Cyclic Polyol Rubber Composition High-Temperature Crack Resistance

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Solution Overview

Problem

The rubber composition in existing technologies lacks excellent crack resistance and elongation at break at high temperatures, particularly at 100°C, which is a limitation for vulcanized rubber applications.

Innovation Solution

A rubber composition incorporating a cyclic polyol compound with a hydrocarbyl group and hydroxy group, along with carbon black and a diene-based rubber component, specifically formulated to enhance interaction and processability, thereby improving crack resistance and high-temperature elongation properties.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If conventional rubber composition with carbohydrate and methoxylated methylolmelamine resin is used, then bonding properties with steel cord and hardness are improved, but crack resistance and elongation at break at high temperature deteriorate

Engineering Contradiction:

Improvebonding properties with steel cordVSAvoidcrack resistance at high temperature

Core Design Contradiction:

StrengthVSReliability

Solution Approach 1:

The patent changes the chemical structure parameters of the polyol component by specifying cyclic structures with 2-10 rings and particular hydroxyl group configurations, which fundamentally alters the crosslinking behavior to achieve both bonding strength and high-temperature crack resistance

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite crosslinking system combining cyclic polyol compound with specific structural features (multiple rings, hydroxyl groups) with carbon black and diene-based rubber, where the synergistic interaction between components achieves properties that individual components cannot provide alone

Inventive Principle:

Principle #40Composite materials

2Ease of manufacture

If conventional rubber composition is used, then processing is simplified, but elongation at break at high temperature deteriorates

Engineering Contradiction:

Improveprocessing simplicityVSAvoidelongation at break at high temperature

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent optimizes the hydroxyl group content parameter (0.1-4 parts by mass) and cyclic structure configuration to achieve optimal balance between processing ease and high-temperature elongation performance through controlled crosslinking density

Inventive Principle:

Principle #35Parameter changes

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 resulting crosslinked rubber exhibits enhanced crack resistance and elongation at break at high temperatures, making it suitable for applications such as tires and conveyor belts.

Implementation Method 1

a cyclic polyol compound having a hydrocarbyl group and a hydroxy group and having two or more and ten or less cyclic structures; carbon black; and a rubber component, wherein the rubber component contains a diene-based rubber and the diene-based rubber contains a natural rubber

Methodology Applied

Scientific EffectAdsorption: Adsorption

Data Source

PatentEP3456772B1Rubber composition, crosslinked rubber, tire and rubber article

Publication Date: 2020.07.22 BRIDGESTONE CORP

AI summary

The present invention is concerned with a rubber composition containing a cyclic polyol compound having a hydrocarbyl group and a hydroxy group and having two or more and ten or less cyclic structures; carbon black; and a rubber component. A crosslinked rubber obtained from such a rubber composition is excellent in crack resistance and elongation at break at a high temperature.