Hydrophobically Modified Clay for Solvent-Safe Exfoliation Transfer

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Solution Overview

Problem

Existing methods for transferring exfoliated clay particles from aqueous suspensions to hydrophobic polymer matrices result in the collapse of the exfoliated state due to the use of solvents like acetonitrile, which are costly, hazardous, and require additional combustion processes, posing risks of toxic substance formation.

Innovation Solution

Modify the surface of laminated clay minerals with quaternary ammonium-based compounds having a specific ratio of apolar/polar substituents on the nitrogen atom, allowing for complete exfoliation in organic solvents other than acetonitrile, thereby retaining the exfoliated state during transfer.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If acetonitrile is used to transfer exfoliated clay particles from aqueous suspension to polymer matrix, then complete exfoliation is achieved, but the process becomes costly and hazardous requiring combustion processes

Engineering Contradiction:

Improveexfoliation completenessVSAvoidtoxic substance formation risk

Core Design Contradiction:

Manufacturing precisionVSObject-affected harmful factors

Solution Approach 1:

The patent changes the chemical parameter of the solvent system by replacing acetonitrile with alternative organic solvents (such as esters, ketones, or hydrocarbons) that do not require combustion for removal. This parameter change maintains the exfoliation effectiveness while eliminating the harmful combustion process and associated toxic substance formation risks.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs volatile organic solvents that can be easily evaporated without combustion, replacing the need for energy-intensive combustion processes. These solvents serve their purpose of transferring exfoliated particles and then can be removed simply through evaporation, reducing both cost and environmental hazard.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

2Manufacturing precision

If acetonitrile is used for transferring exfoliated clay particles, then complete exfoliation is achieved, but the process becomes more expensive compared to common solvents

Engineering Contradiction:

Improveexfoliation completenessVSAvoidmanufacturing cost

Core Design Contradiction:

Manufacturing precisionVSEase of manufacture

Solution Approach 1:

The patent changes the economic parameter by selecting alternative organic solvents with lower costs than acetonitrile. Solvents such as ethyl acetate, butyl acetate, or other common organic solvents are substituted for acetonitrile, maintaining the exfoliation effectiveness while significantly reducing the manufacturing cost.

Inventive Principle:

Principle #35Parameter changes

3Loss of substance

If acetonitrile-based formulations are combusted for solvent removal, then solvent is eliminated, but nitrous oxides and potentially hydrogen cyanide are formed

Engineering Contradiction:

Improvesolvent removalVSAvoidnitrous oxide and hydrogen cyanide formation

Core Design Contradiction:

Loss of substanceVSObject-generated harmful factors

Solution Approach 1:

The patent employs volatile organic solvents that can be easily evaporated without combustion, replacing the need for combustion processes. These solvents serve their purpose of transferring exfoliated particles and then can be removed simply through evaporation, reducing both cost and environmental hazard.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

Solution Approach 2:

The patent converts the previously harmful combustion process into a beneficial simple evaporation process by selecting solvents with appropriate volatility. The solvent removal step becomes advantageous rather than harmful, eliminating the formation of toxic combustion products while effectively removing the solvent.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

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 clay particles maintain their exfoliated state in organic solvents, enhancing gas barrier properties and mechanical/thermal properties in polymeric compositions, such as coatings, sealants, and adhesives, without the hazards and costs associated with acetonitrile.

Implementation Method 1

the at least one clay modifying agent is able to substantially replace the first cation on the clay surface

Methodology Applied

Scientific EffectIon exchange: Ion Exchange

Implementation Method 2

The aspect ratios of laminated clay particles may be maximized by osmotic swelling. Osmotic swelling occurs in aqueous suspensions

Methodology Applied

Scientific EffectOsmotic swelling: Osmosis

Data Source

PatentEP3500625B1Method for preparing a hydrophobically modified clay

Publication Date: 2026.03.04 HENKEL KGAA

AI summary

The invention relates to a method for preparing a hydrophobically modified clay, wherein the clay modifying agent corresponds to a quaternary ammonium based compound. The present invention further relates to a hydrophobically modified clay obtainable by such a method and to a suspension comprising such a clay, as well to the use of such a hydrophobically modified clay and of a suspension comprising such a hydrophobically modified clay. Furthermore, the present invention is also directed to a polymeric composition comprising a hydrophobically modified clay and/or a suspension comprising a hydrophobically modified clay.