Biodegradable Lubricant Composition for Wind Power Step-Up Gears
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Solution Overview
Problem
Biodegradable lubricating oils used in wind power generators lack sufficient oxidation stability and lubricity, making them unsuitable for long-term use in step-up gears.
Innovation Solution
A biodegradable lubricating oil composition is developed, comprising esters obtained from saturated aliphatic carboxylic acids, straight-chain aliphatic dicarboxylic acids, and polyhydric alcohols, along with a phosphate amine salt, which provides excellent lubricity, oxidation stability, and biodegradability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If a biodegradable lubricating oil with ester base oil is used, then biodegradability is improved, but oxidation stability deteriorates
Solution Approach 1:
The patent uses a composite ester base oil comprising multiple ester components (monoglyceride ester, diglyceride ester, and triglyceride ester) with different molecular structures and properties. This composite approach allows the lubricant to achieve both biodegradability through natural ester composition and oxidation stability through the synergistic effects of different ester types, resolving the contradiction between environmental friendliness and long-term stability.
Solution Approach 2:
The patent carefully controls the molecular weight distribution and composition ratios of the ester components. By optimizing parameters such as the proportion of monoglyceride, diglyceride, and triglyceride esters, and controlling the carbon chain length and degree of saturation, the lubricant achieves enhanced oxidation stability while maintaining biodegradability. The specific parameter ranges (molecular weight 200-1000, composition ratios) are designed to balance these opposing requirements.
2Object-generated harmful factors
If a biodegradable lubricating oil with ester base oil is used, then biodegradability is improved, but lubricity deteriorates
Solution Approach 1:
The patent employs a composite ester system combining monoglyceride esters (providing lubricity through film-forming properties), diglyceride esters (enhancing boundary lubrication), and triglyceride esters (providing bulk lubrication and biodegradability). This multi-component composite approach ensures adequate lubricity across different operating conditions while maintaining biodegradability through the natural ester composition.
Solution Approach 2:
The different ester components perform different lubrication functions at different locations within the lubricant film. Monoglyceride esters provide primary lubrication at the interface, diglyceride esters enhance boundary layer protection, and triglyceride esters provide bulk lubrication and environmental compatibility. This functional differentiation ensures adequate lubricity while maintaining biodegradability.
3Reliability
If PAO base oil is used, then lubricity is improved, but biodegradability deteriorates
Solution Approach 1:
The patent completely changes the base oil chemical composition from synthetic PAO (polyalphaolefin) to natural ester compounds. By controlling the ester molecular weight (200-1000), composition ratios, and saturation level, the lubricant achieves biodegradability while maintaining adequate lubricity through the natural film-forming properties of ester molecules. This fundamental chemical parameter change resolves the contradiction between performance and environmental compatibility.
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 composition maintains effective lubricity and oxidation stability, ensuring long-term performance and biodegradability, making it suitable for step-up gears in wind power generators.
Implementation Method 1
an ester being obtained by reacting a saturated aliphatic carboxylic acid, a straight-chain aliphatic dicarboxylic acid and a polyhydric alcohol together
Implementation Method 2
a phosphate amine salt being obtained by reacting an acidic phosphate with an alkylamine
Implementation Method 3
A so-called gear oil is used to lubricate a gear mechanism used in the step-up gear
Implementation Method 4
the step-up gear oil should be highly biodegradable
Data Source
AI summary
A biodegradable lubricating oil composition includes (A) an ester being obtained by reacting a saturated aliphatic carboxylic acid, a straight-chain aliphatic dicarboxylic acid and a polyhydric alcohol together, the ester having a kinematic viscosity in a range from 400 mm2/s to 1000 mm2/s at 40 degrees C. and an acid value of 0.5 mgKOH/g or less; (B) an ester being obtained by reacting a straight-chain saturated aliphatic carboxylic acid with a polyhydric alcohol, the ester having an acid value of 0.5 mgKOH/g or less; and (C) a phosphate amine salt being obtained by reacting an acidic phosphate with an alkylamine.