Cyclic Siloxane Coating Composition for Fluorine-Free Water Repellency
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Solution Overview
Problem
Traditional water-repellent fabrics rely on fluorochemicals, which are undesirable in some applications, prompting the need for fluorine-free alternatives with effective water-repellent properties.
Innovation Solution
Cyclic siloxane compounds with specific structures are applied to fibrous substrates to create hydrophobic layers, offering superior water-repellent properties without using fluorine, achieved through their unique co-crystallization of hydrocarbon chains.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fluorochemicals are used to create water-repellent fabrics, then water-repellent properties are achieved, but environmental and health concerns arise making them undesirable
Solution Approach 1:
The invention changes the chemical composition parameters by replacing fluorine-containing compounds with cyclic siloxane compounds that have specific molecular structures (Formula I and II), thereby maintaining water-repellent functionality while eliminating harmful fluorine content
Solution Approach 2:
The invention uses composite material structures where cyclic siloxane molecules form organized assemblies with hydrocarbon chains that co-crystallize, creating a composite material system that achieves superior water repellency without fluorine
2Object-affected harmful factors
If traditional hydrocarbon compounds are used for water repellency, then fluorine-free treatment is achieved, but water-repellent properties are insufficient
Solution Approach 1:
The invention creates a composite material system where cyclic siloxane backbone structures combine with organized hydrocarbon chains that co-crystallize, forming a composite structure that achieves superior water repellency compared to simple hydrocarbon compounds
Solution Approach 2:
The invention applies local quality enhancement by creating specific organized structures of hydrocarbon chains attached to cyclic siloxane backbones, where the local arrangement and co-crystallization of chains provide enhanced water-repellent properties at the molecular level
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 cyclic siloxane compounds demonstrate excellent water-repellent properties, as evidenced by higher contact angles compared to traditional hydrocarbon compounds, making them suitable for fluorine-free treatments that enhance substrate water repellency.
Implementation Method 1
achieved through their unique co-crystallization of hydrocarbon chains
Implementation Method 2
a layer on which a water droplet has a contact angle of at least 90 degrees
Data Source
AI summary
A cyclic siloxane compound, composition, method, and an article including the siloxane, wherein the cyclic siloxane has the following Formula (I): wherein: each R1 and R2 is independently a (C1-C4)alkyl; each L1 and L2 is independently a single bond, an alkylene, or an alkylene bonded to a group selected from oxy, thio, carbonyl, -NH-, and combinations thereof; each R3 is independently a linear (C14-C100)alkyl; each R4 is independently a (C1-C30)alkyl, a (C2-C30)heteroalkyl having at least one oxygen, sulfur, or -NH- group, or a (C1-C30)alkyl substituted with a fluoro, thiol, isocyanato, cyanato, hydroxyl, glycidoxy, or epoxy group; with the proviso that L1, L2, and R4 are selected such that each Si atom is directly bonded to an alkylene or an alkyl; m is an integer of at least 2; n is an integer of 0 or above; m + n is an integer of at least 3; and the cyclic siloxane compound is a solid at 25°C.