High Molecular Weight Phosphite Esters for Lubricant Applications
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Solution Overview
Problem
Low molecular weight phosphites used in driveline lubricants can absorb into elastomeric seals, causing degradation, and interact with sulfur-containing materials to produce objectionable odors, while also posing toxicity and corrosion issues.
Innovation Solution
A lubricant composition comprising a phosphite ester reaction product of monomeric phosphorous acid with specific alkylene diols, including an alkyl-substituted 1,3-propylene diol, along with borated dispersants, calcium-containing detergents, and additional phosphorus-containing compounds, to achieve higher molecular weight phosphites that reduce seal degradation, odor, toxicity, and corrosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If low molecular weight phosphites are used in driveline lubricants, then lubrication performance is improved, but seal degradation occurs due to absorption into elastomeric seals
Solution Approach 1:
The patent changes the molecular weight parameter of the phosphite additive from low to high molecular weight. This parameter change resolves the contradiction by maintaining lubrication performance while eliminating seal degradation, as the higher molecular weight phosphites do not absorb into elastomeric seals like their low molecular weight counterparts do.
Solution Approach 2:
The patent employs a composite approach by combining multiple phosphite esters with different molecular weights and structures (including polymeric phosphite esters with specific diol components) to create a synergistic additive package that provides effective lubrication without the harmful seal absorption effects of low molecular weight phosphites.
2Reliability
If low molecular weight phosphites are used in driveline lubricants, then antiwear performance is improved, but objectionable odors are produced through interaction with sulfur-containing materials
Solution Approach 1:
The patent changes the molecular weight parameter of the phosphite additive, which simultaneously affects both antiwear performance and odor generation. The higher molecular weight phosphites maintain adequate antiwear protection while significantly reducing the formation of objectionable odors through interactions with sulfur-containing materials in the lubricant.
Solution Approach 2:
The patent converts the potential harmful interaction between phosphites and sulfur-containing materials (which produces odors) into a beneficial outcome by using higher molecular weight phosphites that interact differently with sulfur, reducing odor formation while maintaining the desired antiwear performance through controlled chemical interactions.
3Reliability
If low molecular weight phosphites are used in driveline lubricants, then lubrication effectiveness is improved, but toxicity and corrosion issues arise
Solution Approach 1:
The patent changes the molecular weight parameter of the phosphite additive from low to high molecular weight, which resolves the contradiction by maintaining lubrication effectiveness while reducing toxicity and corrosion. The higher molecular weight phosphites exhibit lower volatility and reduced reactivity with metal surfaces, thereby minimizing toxic emissions and corrosion problems.
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 solution provides improved antiwear performance, reduced seal degradation, minimized odor, lower toxicity, and reduced corrosion, while maintaining effective lubrication properties for automatic and continuously variable transmissions.
Implementation Method 1
Phosphorus esters of various types are well known for their use as lubricant additives
Implementation Method 2
A lubricant composition comprising an oil of lubricating viscosity and a phosphite ester composition
Data Source
AI summary
A lubricant composition of an oil of lubricating viscosity and a phosphite ester reaction product of a monomeric phosphorous acid or an ester thereof with a first alkylene diol having two hydroxy groups in a 1,4 or 1,5 or 1,6 relationship and a second, alkyl-substituted, diol being a substituted 1,3-propylene diol, exhibits good wear and frictional performance.