Lightweight Composite Material with Segmented Fillers
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Solution Overview
Problem
Current composite materials lack high wear resistance, impact strength, and low density while also being prone to breakage, and they are not easily grindable or bondable after production.
Innovation Solution
A composite material comprising a binder and at least one filler fraction, with a first filler fraction having particulate polymeric fillers of low specific density (<1.5 g/cm³) and a second filler fraction of mineral fillers, allowing for high wear resistance, impact strength, and reduced risk of breakage, along with the ability to be sanded and bonded.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If coarser sand particles are used as fillers to achieve structural stability, then the composite material gains mechanical strength, but the surface becomes rough and abrasion resistance decreases
Solution Approach 1:
The filler is segmented into two distinct size fractions: a first fraction with particle diameters of 0.3-1.0 mm providing structural strength, and a second fraction with particle diameters of 0.05-0.2 mm filling the gaps between larger particles. This segmentation allows each fraction to perform its specific function optimally without compromising the other.
Solution Approach 2:
Different regions of the composite material have different filler concentrations tailored to local requirements: the first filler fraction dominates in providing overall structural strength, while the second filler fraction concentrates in surface regions and inter-particle spaces to smooth the surface and enhance abrasion resistance. This local optimization resolves the contradiction between strength and surface quality.
2Ease of manufacture
If ATH filler is used to enable post-processing with steel tools, then grindability improves, but mechanical stability against abrasion and scratch hardness decrease
Solution Approach 1:
The invention uses a composite filler system combining soft ATH particles (enabling post-processing) with hard mineral filler particles (providing abrasion resistance). The ATH fraction (60-65 wt%) ensures steel tool compatibility for grinding and sanding, while the mineral filler fraction (35-40 wt%, with Mohs hardness >6) compensates for the softness by providing a hard protective network that resists abrasion and scratching.
3Strength
If higher filling levels are used to improve mechanical properties, then strength increases, but density increases and impact strength decreases
Solution Approach 1:
The invention optimizes the filling level to a specific range of 73-77 wt%, balancing mechanical strength with acceptable density. Within this range, the dual-fraction filler system achieves effective packing that maximizes strength while limiting density increase. The specific particle size distribution enables this optimal filling level to be reached without excessive material concentration.
Data Source
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Figure 3
Figure 4a~4b
AI summary
Composite material comprising at least one binder and at least one filler fraction, wherein the composite material has a density of less than 2 g/cm3 and wherein at least one first filler fraction comprises particulate polymeric fillers.