Synthetic Leather Coating Stack for Stain Resistance and Natural Texture
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Solution Overview
Problem
Current synthetic leathers face challenges in achieving both stain resistance and a natural leather-like texture and feel, as existing solutions either compromise on surface shininess or economic feasibility, and compatibility issues between polyurethane and silicone coatings affect adhesive strength and surface effects.
Innovation Solution
A stain-resistant synthetic leather is developed by sequentially forming a silane-based coating layer and a silicone coating layer on a polyurethane synthetic leather, enhancing binding strength and maintaining superior surface texture and flexibility, with the silane layer acting as a middle layer to improve compatibility between polyurethane and silicone layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a urethane or melamine-based anti-staining agent is coated on the polyurethane coating layer to improve stain resistance, then stain resistance is improved, but surface shininess increases causing an artificial plastic feeling
Solution Approach 1:
The patent introduces a silane-based coating layer as an intermediary between the polyurethane synthetic leather and the silicone coating layer. This intermediate layer enables compatible bonding between the polyurethane substrate and silicone coating, allowing the silicone to provide stain resistance without the need for traditional anti-staining agents that compromise surface texture. The silane layer acts as a bridge that maintains the natural leather-like feel while achieving the desired stain-resistant properties.
Solution Approach 2:
The patent creates a composite structure combining polyurethane synthetic leather, silane-based coating layer, and silicone coating layer. This composite material system leverages the advantages of each component: polyurethane provides the base fabric structure, silane provides bonding compatibility, and silicone provides stain resistance with a natural texture. The composite approach resolves the contradiction by distributing functions across multiple materials rather than relying on a single material to provide both stain resistance and natural texture.
2Shape
If a silicone coating layer is applied directly on polyurethane synthetic leather to achieve stain resistance and natural texture, then surface texture is improved, but adhesive strength between layers deteriorates due to incompatibility
Solution Approach 1:
The silane-based coating layer serves as a mediator that is chemically compatible with both polyurethane and silicone. It forms a bonding interface that allows the silicone coating layer to adhere properly to the polyurethane substrate. The silane layer contains functional groups that can bond with polyurethane on one side and silicone on the other, thereby resolving the incompatibility issue and ensuring strong adhesive strength between layers while maintaining the desired surface texture.
3Shape
If silicone alone is used for surface coating to achieve stain resistance and natural feel, then surface texture is improved, but manufacturing cost increases and processability becomes difficult
Solution Approach 1:
The patent divides the coating system into three separate functional layers: polyurethane synthetic leather (base layer), silane-based coating layer (intermediate bonding layer), and silicone coating layer (surface functional layer). This segmentation allows each layer to be optimized independently for its specific function. The silane layer is applied first to prepare the surface, followed by the silicone layer for stain resistance. This stepwise segmentation improves processability compared to using silicone alone, as each layer can be controlled and applied separately with appropriate parameters.
Solution Approach 2:
The patent modifies the coating system by introducing the silane-based coating layer with specific compositional parameters (containing C1-C10 modified alkylalkoxysilane) and controlled coating amount (20-30 g/m2). These parameter changes enable the system to achieve better processability and adhesion. The silane layer acts as a surface modifier that changes the chemical parameters of the polyurethane substrate, making it more compatible with subsequent silicone coating application and improving overall manufacturability.
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 solution provides excellent stain resistance, water resistance, and wear resistance while maintaining a smooth, flexible, and matte surface texture, effectively addressing the limitations of previous technologies by maximizing the advantages of both polyurethane and silicone coatings.
Implementation Method 1
the silane-based layer strengthens the binding between the polyurethane synthetic leather and the silicone coating layer
Data Source
AI summary
Provided a stain-resistant synthetic leather, including: (a) a polyurethane synthetic leather; (b) a silane-based coating layer formed on the polyurethane synthetic leather; and (c) a silicone coating layer formed on the silane-based coating layer, wherein the silane-based layer strengthens the binding between the polyurethane synthetic leather and the silicone coating layer, so that the stain-resistant synthetic leather can exhibit texture and flexibility of natural leather per se, and can exhibit excellent water resistance, stain resistance, weather resistance, and wear resistance through the silane-based coating layer and silicone coating layer formed on the polyurethane synthetic leather.