Transparent Rubber Shoe Sole Composition Yellowing Stability
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Solution Overview
Problem
Conventional transparent rubber compositions for shoe soles suffer from unsatisfactory transparency, high cost, and yellowing issues, particularly at high temperatures and during storage, while also lacking adequate wear resistance and maintaining tensile strength and hardness.
Innovation Solution
A rubber composition incorporating a solution polymerized styrene butadiene rubber (SBR) and styrene butadiene styrene (SBS) thermoplastic rubber with a total styrene content of at least 35% by weight, along with a controlled amount of crosslinking agent, silane coupling agent, and silica, to enhance transparency, wear resistance, and yellowing stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional transparent rubber compositions are used for shoe soles, then transparency is achieved, but yellowing occurs during storage and at high temperatures
Solution Approach 1:
The patent changes the chemical composition parameters by specifying a polymer blend containing 70-90 parts by weight isoprene rubber, 5-30 parts by weight high-cis butadiene rubber, and 5-30 parts by weight solution polymerized styrene butadiene rubber, along with specific antioxidant packages (mixed phenolic antioxidants and mixed phosphite antioxidants) to achieve both transparency and yellowing stability
Solution Approach 2:
The patent creates a composite rubber composition by blending multiple rubber types (isoprene rubber, high-cis butadiene rubber, solution polymerized styrene butadiene rubber) with specific additives (fumed silica, organic peroxides, antioxidants) to achieve synergistic effects that simultaneously provide transparency, wear resistance, and yellowing stability
2Quantity of substance
If conventional transparent rubber compositions are used, then cost is reduced, but wear resistance is insufficient
Solution Approach 1:
The patent develops a composite material system combining isoprene rubber, high-cis butadiene rubber, and solution polymerized styrene butadiene rubber with fumed silica and crosslinking agents to achieve both cost-effectiveness and superior wear resistance through synergistic interactions among components
Solution Approach 2:
The patent optimizes the compositional parameters including the weight ratios of different rubbers, silica content (1-5 parts by weight based on total rubber), and crosslinking agent content to achieve the desired balance between wear resistance and cost
3Illumination intensity
If conventional transparent rubber compositions are used, then transparency is achieved, but yellowing occurs during shoe making and distribution
Solution Approach 1:
The patent incorporates antioxidant packages (mixed phenolic antioxidants and mixed phosphite antioxidants) and crosslinking agents in advance during composition formulation to prevent yellowing during subsequent storage and processing operations, addressing the degradation issue before it occurs
Solution Approach 2:
The patent modifies the chemical composition by specifying precise ranges for antioxidants, crosslinking agents, and rubber blend ratios to enhance the stability parameter, ensuring the composition resists yellowing during extended storage periods and high-temperature processing
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 achieves superior yellowing stability at both high and room temperatures, excellent transparency, and improved wear resistance while maintaining tensile strength and hardness, making it suitable for shoe sole production.
Implementation Method 1
a crosslinking agent
Implementation Method 2
a silane coupling agent
Data Source
AI summary
Provided is a rubber composition for a shoe sole. The rubber composition includes: an elastic polymer including a styrene butadiene rubber (SBR) and a styrene butadiene styrene (SBS) thermoplastic rubber; and a crosslinking agent. The total styrene content of the elastic polymer is at least 35% by weight.