Adhesives Handbook by J. Shields (Auth.)

Chemical Engineering

By J. Shields (Auth.)

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Acids, bases, salts, sulphur compounds and perox30 ides are commonly used and, unlike hardeners, only small quantities are required to effect curing. The amount of catalyst is critical and poor bond strengths result where resins are over or under catalysed. Accelerators, inhibitors and retarders These substances control the curing rate. An accelerator is a substance that speeds up curing caused by a catalyst by combining with the binder (a catalyst may have the same effect but will not lose its chemical identity during the process).

Adhesives can be formulated to be electrically and/or thermally con- ADHESIVE SELECTION ductive by compounding with suitable filler materials. It should be noted that the surface pretreatment given to adherends prior to bonding frequently affects the electrical and thermal properties of the bond. Optical properties Transparent, colourless glue-lines of a given refractive index are usually required for optical systems. ) as a result of the excessive shrinkage of an adhesive on curing. Where colour is important, the adhesives can be tinted with dyes and pigments.

It has already been noted earlier that adhesives based on the same material may show considerable variation in their properties where modifying materials have been added to the formulation. Properties are dependent, not only on the adhesive composition, but also on the conditions under which it is prepared and used. Because of these possible variations any values given in this section should be regarded as representative of the probable behaviour of a basic type of material used under certain conditions.

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