Furfuryl Alcohol Mannich Base Curatives With Lower Toxicity

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Solution Overview

Problem

There is a need for alternative Mannich bases that offer high process performance, broad compatibility with epoxy resins, and avoid the toxicity and environmental issues associated with known amine-derived epoxy resin curatives.

Innovation Solution

A new class of Mannich base derived from furfuryl alcohol, polyfurfuryl alcohol, and/or a co-polymer of furfuryl alcohol is developed, which is prepared by contacting these compounds with primary or secondary monoamines and/or polyamines, optionally with an aldehyde, to form a Mannich base suitable as an epoxy resin curative.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If phenolic derived Mannich base curing agents are used, then epoxy resin curing performance is improved, but toxicity and environmental issues worsen

Engineering Contradiction:

Improvecuring performanceVSAvoidtoxicity

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The invention changes the chemical composition parameters of the Mannich base by replacing phenolic compounds with furfuryl alcohol derivatives. This substitution maintains the curing functionality while eliminating the toxic properties associated with phenolic compounds, directly resolving the contradiction between curing performance and toxicity

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention uses readily available furfuryl alcohol and its polymers as starting materials that can be easily converted into effective curing agents. These bio-based materials provide a sustainable, non-toxic alternative to persistent phenolic compounds, addressing both performance and environmental concerns

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

2Ease of operation

If butyraldehyde is used in Mannich base preparation, then viscosity is reduced, but molecular weight control and residual phenol levels worsen

Engineering Contradiction:

ImproveviscosityVSAvoidmolecular weight and residual phenol levels

Core Design Contradiction:

Ease of operationVSManufacturing precision

Solution Approach 1:

The invention extracts and eliminates the problematic phenolic component from the Mannich base system entirely by using furfuryl alcohol derivatives instead. This removal of the harmful phenol monomer source directly addresses the residual phenol level issue while maintaining the low viscosity benefits of using aldehyde-based Mannich bases

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The invention changes the starting material parameters from phenolic compounds to furfuryl alcohol derivatives, which fundamentally alters the molecular structure and properties of the resulting Mannich base. This parameter change enables better control over molecular weight and eliminates residual phenol concerns while maintaining acceptable viscosity

Inventive Principle:

Principle #35Parameter changes

3Object-affected harmful factors

If renewable biomass sources are used to derive Mannich base, then environmental friendliness is improved, but process performance may worsen

Engineering Contradiction:

Improveenvironmental impactVSAvoidprocess performance

Core Design Contradiction:

Object-affected harmful factorsVSProductivity

Solution Approach 1:

The invention demonstrates that furfuryl alcohol and its polymers can serve multiple functions: they act as both the phenolic equivalent in the Mannich base reaction and as the primary structural component of the curing agent. This multi-functionality of the bio-based material ensures that environmental friendliness does not come at the cost of process performance

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The furfuryl alcohol derivative itself provides all the necessary functional groups and structural characteristics needed for effective epoxy curing. The bio-based material is self-sufficient in delivering both environmental benefits and adequate process performance without requiring additional modifiers or compromises

Inventive Principle:

Principle #25Self-service

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 resulting Mannich base provides high bio-derived content with low or no residual toxic materials, offering desirable cured epoxy performance, including chemical resistance, and is prepared using renewable biomass sources, reducing reliance on phenol-derived curatives and lowering hazard ratings.

Implementation Method 1

contacting a) furfuryl alcohol, polyfurfuryl alcohol, and/or a co-polymer of furfuryl alcohol with b) a primary or secondary monoamine and/or a polyamine comprising primary and/or secondary amino groups; and obtaining a Mannich base

Methodology Applied

Scientific EffectMannich reaction: Chemical Bonding

Data Source

PatentUS12522689B2Mannich base epoxy curative, cured epoxy resins thereof and methods of preparing the same

Publication Date: 2026.01.13 JONES PAUL

AI summary

The invention relates to a Mannich base useful as an epoxy curative agent. In particular, the present invention is directed to a Mannich base derived from furfuryl alcohol, or a homopolymer or co-polymer thereof, an epoxy resin curative composition comprising the Mannich base, a cured epoxy resin obtainable using the composition, processes for preparing the Mannich base and uses thereof. An example of a Mannich base derived from furfuryl alcohol in accordance with the present invention is shown below (Structure I):