Hard-Particle Coating for Lightweight Scratch-Resistant Composites
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Solution Overview
Problem
Existing composite materials for surfaces like countertops and furniture are heavy, expensive, and prone to damage, limiting their use in large applications and requiring complex on-site processing, while those with lower density are susceptible to scratches and cracks.
Innovation Solution
A composite material with a base material and a coating layer, where the coating layer contains a second binder and particulate filler fraction with mineral hardness ≥6, applied in a way that enriches the surface with hard particles, providing a durable and scratch-resistant finish that can be post-processed with conventional tools.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If composite materials are made with high mineral filler content (60-80 wt.%) to achieve high strength and durability, then the material density increases significantly, making the materials too heavy for large dimensions and complex processing
Solution Approach 1:
The composite material is divided into two distinct layers: a base material layer containing 60-80 wt.% mineral filler for high strength, and a coating layer with lower filler content (20-40 wt.%) for reduced weight and improved processability. This segmentation allows each layer to optimize its properties independently, resolving the contradiction between strength and weight.
Solution Approach 2:
Different regions of the composite material are assigned different filler concentrations tailored to their functional requirements. The base material layer uses high mineral filler content for structural strength, while the coating layer uses lower filler content for weight reduction and ease of on-site processing, allowing local optimization of the density-strength trade-off.
2Strength
If composite materials are made with high mineral filler content to achieve high strength, then the material becomes difficult to process on site with conventional tools, requiring complex pre-processing and logistics
Solution Approach 1:
The material is segmented into a hard base layer for structural integrity and a softer coating layer for ease of processing. The coating layer's lower mineral filler content (20-40 wt.%) makes it amenable to conventional on-site tools, while the base layer maintains the required load-bearing capacity, resolving the contradiction between strength and processability.
Solution Approach 2:
The coating layer is specifically designed with lower filler content and different composition to be more workable with conventional tools, while the base material maintains high strength. This local differentiation of material properties allows the overall composite to achieve both high strength and ease of on-site processing.
3Ease of manufacture
If the surface layer is made with pure resin to enable easy processing, then the surface becomes susceptible to scratches and cracks, reducing durability
Solution Approach 1:
The coating layer is designed with a specific balance of resin and mineral filler (20-40 wt.% filler) that provides both processability and durability. Unlike pure resin surfaces that are soft and susceptible to damage, this optimized composition maintains adequate hardness and scratch resistance while remaining workable with conventional tools, resolving the contradiction between processability and reliability.
Data Source
AI summary
The invention is directed to composite material comprising a base material comprising at least one first binder and at least one particulate first filler fraction based on inorganic or organic, natural or synthetic material, and a coating layer which at least partially covers the base material, wherein the coating layer comprises at least one second binder and at least one particulate second filler fraction of a particularized mean size, wherein the second filler fraction comprises particles having a particularized mineral hardness, wherein the second filler fraction comprises particles selected from a group comprising a wide variety of materials and/or mixtures thereof. The invention further relates to a method for producing a composite material and a construction element comprising such a composite material.