Silane-Functional Rubber Composition for Durability-Hysteresis Balance
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Solution Overview
Problem
Existing rubber compositions for tires and other rubber articles face a challenge in balancing durability and hysteresis properties, with liquid diene polymers improving durability but adversely affecting hysteresis.
Innovation Solution
A rubber composition comprising an elastomer matrix, a reinforcing inorganic filler, a hydrocarbon resin, a liquid plasticizer comprising vegetable oil, and a liquid diene polymer with silane functions, where the hydrocarbon resin content is higher than the liquid diene polymer, and the vegetable oil content is greater than one-third of the liquid diene polymer, optimizing the balance between durability and hysteresis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If liquid diene polymer is used to improve durability, then durability is improved, but hysteresis property deteriorates
Solution Approach 1:
The invention changes the chemical composition parameters of the plasticizing agent system. Specifically, it uses a liquid diene polymer with controlled molecular weight (Mn: 1000-5000 g/mol) and specific functional group content (0.1-5 mmol/g), combined with vegetable oil in a specific ratio (0.1-2.0 by weight). This parameter optimization allows the system to achieve both improved durability and acceptable hysteresis properties by fine-tuning the molecular characteristics and composition ratios of the plasticizing agents.
Solution Approach 2:
The invention creates a composite plasticizing agent system by combining liquid diene polymer with silane functions and vegetable oil. This composite approach allows the liquid diene polymer to provide durability enhancement through its molecular structure and reactive silane groups, while the vegetable oil component helps maintain favorable hysteresis properties. The synergistic interaction between these two components resolves the contradiction between durability improvement and hysteresis deterioration.
2Ease of manufacture
If hydrocarbon resin content is increased to improve processing, then processing is improved, but durability may be compromised
Solution Approach 1:
The invention optimizes the hydrocarbon resin content within a specific range (5-50 phr) and balances it with liquid diene polymer content (2-20 phr). This parameter control ensures that the hydrocarbon resin provides adequate processing improvement while the liquid diene polymer with silane functions compensates for any potential durability loss. The specific ratio and content ranges are critical to maintaining both processing ease and durability.
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.