Cyanoacrylate Wire Sealing Composition for Heat and Flex Resistance
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Solution Overview
Problem
Existing compositions for sealing coated electric wires fail to provide adequate heat resistance, moisture resistance, thermal shock resistance, and flex resistance, leading to potential fractures and malfunctions in electrical systems.
Innovation Solution
A composition comprising a 2-cyanoacrylate compound with more than 50% to 99% of a 2-cyanoacrylate having an ether bond and 1% to 50% of alkyl 2-cyanoacrylate, along with a (meth)acrylate having two or more (meth)acryloyloxy groups, a polymerization initiator, and a curing accelerator, which forms a cured product with excellent heat resistance, moisture heat resistance, and thermal shock resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional composition for sealing coated electric wire is used, then the gap between the conducting wire and coating is filled to enhance airtightness, but the cured product lacks sufficient heat resistance, moisture heat resistance, thermal shock resistance, and flex resistance
Solution Approach 1:
The patent changes the chemical composition parameters of the sealing material by specifying precise ratios of 2-cyanoacrylate compounds with different alkyl groups (methyl, ethyl, propyl, butyl, pentyl, hexyl, heptyl, octyl, nonyl, decyl, or higher). This compositional parameter optimization enables the cured product to simultaneously achieve excellent sealing performance, heat resistance, moisture heat resistance, thermal shock resistance, and flex resistance without the trade-offs of conventional compositions
Solution Approach 2:
The patent creates a composite sealing composition by combining multiple 2-cyanoacrylate compounds with different molecular structures and properties. The synergistic effect of these composite cyanoacrylate components produces a cured product with superior comprehensive performance including heat resistance, moisture resistance, thermal shock resistance, and flex resistance, resolving the contradiction between sealing effectiveness and environmental resistance
2Temperature
If the sealing composition provides high heat resistance and thermal shock resistance, then the cured product becomes rigid, but flex resistance deteriorates causing fractures when the wire is bent
Solution Approach 1:
The patent optimizes the chemical composition parameters by selecting specific ratios of cyanoacrylate compounds with different chain lengths and structures. This parameter optimization creates a cured product with balanced mechanical properties that maintains both thermal shock resistance and flex resistance, preventing fractures during bending while withstanding thermal cycling
Solution Approach 2:
The patent employs a composite formulation of multiple 2-cyanoacrylate compounds that work synergistically to achieve both rigidity for thermal resistance and flexibility for bend resistance. The diverse molecular structures in the composite composition provide a network that resists thermal degradation while maintaining elastic recovery for flex resistance
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 ensures no fractures or cracks in coated electric wires under stress, maintaining resistance to heat, moisture, and thermal shocks, while providing flexibility, as demonstrated by storage modulus within specific ranges and successful sealing tests.
Implementation Method 1
a composition for sealing a coated electric wire, containing a cyanoacrylate compound
Implementation Method 2
a 2-cyanoacrylate having an ether bond in an ester residue thereof
Data Source
AI summary
There are provided a composition for sealing a coated electric wire, containing a 2-cyanoacrylate compound, which gives a cured product not only excellent in heat resistance, moisture heat resistance, and thermal shock resistance but also excellent in flex resistance, wherein the 2-cyanoacrylate compound contains more than 50 mass % to not more than 99 mass % of a 2-cyanoacrylate having an ether bond in an ester residue, and not less than 1 mass % to less than 50 mass % of at least one alkyl 2-cyanoacrylate selected from a group consisting of isopropyl cyanoacrylate and n-butyl cyanoacrylate, relative to 100 mass % of the total of the 2-cyanoacrylate compound; and further a coated electric wire covered by the composition.