Conductive Thermoplastic Polyurethane for Low Humidity Antistatic Performance
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Solution Overview
Problem
Polymers exhibit low electrical conductivity, leading to electrostatic charging issues such as accelerated soiling, adhesion problems, and safety hazards like sparking, especially in electronic components and explosive environments, with existing additives being ineffective at low humidity, incompatible with substrates, or altering mechanical properties.
Innovation Solution
A composition comprising thermoplastic polyurethane (TPU) prepared from a diisocyanate, a polyol with ethoxy and propoxy groups, and a chain extender, optionally with a salt and/or ionic liquid, which forms a conductive network to enhance volume conductivity in both polar and nonpolar polymers without significant optical or mechanical impairment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional antistatic additives are used to improve surface conductivity, then electrostatic charging is reduced, but effectiveness is lost at low atmospheric humidity
Solution Approach 1:
The invention changes the mechanism of conductivity improvement from surface-based (humidity-dependent) to volume-based (humidity-independent) by incorporating conductive particles throughout the polymer matrix, enabling consistent antistatic performance across varying humidity conditions
Solution Approach 2:
The invention creates a composite material system by combining polymer基材 with conductive particles (carbon black, metal powder, or conductive polymers) to achieve volume conductivity, transforming the single-material structure into a multi-component composite that provides both mechanical properties and electrical conductivity
2Reliability
If carbon black or metal powder is used to increase volume conductivity, then antistatic property is improved, but mechanical properties are deteriorated
Solution Approach 1:
The invention optimizes the concentration and distribution parameters of conductive particles within the polymer matrix, using sufficient amounts to achieve volume conductivity while controlling particle aggregation to maintain mechanical integrity
Solution Approach 2:
The invention develops optimized composite formulations that balance the ratio of conductive additives to polymer基材, creating a composite structure where conductive particles are dispersed throughout the matrix to provide electrical pathways without compromising the mechanical strength and flexibility of the polymer
3Reliability
If carbon black or metal powder is used for conductivity improvement, then volume conductivity is increased, but optical transparency is lost
Solution Approach 1:
The invention changes the physical and chemical parameters of conductive additives by selecting alternative materials such as conductive polymers or using ultra-fine particle sizes and optimized dispersants, allowing light to pass through while maintaining electrical conductivity pathways
Solution Approach 2:
The invention creates transparent composite materials by combining transparent or translucent polymer基材 with conductive polymers or ultra-fine conductive particles that form conductive networks at the molecular level, achieving volume conductivity without blocking light transmission
4Stability of the object's composition
If high molecular weight antistatics are used to improve compatibility, then substrate compatibility is enhanced, but conductivity is reduced due to lower mobility
Solution Approach 1:
The invention uses a composite approach by combining high molecular weight polymer carriers (for compatibility and stability) with conductive particles or conductive polymer segments (for conductivity), creating a multi-component system where each component fulfills its functional role without compromising the other
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 TPU composition effectively reduces electrostatic charging across a wide range of polymers, maintaining conductivity at low humidity and ensuring compatibility and minimal impact on mechanical properties, allowing for the use in transparent and nonpolar materials.
Implementation Method 1
the improved conductivity is present not only on the surface but in the entire polymer
Implementation Method 2
a salt and/or an ionic liquid, preferably an ionic liquid, is comprised in the composition and the polyol A comprises ethoxy and propoxy groups and the polyol B comprises butoxy groups
Data Source
AI summary
The invention relates to a composition comprising a thermoplastic polyurethane, where the thermoplastic polyurethane has been prepared from a) a diisocyanate, b) a polyol comprising a polyol A and a polyol B and c) a chain extender, optionally with the aid of catalysts and optionally further comprising additives and/or auxiliaries, and a salt and/or an ionic liquid, preferably an ionic liquid, is comprised in the composition and the polyol A comprises ethoxy and propoxy groups and the polyol B comprises butoxy groups.