Seal Member Composition for Long-Term Polymerization Suppression
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Solution Overview
Problem
Existing seal members made from polytetrafluoroethylene (PTFE) allow polymerizable monomers to soak in and polymerize, causing the 'flower blooming phenomenon, which blocks pipes, and using polymerization inhibitors can inhibit polymerization but may desorb and lose effectiveness over time.
Innovation Solution
A seal member with a resin portion containing a polymerization inhibitor, where the SP value difference between the resin and inhibitor is 16.37 or less, and the inhibitor's domain area is 25% or less with a short diameter of 5 μm or greater, ensuring efficient dispersion and long-term polymerization suppression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a PTFE base material with high solvent resistance is used, then permeation resistance is improved, but the gasket is still impregnated with monomer through gaps causing flower blooming phenomenon
Solution Approach 1:
The patent applies local quality by introducing polymerization inhibitor specifically into the gap regions of the PTFE gasket structure. The inhibitor is not uniformly distributed throughout the entire gasket but is concentrated in the microscopic gaps where monomer penetration occurs, providing localized protection against polymerization while maintaining the overall PTFE structure's solvent resistance and sealing properties.
Solution Approach 2:
The patent creates a composite material system by combining PTFE base material with polymerization inhibitor. The inhibitor particles are dispersed within the PTFE matrix and specifically accumulate in the gaps between PTFE particles, forming a composite structure that leverages both the solvent resistance of PTFE and the polymerization suppression capability of the inhibitor.
2Object-affected harmful factors
If a polymerization inhibitor is added to suppress polymerization, then flower blooming phenomenon is reduced, but the inhibitor desorbs and loses effectiveness over time
Solution Approach 1:
The patent utilizes the porous gap structure inherent in PTFE gaskets as a retention mechanism for the polymerization inhibitor. The inhibitor particles are sized and distributed to fit within the microscopic pores and gaps of the PTFE structure, physically trapping them in place. This porous retention mechanism prevents desorption and elution, maintaining inhibitor effectiveness over extended periods while allowing the inhibitor to remain accessible to monomers attempting to penetrate the gasket.
3Object-affected harmful factors
If polymerization inhibitor is dispersed in the resin, then polymerization suppression is improved, but large domains reduce suppression efficiency
Solution Approach 1:
The patent applies segmentation by dividing the polymerization inhibitor into numerous small discrete particles dispersed throughout the PTFE gasket matrix. Rather than having large continuous domains of inhibitor, the material is segmented into fine particles that distribute more uniformly within the resin structure. This segmentation increases the total surface area of inhibitor available for monomer interaction while reducing the formation of large ineffective domains.
Solution Approach 2:
The patent controls the physical parameters of inhibitor distribution, specifically targeting domain size and dispersion uniformity. By adjusting processing conditions and inhibitor particle size, the patent achieves a distribution where no single domain exceeds certain size thresholds, optimizing the inhibitor's ability to suppress polymerization throughout the gasket structure.
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 seal member effectively prevents the flower blooming phenomenon by maintaining polymerization inhibitor affinity and preventing desorption, ensuring long-term polymerization suppression without inhibiting the polymerization reaction.
Implementation Method 1
when an SP value [(J/cm3)0.5] of the resin is defined as SPb and an SP value [(J/cm3)0.5] of the polymerization inhibitor is defined as SPp, a relationship of Expression (1) is satisfied... a difference (SPp−SPb) between the SP value (SPp) of the polymerization inhibitor and the SP value (SPb) of the resin portion is 16.37 or less
Implementation Method 2
a proportion of the domain of the polymerization inhibitor with a short diameter of 5 μm or greater is 25% by area or less... preventing desorption
Data Source
AI summary
A seal member including a resin portion that contains a resin and a polymerization inhibitor, in which when an SP value [(J/cm3)0.5] of the resin is defined as SPb and an SP value [(J/cm3)0.5] of the polymerization inhibitor is defined as SPp, a relationship of Expression (1) is satisfied,SPp-SPb≤16.37Expression (1)when an area of the polymerization inhibitor in a cross section is set to 100% by area in observation of the cross section of the resin portion of the seal member, an area of the domain of the polymerization inhibitor with a short diameter of 5 μm or greater is 25% by area or less.