Conductive Thermoplastic Composite for Electrostatic Painting

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Solution Overview

Problem

The automotive industry faces challenges in implementing lightweight and conductive composite materials in motor vehicles to meet emissions and fuel consumption standards while reducing paint waste and emissions from the painting process, as existing materials are either too dense or require additional conductive layers for electrostatic painting.

Innovation Solution

An injection moldable composite material comprising a polymer matrix, glass microspheres, a conductive network of linked nanostructures, and additives such as magnesium sulfate fibers and wollastonite, which includes a polymer adhesive to adhere the conductive network, enabling efficient electrostatic painting without talc, and using recycled materials to enhance properties like impact strength and conductivity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Weight of moving object

If lightweight composite materials are used to reduce vehicle weight, then fuel consumption and emissions are reduced, but the materials lack electrical conductivity required for electrostatic painting

Engineering Contradiction:

Improvevehicle weightVSAvoidelectrical conductivity

Core Design Contradiction:

Weight of moving objectVSReliability

Solution Approach 1:

The patent uses a composite material system combining polypropylene polymer matrix with glass microspheres for lightweighting, and integrates conductive carbon nanotube networks to provide electrical conductivity. This multi-component composite approach simultaneously achieves weight reduction and conductivity requirements for electrostatic painting applications.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The conductive carbon nanotube network is distributed throughout the polymer matrix to create localized conductive pathways. This allows the bulk material to remain lightweight and non-conductive where needed, while providing sufficient conductivity at the surface and throughout the structure where electrostatic painting requires charge dissipation.

Inventive Principle:

Principle #3Local quality

2Loss of substance

If traditional painting processes are used, then all surfaces can be painted, but paint waste and emissions increase significantly

Engineering Contradiction:

Improvepaint wasteVSAvoidpainting process complexity

Core Design Contradiction:

Loss of substanceVSEase of manufacture

Solution Approach 1:

The composite material itself provides the electrical conductivity needed for electrostatic painting, eliminating the need for separate conductive primer layers or additional coating steps. The material serves its own electrical function, enabling direct electrostatic painting application.

Inventive Principle:

Principle #25Self-service

3Productivity

If conductive layers are added to enable electrostatic painting, then paint efficiency improves, but material complexity and cost increase

Engineering Contradiction:

Improvepaint transfer efficiencyVSAvoidmaterial structure complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent merges the structural polymer matrix, lightweight glass microsphere filler, and conductive carbon nanotube network into a single integrated composite material. This combination provides both mechanical structure and electrical conductivity simultaneously, eliminating the need for separate conductive layers.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The composite material performs multiple functions: the polypropylene matrix provides structural integrity, glass microspheres reduce weight, and carbon nanotubes provide electrical conductivity. This multi-functional material eliminates the need for additional specialized layers for electrostatic painting.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 composite material achieves reduced weight, improved conductivity for efficient paint transfer, and enhanced mechanical properties like tensile strength and impact resistance, while eliminating the need for talc and reducing paint waste and emissions.

Implementation Method 1

The plurality of additives includes a polymer adhesive configured to adhere the conductive network of linked nanostructures to the polymer matrix

Methodology Applied

Scientific EffectAdhesion: Adhesive

Implementation Method 2

electrostatic painting requires the substrate be electrically conductive... improved conductivity for efficient paint transfer

Methodology Applied

Scientific EffectElectrostatic deposition: Electrostatic Deposition

Data Source

PatentUS20240017453A1Ultra-low density conductive thermoplastic composite material for painted components

Publication Date: 2024.01.18 FORD GLOBAL TECH LLC

AI summary

An injection moldable composite material includes a polymer matrix, glass microspheres, a conductive network of linked nanostructures, and a plurality of additives. The polymer matrix includes a polypropylene impact copolymer. The plurality of additives includes a polymer adhesive configured to adhere the conductive network of linked nanostructures to the polymer matrix.