8 сентября, 2015 
Malyar Richard D. Rich
Loctite Corporation, Rocky Hill, Connecticut, U. S.A.
Anaerobic adhesives are mixtures of acrylic esters that remain liquid when exposed to air but harden when confined between metal surfaces. These mixtures can be used for a large number of industrial purposes, such as locking threaded fasteners, sealing threaded pipe connections, retaining cylindrical machine components, sealing flange joints, bonding structural components, sealing porous metal castings, welds and powdered metal parts, and many other applications that are still being found more than 50 years after the initial invention [1]. Several reviews have been published that describe anaerobic adhesives and their applications [2-6].
The first anaerobic adhesives were made at the General Electric Company by aeration of a polyethylene glycol dimethacrylate. This ‘‘Anaerobic Permafil’’ required continuous aeration to prevent hardening [7]. Although a number of internal applications had been identified, the problems associated with shipping and storage made the product so impractical that the company decided to discontinue its manufacture.
Vernon Krieble, chairman of the Chemistry Department at Trinity College in Hartford, Connecticut, learned about the product through his son, Robert Krieble, who was employed at General Electric. Vernon Krieble found a chemical solution to the problem by using cumene hydroperoxide (I) (see Section XII for all structures) as the initiator and packaging in half-filled oxygen-permeable polyethylene bottles [8]. He licensed the GE patent and in 1954 founded the American Sealants Corporation, which later became Loctite Corporation [9]. At the present time anaerobic adhesives and sealants are manufactured or sold on every continent by more than a dozen companies. Applications in virtually every industry, and technological innovation, as measured by patent activity, continue unabated.
Опубликовано в рубрике 