Grease composition

A grease composition combining polyoxyalkylene derivatives with specific solid lubricants enhances load-bearing and heat resistance under high temperature and pressure, addressing decomposition and swelling issues in existing grease technologies.

US20250207051A1Pending Publication Date: 2025-06-26KYODO YUSHI CO LTD
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Patent Information

Application Number
US18/849083
Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
Priority Date
2022-03-25
Filing Date
2023-03-27
Publication Date
2025-06-26

AI Technical Summary

Technical Problem

Existing grease compositions using polyoxyalkylene or polyoxyalkylene derivatives as base oils face challenges in maintaining load-bearing performance and heat resistance under high temperature and high surface pressure due to decomposition from reactive additives and poor dispersion of non-reactive additives, leading to reduced service life and swelling of sealing materials like EPDM or natural rubber.

Method used

A grease composition combining polyoxyalkylene or ether derivatives as base oil with polytetrafluoroethylene as a first solid lubricant and melamine cyanurate, tricalcium phosphate, or sodium sebacate as a second solid lubricant, without using reactive additives, to enhance load-bearing performance and thermal stability.

Benefits of technology

The composition improves load-bearing performance and heat resistance, preventing base oil decomposition and swelling of sealing materials, even under harsh conditions, while maintaining excellent adhesion and lubrication properties.

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Abstract

A grease composition includes a base oil, a thickener, and an additive. The base oil is at least one selected from the group consisting of polyoxyalkylene, ether derivatives of polyoxyalkylene, and mixtures thereof. The additive includes polytetrafluoroethylene as a first solid lubricant and at least one selected from the group consisting of melamine cyanurate, tricalcium phosphate, and sodium sebacate as a second solid lubricant. The content of the second solid lubricant is 0.5% by mass or more based on the total mass of the composition.
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