The Secret Formula Behind Every Rock Solid Bond- Epoxy Adhesives

1. The Secret Formula Behind Every Rock Solid Bond- Epoxy Adhesives Have you ever wondered what is it that holds the small components in huge infrastructures found in the automobile, shipbuilding, aerospace and construction industries? It is none other than the epoxy adhesives which when used in even small amounts help in holding and keeping each and every small part together. What is the secret formula that goes into the creation of epoxy adhesives leading to rock solid bonds in most of the industries? Knowing more about epoxy adhesives The secret of epoxy adhesives creating a strong bond with the substrate lies in its chemical reaction with the curing agent. When one part of the adhesive is mixed with one part of what is called as the hardener, a chemical reaction takes place. This leads to the creation of cross-linked polymer chains. These chains are responsible for forming a rock solid bond with the substrate it adheres to due to their locking at the molecular level. This entire procedure is known as polymerization. The process can be explained through the following steps: Occurrence of chemical reaction The secret as mentioned above is the occurrence of chemical reaction between the hardener and the resin inducing the adhesive to work and form a strong bond. This tough chemical bond between the resin and substrate molecules takes place after the curing process. The occurrence of this chemical reaction is majorly responsible for the reliability and toughness of the adhesive. Cross-linking The occurrence of cross-linking leads to creation of interconnected polymer chains that are responsible for forming a very tough structure. Surface adhesion Tough chemical bonds are formed between the epoxy molecules and the surface molecules and this further increases the bond toughness. The irregularities and tiny pores in the surface of the material to which it is adhered to lets the epoxy to flow thus leading to mechanical interlocking in the seams which in turn heightens their strength. What are the factors that determine the strength of the epoxy bond? There are however, several factors that determine the solidness of the epoxy adhesives. Mixing ratio The mix ratio of the resin and hardener is a determining factor. It has to be properly measured as even a miniscule variation in the given measurement can have an adverse effect on the curing efficiency of the adhesive and consequently the resulting bond strength. Curing temperature The curing temperature is another deciding factor. Though epoxy adhesives do their work even at room temperatures, curing is enhanced by heating leading to the subsequent bond. Preparation of the surface

2. It is essential for the surface to be prepared according to the rule. Proper scrubbing is necessary for ensuring the cleanliness of the surface and subsequently it has to be dried well. In some cases, mechanical roughing is done to get the required bonded surfaces. On a summarizing note Epoxy adhesives have become an integral part of our everyday life. We cannot imagine a world without these adhesives. The above brief gives a peek into the secret formula responsible for their working!