Acid-Neutral Phosphite Ratio for Wear Reduction
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Solution Overview
Problem
Existing anti-wear additive compositions fail to meet the new wear reduction specifications for automatic transmission fluids, such as DEXRON®-III, and may cause copper corrosion, which is not acceptable.
Innovation Solution
A synergistic combination of acid phosphite and neutral phosphite compounds in a specific weight ratio, typically between 1.0:10.7 to 2.0:1, is used in lubricating oils to reduce wear on metal surfaces while minimizing copper corrosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dialkyl phosphite is used as anti-wear additive, then wear reduction is achieved, but copper corrosion occurs
Solution Approach 1:
The patent combines acid phosphite and neutral phosphite compounds in a specific weight ratio (1:4 to 1:20) to create a synergistic anti-wear additive system. This combination achieves superior wear protection while eliminating copper corrosion, resolving the contradiction between wear reduction and copper corrosion prevention that plagues single-component additives like dialkyl phosphite.
Solution Approach 2:
The invention uses a composite additive system consisting of two distinct phosphite compounds with different chemical properties. The acid phosphite provides active wear protection while the neutral phosphite moderates corrosivity, creating a composite material that delivers both wear reduction and copper corrosion resistance simultaneously.
2Reliability
If GM reduced wear limit from 15 mg to 10 mg, then wear protection requirement is improved, but existing anti-wear additives fail to meet the new specification
Solution Approach 1:
The patent optimizes the weight ratio parameter of acid phosphite to neutral phosphite (specifically 1:4 to 1:20) to achieve the precise performance level required by the new GM specification. This parameter optimization enables the additive system to deliver wear protection exceeding the 10 mg limit requirement that existing single-component additives cannot achieve.
Solution Approach 2:
The invention uses a combination of additives where the neutral phosphite component acts as a modifier that enhances the overall performance beyond what either component could achieve alone. This partial action approach allows the system to exceed the stringent new wear specification requirements.
3Device complexity
If single-component anti-wear additives are used, then formulation simplicity is maintained, but performance consistency with new specifications cannot be achieved
Solution Approach 1:
The patent merges two phosphite compounds into a single additive package with a defined weight ratio range. This combination maintains relative formulation simplicity while achieving consistent performance that meets the new GM specifications, resolving the contradiction between simplicity and performance consistency.
Data Source
AI summary
An anti-wear additive composition comprising at least one acid phosphite compound and at least one neutral phosphite compound, wherein the ratio of the acid phosphite to the neutral phosphite is from about 1.0:10.7 to about 2.0:1.0, and lubricating oil compositions containing the same.