Polymeric Polyol Esters for Metalworking Fluids
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Solution Overview
Problem
Polymeric polyol esters used in metalworking applications face compatibility issues with certain lubricant basestocks at elevated temperatures, leading to reduced solubility and increased acid numbers, which can affect their performance as additives in metalworking fluids.
Innovation Solution
A polymeric polyol ester formulation comprising 30-60 wt% linear monocarboxylic acid, 5-30 wt% alkanedioic acid, 25-35 wt% alk(en)yl substituted succinic acid or anhydride, 6-18 wt% trihydric alcohol, and 3-12 wt% pentaerythritol, with partial replacement of pentaerythritol by trimethylolpropane to enhance solubility and reduce acid numbers, is developed to improve compatibility and solubility in hydrocarbon oils.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polymeric polyol esters are used as metalworking additives, then lubrication performance is improved, but compatibility with lubricant basestocks deteriorates at elevated temperatures
Solution Approach 1:
The patent modifies the molecular structure parameters of polymeric polyol esters by incorporating specific fatty acid chain lengths (C12-C20), controlling molecular weight ranges (1,000-100,000), and adjusting the ratio of polyol to acid components to improve thermal stability and basestock compatibility while maintaining lubrication performance
Solution Approach 2:
The invention creates composite polymeric polyol ester structures combining multiple fatty acid types (saturated and unsaturated), various polyols (mono-, di-, tri-, and tetrahydric alcohols), and controlled molecular architectures to achieve both excellent lubrication properties and compatibility with hydrocarbon, group II, and group III basestocks at elevated temperatures
2Force
If polymeric polyol esters are used in metalworking fluids, then friction reduction is achieved, but solubility in carrier fluids decreases at high temperatures
Solution Approach 1:
The patent adjusts solubility parameters by controlling molecular weight (1,000-100,000), selecting specific fatty acid chain lengths (C12-C20), and optimizing the polyol-to-acid ratio to maintain adequate solubility in hydrocarbon and water carrier fluids across the operating temperature range while providing effective friction reduction
3Strength
If polymeric polyol esters are synthesized with high molecular weight, then lubrication film strength is improved, but acid numbers increase
Solution Approach 1:
The patent optimizes the synthesis parameters by controlling the polyol-to-acid molar ratio, selecting specific fatty acid types with appropriate chain lengths, and managing molecular weight (1,000-100,000) to achieve sufficient lubrication film strength while minimizing acid number formation through controlled polymerization and esterification reactions
Data Source
AI summary
Polymeric polyol ester additives for metal working applications are described that have lower pour points and improved solubility in API Group I I and I I I basestocks. The polymeric polyol ester contains linear moiiocarboxylic acid, alkanedioic acid, alk(en)yl substituted succinic acid or anhydride, trihydric alcohol and pentaerythritol.