Aminated Phosphorene Polyurethane Coating for VOC-Free Flame Retardancy

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Solution Overview

Problem

Existing solvent-based flame-retardant coatings pose environmental risks due to VOC emissions and flammability, while existing waterborne coatings lack sufficient flame-retardant performance.

Innovation Solution

Aminated phosphorene-based flame-retardant waterborne polyurethane coating is prepared using a diisocyanate-terminated prepolymer, neutralizer, and aminated phosphorene, synthesized through specific molar ratios and reaction steps, introducing black phosphorous for enhanced flame retardancy without organic solvents.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If solvent-based flame-retardant coatings are used, then flame-retardant performance is improved, but environmental pollution and flammability risk increase

Engineering Contradiction:

Improveflame-retardant performanceVSAvoidVOC emissions and flammability risk

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent changes the solvent parameter from organic solvent to water, transforming the coating system from solvent-based to waterborne. This parameter change eliminates VOC emissions and reduces flammability risk while maintaining flame-retardant performance through the phosphorus-containing polyurethane resin formulation

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent uses composite materials by combining phosphorus-containing polyurethane resin with waterborne modification agents and flame-retardant additives. This composite approach creates a waterborne coating system that achieves both environmental friendliness and effective flame retardancy

Inventive Principle:

Principle #40Composite materials

2Object-affected harmful factors

If waterborne coatings are used, then environmental protection is improved, but flame-retardant performance deteriorates

Engineering Contradiction:

ImproveVOC emissionsVSAvoidflame-retardant performance

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The patent introduces phosphorus-containing polyurethane resin as an intermediary substance that bridges the gap between waterborne coating requirements and flame-retardant performance. The phosphorus-containing monomer serves as a mediator that enables both water solubility and flame-retardant functionality in the same polymer system

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent applies local quality by concentrating flame-retardant phosphorus groups specifically within the polyurethane resin molecular structure. This localized placement of flame-retardant functionality ensures effective fire protection while the overall waterborne formulation maintains environmental friendliness

Inventive Principle:

Principle #3Local quality

3Reliability

If flame retardant agent is blended into material, then flame-retardant performance is improved, but mechanical properties deteriorate

Engineering Contradiction:

Improveflame-retardant performanceVSAvoidtensile modulus and elastic modulus

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The patent merges the flame-retardant function with the coating matrix by incorporating phosphorus-containing groups directly into the polyurethane resin molecular structure. This merging eliminates the need for separate flame-retardant additives that would compromise mechanical properties, as the flame-retardant functionality becomes an integral part of the coating system

Inventive Principle:

Principle #5Merging (Combining)

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 coating achieves VO-grade fire-retardant effect, eliminating flammability risks and meeting environmental protection requirements, with improved thermal barrier and radical capture mechanisms.

Implementation Method 1

a phosphorus-containing monomer is adopted to synthesize a polyurethane resin containing a flame-retardant element phosphorus on the molecular chain

Methodology Applied

Scientific EffectPolymerization: Photopolymerisation

Implementation Method 2

the phosphorus-containing polyurethane resin is subjected to water-borne modification

Methodology Applied

Scientific EffectEmulsion formation: Emulsion

Implementation Method 3

The prepared phosphorus-containing waterborne transparent fireproof polyurethane coating meets the requirements of environmental protection and is not flammable and explosive

Methodology Applied

Scientific EffectThermal insulation: Thermal Insulation

Implementation Method 4

a phosphorus-containing monomer is adopted to synthesize a polyurethane resin containing a flame-retardant element phosphorus on the molecular chain

Methodology Applied

Scientific EffectChemical reaction: Chemical Bonding

Data Source

PatentUS12480019B2Aminated phosphorene-based flame-retardant waterborne polyurethane coating and preparation method thereof

Publication Date: 2025.11.25 GUANGDONG HERUN PRECISION METAL MATERIALS CO LTD

AI summary

This application relates to flame-retardant coatings, and more particularly to an aminated phosphorene-based flame-retardant waterborne polyurethane coating and a preparation method thereof. The aminated phosphorene-based flame-retardant waterborne polyurethane coating is prepared from a diisocyanate-terminated prepolymer, a neutralizer and an aminated phosphorene, where the diisocyanate-terminated prepolymer is prepared from polymeric diol with water-dispersible groups, aliphatic diisocyanate and carboxylic acid type hydrophilic diol under the catalysis of a catalyst for synthesizing waterborne polyurethane.