Silane Surface-Treating Composition for Friction-Durable Oil Repellency
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Solution Overview
Problem
Existing silane compounds do not provide sufficient friction durability in surface-treating layers.
Innovation Solution
A silane compound with specific terminal groups and a Si atom bonded to a hydroxyl or hydrolyzable group, represented by formulas (1) to (3), forming a surface-treating layer with improved oil-repellency and friction durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional silane compounds are used for surface treatment, then water- and oil-repellency is achieved, but friction durability is insufficient
Solution Approach 1:
The invention changes the chemical structure parameters of silane compounds by introducing specific terminal groups (formula 1) with nitrogen-containing functional groups and controlled hydrophobic chain lengths, and combining them with silane compounds having hydroxyl or hydrolyzable groups (formula 3). This structural parameter modification enables the formation of crosslinked surface-treating layers with enhanced friction durability while maintaining water- and oil-repellency.
Solution Approach 2:
The invention creates a composite surface-treating layer by combining two distinct silane compound types: those with terminal groups containing nitrogen-containing functional groups and hydrophobic groups (formula 1), and those with hydroxyl or hydrolyzable groups (formula 3). This composite approach leverages the complementary properties of both compound types to achieve both repellency and durability.
2Duration of action of stationary object
If existing silane compounds form surface-treating layers, then basic repellency is provided, but friction durability remains low
Solution Approach 1:
The invention performs preliminary chemical bonding by using silane compounds with hydroxyl or hydrolyzable groups that can form strong covalent bonds with hydroxyl groups on the substrate surface before applying the coating. This preliminary bonding action creates a robust anchor for the surface-treating layer, significantly improving friction durability and wear resistance from the outset.
Solution Approach 2:
The invention replaces mechanical adhesion with chemical adhesion by utilizing silane compounds that form covalent bonds with the substrate. This substitution of bonding mechanism from purely mechanical interlocking to chemical bonding significantly enhances the durability and wear resistance of the surface-treating layer.
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 silane compound forms a surface-treating layer with enhanced oil-repellency and friction durability, addressing the limitations of existing compounds.
Implementation Method 1
A silane compound with specific terminal groups and a Si atom bonded to a hydroxyl or hydrolyzable group
Implementation Method 2
The silane compound forms a surface-treating layer
Data Source
AI summary
A silane compound comprising: the following group A or group B at a terminal: R1naR23-naSi-(O)z- (A) wherein R1 is each independently a group represented by -(R4-SiR32)ma-R3, R4 is each independently an oxygen atom or a C1-6 alkylene group, R3 is each independently a hydrocarbon group or R1', R1' has the same meaning as R1, ma is each independently an integer of 1 to 5, provided that the number of R1' in R1 is 20 or less, R2 is each independently a hydrocarbon group, na is an integer of 1 to 3, z is 0 or 1; and a Si atom to which a hydroxyl group or a hydrolyzable group is bonded, at another terminal.