Adhesive
What is Adhesion?
Bonding is the process of joining two similar or dissimilar solids by introducing a substance.
This substance is called an adhesive, and the solid being bonded is called an adherend. The difference from bonding is that wetting occurs.
Wetting
A phenomenon that occurs when the adhesive and adherend exhibit similar properties.
Water and oil do not mix because they are not similar to each other.
All types of adhesives are liquid when applied.
This provides fluidity and allows the adhesive to penetrate every nook and cranny of the adherend.
What is Adhesive?
Any substance that causes adhesion. Depending on the main ingredient, they can be divided into organic and inorganic adhesives. Organic adhesives are further classified into natural and synthetic adhesives. In addition, depending on the curing method, they are classified into room-temperature curing adhesives and melt-curing adhesives, and there are also heat-curing and tack-type adhesives.
Adhesion Path
The process by which the adhesive and adherend become a single substance
Contact
Wetting
Bonding
Maintenance (Adhesion generation)
Contact |
The first contact between the applied adhesive and the adherend for adhesion |
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Wetting |
The corresponding phase between the adhesive and the substrate. |
Bonding |
Provides factors that generate adhesive strength, including mechanical adhesion development stages such as anchors, zippers, and capillary phenomena, and chemical adhesion development. |
Maintence |
A phenomenon in which an adhesive state is maintained without deformation by a constant external force. |
What is a Suitable Adhesive?
All adhesion paths (contact-wetting-bonding-maintenance) must be satisfied.
It must be in harmony with workability - it is related to productivity.
Criteria for selecting appropriate adhesives |
Adhesion Disruption Factor |
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Criteria for Selecting Appropriate Adhesives What type of object for adhesion? What will you use it for? What are the conditions of the joint (temperature, humidity, moisture content, contamination, etc.)? How to apply? What is the shape of the joint? Are the working conditions and machines used appropriate? Selected |
Adhesion Disruption Factor Surface problems of the object for adhesion Adhesive Selection Issues Deformation of the object for adhesion - distortion, shrinkage, expansion, etc. Problems with how to work and how to use |