By John Comyn
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Extra resources for Adhesion Science , 1st Edition
1, where n is ca. 2. The pure compound is a solid but the commercial product is, more conveniently, a liquid. 2. 2) Tetraglycidyl diarninodiphenylmethane Both aromatic and aliphatic amines are used as hardeners, and the stoichiometry is that one epoxide ring will react with one aminehydrogen atom in a condensation polymerization. 2. 2 Reaction of primary amine with 2 epoxide groups. 4). 3. Such compounds are often known as Versamids. 3 temperature or the process can be accelerated b heating. Typical c re times are 14 h at room temperature or 3 h at 80 "C.
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.
Joints prepared with an acid etch are the most durable and those with solvent degrease are least. Resistance to water is much improved if aluminium surfaces are treated, prior to bonding, by etching or anodizing. Aluminium and its alloys can be etched in chromic-sulfuric or phosphoric acids. A procedure recommended by Ciba Composites is shown below. g. for 10 min in an aqueous solution of Turco T 5215 at 70 "C, followed by a spray rinse in clean water. Etch in chromium trioxide 250 g (or sodium dichromate 375 g), concentrated sulfuric acid 750 ml and water to 5 1, at 60-65 "C for 30 min.