Use of a polyalkoxysiloxane-based oil as a lubricating agent
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Solution Overview
Problem
Silicone oils, particularly polydimethylsiloxanes, have low lubricity and poor compatibility with additives, limiting the modification and optimization of lubricating compositions, while other lubricants like polyalphaolefins and phosphate esters pose safety and health risks.
Innovation Solution
Development of polyalkoxysiloxane derivatives with improved lubricity and compatibility, allowing for the formulation of lubricating compositions that can be modified and optimized with various additives, including flame retardants, to enhance properties such as low friction and thermal resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If polydimethylsiloxanes are used as base oil, then good fluidity and high viscosity index are achieved, but lubricity is very low
Solution Approach 1:
The invention changes the chemical parameters of the silicone base oil by introducing alkoxy groups (methoxy, ethoxy, propoxy, or butoxy) at positions 2 and 6 of the phenyl ring in the polyalkylphenylsiloxane structure. This chemical modification transforms the base oil properties to achieve both high viscosity index (≥200) and improved lubricity with coefficients of friction ≤0.15, resolving the contradiction between fluidity and lubrication performance.
2Temperature
If polydimethylsiloxanes are used as base oil, then thermal resistance and safety are improved, but compatibility with additives is very low
Solution Approach 1:
The invention modifies the chemical structure parameters by replacing methyl groups with alkoxy-substituted phenyl groups at specific positions. This structural change maintains the thermal resistance properties of silicone oils while introducing polar groups that enhance compatibility with conventional lubricant additives, allowing effective formulation of lubricating compositions.
3Reliability
If other lubricants like polyalphaolefins or phosphate esters are used, then lubricity is improved, but safety and health risks increase
Solution Approach 1:
The invention creates a composite chemical structure combining the safe silicone backbone with phenyl and alkoxy functional groups. This composite molecular architecture achieves lubricity comparable to polyalphaolefins and phosphate esters while maintaining the inherent safety and environmental compatibility of silicone-based materials, avoiding the toxicological issues of alternative lubricants.
Data Source
AI summary
The present invention relates to the use of a polyalkoxysiloxane base oil of formula (I)in which each R1 is independently a C1 to C4 alkyl group or a phenyl, each R2 is independently a C2 to C22 alkyl or alkenyl group or a phenyl, R3 is either a methyl group or a CH2 group connected to the other R3 group by a single bond, thus forming a ring in which the 2 terminal silicon atoms are connected by a CH2—CH2 bridge, x is an integer between 0 and 50, y is an integer between 1 and 500 and such that the ratio y/x is strictly greater than 0.5, or of a mixture of polyalkoxysiloxane base oils of formula (I), as a lubricating agent.