RFID Tag Coating Rubber Composition to Prevent Sulfur Bloom
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Solution Overview
Problem
Conventional RFID-tag coating rubber compositions for tires fail to achieve a well-balanced combination of satisfactory communication performance, resistance to cracking, adhesiveness to adjacent rubber members, and elastic modulus, often resulting in poor workability due to sulfur bloom and tackiness issues.
Innovation Solution
An RFID-tag coating rubber composition comprising a rubber component, sulfur with insoluble sulfur content of 6.0 parts or more per 100 parts of rubber, silica in the range of 40 to 100 parts per 100 parts of rubber, and a guanidine-based vulcanization accelerator, such as 1,3-diphenylguanidine, which improves elastic modulus and adhesiveness while preventing sulfur bloom.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the sulfur content is increased to improve elastic modulus, then the elastic modulus is improved, but sulfur bloom occurs and adhesiveness deteriorates
Solution Approach 1:
The patent changes the physical-chemical parameters of sulfur by using insoluble sulfur (sulfur with particle size of 0.1 μm or more) instead of conventional soluble sulfur. This parameter change allows the sulfur to remain dispersed in the rubber composition without blooming, while still providing the necessary elastic modulus for the coating rubber.
Solution Approach 2:
The patent uses insoluble sulfur which can be used in higher quantities (6.0 parts by mass or more per 100 parts of rubber component) without causing sulfur bloom. This allows achieving the required elastic modulus through material quantity adjustment rather than relying on soluble sulfur that would bloom and deteriorate adhesiveness.
2Strength
If the sulfur content is increased to improve elastic modulus, then the elastic modulus is improved, but the adhesiveness to adjacent rubber member deteriorates
Solution Approach 1:
The patent changes the state of sulfur from soluble to insoluble, which fundamentally alters its behavior in the rubber composition. Insoluble sulfur does not migrate to the surface (bloom) and therefore maintains the adhesiveness and tackiness required for proper bonding to adjacent rubber members, while still providing the necessary elastic modulus.
3Ease of manufacture
If conventional coating rubber composition is used, then the manufacturing process is simple, but the communication performance is insufficient
Solution Approach 1:
The patent creates a composite rubber composition by combining insoluble sulfur with specific rubber components and vulcanization accelerators. This composite formulation achieves both good communication performance (through controlled sulfur dispersion without blooming) and satisfactory workability (through maintained adhesiveness and tackiness).
Solution Approach 2:
The patent adjusts multiple parameters simultaneously: sulfur content (6.0 parts by mass or more per 100 parts of rubber component), sulfur particle size (0.1 μm or more), and vulcanization accelerator type (guanidine-based). These parameter changes collectively improve communication performance while maintaining workability.
4Reliability
If the silica content is increased to improve communication performance, then the communication performance is improved, but the resistance to cracking may deteriorate
Solution Approach 1:
The patent optimizes the silica content within a specific range (20 to 100 parts by mass per 100 parts of rubber component) rather than using excessive amounts. This controlled parameter adjustment improves communication performance by reducing signal interference while maintaining the resistance to cracking through balanced formulation with insoluble sulfur and appropriate vulcanization.
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 balanced communication performance, resistance to cracking, and adhesiveness, enhancing the durability and productivity of tires by maintaining satisfactory elastic modulus and preventing sulfur bloom, thus improving workability in tire molding processes.
Implementation Method 1
a guanidine-based vulcanization accelerator
Implementation Method 2
the sulfur includes insoluble sulfur
Data Source
AI summary
An RFID-tag coating rubber composition comprises: a rubber component; sulfur; silica; and a guanidine-based vulcanization accelerator, wherein the sulfur includes insoluble sulfur, and a content of the sulfur is 6.0 parts by mass or more with respect to 100 parts by mass of the rubber component. The RFID-tag coating rubber composition can achieve satisfactory communication performance, satisfactory resistance to cracking, satisfactory adhesiveness to an adjacent rubber member, and satisfactory elastic modulus simultaneously in a well-balanced manner and also is excellent in workability.