Silicon-Containing Polymer Coating Adhesion
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Solution Overview
Problem
Silica-based coatings used in various applications tend to peel off from substrates during the baking process, leading to adhesive issues and instability of the coated films.
Innovation Solution
A silicon-containing polymer with a molecular chain incorporating poly- or oligo-siloxane and poly- or oligo-silane chains, featuring groups that can undergo a condensation reaction, such as an ene-thiol reaction, to enhance adhesion to substrates and prevent peeling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a liquid composition containing siloxane resin, silica, and organic solvent is used to form a coated film, then the coating can be formed on substrates, but the coated film peels off during transfer to the baking furnace
Solution Approach 1:
The patent modifies the chemical composition of the coating by introducing groups with silyl and sulfide functionalities that can undergo condensation reactions. This changes the chemical parameters of the polymer structure to enable covalent bonding with the substrate, transforming the coating from a physically adhered layer to a chemically bonded layer that resists peeling during transfer and baking processes.
Solution Approach 2:
The invention creates a composite polymer structure combining siloxane chains, silane chains, and sulfur-containing functional groups. This multi-component composite material integrates the benefits of each component: siloxane for backbone stability, silane for crosslinking capability, and sulfide groups for condensation reactions with substrate hydroxyl groups, achieving superior adhesion that prevents peeling.
2Strength
If conventional siloxane resin composition is used, then the coating can be applied to substrates, but the adhesive strength is insufficient and the film is easily peeled off
Solution Approach 1:
The patent fundamentally changes the chemical reactivity parameters of the coating material by incorporating ene-thiol reactive groups. These groups undergo condensation reactions with hydroxyl groups on the substrate surface, creating strong covalent bonds. This parameter change transforms the adhesion mechanism from weak physical adsorption to strong chemical bonding, simultaneously improving both adhesive strength and film stability.
Solution Approach 2:
The sulfur-containing functional groups act as chemical intermediaries that bridge the coating material and the substrate. The sulfide groups in the polymer chain mediate the bonding between the organic siloxane/silane backbone and the inorganic substrate surface, forming a stable interface that prevents peeling and enhances both adhesive strength and film stability during processing.
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 silicon-containing polymer forms a coated film with improved adhesive properties, preventing peeling and allowing for the formation of stable silica-based coatings with good conformal properties on substrates, even on uneven surfaces.
Implementation Method 1
introducing a group having a silyl group and a sulfide group, which can be subjected to a condensation reaction
Implementation Method 2
by an ene-thiol reaction
Implementation Method 3
a step of drying the coated film
Implementation Method 4
forming a coated film by applying the film-forming composition on a substrate
Data Source
AI summary
A silicon-containing polymer which results in a composition that forms a coated film having good adhesive properties to a substrate and does not easily peel off the substrate, a film-forming composition including the polymer, a method for forming a silicon-containing polymer coating using the composition, a method for forming a silica-based coating using the composition, and a production method for the polymer. In a silicon-containing polymer including at least one of poly- or oligo-siloxane chain and poly- or oligo-silane chain in a molecular chain, a group having a silyl group and a sulfide group, which can be subjected to a condensation reaction, is introduced into the molecular chain, for example, by an ene-thiol reaction.