Modified Toner-Based Asphalt Additive for Temperature Performance

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Solution Overview

Problem

Unprocessed waste toner as an asphalt additive improves high-temperature performance but degrades low-temperature performance, making asphalt more susceptible to cracking due to increased stiffness, and poses handling challenges due to its fine powder form.

Innovation Solution

A modified toner-based additive is created by mixing waste toner with gelling clay, reactive agents, elastomers, functional fillers, and compatibilizers, undergoing frictional heating and sintering to form granules with consistent size and shape, balancing plastomeric and elastomeric properties for improved high and low-temperature performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Temperature

If unprocessed waste toner is added to asphalt to improve high-temperature performance, then the stiffness and high-temperature resistance are improved, but the low-temperature performance deteriorates and cracking susceptibility increases

Engineering Contradiction:

Improvehigh-temperature performanceVSAvoidlow-temperature performance

Core Design Contradiction:

TemperatureVSReliability

Solution Approach 1:

The patent applies parameter changes by modifying the physical and chemical properties of toner particles through controlled frictional heating, shear, sintering, coalescence, and fusion processes. These parameter changes transform the toner from a fine powder into granules with specific size ranges (0.1-2.0 mm), moisture content (2-15%), and chemical composition that balance both high-temperature stiffness and low-temperature flexibility requirements

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite material by combining waste toner with gelling clay, reactive agents, elastomers, functional fillers, and compatibilizers. This composite structure allows the additive to provide both plastomeric properties (for high-temperature stiffness) and elastomeric properties (for low-temperature flexibility), resolving the contradiction between high and low-temperature performance

Inventive Principle:

Principle #40Composite materials

2Stability of the object's composition

If unprocessed waste toner is used as an asphalt additive, then plastomeric properties are improved, but handling difficulties and OH&S issues arise due to fine powder form

Engineering Contradiction:

Improveplastomeric propertiesVSAvoidhandling properties

Core Design Contradiction:

Stability of the object's compositionVSEase of operation

Solution Approach 1:

The patent transforms the physical parameters of toner particles through frictional heating, shear, sintering, coalescence, and fusion processes. This changes the particle size from fine powder (8-16 micrometers) to granules (0.1-2.0 mm), fundamentally improving handling properties while maintaining the desired plastomeric properties in the asphalt application

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent introduces intermediate substances including gelling clay, reactive agents, elastomers, functional fillers, and compatibilizers that act as mediators during the mixing and agglomerating process. These intermediaries facilitate the transformation of toner particles into handleable granules while ensuring proper integration with asphalt and maintaining the desired plastomeric properties

Inventive Principle:

Principle #24Intermediary (Mediator)

3Strength

If sufficient amount of unprocessed waste toner is added to achieve high-temperature benefits, then rutting resistance is improved, but the asphalt becomes more susceptible to freeze-thaw cracking

Engineering Contradiction:

Improverutting resistanceVSAvoidfreeze-thaw cracking susceptibility

Core Design Contradiction:

StrengthVSObject-affected harmful factors

Solution Approach 1:

The patent creates a composite additive combining toner with elastomers and other materials that provide both rigidity (for rutting resistance) and flexibility (for freeze-thaw resistance). The synergistic interaction between components allows the asphalt to resist both permanent deformation at high temperatures and thermal stress cracking at low temperatures

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent modifies the chemical composition and physical structure of the toner-based additive through controlled processing parameters including frictional heating, shear, sintering, coalescence, and fusion. These parameter changes create a material with balanced mechanical properties that simultaneously improve rutting resistance and reduce freeze-thaw cracking susceptibility

Inventive Principle:

Principle #35Parameter changes

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 modified toner-based additive enhances both high and low-temperature performance of asphalt, reducing cracking susceptibility and improving handling properties, while eliminating the need for on-site mixing and reducing human error.