Two-Part Cyanoacrylate Adhesive Composition for Fast Durable Bonding

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Solution Overview

Problem

Existing cyanoacrylate adhesives face challenges with durability under elevated temperatures and high humidity, and (meth)acrylate adhesives have issues with odor and flammability, while achieving fast bonding and strong adhesion across various substrates remains a challenge.

Innovation Solution

A two-part cyanoacrylate/free radically curable composition comprising ethyl-2-cyanoacrylate, a peroxide catalyst, and a free radical curable component with maleimide-, itaconamide-, or nadimide-containing compounds, along with benzoylthiourea or benzoylthiourethane derivatives, to enhance bonding strength and durability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If cyanoacrylate adhesive is used for fast bonding, then bonding speed is improved, but durability under elevated temperature and high humidity deteriorates

Engineering Contradiction:

Improvebonding speedVSAvoiddurability under elevated temperature and high humidity

Core Design Contradiction:

SpeedVSReliability

Solution Approach 1:

The patent combines cyanoacrylate adhesive with a free radically curable component (such as (meth)acrylate, vinyl ester, or epoxy resin) to create a composite adhesive system. This composite approach allows the cyanoacrylate to provide rapid initial bonding while the free radically curable component cures to provide enhanced durability and resistance to temperature and humidity conditions.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent modifies the chemical composition parameters of the adhesive system by incorporating specific ratios of cyanoacrylate to free radically curable components, and by selecting particular types of free radically curable components (vinyl esters with 20-50 carbon atoms, (meth)acrylates with specific molecular weights, etc.) to optimize both bonding speed and durability under various environmental conditions.

Inventive Principle:

Principle #35Parameter changes

2Strength

If (meth)acrylate adhesive is used to improve adhesion, then bonding strength is improved, but odor and flammability increase

Engineering Contradiction:

Improvebonding strengthVSAvoidodor and flammability

Core Design Contradiction:

StrengthVSObject-generated harmful factors

Solution Approach 1:

The patent selects free radically curable components with specific molecular weight ranges and chemical structures (vinyl esters with 20-50 carbon atoms, (meth)acrylates with controlled molecular weights) that balance bonding strength requirements while reducing volatility and flammability compared to conventional low molecular weight (meth)acrylates.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs vinyl esters and other free radically curable components that can be applied in controlled amounts and cure completely to form durable bonds, eliminating the need for continuous presence of reactive monomers that cause odor and flammability hazards.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

3Strength

If free radical curable component is added to improve adhesion, then bonding strength is improved, but curing time increases

Engineering Contradiction:

Improvebonding strengthVSAvoidcuring time

Core Design Contradiction:

StrengthVSLoss of time

Solution Approach 1:

The cyanoacrylate component provides preliminary bonding action immediately upon application, holding substrates in place while the free radically curable component cures. This preliminary action allows the system to achieve handling strength quickly while the secondary component provides long-term durability.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The curing process occurs in stages: first the cyanoacrylate provides rapid initial set (seconds to minutes), then the free radically curable component continues to cure over a longer period (hours to days) to achieve full strength and durability, creating a multi-phase curing timeline that balances speed and strength.

Inventive Principle:

Principle #19Periodic action

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 composition provides improved bond strength, durability, and reduced odor and flammability, enabling fast bonding across a wide range of substrates without compromising shelf-life stability.

Implementation Method 1

a free radical curable component, curable by a peroxide catalyst, selected from a (meth)acrylate component, maleimide-, itaconamide- or nadimide-containing compounds, and combinations thereof

Methodology Applied

Scientific EffectFree radical polymerization: Photopolymerisation

Implementation Method 2

Polymerization of cyanoacrylates is initiated by nucleophiles found under normal atmospheric conditions on most surfaces. The initiation by surface chemistry means that sufficient initiating species are available when two surfaces are in close contact with a small layer of cyanoacrylate between the two surfaces.

Methodology Applied

Scientific EffectAnionic polymerization: