Terminal-Group Silane Coating for Oil Repellency and Friction Durability
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Solution Overview
Problem
Existing silane compounds do not provide sufficient oil-repellency and friction durability in surface treatments.
Innovation Solution
A silane compound with a specific terminal group structure, including a hydrocarbon group or derivative, and a Si atom bonded to a hydroxyl or hydrolyzable group, which forms a surface-treating layer with enhanced oil-repellency and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If existing silane compounds are used for surface treatment, then water-repellency is achieved, but oil-repellency and friction durability are insufficient
Solution Approach 1:
The patent modifies the molecular structure parameters of silane compounds by introducing specific terminal groups (fluorinated groups, long-chain hydrocarbon groups, or siloxane groups) and controlling the silicon-to-carbon ratio. These parameter changes enable the compound to simultaneously achieve high oil-repellency and friction durability that existing compounds cannot provide
Solution Approach 2:
The invention creates a composite surface layer by combining multiple functional groups within the silane compound molecule itself - hydrolyzable groups for substrate bonding, oil-repellent terminal groups (fluorinated, hydrocarbon, or siloxane), and specific structural ratios. This molecular-level composite structure provides both oil-repellency and friction durability in a single material system
2Object-affected harmful factors
If conventional silane compounds are applied, then surface treatment is achieved, but the oil-repellency performance is insufficient
Solution Approach 1:
The patent applies local quality by concentrating oil-repellent functional groups specifically at the terminal positions of the silane compound molecules, while maintaining a relatively simple backbone structure. The terminal groups (fluorinated, long-chain hydrocarbon, or siloxane) provide localized high oil-repellency without requiring complexity throughout the entire molecular structure
Solution Approach 2:
The invention achieves enhanced oil-repellency through controlled parameter changes - specifically the silicon-to-carbon ratio (1:3 to 1:10) and the presence of specific terminal groups. These parameter adjustments provide high oil-repellency performance without requiring overly complex molecular architectures
3Reliability
If existing surface treatment compounds are used, then basic protection is provided, but friction durability is insufficient
Solution Approach 1:
The patent incorporates hydrolyzable groups (such as alkoxy groups) directly into the silane compound structure in advance, enabling the compound to self-bond to the substrate through hydrolysis and condensation reactions. This preliminary incorporation of bonding functionality eliminates the need for separate surface preparation or additional bonding steps, improving friction durability while maintaining ease of manufacture
Solution Approach 2:
The invention optimizes the molecular weight and structural parameters of the silane compound to achieve an balance between durability and manufacturability. By controlling the chain length of hydrocarbon groups (C8-C20) and the silicon-to-carbon ratio, the compound achieves high friction durability through a single application without requiring complex multi-step synthesis or processing procedures
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 layer with higher oil-repellency and improved friction durability, addressing the limitations of existing compounds.
Implementation Method 1
a Si atom to which a hydroxyl group or a hydrolyzable group is bonded, at another terminal
Data Source
AI summary
A silane compound including the following group A at a terminal:where 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.