Preparation of steel surfaces for adhesive bonding by etching wi

Adhesive bonding and miscellaneous chemical manufacture – Delaminating processes adapted for specified product – Delaminating in preparation for post processing recycling step

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134 3, 156330, 156664, 252136, 252 794, C23F 100, B32B 3124

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active

044103930

ABSTRACT:
The invention provides a process and composition for preparing steel surfaces for adhesive bonding. The process involves contacting the steel article with an etchant composition containing phosphoric acid and a liquid polyhydric alcohol such as propylene glycol, diethylene glycol or glycerine. The process produces steel surfaces, which when adhesively bonded yield joints much stronger than those obtained by abrasive blasting, and comparable to those obtained by use of phosphoric acid-ethanol etchant compositions without the hazards of the latter.

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patent: 3979238 (1976-09-01), Justice
"Glycerol", Kirk-Othmer Encyclopedia of Chemical Tech., John Wiley & Sons, nc., vol. 10, pp. 619, 620, 629.

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