Hydrogenated Nitrile Rubber Microgel Composition High-Temperature Strength

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Solution Overview

Problem

Vulcanized rubber articles based on hydrogenated nitrile rubbers lack improved mechanical properties, especially at high temperatures such as 130°C, and exhibit reduced aging resistance, necessitating enhanced hardness and tension values across various temperatures.

Innovation Solution

A vulcanizable composition combining hydrogenated nitrile rubber, unsaturated carboxylic acid or its salt, peroxide, and microgels with a glass transition temperature less than -20°C, which improves mechanical properties at high temperatures and maintains hardness at room temperature.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If microgels containing double bonds (R rubbers) are used to improve mechanical properties, then mechanical properties at high temperatures are improved, but aging resistance deteriorates

Engineering Contradiction:

Improvemechanical propertiesVSAvoidaging resistance

Core Design Contradiction:

StrengthVSReliability

Solution Approach 1:

The patent changes the glass transition temperature parameter of the microgel from conventional values above -20°C to specifically below -20°C. This parameter change allows the microgel to maintain a rubbery state at high operating temperatures (130°C) while providing improved mechanical properties and unexpected aging resistance, resolving the contradiction between strength and reliability.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite system by combining hydrogenated nitrile rubber with specially designed microgels having Tg < -20°C. This composite material approach allows the microgel to function as a reinforcing phase that improves mechanical properties while the specific Tg selection prevents the expected degradation in aging resistance, simultaneously achieving both strength and reliability improvements.

Inventive Principle:

Principle #40Composite materials

2Reliability

If higher hydrogenation nitrile rubbers are used to improve aging resistance, then aging resistance is improved, but mechanical properties at high temperatures are insufficient

Engineering Contradiction:

Improveaging resistanceVSAvoidmechanical properties

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The patent combines hydrogenated nitrile rubber with microgels having Tg < -20°C to create a composite material system. The microgel phase acts as a reinforcing agent that specifically enhances mechanical properties at high temperatures while the hydrogenated nitrile rubber matrix maintains good aging resistance, achieving both goals simultaneously.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent introduces microgels as localized reinforcing structures within the rubber matrix. These microgels with Tg < -20°C are distributed throughout the material to provide local enhancement of mechanical properties at high temperatures, while the overall composition maintains good aging resistance through the hydrogenated nitrile rubber base.

Inventive Principle:

Principle #3Local quality

3Strength

If salts of unsaturated carboxylic acids are added to improve hardness and modulus, then hardness and modulus are improved, but the property profile at high temperatures requires further improvement

Engineering Contradiction:

Improvehardness and modulusVSAvoidproperty profile at high temperatures

Core Design Contradiction:

StrengthVSReliability

Solution Approach 1:

The patent creates a composite system combining hydrogenated nitrile rubber, salts of unsaturated carboxylic acids, and microgels with Tg < -20°C. The microgel phase provides additional reinforcement that specifically enhances high-temperature mechanical properties beyond what the salt additives alone can achieve, while maintaining room temperature hardness through the synergistic interaction of all components.

Inventive Principle:

Principle #40Composite materials

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 composition significantly enhances mechanical properties at 130°C and after hot air storage at 150°C, while maintaining room temperature hardness and reducing stickiness during the production process, allowing for easier mold removal and unchanged vulcanization times.

Implementation Method 1

at least one microgel with a glass transition temperature of less than -20°C

Methodology Applied

Scientific EffectGlass transition:

Implementation Method 2

Vulcanizates with improved aging resistance are obtained based on higher hydrogenation nitrile rubbers, which are vulcanized with sulfur according to EP-A-0 112 109, with the help of organic peroxides according to DE-A-34 38 414 or with inorganic peroxides according to EP-A-0 383 127

Methodology Applied

Scientific EffectPeroxide vulcanization: Oxidation

Data Source

PatentEP1801125B1Microgel-containing vulcanizable composition based on hydrogenated nitrile rubber

Publication Date: 2009.03.25 ARLANXEO DEUT GMBH

AI summary

A vulcanizable composition comprises one or more hydrogenated nitrile rubber, one or more unsaturated carboxylic acid and/or their salts, peroxide(s) and microgel(s) having glass transition temperature of less than -20[deg]C. An independent claim is included for manufacture of vulcanizable composition, which involves mixing hydrogenated nitrile rubber, unsaturated mono- or dicarboxylic acid having 3-10 carbon atoms and/or their salts, peroxide, and microgel.