Rubber Composition Balancing Durability and Hysteresis
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Solution Overview
Problem
Existing rubber compositions face a challenge in achieving a balance between durability and hysteresis properties, with liquid diene polymers often adversely affecting the hysteresis properties.
Innovation Solution
A rubber composition comprising an elastomer matrix with a first diene elastomer bearing a SiOR function, a reinforcing inorganic filler, a hydrocarbon resin, a liquid plasticizer with a vegetable oil, and a liquid diene polymer, where the hydrocarbon resin content is higher than the liquid diene polymer, and the vegetable oil content is higher than one-third of the liquid diene polymer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If liquid diene polymer is added to improve durability, then durability is improved, but hysteresis property deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters of the liquid plasticizer system by specifying that vegetable oil content must be higher than one-third of the liquid diene polymer content, and hydrocarbon resin content must be higher than liquid diene polymer content. This parameter control modifies the plasticizer's interaction with the rubber matrix to achieve both improved durability and acceptable hysteresis properties.
Solution Approach 2:
The patent uses a composite plasticizer system comprising three components: liquid diene polymer, vegetable oil, and hydrocarbon resin. This composite approach allows the plasticizer to simultaneously provide durability enhancement through the liquid diene polymer while the vegetable oil and hydrocarbon resin components help maintain hysteresis properties by modifying the overall plasticizer-rubber interaction.
2Ease of manufacture
If hydrocarbon resin content is increased to improve processing, then processing is improved, but plasticizer efficiency may deteriorate
Solution Approach 1:
The patent establishes specific parameter relationships: hydrocarbon resin content must be higher than liquid diene polymer content, and vegetable oil content must be higher than one-third of liquid diene polymer content. These parameter constraints ensure that while hydrocarbon resin provides processing benefits, the overall plasticizer system maintains sufficient efficiency through the balanced composition of all three components.
3Ease of operation
If vegetable oil content is increased to improve plasticizing effect, then plasticizing effect is improved, but cost increases
Solution Approach 1:
The patent optimizes the vegetable oil content by specifying it must be higher than one-third of the liquid diene polymer content but not excessive. This parameter control ensures sufficient plasticizing effect is achieved while avoiding unnecessary cost increase, as vegetable oil is typically more expensive than synthetic plasticizers.
Data Source
AI summary
A rubber composition is based on at least an elastomer matrix, a reinforcing filler comprising a reinforcing inorganic filler, and a plasticizing agent comprising a hydrocarbon resin and a liquid plasticizer comprising a vegetable oil and a liquid diene polymer bearing at least one silane function, wherein the amount in phr of hydrocarbon resin is higher than that of the liquid diene polymer, and wherein the amount in phr of vegetable oil is higher than one-third of the amount in phr of the liquid diene polymer.