Coat-Forming Composition for Abrasion-Resistant Water Sliding
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional coat-forming compositions for metal surfaces struggle to maintain water sliding ability and durability after abrasion, and often experience component separation during preparation or storage.
Innovation Solution
A coat-forming composition comprising a mixture of hydrolyzable group-containing silicone oligomers and reactive silicone oils with specific functional groups, along with a hydrolysis catalyst and organic solvent, applied at specific mass ratios to form a durable and water-repellent coating film.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a moisture-curable polyorganosiloxane composition with volatile polyorganosiloxane oil is used, then water sliding characteristics are initially achieved, but the water sliding ability deteriorates over time due to volatilization and dissipation of the non-reactive polyorganosiloxane oil
Solution Approach 1:
The invention changes the chemical nature of the silicone oil from non-reactive (volatile) to reactive (non-volatile) by introducing functional groups that participate in crosslinking reactions. This transforms the oil's behavior from dissipating over time to forming permanent bonds in the coating matrix, thereby maintaining water sliding characteristics indefinitely.
Solution Approach 2:
The invention creates a composite system where reactive silicone oil with functional groups (mercapto, amino, or carbinol) is integrated into the moisture-curable polyorganosiloxane matrix. This composite approach combines the water sliding properties of silicone oil with the durability and crosslinking capability of reactive functional groups, achieving both initial performance and long-term stability.
2Reliability
If polydimethylsiloxane having silanol groups in both terminal groups is added to improve durability, then water sliding ability after abrasion is enhanced, but hydrophilicity becomes too large causing water sliding angle to become too small
Solution Approach 1:
The invention applies local quality by using silicone oils with functional groups at only one terminal rather than both terminals. This asymmetric functionalization provides sufficient crosslinking capability for durability while leaving the other terminal available to maintain hydrophobicity and appropriate water sliding characteristics, avoiding excessive hydrophilicity.
Solution Approach 2:
The invention changes the functional group configuration from symmetric (both terminals) to asymmetric (one terminal only), which modifies the balance between crosslinking density and surface hydrophobicity. This parameter change achieves the optimal balance between durability enhancement and maintenance of water sliding angle.
3Adaptability or versatility
If a coating composition with low compatibility of components is used, then formulation flexibility is increased, but separation or harmful effects occur during preparation or storage
Solution Approach 1:
The invention achieves homogeneity by selecting reactive silicone oils with functional groups that are chemically compatible with the moisture-curable polyorganosiloxane system. The reactive functional groups ensure uniform distribution and integration of the silicone oil into the coating matrix, preventing separation during preparation and storage while maintaining formulation flexibility.
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 achieves excellent water sliding ability and durability after abrasion, while preventing component separation, resulting in a stable and effective coating film for metal surfaces.
Implementation Method 1
a hydrolyzable group-containing silicone oligomer (A-1) having a kinematic viscosity at 25° C. of 10 mm2s−1 or less
Implementation Method 2
an organic solvent (C)
Data Source
AI summary
A coat-forming composition including (A) to (C) below, and containing 100 to 2000 parts by mass of (C) below relative to 100 parts by mass of (A) below: (A) a mixture of coating film-forming components containing (A-1) and (A-2) below at a mass ratio of (A-1):(A-2)=1:1.1 to 1:4.9, (A-1) a hydrolyzable group-containing silicone oligomer having a kinematic viscosity at 25° C. of 10 mm2s-1 or less, and (A-2) a reactive silicone oil having, at one terminal, a functional group from the group of a mercapto group, an amino group, and a monocarbinol group, provided that the reactive silicone oil having a monocarbinol group at one terminal has a functional group equivalent of 4500 g/mol or less; (B) a hydrolysis catalyst; and (C) an organic solvent. The coat-forming composition can form a coating film having both water sliding ability and durability (water sliding ability after abrasion).