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Adhesives.org BLOG: What if the Adhesive was Part of the Substrate in the First Place?

Posted By ASC, Friday, April 6, 2018

BLOG:  What if the Adhesive was Part of the Substrate in the First Place?
 
By Dr. Cynthia Gosselin (guest blogger)

My last blog post focused on providing the automotive industry with a way to obtain a pristine metal surface for adhesive bonding and painting by coating coils with a thin film acrylic that could be easily removed during the standard alkaline cleaning process. Prior to removal, the coating protected the surface from soils that, if not properly removed, could inhibit adhesive, sealant and paint adhesion and/or field durability. Taking this concept one step further, what if the adhesive was actually part of the substrate in the first place?

There were (and still are) applications dating back to the late 1970’s wherein adhesives were successfully applied to coils in automotive applications. One example is the use of phenolic adhesives on steel for transmission rings. In this case, these coated substrates not only had to withstand a flat stamping operation but subsequently had to bond the transmission rings to specialized papers using induction heating. The B-staged strong (albeit brittle phenolic) adhesive was a good fit because the coated system did not undergo a forming or drawing (i.e. stretching) operation. The advantage of this product was that the pretreatment and adhesive application was uniform on both sides across the entire width of the strip and the B-staged cure was consistent. An added advantage was that coil-coated pretreatment is specially formulated to provide excellent cut edge corrosion protection.

Another successful example of adhesive-coated steel is currently in use for automotive trim. The substrate is generally bright-annealed Type 304 stainless steel which does not inherently exhibit good adhesion characteristics without specialized surface preparation. In this case, the stainless steel is pretreated and primed and the adhesive is applied on thin-width coils. This formable two-coat system improves...

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