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Adhesives and Sealants TopicsFinished Adhesives and SealantsRaw Materials and Chemicals

Ask Dr. Dave

What can I use as an adhesion promoter to a ceramic surface?

Dr. Dave discusses promoting adhesion on ceramic surfaces, as well as curing considerations for anaerobic adhesives.

By Dave Dunn Ph.D.
Dr. Dave
March 16, 2020

You don’t mention your specific adhesive or sealant material, but in general, a ceramic surface tends to behave similarly to a glass surface. Silane adhesion promoters, such as epoxy functional or vinyl functional materials, are often effective here. Tetraethyl silicate solutions have also been used.
 

We sell an anaerobic adhesive for several metal bonding applications, but some customers ask for a system that can also be cured quickly with heat. Do you have any recommendations?

Most anaerobic adhesives will cure much faster with heat, but you will probably still be talking about 1-2 hrs for full cure. If really fast cures are required, then think about adding an azo initiator in small amounts (less than 1%). The adhesives will cure in a few minutes at about 100˚C. The great thing about azo initiators is that they do not react with virtually any other chemical, but merely produce free radicals on heating. Thus they will not interfere with your anaerobic cure system or cause shelf life problems. 

Be careful about any excess free radical stabilizers in the system, which might slow down the curing. Also, check the cured properties of the adhesive because the change in cure system might affect the molecular weight of the cured polymer.


Any views or opinions expressed in this column are those of the author and do not represent those of ASI, its staff, Editorial Advisory Board or BNP Media. 

 

KEYWORDS: additives bonding epoxies

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Dave dunn

Ask Dr. Dave is written by Dave Dunn, Ph.D., of F.L.D. Enterprises, a technical consultancy and full-service industrial market-research firm specializing in the adhesives, sealants, specialty rubbers and plastics fields. Dave is a former vice president and director of Loctite Corp. and has spent many years in troubleshooting adhesive and sealant problems. Questions for publication should be directed to him at 242 Trails End, Aurora OH 44202; phone (440) 477-5164; fax (330) 247-1690; or email DrDave242@windstream.net .

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