Curable Composition Low-Temperature Flexibility
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Solution Overview
Problem
Existing curable compositions based on fluoro(poly)ether compounds are unsuitable for use at low temperatures due to increased elastic modulus, making them inadequate for applications requiring flexibility at sub-zero conditions.
Innovation Solution
A curable composition comprising a perfluoro(poly)ether group-containing silane compound with specific structural features, including a perfluoro(poly)ether group and an organosilicon compound, which maintains low elastic modulus even at low temperatures, allowing for the formation of a cured product suitable for use at temperatures as low as -50°C.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional fluoro(poly)ether-based composition is used, then water-repellency and oil-repellency are achieved, but elastic modulus increases at low temperature making it unsuitable for cold conditions
Solution Approach 1:
The invention changes the chemical structure parameters of the fluoro(poly)ether group by introducing specific repeating units with different chain lengths (C3, C4, C5, C6) and controlling their ratios. This structural parameter modification allows the composition to maintain low elastic modulus at low temperatures while preserving water and oil repellency properties.
Solution Approach 2:
The invention creates a composite molecular structure by combining multiple types of fluoro(poly)ether repeating units in specific ratios. This composite approach within the molecular structure enables the material to exhibit both low-temperature flexibility and hydrophobic/lipophobic properties simultaneously.
2Reliability
If conventional perfluoro(poly)ether structure is used, then chemical resistance and weather resistance are improved, but the cured product becomes too rigid at low temperature
Solution Approach 1:
The invention modifies the molecular parameters by incorporating shorter chain repeating units (C3 and C4) alongside longer chain units. This parameter adjustment reduces the overall rigidity of the polymer chain while maintaining the chemical resistance provided by the perfluoro structure, enabling flexibility at low temperatures.
Solution Approach 2:
The invention applies local structural variation within the polymer chain by distributing different repeating unit types (C3, C4, C5, C6) throughout the structure. This local diversity in chain length creates segments with different flexibility characteristics, allowing the material to maintain both durability and flexibility at low temperatures.
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 a cured product with a low elastic modulus ratio at -50°C compared to 0°C, maintaining rubber-like properties and flexibility even at low temperatures, making it suitable for use in cold conditions.
Implementation Method 1
a perfluoro(poly)ether group-containing silane compound which is a compound having two or more Si atoms each bonding to at least one group selected from the group consisting of a hydroxyl group and a hydrolyzable group
Data Source
AI summary
A curable composition including a perfluoro(poly)ether group-containing silane compound which is a compound having two or more Si atoms each bonding to at least one group selected from the group consisting of a hydroxyl group and a hydrolyzable group, and a perfluoro(poly)ether group, wherein the perfluoro(poly)ether group is a group represented by formula: - (OC6F12)a-(OC5F10)b-(OC4F8)c-(OC3X106)d-(OC2F4)e-(OCF2)f-, wherein a, b, c and d are each independently an integer of 0 or more and 30 or less, e and f are each independently an integer of 1 or more and 200 or less, the sum of a, b, c, d, e and f is at least 5 or more, the occurrence order of the respective repeating units in parentheses with the subscript a, b, c, d, e or f is not limited in the formula, a ratio of e to f is less than 1.0, and each X10, at each occurrence, is independently a hydrogen atom, a fluorine atom or a chlorine atom; an organosilicon compound having at least two -O-Rg3(s) each bonding to a Si atom, wherein each Rg3, at each occurrence, is independently a hydrogen atom or a monovalent organic group; and a catalyst.