Polyester Lubricants Low-Temperature Pour Point
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Solution Overview
Problem
Existing polyesters used in lubricating oil compositions have high pour points, making them unsuitable for low-temperature applications, and they do not maintain an advantageous temperature/viscosity behavior with high viscosity indices.
Innovation Solution
Development of novel polyesters formed by reacting a mixture of aliphatic dicarboxylic acids, branched monoalcohols, and polyols with specific hydroxyl functionalities, which exhibit improved low-temperature properties and high viscosity indices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional polyesters with higher viscosity are used to improve lubrication performance, then viscosity index is improved, but pour point increases making them unsuitable for low-temperature applications
Solution Approach 1:
The patent changes the chemical composition parameters of the polyester by using specific dicarboxylic acids (adipic, suberic, sebacic, dodecanedioic acid) combined with Guerbet alcohols and polyols in controlled ratios. This compositional parameter change achieves both high viscosity index (150-200) and low pour point (below -30°C, preferably below -40°C), resolving the contradiction between lubrication performance and low-temperature fluidity
Solution Approach 2:
The patent creates a composite polyester structure by esterifying multiple components: dicarboxylic acids providing backbone structure, Guerbet alcohols (10-20 carbon atoms with specific branched structure) providing low-temperature properties, and polyols (glycerol, pentaerythritol, trimethylolpropane) providing crosslinking and viscosity control. This composite approach achieves simultaneous optimization of viscosity index and pour point
2Quantity of substance
If complex polyesters are used to achieve higher viscosity for heavy-duty applications, then viscosity range is expanded, but pour point remains above -30°C reducing low-temperature operability
Solution Approach 1:
The patent achieves high viscosity (30-300 cSt at 38°C) through controlled molecular weight and crosslinking density by selecting specific polyol content (0.1-20 wt%) and molecular weight of dicarboxylic acid components (5-20 carbon atoms). Simultaneously, the Guerbet alcohol structure with its specific branched configuration ensures pour point remains below -30°C, resolving the contradiction between achieving heavy-duty viscosity and maintaining low-temperature fluidity
3Temperature
If polyesters with improved low-temperature properties are developed, then pour point is reduced, but viscosity index may decrease affecting overall temperature/viscosity behavior
Solution Approach 1:
The patent optimizes the carbon chain length of dicarboxylic acids (5-20 atoms, preferably 6-12) and Guerbet alcohols (10-20 carbon atoms) to achieve the right balance. The specific ratio of linear to branched components, along with controlled polyol content (0.1-20 wt%), ensures pour point below -30°C while maintaining viscosity index of 150-200, resolving the contradiction between low-temperature properties and overall temperature/viscosity stability
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 novel polyesters demonstrate pour points below -60 °C and maintain a high viscosity index, ensuring effective lubrication at low temperatures while maintaining thermal stability and hydrolytic stability.
Implementation Method 1
The novel polyesters demonstrate pour points below -60 °C and maintain a high viscosity index, ensuring effective lubrication at low temperatures while maintaining thermal stability and hydrolytic stability
Data Source
Figure 1
AI summary
The presently claimed invention is directed to novel polyesters which are obtainable by reacting a mixture comprising at least one C8-C20 Guerbet alcohol, at least one aliphatic or cycloaliphatic dicarboxylic acid and at least one polyol with a hydroxyl functionality in the range of ≥ 2 to≤ 6 and the use of these polyesters as a component of lubricating oil compositions.