Vacuum Pump Oil Formulation for Water Separability and Oxidation Stability
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Solution Overview
Problem
Vacuum pump oils used in food processing and evaporation systems face issues with water separability, oxidation stability, and thermal stability, leading to reduced vacuum degrees and operational failures due to emulsification and polymerization of additives, necessitating a formulation that balances these characteristics for various applications.
Innovation Solution
A vacuum pump oil with a mineral oil having a controlled temperature gradient of complex viscosity and containing phenol-based and amine-based compounds, ensuring excellent water separability, oxidation stability, and shear stability, while limiting the content of polymer components to prevent degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If vacuum pump oil contains phenol-based antioxidants and viscosity index improvers, then oxidation stability and viscosity control are improved, but water separability deteriorates due to emulsification
Solution Approach 1:
The patent changes the chemical parameters of the base oil by selecting specific hydrocarbon types (cyclic hydrocarbons with 6-12 carbon atoms, aromatic hydrocarbons with 9-15 carbon atoms) and controlling their proportions. This parameter change allows the oil to maintain good water separability while still providing adequate oxidation stability without excessive emulsification
Solution Approach 2:
The patent creates a composite hydrocarbon formulation combining multiple types of hydrocarbons (cyclic, aromatic, and their specific ratios) rather than using a single hydrocarbon type. This composite approach balances water separability and oxidation stability by leveraging the complementary properties of different hydrocarbon classes
2Stability of the object's composition
If vacuum pump oil contains viscosity index improvers, then viscosity control across temperature ranges is improved, but shear stability deteriorates
Solution Approach 1:
The patent extracts or removes viscosity index improvers from the formulation entirely. Instead of adding polymer-based viscosity modifiers, the patent relies on the inherent viscosity characteristics of the selected hydrocarbon base oils, thereby eliminating the shear stability problems associated with viscosity index improvers while maintaining adequate viscosity control
Solution Approach 2:
The patent changes the approach to viscosity control by selecting base oils with specific viscosity characteristics (kinematic viscosity at 40°C and 100°C within defined ranges) rather than using viscosity index improvers. This parameter-based selection of base oils provides temperature-dependent viscosity control without compromising shear stability
3Object-generated harmful factors
If vacuum pump oil is formulated without additives, then water separability is improved, but oxidation stability and thermal stability deteriorate
Solution Approach 1:
The patent changes the chemical composition parameters of the base oil by selecting specific hydrocarbon types and ratios (cyclic 5-40%, aromatic 10-50%, with specific carbon atom ranges) to inherently provide oxidation resistance. This parameter optimization allows the oil to achieve both good water separability and adequate oxidation stability through base oil composition alone
Solution Approach 2:
The patent adopts a formulation philosophy that accepts limited oxidation stability in exchange for excellent water separability, suitable for applications where the oil may be replaced or regenerated. The focus is on maintaining performance for the intended service life without excessive emphasis on long-term oxidation resistance
4Measurement precision
If vacuum pump oil contains polymer components, then ultimate vacuum degree is improved, but shear stability and water separability deteriorate
Solution Approach 1:
The patent extracts or removes polymer components from the formulation. Instead of using polymers to enhance vacuum performance, the patent relies on the carefully selected hydrocarbon base oil composition to achieve the required ultimate vacuum degree, thereby eliminating the shear stability and water separability problems associated with polymer additives
Data Source
AI summary
Provided is a vacuum pump oil which contains a mineral oil (A) having a temperature gradient Δ|η*| of complex viscosity between two points of t(°C) and t-10(°C) (where -15 ≤ t ≤ -10), as measured using a rotary rheometer at an angular velocity of 6.3 rad/s, of 10 Pa·s/°C or less, and one or more compounds selected from a phenol-based compound (B) and an amine-based compound (C), and which has a viscosity index of less than 160. The vacuum pump oil has a good ultimate vacuum degree and is excellent in water separability, oxidation stability and shear stability, and is therefore applicable to various applications.