Biodegradable Lubricant Composition With Elastomer Seal Compatibility
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Solution Overview
Problem
Existing lubricants used in marine and land-based applications contaminate the environment due to leaks, posing a risk to marine ecosystems and soil, and often cause damage to seal materials due to incompatibility, necessitating the development of biodegradable and environmentally friendly lubricants with improved compatibility with elastomer seals.
Innovation Solution
A lubricant composition comprising oil-soluble polyalkylene glycol, ester compounds, and a synergistic additive mixture of antioxidants and anticorrosives, including neutral alkali metal and alkaline earth metal salts, to enhance compatibility and biodegradability, reducing environmental impact and seal damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If ester-based lubricants are used to improve biodegradability and environmental compatibility, then biodegradability is improved, but seal material compatibility deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters of the base oil from conventional mineral oils to a specific blend of synthetic esters (10-50 wt%) and polyalkylene glycols (50-90 wt%). This parameter change maintains biodegradability while improving seal compatibility through the synergistic effect of the blended composition, particularly the interaction between ester and polyglycol components that reduces seal material degradation.
Solution Approach 2:
The patent creates a composite base oil system combining two different synthetic lubricant chemistries (esters and polyalkylene glycols) in specific ratios. This composite approach allows the lubricant to exhibit properties of both components: the biodegradability and lubrication properties of esters combined with the seal compatibility and water solubility of polyalkylene glycols, thereby resolving the contradiction between environmental friendliness and seal material compatibility.
2Reliability
If polyalkylene glycol is used as base oil to improve seal compatibility, then seal material compatibility is improved, but biodegradability deteriorates
Solution Approach 1:
The patent adjusts the concentration parameter of polyalkylene glycol within a specific range (50-90 wt%) rather than using it as the sole base oil. By controlling this parameter and combining it with ester components, the lubricant achieves adequate seal compatibility while the ester portion ensures biodegradability, thus resolving the contradiction.
Solution Approach 2:
The patent employs a composite base oil system where polyalkylene glycol (50-90 wt%) provides seal compatibility and lubrication properties, while the ester component (10-50 wt%) contributes biodegradability. This composite structure allows both requirements to be met simultaneously through the synergistic interaction of the two components.
3Reliability
If mineral oil is used as base oil to improve lubrication properties, then lubrication performance is improved, but environmental compatibility deteriorates
Solution Approach 1:
The patent fundamentally changes the base oil type from mineral oil to a synthetic blend of esters and polyalkylene glycols. This parameter change maintains adequate lubrication performance through the synthetic chemistry while dramatically improving biodegradability and environmental compatibility, eliminating the contradiction present in mineral oil-based lubricants.
Solution Approach 2:
The patent substitutes mineral oil (a petroleum-derived product) with synthetic ester and polyalkylene glycol base oils. This substitution replaces a non-biodegradable lubricant with biodegradable synthetic alternatives that provide comparable or superior lubrication properties while being environmentally friendly, thus resolving the contradiction between performance and environmental compatibility.
Data Source
AI summary
A lubricant composition comprising an oil-soluble polyalkylene glycol; an ester compound selected from the group of natural esters and synthetic esters, and combinations thereof; and an additive mixture comprising an antioxidant and an anticorrosive, wherein the anticorrosive is selected from neutral alkali metal and alkaline earth metal salts of sulfonic acids, carboxylic acids, naphthoic acids, naphthenic acids, benzoic acids and phosphoric acids, and derivatives and combinations thereof.