Coating composition and its uses
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Solution Overview
Problem
Conventional silicone-based synthetic leather coatings lack sufficient abrasion and scratch resistance, failing to meet the required standards of Wyzenbeek abrasion resistance and maintaining appearance under stretching without whitening.
Innovation Solution
A hydrosilylation curable silicone elastomer composition comprising polydiorganosiloxane polymers, finely divided silica as a reinforcing filler, silicone resin cross-linkers, a hydrosilylation catalyst, and an eco-diluent, which forms a topcoat that enhances abrasion and scratch resistance when cured.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional silicone-based synthetic leather coatings are used, then the material provides good flexibility and UV resistance, but the abrasion resistance and scratch resistance are insufficient
Solution Approach 1:
The patent applies composite materials by combining silicone elastomer with reinforcing fillers (such as silica), adhesion promoters, and cross-linking agents to create a multi-component coating system. This composite structure provides both the flexibility characteristic of silicone and the enhanced abrasion and scratch resistance required, resolving the contradiction between softness and durability.
Solution Approach 2:
The patent utilizes parameter changes through controlling the cross-linking density, filler content, and molecular weight of the silicone elastomer to optimize the balance between flexibility and mechanical strength. By adjusting these parameters, the coating achieves sufficient abrasion resistance while maintaining the scratch resistance needed for leather applications.
2Ease of operation
If the coating is made softer to maintain flexibility, then the material remains flexible, but the abrasion resistance decreases
Solution Approach 1:
The coating uses a composite formulation where soft silicone elastomer provides flexibility while dispersed reinforcing particles (fillers) and cross-linked network structures provide abrasion resistance. The synergistic combination allows the coating to be soft yet durable, resolving the contradiction between flexibility and abrasion resistance.
Solution Approach 2:
The patent applies local quality by creating regions of different properties within the coating: the silicone elastomer matrix provides flexibility and softness, while the filler particles and cross-linked domains provide localized strength and abrasion resistance. This spatial differentiation of properties allows the coating to exhibit both flexibility and durability simultaneously.
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 significantly improves abrasion resistance and scratch resistance, achieving Wyzenbeek abrasion resistance of greater than or equal to 75,000 times and maintaining the leather's appearance without whitening upon stretching.
Implementation Method 1
a hydrosilylation curable silicone elastomer composition containing Component (i), one or more polydiorganosiloxane polymer(s)... Component (iii) a silicone resin cross-linker having terminal (M) groups comprising silicone bonded hydrogen; Component (iv) a hydrosilylation catalyst
Data Source
AI summary
The present disclosure relates to a silicone elastomeric coating composition for synthetic leather, particularly silicone-based synthetic leather, a silicone elastomeric coating (e.g., a topcoat) formed as a reaction product of the cure of the coating composition, methods of making the topcoat and synthetic leather utilizing the same and uses of synthetic leather products. The topcoat is designed to provide synthetic leather with an improved abrasion and scratch resistant topcoat.