Vulcanizable composition for producing a vulcanization bladder
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Solution Overview
Problem
Vulcanization bladders used in tire production are prone to thermal and mechanical stress, leading to limited service life and quality deterioration of pneumatic vehicle tires, particularly when using rayon in the tire carcass, resulting in increased production costs and defects.
Innovation Solution
A vulcanizable composition comprising a high proportion of isobutene-isoprene rubber and halogenated isobutene-isoprene rubber, along with specific additives like phenol-formaldehyde resin and carbon black, enhances the mechanical properties and vapor retention of vulcanization bladders, allowing for extended use without compromising tire quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If conventional vulcanization bladders are used, then initial tire production quality is maintained, but service life is limited due to thermal and mechanical stress
Solution Approach 1:
The patent applies composite materials by combining butyl rubber (providing vapor barrier properties) with chloroprene rubber (providing mechanical strength and thermal resistance). This composite formulation creates a vulcanization bladder that simultaneously achieves extended service life under thermal-mechanical stress and maintains reliable tire production quality over numerous cycles
Solution Approach 2:
The patent modifies the chemical composition parameters of the rubber material by specifying precise proportions of butyl rubber (20-80 parts per 100 parts rubber) and chloroprene rubber (20-80 parts per 100 parts rubber), along with specific vulcanization agents. This parameter optimization enables the bladder to withstand extended thermal-mechanical stress while maintaining quality consistency
2Productivity
If vulcanization bladders are used for extended cycles, then productivity increases, but material failure and production defects occur
Solution Approach 1:
The patent implements beforehand cushioning by incorporating specific anti-aging agents and antioxidants into the rubber compound formulation before the bladder is put into service. This preventive approach cushions against degradation from thermal-mechanical stress accumulated over extended vulcanization cycles, preventing material failure and production defects while maintaining high productivity
3Loss of substance
If aged vulcanization bladders are used, then replacement costs are reduced, but tire quality deteriorates particularly with rayon carcass
Solution Approach 1:
The patent creates a vulcanization bladder formulation that extends the functional life of what would otherwise be a short-living component. By optimizing the rubber compound with specific proportions of butyl and chloroprene rubber along with anti-aging agents, the bladder maintains manufacturing precision for tire quality over extended cycles, reducing replacement frequency and associated costs while ensuring specification compliance even with rayon carcass
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 vulcanization bladders exhibit improved resistance to thermal stress and vapor permeability, enabling numerous vulcanization cycles with consistent tire quality, especially when using rayon in the tire carcass, reducing maintenance and replacement frequency.
Implementation Method 1
The vulcanization bladders exhibit improved resistance to thermal stress
Implementation Method 2
The vulcanization bladders exhibit improved resistance to thermal stress and vapor permeability
Implementation Method 3
a vulcanizable composition for producing a vulcanization bladder, a vulcanizate producible by vulcanizing a corresponding vulcanizable composition
Data Source
AI summary
The invention relates to a vulcanizable composition for producing a vulcanization bellows, comprising: one or more halogenated isobutene-isoprene rubbers in a total amount ranging from 2 to 15 phr, and one or more isobutene-isoprene rubbers in a total amount ranging from 85 to 98 phr.