Acid-Free Polyisobutene Corrosion Inhibitors for Fuel Systems
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Solution Overview
Problem
Corrosion inhibitors in fuels and lubricants tend to precipitate in the presence of calcium ions, reducing their effectiveness and causing deposits that impair engine and fuel system components, particularly in the injection system.
Innovation Solution
The use of reaction products of polyisobutene, essentially free of acid groups, derived from reacting polyisobutene with maleic acid derivatives such as monoalkyl esters, dialkyl esters, or anhydrides, which retain more than 90% of their ester or anhydride groups, providing compatibility with calcium ions and maintaining corrosion-inhibiting effects in fuels with alkali, alkaline earth metals, and zinc.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional corrosion inhibitors based on structures containing acid groups (e.g., dimer fatty acids) are used, then corrosion-inhibiting effect is achieved, but they precipitate in the presence of calcium ions, reducing effectiveness and causing deposits
Solution Approach 1:
The invention changes the chemical parameters of the corrosion inhibitor by removing acid groups through reaction with maleic acid derivatives. This transforms the molecular structure from acid-containing to acid-free, fundamentally altering how the compound interacts with calcium ions and other metals, thereby preventing precipitation while maintaining corrosion protection
Solution Approach 2:
The invention creates a composite chemical structure by reacting polyisobutene with maleic acid derivatives to form a new compound class. This composite material combines the beneficial properties of polyisobutene (solubility, stability) with functional groups from maleic acid derivatives, achieving both corrosion inhibition and calcium compatibility
2Reliability
If corrosion inhibitors are used in fuels containing alkali and alkaline earth metals (e.g., calcium, zinc), then corrosion protection is provided, but the inhibitors precipitate and form deposits that impair engine and fuel system components
Solution Approach 1:
The invention converts the harmful interaction between acid-group-containing inhibitors and metal ions (which causes precipitation) into a beneficial acid-free structure. By removing the problematic acid groups, the compound can now coexist with metals like calcium and zinc without forming harmful deposits, while still providing corrosion protection
Solution Approach 2:
The chemical composition parameter is fundamentally changed by eliminating acid groups through reaction with maleic acid derivatives. This parameter change prevents the formation of insoluble metal salts and deposits in the fuel system, solving the harmful effect while preserving the protective function
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
These acid group-free polyisobutene reaction products effectively inhibit corrosion in the presence of calcium and other metals without precipitating, ensuring the functionality of engine and fuel system components.
Implementation Method 1
reaction products of polyisobutene which are essentially free of acid groups and are preferably obtained by mixing polyisobutene (A) with a number-average molecular weight Mn of 200 to 10,000 with derivatives of maleic acid (B)
Data Source
Figure 1a~1b
AI summary
The present invention relates to novel uses of corrosion inhibitors in fuels and lubricants.