and the ratio between different poly(meth)acrylate components. These parameter optimizations result in significantly improved viscosity stability compared to conventional viscosity index improvers, directly enhancing productivity in terms of viscosity control effectiveness.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The composition effectively stabilizes viscosity across a wide temperature range, enhancing fuel efficiency and reducing wear by maintaining optimal viscosity levels.
Implementation Method 1
Poly(meth)acrylate (A): containing a constituent unit (Y) derived from a monomer (y) having a diol functional group, Poly(meth)acrylate (B): containing a constituent unit (Z) derived from a monomer (z) having a boronic acid ester
Data Source
AI summary
A viscosity index improver composition which has an excellent viscosity index improving effect. A viscosity index improver composition which includes a poly(meth)acrylate (A) including a constituent unit (Y) derived from a monomer (y) having a diol functional group, and a poly(meth)acrylate (B) including a constituent unit (Z) derived from a monomer (z) having a boronic acid ester.