Keratin-Fiber Casting Compound for Impact-Resistant Molded Parts
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Solution Overview
Problem
Curable casting compounds used in the kitchen and sanitary sector face challenges with high brittleness due to the necessary high filler content, resulting in inadequate impact and shock resistance in plastic molded parts like kitchen sinks.
Innovation Solution
Incorporating keratin fibers into the casting compound, which significantly increases impact resistance without the need for surface coating and ensures uniform distribution, unlike glass fibers, and using a preferred weight percentage of 0.15 to 0.35% by weight for optimal results.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a high proportion of inorganic filler is used in the casting compound, then the temperature resistance and scratch resistance of the surface are improved, but the impact resistance deteriorates due to material brittleness
Solution Approach 1:
The patent applies composite materials by combining inorganic filler particles with keratin fibers in a polymer matrix. The keratin fibers serve as a reinforcing phase that complements the inorganic filler, creating a multi-phase composite structure where the fibrous element provides toughness and impact resistance while the inorganic filler maintains temperature and scratch resistance. This composite approach resolves the contradiction by integrating two different reinforcement mechanisms within the same material system.
2Strength
If glass fibres are added to increase impact resistance, then the reinforcing effect is achieved, but surface treatment is required and fibre distribution becomes non-homogeneous
Solution Approach 1:
The keratin fibers exhibit self-service characteristics by naturally possessing surface properties that enable direct bonding with the polymer matrix without requiring external surface treatments. The fibers' inherent characteristics allow them to self-integrate into the casting compound, achieving both reinforcement and homogeneous distribution without additional processing steps. This eliminates the need for silanisation or other surface modifications required for glass fibers.
Solution Approach 2:
The patent changes the material parameter from inorganic glass fibers to organic keratin fibers, fundamentally altering the surface chemistry and bonding characteristics. This parameter change transforms the interaction between reinforcement and matrix, enabling direct adhesion without surface treatment and improving distribution homogeneity through different rheological and settling behaviors during curing.
3Strength
If the proportion of keratin fibres is increased above 0.5% by weight, then the impact resistance is further improved, but fibre clustering occurs reducing uniformity
Solution Approach 1:
The patent applies partial action by using a moderate concentration of keratin fibers (0.1-0.5% by weight) rather than excessive amounts. This partial reinforcement level is sufficient to achieve the desired impact resistance improvement while avoiding the negative effects of fiber clustering and aggregation that occur at higher concentrations. The optimized dosage ensures adequate reinforcement without compromising composition uniformity.
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 addition of keratin fibers enhances the impact resistance of plastic molded parts from less than 2.0 mJ/mm² to over 2.6 mJ/mm², effectively addressing the brittleness issue and providing improved resistance to impact and shock loads.
Implementation Method 1
a special surface coating of the fibres is not necessary in order to ensure an adequate adhesion between the fibres and the polymer matrix
Implementation Method 2
a binder component based on a polymerisable monomer
Data Source
AI summary
In order to provide a curable casting compound for producing plastic molded parts, comprising a binder component based on polymerizable monomers selected from methyl acrylate or methyl methacrylate and a proportion of about 40 to about 85% by weight of one or more inorganic fillers, which compound can be used for producing plastic molded parts having an increased impact strength, it is proposed that the casting compound comprise 0.1 to 0.5% by weight of keratin fibers.