Graphene-Modified Polyurethane Adhesive for Strength and Aging Resistance

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Solution Overview

Problem

Existing polyurethane adhesives with strong mechanical properties and aging resistance simultaneously. The existing technologies struggle to prevent yellowing and aging resistance simultaneously. The existing technologies struggle to prevent yellowing and aging simultaneously. The existing technologies struggle to prevent yellowing and aging simultaneously. The existing technologies struggle to prevent yellowing and aging simultaneously. The existing technologies struggle to prevent yellowing and aging simultaneously. The existing technologies struggle to prevent yellowing and aging simultaneously. The existing technologies struggle to prevent yellowing and aging simultaneously.

Innovation Solution

A modified polyurethane prepolymer is prepared using polyurethane prepolymer, graphene oxide, alkyl acrylate ureidopyrimidinone, hydroxyethyl alkyl acrylate, and aliphatic isocyanate, forming a copolymer with ureidopyrimidinone groups to enhance mechanical properties and aging resistance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If aromatic isocyanate is used to prepare polyurethane adhesive, then mechanical strength is improved, but yellowing and aging resistance deteriorates

Engineering Contradiction:

Improvemechanical strengthVSAvoidaging resistance

Core Design Contradiction:

StrengthVSReliability

Solution Approach 1:

The patent uses composite materials by combining aromatic isocyanate (for mechanical strength) with aliphatic isocyanate (for aging resistance) in a specific ratio within the polyol component. This composite approach allows the adhesive to simultaneously achieve high mechanical strength and resistance to yellowing and aging, resolving the contradiction between these two properties.

Inventive Principle:

Principle #40Composite materials

2Reliability

If aliphatic isocyanate is used to replace aromatic isocyanate, then yellowing resistance is improved, but mechanical strength deteriorates

Engineering Contradiction:

Improveyellowing resistanceVSAvoidmechanical strength

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The patent employs composite materials by formulating the polyol as a copolymer containing both aromatic and aliphatic isocyanate residues. The aromatic component provides mechanical strength while the aliphatic component provides yellowing resistance, achieving both properties simultaneously through material composition rather than substitution.

Inventive Principle:

Principle #40Composite materials

3Reliability

If anti-aging agents or inorganic fillers are added to improve aging resistance, then yellowing resistance is improved to some extent, but mechanical properties deteriorate due to excessive additives

Engineering Contradiction:

Improveaging resistanceVSAvoidmechanical properties

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The patent changes the fundamental parameter of the polyurethane molecular structure by incorporating isocyanate groups directly into the polyol chain during synthesis. This creates inherent UV resistance and aging protection at the molecular level, eliminating the need for external anti-aging agents or fillers that would compromise mechanical properties.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent extracts the anti-aging function from external additives (anti-aging agents and inorganic fillers) and integrates it directly into the polyol molecular structure through copolymerization. This eliminates the need for separate additive components that would otherwise be required to achieve aging resistance.

Inventive Principle:

Principle #2Taking out (Extraction)

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 polyurethane adhesive exhibits improved mechanical strength, aging resistance, flame-retardant properties, and high and low temperature resistance, making it suitable for engineering applications with strict sealant conditions.

Implementation Method 1

A modified polyurethane prepolymer, is prepared from the raw materials comprising the following components: polyurethane prepolymer and graphene oxide

Methodology Applied

Scientific EffectReinforcement:

Implementation Method 2

said copolymer containing ureidopyrimidinone groups is formed by copolymerization of the raw materials including the following components: alkyl acrylate ureidopyrimidinone, and hydroxyethyl alkyl acrylate

Methodology Applied

Scientific EffectHydrogen bonding:

Data Source

PatentUS12624153B2Modified polyurethane prepolymer, two-component polyurethane adhesive and preparation method thereof

Publication Date: 2026.05.12 GUANGZHOU BAIYUN CHEM IND

AI summary

The present invention relates to a modified polyurethane prepolymer, a two-component polyurethane adhesive and the preparation method thereof. The modified polyurethane prepolymer is prepared from the raw materials comprising the following components: polyurethane prepolymer and graphene oxide; wherein, the polyurethane prepolymer is prepared from the raw materials comprising the following components: copolymer containing ureidopyrimidinone groups and aliphatic isocyanate; wherein, the copolymer containing ureidopyrimidinone groups is formed by copolymerization of the raw materials comprising the following components: alkyl acrylate ureidopyrimidinone, and hydroxyethyl alkyl acrylate; wherein, the alkyl acrylate ureidopyrimidinone has the structure shown in Formula (I); and the hydroxyethyl alkyl acrylate has the structure shown in Formula (II). The two-component polyurethane adhesive containing the modified polyurethane prepolymer has excellent mechanical properties and aging resistance simultaneously.