Surface modification of silicones
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Silicone elastomer surfaces tend to have high coefficients of friction, making them dusty and tacky, which is undesirable for applications like electronic device casings, and existing surface modification methods do not effectively reduce friction without altering the elastomeric properties.
Innovation Solution
Subjecting silicone elastomer-based articles to vacuum ultraviolet (VUV) radiation after curing and shaping to reduce the coefficient of friction by at least 5% without affecting the bulk properties of the silicone elastomer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If silicone elastomer is used for manufacturing articles, then the article has resilience and impact resistance, but the surface becomes tacky and picks up dust due to high coefficient of friction
Solution Approach 1:
The invention applies a hard coating layer specifically to the surface of the silicone elastomer article, creating a local quality difference between the soft resilient bulk material and the hard non-tacky surface layer. This resolves the contradiction by maintaining the resilience of the bulk while eliminating the tackiness of the surface.
Solution Approach 2:
The invention creates a composite structure combining silicone elastomer bulk material with a hard coating layer on the surface. This composite approach allows the article to simultaneously exhibit the impact resistance of the elastomer and the low-friction properties of the hard coating.
2Object-generated harmful factors
If a hard plastics coating is applied to silicone elastomer surface, then the surface becomes less tacky, but the overall article complexity increases
Solution Approach 1:
The invention replaces complex mechanical coating processes with a photochemical curing method using VUV radiation. The coating is applied as a liquid or paste and then cured in place through photopolymerization, eliminating the need for complex coating equipment and processes while achieving the desired hard surface.
Solution Approach 2:
The invention changes the chemical state of the coating material from uncured polymerizable composition to cured crosslinked network through VUV irradiation. This parameter change (from liquid to solid, from soft to hard) transforms the surface properties to reduce tackiness while simplifying the overall process.
3Object-generated harmful factors
If surface modification is applied to reduce friction, then the coefficient of friction decreases, but the elastomeric properties of the silicone surface are altered
Solution Approach 1:
The hard coating layer is applied only to the surface of the silicone elastomer, leaving the bulk material's elastomeric properties unchanged. This local modification approach reduces friction at the surface while preserving the resilience and flexibility of the underlying elastomer.
Solution Approach 2:
The article is segmented into two distinct functional layers: the bulk silicone elastomer providing mechanical properties and the surface hard coating providing low-friction properties. This segmentation allows each layer to independently fulfill its function without compromising the other.
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 VUV treatment significantly reduces the coefficient of friction and improves the surface feel by making the silicone surface less sticky, while maintaining the elastomeric properties and durability of the silicone elastomer.
Implementation Method 1
the coefficient of friction of the silicone surface is reduced by at least 5% by subjecting the article to vacuum ultraviolet (VUV) radiation
Data Source
AI summary
A process for modifying a silicone elastomeric-based surface of a textile article where the coefficient of friction (COF) of the silicone elastomeric-based surface is generally reduced by at least 5% is disclosed. The process comprises subjecting the silicone elastomeric-based surface of the textile article to vacuum ultraviolet (UV) radiation.