Rubber Composition with Multiple Methylene Acceptors
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Solution Overview
Problem
Rubber compositions used in tire manufacturing often lack sufficient rigidity, and existing reinforcing resins may degrade green viscosity and cured cohesiveness when attempting to enhance rigidity.
Innovation Solution
Incorporating a cross-linkable elastomer composition with a combination of 3-hydroxydiphenylamine or 4-hydroxydiphenylamine as methylene acceptors and Novolac resin or other phenolic compounds as methylene donors, which react to form a three-dimensional reinforcing resin network, improving rigidity without degrading viscosity or cohesiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If reinforcing resins are added to increase rigidity, then rigidity is improved, but green viscosity and cured cohesiveness are degraded
Solution Approach 1:
The patent uses a composite resin system combining multiple methylene acceptors (3-hydroxydiphenylamine, 4-hydroxydiphenylamine, and Novolac resin) with a methylene donor to create a multi-component reinforcing system. This composite approach allows the different resin components to work synergistically, providing enhanced rigidity while maintaining green viscosity and cured cohesiveness through balanced chemical interactions and cross-linking mechanisms.
Solution Approach 2:
The patent optimizes the ratio of different methylene acceptors (3-hydroxydiphenylamine, 4-hydroxydiphenylamine, and Novolac resin) to specific ranges (e.g., 10-30 phr for 3-HDPA, 5-20 phr for 4-HDPA, 5-15 phr for Novolac resin) to achieve the desired balance between rigidity enhancement and maintenance of green viscosity and cured cohesiveness. By carefully controlling the concentration and proportion of each component, the patent resolves the contradiction between improving rigidity and maintaining other critical properties.
2Strength
If single methylene acceptor systems are used, then formulation is simple, but rigidity enhancement is limited
Solution Approach 1:
The patent merges multiple methylene acceptors (3-hydroxydiphenylamine, 4-hydroxydiphenylamine, and Novolac resin) into a single integrated resin system that works synergistically with a methylene donor. This combination allows the system to achieve superior rigidity enhancement compared to single-acceptor systems, while the components are formulated to interact through common chemical mechanisms (methylene bridge formation), thereby managing complexity through functional integration rather than adding independent systems.
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 synergistic effect of using multiple methylene acceptors significantly increases the rigidity of cured rubber compositions, maintaining green viscosity and cohesiveness, making them suitable for high-rigidity applications like tire components without significant degradation.
Implementation Method 1
Many of these resins are classified as being methylene acceptor/donor systems that react together to generate a three-dimensional reinforcing resin network by a condensation reaction.
Implementation Method 2
These reinforcing resins intermix with the rubber polymer chains and, when reacted with a linking agent or with each other, form a three-dimensional network that improves the physical characteristics of the cured rubber composition.
Data Source
AI summary
A tire component comprising a rubber composition having a highly unsaturated diene elastomer and a reinforcing filler with a first methylene acceptor selected from 3- hydroxydiphenylamine, 4-hydroxydiphenylamine or combinations thereof; a second methylene acceptor selected from a Novolac resin, diphenylolmethane, diphenylolethane diphenylolpropane, diphenylolbutane, a naphthol, a cresol or combinations thereof and a methylene donor. A method for manufacturing a tire component includes mixing together components of a rubber composition into a non-productive mix, the components including a highly unsaturated diene elastomer, a reinforcing filler, a first methylene acceptor selected from 3- hydroxydiphenylamine, 4-hydroxydiphenylamine or combinations thereof and a second methylene acceptor selected from a Novolac resin, diphenylolmethane, diphenylolethane diphenylolpropane, diphenylolbutane, a naphthol, a cresol or combinations thereof; and mixing a methylene donor and a vulcanizing agent into the non-productive mix to convert the non¬ productive mix to a productive mix.