Rubber Composition Using HDPA for Low Viscosity and Cured Rigidity
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Solution Overview
Problem
Existing rubber compositions face a challenge in reducing uncured viscosity for easier processing while maintaining or improving cured rubber's rigidity and cohesiveness, as adding plasticizers often compromises cured properties.
Innovation Solution
Incorporating 3-hydroxydiphenylamine (3-HDPA) or 4-hydroxydiphenylamine into rubber compositions without a methylene donor, such as hexamethylenetetramine, to reduce uncured viscosity and enhance cured cohesiveness and rigidity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If plasticizers such as petroleum derived oils and low molecular weight resins are added to reduce uncured viscosity, then processing is improved, but cured rigidity and cohesive properties are degraded
Solution Approach 1:
The patent changes the chemical parameters of the rubber composition by incorporating specific compounds (3-hydroxydiphenylamine and/or 4-hydroxydiphenylamine) with defined molecular structures and functional groups. These compounds modify the viscosity-rigidity balance through chemical interaction rather than physical dilution, achieving lower uncured viscosity without compromising cured strength
Solution Approach 2:
The patent creates a composite rubber composition system by combining diene elastomer with hydroxydiphenylamine compounds and optionally with methylene donors. This composite approach allows the hydroxydiphenylamine to serve multiple functions: reducing uncured viscosity through molecular interaction while simultaneously contributing to cured cohesiveness through chemical bonding mechanisms
2Force
If 3-hydroxydiphenylamine or 4-hydroxydiphenylamine are added to reduce uncured viscosity, then uncured viscosity decreases, but cured cohesiveness and rigidity must be maintained
Solution Approach 1:
The patent utilizes the specific chemical parameters of hydroxydiphenylamine compounds (molecular weight, functional group configuration, aromatic ring structure) to achieve dual effects: the compounds interact with rubber polymer chains to reduce uncured viscosity while their chemical structure enables participation in cured network formation, thereby maintaining or enhancing cured cohesiveness and rigidity
Solution Approach 2:
The hydroxydiphenylamine compounds perform multiple functions simultaneously: they act as viscosity modifiers to reduce uncured state resistance to flow, and they serve as cohesiveness enhancers through chemical bonding in the cured state. This multi-functionality resolves the contradiction by having a single additive class address both viscosity reduction and strength maintenance
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 addition of HDPA effectively decreases uncured viscosity and increases elongational and tearing strain at break without reducing cured rigidity, as demonstrated by improved Mooney viscosity and MA10 modulus measurements.
Implementation Method 1
The particular invention uses 3-hydroxydiphenylamime or 4-hydroxydiphenylamine or their combinations in a rubber composition yielding a rubber composition having a low uncured viscosity for rubber processing
Implementation Method 2
the addition of HDPA effectively decreases uncured viscosity and increases elongational and tearing strain at break without reducing cured rigidity
Data Source
AI summary
A rubber composition is disclosed and more particularly, a rubber composition having low uncured viscosity for better green rubber handling and high cured cohesiveness desired cured article properties, methods for making them and articles made from such rubber compositions. Particularly the invention uses 3-hydroxydiphenylamine or 4-hydroxydiphenylamine or their combinations in a rubber composition yielding a rubber composition having a low uncured viscosity for rubber processing and a high cured cohesion and rigidity for the cured rubber product. Such a composition is particularly suitable for rubber applications including tires.