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The principle of adhesive bonding

MindMap Gallery The principle of adhesive bonding

The principle of adhesive bonding

The principle of adhesive bonding involves types of adhesives, surface preparation, and bond strength and durability. Types include epoxy, cyanoacrylate, polyurethane, silicone, and hot melt. Surface preparation involves cleaning, degreasing, and sometimes primer application. Bond strength and durability are influenced by adhesive type, substrate material, surface preparation, and environmental conditions.

Edited at 2024-12-17 01:48:20

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The principle of adhesive bonding

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Outline

The principle of adhesive bonding

Definition of adhesive bonding

Process of joining materials

Using an adhesive

Viscous substance

Creates bond between surfaces

Through adhesion and cohesion

Adhesion

Attraction between adhesive and adherend

Cohesion

Internal strength of adhesive

Different from other joining methods

No need for fasteners

No thermal distortion

Types of adhesives

Based on chemical composition

Organic adhesives

Natural polymers

Proteinbased (casein, animal glues)

Vegetablebased (starch, dextrin)

Synthetic polymers

Thermoplastics (polyvinyl acetate)

Thermosets (epoxies, phenolics)

Inorganic adhesives

Ceramicbased (cement, plaster)

Metallicbased (solder, brazing alloys)

Based on setting mechanism

Physical setting adhesives

Evaporation of solvent

Cooling from molten state

Chemical setting adhesives

Polymerization

Polycondensation

Surface preparation

Importance of clean surfaces

Removal of contaminants

Dirt

Oxides

Surface activation

Mechanical abrasion

Chemical etching

Surface energy considerations

High surface energy materials

Easier to bond

Low surface energy materials

Require special adhesives

Adhesive application

Techniques

Brushing

Rolling

Spraying

Factors affecting application

Consistency of adhesive

Thickness of bond line

Curing and setting

Time required for curing

Depends on adhesive type

Fastcuring adhesives

Slowcuring adhesives

Environmental conditions

Temperature

Humidity

Mechanisms of curing

Evaporation of solvents

Chemical reactions

Crosslinking

Polymerization

Bond strength and durability

Factors affecting bond strength

Adhesive properties

Viscosity

Elasticity

Adherend properties

Surface roughness

Material type

Environmental factors

Temperature changes

Humidity

UV exposure

Applications of adhesive bonding

Industry sectors

Automotive

Body assembly

Interior components

Aerospace

Composite materials

Structural bonding

Construction

Flooring

Wall panels

Medical

Implants

Wound closure

Advantages over traditional methods

Lightweight construction

Seamless joints

Fatigue resistance

Challenges and limitations

Adhesive selection

Matching adhesive to application

Bonding failures

Poor surface preparation

Incompatible materials

Cost considerations

Initial cost of adhesives

Complexity of application process

Environmental concerns

Disposal of used adhesives

Toxicity of certain adhesives