By John Comyn
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Extra resources for Adhesion Science
F) Bonding should take place within 8 h. It is multi-stage, requires careful control and uses chemicals which are hazardous to both the person and the environment. It is only used for making expensive products such as aircraft and racing cars. Rinsing in tap water, rather than deionized or distilled water gives more durable joints. A recommended procedure for mild steel is as follows: Remove rust or millscale by brushing. Vapour degrease. Grit-blast. Etch in 4% solution of hydrofluoric acid at room temperature for 10 min.
Primers based on chlorinated rubber seem to be chemisorbed to some oxide surfaces. Examples of some commercial primers for structural adhesives are as follows; it may be noted that they are made for specific adhesives, have recommended coating thicknesses, and generally require curing at elevated temperatures. Cyanamid BR 127. This is particularly recommended for use with FM373 toughened epoxy film adhesive. 0 pm, After drying in air for 30 min the primed surface is cured for 30min at 120 6 "C; it then has an indefinite shelf-life.
When the adhesives cure, the rubber precipitates as droplets about 1 pm diameter, the driving force for this being the incompatibility that generally occurs between polymers. Adhesive joints break by the growth of a crack, and rubber particles act as crack stoppers. Fracture energies and impact strengths are increased. 7. As two neighbouring hydroxyl groups are consumed in these reactions, some isolated hydroxyl groups will remain. PVB is widely used as the interlayer in laminated glass. 7 dioxide and chlorine.