Polyamide Grease Thickener for Lithium-Free Mechanical Properties

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Solution Overview

Problem

Existing grease compositions require lithium or polyurea-based thickening agents, which can be costly and may not be environmentally friendly, and there is a need for alternatives that provide equivalent mechanical properties without these components.

Innovation Solution

A polyamide grease thickening agent with a specific molecular structure, including at least four amide bonds and internal aromatic moieties, is used to create a grease composition that is substantially free of lithium and polyurea, achieving comparable performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If lithium or polyurea-based thickening agents are used, then adequate mechanical properties are achieved, but cost increases and environmental friendliness decreases

Engineering Contradiction:

Improvemechanical propertiesVSAvoidcost and environmental impact

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent changes the chemical composition parameters by using polyamide thickening agents with specific molecular weight ranges (450-3500 g/mol) and specific structural features (at least 4 amide bonds, para-substituted aromatic moieties) to replace traditional lithium or polyurea thickeners, achieving comparable mechanical properties with improved environmental profile and potential cost reduction

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite grease formulation combining polyamide thickening agent with base oil and optional additives, where the polyamide component provides the necessary mechanical properties through its specific molecular structure including multiple amide bonds and aromatic moieties, replacing the need for lithium or polyurea-based composite systems

Inventive Principle:

Principle #40Composite materials

2Ease of manufacture

If polyamide grease thickening agent with specific structure is used, then environmental friendliness and cost are improved, but achieving equivalent mechanical properties becomes challenging

Engineering Contradiction:

Improvecost and environmental impactVSAvoidmechanical properties

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent optimizes critical parameters including molecular weight (450-3500 g/mol), number of amide bonds (at least 4), and aromatic moiety substitution patterns (para-position) to achieve the desired balance between environmental benefits and mechanical performance, ensuring the polyamide thickener meets NLGI and dropping point specifications

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS20250313772A1Grease thickening agent

Publication Date: 2025.10.09 INV NYLON CHEMICALS AMERICAS LLC

AI summary

The present disclosure provides a polyamide grease thickening agent having the structure according to Formula I: (MCA-DA-)(PCA-DA)y-PCA-(DA-PCA)y(-DA-MCA) (I). In Formula I, at each occurrence PCA is independently a reacted polycarboxylate, at each occurrence MCA is independently a reacted monocaboxylate, at each occurrence DA is independently a reacted n-alkyl diamine, and y is 0 or a non-zero integer. Additionally, in Formula I, a weight-average molecular weight of the polyamide grease thickener is in a range of from about 450 g/mol to about 2600 g/mol. Additionally, in Formula I, the structure includes at least 4 amide bonds and at least two internal aromatic moieties are di-substituted in a para position.