Hot Melt Seal Composition for Repeated Opening Airtightness
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Solution Overview
Problem
Existing hot melt compositions used as seal materials fail to maintain excellent airtightness when repeatedly opened and closed, especially in high temperature environments, due to issues such as softening, peeling, cracking, and generation of voids during curing.
Innovation Solution
A hot melt composition incorporating a modified thermoplastic polymer with an alkoxysilyl group, a softener, and a catalyst, which undergoes crosslinking reactions upon exposure to moisture, forming a seal material that can maintain airtightness and flexibility even under repeated opening and closing conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional hot melt composition is used as seal material, then it can be applied easily by coating in molten state, but it fails to maintain airtightness when repeatedly opened and closed in high temperature environments
Solution Approach 1:
The patent changes the chemical parameters of the hot melt composition by incorporating specific polymer components with controlled molecular weights and compositions. The base polymer, modifier polymer, and crosslinking agent are selected and配比ed to achieve optimal balance between application properties (viscosity, wetting) and sealing performance (elasticity, heat resistance, airtightness maintenance under repeated opening/closing in high temperature environments)
Solution Approach 2:
The patent creates a composite material system consisting of multiple polymer components (base polymer, modifier polymer), softeners, and crosslinking agents. This composite structure combines the advantages of different materials: the base polymer provides fundamental sealing properties, the modifier polymer enhances elasticity and low-temperature flexibility, and the crosslinking agent forms a three-dimensional network structure that maintains airtightness under thermal and mechanical stress
2Strength
If the seal material is made rigid to maintain structural integrity, then it can resist deformation, but it loses flexibility needed to follow expansion, shrinkage, and warp of the member
Solution Approach 1:
The patent creates a dynamic seal material system that can adapt its properties to different conditions. The composition includes polymers with appropriate glass transition temperatures and molecular weights that allow the material to be flexible at service temperatures (following member expansion, shrinkage, and warp) while maintaining structural integrity. The crosslinking density is controlled to provide the right balance between rigidity and elasticity, enabling the seal to deform with the member and recover without permanent deformation
3Temperature
If the hot melt composition is highly crosslinked to improve heat resistance, then it can withstand high temperature, but it becomes brittle and prone to cracking
Solution Approach 1:
The patent carefully controls the crosslinking parameters by selecting appropriate crosslinking agents and controlling the crosslinking density. The base polymer and modifier polymer are chosen with molecular weights and compositions that, when crosslinked, provide heat resistance without excessive brittleness. The softener content and type are adjusted to maintain plasticity in the crosslinked structure, preventing crack formation while withstanding high temperature exposure
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 effectively forms a seal material that maintains excellent airtightness and flexibility, preventing damage and void formation, even in high temperature environments, and allows for easy reuse without compromising member integrity.
Implementation Method 1
a hot melt composition including a modified thermoplastic polymer having an alkoxysilyl group in a molecule, a softener, and a catalyst
Implementation Method 2
a modified thermoplastic polymer having an alkoxysilyl group in a molecule
Data Source
AI summary
One aspect of the present invention is a hot melt composition including a modified thermoplastic polymer having an alkoxysilyl group in a molecule; a softener; and a catalyst.