Chapter 1


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about adhesive

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Chapter 1

  1. 1. CHAPTER 1 INTRODUCTION TO ADHESIVE By Nur Isfarina binti Ismail
  2. 2. ADHESIVE  A mixture in liquid/ semiliquid that used to bond two item together by adhesion to surface attachment.  From synthetic or natural.  Required control temperature to cure.
  3. 3. TERMINOLOGY  ADHESIVE : Substances that liquid/semiliquid that used to bond 2 or more substrate by surface attachment.  GLUE : refer to adhesive that source from hard gelatine.  RESIN : solid, liquid or semiliquid synthetic organic polymer uses as basis of adhesive, hardener or etc.  ADHESION : a process that held 2 or more material using adhesive.
  4. 4. CONTINUE..  ADHESIVE BONDING: method used to joined 2 or more material using adhesive.  ADHEREND : a material that will held together using adhesive.  ABHESION : condition that having minimal adhesion  COHESION : single substances/ adhesive held together by primary a secondary valence forces.
  5. 5. CONTINUE..  PRACTICAL ADHESION: measure physical strength of adhesive bond.  INTRINSIC ADHESION: molecular forces of attraction between liquid and solid.  BINDER : component of adhesive composition that responsible for adhesive forces.  HARDENER: substances that added into adhesive to control curing.
  6. 6. CONTINUE..  SOLID CONTENT: percentage of non-volatile in adhesion.  SHELF TIME: maximum time the adhesive can be stored.  GLUE SPREAD: amount of glue applies in wood surface.  VISCOSITY: the level of consistency in adhesive; either very liquid and easy to flow or very thick and difficult to flow.
  7. 7. CONTINUE..  INTRINSIC BONDING: molecular forces that attraction between the adhesive and substrate.  GAPS FILLING PROPERTIES: ability of glue to fill the gaps of joint.  GEL TIME: required time for adhesive to become gel.  ASSEMBLE : the time between spreading adhesive until it be pressed/heated.
  8. 8. CONTINUE..  INTERFACE: a point where 2 things meet in interact at the surface.  GLUELINE: where the adhesion takes place.  BONDING STRENGHT: the strength of bonding material.
  9. 9. IMPORTANT FACTOR IN SELECTING GLUE  STRENGHT - high strength in timber joint.  COST - cost of adhesive  APPLICATION - ease of application  RESISTANT - resistant to moisture and heat  COLOR - colour depend on strength and type of adhesive
  10. 10. PROPERTIES OF ADHESIVE AFFECT STRENGTH OF ADHESION  FEATURES: solid, semi-solid or liquid  SPREAD: ability to spread and flow  PENETRATE: ability to penetrate in adherent  COVER: ability to displace most contiminant surface  CURED: become solid when it cured
  11. 11. ADVANTAGES  Can combined small particles.  Glueline provide and act as electrical insulator.  Prevent metal from corrosion.  Low cost than fastener.  Can joint other material (plastic + wood).
  12. 12. DISADVANTAGES  Required special surface treatment.  Bonding can induce other failure.  Low shelf time.  Difficulty to predict durability.  Sometimes more expensive from fastener.