Low Vapor Pressure Solvent Cement for Tire Tread Splices
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Solution Overview
Problem
Conventional solvent-based adhesives for tire tread splices have high volatile organic emissions and may not provide sufficient cohesive and adhesive strength, leading to delamination issues during tire building and curing.
Innovation Solution
A cement composition using an organic solvent with a vapor pressure less than 0.01 kPa at 20°C, such as hydrotreated middle petroleum distillate, is applied to the tire tread splice, reducing delamination and VOC emissions while maintaining adhesion strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If solvent-based adhesive rubber composition is applied to increase building tack and adhesive strength, then adhesion strength is improved, but volatile organic emissions increase
Solution Approach 1:
The patent changes the physical-chemical parameter of the solvent by selecting compounds with specific vapor pressure ranges (less than 0.01 kPa at 20°C). This parameter change maintains the solvent's ability to provide molecular mobility and wetting for adhesion while dramatically reducing volatile organic emissions, thus resolving the contradiction between adhesive strength and environmental harm.
2Strength
If conventional solvent-based cement is used to ensure sufficient building tack, then adhesion is improved, but delamination occurs during tire curing
Solution Approach 1:
The patent selects solvents with specific vapor pressure parameters (less than 0.01 kPa at 20°C) that evaporate at controlled rates during the curing process. This prevents premature evaporation that would cause delamination, while still providing sufficient molecular mobility for building tack during application. The parameter change ensures both adhesion and reliability.
3Strength
If high volatility solvent is used to increase molecular mobility and wetting, then adhesion is improved, but VOC emissions increase
Solution Approach 1:
The patent identifies and applies the vapor pressure parameter as the critical control variable. By selecting solvents with vapor pressure less than 0.01 kPa at 20°C, the patent achieves the optimal balance: sufficient molecular mobility and wetting capability for good adhesion, while minimizing VOC emissions. This parameter-based approach resolves the contradiction between adhesion performance and environmental impact.
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 use of this solvent-based cement composition significantly reduces delamination and volatile organic compound emissions while achieving equivalent or superior adhesion strength compared to traditional solvents, making it suitable for tire fabrication.
Implementation Method 1
The solvents increase the molecular mobility of the polymers in the adhesive and increase the wetting of the rubber substrate
Implementation Method 2
The solvents increase the molecular mobility of the polymers in the adhesive and increase the wetting of the rubber substrate (e.g., tread ends)
Data Source
AI summary
A cement composition for rubber or tire fabrication is disclosed. The cement composition comprises 100 parts by weight of an elastomer and from 500 to 4000 parts by weight, per 100 parts by weight of elastomer (phr), of an organic solvent having a vapor pressure of less than 0.01 kPa at 20°C. 8. Also, a tire comprising a component comprising such cement and a method of making or retreading a pneumatic tire using such cement is described.